Method and device for determining air leakage of oxygen-enriched combustion boiler

Abstract

The present invention provides a method and device for determining the air leakage rate of an oxy-fuel combustion boiler, which relates to the technical field of boiler air leakage rate determination. The method comprises: obtaining the exhaust volume, condensed water vapor volume, total boiler air leakage rate, oxygen injection volume, and recirculated flue gas volume per unit mass of received base coal based on received base coal parameters, oxygen injection parameters, flue gas recirculation extraction point parameters, and atmospheric parameters; and then obtaining the target device air leakage rate based on the above variables, the target device extraction point parameters, and the extraction point parameters of the next adjacent device of the target device. The present invention makes it feasible to determine the target device air leakage rate in an oxy-fuel combustion boiler, and reduces the number of devices required to determine the target device air leakage rate, thereby effectively reducing the cost of determining the target device air leakage rate in the oxy-fuel combustion boiler.

Description

Technical Field

[0001] The present invention relates to the technical field of boiler air leakage determination, and in particular to a method and device for determining the air leakage of an oxygen-enriched combustion boiler. Background Art

[0002] As a carbon dioxide capture technology, boiler oxygen-enriched combustion technology is of great value in reducing carbon emissions in the power industry. It can provide high-concentration carbon dioxide for subsequent utilization, compression storage, etc., greatly reducing the energy consumption of carbon dioxide separation. However, this boiler thermal system is very sensitive to air leakage, and the control of air leakage is one of the main control targets of the oxygen-enriched combustion boiler. Therefore, it is necessary to determine the air leakage of each device in the oxygen-enriched combustion boiler to obtain the air leakage distribution of the oxygen-enriched combustion boiler, and then judge the air leakage location and size of the oxygen-enriched combustion boiler based on the air leakage distribution, which is beneficial for staff to eliminate defects and ensure the carbon dioxide enrichment performance of the boiler. Therefore, for a target device in the oxygen-enriched combustion boiler, it is necessary to be able to determine its air leakage. In the existing technology, there is a lack of effective and feasible methods for determining the air leakage of target equipment in the oxygen-enriched combustion boiler. Summary of the Invention

[0003] One object of the present invention is to provide a method for determining the air leakage rate of an oxy-fuel combustion boiler, thereby addressing the lack of an effective and feasible method for determining the air leakage rate of target equipment in an oxy-fuel combustion boiler. Another object of the present invention is to provide an apparatus for determining the air leakage rate of an oxy-fuel combustion boiler. Another object of the present invention is to provide a computer device. Yet another object of the present invention is to provide a readable medium.

[0004] In order to achieve the above objectives, one aspect of the present invention discloses a method for determining the air leakage of an oxy-fuel combustion boiler, the method comprising:

[0005] The smoke emission per unit mass of the received base coal is obtained according to the received base coal parameters and the carbon dioxide concentration detected at the flue gas recirculation extraction point;

[0006] Obtaining the total air leakage of the boiler and the amount of oxygen injected per unit mass of the received base coal according to 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, the atmospheric parameters, and the injected oxygen purity; and further obtaining the amount of condensed water vapor corresponding to the unit mass of the received base coal according to the total air leakage of the boiler and the exhaust volume, the water vapor concentration detected at the flue gas recirculation extraction point, the received base coal parameters, and the atmospheric parameters;

[0007] The amount of recycled 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 primary air oxygen injection parameters, the secondary air oxygen injection parameters, the drying air oxygen injection parameters, the oxygen injection purity, and the oxygen concentration detected at the flue gas recirculation extraction point;

[0008] The air leakage of the target equipment is obtained based on the received base coal parameters, the carbon dioxide concentration detected at the outlet of the target equipment, the carbon dioxide concentration detected at the outlet of the next adjacent equipment of the target equipment, the carbon dioxide concentration detected at the flue gas recirculation extraction point, the amount of condensed water vapor, the exhaust volume and the amount of recirculated flue gas.

[0009] Optionally, obtaining the smoke emission per unit mass of the received base coal according to the received base coal parameters and the carbon dioxide concentration detected at the flue gas recirculation extraction point includes:

[0010] Obtaining a carbon element quality index of the received base coal according to the received base coal parameters;

[0011] The smoke emission per unit mass of the received base coal is obtained according to 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 total air leakage of the boiler and the oxygen injection amount corresponding to the unit mass of the received base coal are obtained according to 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 the injected oxygen purity, including:

[0013] According to the received base coal parameters, a carbon element quality index, a hydrogen element quality index, an oxygen element quality index, a nitrogen element quality index, a sulfur element quality index and a moisture quality index of the received base coal are obtained;

[0014] Obtaining the absolute humidity of the atmosphere according to the atmospheric parameters;

[0015] Obtain the total air leakage of the boiler corresponding to a unit mass of the received base coal based on the carbon element quality index, hydrogen element quality index, oxygen element quality index, nitrogen element quality index, sulfur element quality index, moisture quality index, atmospheric absolute humidity, oxygen injection 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 of the received base coal;

[0016] According to 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 air leakage of the boiler, the oxygen injection amount corresponding to the unit mass of the base coal received is obtained.

