Method and device for determining flue gas emission loss of oxygen-enriched combustion boiler

Abstract

The application provides a method and device for determining the exhaust loss of an oxygen-enriched combustion boiler, and relates to the technical field of boiler exhaust loss determination. The method comprises the following steps: obtaining the exhaust loss of unit mass of received base coal, the amount of condensed water vapor, the total air leakage of the boiler, the oxygen injection amount, the water vapor concentration at the outlet of the air preheater and the amount of recirculated flue gas according to the received base coal parameters, the oxygen injection parameters, the flue gas recirculation extraction point parameters, the air preheater extraction point parameters and the atmospheric parameters; and then obtaining the exhaust loss of the oxygen-enriched combustion boiler according to the above variables, the specific heat capacity parameters and the combustion parameters. The application can make the determination of the exhaust loss of the oxygen-enriched combustion boiler feasible, and the number of devices required for determining the exhaust loss of the oxygen-enriched combustion boiler is small, thereby effectively reducing the cost of determining the exhaust loss of the oxygen-enriched combustion boiler.

Description

Technical Field

[0001] This invention relates to the technical field of boiler flue gas loss determination, and in particular to a method and apparatus for determining flue gas loss in an oxygen-enriched combustion boiler. Background Technology

[0002] Oxygen-enriched combustion (OEC) technology is of significant value in reducing carbon emissions in the power industry as a carbon dioxide capture technology. It provides high-concentration carbon dioxide for subsequent utilization, compression, and storage, greatly reducing the energy consumption associated with carbon dioxide separation. Flue gas loss in OEC boilers is a crucial indicator of their energy efficiency and operational normality. However, current technologies lack effective and feasible methods for determining flue gas loss in OEC boilers. Summary of the Invention

[0003] One object of the present invention is to provide a method for determining the flue gas loss of an oxy-fuel combustion boiler, thereby solving the problem of the lack of an effective and feasible method for determining the flue gas loss of an oxy-fuel combustion boiler. Another object of the present invention is to provide a device for determining the flue gas loss of an oxy-fuel combustion boiler. A further object of the present invention is to provide a computer device. A still other object of the present invention is to provide a readable medium.

[0004] To achieve the above objectives, one aspect of the present invention discloses a method for determining flue gas losses in an oxygen-enriched combustion boiler, the method comprising:

[0005] The amount of flue gas emitted per unit mass of received base coal is obtained based on the parameters of the received base coal and the carbon dioxide concentration detected at the flue gas recirculation extraction point.

[0006] Based on the received base coal parameters, the carbon dioxide concentration detected at the flue gas recirculation extraction point, the oxygen concentration detected at the flue gas recirculation extraction point, the water vapor concentration detected at the flue gas recirculation extraction point, atmospheric parameters, and oxygen injection purity, the total boiler air leakage and oxygen injection volume corresponding to a unit mass of received base coal are obtained. Then, based on the total boiler air leakage and flue gas volume corresponding to a unit mass of received base coal, the water vapor concentration detected at the flue gas recirculation extraction point, the received base coal parameters, and the atmospheric parameters, the condensate vapor volume corresponding to a unit mass of received base coal is obtained.

[0007] Based on the oxygen injection amount per unit mass of received base coal, primary air oxygen injection parameters, secondary air oxygen injection parameters, drying air oxygen injection parameters, oxygen purity, and oxygen concentration detected at the flue gas recirculation extraction point, the recirculated flue gas volume per unit mass of received base coal is obtained. Based on the recirculated flue gas volume, water vapor concentration detected at the flue gas recirculation extraction point, exhaust volume, condensate volume, atmospheric parameters, received base coal parameters, total boiler air leakage, and carbon dioxide concentration detected at the air preheater outlet and flue gas recirculation extraction point, the water vapor concentration at the air preheater outlet is obtained.

[0008] The exhaust gas loss of the oxygen-enriched combustion boiler is calculated based on the atmospheric parameters, the carbon dioxide concentration detected at the flue gas recirculation extraction point, the oxygen concentration detected at the flue gas recirculation extraction point, the water vapor concentration detected at the flue gas recirculation extraction point, the water vapor concentration at the air preheater outlet, the carbon dioxide concentration detected at the air preheater outlet, the oxygen concentration detected at the air preheater outlet, the condensate steam volume, the exhaust gas volume, the recirculated flue gas volume, the oxygen injection volume, the specific heat capacity parameter, the total air leakage volume, the combustion parameters, and the detected temperature parameters.

[0009] Optionally, the step of obtaining the flue gas emission per unit mass of received base coal based on the carbon dioxide concentration detected at the flue gas recirculation extraction point includes:

[0010] Based on the received base coal parameters, the carbon element quality index of the received base coal is obtained;

[0011] The amount of flue gas emitted per unit mass of received base coal is obtained based on the carbon element quality index of the received base coal and the carbon dioxide concentration detected at the flue gas recirculation extraction point.

[0012] Optionally, the step of obtaining the total boiler air leakage and oxygen injection volume per unit mass of received base coal based on the received base coal parameters, the carbon dioxide concentration detected at the flue gas recirculation extraction point, the oxygen concentration detected at the flue gas recirculation extraction point, the water vapor concentration detected at the flue gas recirculation extraction point, atmospheric parameters, and oxygen injection purity includes:

[0013] Based on the received base coal parameters, the carbon, hydrogen, oxygen, nitrogen, sulfur and moisture quality indicators of the received base coal are obtained.

[0014] Based on the atmospheric parameters, the absolute humidity of the atmosphere is obtained;

[0015] Based on the carbon, hydrogen, oxygen, nitrogen, sulfur, and moisture content of the received base coal, the absolute atmospheric humidity, oxygen purity, carbon dioxide concentration detected at the flue gas recirculation extraction point, oxygen concentration detected at the flue gas recirculation extraction point, and water vapor concentration detected at the flue gas recirculation extraction point, the total boiler air leakage per unit mass of received base coal is obtained.

[0016] Based on the oxygen purity, carbon element quality index, hydrogen element quality index, oxygen element quality index, sulfur element quality index, carbon dioxide concentration detected at the flue gas recirculation extraction point, oxygen concentration detected at the flue gas recirculation extraction point, absolute atmospheric humidity, and total boiler air leakage, the oxygen injection amount corresponding to the unit mass of received base coal is obtained.

[0017] Optionally, the step of obtaining the amount of condensed water vapor per unit mass of received base coal based on the total boiler air leakage, flue gas volume, water vapor concentration detected at the flue gas recirculation extraction point, the received base coal parameters, and the atmospheric parameters includes:

[0018] Based on the received base coal parameters, the hydrogen element quality index and moisture quality index of the received base coal are obtained;

[0019] Based on the atmospheric parameters, the absolute humidity of the atmosphere is obtained;

[0020] Based on the hydrogen quality index, moisture quality index, absolute atmospheric humidity, total boiler air leakage, flue gas volume, and water vapor concentration detected at the flue gas recirculation extraction point, the amount of condensed water vapor corresponding to a unit mass of received base coal is obtained.

[0021] Optionally, the step of obtaining the recirculated flue gas volume corresponding to a unit mass of received base coal based on the oxygen injection volume corresponding to the unit mass of received base coal, the primary air oxygen injection parameters, the secondary air oxygen injection parameters, the drying air oxygen injection parameters, the oxygen purity, and the oxygen concentration detected at the flue gas recirculation extraction point includes:

[0022] Based on the primary air oxygen injection parameters, the oxygen concentration and primary air oxygen supply flow rate after primary air oxygen injection are obtained;

[0023] Based on the secondary air oxygen injection parameters, the oxygen concentration and secondary air oxygen supply flow rate after secondary air oxygen injection are obtained.

[0024] Based on the oxygen injection parameters of the dry air, the oxygen concentration and oxygen supply flow rate of the dry air after oxygen injection are obtained;

[0025] The amount of recirculated flue gas corresponding to a unit mass of received base coal is obtained based on the oxygen concentration after primary air oxygen injection, the primary air oxygen supply flow rate, the secondary air oxygen injection concentration after secondary air oxygen injection, the secondary air oxygen supply flow rate, the oxygen concentration after drying air oxygen injection, the drying air oxygen supply flow rate, the amount of oxygen injected per unit mass of received base coal, the oxygen purity, and the oxygen concentration detected at the flue gas recirculation extraction point.

[0026] Optionally, the step of obtaining the water vapor concentration at the air preheater outlet based on the recirculated flue gas volume, the water vapor concentration detected at the flue gas recirculation extraction point, the exhaust volume, the condensate vapor volume, atmospheric parameters, received base coal parameters, the total boiler air leakage, and the carbon dioxide concentration detected at the air preheater outlet and the flue gas recirculation extraction point includes:

[0027] Based on the atmospheric parameters, the absolute humidity of the atmosphere is obtained;

[0028] Based on the received base coal parameters, the hydrogen element quality index and moisture quality index of the received base coal are obtained;

[0029] The water vapor concentration at the air preheater outlet is obtained based on the hydrogen quality index, moisture quality index, absolute atmospheric humidity, recirculated flue gas volume, water vapor concentration detected at the flue gas recirculation extraction point, exhaust volume, condensate steam volume, total boiler air leakage, air preheater outlet, and carbon dioxide concentration detected at the flue gas recirculation extraction point.

[0030] Optionally, the step of calculating the flue gas emission loss of the oxygen-enriched combustion boiler based on the atmospheric parameters, the carbon dioxide concentration detected at the flue gas recirculation extraction point, the oxygen concentration detected at the flue gas recirculation extraction point, the water vapor concentration detected at the flue gas recirculation extraction point, the water vapor concentration at the air preheater outlet, the carbon dioxide concentration detected at the air preheater outlet, the oxygen concentration detected at the air preheater outlet, the condensate steam volume, the flue gas emission volume, the recirculated flue gas volume, the oxygen injection volume, the specific heat capacity parameter, the total air leakage volume, the combustion parameters, and the detected temperature parameters includes:

[0031] Based on the atmospheric parameters, the absolute humidity of the atmosphere is obtained;

[0032] Based on the combustion parameters, the solid incomplete combustion loss and the lower heating value of coal are obtained;

[0033] Based on the specific heat capacity parameters, the specific heat capacity of oxygen, air, and water are obtained.

[0034] Based on the temperature parameters, the gas temperature at the air preheater outlet, the gas temperature at the flue gas recirculation extraction point, the oxygen injection temperature, and the atmospheric temperature are obtained.

[0035] The exhaust losses of the oxygen-enriched combustion boiler are calculated based on the absolute atmospheric humidity, incomplete combustion loss of solids, lower heating value of coal, specific heat capacity of oxygen, specific heat capacity of air, specific heat capacity of water, gas temperature at the air preheater outlet, gas temperature at the flue gas recirculation extraction point, temperature of injected oxygen, atmospheric temperature, carbon dioxide concentration detected at the flue gas recirculation extraction point, oxygen concentration detected at the flue gas recirculation extraction point, water vapor concentration detected at the flue gas recirculation extraction point, water vapor concentration at the air preheater outlet, carbon dioxide concentration detected at the air preheater outlet, oxygen concentration detected at the air preheater outlet, condensate steam volume, exhaust volume, recirculated flue gas volume, oxygen injection volume, and total air leakage.

[0036] Optionally, the step of obtaining the total boiler air leakage per unit mass of received base coal based on the carbon, hydrogen, oxygen, nitrogen, sulfur, and moisture content of the received base coal, as well as the absolute atmospheric humidity, oxygen purity, carbon dioxide concentration detected at the flue gas recirculation extraction point, oxygen concentration detected at the flue gas recirculation extraction point, and water vapor concentration detected at the flue gas recirculation extraction point, includes:

[0037] Based on the aforementioned carbon, hydrogen, nitrogen, sulfur, and moisture quality indicators, the amount of flue gas required for the complete combustion of a unit mass of received base coal is obtained.

[0038] Based on the aforementioned carbon, hydrogen, sulfur, and oxygen quality indicators, the theoretical amount of oxygen required for the complete combustion of a unit mass of received base coal is obtained.

[0039] Based on the amount of flue gas required for complete combustion of a unit mass of received base coal, the theoretical amount of oxygen required for complete combustion of a unit mass of received base coal, the carbon element quality index, the hydrogen element quality index, the moisture quality index, the oxygen injection purity, the oxygen concentration detected at the flue gas recirculation extraction point, the carbon dioxide concentration detected at the flue gas recirculation extraction point, the water vapor concentration detected at the flue gas recirculation extraction point, and the absolute humidity of the atmosphere, the total boiler air leakage corresponding to a unit mass of received base coal is obtained.

[0040] Optionally, the step of obtaining the total boiler air leakage per unit mass of received base coal based on the amount of flue gas from the complete combustion of the received base coal, the theoretical amount of oxygen required for the complete combustion of the received base coal, the carbon element quality index, the hydrogen element quality index, the moisture quality index, the oxygen injection purity, the oxygen concentration detected at the flue gas recirculation extraction point, the carbon dioxide concentration detected at the flue gas recirculation extraction point, the water vapor concentration detected at the flue gas recirculation extraction point, and the absolute humidity of the atmosphere includes:

[0041] Based on the amount of flue gas from the complete combustion of a unit mass of received base coal, the theoretical amount of oxygen required for the complete combustion of a unit mass of received base coal, the carbon element quality index, the hydrogen element quality index, the moisture quality index, the oxygen injection purity, the oxygen concentration detected at the flue gas recirculation extraction point, the carbon dioxide concentration detected at the flue gas recirculation extraction point, and the water vapor concentration detected at the flue gas recirculation extraction point, the amount of nitrogen in the total boiler air leakage corresponding to a unit mass of received base coal is obtained.

[0042] Based on the oxygen purity and absolute atmospheric humidity, the proportion of nitrogen in the total boiler air leakage corresponding to a unit mass of received base coal is obtained.

[0043] Based on the nitrogen quantity and the nitrogen quantity ratio, the total boiler air leakage corresponding to a unit mass of received base coal is obtained.

[0044] Optionally, the step of obtaining the oxygen injection amount per unit mass of received base coal based on the oxygen injection purity, carbon element quality index, hydrogen element quality index, oxygen element quality index, sulfur element quality index, carbon dioxide concentration detected at the flue gas recirculation extraction point, oxygen concentration detected at the flue gas recirculation extraction point, absolute atmospheric humidity, and total boiler air leakage includes:

[0045] Based on the carbon element quality index, the oxygen concentration detected at the flue gas recirculation extraction point, and the carbon dioxide concentration detected at the flue gas recirculation extraction point, the oxygen content of the chimney exhaust corresponding to a unit mass of received base coal is obtained.

[0046] Based on the absolute atmospheric humidity and the total air leakage of the boiler, the amount of additional oxygen brought in by the air leakage per unit mass of received base coal is obtained.

[0047] Based on the aforementioned carbon, hydrogen, sulfur, and oxygen quality indicators, the theoretical amount of oxygen required for the complete combustion of a unit mass of received base coal is obtained.

[0048] Based on the oxygen content in the chimney exhaust, the additional oxygen due to air leakage, the theoretical oxygen required for complete combustion, and the purity of the injected oxygen, the amount of oxygen injected per unit mass of received base coal is obtained.

[0049] Optionally, the step of obtaining the amount of condensed water vapor per unit mass of received base coal based on the hydrogen quality index, moisture quality index, absolute atmospheric humidity, total boiler air leakage, flue gas volume, and water vapor concentration detected at the flue gas recirculation extraction point includes:

[0050] Based on the hydrogen element quality index and moisture quality index, the amount of water vapor generated per unit mass of received base coal combustion is obtained;

[0051] Based on the absolute atmospheric humidity and the total air leakage of the boiler, the amount of water vapor in the air leakage corresponding to a unit mass of received base coal is obtained.

[0052] Based on the flue gas volume and the water vapor concentration detected at the flue gas recirculation extraction point, the amount of water vapor in the flue gas of the boiler corresponding to a unit mass of received base coal is obtained.

[0053] The amount of condensed water vapor per unit mass of received base coal is obtained based on the amount of water vapor generated by the combustion of base coal per unit mass, the amount of water vapor in the leaked air corresponding to the base coal per unit mass, and the amount of water vapor in the flue gas of the boiler exhaust corresponding to the base coal per unit mass.

[0054] Optionally, the step of obtaining the recirculated flue gas volume corresponding to a unit mass of received base coal based on the oxygen concentration after primary air oxygen injection, the primary air oxygen supply flow rate, the secondary air oxygen injection concentration after secondary air oxygen injection, the secondary air oxygen supply flow rate, the drying air oxygen injection concentration after drying air oxygen injection, the oxygen injection volume corresponding to a unit mass of received base coal, the oxygen injection purity, and the oxygen concentration detected at the flue gas recirculation extraction point includes:

[0055] Based on the oxygen injection amount corresponding to the unit mass of received base coal, the oxygen concentration after primary air oxygen injection, the oxygen injection purity, the oxygen concentration detected at the flue gas recirculation extraction point, the primary air oxygen supply flow rate, the secondary air oxygen supply flow rate, and the drying air oxygen supply flow rate, the amount of recirculated flue gas before primary air oxygen injection in the recirculated flue gas corresponding to the unit mass of received base coal is obtained.

[0056] Based on the oxygen injection amount corresponding to the unit mass of base coal received, the oxygen concentration after secondary air oxygen injection, the oxygen injection purity, the oxygen concentration detected at the flue gas recirculation extraction point, the primary air oxygen supply flow rate, the secondary air oxygen supply flow rate, and the drying air oxygen supply flow rate, the amount of recirculated flue gas before secondary air oxygen injection in the recirculated flue gas corresponding to the unit mass of base coal received is obtained.

[0057] Based on the oxygen injection amount corresponding to the unit mass of base coal received, the oxygen concentration after oxygen injection of dry air, the oxygen injection purity, the oxygen concentration detected at the flue gas recirculation extraction point, the primary air oxygen supply flow rate, the secondary air oxygen supply flow rate, and the dry air oxygen supply flow rate, the amount of recirculated flue gas before oxygen injection of dry air in the recirculated flue gas corresponding to the unit mass of base coal received is obtained.

[0058] The amount of recirculated flue gas corresponding to a unit mass of received base coal is obtained based on the amount of recirculated flue gas before primary air oxygen injection, the amount of recirculated flue gas before secondary air oxygen injection, and the amount of recirculated flue gas before drying air oxygen injection in the recirculated flue gas corresponding to the unit mass of received base coal.

[0059] Optionally, the step of obtaining the water vapor concentration at the air preheater outlet based on the hydrogen quality index, moisture quality index, absolute atmospheric humidity, recirculated flue gas volume, water vapor concentration detected at the flue gas recirculation extraction point, exhaust volume, condensate steam volume, total boiler air leakage, air preheater outlet, and carbon dioxide concentration detected at the flue gas recirculation extraction point includes:

[0060] Based on the recirculated flue gas volume and the water vapor concentration detected at the flue gas recirculation extraction point, the water vapor content in the recirculated flue gas corresponding to a unit mass of received base coal is obtained.