[0017] Optionally, obtaining the amount of condensed water vapor corresponding to the unit mass of the received base coal according to the total air leakage of the boiler corresponding to the unit mass of the received base coal, the smoke exhaust volume, the water vapor concentration detected at the flue gas recirculation extraction point, the received base coal parameters, and the atmospheric parameters includes:

[0018] According to the received base coal parameters, a hydrogen element quality index and a moisture quality index of the received base coal are obtained;

[0019] Obtaining the absolute humidity of the atmosphere according to the atmospheric parameters;

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

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

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

[0023] According to the secondary air oxygen injection parameters, the oxygen concentration and the secondary air oxygen supply flow rate after the secondary air oxygen injection are obtained;

[0024] According to the dry air oxygen injection parameters, the oxygen concentration and dry air oxygen supply flow rate after the dry air oxygen injection are obtained;

[0025] The amount of recycled flue gas corresponding to the unit mass of base coal received is obtained based on the oxygen concentration after the primary air oxygen injection, the primary air oxygen supply flow rate, the oxygen concentration after the secondary air oxygen injection, the secondary air oxygen supply flow rate, the oxygen concentration after the dry air oxygen injection, the dry air oxygen supply flow rate, the oxygen injection amount corresponding to the unit mass of base coal received, the oxygen injection purity and the oxygen concentration obtained by detection at the flue gas recirculation extraction point.

[0026] Optionally, the total air leakage of the boiler corresponding to a unit mass of the received base coal is obtained according to the carbon element quality index, hydrogen element quality index, oxygen element quality index, nitrogen element quality index, sulfur element quality index, moisture quality index, absolute atmospheric humidity, oxygen injection 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 of the received base coal, including:

[0027] Obtaining the flue gas volume per unit mass of the base coal after complete combustion according to the carbon quality index, hydrogen quality index, nitrogen quality index, sulfur quality index, and moisture quality index;

[0028] According to the carbon element quality index, hydrogen element quality index, sulfur element quality index and oxygen element quality index, the theoretical amount of oxygen required for complete combustion of a unit mass of the received base coal is obtained;

[0029] Based on the amount of flue gas produced by complete combustion of the unit mass of the received base coal, the theoretical amount of oxygen required for complete combustion of the unit mass of the received base coal, the carbon element quality index, the hydrogen element quality index, the moisture quality index, the purity of injected oxygen, 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 air leakage of the boiler corresponding to the unit mass of the received base coal is obtained.

[0030] Optionally, the total air leakage of the boiler corresponding to the unit mass of the received base coal is obtained based on the flue gas volume of the completely burned unit mass of the received base coal, the theoretical amount of oxygen required for the complete combustion of the unit mass of the received base coal, the carbon element quality index, the hydrogen element quality index, the water quality index, the injected oxygen 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, including:

[0031] The amount of nitrogen in the total air leakage of the boiler corresponding to the unit mass of the received base coal is obtained based on the flue gas volume resulting from complete combustion of the unit mass of the received base coal, the theoretical amount of oxygen required for complete combustion of the unit mass of the received base coal, the carbon element quality index, the hydrogen element quality index, the water quality index, the purity of the injected oxygen, 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;

[0032] According to the injected oxygen purity and the absolute humidity of the atmosphere, the ratio of the amount of nitrogen in the total leakage air of the boiler corresponding to the unit mass of the base coal received is obtained;

[0033] According to the nitrogen amount and the ratio of the nitrogen amount, the total air leakage of the boiler corresponding to the unit mass of the base coal received is obtained.

[0034] Optionally, the oxygen injection amount corresponding to the unit mass of base coal received is obtained based on the injected 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 air leakage of the boiler, including:

[0035] Obtaining the chimney exhaust oxygen content corresponding to the unit mass of the received base coal 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;

[0036] According to the absolute humidity of the atmosphere and the total air leakage of the boiler, the amount of additional oxygen brought by the air leakage corresponding to the unit mass of the base coal received is obtained;

[0037] According to the carbon element quality index, hydrogen element quality index, sulfur element quality index and oxygen element quality index, the theoretical amount of oxygen required for complete combustion of a unit mass of the received base coal is obtained;

[0038] The oxygen injection amount corresponding to the unit mass of base coal received is obtained based on the oxygen content of the chimney exhaust gas, the additional oxygen amount brought by air leakage, the theoretical oxygen amount required for complete combustion and the purity of the injected oxygen.

[0039] Optionally, the amount of condensed water vapor corresponding to the unit mass of base coal received is obtained based on the hydrogen quality index, the moisture quality index, the absolute humidity of the atmosphere, the total air leakage of the boiler, the exhaust volume, and the water vapor concentration detected at the flue gas recirculation extraction point, including:

[0040] According to the hydrogen element quality index and the water quality index, the amount of water vapor generated by the combustion of the unit mass of the received base coal is obtained;

[0041] According to the absolute humidity of the atmosphere and the total air leakage of the boiler, the amount of water vapor in the air leakage corresponding to the unit mass of the base coal received is obtained;

[0042] Obtaining the amount of water vapor in the flue gas of the boiler corresponding to the unit mass of the base coal received based on the flue gas volume and the water vapor concentration detected at the flue gas recirculation extraction point;

[0043] The amount of condensed water vapor corresponding to the unit mass of the received base coal is obtained based on the amount of water vapor generated by the combustion of the unit mass of the received base coal, the amount of water vapor in the leakage air corresponding to the unit mass of the received base coal, and the amount of water vapor in the flue gas of the boiler exhaust corresponding to the unit mass of the received base coal.

[0044] Optionally, the amount of recycled flue gas corresponding to the unit mass of base coal received is obtained according to the oxygen concentration after the primary air oxygen injection, the primary air oxygen supply flow rate, the oxygen concentration after the secondary air oxygen injection, the secondary air oxygen supply flow rate, the oxygen concentration after the dry air oxygen injection, the dry air oxygen supply flow rate, the oxygen injection amount corresponding to the unit mass of base coal received, the oxygen injection purity and the oxygen concentration detected at the flue gas recirculation extraction point, including:

[0045] The amount of circulating flue gas before primary air oxygen injection in the recycled flue gas corresponding to the unit mass of base coal received is obtained based on the oxygen injection amount corresponding to the base coal received per unit mass, 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;

[0046] The amount of circulating flue gas before secondary air oxygen injection in the recycled 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 secondary air oxygen injection, the oxygen purity of the injected oxygen, 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;

[0047] The amount of circulating flue gas before dry air oxygen injection in the recycled flue gas corresponding to the unit mass of base coal received is obtained based on the oxygen injection amount corresponding to the base coal received per unit mass, the oxygen concentration after dry 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 dry air oxygen supply flow rate;

[0048] According to the circulating flue gas volume before primary air oxygen injection, the circulating flue gas volume before secondary air oxygen injection and the circulating flue gas volume before drying air oxygen injection in the recycled flue gas corresponding to the unit mass of base coal received, the recycled flue gas volume corresponding to the unit mass of base coal received is obtained.

[0049] Optionally, obtaining the target equipment air leakage amount based on the received base coal parameters, the carbon dioxide concentration detected at the target equipment outlet, the carbon dioxide concentration detected at the outlet of the next adjacent equipment of the target equipment, the carbon dioxide concentration detected at the flue gas recirculation extraction point, the amount of condensed water vapor, the exhaust volume, and the amount of recirculated flue gas includes:

[0050] According to the received base coal parameters, the power generation load, heating load and unit coal consumption provided by the power plant SIS system are obtained, thereby obtaining the received base coal mass flow rate according to the power generation load, heating load and unit coal consumption provided by the power plant SIS system;

[0051] The air leakage volume between the target equipment and the flue gas recirculation extraction point corresponding to the unit mass of base coal received is obtained based on the condensed water vapor volume, the exhaust volume, the recirculated flue gas volume, the carbon dioxide concentration detected at the flue gas recirculation extraction point, and the carbon dioxide concentration detected at the outlet of the target equipment;

[0052] The air leakage volume between the next adjacent device of the target device and the flue gas recirculation extraction point is obtained based on the condensed water vapor volume, the exhaust smoke volume, the recirculated flue gas volume, the carbon dioxide concentration detected at the flue gas recirculation extraction point, and the carbon dioxide concentration detected at the outlet of the next adjacent device of the target device;

[0053] The air leakage of the target equipment is obtained based on the air leakage between the target equipment corresponding to the unit mass of the received base coal and the flue gas recirculation extraction point, the air leakage between the next adjacent equipment of the target equipment corresponding to the unit mass of the received base coal and the flue gas recirculation extraction point, and the mass flow rate of the received base coal.

[0054] Optionally, obtaining the target equipment air leakage according to the air leakage between the target equipment corresponding to the unit mass of the received base coal and the flue gas recirculation extraction point, the air leakage between the next adjacent equipment of the target equipment corresponding to the unit mass of the received base coal and the flue gas recirculation extraction point, and the received base coal mass flow rate includes:

[0055] The air leakage volume between the target device corresponding to the base coal received per unit mass and the flue gas recirculation extraction point is subtracted from the air leakage volume between the next adjacent device of the target device corresponding to the base coal received per unit mass and the flue gas recirculation extraction point to obtain the air leakage volume of the target device corresponding to the base coal received per unit mass;

[0056] The target equipment air leakage corresponding to the unit mass of the received base coal is multiplied by the mass flow rate of the received base coal to obtain the target equipment air leakage.

[0057] In order to achieve the above objectives, another aspect of the present invention discloses a device for determining the air leakage rate of an oxy-fuel combustion boiler, the device comprising:

[0058] The smoke emission determination module is used to obtain the smoke emission per unit mass of the received base coal according to the received base coal parameters and the carbon dioxide concentration detected at the flue gas recirculation extraction point;

[0059] a condensed water vapor amount determination module, configured to determine the total boiler air leakage and oxygen injection amount 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 the injected oxygen purity; and further determine the condensed water vapor amount corresponding to a unit mass of received base coal based on the total boiler air leakage, smoke exhaust, the water vapor concentration detected at the flue gas recirculation extraction point, the received base coal parameters, and the atmospheric parameters;

[0060] a recirculated flue gas volume determination module, configured to determine the recirculated flue gas volume corresponding to the base coal received per unit mass based on the oxygen injection volume corresponding to the base coal received per unit mass, the primary air oxygen injection parameters, the secondary air oxygen injection parameters, the drying air oxygen injection parameters, the oxygen injection purity, and the oxygen concentration detected at the flue gas recirculation extraction point;

[0061] The target equipment air leakage determination module is used to obtain the target equipment air leakage based on the received base coal parameters, the carbon dioxide concentration detected at the target equipment outlet, the carbon dioxide concentration detected at the outlet of the next adjacent equipment of the target equipment, the carbon dioxide concentration detected at the flue gas recirculation extraction point, the condensed water vapor volume, the exhaust volume and the recirculated flue gas volume.

[0062] The present invention also discloses a computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the method described above is implemented when the processor executes the program.

[0063] The present invention also discloses a computer-readable medium on which a computer program is stored. When the program is executed by a processor, the method described above is implemented.