[0061] Based on the hydrogen element quality index and moisture quality index, the amount of water vapor obtained per unit mass of received base coal combustion is obtained.

[0062] Based on the condensate steam volume, flue gas volume, recirculated flue gas volume, carbon dioxide concentration detected at the flue gas recirculation extraction point, carbon dioxide concentration detected at the air preheater outlet, atmospheric absolute humidity, and total boiler air leakage, the amount of water vapor in the air leakage from the furnace to the air preheater corresponding to a unit mass of received base coal is obtained.

[0063] Based on the recirculated flue gas volume, condensate vapor volume, exhaust volume, carbon dioxide concentration detected at the flue gas recirculation extraction point, and carbon dioxide concentration detected at the air preheater outlet, the flue gas volume corresponding to the air preheater flue for a unit mass of received base coal is obtained.

[0064] The water vapor concentration at the air preheater outlet is obtained based on the amount of water vapor in the recirculated flue gas corresponding to the unit mass of received base coal, the amount of water vapor obtained from the combustion of the unit mass of received base coal, the amount of water vapor in the air leakage from the furnace to the air preheater corresponding to the unit mass of received base coal, and the amount of flue gas in the air preheater flue corresponding to the unit mass of received base coal.

[0065] Optionally, the step of obtaining the amount of water vapor in the air leakage from the furnace to the air preheater corresponding to a unit mass of received base coal based on the amount of condensed water vapor, the amount of flue gas, the amount of recirculated flue gas, the carbon dioxide concentration detected at the flue gas recirculation extraction point, the carbon dioxide concentration detected at the air preheater outlet, the absolute atmospheric humidity, and the total air leakage of the boiler includes:

[0066] Based on the amount of condensed water vapor, the amount of flue gas, the amount of recirculated flue gas, the carbon dioxide concentration detected at the flue gas recirculation extraction point, and the carbon dioxide concentration detected at the air preheater outlet, the air leakage between the air preheater and the flue gas recirculation extraction point corresponding to a unit mass of received base coal is obtained.

[0067] Based on the total air leakage of the boiler and the air leakage between the air preheater and the flue gas recirculation extraction point corresponding to the unit mass of received base coal, the air leakage from the furnace to the air preheater corresponding to the unit mass of received base coal is obtained.

[0068] The amount of water vapor in the air leakage from the furnace to the air preheater corresponding to the unit mass of received base coal is obtained based on the air leakage from the furnace to the air preheater corresponding to the unit mass of received base coal and the absolute humidity of the atmosphere.

[0069] Optionally, the step of obtaining the flue gas volume of the air preheater flue corresponding to a unit mass of received base coal based on the recirculated flue gas volume, condensate vapor volume, exhaust volume, carbon dioxide concentration detected at the flue gas recirculation extraction point, and carbon dioxide concentration detected at the air preheater outlet includes:

[0070] Based on the amount of condensed water vapor, the amount of flue gas, the amount of recirculated flue gas, the carbon dioxide concentration detected at the flue gas recirculation extraction point, and the carbon dioxide concentration detected at the air preheater outlet, the air leakage between the air preheater and the flue gas recirculation extraction point corresponding to a unit mass of received base coal is obtained.

[0071] The flue gas volume of the air preheater flue corresponding to the unit mass of received base coal is obtained based on the recirculated flue gas volume, condensate vapor volume, exhaust volume, and the air leakage between the air preheater and the flue gas recirculation extraction point corresponding to the unit mass of received base coal.

[0072] Optionally, the step of obtaining the flue gas loss of the oxygen-enriched combustion boiler based on the absolute atmospheric humidity, incomplete combustion loss of solids, lower heating value of coal, specific heat capacity of oxygen, specific heat capacity of air, specific heat capacity of water, gas temperature at the air preheater outlet, gas temperature at the flue gas recirculation extraction point, temperature of injected oxygen, atmospheric temperature, carbon dioxide concentration detected at the flue gas recirculation extraction point, oxygen concentration detected at the flue gas recirculation extraction point, water vapor concentration detected at the flue gas recirculation extraction point, water vapor concentration at the air preheater outlet, carbon dioxide concentration detected at the air preheater outlet, oxygen concentration detected at the air preheater outlet, condensate steam volume, flue gas volume, recirculated flue gas volume, oxygen injection volume, and total air leakage includes:

[0073] Based on the amount of condensed water vapor, the amount of flue gas, the amount of recirculated flue gas, the carbon dioxide concentration detected at the flue gas recirculation extraction point, and the carbon dioxide concentration detected at the air preheater outlet, the air leakage between the air preheater and the flue gas recirculation extraction point corresponding to a unit mass of received base coal is obtained.

[0074] Based on the total air leakage and the air leakage between the air preheater and the flue gas recirculation extraction point corresponding to the unit mass of received base coal, the air leakage from the furnace to the air preheater corresponding to the unit mass of received base coal is obtained.

[0075] The specific heat capacity of the gas at the outlet of the air preheater is obtained based on the water vapor concentration at the outlet of the air preheater, the carbon dioxide concentration detected at the outlet of the air preheater, and the oxygen concentration detected at the outlet of the air preheater.

[0076] The specific heat capacity of the gas at the flue gas recirculation extraction point is obtained based on the water vapor concentration, carbon dioxide concentration, and oxygen concentration detected at the flue gas recirculation extraction point.

[0077] Based on the condensate steam volume, flue gas volume, recirculated flue gas volume, air leakage between the air preheater and the flue gas recirculation extraction point, the specific heat capacity of the gas at the air preheater outlet, and the gas temperature at the air preheater outlet, the enthalpy of the boiler main flue gas corresponding to a unit mass of received base coal is obtained.

[0078] Based on the recirculated flue gas volume, the specific heat capacity of the gas at the flue gas recirculation extraction point, and the gas temperature at the flue gas recirculation extraction point, the enthalpy of the recirculated flue gas corresponding to a unit mass of received base coal is obtained.

[0079] Based on the oxygen injection volume, the specific heat capacity of oxygen, and the temperature of the injected oxygen, the enthalpy of the injected oxygen corresponding to a unit mass of received base coal is obtained.

[0080] Based on the specific heat capacity of the air, the temperature of the atmosphere, the absolute humidity of the atmosphere, and the air leakage from the furnace to the air preheater, the enthalpy of the dry air in the air leakage from the furnace to the air preheater corresponding to a unit mass of received base coal is obtained.

[0081] Based on the specific heat capacity of water, atmospheric temperature, atmospheric absolute humidity, and air leakage from the furnace to the air preheater, the enthalpy of water vapor in the air leakage from the furnace to the air preheater corresponding to a unit mass of received base coal is obtained.

[0082] The exhaust gas loss of an oxygen-enriched combustion boiler is obtained based on the enthalpy of the main flue gas in the boiler corresponding to a unit mass of received base coal, the enthalpy of the circulating flue gas corresponding to a unit mass of received base coal, the enthalpy of the injected oxygen corresponding to a unit mass of received base coal, the enthalpy of the dry air in the leaked air from the furnace to the air preheater corresponding to a unit mass of received base coal, the enthalpy of the water vapor in the leaked air from the furnace to the air preheater corresponding to a unit mass of received base coal, the incomplete combustion loss of solids, and the lower heating value of coal.

[0083] Optionally, the step of obtaining the specific heat capacity of the gas at the air preheater outlet based on the water vapor concentration, carbon dioxide concentration detected at the air preheater outlet, and oxygen concentration detected at the air preheater outlet includes:

[0084] The nitrogen concentration at the air preheater outlet is obtained based on the water vapor concentration, carbon dioxide concentration, and oxygen concentration detected at the air preheater outlet.

[0085] Based on the water vapor concentration, carbon dioxide concentration, and oxygen concentration detected at the air preheater outlet, the nitrogen concentration at the air preheater outlet is obtained, and the specific heat capacity of water vapor, carbon dioxide, oxygen, and nitrogen at the air preheater outlet are obtained respectively.

[0086] The specific heat capacity of the gas at the outlet of the air preheater is obtained based on the specific heat capacity of water vapor at the outlet of the air preheater, the specific heat capacity of carbon dioxide at the outlet of the air preheater, the specific heat capacity of oxygen at the outlet of the air preheater, and the specific heat capacity of nitrogen at the outlet of the air preheater.

[0087] Optionally, the step of obtaining the gas specific heat capacity at the flue gas recirculation extraction point based on the water vapor concentration, carbon dioxide concentration, and oxygen concentration detected at the flue gas recirculation extraction point includes:

[0088] The nitrogen concentration at the flue gas recirculation extraction point is obtained based on the water vapor concentration, carbon dioxide concentration, and oxygen concentration detected at the flue gas recirculation extraction point.

[0089] Based on the water vapor concentration, carbon dioxide concentration, oxygen concentration, and nitrogen concentration detected at the flue gas recirculation extraction point, the specific heat capacity of water vapor, carbon dioxide, oxygen, and nitrogen at the flue gas recirculation extraction point are obtained respectively.

[0090] The specific heat capacity of the gas at the flue gas recirculation extraction point is obtained based on the specific heat capacity of water vapor, carbon dioxide, oxygen, and nitrogen at the flue gas recirculation extraction point.

[0091] To achieve the above objectives, another aspect of the present invention discloses a device for determining the flue gas loss of an oxygen-enriched combustion boiler, the device comprising:

[0092] The flue gas emission determination module is used to determine the flue gas emission per unit mass of received base coal based on the parameters of the received base coal and the carbon dioxide concentration detected at the flue gas recirculation extraction point.

[0093] The condensate vapor quantity determination module is used to determine the total boiler air leakage and oxygen injection quantity corresponding to a unit mass of received base coal based on the received base coal parameters, the carbon dioxide concentration detected at the flue gas recirculation extraction point, the oxygen concentration detected at the flue gas recirculation extraction point, the water vapor concentration detected at the flue gas recirculation extraction point, atmospheric parameters, and oxygen injection purity. Furthermore, it determines the condensate vapor quantity corresponding to a unit mass of received base coal based on the total boiler air leakage and flue gas emission volume corresponding to a unit mass of received base coal, the water vapor concentration detected at the flue gas recirculation extraction point, the received base coal parameters, and the atmospheric parameters.

[0094] The air preheater outlet water vapor concentration determination module is used to obtain the recirculated flue gas volume corresponding to the unit mass of received base coal based on the oxygen injection volume corresponding to the unit mass of received base coal, the primary air oxygen injection parameters, the secondary air oxygen injection parameters, the dry air oxygen injection parameters, the oxygen injection purity, and the oxygen concentration detected at the flue gas recirculation extraction point. Based on the recirculated flue gas volume, the water vapor concentration detected at the flue gas recirculation extraction point, the exhaust volume, the condensate water vapor volume, the atmospheric parameters, the received base coal parameters, the total boiler air leakage, and the carbon dioxide concentration detected at the air preheater outlet and the flue gas recirculation extraction point, the water vapor concentration at the air preheater outlet is obtained.

[0095] The flue gas loss determination module is used to determine the flue gas loss of the oxygen-enriched combustion boiler based on the atmospheric parameters, the carbon dioxide concentration detected at the flue gas recirculation extraction point, the oxygen concentration detected at the flue gas recirculation extraction point, the water vapor concentration detected at the flue gas recirculation extraction point, the water vapor concentration at the air preheater outlet, the carbon dioxide concentration detected at the air preheater outlet, the oxygen concentration detected at the air preheater outlet, the condensate steam volume, the flue gas volume, the recirculated flue gas volume, the oxygen injection volume, the specific heat capacity parameter, the total air leakage volume, the combustion parameters, and the detected temperature parameters.

[0096] The present invention also discloses a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the method described above.

[0097] The present invention also discloses a computer-readable medium having a computer program stored thereon, which, when executed by a processor, implements the method described above.

[0098] The method and apparatus for determining the flue gas loss of an oxy-fuel combustion boiler provided by this invention obtains the flue gas emission per unit mass of received base coal based on the parameters of the received base coal and the carbon dioxide concentration detected at the flue gas recirculation extraction point. This provides the necessary input parameters for the subsequent step of determining the flue gas loss of the oxy-fuel combustion boiler, and replaces the method of measuring the flue gas emission with measuring instruments by calculation, thereby reducing the cost of determining the flue gas emission per unit mass of received base coal, and thus indirectly reducing the cost of determining the flue gas loss of the oxy-fuel combustion boiler. By calculating the total boiler air leakage and oxygen injection volume per unit mass of received base coal based on the received base coal parameters, the carbon dioxide concentration detected at the flue gas recirculation extraction point, the oxygen concentration detected at the flue gas recirculation extraction point, the water vapor concentration detected at the flue gas recirculation extraction point, atmospheric parameters, and oxygen injection purity, the necessary input parameters can be provided for the subsequent step of determining the flue gas loss of an oxy-fuel combustion boiler. This effectively reduces the number and scale of measuring instruments required to determine the total boiler air leakage and oxygen injection volume per unit mass of received base coal, thereby reducing the cost of determining the total boiler air leakage and oxygen injection volume per unit mass of received base coal, and indirectly lowering the cost of determining the flue gas loss of an oxy-fuel combustion boiler. Furthermore, by calculating the condensate vapor volume per unit mass of received base coal based on the total boiler air leakage and flue gas volume per unit mass of received base coal, the water vapor concentration detected at the flue gas recirculation extraction point, the received base coal parameters, and the atmospheric parameters, determining the condensate vapor volume per unit mass of received base coal becomes feasible, thus providing the necessary input parameters for the subsequent step of determining the flue gas loss of an oxy-fuel combustion boiler. By calculating the amount of oxygen injected per unit mass of received base coal, the oxygen injection parameters for primary air, secondary air, and drying air, the oxygen purity, and the oxygen concentration detected at the flue gas recirculation extraction point, the recirculated flue gas volume per unit mass of received base coal can be obtained. This provides the necessary input parameters for subsequent steps in determining the flue gas loss of an oxy-fuel combustion boiler. Furthermore, it enables the determination of the recirculated flue gas volume to be achieved by collecting only the oxygen injection parameters for primary air, secondary air, and drying air, as well as the oxygen concentration detected at the flue gas recirculation extraction point. This effectively reduces the number and scale of measuring instruments required to determine the recirculated flue gas volume per unit mass of received base coal, thereby reducing the cost of determining the recirculated flue gas volume per unit mass of received base coal, and indirectly lowering the cost of determining the flue gas loss of an oxy-fuel combustion boiler. By obtaining the water vapor concentration at the air preheater outlet based on the recirculated flue gas volume, the water vapor concentration detected at the flue gas recirculation extraction point, the exhaust volume, the condensate vapor volume, atmospheric parameters, the received base coal parameters, the total boiler air leakage, and the carbon dioxide concentration detected at the air preheater outlet and the flue gas recirculation extraction point, it becomes feasible to determine the water vapor concentration at the air preheater outlet. This provides the necessary input parameters for the subsequent step of determining the flue gas loss of the oxygen-enriched combustion boiler.The exhaust gas loss of an oxy-fuel combustion boiler is determined based on the atmospheric parameters, the carbon dioxide concentration detected at the flue gas recirculation extraction point, the oxygen concentration detected at the flue gas recirculation extraction point, the water vapor concentration detected at the flue gas recirculation extraction point, the water vapor concentration at the air preheater outlet, the carbon dioxide concentration detected at the air preheater outlet, the oxygen concentration detected at the air preheater outlet, the condensate steam volume, the exhaust gas volume, the recirculated flue gas volume, the oxygen injection volume, the specific heat capacity parameter, the total air leakage, the combustion parameters, and the detected temperature parameters. This method makes determining the exhaust gas loss of an oxy-fuel combustion boiler feasible while minimizing the number of parameters required for the determination process, thereby reducing the number and scale of equipment needed to determine the exhaust gas loss of an oxy-fuel combustion boiler, and effectively reducing the cost of determining the exhaust gas loss of an oxy-fuel combustion boiler. In summary, the method and apparatus for determining the exhaust gas loss of an oxy-fuel combustion boiler provided by this invention make determining the exhaust gas loss of an oxy-fuel combustion boiler feasible and reduce the number of equipment required for the determination process, thereby effectively reducing the cost of determining the exhaust gas loss of an oxy-fuel combustion boiler. Attached Figure Description

[0099] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0100] Figure 1 A flowchart illustrating a method for determining flue gas losses in an oxygen-enriched combustion boiler according to an embodiment of the present invention is shown.

[0101] Figure 2 This illustration shows a schematic diagram of an optional step in obtaining the total boiler air leakage and oxygen injection volume corresponding to a unit mass of received base coal according to an embodiment of the present invention.

[0102] Figure 3 A schematic diagram illustrating an optional step in an embodiment of the present invention for obtaining the amount of condensate vapor per unit mass of received base coal is shown.

[0103] Figure 4 A schematic diagram illustrating an optional step in an embodiment of the present invention for obtaining the amount of recirculated flue gas corresponding to a unit mass of received base coal is shown.

[0104] Figure 5 A schematic diagram illustrating an optional step in obtaining the water vapor concentration at the outlet of an air preheater according to an embodiment of the present invention is shown.

[0105] Figure 6A schematic diagram of a module for determining flue gas loss in an oxygen-enriched combustion boiler according to an embodiment of the present invention is shown.

[0106] Figure 7 A schematic diagram of a computer device suitable for implementing embodiments of the present invention is shown. Detailed Implementation

[0107] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0108] The terms "first," "second," etc., used in this document do not specifically refer to any order or sequence, nor are they intended to limit the invention; they are merely used to distinguish elements or operations described using the same technical terms.

[0109] The terms “include,” “including,” “have,” “contain,” etc., used in this article are all open-ended terms, meaning that they include but are not limited to.

[0110] The term "and / or" as used herein includes any or all of the things mentioned.

[0111] It should be noted that the acquisition, storage, use, and processing of data in the technical solution of this invention all comply with the relevant provisions of national laws and regulations.

[0112] This invention discloses a method for determining flue gas losses in an oxygen-enriched combustion boiler, such as... Figure 1 As shown, the method specifically includes the following steps:

[0113] S101: The amount of flue gas emitted per unit mass of received base coal is obtained based on the parameters of the received base coal and the carbon dioxide concentration detected at the flue gas recirculation extraction point.