[0064] The method and device for determining the air leakage rate of an oxygen-enriched combustion boiler provided by the present invention obtain the smoke exhaust rate per unit mass of received base coal based on the received base coal parameters and the carbon dioxide concentration obtained by detection at the flue gas recirculation extraction point. This can provide the required input parameters for the subsequent steps of determining the air leakage rate of the target equipment in the oxygen-enriched combustion boiler, and replace the form of measuring the smoke exhaust rate with a measuring instrument with the form of calculation, thereby reducing the cost of determining the smoke exhaust rate per unit mass of received base coal, and indirectly reducing the cost of determining the air leakage rate of the target equipment in the oxygen-enriched combustion boiler. By obtaining the total air leakage and oxygen injection amount of the boiler corresponding to the unit mass of the 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, the atmospheric parameters and the oxygen injection purity, the required input parameters can be provided for the subsequent steps of determining the air leakage amount of the target equipment in the oxygen-enriched combustion boiler, and the number and scale of measuring instruments required to determine the total air leakage and oxygen injection amount of the boiler corresponding to the unit mass of the received base coal can be effectively reduced, thereby reducing the cost of determining the total air leakage and oxygen injection amount of the boiler corresponding to the unit mass of the received base coal, and indirectly reducing the cost of determining the air leakage amount of the target equipment in the oxygen-enriched combustion boiler. By obtaining the amount of condensed water vapor corresponding to the unit mass of received base coal based on the total air leakage of the boiler corresponding to the unit mass of received base coal, the smoke exhaust volume, the water vapor concentration detected at the flue gas recirculation extraction point, the received base coal parameters and the atmospheric parameters, it is possible to determine the amount of condensed water vapor corresponding to the unit mass of received base coal, thereby providing the required input parameters for the subsequent step of determining the air leakage of the target equipment in the oxygen-enriched combustion boiler. By obtaining the amount of recycled flue gas corresponding to the unit mass of base coal received based on the oxygen injection amount corresponding to the unit mass of base coal received, 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, the required input parameters can be provided for the subsequent step of determining the air leakage amount of the target equipment in the oxygen-enriched combustion boiler, and it can be achieved that when determining the recycled flue gas amount, only the primary air oxygen injection parameters, the secondary air oxygen injection parameters, the dry air oxygen injection parameters and the oxygen concentration detected at the flue gas recirculation extraction point need to be collected, which effectively reduces the number and scale of measuring instruments required to determine the amount of recycled flue gas corresponding to the unit mass of base coal received, thereby reducing the cost of determining the amount of recycled flue gas corresponding to the unit mass of base coal received, and indirectly reducing the cost of determining the air leakage amount of the target equipment in the oxygen-enriched combustion boiler.By obtaining the target device air leakage according to the received base coal parameters, the carbon dioxide concentration detected at the outlet of the target device, the carbon dioxide concentration detected at the outlet of the next adjacent device of the target device, the carbon dioxide concentration detected at the flue gas recirculation extraction point, the amount of condensed water vapor, the exhaust volume and the amount of recirculated flue gas, it is possible to make the determination of the target device air leakage in the oxygen-enriched combustion boiler feasible while minimizing the number of parameters required to be collected in the determination process, thereby minimizing the number and scale of equipment required for determining the target device air leakage in the oxygen-enriched combustion boiler, thereby effectively reducing the cost of determining the target device air leakage in the oxygen-enriched combustion boiler. In summary, the method and device for determining the air leakage of an oxygen-enriched combustion boiler provided by the present invention can make the determination of the target device air leakage in the oxygen-enriched combustion boiler feasible, and reduce the number of equipment required for determining the target device air leakage, thereby effectively reducing the cost of determining the target device air leakage in the oxygen-enriched combustion boiler. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0066] Figure 1 A schematic flow chart showing a method for determining air leakage of an oxy-fuel combustion boiler according to an embodiment of the present invention is shown;

[0067] Figure 2 A schematic diagram showing an optional step of obtaining the total air leakage and oxygen injection rate of a boiler corresponding to a unit mass of base coal received according to an embodiment of the present invention is shown;

[0068] Figure 3 A schematic diagram showing an optional step of obtaining the amount of condensed water vapor corresponding to a unit mass of base coal received according to an embodiment of the present invention is shown;

[0069] Figure 4 A schematic diagram showing an optional step of obtaining the amount of recycled flue gas corresponding to a unit mass of received base coal according to an embodiment of the present invention is shown;

[0070] Figure 5 A schematic diagram showing an optional step of obtaining the target equipment air leakage rate according to an embodiment of the present invention is shown;

[0071] Figure 6 A schematic diagram of a module of a device for determining air leakage of an oxy-fuel combustion boiler according to an embodiment of the present invention is shown;

[0072] Figure 7A schematic diagram showing the structure of a computer device suitable for implementing an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0073] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0074] The terms “first,” “second,” etc. used herein do not particularly refer to an order or sequence, nor are they used to limit the present invention. They are only used to distinguish elements or operations described with the same technical terms.

[0075] The words “include,” “including,” “have,” “contain,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0076] As used herein, "and / or" includes any and all combinations of the items mentioned.

[0077] It should be noted that the acquisition, storage, use, and processing of data in the technical solution of the present invention are in compliance with the relevant provisions of national laws and regulations.

[0078] The embodiment of the present invention discloses a method for determining the air leakage of an oxygen-enriched combustion boiler. Figure 1 As shown, the method specifically includes the following steps:

[0079] S101: Obtain the smoke exhaust per unit mass of the received base coal according to the received base coal parameters and the carbon dioxide concentration detected at the flue gas recirculation extraction point.