[0114] S102: Based on the received base coal parameters, the carbon dioxide concentration detected at the flue gas recirculation extraction point, the oxygen concentration detected at the flue gas recirculation extraction point, the water vapor concentration detected at the flue gas recirculation extraction point, atmospheric parameters, and oxygen injection purity, the total boiler air leakage and oxygen injection volume corresponding to a unit mass of received base coal are obtained. Then, based on the total boiler air leakage and flue gas volume corresponding to a unit mass of received base coal, the water vapor concentration detected at the flue gas recirculation extraction point, the received base coal parameters, and the atmospheric parameters, the condensate vapor volume corresponding to a unit mass of received base coal is obtained.

[0115] S103: Based on the oxygen injection amount corresponding to the unit mass of received base coal, the primary air oxygen injection parameters, the secondary air oxygen injection parameters, the drying air oxygen injection parameters, the oxygen purity, and the oxygen concentration detected at the flue gas recirculation extraction point, the recirculated flue gas volume corresponding to the unit mass of received base coal is obtained. Based on the recirculated flue gas volume, the water vapor concentration detected at the flue gas recirculation extraction point, the exhaust volume, the condensate volume, the atmospheric parameters, the received base coal parameters, the total boiler air leakage, and the carbon dioxide concentration detected at the air preheater outlet and the flue gas recirculation extraction point, the water vapor concentration at the air preheater outlet is obtained.

[0116] S104: The exhaust gas loss of the oxygen-enriched combustion boiler is obtained based on the atmospheric parameters, the carbon dioxide concentration detected at the flue gas recirculation extraction point, the oxygen concentration detected at the flue gas recirculation extraction point, the water vapor concentration detected at the flue gas recirculation extraction point, the water vapor concentration at the air preheater outlet, the carbon dioxide concentration detected at the air preheater outlet, the oxygen concentration detected at the air preheater outlet, the condensate steam volume, the exhaust volume, the recirculated flue gas volume, the oxygen injection volume, the specific heat capacity parameter, the total air leakage volume, the combustion parameters, and the detected temperature parameters.

[0117] The method and apparatus for determining the flue gas loss of an oxy-fuel combustion boiler provided by this invention obtains the flue gas emission per unit mass of received base coal based on the parameters of the received base coal and the carbon dioxide concentration detected at the flue gas recirculation extraction point. This provides the necessary input parameters for the subsequent step of determining the flue gas loss of the oxy-fuel combustion boiler, and replaces the method of measuring the flue gas emission with measuring instruments by calculation, thereby reducing the cost of determining the flue gas emission per unit mass of received base coal, and thus indirectly reducing the cost of determining the flue gas loss of the oxy-fuel combustion boiler. By calculating the total boiler air leakage and oxygen injection volume per unit mass of received base coal based on the received base coal parameters, the carbon dioxide concentration detected at the flue gas recirculation extraction point, the oxygen concentration detected at the flue gas recirculation extraction point, the water vapor concentration detected at the flue gas recirculation extraction point, atmospheric parameters, and oxygen injection purity, the necessary input parameters can be provided for the subsequent step of determining the flue gas loss of an oxy-fuel combustion boiler. This effectively reduces the number and scale of measuring instruments required to determine the total boiler air leakage and oxygen injection volume per unit mass of received base coal, thereby reducing the cost of determining the total boiler air leakage and oxygen injection volume per unit mass of received base coal, and indirectly lowering the cost of determining the flue gas loss of an oxy-fuel combustion boiler. Furthermore, by calculating the condensate vapor volume per unit mass of received base coal based on the total boiler air leakage and flue gas volume per unit mass of received base coal, the water vapor concentration detected at the flue gas recirculation extraction point, the received base coal parameters, and the atmospheric parameters, determining the condensate vapor volume per unit mass of received base coal becomes feasible, thus providing the necessary input parameters for the subsequent step of determining the flue gas loss of an oxy-fuel combustion boiler. By calculating the amount of oxygen injected per unit mass of received base coal, the oxygen injection parameters for primary air, secondary air, and drying air, the oxygen purity, and the oxygen concentration detected at the flue gas recirculation extraction point, the recirculated flue gas volume per unit mass of received base coal can be obtained. This provides the necessary input parameters for subsequent steps in determining the flue gas loss of an oxy-fuel combustion boiler. Furthermore, it enables the determination of the recirculated flue gas volume to be achieved by collecting only the oxygen injection parameters for primary air, secondary air, and drying air, as well as the oxygen concentration detected at the flue gas recirculation extraction point. This effectively reduces the number and scale of measuring instruments required to determine the recirculated flue gas volume per unit mass of received base coal, thereby reducing the cost of determining the recirculated flue gas volume per unit mass of received base coal, and indirectly lowering the cost of determining the flue gas loss of an oxy-fuel combustion boiler. By obtaining the water vapor concentration at the air preheater outlet based on the recirculated flue gas volume, the water vapor concentration detected at the flue gas recirculation extraction point, the exhaust volume, the condensate vapor volume, atmospheric parameters, the received base coal parameters, the total boiler air leakage, and the carbon dioxide concentration detected at the air preheater outlet and the flue gas recirculation extraction point, it becomes feasible to determine the water vapor concentration at the air preheater outlet. This provides the necessary input parameters for the subsequent step of determining the flue gas loss of the oxygen-enriched combustion boiler.The exhaust gas loss of an oxy-fuel combustion boiler is determined based on the atmospheric parameters, the carbon dioxide concentration detected at the flue gas recirculation extraction point, the oxygen concentration detected at the flue gas recirculation extraction point, the water vapor concentration detected at the flue gas recirculation extraction point, the water vapor concentration at the air preheater outlet, the carbon dioxide concentration detected at the air preheater outlet, the oxygen concentration detected at the air preheater outlet, the condensate steam volume, the exhaust gas volume, the recirculated flue gas volume, the oxygen injection volume, the specific heat capacity parameter, the total air leakage, the combustion parameters, and the detected temperature parameters. This method makes determining the exhaust gas loss of an oxy-fuel combustion boiler feasible while minimizing the number of parameters required for the determination process, thereby reducing the number and scale of equipment needed to determine the exhaust gas loss of an oxy-fuel combustion boiler, and effectively reducing the cost of determining the exhaust gas loss of an oxy-fuel combustion boiler. In summary, the method and apparatus for determining the exhaust gas loss of an oxy-fuel combustion boiler provided by this invention make determining the exhaust gas loss of an oxy-fuel combustion boiler feasible and reduce the number of equipment required for the determination process, thereby effectively reducing the cost of determining the exhaust gas loss of an oxy-fuel combustion boiler.

[0118] In an optional implementation, the step of obtaining the flue gas emission per unit mass of received base coal based on the received base coal parameters and the carbon dioxide concentration detected at the flue gas recirculation extraction point includes:

[0119] Based on the received base coal parameters, the carbon element quality index of the received base coal is obtained;

[0120] The amount of flue gas emitted per unit mass of received base coal is obtained based on the carbon element quality index of the received base coal and the carbon dioxide concentration detected at the flue gas recirculation extraction point.

[0121] For example, the parameters of the received base coal include, but are not limited to, the quality (coal) of the received base coal being burned (i.e., the quality of the received base coal) and the carbon element quality index C. ar Hydrogen element quality index H ar Oxygen element quality index O ar Nitrogen element quality index N ar Sulfur element quality index S ar and moisture quality index M ar Therefore, the carbon element quality index of the received base coal can be directly obtained based on the parameters of the received base coal. Specifically, for a given element or substance, the quality index refers to the value obtained by multiplying the percentage of that element or substance's mass in the received base coal by 100; that is, the value obtained by multiplying the mass fraction of that element or substance in the received base coal by 100. The quality index is one of the commonly used parameters in this field.

[0122] For example, the carbon content of the received base coal and the carbon dioxide concentration detected at the flue gas recirculation extraction point are used as indicators. The amount of flue gas V3 per unit mass of received base coal can be obtained through, but is not limited to, the following formula:

[0123]

[0124] For example, the flue gas recirculation extraction point can be, but is not limited to, the flue gas exhaust duct from the flue gas cooler to the chimney, or the flue gas exhaust duct from the flue gas cooler to the air preheater in an oxygen-enriched combustion boiler. It should be noted that the selection of the flue gas recirculation extraction point can be determined by those skilled in the art based on the actual situation; the above description is merely an example and should not be construed as limiting the scope of the application.

[0125] For example, the unit mass can be, but is not limited to, 1 kg.

[0126] For example, the amount of flue gas emitted per unit mass of received base coal is the volume of flue gas emitted from the chimney of an oxygen-enriched combustion boiler after the unit mass of received base coal is burned.

[0127] Through the above steps, it is possible to reduce the cost of determining the amount of smoke emitted per unit mass of received base coal, and further realize the determination of the amount of smoke emitted based on the principles of thermophysical properties and related chemical properties, thereby improving the accuracy of the determined amount of smoke emitted per unit mass of received base coal.

[0128] In one alternative implementation, such as Figure 2 As shown, the step of obtaining the total boiler air leakage and oxygen injection volume per unit mass of received base coal based on the received base coal parameters, the carbon dioxide concentration detected at the flue gas recirculation extraction point, the oxygen concentration detected at the flue gas recirculation extraction point, the water vapor concentration detected at the flue gas recirculation extraction point, atmospheric parameters, and oxygen injection purity includes the following steps:

[0129] S201: Based on the received base coal parameters, obtain the carbon element quality index, hydrogen element quality index, oxygen element quality index, nitrogen element quality index, sulfur element quality index and moisture quality index of the received base coal.

[0130] S202: Obtain the absolute humidity of the atmosphere based on the atmospheric parameters.

[0131] S203: Based on the carbon, hydrogen, oxygen, nitrogen, sulfur, and moisture content of the received base coal, the absolute atmospheric humidity, oxygen purity, carbon dioxide concentration detected at the flue gas recirculation extraction point, oxygen concentration detected at the flue gas recirculation extraction point, and water vapor concentration detected at the flue gas recirculation extraction point, the total boiler air leakage per unit mass of received base coal is obtained.

[0132] S204: Based on the oxygen purity, carbon element quality index, hydrogen element quality index, oxygen element quality index, sulfur element quality index, carbon dioxide concentration detected at the flue gas recirculation extraction point, oxygen concentration detected at the flue gas recirculation extraction point, absolute atmospheric humidity, and total boiler air leakage, the oxygen injection amount corresponding to the unit mass of received base coal is obtained.

[0133] For example, obtaining the carbon, hydrogen, oxygen, nitrogen, sulfur, and moisture quality indicators of the received base coal based on the received base coal parameters is a conventional technical method in this field and will not be elaborated here.

[0134] For example, the atmospheric parameters include, but are not limited to, the absolute humidity d. k Atmospheric parameters, such as atmospheric pressure, allow for the direct determination of absolute atmospheric humidity.

[0135] For example, the oxygen purity x can be, but is not limited to, the purity of the oxygen injected into the oxygen-enriched combustion boiler obtained from the oxygen supplier.

[0136] For example, the carbon dioxide concentration detected at the flue gas recirculation extraction point and the oxygen concentration detected at the flue gas recirculation extraction point... It is detected by a concentration sensor preset at the flue gas recirculation extraction point, but not limited to this one.

[0137] For example, the water vapor concentration detected at the flue gas recirculation extraction point It is detected by a concentration sensor preset at the flue gas recirculation extraction point, but not limited to this one.

[0138] In a preferred embodiment, the water vapor concentration detected at the flue gas recirculation extraction point is first determined by obtaining the flue gas condensation temperature t at the extraction point using a temperature sensor. H2O,imax Then, the flue gas condensation temperature is used as input, and the result is obtained by calculation using the thermal properties of water vapor or by consulting existing tables of water vapor thermal properties.

[0139] It should be noted that, in the embodiments of the present invention, the term "corresponding to a unit mass of received base coal..." refers to the amount of matter or energy required, generated, or resulting inflow or consumption in an oxygen-enriched combustion boiler due to the combustion of a unit mass of received base coal. It should be clarified that the above interpretation of the meaning of these terms is merely illustrative and not exhaustive, and therefore does not constitute a limitation on the present invention.

[0140] The total boiler air leakage corresponding to a unit mass of received base coal is obtained through the above steps. and oxygen supply While reducing the cost of determining the total boiler air leakage and oxygen injection volume corresponding to a unit mass of received base coal, it further enables the determination of the total boiler air leakage and oxygen injection volume corresponding to a unit mass of received base coal based on multiple parameters closely related to the total air leakage and oxygen injection volume, thereby improving the accuracy of the determined total boiler air leakage and oxygen injection volume corresponding to a unit mass of received base coal.

[0141] In one alternative implementation, such as Figure 3 As shown, the step of obtaining the amount of condensed water vapor per unit mass of received base coal based on the total boiler air leakage, flue gas volume, water vapor concentration detected at the flue gas recirculation extraction point, the received base coal parameters, and the atmospheric parameters includes the following steps:

[0142] S301: Based on the received base coal parameters, obtain the hydrogen element quality index and moisture quality index of the received base coal.

[0143] S302: Obtain the absolute humidity of the atmosphere based on the atmospheric parameters.

[0144] S303: Based on the hydrogen quality index, moisture quality index, absolute atmospheric humidity, total boiler air leakage, flue gas volume, and water vapor concentration detected at the flue gas recirculation extraction point, the amount of condensed water vapor corresponding to a unit mass of received base coal is obtained.

[0145] For example, obtaining the hydrogen and moisture quality indicators of the received base coal based on the received base coal parameters is a conventional technique in this field and will not be elaborated here.

[0146] For example, obtaining the absolute humidity of the atmosphere based on the atmospheric parameters is a conventional technique in this field and will not be described in detail here.

[0147] For example, the amount of condensed water vapor refers to the volume of water vapor condensed in the flue gas after the flue gas passes through the flue gas condenser of the oxygen-enriched combustion boiler.

[0148] The amount of condensate vapor per unit mass of received base coal is obtained through the above steps. This method makes it feasible to determine the amount of condensed water vapor corresponding to a unit mass of received base coal, and further enables the determination of the amount of condensed water vapor corresponding to a unit mass of received base coal based on multiple parameters closely related to the amount of condensed water vapor, thereby improving the accuracy of the determined amount of condensed water vapor corresponding to a unit mass of received base coal.

[0149] In one alternative implementation, such as Figure 4 As shown, the step of obtaining the recirculated flue gas volume corresponding to a unit mass of received base coal based on the oxygen injection volume corresponding to the unit mass of received base coal, the primary air oxygen injection parameters, the secondary air oxygen injection parameters, the drying air oxygen injection parameters, the oxygen purity, and the oxygen concentration detected at the flue gas recirculation extraction point includes the following steps:

[0150] S401: Based on the primary air oxygenation parameters, obtain the oxygen concentration and primary air oxygenation flow rate after primary air oxygenation.

[0151] S402: Based on the secondary air oxygenation parameters, obtain the oxygen concentration and secondary air oxygen supply flow rate after secondary air oxygenation.

[0152] S403: Based on the oxygen injection parameters of the dry air, obtain the oxygen concentration and oxygen supply flow rate of the dry air after oxygen injection.

[0153] S404: Based on the oxygen concentration after primary air oxygen injection, primary air oxygen supply flow rate, secondary air oxygen injection, secondary air oxygen supply flow rate, oxygen concentration after drying air oxygen injection, drying air oxygen supply flow rate, oxygen injection amount per unit mass of received base coal, oxygen injection purity, and oxygen concentration detected at the flue gas recirculation extraction point, the recirculated flue gas volume per unit mass of received base coal is obtained.

[0154] For example, the primary air oxygen injection parameters can be, but are not limited to, those collected by sensors preset in the primary air duct of an oxygen-enriched combustion boiler. These parameters include, but are not limited to, the oxygen concentration r after primary air injection. O2,pr,mix Primary air oxygen supply flow rate v O2,pr,in Therefore, the oxygen concentration and primary air supply flow rate after primary air oxygenation can be obtained directly from the primary air oxygenation parameters.

[0155] For example, the secondary air oxygen injection parameters can be, but are not limited to, those collected by sensors preset in the secondary air duct of an oxygen-enriched combustion boiler. These parameters include, but are not limited to, the oxygen concentration r after secondary air oxygen injection. O2,se,mix and secondary air oxygen supply flow rate v O2,se,in Therefore, the oxygen concentration and oxygen supply flow rate after secondary air oxygenation can be obtained directly from the secondary air oxygenation parameters.

[0156] For example, the oxygen injection parameters for the drying air can be, but are not limited to, those collected by sensors preset in the drying air duct of an oxygen-enriched combustion boiler. These parameters include, but are not limited to, the oxygen concentration r after the drying air is injected. O2,vent,mix and dry air oxygen supply flow rate v O2,vent,in Therefore, the oxygen concentration and oxygen supply flow rate of the dried air after oxygenation can be obtained directly from the oxygenation parameters of the dried air.

[0157] For example, the unit of the above flow rate can be, but is not limited to, meters. 3 / s.

[0158] For example, the recirculated flue gas volume is the volume of flue gas passing through the flue gas recirculation pipeline in an oxygen-enriched combustion boiler.

[0159] The above steps yield the recirculated flue gas volume V2 corresponding to a unit mass of received base coal. This reduces the cost of determining the recirculated flue gas volume corresponding to a unit mass of received base coal while further enabling the determination of the recirculated flue gas volume based on multiple parameters closely related to the recirculated flue gas volume (determined by the structure and relevant physical and chemical properties of the existing oxygen-enriched combustion boiler). This improves the accuracy of the determined recirculated flue gas volume corresponding to a unit mass of received base coal.

[0160] In one alternative implementation, such as Figure 5 As shown, the step of obtaining the water vapor concentration at the air preheater outlet based on the recirculated flue gas volume, water vapor concentration detected at the flue gas recirculation extraction point, exhaust volume, condensate vapor volume, atmospheric parameters, received base coal parameters, total boiler air leakage, and carbon dioxide concentration detected at the air preheater outlet and the flue gas recirculation extraction point includes:

[0161] S501: Obtain the absolute humidity of the atmosphere based on the atmospheric parameters.

[0162] S502: Based on the received base coal parameters, obtain the hydrogen element quality index and moisture quality index of the received base coal.

[0163] S503: Based on the hydrogen quality index, moisture quality index, absolute atmospheric humidity, recirculated flue gas volume, water vapor concentration detected at the flue gas recirculation extraction point, exhaust volume, condensate steam volume, total boiler air leakage, air preheater outlet, and carbon dioxide concentration detected at the flue gas recirculation extraction point, the water vapor concentration at the air preheater outlet is obtained.

[0164] For example, obtaining the absolute humidity of the atmosphere based on the atmospheric parameters is a conventional technique in this field and will not be described in detail here.

[0165] For example, obtaining the hydrogen and moisture quality indicators of the received base coal based on the received base coal parameters is a conventional technique in this field and will not be elaborated here.