[0080] S102: According to 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, the atmospheric parameters and the oxygen injection purity, the total air leakage of the boiler and the oxygen injection amount corresponding to the unit mass of the received base coal are obtained; and then, according to the total air leakage of the boiler corresponding to the unit mass of the received base coal, the smoke exhaust volume, the water vapor concentration detected at the flue gas recirculation extraction point, the received base coal parameters and the atmospheric parameters, the amount of condensed water vapor corresponding to the unit mass of the received base coal is obtained.

[0081] S103: The recycled flue gas volume corresponding to the base coal received per unit mass is obtained based on the oxygen injection volume corresponding to the base coal received per unit mass, the primary air oxygen injection parameters, the secondary air oxygen injection parameters, the drying air oxygen injection parameters, the oxygen injection purity and the oxygen concentration detected at the flue gas recirculation extraction point.

[0082] S104: The air leakage of the target equipment is obtained based on the received base coal parameters, the carbon dioxide concentration detected at the outlet of the target equipment, the carbon dioxide concentration detected at the outlet of the next adjacent equipment of the target equipment, the carbon dioxide concentration detected at the flue gas recirculation extraction point, the amount of condensed water vapor, the exhaust volume and the recirculated flue gas volume.

[0083] The method and device for determining the air leakage rate of an oxygen-enriched combustion boiler provided by the present invention obtain the smoke exhaust rate per unit mass of received base coal based on the received base coal parameters and the carbon dioxide concentration obtained by detection at the flue gas recirculation extraction point. This can provide the required input parameters for the subsequent steps of determining the air leakage rate of the target equipment in the oxygen-enriched combustion boiler, and replace the form of measuring the smoke exhaust rate with a measuring instrument with the form of calculation, thereby reducing the cost of determining the smoke exhaust rate per unit mass of received base coal, and indirectly reducing the cost of determining the air leakage rate of the target equipment in the oxygen-enriched combustion boiler. By obtaining the total air leakage and oxygen injection amount of the boiler corresponding to the unit mass of the 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, the atmospheric parameters and the oxygen injection purity, the required input parameters can be provided for the subsequent steps of determining the air leakage amount of the target equipment in the oxygen-enriched combustion boiler, and the number and scale of measuring instruments required to determine the total air leakage and oxygen injection amount of the boiler corresponding to the unit mass of the received base coal can be effectively reduced, thereby reducing the cost of determining the total air leakage and oxygen injection amount of the boiler corresponding to the unit mass of the received base coal, and indirectly reducing the cost of determining the air leakage amount of the target equipment in the oxygen-enriched combustion boiler. By obtaining the amount of condensed water vapor corresponding to the unit mass of received base coal based on the total air leakage of the boiler corresponding to the unit mass of received base coal, the smoke exhaust volume, the water vapor concentration detected at the flue gas recirculation extraction point, the received base coal parameters and the atmospheric parameters, it is possible to determine the amount of condensed water vapor corresponding to the unit mass of received base coal, thereby providing the required input parameters for the subsequent step of determining the air leakage of the target equipment in the oxygen-enriched combustion boiler. By obtaining the amount of recycled flue gas corresponding to the unit mass of base coal received based on the oxygen injection amount corresponding to the unit mass of base coal received, 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, the required input parameters can be provided for the subsequent step of determining the air leakage amount of the target equipment in the oxygen-enriched combustion boiler, and it can be achieved that when determining the recycled flue gas amount, only the primary air oxygen injection parameters, the secondary air oxygen injection parameters, the dry air oxygen injection parameters and the oxygen concentration detected at the flue gas recirculation extraction point need to be collected, which effectively reduces the number and scale of measuring instruments required to determine the amount of recycled flue gas corresponding to the unit mass of base coal received, thereby reducing the cost of determining the amount of recycled flue gas corresponding to the unit mass of base coal received, and indirectly reducing the cost of determining the air leakage amount of the target equipment in the oxygen-enriched combustion boiler.By obtaining the target device air leakage according to the received base coal parameters, the carbon dioxide concentration detected at the outlet of the target device, the carbon dioxide concentration detected at the outlet of the next adjacent device of the target device, the carbon dioxide concentration detected at the flue gas recirculation extraction point, the amount of condensed water vapor, the exhaust volume and the amount of recirculated flue gas, it is possible to make the determination of the target device air leakage in the oxygen-enriched combustion boiler feasible while minimizing the number of parameters required to be collected in the determination process, thereby minimizing the number and scale of equipment required for determining the target device air leakage in the oxygen-enriched combustion boiler, thereby effectively reducing the cost of determining the target device air leakage in the oxygen-enriched combustion boiler. In summary, the method and device for determining the air leakage of an oxygen-enriched combustion boiler provided by the present invention can make the determination of the target device air leakage in the oxygen-enriched combustion boiler feasible, and reduce the number of equipment required for determining the target device air leakage, thereby effectively reducing the cost of determining the target device air leakage in the oxygen-enriched combustion boiler.

[0084] In an optional embodiment, obtaining the smoke emission per unit mass of the received base coal according to the received base coal parameters and the carbon dioxide concentration detected at the flue gas recirculation extraction point includes:

[0085] Obtaining a carbon element quality index of the received base coal according to the received base coal parameters;

[0086] The smoke emission per unit mass of the received base coal is obtained according to the carbon element quality index of the received base coal and the carbon dioxide concentration detected at the flue gas recirculation extraction point.

[0087] For example, the received base coal parameters include but are not limited to the received base coal mass flow rate coal (i.e., received base coal mass flow rate), 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 the moisture quality index M ar Therefore, the carbon element quality index of the received base coal can be directly obtained based on the received base coal parameters. For an element or substance, the quality index refers to the value obtained by multiplying the mass of the element or substance as a percentage of the mass of the received base coal by 100, that is, the value obtained by multiplying the mass fraction of the element or substance in the received base coal by 100. The quality index is one of the commonly used parameters in this field.

[0088] For example, the carbon element quality index of the received base coal and the carbon dioxide concentration detected at the flue gas recirculation extraction point are used. The smoke exhaust volume V3 per unit mass of base coal can be obtained by, but not limited to, the following formula:

[0089]

[0090] For example, the flue gas recirculation extraction point may be, but is not limited to, the exhaust duct from the flue gas cooler to the chimney of an oxy-fuel combustion boiler, or the exhaust duct from the flue gas cooler to the air preheater. 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 actual circumstances, and the above description is for illustrative purposes only and does not constitute a limitation.

[0091] For example, the unit mass may be, but is not limited to, 1 kg.

[0092] Exemplarily, the flue gas emission per unit mass of the received base coal is the volume of flue gas discharged from the chimney of the oxygen-enriched combustion boiler after the unit mass of the received base coal is burned.

[0093] Through the above steps, on the basis of reducing the cost of determining the exhaust volume per unit mass of base coal received, it is possible to further determine the exhaust volume based on the principles of thermophysical properties and related chemical properties, thereby improving the accuracy of the determined exhaust volume per unit mass of base coal received.

[0094] In an optional embodiment, if Figure 2 As shown, the method of obtaining the total air leakage of the boiler and the oxygen injection amount corresponding to the unit mass of the received base coal according to the received base coal parameters, the carbon dioxide concentration detected by the flue gas recirculation extraction point, the oxygen concentration detected by the flue gas recirculation extraction point, the water vapor concentration detected by the flue gas recirculation extraction point, the atmospheric parameters and the injected oxygen purity includes the following steps:

[0095] S201: Obtaining a carbon element quality index, a hydrogen element quality index, an oxygen element quality index, a nitrogen element quality index, a sulfur element quality index, and a moisture quality index of the received base coal according to the received base coal parameters.

[0096] S202: Obtaining the absolute humidity of the atmosphere according to the atmospheric parameters.

[0097] S203: According to the carbon element quality index, hydrogen element quality index, oxygen element quality index, nitrogen element quality index, sulfur element quality index, moisture quality index, atmospheric absolute humidity, oxygen injection 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 of the received base coal, the total air leakage of the boiler corresponding to the unit mass of the received base coal is obtained.

[0098] S204: According to the injected 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 air leakage of the boiler, the injected oxygen amount corresponding to the unit mass of the base coal received is obtained.

[0099] Exemplarily, obtaining 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 according to the received base coal parameters is a conventional technical means in this field and will not be repeated here.

[0100] For example, the atmospheric parameters include but are not limited to the absolute humidity d k , atmospheric pressure, etc. Therefore, the absolute atmospheric humidity can be directly obtained according to the atmospheric parameters.

[0101] For example, the injected oxygen purity x may be, but is not limited to, the purity of oxygen injected into the oxy-combustion boiler obtained from an oxygen supplier.

[0102] 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 are It is detected by, but not limited to, a concentration sensor preset at the flue gas recirculation extraction point.

[0103] For example, the water vapor concentration detected at the flue gas recirculation extraction point is It is detected by, but not limited to, a concentration sensor preset at the flue gas recirculation extraction point.

[0104] In a preferred embodiment, the water vapor concentration detected at the flue gas recirculation extraction point is obtained by first obtaining the flue gas condensation temperature t at the extraction point through a temperature sensor. H2O,imax , and then use the flue gas condensation temperature as input, and calculate it through the thermophysical properties of water vapor or query the existing water vapor thermophysical property table to obtain it.

[0105] It should be noted that in the embodiments of the present invention, the term "per unit mass of base coal received..." refers to the amount of substance or energy required, generated, resulting in the inflow or consumption of a unit mass of base coal received in an oxy-fuel combustion boiler. It should be noted that the above terms are provided for illustrative purposes only and are not exhaustive, and therefore do not constitute a limitation of the present invention.

[0106] Through the above steps, the total air leakage of the boiler corresponding to the unit mass of base coal received can be obtained. and oxygen injection While reducing the cost of determining the total air leakage and oxygen injection amount of the boiler corresponding to the unit mass of base coal received, it is possible to further determine the total air leakage and oxygen injection amount of the boiler corresponding to the unit mass of base coal received based on multiple parameters closely related to the total air leakage and oxygen injection amount, thereby improving the accuracy of the determined total air leakage and oxygen injection amount of the boiler corresponding to the unit mass of base coal received.

[0107] In an optional embodiment, if Figure 3 As shown, the method of obtaining the amount of condensed water vapor corresponding to the unit mass of the received base coal according to the total air leakage of the boiler corresponding to the unit mass of the received base coal, the smoke exhaust volume, the water vapor concentration detected at the flue gas recirculation extraction point, the received base coal parameters and the atmospheric parameters includes the following steps:

[0108] S301: Obtaining a hydrogen element quality index and a moisture quality index of the received base coal according to the received base coal parameters.

[0109] S302: Obtaining the absolute humidity of the atmosphere according to the atmospheric parameters.