[0166] For example, the carbon dioxide concentration r detected at the outlet of the air preheater CO2,out,AH , is the carbon dioxide concentration of the flue gas at the air preheater outlet, which can be detected by a concentration sensor installed at the air preheater outlet.

[0167] The above steps overcome the problem that the water vapor concentration at the air preheater outlet is not easy to measure directly. Moreover, the above steps process parameters that are closely related to the physicochemical properties of the water vapor concentration at the air preheater outlet to obtain the water vapor concentration, which can improve the accuracy of the obtained water vapor concentration, thereby improving the accuracy of the flue gas loss obtained in subsequent steps.

[0168] In an optional implementation, the step of calculating the flue gas loss of the oxygen-enriched combustion boiler based on the atmospheric parameters, the carbon dioxide concentration detected at the flue gas recirculation extraction point, the oxygen concentration detected at the flue gas recirculation extraction point, the water vapor concentration detected at the flue gas recirculation extraction point, the water vapor concentration at the air preheater outlet, the carbon dioxide concentration detected at the air preheater outlet, the oxygen concentration detected at the air preheater outlet, the condensate steam volume, the exhaust volume, the recirculated flue gas volume, the oxygen injection volume, the specific heat capacity parameter, the total air leakage volume, the combustion parameters, and the detected temperature parameters includes:

[0169] Based on the atmospheric parameters, the absolute humidity of the atmosphere is obtained;

[0170] Based on the combustion parameters, the solid incomplete combustion loss and the lower heating value of coal are obtained;

[0171] Based on the specific heat capacity parameters, the specific heat capacity of oxygen, air, and water are obtained.

[0172] Based on the temperature parameters, the gas temperature at the air preheater outlet, the gas temperature at the flue gas recirculation extraction point, the oxygen injection temperature, and the atmospheric temperature are obtained.

[0173] The exhaust losses of the oxygen-enriched combustion boiler are calculated based on the absolute atmospheric humidity, incomplete combustion loss of solids, lower heating value of coal, specific heat capacity of oxygen, specific heat capacity of air, specific heat capacity of water, gas temperature at the air preheater outlet, gas temperature at the flue gas recirculation extraction point, temperature of injected oxygen, atmospheric temperature, carbon dioxide concentration detected at the flue gas recirculation extraction point, oxygen concentration detected at the flue gas recirculation extraction point, water vapor concentration detected at the flue gas recirculation extraction point, water vapor concentration at the air preheater outlet, carbon dioxide concentration detected at the air preheater outlet, oxygen concentration detected at the air preheater outlet, condensate steam volume, exhaust volume, recirculated flue gas volume, oxygen injection volume, and total air leakage.

[0174] For example, obtaining the absolute humidity of the atmosphere based on the atmospheric parameters is a conventional technique in this field and will not be described in detail here.

[0175] For example, the combustion parameters include, but are not limited to, the incomplete combustion loss of solids q4 and the lower heating value of coal Q. ar,net Therefore, the incomplete combustion loss of solids and the lower heating value of coal can be directly obtained from the combustion parameters. The incomplete combustion loss of solids and the lower heating value of coal can be directly obtained or collected by those skilled in the art.

[0176] For example, the specific heat capacity parameter includes, but is not limited to, the specific heat capacity of oxygen. specific heat capacity of air c air Specific heat capacity of water Therefore, the specific heat capacity of oxygen, air, and water can be obtained directly from the specific heat capacity parameters, and the specific heat capacity can be obtained directly by those skilled in the art.

[0177] For example, the temperature parameters include, but are not limited to, the gas temperature t at the air preheater outlet. gas,out,AH The gas temperature t at the flue gas recirculation extraction point gas,imax The temperature t of the injected oxygen O2,in and atmospheric temperature t air The temperatures mentioned above can be obtained through methods including but not limited to temperature sensors and air temperature monitoring devices, which are conventional technical means in this field and will not be described in detail here.

[0178] By following the steps described above, it becomes feasible to determine the flue gas losses of oxy-fuel boilers. Simultaneously, by minimizing the number of parameters required for the determination process, the number and scale of equipment needed for determining flue gas losses are reduced, effectively lowering the cost. Furthermore, since the inputs used in determining flue gas losses are closely related to their thermophysical and chemical properties and primarily consider the structure and gas flow relationships of the oxy-fuel boiler, the accuracy of the determined flue gas losses can be improved.

[0179] In an optional implementation, the step of obtaining the total boiler air leakage per unit mass of received base coal based on the carbon, hydrogen, oxygen, nitrogen, sulfur, and moisture content of the received base coal, as well as the absolute atmospheric humidity, oxygen purity, carbon dioxide concentration detected at the flue gas recirculation extraction point, oxygen concentration detected at the flue gas recirculation extraction point, and water vapor concentration detected at the flue gas recirculation extraction point, includes:

[0180] Based on the aforementioned carbon, hydrogen, nitrogen, sulfur, and moisture quality indicators, the amount of flue gas required for the complete combustion of a unit mass of received base coal is obtained.

[0181] Based on the aforementioned carbon, hydrogen, sulfur, and oxygen quality indicators, the theoretical amount of oxygen required for the complete combustion of a unit mass of received base coal is obtained.

[0182] Based on the amount of flue gas required for complete combustion of a unit mass of received base coal, the theoretical amount of oxygen required for complete combustion of a unit mass of received base coal, the carbon element quality index, the hydrogen element quality index, the moisture quality index, the oxygen injection purity, the oxygen concentration detected at the flue gas recirculation extraction point, the carbon dioxide concentration detected at the flue gas recirculation extraction point, the water vapor concentration detected at the flue gas recirculation extraction point, and the absolute humidity of the atmosphere, the total boiler air leakage corresponding to a unit mass of received base coal is obtained.

[0183] For example, the step of basing the carbon element quality index C ar Hydrogen element quality index H ar Nitrogen element quality index N ar Sulfur element quality index S ar and moisture quality index M ar The amount of flue gas obtained per unit mass of base coal from complete combustion This can be achieved through, but is not limited to, the following formula:

[0184]

[0185] The amount of flue gas generated by the complete combustion of base coal per unit mass can be, but is not limited to, the volume of flue gas generated by the complete combustion of 1 kg of base coal under standard conditions.

[0186] It should be noted that the specific method for obtaining the amount of flue gas from the complete combustion of base coal per unit mass can be determined by those skilled in the art based on the actual situation. The above description is only an example and does not constitute a limitation.

[0187] By following the steps above, the amount of flue gas produced by the complete combustion of a unit mass of received base coal can be calculated using relevant chemical properties. This improves the accuracy of the obtained flue gas volume, thereby enhancing the efficiency of subsequent steps. The accuracy of the parameters obtained as input.

[0188] For example, the step of basing the carbon element quality index C ar Hydrogen element quality index H ar Sulfur element quality index S ar And oxygen element quality index O ar The theoretical amount of oxygen required for the complete combustion of a unit mass of base coal is obtained. This can be achieved through, but is not limited to, the following formula:

[0189]

[0190] The theoretical amount of oxygen required for the complete combustion of a unit mass of received base coal can be, but is not limited to, the theoretical oxygen volume required for the complete combustion of 1 kg of received base coal.

[0191] It should be noted that the specific method for obtaining the theoretical amount of oxygen required for the complete combustion of a unit mass of base coal can be determined by those skilled in the art based on the actual situation. The above description is only an example and does not constitute a limitation.

[0192] The above steps are also based on calculations performed using relevant chemical properties. Therefore, it can improve the results. This improves the accuracy of subsequent steps. The accuracy of the parameters obtained as input.

[0193] The total boiler air leakage per unit mass of received base coal is calculated based on the flue gas volume from complete combustion of the received base coal, the theoretical oxygen consumption required for complete combustion of the received base coal, carbon element quality index, hydrogen element quality index, moisture quality index, oxygen injection purity, oxygen concentration detected at the flue gas recirculation extraction point, carbon dioxide concentration detected at the flue gas recirculation extraction point, water vapor concentration detected at the flue gas recirculation extraction point, and atmospheric absolute humidity. This calculation is based on the gas flow characteristics and structure of an oxygen-enriched combustion boiler, as well as its relevant thermophysical and chemical properties. Therefore, all the above input variables are closely related to the total boiler air leakage per unit mass of received base coal, thereby improving the accuracy of the determined total boiler air leakage and minimizing the use of parameters that require measuring equipment, thus reducing the number of measuring devices needed and consequently reducing costs.

[0194] In an optional implementation, the step of obtaining the total boiler air leakage per unit mass of received base coal based on the amount of flue gas from the complete combustion of the received base coal, the theoretical amount of oxygen required for the complete combustion of the received base coal, the carbon element quality index, the hydrogen element quality index, the moisture quality index, the oxygen injection purity, the oxygen concentration detected at the flue gas recirculation extraction point, the carbon dioxide concentration detected at the flue gas recirculation extraction point, the water vapor concentration detected at the flue gas recirculation extraction point, and the absolute humidity of the atmosphere includes:

[0195] Based on the amount of flue gas from the complete combustion of a unit mass of received base coal, the theoretical amount of oxygen required for the complete combustion of a unit mass of received base coal, the carbon element quality index, the hydrogen element quality index, the moisture quality index, the oxygen injection purity, the oxygen concentration detected at the flue gas recirculation extraction point, the carbon dioxide concentration detected at the flue gas recirculation extraction point, and the water vapor concentration detected at the flue gas recirculation extraction point, the amount of nitrogen in the total boiler air leakage corresponding to a unit mass of received base coal is obtained.

[0196] Based on the oxygen purity and absolute atmospheric humidity, the proportion of nitrogen in the total boiler air leakage corresponding to a unit mass of received base coal is obtained.

[0197] Based on the nitrogen quantity and the nitrogen quantity ratio, the total boiler air leakage corresponding to a unit mass of received base coal is obtained.

[0198] For example, the total boiler air leakage corresponding to the unit mass of base coal received. It can be determined by, but is not limited to, the following formula:

[0199]

[0200] The variables are defined as follows: the amount of flue gas produced by the complete combustion of a unit mass of base coal. The theoretical amount of oxygen required for the complete combustion of a unit mass of base coal Carbon element quality index C ar Hydrogen element quality index H ar Moisture quality index M ar Oxygen purity x, oxygen concentration detected at the flue gas recirculation extraction point. The carbon dioxide concentration detected at the flue gas recirculation extraction point The water vapor concentration detected at the flue gas recirculation extraction point absolute humidity of the atmosphere d k .

[0201] For example, the amount of nitrogen in the total boiler air leakage corresponding to the unit mass of base coal received is the numerator in the above formula:

[0202]

[0203] For example, the proportion of nitrogen in the total boiler air leakage corresponding to the unit mass of base coal received is the denominator in the above formula:

[0204]

[0205] It should be noted that the specific implementation method for obtaining the total boiler air leakage corresponding to the unit mass of received base coal can be determined by those skilled in the art based on the actual situation. The above description is only an example and does not constitute a limitation.

[0206] The total boiler air leakage corresponding to a unit mass of received base coal obtained through the above steps is also based on the relevant physicochemical properties, the gas flow characteristics of the oxy-fuel combustion boiler, and the structure of the oxy-fuel combustion boiler. Therefore, it can improve the accuracy of the total boiler air leakage corresponding to a unit mass of received base coal, thereby improving the accuracy of the flue gas loss determined in subsequent steps. It also achieves the goal of using as few parameters as possible that require measuring equipment, thereby reducing the number of measuring devices required and thus reducing costs.

[0207] In an optional implementation, the step of obtaining the oxygen injection amount per unit mass of received base coal based on the oxygen injection purity, carbon element quality index, hydrogen element quality index, oxygen element quality index, sulfur element quality index, carbon dioxide concentration detected at the flue gas recirculation extraction point, oxygen concentration detected at the flue gas recirculation extraction point, absolute atmospheric humidity, and total boiler air leakage includes:

[0208] Based on the carbon element quality index, the oxygen concentration detected at the flue gas recirculation extraction point, and the carbon dioxide concentration detected at the flue gas recirculation extraction point, the oxygen content of the chimney exhaust corresponding to a unit mass of received base coal is obtained.

[0209] Based on the absolute atmospheric humidity and the total air leakage of the boiler, the amount of additional oxygen brought in by the air leakage per unit mass of received base coal is obtained.

[0210] Based on the aforementioned carbon, hydrogen, sulfur, and oxygen quality indicators, the theoretical amount of oxygen required for the complete combustion of a unit mass of received base coal is obtained.

[0211] Based on the oxygen content in the chimney exhaust, the additional oxygen due to air leakage, the theoretical oxygen required for complete combustion, and the purity of the injected oxygen, the amount of oxygen injected per unit mass of received base coal is obtained.

[0212] For example, the oxygen injection amount corresponding to the unit mass of base coal received. It can be determined by, but is not limited to, the following formula:

[0213]

[0214] The variables are defined as follows: carbon element quality index C. ar Oxygen concentration detected at the flue gas recirculation extraction point The carbon dioxide concentration detected at the flue gas recirculation extraction point absolute humidity of the atmosphere d k Total air leakage of boiler The theoretical amount of oxygen required for the complete combustion of a unit mass of base coal Oxygen purity x.

[0215] It should be noted that the determination of the amount of oxygen injected per unit mass of received base coal can be made by those skilled in the art based on the actual situation. The above description is only an example and does not constitute a limitation.

[0216] For example, the amount of additional oxygen received per unit mass of base coal due to air leakage is given by the formula above.

[0217] For example, the specific implementation method of obtaining the theoretical amount of oxygen required for the complete combustion of a unit mass of received base coal based on the carbon element quality index, hydrogen element quality index, sulfur element quality index and oxygen element quality index has been described in the embodiments of the present invention, and will not be repeated here.

[0218] For example, the oxygen content in the flue gas emitted from the chimney corresponding to the unit mass of received base coal is given by the formula above.

[0219] The oxygen injection amount corresponding to a unit mass of received base coal obtained through the above steps is also based on the relevant physicochemical properties, the gas flow characteristics of the oxygen-enriched combustion boiler, and the structure of the oxygen-enriched combustion boiler. Therefore, it can improve the accuracy of the oxygen injection amount corresponding to a unit mass of received base coal, thereby improving the accuracy of the flue gas loss determined in subsequent steps. It also achieves the goal of using as few parameters as possible that require measuring equipment, thereby reducing the number of measuring devices required and thus reducing costs.

[0220] In an optional implementation, the step of obtaining the amount of condensed water vapor per unit mass of received base coal based on the hydrogen quality index, moisture quality index, absolute atmospheric humidity, total boiler air leakage, flue gas volume, and water vapor concentration detected at the flue gas recirculation extraction point includes:

[0221] Based on the hydrogen element quality index and moisture quality index, the amount of water vapor generated per unit mass of received base coal combustion is obtained;

[0222] Based on the absolute atmospheric humidity and the total air leakage of the boiler, the amount of water vapor in the air leakage corresponding to a unit mass of received base coal is obtained.

[0223] Based on the flue gas volume and the water vapor concentration detected at the flue gas recirculation extraction point, the amount of water vapor in the flue gas of the boiler corresponding to a unit mass of received base coal is obtained.

[0224] The amount of condensed water vapor per unit mass of received base coal is obtained based on the amount of water vapor generated by the combustion of base coal per unit mass, the amount of water vapor in the leaked air corresponding to the base coal per unit mass, and the amount of water vapor in the flue gas of the boiler exhaust corresponding to the base coal per unit mass.

[0225] For example, the amount of condensed water vapor corresponding to the unit mass of base coal received. It can be determined by, but is not limited to, the following formula:

[0226]

[0227] The variables are defined as follows: hydrogen element quality index H ar Moisture quality index M ar Absolute humidity of the atmosphere d k Total air leakage of boiler The exhaust volume V3 and the water vapor concentration detected at the flue gas recirculation extraction point

[0228] It should be noted that the amount of condensed water vapor corresponding to a unit mass of base coal received can be determined by those skilled in the art based on the actual situation. The above description is only an example and does not constitute a limitation.

[0229] For example, the amount of water vapor generated per unit mass of base coal combustion is 0.111H + 0.0124M in the above formula.

[0230] ar ar

[0231] For example, the amount of water vapor in the leaked air corresponding to the unit mass of received base coal is given by the formula above.

[0232] For example, the amount of water vapor in the flue gas from the boiler exhaust corresponding to the unit mass of received base coal is given by the formula above.

[0233] The condensate vapor content per unit mass of received coal obtained through the above steps is also based on relevant physicochemical properties, the gas flow characteristics of the oxy-fuel boiler, and the boiler's structure. Therefore, it improves the accuracy of the condensate vapor content per unit mass of received coal, thereby improving the accuracy of the flue gas loss determined in subsequent steps. Furthermore, it minimizes the use of parameters requiring measuring equipment, thus reducing the number of measuring devices needed and consequently lowering costs. Moreover, it overcomes the problem that condensate vapor content is not easily measured directly using measuring equipment.

[0234] In an optional implementation, the step of obtaining the recirculated flue gas volume corresponding to the unit mass of received base coal based on the oxygen concentration after primary air oxygen injection, the primary air oxygen supply flow rate, the oxygen concentration after secondary air oxygen injection, the secondary air oxygen supply flow rate, the oxygen concentration after drying air oxygen injection, the drying air oxygen supply flow rate, the oxygen injection volume corresponding to the unit mass of received base coal, the oxygen injection purity, and the oxygen concentration detected at the flue gas recirculation extraction point includes:

[0235] Based on the oxygen injection amount corresponding to the unit mass of received base coal, the oxygen concentration after primary air oxygen injection, the oxygen injection purity, the oxygen concentration detected at the flue gas recirculation extraction point, the primary air oxygen supply flow rate, the secondary air oxygen supply flow rate, and the drying air oxygen supply flow rate, the amount of recirculated flue gas before primary air oxygen injection in the recirculated flue gas corresponding to the unit mass of received base coal is obtained.

[0236] Based on the oxygen injection amount corresponding to the unit mass of base coal received, the oxygen concentration after secondary air oxygen injection, the oxygen injection purity, the oxygen concentration detected at the flue gas recirculation extraction point, the primary air oxygen supply flow rate, the secondary air oxygen supply flow rate, and the drying air oxygen supply flow rate, the amount of recirculated flue gas before secondary air oxygen injection in the recirculated flue gas corresponding to the unit mass of base coal received is obtained.

[0237] Based on the oxygen injection amount corresponding to the unit mass of base coal received, the oxygen concentration after oxygen injection of dry air, the oxygen injection purity, the oxygen concentration detected at the flue gas recirculation extraction point, the primary air oxygen supply flow rate, the secondary air oxygen supply flow rate, and the dry air oxygen supply flow rate, the amount of recirculated flue gas before oxygen injection of dry air in the recirculated flue gas corresponding to the unit mass of base coal received is obtained.