[0110] S303: Obtain the amount of condensed water vapor corresponding to the unit mass of the base coal received based on the hydrogen quality index, the moisture quality index, the absolute humidity of the atmosphere, the total air leakage of the boiler, the exhaust volume, and the water vapor concentration detected at the flue gas recirculation extraction point.

[0111] Exemplarily, obtaining the hydrogen element quality index and the moisture quality index of the received base coal according to the received base coal parameters is a conventional technical means in the art and will not be described in detail here.

[0112] Exemplarily, obtaining the absolute humidity of the atmosphere based on the atmospheric parameters is a conventional technical means in the art and will not be described in detail here.

[0113] Exemplarily, 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 oxy-fuel combustion boiler.

[0114] Through the above steps, the amount of condensed water vapor corresponding to the unit mass of base coal received is obtained While making it feasible to determine the amount of condensed water vapor corresponding to the unit mass of base coal received, it is further possible to determine the amount of condensed water vapor corresponding to the unit mass of base coal received 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 the unit mass of base coal received.

[0115] In an optional embodiment, if Figure 4As shown, the method of obtaining the recycled flue gas volume corresponding to the unit mass of the base coal received according to the oxygen injection volume corresponding to the unit mass of the base coal received, the primary air oxygen injection parameters, the secondary air oxygen injection parameters, the drying air oxygen injection parameters, the oxygen injection purity and the oxygen concentration detected at the flue gas recirculation extraction point includes the following steps:

[0116] S401: Obtaining the oxygen concentration and the primary air oxygen supply flow rate after the primary air oxygen injection according to the primary air oxygen injection parameters.

[0117] S402: Obtaining the oxygen concentration and secondary air oxygen supply flow rate after secondary air oxygen injection according to the secondary air oxygen injection parameters.

[0118] S403: Obtaining the oxygen concentration and the oxygen supply flow rate of the dry air after the dry air oxygen injection according to the dry air oxygen injection parameters.

[0119] S404: The amount of recycled flue gas corresponding to the unit mass of base coal received is obtained based on the oxygen concentration after the primary air oxygen injection, the primary air oxygen supply flow rate, the oxygen concentration after the secondary air oxygen injection, the secondary air oxygen supply flow rate, the oxygen concentration after the dry air oxygen injection, the dry air oxygen supply flow rate, the oxygen injection amount corresponding to the unit mass of base coal received, the oxygen injection purity and the oxygen concentration detected at the flue gas recirculation extraction point.

[0120] For example, the primary air oxygen injection parameters may be, but are not limited to, collected from a preset sensor in the primary air channel of the oxy-fuel combustion boiler. The primary air oxygen injection parameters include, but are not limited to, the oxygen concentration r after primary air oxygen injection. O2,pr,mix and primary air oxygen flow v O2,pr,in Therefore, the oxygen concentration and the primary air oxygen supply flow rate after the primary air oxygen injection can be directly obtained according to the primary air oxygen injection parameters.

[0121] For example, the secondary air oxygen injection parameters may be, but are not limited to, collected from a preset sensor in the secondary air channel of the oxy-fuel combustion boiler. The secondary air oxygen injection parameters include, but are not limited to, the oxygen concentration r after the secondary air oxygen injection. O2,se,mix and secondary air oxygen flow v O2,se,in Therefore, the oxygen concentration and secondary air oxygen supply flow rate after secondary air oxygen injection can be directly obtained according to the secondary air oxygen injection parameters.

[0122] For example, the dry air oxygen injection parameters may be, but are not limited to, those collected from a preset sensor in the dry air channel of the oxy-fuel combustion boiler. The dry air oxygen injection parameters include, but are not limited to, the oxygen concentration r after dry air oxygen injection. O2,vent,mix and dry air oxygen flow v O2,vent,in Therefore, the oxygen concentration and dry air oxygen supply flow rate after dry air oxygen injection can be directly obtained according to the dry air oxygen injection parameters.

[0123] For example, the unit of the above flow rate can be, but is not limited to, m 3 / s.

[0124] Exemplarily, the recirculated flue gas volume is the volume of the flue gas passing through the flue gas recirculation pipeline in the oxy-fuel combustion boiler.

[0125] The recycled flue gas volume V2 corresponding to the unit mass of base coal received is obtained through the above steps. While reducing the cost of determining the recycled flue gas volume corresponding to the unit mass of base coal received, it is possible to further determine the recycled flue gas volume corresponding to the unit mass of base coal received based on multiple parameters closely related to the recycled flue gas volume (determined by the structure of the existing oxygen-enriched combustion boiler and relevant physical and chemical properties), thereby improving the accuracy of the determined recycled flue gas volume corresponding to the unit mass of base coal received.

[0126] In an optional embodiment, the total air leakage of the boiler corresponding to the unit mass of the received base coal is obtained according to the carbon element quality index, hydrogen element quality index, oxygen element quality index, nitrogen element quality index, sulfur element quality index, moisture quality index, atmospheric absolute humidity, oxygen injection 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 of the received base coal, including:

[0127] Obtaining the flue gas volume per unit mass of the base coal after complete combustion according to the carbon quality index, hydrogen quality index, nitrogen quality index, sulfur quality index, and moisture quality index;

[0128] According to the carbon element quality index, hydrogen element quality index, sulfur element quality index and oxygen element quality index, the theoretical amount of oxygen required for complete combustion of a unit mass of the received base coal is obtained;

[0129] Based on the amount of flue gas produced by complete combustion of the unit mass of the received base coal, the theoretical amount of oxygen required for complete combustion of the unit mass of the received base coal, the carbon element quality index, the hydrogen element quality index, the moisture quality index, the purity of injected oxygen, 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 air leakage of the boiler corresponding to the unit mass of the received base coal is obtained.