[0238] The amount of recirculated flue gas corresponding to a unit mass of received base coal is obtained based on the amount of recirculated flue gas before primary air oxygen injection, the amount of recirculated flue gas before secondary air oxygen injection, and the amount of recirculated flue gas before drying air oxygen injection in the recirculated flue gas corresponding to the unit mass of received base coal.

[0239] For example, the amount of recirculated flue gas V2 corresponding to the unit mass of base coal received can be determined by, but is not limited to, the following formula:

[0240]

[0241] The variables are defined as follows: the amount of oxygen injected per unit mass of base coal received. Oxygen concentration after primary air oxygenation Oxygen purity x, oxygen concentration detected at the flue gas recirculation extraction point Primary air oxygen supply flow rate Secondary air oxygen supply flow rate Dry air oxygen supply flow rate Oxygen concentration after secondary air oxygenation Oxygen concentration after oxygen injection into dry air

[0242] It should be noted that the determination of the amount of recirculated flue gas corresponding to the unit mass of base coal received can be determined by those skilled in the art based on the actual situation. The above description is only an example and does not constitute a limitation.

[0243] For example, the amount of circulating flue gas before primary air oxygen injection in the recirculated flue gas corresponding to the unit mass of base coal received is given by the formula above.

[0244] For example, the amount of recirculated flue gas before secondary air oxygen injection in the recirculated flue gas corresponding to the unit mass of base coal received is given by the formula above.

[0245] For example, the amount of recirculated flue gas before oxygen injection in the recirculated flue gas corresponding to the unit mass of base coal is given by the formula above.

[0246] The recirculated flue gas volume corresponding to a unit mass of received base coal obtained through the above steps is also based on the relevant physicochemical properties, the gas flow characteristics of the oxy-fuel combustion boiler, and the structure of the oxy-fuel combustion boiler. Therefore, it can improve the accuracy of the recirculated flue gas volume corresponding to a unit mass of received base coal, thereby improving the accuracy of the flue gas loss determined in subsequent steps. It also achieves the goal of using as few parameters as possible that require measuring equipment, thereby reducing the number of measuring devices required and thus reducing costs.

[0247] In an optional implementation, the step of obtaining the water vapor concentration at the air preheater outlet based on the hydrogen quality index, moisture quality index, absolute atmospheric humidity, recirculated flue gas volume, water vapor concentration detected at the flue gas recirculation extraction point, exhaust volume, condensate steam volume, total boiler air leakage, air preheater outlet, and carbon dioxide concentration detected at the flue gas recirculation extraction point includes:

[0248] Based on the recirculated flue gas volume and the water vapor concentration detected at the flue gas recirculation extraction point, the water vapor content in the recirculated flue gas corresponding to a unit mass of received base coal is obtained.

[0249] Based on the hydrogen element quality index and moisture quality index, the amount of water vapor obtained per unit mass of received base coal combustion is obtained.

[0250] Based on the condensate steam volume, flue gas volume, recirculated flue gas volume, carbon dioxide concentration detected at the flue gas recirculation extraction point, carbon dioxide concentration detected at the air preheater outlet, atmospheric absolute humidity, and total boiler air leakage, the amount of water vapor in the air leakage from the furnace to the air preheater corresponding to a unit mass of received base coal is obtained.

[0251] Based on the recirculated flue gas volume, condensate vapor volume, exhaust volume, carbon dioxide concentration detected at the flue gas recirculation extraction point, and carbon dioxide concentration detected at the air preheater outlet, the flue gas volume corresponding to the air preheater flue for a unit mass of received base coal is obtained.

[0252] The water vapor concentration at the air preheater outlet is obtained based on the amount of water vapor in the recirculated flue gas corresponding to the unit mass of received base coal, the amount of water vapor obtained from the combustion of the unit mass of received base coal, the amount of water vapor in the air leakage from the furnace to the air preheater corresponding to the unit mass of received base coal, and the amount of flue gas in the air preheater flue corresponding to the unit mass of received base coal.

[0253] For example, the water vapor concentration at the outlet of the air preheater It can be determined by, but is not limited to, the following formula:

[0254]

[0255] The variables are defined as follows: hydrogen element quality index H ar Moisture quality index M ar Absolute humidity of the atmosphere d k The amount of recirculated flue gas (V2) and the water vapor concentration detected at the flue gas recirculation extraction point. Smoke volume V3, condensate vapor volume Total air leakage of boiler Carbon dioxide concentration detected at the air preheater outlet The carbon dioxide concentration detected at the flue gas recirculation extraction point

[0256] It should be noted that the determination of the water vapor concentration at the outlet of the air preheater can be made by those skilled in the art based on the actual situation. The above description is only an example and does not constitute a limitation.

[0257] For example, the amount of water vapor contained in the recirculated flue gas corresponding to the unit mass of received base coal is given by the formula above.

[0258] For example, the amount of water vapor obtained from the combustion of the base coal per unit mass is 0.111H in the above formula. ar +0.0124M ar .

[0259] For example, the amount of water vapor in the air leakage from the furnace to the air preheater corresponding to the unit mass of base coal received is given by the formula above.

[0260] For example, the flue gas volume of the air preheater flue corresponding to the unit mass of base coal received is the denominator in the above formula.

[0261] The water vapor concentration at the air preheater outlet obtained through the above steps is also based on relevant physicochemical properties, the gas flow characteristics of the oxy-fuel boiler, and the boiler's structure. Therefore, it improves the accuracy of the obtained water vapor concentration at the air preheater outlet, thereby improving the accuracy of the flue gas loss determined in subsequent steps. Furthermore, it minimizes the use of parameters requiring measuring equipment, thus reducing the number of measuring devices needed and consequently lowering costs. Moreover, it overcomes the problem that the water vapor concentration at the air preheater outlet is difficult to measure directly using measuring equipment.

[0262] In an optional implementation, the step of obtaining the amount of water vapor in the air leakage from the furnace to the air preheater corresponding to a unit mass of received base coal, based on the condensate steam volume, flue gas volume, recirculated flue gas volume, carbon dioxide concentration detected at the flue gas recirculation extraction point, carbon dioxide concentration detected at the air preheater outlet, atmospheric absolute humidity, and total boiler air leakage, includes:

[0263] Based on the amount of condensed water vapor, the amount of flue gas, the amount of recirculated flue gas, the carbon dioxide concentration detected at the flue gas recirculation extraction point, and the carbon dioxide concentration detected at the air preheater outlet, the air leakage between the air preheater and the flue gas recirculation extraction point corresponding to a unit mass of received base coal is obtained.

[0264] Based on the total air leakage of the boiler and the air leakage between the air preheater and the flue gas recirculation extraction point corresponding to the unit mass of received base coal, the air leakage from the furnace to the air preheater corresponding to the unit mass of received base coal is obtained.

[0265] The amount of water vapor in the air leakage from the furnace to the air preheater corresponding to the unit mass of received base coal is obtained based on the air leakage from the furnace to the air preheater corresponding to the unit mass of received base coal and the absolute humidity of the atmosphere.

[0266] For example, the leakage between the air preheater and the flue gas recirculation extraction point corresponding to a unit mass of received base coal is obtained based on the amount of condensate vapor, flue gas discharge, recirculated flue gas volume, carbon dioxide concentration detected at the flue gas recirculation extraction point, and carbon dioxide concentration detected at the air preheater outlet. This can be achieved through, but is not limited to, the following formula:

[0267]

[0268] The variables are defined as follows: condensate vapor volume Exhaust volume V3, recirculated flue gas volume V2, and carbon dioxide concentration detected at the flue gas recirculation extraction point. Carbon dioxide concentration detected at the air preheater outlet

[0269] It should be noted that the determination of the air leakage between the air preheater and the flue gas recirculation extraction point corresponding to the unit mass of base coal received can be determined by those skilled in the art based on the actual situation. The above description is only an example and does not constitute a limitation.

[0270] For example, the step of obtaining the air leakage from the furnace to the air preheater based on the total air leakage of the boiler and the air leakage between the air preheater and the flue gas recirculation extraction point corresponding to the unit mass of received base coal can be, but is not limited to, the following:

[0271] For example, the step of obtaining the amount of water vapor in the air leakage from the furnace to the air preheater based on the air leakage from the furnace to the air preheater corresponding to the unit mass of received base coal and the absolute humidity of the atmosphere can be, but is not limited to, the following:

[0272] Wherein, the absolute humidity of the atmosphere is d k The total air leakage of the boiler is

[0273] By following the steps above, the accuracy of the amount of water vapor in the leaked air from the furnace to the air preheater corresponding to the unit mass of base coal can be improved, thereby further improving the accuracy of the water vapor concentration at the outlet of the air preheater.

[0274] In an optional implementation, the step of obtaining the flue gas volume in the air preheater flue corresponding to a unit mass of received base coal based on the recirculated flue gas volume, condensate vapor volume, exhaust volume, carbon dioxide concentration detected at the flue gas recirculation extraction point, and carbon dioxide concentration detected at the air preheater outlet includes:

[0275] Based on the amount of condensed water vapor, the amount of flue gas, the amount of recirculated flue gas, the carbon dioxide concentration detected at the flue gas recirculation extraction point, and the carbon dioxide concentration detected at the air preheater outlet, the air leakage between the air preheater and the flue gas recirculation extraction point corresponding to a unit mass of received base coal is obtained.

[0276] The flue gas volume of the air preheater flue corresponding to the unit mass of received base coal is obtained based on the recirculated flue gas volume, condensate vapor volume, exhaust volume, and the air leakage between the air preheater and the flue gas recirculation extraction point corresponding to the unit mass of received base coal.

[0277] For example, the method of obtaining the air leakage between the air preheater and the flue gas recirculation extraction point based on the amount of condensed water vapor, the amount of flue gas exhaust, the amount of recirculated flue gas, the carbon dioxide concentration detected at the flue gas recirculation extraction point, and the carbon dioxide concentration detected at the air preheater outlet for a unit mass of received base coal has been described in the embodiments of the present invention and will not be repeated here.

[0278] For example, the step of obtaining the flue gas volume of the air preheater duct corresponding to the unit mass of received base coal based on the recirculated flue gas volume, condensate vapor volume, exhaust volume, and the air leakage between the air preheater and the flue gas recirculation extraction point corresponding to the unit mass of received base coal can be, but is not limited to, the following:

[0279] By following the steps above, the accuracy of the flue gas volume in the air preheater duct corresponding to the unit mass of received base coal can be improved, thereby further improving the accuracy of the water vapor concentration at the air preheater outlet.

[0280] In an optional implementation, the step of obtaining the flue gas loss of the oxygen-enriched combustion boiler based on the absolute atmospheric humidity, incomplete combustion loss of solids, lower heating value of coal, specific heat capacity of oxygen, specific heat capacity of air, specific heat capacity of water, gas temperature at the air preheater outlet, gas temperature at the flue gas recirculation extraction point, temperature of injected oxygen, atmospheric temperature, carbon dioxide concentration detected at the flue gas recirculation extraction point, oxygen concentration detected at the flue gas recirculation extraction point, water vapor concentration detected at the flue gas recirculation extraction point, water vapor concentration at the air preheater outlet, carbon dioxide concentration detected at the air preheater outlet, oxygen concentration detected at the air preheater outlet, condensate steam volume, flue gas volume, recirculated flue gas volume, oxygen injection volume, and total air leakage includes:

[0281] Based on the amount of condensed water vapor, the amount of flue gas, the amount of recirculated flue gas, the carbon dioxide concentration detected at the flue gas recirculation extraction point, and the carbon dioxide concentration detected at the air preheater outlet, the air leakage between the air preheater and the flue gas recirculation extraction point corresponding to a unit mass of received base coal is obtained.

[0282] Based on the total air leakage and the air leakage between the air preheater and the flue gas recirculation extraction point corresponding to the unit mass of received base coal, the air leakage from the furnace to the air preheater corresponding to the unit mass of received base coal is obtained.

[0283] The specific heat capacity of the gas at the outlet of the air preheater is obtained based on the water vapor concentration at the outlet of the air preheater, the carbon dioxide concentration detected at the outlet of the air preheater, and the oxygen concentration detected at the outlet of the air preheater.

[0284] The specific heat capacity of the gas at the flue gas recirculation extraction point is obtained based on the water vapor concentration, carbon dioxide concentration, and oxygen concentration detected at the flue gas recirculation extraction point.

[0285] Based on the condensate steam volume, flue gas volume, recirculated flue gas volume, air leakage between the air preheater and the flue gas recirculation extraction point, the specific heat capacity of the gas at the air preheater outlet, and the gas temperature at the air preheater outlet, the enthalpy of the boiler main flue gas corresponding to a unit mass of received base coal is obtained.

[0286] Based on the recirculated flue gas volume, the specific heat capacity of the gas at the flue gas recirculation extraction point, and the gas temperature at the flue gas recirculation extraction point, the enthalpy of the recirculated flue gas corresponding to a unit mass of received base coal is obtained.

[0287] Based on the oxygen injection volume, the specific heat capacity of oxygen, and the temperature of the injected oxygen, the enthalpy of the injected oxygen corresponding to a unit mass of received base coal is obtained.

[0288] Based on the specific heat capacity of the air, the temperature of the atmosphere, the absolute humidity of the atmosphere, and the air leakage from the furnace to the air preheater, the enthalpy of the dry air in the air leakage from the furnace to the air preheater corresponding to a unit mass of received base coal is obtained.

[0289] Based on the specific heat capacity of water, atmospheric temperature, atmospheric absolute humidity, and air leakage from the furnace to the air preheater, the enthalpy of water vapor in the air leakage from the furnace to the air preheater corresponding to a unit mass of received base coal is obtained.

[0290] The exhaust gas loss of an oxygen-enriched combustion boiler is obtained based on the enthalpy of the main flue gas in the boiler corresponding to a unit mass of received base coal, the enthalpy of the circulating flue gas corresponding to a unit mass of received base coal, the enthalpy of the injected oxygen corresponding to a unit mass of received base coal, the enthalpy of the dry air in the leaked air from the furnace to the air preheater corresponding to a unit mass of received base coal, the enthalpy of the water vapor in the leaked air from the furnace to the air preheater corresponding to a unit mass of received base coal, the incomplete combustion loss of solids, and the lower heating value of coal.

[0291] For example, the flue gas loss q2 of the oxygen-enriched combustion boiler can be determined by, but is not limited to, the following formula:

[0292]

[0293] The variables are defined as follows: absolute atmospheric humidity d k 1. Incomplete combustion loss of solids q4; 2. Lower heating value of coal Q ar,net Specific heat capacity of oxygen specific heat capacity of air c air Specific heat capacity of water The gas temperature t at the air preheater outlet gas,out,AH The gas temperature t at the flue gas recirculation extraction point gas,imax Temperature of injected oxygen Atmospheric temperature t air The carbon dioxide concentration detected at the flue gas recirculation extraction point The oxygen concentration detected at the flue gas recirculation extraction point The water vapor concentration r detected at the flue gas recirculation extraction point c H2O The water vapor concentration at the outlet of the air preheater Carbon dioxide concentration detected at the air preheater outlet The oxygen concentration r detected at the air preheater outlet O2,out,AH The amount of condensed water vapor Exhaust volume V3, recirculated flue gas volume V2, oxygen injection volume Total air leakage

[0294] For example, the method of obtaining the air leakage between the air preheater and the flue gas recirculation extraction point based on the amount of condensed water vapor, the amount of flue gas exhaust, the amount of recirculated flue gas, the carbon dioxide concentration detected at the flue gas recirculation extraction point, and the carbon dioxide concentration detected at the air preheater outlet for a unit mass of received base coal has been described in the embodiments of the present invention and will not be repeated here.

[0295] For example, the step of obtaining the air leakage from the furnace to the air preheater corresponding to the unit mass of received base coal based on the total air leakage and the air leakage between the air preheater and the flue gas recirculation extraction point corresponding to the unit mass of received base coal has been described in the embodiments of the present invention and will not be repeated here.

[0296] For example, the enthalpy of the boiler main flue gas corresponding to the unit mass of received base coal is given by the formula above.

[0297] For example, the enthalpy of the circulating flue gas corresponding to the unit mass of received base coal is V2c in the above formula. gas, imax t gas,imax .

[0298] For example, the enthalpy of the injected oxygen per unit mass of base coal received is given by the formula above.

[0299] For example, the enthalpy of the dry air leaked from the furnace to the air preheater corresponding to the unit mass of base coal is given by the formula above.

[0300] For example, the enthalpy of water vapor in the leaked air from the furnace to the air preheater corresponding to the unit mass of base coal is given by the formula above.

[0301] The formula (100-q4) is a correction parameter set to account for the situation where a unit mass of received base coal cannot be completely burned during combustion, and some carbon elements in the received base coal will inevitably not participate in the combustion.

[0302] The determination of flue gas losses in oxy-fuel boilers through the above steps is achieved by closely combining the boiler's structure, gas flow characteristics, and relevant physical and chemical properties. Therefore, it not only makes determining flue gas losses feasible but also ensures high accuracy, overcoming the problem of the lack of a standard method for determining flue gas losses in existing technologies. Furthermore, the above steps minimize the number of parameters required for the determination process, thereby reducing the number and scale of equipment needed to determine flue gas losses and effectively lowering the cost.

[0303] In an optional embodiment, obtaining the specific heat capacity of the gas at the air preheater outlet based on the water vapor concentration, carbon dioxide concentration detected at the air preheater outlet, and oxygen concentration detected at the air preheater outlet includes:

[0304] The nitrogen concentration at the air preheater outlet is obtained based on the water vapor concentration, carbon dioxide concentration, and oxygen concentration detected at the air preheater outlet.

[0305] Based on the water vapor concentration, carbon dioxide concentration, and oxygen concentration detected at the air preheater outlet, the nitrogen concentration at the air preheater outlet is obtained, and the specific heat capacity of water vapor, carbon dioxide, oxygen, and nitrogen at the air preheater outlet are obtained respectively.

[0306] The specific heat capacity of the gas at the outlet of the air preheater is obtained based on the specific heat capacity of water vapor at the outlet of the air preheater, the specific heat capacity of carbon dioxide at the outlet of the air preheater, the specific heat capacity of oxygen at the outlet of the air preheater, and the specific heat capacity of nitrogen at the outlet of the air preheater.

[0307] For example, the nitrogen concentration r at the air preheater outlet is obtained based on the water vapor concentration, carbon dioxide concentration, and oxygen concentration detected at the air preheater outlet. N2,out,AH This can be achieved through, but is not limited to, the following formula:

[0308] r N2,out,AH =1-r H2O,out,AH -r O2,out,AH -r CO2,out,AH

[0309] The variables are defined as follows: water vapor concentration r at the air preheater outlet. H2O,out,AHThe carbon dioxide concentration r measured at the outlet of the air preheater CO2,out,AH The oxygen concentration r measured at the outlet of the air preheater O2,out,AH .

[0310] For example, the step of obtaining the nitrogen concentration at the air preheater outlet based on the water vapor concentration, carbon dioxide concentration, and oxygen concentration detected at the air preheater outlet, and then obtaining the specific heat capacities of water vapor, carbon dioxide, oxygen, and nitrogen at the air preheater outlet respectively, can be achieved through calculations based on thermophysical property principles, which is an existing technology.

[0311] For example, the specific heat capacity c of the gas at the air preheater outlet is obtained based on the specific heat capacity of water vapor at the air preheater outlet, the specific heat capacity of carbon dioxide at the air preheater outlet, the specific heat capacity of oxygen at the air preheater outlet, and the specific heat capacity of nitrogen at the air preheater outlet. gas,AH This can be achieved, but is not limited to, by using the average of the specific heat capacity of water vapor at the air preheater outlet, the specific heat capacity of carbon dioxide at the air preheater outlet, the specific heat capacity of oxygen at the air preheater outlet, and the specific heat capacity of nitrogen at the air preheater outlet as the specific heat capacity of the gas at the air preheater outlet.

[0312] It should be noted that the specific heat capacity c of the gas at the air preheater outlet is... gas,AH The specific implementation method can be determined by those skilled in the art based on the actual situation. The above description is only an example and does not constitute a limitation.

[0313] The above steps determine the specific heat capacity of the gas at the air preheater outlet, taking into account the fact that the temperature of the gas at the air preheater outlet differs from that at room temperature. Therefore, the accuracy of the determined specific heat capacity of the gas at the air preheater outlet can be improved, and the necessary and accurate input parameters are provided for the step of determining the flue gas loss of the oxygen-enriched combustion boiler.

[0314] In an optional implementation, the step of obtaining the gas specific heat capacity at the flue gas recirculation extraction point based on the water vapor concentration, carbon dioxide concentration, and oxygen concentration detected at the flue gas recirculation extraction point includes:

[0315] The nitrogen concentration at the flue gas recirculation extraction point is obtained based on the water vapor concentration, carbon dioxide concentration, and oxygen concentration detected at the flue gas recirculation extraction point.

[0316] Based on the water vapor concentration, carbon dioxide concentration, oxygen concentration, and nitrogen concentration detected at the flue gas recirculation extraction point, the specific heat capacity of water vapor, carbon dioxide, oxygen, and nitrogen at the flue gas recirculation extraction point are obtained respectively.

[0317] The specific heat capacity of the gas at the flue gas recirculation extraction point is obtained based on the specific heat capacity of water vapor, carbon dioxide, oxygen, and nitrogen at the flue gas recirculation extraction point.

[0318] For example, the nitrogen concentration r at the flue gas recirculation extraction point is obtained based on the water vapor concentration, carbon dioxide concentration, and oxygen concentration detected at the flue gas recirculation extraction point. N2,imax This can be achieved through, but is not limited to, the following formula:

[0319] r N2,imax =1-r H2O,imax -r O2,imax -r CO2,imax

[0320] The variables are defined as follows: the water vapor concentration r detected at the flue gas recirculation extraction point. H2O,imax The oxygen concentration r measured at the flue gas recirculation extraction point O2,imax The carbon dioxide concentration r measured at the flue gas recirculation extraction point CO2,imax .

[0321] For example, the specific heat capacity of water vapor, carbon dioxide, oxygen, and nitrogen at the flue gas recirculation extraction point is obtained from the water vapor concentration, carbon dioxide concentration, oxygen concentration, and nitrogen concentration detected at the flue gas recirculation extraction point, respectively. This can be calculated using the principle of thermophysical properties, which is an existing technology.

[0322] For example, the gas specific heat capacity c at the flue gas recirculation extraction point is obtained based on the specific heat capacity of water vapor, carbon dioxide, oxygen, and nitrogen at the flue gas recirculation extraction point. gas,imaxThis can be achieved, but is not limited to, by using the average value of the water vapor specific heat capacity, carbon dioxide specific heat capacity, oxygen specific heat capacity, and nitrogen specific heat capacity at the flue gas recirculation extraction point as the gas specific heat capacity at the air preheater outlet.

[0323] It should be noted that the specific heat capacity c of the gas at the flue gas recirculation extraction point is... gas,imax The specific implementation method can be determined by those skilled in the art based on the actual situation. The above description is only an example and does not constitute a limitation.

[0324] The above steps determine the specific heat capacity of the gas at the flue gas recirculation extraction point, taking into account the fact that the temperature of the gas at the flue gas recirculation extraction point is different from that at room temperature. Therefore, the accuracy of the determined specific heat capacity of the gas at the flue gas recirculation extraction point can be improved, and the necessary and accurate input parameters can be provided for the step of determining the exhaust gas loss of the oxygen-enriched combustion boiler.

[0325] Based on the same principle, this invention discloses a device 600 for determining the flue gas loss of an oxygen-enriched combustion boiler, such as... Figure 6 As shown, the flue gas loss determination device 600 for oxygen-enriched combustion boiler includes:

[0326] The flue gas emission determination module 601 is used to determine the flue gas emission per unit mass of received base coal based on the received base coal parameters and the carbon dioxide concentration detected at the flue gas recirculation extraction point.

[0327] The condensate vapor quantity determination module 602 is used to determine the total boiler air leakage and oxygen injection quantity corresponding to a unit mass of received base coal based on the received base coal parameters, the carbon dioxide concentration detected at the flue gas recirculation extraction point, the oxygen concentration detected at the flue gas recirculation extraction point, the water vapor concentration detected at the flue gas recirculation extraction point, atmospheric parameters, and oxygen injection purity. Then, based on the total boiler air leakage and flue gas volume corresponding to a unit mass of received base coal, the water vapor concentration detected at the flue gas recirculation extraction point, the received base coal parameters, and the atmospheric parameters, the condensate vapor quantity corresponding to a unit mass of received base coal is determined.

[0328] The air preheater outlet water vapor concentration determination module 603 is used to determine the recirculated flue gas volume corresponding to the unit mass of received base coal based on the oxygen injection volume corresponding to the unit mass of received base coal, the primary air oxygen injection parameters, the secondary air oxygen injection parameters, the dry air oxygen injection parameters, the oxygen injection purity, and the oxygen concentration detected at the flue gas recirculation extraction point. Based on the recirculated flue gas volume, the water vapor concentration detected at the flue gas recirculation extraction point, the exhaust volume, the condensate water vapor volume, the atmospheric parameters, the received base coal parameters, the total boiler air leakage, and the carbon dioxide concentration detected at the air preheater outlet and the flue gas recirculation extraction point, the water vapor concentration at the air preheater outlet is determined.

[0329] The flue gas loss determination module 604 is used to determine the flue gas loss of the oxygen-enriched combustion boiler based on the atmospheric parameters, the carbon dioxide concentration detected at the flue gas recirculation extraction point, the oxygen concentration detected at the flue gas recirculation extraction point, the water vapor concentration detected at the flue gas recirculation extraction point, the water vapor concentration at the air preheater outlet, the carbon dioxide concentration detected at the air preheater outlet, the oxygen concentration detected at the air preheater outlet, the condensate steam volume, the flue gas volume, the recirculated flue gas volume, the oxygen injection volume, the specific heat capacity parameter, the total air leakage volume, the combustion parameters, and the detected temperature parameters.

[0330] In an optional implementation, the smoke exhaust volume determination module 601 is used for:

[0331] Based on the received base coal parameters, the carbon element quality index of the received base coal is obtained;

[0332] The amount of flue gas emitted per unit mass of received base coal is obtained based on the carbon element quality index of the received base coal and the carbon dioxide concentration detected at the flue gas recirculation extraction point.

[0333] In an optional implementation, the condensate vapor quantity determination module 602 is used for:

[0334] Based on the received base coal parameters, the carbon, hydrogen, oxygen, nitrogen, sulfur and moisture quality indicators of the received base coal are obtained.

[0335] Based on the atmospheric parameters, the absolute humidity of the atmosphere is obtained;

[0336] Based on the carbon, hydrogen, oxygen, nitrogen, sulfur, and moisture content of the received base coal, the absolute atmospheric humidity, oxygen purity, carbon dioxide concentration detected at the flue gas recirculation extraction point, oxygen concentration detected at the flue gas recirculation extraction point, and water vapor concentration detected at the flue gas recirculation extraction point, the total boiler air leakage per unit mass of received base coal is obtained.

[0337] Based on the oxygen purity, carbon element quality index, hydrogen element quality index, oxygen element quality index, sulfur element quality index, carbon dioxide concentration detected at the flue gas recirculation extraction point, oxygen concentration detected at the flue gas recirculation extraction point, absolute atmospheric humidity, and total boiler air leakage, the oxygen injection amount corresponding to the unit mass of received base coal is obtained.

[0338] In an optional implementation, the condensate vapor quantity determination module 602 is used for:

[0339] Based on the received base coal parameters, the hydrogen element quality index and moisture quality index of the received base coal are obtained;

[0340] Based on the atmospheric parameters, the absolute humidity of the atmosphere is obtained;

[0341] Based on the hydrogen quality index, moisture quality index, absolute atmospheric humidity, total boiler air leakage, flue gas volume, and water vapor concentration detected at the flue gas recirculation extraction point, the amount of condensed water vapor corresponding to a unit mass of received base coal is obtained.

[0342] In an optional implementation, the air preheater outlet water vapor concentration determination module 603 is used for:

[0343] Based on the primary air oxygen injection parameters, the oxygen concentration and primary air oxygen supply flow rate after primary air oxygen injection are obtained;

[0344] Based on the secondary air oxygen injection parameters, the oxygen concentration and secondary air oxygen supply flow rate after secondary air oxygen injection are obtained.

[0345] Based on the oxygen injection parameters of the dry air, the oxygen concentration and oxygen supply flow rate of the dry air after oxygen injection are obtained;

[0346] The amount of recirculated flue gas corresponding to a unit mass of received base coal is obtained based on the oxygen concentration after primary air oxygen injection, the primary air oxygen supply flow rate, the secondary air oxygen injection concentration after secondary air oxygen injection, the secondary air oxygen supply flow rate, the oxygen concentration after drying air oxygen injection, the drying air oxygen supply flow rate, the amount of oxygen injected per unit mass of received base coal, the oxygen purity, and the oxygen concentration detected at the flue gas recirculation extraction point.

[0347] In an optional implementation, the air preheater outlet water vapor concentration determination module 603 is used for:

[0348] Based on the atmospheric parameters, the absolute humidity of the atmosphere is obtained;

[0349] Based on the received base coal parameters, the hydrogen element quality index and moisture quality index of the received base coal are obtained;

[0350] The water vapor concentration at the air preheater outlet is obtained based on the hydrogen quality index, moisture quality index, absolute atmospheric humidity, recirculated flue gas volume, water vapor concentration detected at the flue gas recirculation extraction point, exhaust volume, condensate steam volume, total boiler air leakage, air preheater outlet, and carbon dioxide concentration detected at the flue gas recirculation extraction point.

[0351] In an optional implementation, the smoke exhaust loss determination module 604 is used for:

[0352] Based on the atmospheric parameters, the absolute humidity of the atmosphere is obtained;

[0353] Based on the combustion parameters, the solid incomplete combustion loss and the lower heating value of coal are obtained;

[0354] Based on the specific heat capacity parameters, the specific heat capacity of oxygen, air, and water are obtained.

[0355] Based on the temperature parameters, the gas temperature at the air preheater outlet, the gas temperature at the flue gas recirculation extraction point, the oxygen injection temperature, and the atmospheric temperature are obtained.

[0356] The exhaust losses of the oxygen-enriched combustion boiler are calculated based on the absolute atmospheric humidity, incomplete combustion loss of solids, lower heating value of coal, specific heat capacity of oxygen, specific heat capacity of air, specific heat capacity of water, gas temperature at the air preheater outlet, gas temperature at the flue gas recirculation extraction point, temperature of injected oxygen, atmospheric temperature, carbon dioxide concentration detected at the flue gas recirculation extraction point, oxygen concentration detected at the flue gas recirculation extraction point, water vapor concentration detected at the flue gas recirculation extraction point, water vapor concentration at the air preheater outlet, carbon dioxide concentration detected at the air preheater outlet, oxygen concentration detected at the air preheater outlet, condensate steam volume, exhaust volume, recirculated flue gas volume, oxygen injection volume, and total air leakage.

[0357] In an optional implementation, the condensate vapor quantity determination module 602 is used for:

[0358] Based on the aforementioned carbon, hydrogen, nitrogen, sulfur, and moisture quality indicators, the amount of flue gas required for the complete combustion of a unit mass of received base coal is obtained.

[0359] Based on the aforementioned carbon, hydrogen, sulfur, and oxygen quality indicators, the theoretical amount of oxygen required for the complete combustion of a unit mass of received base coal is obtained.

[0360] Based on the amount of flue gas required for complete combustion of a unit mass of received base coal, the theoretical amount of oxygen required for complete combustion of a unit mass of received base coal, the carbon element quality index, the hydrogen element quality index, the moisture quality index, the oxygen injection purity, the oxygen concentration detected at the flue gas recirculation extraction point, the carbon dioxide concentration detected at the flue gas recirculation extraction point, the water vapor concentration detected at the flue gas recirculation extraction point, and the absolute humidity of the atmosphere, the total boiler air leakage corresponding to a unit mass of received base coal is obtained.

[0361] In an optional implementation, the condensate vapor quantity determination module 602 is used for:

[0362] Based on the amount of flue gas from the complete combustion of a unit mass of received base coal, the theoretical amount of oxygen required for the complete combustion of a unit mass of received base coal, the carbon element quality index, the hydrogen element quality index, the moisture quality index, the oxygen injection purity, the oxygen concentration detected at the flue gas recirculation extraction point, the carbon dioxide concentration detected at the flue gas recirculation extraction point, and the water vapor concentration detected at the flue gas recirculation extraction point, the amount of nitrogen in the total boiler air leakage corresponding to a unit mass of received base coal is obtained.

[0363] Based on the oxygen purity and absolute atmospheric humidity, the proportion of nitrogen in the total boiler air leakage corresponding to a unit mass of received base coal is obtained.

[0364] Based on the nitrogen quantity and the nitrogen quantity ratio, the total boiler air leakage corresponding to a unit mass of received base coal is obtained.

[0365] In an optional implementation, the condensate vapor quantity determination module 602 is used for:

[0366] Based on the carbon element quality index, the oxygen concentration detected at the flue gas recirculation extraction point, and the carbon dioxide concentration detected at the flue gas recirculation extraction point, the oxygen content of the chimney exhaust corresponding to a unit mass of received base coal is obtained.

[0367] Based on the absolute atmospheric humidity and the total air leakage of the boiler, the amount of additional oxygen brought in by the air leakage per unit mass of received base coal is obtained.

[0368] Based on the aforementioned carbon, hydrogen, sulfur, and oxygen quality indicators, the theoretical amount of oxygen required for the complete combustion of a unit mass of received base coal is obtained.

[0369] Based on the oxygen content in the chimney exhaust, the additional oxygen due to air leakage, the theoretical oxygen required for complete combustion, and the purity of the injected oxygen, the amount of oxygen injected per unit mass of received base coal is obtained.

[0370] In an optional implementation, the condensate vapor quantity determination module 602 is used for:

[0371] Based on the hydrogen element quality index and moisture quality index, the amount of water vapor generated per unit mass of received base coal combustion is obtained;

[0372] Based on the absolute atmospheric humidity and the total air leakage of the boiler, the amount of water vapor in the air leakage corresponding to a unit mass of received base coal is obtained.

[0373] Based on the flue gas volume and the water vapor concentration detected at the flue gas recirculation extraction point, the amount of water vapor in the flue gas of the boiler corresponding to a unit mass of received base coal is obtained.

[0374] The amount of condensed water vapor per unit mass of received base coal is obtained based on the amount of water vapor generated by the combustion of base coal per unit mass, the amount of water vapor in the leaked air corresponding to the base coal per unit mass, and the amount of water vapor in the flue gas of the boiler exhaust corresponding to the base coal per unit mass.

[0375] In an optional implementation, the air preheater outlet water vapor concentration determination module 603 is used for:

[0376] Based on the oxygen injection amount corresponding to the unit mass of received base coal, the oxygen concentration after primary air oxygen injection, the oxygen injection purity, the oxygen concentration detected at the flue gas recirculation extraction point, the primary air oxygen supply flow rate, the secondary air oxygen supply flow rate, and the drying air oxygen supply flow rate, the amount of recirculated flue gas before primary air oxygen injection in the recirculated flue gas corresponding to the unit mass of received base coal is obtained.

[0377] Based on the oxygen injection amount corresponding to the unit mass of base coal received, the oxygen concentration after secondary air oxygen injection, the oxygen injection purity, the oxygen concentration detected at the flue gas recirculation extraction point, the primary air oxygen supply flow rate, the secondary air oxygen supply flow rate, and the drying air oxygen supply flow rate, the amount of recirculated flue gas before secondary air oxygen injection in the recirculated flue gas corresponding to the unit mass of base coal received is obtained.

[0378] Based on the oxygen injection amount corresponding to the unit mass of base coal received, the oxygen concentration after oxygen injection of dry air, the oxygen injection purity, the oxygen concentration detected at the flue gas recirculation extraction point, the primary air oxygen supply flow rate, the secondary air oxygen supply flow rate, and the dry air oxygen supply flow rate, the amount of recirculated flue gas before oxygen injection of dry air in the recirculated flue gas corresponding to the unit mass of base coal received is obtained.

[0379] The amount of recirculated flue gas corresponding to a unit mass of received base coal is obtained based on the amount of recirculated flue gas before primary air oxygen injection, the amount of recirculated flue gas before secondary air oxygen injection, and the amount of recirculated flue gas before drying air oxygen injection in the recirculated flue gas corresponding to the unit mass of received base coal.

[0380] In an optional implementation, the air preheater outlet water vapor concentration determination module 603 is used for:

[0381] Based on the recirculated flue gas volume and the water vapor concentration detected at the flue gas recirculation extraction point, the water vapor content in the recirculated flue gas corresponding to a unit mass of received base coal is obtained.

[0382] Based on the hydrogen element quality index and moisture quality index, the amount of water vapor obtained per unit mass of received base coal combustion is obtained.

[0383] Based on the condensate steam volume, flue gas volume, recirculated flue gas volume, carbon dioxide concentration detected at the flue gas recirculation extraction point, carbon dioxide concentration detected at the air preheater outlet, atmospheric absolute humidity, and total boiler air leakage, the amount of water vapor in the air leakage from the furnace to the air preheater corresponding to a unit mass of received base coal is obtained.

[0384] Based on the recirculated flue gas volume, condensate vapor volume, exhaust volume, carbon dioxide concentration detected at the flue gas recirculation extraction point, and carbon dioxide concentration detected at the air preheater outlet, the flue gas volume corresponding to the air preheater flue for a unit mass of received base coal is obtained.

[0385] The water vapor concentration at the air preheater outlet is obtained based on the amount of water vapor in the recirculated flue gas corresponding to the unit mass of received base coal, the amount of water vapor obtained from the combustion of the unit mass of received base coal, the amount of water vapor in the air leakage from the furnace to the air preheater corresponding to the unit mass of received base coal, and the amount of flue gas in the air preheater flue corresponding to the unit mass of received base coal.

[0386] In an optional implementation, the air preheater outlet water vapor concentration determination module 603 is used for:

[0387] Based on the amount of condensed water vapor, the amount of flue gas, the amount of recirculated flue gas, the carbon dioxide concentration detected at the flue gas recirculation extraction point, and the carbon dioxide concentration detected at the air preheater outlet, the air leakage between the air preheater and the flue gas recirculation extraction point corresponding to a unit mass of received base coal is obtained.

[0388] Based on the total air leakage of the boiler and the air leakage between the air preheater and the flue gas recirculation extraction point corresponding to the unit mass of received base coal, the air leakage from the furnace to the air preheater corresponding to the unit mass of received base coal is obtained.

[0389] The amount of water vapor in the air leakage from the furnace to the air preheater corresponding to the unit mass of received base coal is obtained based on the air leakage from the furnace to the air preheater corresponding to the unit mass of received base coal and the absolute humidity of the atmosphere.

[0390] In an optional implementation, the air preheater outlet water vapor concentration determination module 603 is used for:

[0391] Based on the amount of condensed water vapor, the amount of flue gas, the amount of recirculated flue gas, the carbon dioxide concentration detected at the flue gas recirculation extraction point, and the carbon dioxide concentration detected at the air preheater outlet, the air leakage between the air preheater and the flue gas recirculation extraction point corresponding to a unit mass of received base coal is obtained.

[0392] The flue gas volume of the air preheater flue corresponding to the unit mass of received base coal is obtained based on the recirculated flue gas volume, condensate vapor volume, exhaust volume, and the air leakage between the air preheater and the flue gas recirculation extraction point corresponding to the unit mass of received base coal.

[0393] In an optional implementation, the smoke exhaust loss determination module 604 is used for:

[0394] Based on the amount of condensed water vapor, the amount of flue gas, the amount of recirculated flue gas, the carbon dioxide concentration detected at the flue gas recirculation extraction point, and the carbon dioxide concentration detected at the air preheater outlet, the air leakage between the air preheater and the flue gas recirculation extraction point corresponding to a unit mass of received base coal is obtained.

[0395] Based on the total air leakage and the air leakage between the air preheater and the flue gas recirculation extraction point corresponding to the unit mass of received base coal, the air leakage from the furnace to the air preheater corresponding to the unit mass of received base coal is obtained.

[0396] The specific heat capacity of the gas at the outlet of the air preheater is obtained based on the water vapor concentration at the outlet of the air preheater, the carbon dioxide concentration detected at the outlet of the air preheater, and the oxygen concentration detected at the outlet of the air preheater.

[0397] The specific heat capacity of the gas at the flue gas recirculation extraction point is obtained based on the water vapor concentration, carbon dioxide concentration, and oxygen concentration detected at the flue gas recirculation extraction point.

[0398] Based on the condensate steam volume, flue gas volume, recirculated flue gas volume, air leakage between the air preheater and the flue gas recirculation extraction point, the specific heat capacity of the gas at the air preheater outlet, and the gas temperature at the air preheater outlet, the enthalpy of the boiler main flue gas corresponding to a unit mass of received base coal is obtained.

[0399] Based on the recirculated flue gas volume, the specific heat capacity of the gas at the flue gas recirculation extraction point, and the gas temperature at the flue gas recirculation extraction point, the enthalpy of the recirculated flue gas corresponding to a unit mass of received base coal is obtained.

[0400] Based on the oxygen injection volume, the specific heat capacity of oxygen, and the temperature of the injected oxygen, the enthalpy of the injected oxygen corresponding to a unit mass of received base coal is obtained.

[0401] Based on the specific heat capacity of the air, the temperature of the atmosphere, the absolute humidity of the atmosphere, and the air leakage from the furnace to the air preheater, the enthalpy of the dry air in the air leakage from the furnace to the air preheater corresponding to a unit mass of received base coal is obtained.

[0402] Based on the specific heat capacity of water, atmospheric temperature, atmospheric absolute humidity, and air leakage from the furnace to the air preheater, the enthalpy of water vapor in the air leakage from the furnace to the air preheater corresponding to a unit mass of received base coal is obtained.

[0403] The exhaust gas loss of an oxygen-enriched combustion boiler is obtained based on the enthalpy of the main flue gas in the boiler corresponding to a unit mass of received base coal, the enthalpy of the circulating flue gas corresponding to a unit mass of received base coal, the enthalpy of the injected oxygen corresponding to a unit mass of received base coal, the enthalpy of the dry air in the leaked air from the furnace to the air preheater corresponding to a unit mass of received base coal, the enthalpy of the water vapor in the leaked air from the furnace to the air preheater corresponding to a unit mass of received base coal, the incomplete combustion loss of solids, and the lower heating value of coal.

[0404] In an optional implementation, the smoke exhaust loss determination module 604 is used for:

[0405] The nitrogen concentration at the air preheater outlet is obtained based on the water vapor concentration, carbon dioxide concentration, and oxygen concentration detected at the air preheater outlet.

[0406] Based on the water vapor concentration, carbon dioxide concentration, and oxygen concentration detected at the air preheater outlet, the nitrogen concentration at the air preheater outlet is obtained, and the specific heat capacity of water vapor, carbon dioxide, oxygen, and nitrogen at the air preheater outlet are obtained respectively.

[0407] The specific heat capacity of the gas at the outlet of the air preheater is obtained based on the specific heat capacity of water vapor at the outlet of the air preheater, the specific heat capacity of carbon dioxide at the outlet of the air preheater, the specific heat capacity of oxygen at the outlet of the air preheater, and the specific heat capacity of nitrogen at the outlet of the air preheater.

[0408] In an optional implementation, the smoke exhaust loss determination module 604 is used for:

[0409] The nitrogen concentration at the flue gas recirculation extraction point is obtained based on the water vapor concentration, carbon dioxide concentration, and oxygen concentration detected at the flue gas recirculation extraction point.

[0410] Based on the water vapor concentration, carbon dioxide concentration, oxygen concentration, and nitrogen concentration detected at the flue gas recirculation extraction point, the specific heat capacity of water vapor, carbon dioxide, oxygen, and nitrogen at the flue gas recirculation extraction point are obtained respectively.

[0411] The specific heat capacity of the gas at the flue gas recirculation extraction point is obtained based on the specific heat capacity of water vapor, carbon dioxide, oxygen, and nitrogen at the flue gas recirculation extraction point.

[0412] Since the principle of the oxygen-enriched combustion boiler flue gas loss determination device 600 is similar to the above method, the implementation of this oxygen-enriched combustion boiler flue gas loss determination device 600 can refer to the implementation of the above method, and will not be repeated here.

[0413] The systems, devices, modules, or units described in the above embodiments can be implemented by computer chips or entities, or by products with certain functions. A typical implementation device is a computer device, specifically, a computer device can be, for example, a personal computer, a laptop computer, a cellular phone, a camera phone, a smartphone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or any combination of these devices.

[0414] In a typical example, a computer device specifically includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the program, implements the method described above.

[0415] The following is for reference. Figure 7 It shows a schematic diagram of the structure of a computer device 700 suitable for implementing the embodiments of this application.

[0416] like Figure 7 As shown, the computer device 700 includes a central processing unit (CPU) 701, which can perform various appropriate tasks and processes based on programs stored in read-only memory (ROM) 702 or programs loaded from storage section 708 into random access memory (RAM) 703. The RAM 703 also stores various programs and data required for the operation of the system 700. The CPU 701, ROM 702, and RAM 703 are interconnected via a bus 704. An input / output (I / O) interface 705 is also connected to the bus 704.

[0417] The following components are connected to the I / O interface 705: an input section 706 including a keyboard, mouse, etc.; an output section 707 including a cathode ray tube (CRT), liquid crystal feedback (LCD), etc., and speakers, etc.; a storage section 708 including a hard disk, etc.; and a communication section 709 including a network interface card such as a LAN card, modem, etc. The communication section 709 performs communication processing via a network such as the Internet. A drive 710 is also connected to the I / O interface 705 as needed. A removable medium 711, such as a disk, optical disk, magneto-optical disk, semiconductor memory, etc., is installed on the drive 710 as needed so that computer programs read from it can be installed in the storage section 708 as needed.

[0418] In particular, according to embodiments of the present invention, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments of the present invention include a computer program product comprising a computer program tangibly embodied on a machine-readable medium, the computer program including program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via communication section 709, and / or installed from removable medium 711.

[0419] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0420] For ease of description, the above devices are described separately by function as various units. Of course, in implementing this application, the functions of each unit can be implemented in one or more software and / or hardware.

[0421] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0422] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0423] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0424] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0425] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0426] This application can be described in the general context of computer-executable instructions, such as program modules, that are executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc., that perform a specific task or implement a specific abstract data type. This application can also be practiced in distributed computing environments where tasks are performed by remote processing devices connected via a communication network. In distributed computing environments, program modules can reside in local and remote computer storage media, including storage devices.

[0427] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0428] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A method for determining flue gas losses in an oxygen-enriched combustion boiler, characterized in that, include: The amount of flue gas emitted per unit mass of received base coal is obtained based on the parameters of the received base coal and the carbon dioxide concentration detected at the flue gas recirculation extraction point. Based on the received base coal parameters, the carbon dioxide concentration detected at the flue gas recirculation extraction point, the oxygen concentration detected at the flue gas recirculation extraction point, the water vapor concentration detected at the flue gas recirculation extraction point, atmospheric parameters, and oxygen injection purity, the total boiler air leakage and oxygen injection volume corresponding to a unit mass of received base coal are obtained. Then, based on the total boiler air leakage and flue gas volume corresponding to a unit mass of received base coal, the water vapor concentration detected at the flue gas recirculation extraction point, the received base coal parameters, and the atmospheric parameters, the condensate vapor volume corresponding to a unit mass of received base coal is obtained. Based on the oxygen injection amount per unit mass of received base coal, primary air oxygen injection parameters, secondary air oxygen injection parameters, drying air oxygen injection parameters, oxygen purity, and oxygen concentration detected at the flue gas recirculation extraction point, the recirculated flue gas volume per unit mass of received base coal is obtained. Based on the recirculated flue gas volume, water vapor concentration detected at the flue gas recirculation extraction point, exhaust volume, condensate volume, atmospheric parameters, received base coal parameters, total boiler air leakage, and carbon dioxide concentration detected at the air preheater outlet and flue gas recirculation extraction point, the water vapor concentration at the air preheater outlet is obtained. The exhaust gas loss of the oxygen-enriched combustion boiler is calculated based on the atmospheric parameters, the carbon dioxide concentration detected at the flue gas recirculation extraction point, the oxygen concentration detected at the flue gas recirculation extraction point, the water vapor concentration detected at the flue gas recirculation extraction point, the water vapor concentration at the air preheater outlet, the carbon dioxide concentration detected at the air preheater outlet, the oxygen concentration detected at the air preheater outlet, the condensate steam volume, the exhaust gas volume, the recirculated flue gas volume, the oxygen injection volume, the specific heat capacity parameter, the total air leakage volume, the combustion parameters, and the detected temperature parameters.

2. The method according to claim 1, characterized in that, The method of obtaining the flue gas emission per unit mass of received base coal based on the received base coal parameters and the carbon dioxide concentration detected at the flue gas recirculation extraction point includes: Based on the received base coal parameters, the carbon element quality index of the received base coal is obtained; The amount of flue gas emitted per unit mass of received base coal is obtained based on the carbon element quality index of the received base coal and the carbon dioxide concentration detected at the flue gas recirculation extraction point.

3. The method according to claim 1, characterized in that, The process of calculating the total boiler air leakage and oxygen injection volume per unit mass of received base coal based on the received base coal parameters, the carbon dioxide concentration detected at the flue gas recirculation extraction point, the oxygen concentration detected at the flue gas recirculation extraction point, the water vapor concentration detected at the flue gas recirculation extraction point, atmospheric parameters, and oxygen injection purity includes: Based on the received base coal parameters, the carbon, hydrogen, oxygen, nitrogen, sulfur and moisture quality indicators of the received base coal are obtained. Based on the atmospheric parameters, the absolute humidity of the atmosphere is obtained; Based on the carbon, hydrogen, oxygen, nitrogen, sulfur, and moisture content of the received base coal, the absolute atmospheric humidity, oxygen purity, carbon dioxide concentration detected at the flue gas recirculation extraction point, oxygen concentration detected at the flue gas recirculation extraction point, and water vapor concentration detected at the flue gas recirculation extraction point, the total boiler air leakage per unit mass of received base coal is obtained. Based on the oxygen purity, carbon element quality index, hydrogen element quality index, oxygen element quality index, sulfur element quality index, carbon dioxide concentration detected at the flue gas recirculation extraction point, oxygen concentration detected at the flue gas recirculation extraction point, absolute atmospheric humidity, and total boiler air leakage, the oxygen injection amount corresponding to the unit mass of received base coal is obtained.

4. The method according to claim 1, characterized in that, The method of obtaining the condensate vapor volume per unit mass of received base coal based on the total boiler air leakage and flue gas volume corresponding to the unit mass of received base coal, the water vapor concentration detected at the flue gas recirculation extraction point, the received base coal parameters, and the atmospheric parameters includes: Based on the received base coal parameters, the hydrogen element quality index and moisture quality index of the received base coal are obtained; Based on the atmospheric parameters, the absolute humidity of the atmosphere is obtained; Based on the hydrogen quality index, moisture quality index, absolute atmospheric humidity, total boiler air leakage, flue gas volume, and water vapor concentration detected at the flue gas recirculation extraction point, the amount of condensed water vapor corresponding to a unit mass of received base coal is obtained.

5. The method according to claim 1, characterized in that, The process of obtaining the recirculated flue gas volume per unit mass of received base coal based on the oxygen injection volume corresponding to the unit mass of received base coal, primary air oxygen injection parameters, secondary air oxygen injection parameters, drying air oxygen injection parameters, oxygen purity, and the oxygen concentration detected at the flue gas recirculation extraction point includes: Based on the primary air oxygen injection parameters, the oxygen concentration and primary air oxygen supply flow rate after primary air oxygen injection are obtained; Based on the secondary air oxygen injection parameters, the oxygen concentration and secondary air oxygen supply flow rate after secondary air oxygen injection are obtained. Based on the oxygen injection parameters of the dry air, the oxygen concentration and oxygen supply flow rate of the dry air after oxygen injection are obtained; The amount of recirculated flue gas corresponding to a unit mass of received base coal is obtained based on the oxygen concentration after primary air oxygen injection, the primary air oxygen supply flow rate, the secondary air oxygen injection concentration after secondary air oxygen injection, the secondary air oxygen supply flow rate, the oxygen concentration after drying air oxygen injection, the drying air oxygen supply flow rate, the amount of oxygen injected per unit mass of received base coal, the oxygen purity, and the oxygen concentration detected at the flue gas recirculation extraction point.

6. The method according to claim 1, characterized in that, The step of determining the water vapor concentration at the air preheater outlet based on the recirculated flue gas volume, water vapor concentration detected at the flue gas recirculation extraction point, exhaust volume, condensate vapor volume, atmospheric parameters, received base coal parameters, total boiler air leakage, and carbon dioxide concentration detected at the air preheater outlet and flue gas recirculation extraction point includes: Based on the atmospheric parameters, the absolute humidity of the atmosphere is obtained; Based on the received base coal parameters, the hydrogen element quality index and moisture quality index of the received base coal are obtained; The water vapor concentration at the air preheater outlet is obtained based on the hydrogen quality index, moisture quality index, absolute atmospheric humidity, recirculated flue gas volume, water vapor concentration detected at the flue gas recirculation extraction point, exhaust volume, condensate steam volume, total boiler air leakage, air preheater outlet, and carbon dioxide concentration detected at the flue gas recirculation extraction point.

7. The method according to claim 1, characterized in that, The exhaust losses of the oxygen-enriched combustion boiler are calculated based on the atmospheric parameters, the carbon dioxide concentration detected at the flue gas recirculation extraction point, the oxygen concentration detected at the flue gas recirculation extraction point, the water vapor concentration detected at the flue gas recirculation extraction point, the water vapor concentration at the air preheater outlet, the carbon dioxide concentration detected at the air preheater outlet, the oxygen concentration detected at the air preheater outlet, the condensate steam volume, the exhaust volume, the recirculated flue gas volume, the oxygen injection volume, the specific heat capacity parameter, the total air leakage volume, the combustion parameters, and the detected temperature parameters. These parameters include: Based on the atmospheric parameters, the absolute humidity of the atmosphere is obtained; Based on the combustion parameters, the solid incomplete combustion loss and the lower heating value of coal are obtained; Based on the specific heat capacity parameters, the specific heat capacity of oxygen, air, and water are obtained. Based on the temperature parameters, the gas temperature at the air preheater outlet, the gas temperature at the flue gas recirculation extraction point, the oxygen injection temperature, and the atmospheric temperature are obtained. The exhaust losses of the oxygen-enriched combustion boiler are calculated based on the absolute atmospheric humidity, incomplete combustion loss of solids, lower heating value of coal, specific heat capacity of oxygen, specific heat capacity of air, specific heat capacity of water, gas temperature at the air preheater outlet, gas temperature at the flue gas recirculation extraction point, temperature of injected oxygen, atmospheric temperature, carbon dioxide concentration detected at the flue gas recirculation extraction point, oxygen concentration detected at the flue gas recirculation extraction point, water vapor concentration detected at the flue gas recirculation extraction point, water vapor concentration at the air preheater outlet, carbon dioxide concentration detected at the air preheater outlet, oxygen concentration detected at the air preheater outlet, condensate steam volume, exhaust volume, recirculated flue gas volume, oxygen injection volume, and total air leakage.

8. The method according to claim 3, characterized in that, The total boiler air leakage per unit mass of received base coal is calculated based on the carbon, hydrogen, oxygen, nitrogen, sulfur, and moisture content of the received base coal, as well as the absolute atmospheric humidity, oxygen purity, carbon dioxide concentration detected at the flue gas recirculation extraction point, oxygen concentration detected at the flue gas recirculation extraction point, and water vapor concentration detected at the flue gas recirculation extraction point. This includes: Based on the aforementioned carbon, hydrogen, nitrogen, sulfur, and moisture quality indicators, the amount of flue gas required for the complete combustion of a unit mass of received base coal is obtained. Based on the aforementioned carbon, hydrogen, sulfur, and oxygen quality indicators, the theoretical amount of oxygen required for the complete combustion of a unit mass of received base coal is obtained. Based on the amount of flue gas required for complete combustion of a unit mass of received base coal, the theoretical amount of oxygen required for complete combustion of a unit mass of received base coal, the carbon element quality index, the hydrogen element quality index, the moisture quality index, the oxygen injection purity, the oxygen concentration detected at the flue gas recirculation extraction point, the carbon dioxide concentration detected at the flue gas recirculation extraction point, the water vapor concentration detected at the flue gas recirculation extraction point, and the absolute humidity of the atmosphere, the total boiler air leakage corresponding to a unit mass of received base coal is obtained.

9. The method according to claim 8, characterized in that, The total boiler air leakage per unit mass of received base coal is calculated based on the amount of flue gas generated from the complete combustion of the received base coal, the theoretical amount of oxygen required for the complete combustion of the received base coal, the carbon element quality index, the hydrogen element quality index, the moisture quality index, the oxygen injection purity, the oxygen concentration detected at the flue gas recirculation extraction point, the carbon dioxide concentration detected at the flue gas recirculation extraction point, the water vapor concentration detected at the flue gas recirculation extraction point, and the absolute humidity of the atmosphere. This includes: Based on the amount of flue gas from the complete combustion of a unit mass of received base coal, the theoretical amount of oxygen required for the complete combustion of a unit mass of received base coal, the carbon element quality index, the hydrogen element quality index, the moisture quality index, the oxygen injection purity, the oxygen concentration detected at the flue gas recirculation extraction point, the carbon dioxide concentration detected at the flue gas recirculation extraction point, and the water vapor concentration detected at the flue gas recirculation extraction point, the amount of nitrogen in the total boiler air leakage corresponding to a unit mass of received base coal is obtained. Based on the oxygen purity and absolute atmospheric humidity, the proportion of nitrogen in the total boiler air leakage corresponding to a unit mass of received base coal is obtained. Based on the nitrogen quantity and the nitrogen quantity ratio, the total boiler air leakage corresponding to a unit mass of received base coal is obtained.

10. The method according to claim 3, characterized in that, The oxygen injection amount per unit mass of received base coal is obtained based on the oxygen injection purity, carbon element quality index, hydrogen element quality index, oxygen element quality index, sulfur element quality index, carbon dioxide concentration detected at the flue gas recirculation extraction point, oxygen concentration detected at the flue gas recirculation extraction point, absolute atmospheric humidity, and total boiler air leakage, including: Based on the carbon element quality index, the oxygen concentration detected at the flue gas recirculation extraction point, and the carbon dioxide concentration detected at the flue gas recirculation extraction point, the oxygen content of the chimney exhaust corresponding to a unit mass of received base coal is obtained. Based on the absolute atmospheric humidity and the total air leakage of the boiler, the amount of additional oxygen brought in by the air leakage per unit mass of received base coal is obtained. Based on the aforementioned carbon, hydrogen, sulfur, and oxygen quality indicators, the theoretical amount of oxygen required for the complete combustion of a unit mass of received base coal is obtained. Based on the oxygen content in the chimney exhaust, the additional oxygen due to air leakage, the theoretical oxygen required for complete combustion, and the purity of the injected oxygen, the amount of oxygen injected per unit mass of received base coal is obtained.

11. The method according to claim 4, characterized in that, The method for obtaining the amount of condensed water vapor per unit mass of received base coal based on the hydrogen quality index, moisture quality index, absolute atmospheric humidity, total boiler air leakage, flue gas volume, and water vapor concentration detected at the flue gas recirculation extraction point includes: Based on the hydrogen element quality index and moisture quality index, the amount of water vapor generated per unit mass of received base coal combustion is obtained; Based on the absolute atmospheric humidity and the total air leakage of the boiler, the amount of water vapor in the air leakage corresponding to a unit mass of received base coal is obtained. Based on the flue gas volume and the water vapor concentration detected at the flue gas recirculation extraction point, the amount of water vapor in the flue gas of the boiler corresponding to a unit mass of received base coal is obtained. The amount of condensed water vapor per unit mass of received base coal is obtained based on the amount of water vapor generated by the combustion of base coal per unit mass, the amount of water vapor in the leaked air corresponding to the base coal per unit mass, and the amount of water vapor in the flue gas of the boiler exhaust corresponding to the base coal per unit mass.

12. The method according to claim 5, characterized in that, The method of obtaining the recirculated flue gas volume corresponding to a unit mass of received base coal based on the oxygen concentration after primary air oxygen injection, primary air oxygen supply flow rate, secondary air oxygen injection concentration, secondary air oxygen supply flow rate, drying air oxygen injection concentration, drying air oxygen supply flow rate, oxygen injection volume corresponding to a unit mass of received base coal, oxygen injection purity, and the oxygen concentration detected at the flue gas recirculation extraction point includes: Based on the oxygen injection amount corresponding to the unit mass of received base coal, the oxygen concentration after primary air oxygen injection, the oxygen injection purity, the oxygen concentration detected at the flue gas recirculation extraction point, the primary air oxygen supply flow rate, the secondary air oxygen supply flow rate, and the drying air oxygen supply flow rate, the amount of recirculated flue gas before primary air oxygen injection in the recirculated flue gas corresponding to the unit mass of received base coal is obtained. Based on the oxygen injection amount corresponding to the unit mass of base coal received, the oxygen concentration after secondary air oxygen injection, the oxygen injection purity, the oxygen concentration detected at the flue gas recirculation extraction point, the primary air oxygen supply flow rate, the secondary air oxygen supply flow rate, and the drying air oxygen supply flow rate, the amount of recirculated flue gas before secondary air oxygen injection in the recirculated flue gas corresponding to the unit mass of base coal received is obtained. Based on the oxygen injection amount corresponding to the unit mass of base coal received, the oxygen concentration after oxygen injection of dry air, the oxygen injection purity, the oxygen concentration detected at the flue gas recirculation extraction point, the primary air oxygen supply flow rate, the secondary air oxygen supply flow rate, and the dry air oxygen supply flow rate, the amount of recirculated flue gas before oxygen injection of dry air in the recirculated flue gas corresponding to the unit mass of base coal received is obtained. The amount of recirculated flue gas corresponding to a unit mass of received base coal is obtained based on the amount of recirculated flue gas before primary air oxygen injection, the amount of recirculated flue gas before secondary air oxygen injection, and the amount of recirculated flue gas before drying air oxygen injection in the recirculated flue gas corresponding to the unit mass of received base coal.

13. The method according to claim 6, characterized in that, The method of obtaining the water vapor concentration at the air preheater outlet based on the hydrogen quality index, moisture quality index, absolute atmospheric humidity, recirculated flue gas volume, water vapor concentration detected at the flue gas recirculation extraction point, exhaust volume, condensate steam volume, total boiler air leakage, air preheater outlet, and carbon dioxide concentration detected at the flue gas recirculation extraction point includes: Based on the recirculated flue gas volume and the water vapor concentration detected at the flue gas recirculation extraction point, the water vapor content in the recirculated flue gas corresponding to a unit mass of received base coal is obtained. Based on the hydrogen element quality index and moisture quality index, the amount of water vapor obtained per unit mass of received base coal combustion is obtained. Based on the condensate steam volume, flue gas volume, recirculated flue gas volume, carbon dioxide concentration detected at the flue gas recirculation extraction point, carbon dioxide concentration detected at the air preheater outlet, atmospheric absolute humidity, and total boiler air leakage, the amount of water vapor in the air leakage from the furnace to the air preheater corresponding to a unit mass of received base coal is obtained. Based on the recirculated flue gas volume, condensate vapor volume, exhaust volume, carbon dioxide concentration detected at the flue gas recirculation extraction point, and carbon dioxide concentration detected at the air preheater outlet, the flue gas volume corresponding to the air preheater flue for a unit mass of received base coal is obtained. The water vapor concentration at the air preheater outlet is obtained based on the amount of water vapor in the recirculated flue gas corresponding to the unit mass of received base coal, the amount of water vapor obtained from the combustion of the unit mass of received base coal, the amount of water vapor in the air leakage from the furnace to the air preheater corresponding to the unit mass of received base coal, and the amount of flue gas in the air preheater flue corresponding to the unit mass of received base coal.

14. The method according to claim 13, characterized in that, The method of obtaining the amount of water vapor in the air leakage from the furnace to the air preheater corresponding to a unit mass of received base coal, based on the condensate steam volume, flue gas volume, recirculated flue gas volume, carbon dioxide concentration detected at the flue gas recirculation extraction point, carbon dioxide concentration detected at the air preheater outlet, atmospheric absolute humidity, and total boiler air leakage, includes: Based on the amount of condensed water vapor, the amount of flue gas, the amount of recirculated flue gas, the carbon dioxide concentration detected at the flue gas recirculation extraction point, and the carbon dioxide concentration detected at the air preheater outlet, the air leakage between the air preheater and the flue gas recirculation extraction point corresponding to a unit mass of received base coal is obtained. Based on the total air leakage of the boiler and the air leakage between the air preheater and the flue gas recirculation extraction point corresponding to the unit mass of received base coal, the air leakage from the furnace to the air preheater corresponding to the unit mass of received base coal is obtained. The amount of water vapor in the air leakage from the furnace to the air preheater corresponding to the unit mass of received base coal is obtained based on the air leakage from the furnace to the air preheater corresponding to the unit mass of received base coal and the absolute humidity of the atmosphere.

15. The method according to claim 13, characterized in that, The step of obtaining the flue gas volume in the air preheater duct corresponding to a unit mass of received base coal based on the recirculated flue gas volume, condensate vapor volume, exhaust volume, carbon dioxide concentration detected at the flue gas recirculation extraction point, and carbon dioxide concentration detected at the air preheater outlet includes: Based on the amount of condensed water vapor, the amount of flue gas, the amount of recirculated flue gas, the carbon dioxide concentration detected at the flue gas recirculation extraction point, and the carbon dioxide concentration detected at the air preheater outlet, the air leakage between the air preheater and the flue gas recirculation extraction point corresponding to a unit mass of received base coal is obtained. The flue gas volume of the air preheater flue corresponding to the unit mass of received base coal is obtained based on the recirculated flue gas volume, condensate vapor volume, exhaust volume, and the air leakage between the air preheater and the flue gas recirculation extraction point corresponding to the unit mass of received base coal.

16. The method according to claim 7, characterized in that, The exhaust losses of the oxygen-enriched combustion boiler are calculated based on the absolute atmospheric humidity, incomplete combustion loss of solids, lower heating value of coal, specific heat capacity of oxygen, specific heat capacity of air, specific heat capacity of water, gas temperature at the air preheater outlet, gas temperature at the flue gas recirculation extraction point, oxygen injection temperature, atmospheric temperature, carbon dioxide concentration detected at the flue gas recirculation extraction point, oxygen concentration detected at the flue gas recirculation extraction point, water vapor concentration detected at the flue gas recirculation extraction point, water vapor concentration at the air preheater outlet, carbon dioxide concentration detected at the air preheater outlet, oxygen concentration detected at the air preheater outlet, condensate steam volume, exhaust volume, recirculated flue gas volume, oxygen injection volume, and total air leakage. These losses include: Based on the amount of condensed water vapor, the amount of flue gas, the amount of recirculated flue gas, the carbon dioxide concentration detected at the flue gas recirculation extraction point, and the carbon dioxide concentration detected at the air preheater outlet, the air leakage between the air preheater and the flue gas recirculation extraction point corresponding to a unit mass of received base coal is obtained. Based on the total air leakage and the air leakage between the air preheater and the flue gas recirculation extraction point corresponding to the unit mass of received base coal, the air leakage from the furnace to the air preheater corresponding to the unit mass of received base coal is obtained. The specific heat capacity of the gas at the outlet of the air preheater is obtained based on the water vapor concentration at the outlet of the air preheater, the carbon dioxide concentration detected at the outlet of the air preheater, and the oxygen concentration detected at the outlet of the air preheater. The specific heat capacity of the gas at the flue gas recirculation extraction point is obtained based on the water vapor concentration, carbon dioxide concentration, and oxygen concentration detected at the flue gas recirculation extraction point. Based on the condensate steam volume, flue gas volume, recirculated flue gas volume, air leakage between the air preheater and the flue gas recirculation extraction point, the specific heat capacity of the gas at the air preheater outlet, and the gas temperature at the air preheater outlet, the enthalpy of the boiler main flue gas corresponding to a unit mass of received base coal is obtained. Based on the recirculated flue gas volume, the specific heat capacity of the gas at the flue gas recirculation extraction point, and the gas temperature at the flue gas recirculation extraction point, the enthalpy of the recirculated flue gas corresponding to a unit mass of received base coal is obtained. Based on the oxygen injection volume, the specific heat capacity of oxygen, and the temperature of the injected oxygen, the enthalpy of the injected oxygen corresponding to a unit mass of received base coal is obtained. Based on the specific heat capacity of the air, the temperature of the atmosphere, the absolute humidity of the atmosphere, and the air leakage from the furnace to the air preheater, the enthalpy of the dry air in the air leakage from the furnace to the air preheater corresponding to a unit mass of received base coal is obtained. Based on the specific heat capacity of water, atmospheric temperature, atmospheric absolute humidity, and air leakage from the furnace to the air preheater, the enthalpy of water vapor in the air leakage from the furnace to the air preheater corresponding to a unit mass of received base coal is obtained. The exhaust gas loss of an oxygen-enriched combustion boiler is obtained based on the enthalpy of the main flue gas in the boiler corresponding to a unit mass of received base coal, the enthalpy of the circulating flue gas corresponding to a unit mass of received base coal, the enthalpy of the injected oxygen corresponding to a unit mass of received base coal, the enthalpy of the dry air in the leaked air from the furnace to the air preheater corresponding to a unit mass of received base coal, the enthalpy of the water vapor in the leaked air from the furnace to the air preheater corresponding to a unit mass of received base coal, the incomplete combustion loss of solids, and the lower heating value of coal.

17. The method according to claim 16, characterized in that, The step of obtaining the specific heat capacity of the gas at the air preheater outlet based on the water vapor concentration, carbon dioxide concentration detected at the air preheater outlet, and oxygen concentration detected at the air preheater outlet includes: The nitrogen concentration at the air preheater outlet is obtained based on the water vapor concentration, carbon dioxide concentration, and oxygen concentration detected at the air preheater outlet. Based on the water vapor concentration, carbon dioxide concentration, and oxygen concentration detected at the air preheater outlet, the nitrogen concentration at the air preheater outlet is obtained, and the specific heat capacity of water vapor, carbon dioxide, oxygen, and nitrogen at the air preheater outlet are obtained respectively. The specific heat capacity of the gas at the outlet of the air preheater is obtained based on the specific heat capacity of water vapor at the outlet of the air preheater, the specific heat capacity of carbon dioxide at the outlet of the air preheater, the specific heat capacity of oxygen at the outlet of the air preheater, and the specific heat capacity of nitrogen at the outlet of the air preheater.

18. The method according to claim 16, characterized in that, The step of obtaining the gas specific heat capacity at the flue gas recirculation extraction point based on the water vapor concentration, carbon dioxide concentration, and oxygen concentration detected at the flue gas recirculation extraction point includes: The nitrogen concentration at the flue gas recirculation extraction point is obtained based on the water vapor concentration, carbon dioxide concentration, and oxygen concentration detected at the flue gas recirculation extraction point. Based on the water vapor concentration, carbon dioxide concentration, oxygen concentration, and nitrogen concentration detected at the flue gas recirculation extraction point, the specific heat capacity of water vapor, carbon dioxide, oxygen, and nitrogen at the flue gas recirculation extraction point are obtained respectively. The specific heat capacity of the gas at the flue gas recirculation extraction point is obtained based on the specific heat capacity of water vapor, carbon dioxide, oxygen, and nitrogen at the flue gas recirculation extraction point.

19. A device for determining flue gas loss in an oxygen-enriched combustion boiler, characterized in that, include: The flue gas emission determination module is used to determine the flue gas emission per unit mass of received base coal based on the parameters of the received base coal and the carbon dioxide concentration detected at the flue gas recirculation extraction point. The condensate vapor quantity determination module is used to determine the total boiler air leakage and oxygen injection quantity corresponding to a unit mass of received base coal based on the received base coal parameters, the carbon dioxide concentration detected at the flue gas recirculation extraction point, the oxygen concentration detected at the flue gas recirculation extraction point, the water vapor concentration detected at the flue gas recirculation extraction point, atmospheric parameters, and oxygen injection purity. Furthermore, it determines the condensate vapor quantity corresponding to a unit mass of received base coal based on the total boiler air leakage and flue gas emission volume corresponding to a unit mass of received base coal, the water vapor concentration detected at the flue gas recirculation extraction point, the received base coal parameters, and the atmospheric parameters. The air preheater outlet water vapor concentration determination module is used to obtain the recirculated flue gas volume corresponding to the unit mass of received base coal based on the oxygen injection volume corresponding to the unit mass of received base coal, the primary air oxygen injection parameters, the secondary air oxygen injection parameters, the dry air oxygen injection parameters, the oxygen injection purity, and the oxygen concentration detected at the flue gas recirculation extraction point. Based on the recirculated flue gas volume, the water vapor concentration detected at the flue gas recirculation extraction point, the exhaust volume, the condensate water vapor volume, the atmospheric parameters, the received base coal parameters, the total boiler air leakage, and the carbon dioxide concentration detected at the air preheater outlet and the flue gas recirculation extraction point, the water vapor concentration at the air preheater outlet is obtained. The flue gas loss determination module is used to determine the flue gas loss of the oxygen-enriched combustion boiler based on the atmospheric parameters, the carbon dioxide concentration detected at the flue gas recirculation extraction point, the oxygen concentration detected at the flue gas recirculation extraction point, the water vapor concentration detected at the flue gas recirculation extraction point, the water vapor concentration at the air preheater outlet, the carbon dioxide concentration detected at the air preheater outlet, the oxygen concentration detected at the air preheater outlet, the condensate steam volume, the flue gas volume, the recirculated flue gas volume, the oxygen injection volume, the specific heat capacity parameter, the total air leakage volume, the combustion parameters, and the detected temperature parameters.

20. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the method as described in any one of claims 1-18.

21. A computer-readable medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the method as described in any one of claims 1-18.

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