[0130] Exemplarily, the carbon 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, get the flue gas volume per unit mass of base coal completely burned This can be achieved through but not limited to the following formula:

[0131]

[0132] The amount of flue gas per unit mass generated by complete combustion of the received base coal may be, but is not limited to, the volume of flue gas generated by complete combustion of 1 kg of received base coal under standard conditions.

[0133] It should be noted that the specific implementation method for obtaining the flue gas volume per unit mass of the base coal after complete combustion can be determined by those skilled in the art according to actual conditions. The above description is only an example and does not constitute a limitation thereto.

[0134] Through the above steps, the flue gas volume per unit mass of the base coal can be calculated by the relevant chemical properties, thereby improving the accuracy of the obtained flue gas volume per unit mass of the base coal, and thus improving the subsequent steps. The accuracy of the parameters obtained as input.

[0135] Exemplarily, the carbon quality index C ar , Hydrogen element quality index H ar , Sulfur element quality index S ar and oxygen element quality index O ar , get the theoretical amount of oxygen required for complete combustion of unit mass of base coal This can be achieved through but not limited to the following formula:

[0136]

[0137] The theoretical amount of oxygen required for complete combustion of the received base coal per unit mass may be, but is not limited to, the theoretical volume of oxygen required for complete combustion of 1 kg of received base coal.

[0138] It should be noted that the specific implementation method for obtaining the theoretical amount of oxygen required for complete combustion of a unit mass of base coal can be determined by those skilled in the art based on actual conditions. The above description is only an example and does not constitute a limitation thereto.

[0139] The above steps are also calculated based on the relevant chemical properties. Therefore, the obtained The accuracy of The accuracy of the parameters obtained as input.

[0140] The total air leakage of the boiler corresponding to the unit mass of base coal received is obtained based on the amount of flue gas obtained by complete combustion of the unit mass of base coal received, the theoretical amount of oxygen required for complete combustion of the unit mass of base coal received, the carbon element quality index, the hydrogen element quality index, the moisture quality index, the oxygen injection purity, the oxygen concentration obtained by detecting the flue gas recirculation extraction point, the carbon dioxide concentration obtained by detecting the flue gas recirculation extraction point, the water vapor concentration obtained by detecting the flue gas recirculation extraction point and the absolute humidity of the atmosphere. This is achieved based on the gas flow characteristics and structure of the oxygen-enriched combustion boiler, as well as the relevant thermal physical properties and chemical properties. Therefore, the above-mentioned input variables are closely related to the total air leakage of the boiler corresponding to the unit mass of base coal received, thereby improving the accuracy of the determined total air leakage of the boiler and achieving the use of as few parameters as possible that require measuring equipment to obtain, thereby reducing the number of required measuring equipment and further reducing costs.

[0141] In an optional embodiment, the total air leakage of the boiler corresponding to the unit mass of the received base coal is obtained based on the flue gas volume of the unit mass of the received base coal after complete combustion, the theoretical amount of oxygen required for complete combustion of the unit mass of the received base coal, the carbon element quality index, the hydrogen element quality index, the water quality index, the injected oxygen 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, including:

[0142] The amount of nitrogen in the total air leakage of the boiler corresponding to the unit mass of the received base coal is obtained based on the flue gas volume resulting from complete combustion of the unit mass of the received base coal, the theoretical amount of oxygen required for complete combustion of the unit mass of the received base coal, the carbon element quality index, the hydrogen element quality index, the water quality index, the purity of the injected oxygen, 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;

[0143] According to the injected oxygen purity and the absolute humidity of the atmosphere, the ratio of the amount of nitrogen in the total leakage air of the boiler corresponding to the unit mass of the base coal received is obtained;

[0144] According to the nitrogen amount and the ratio of the nitrogen amount, the total air leakage of the boiler corresponding to the unit mass of the base coal received is obtained.

[0145] For example, the total air leakage of the boiler corresponding to the unit mass of base coal received is It can be determined by but not limited to the following formula:

[0146]

[0147] The meaning of the variables is as follows: the amount of flue gas per unit mass received when the base coal is completely burned The theoretical amount of oxygen required for complete combustion of unit mass of base coal Carbon element quality index C ar , Hydrogen element quality index H ar , moisture quality index M ar , oxygen injection purity x, oxygen concentration detected at the flue gas recirculation extraction point Carbon dioxide concentration detected at the flue gas recirculation extraction point and water vapor concentration detected at the flue gas recirculation extraction point Absolute humidity of the atmosphere d k .

[0148] For example, the amount of nitrogen in the total boiler air leakage corresponding to the base coal received per unit mass is the numerator in the above formula:

[0149]

[0150] For example, the ratio of the nitrogen content in the total air leakage of the boiler corresponding to the unit mass of the base coal is the denominator in the above formula:

[0151]

[0152] It should be noted that the specific implementation method for obtaining the total air leakage of the boiler corresponding to the unit mass of base coal received can be determined by those skilled in the art according to actual conditions. The above description is only an example and does not constitute a limitation to this.

[0153] The total air leakage of the boiler corresponding to the unit mass of base coal received is obtained through the above steps, which is also achieved based on the relevant physical and chemical properties, the gas flow characteristics of the oxygen-enriched combustion boiler and the structure of the oxygen-enriched combustion boiler. Therefore, the accuracy of the total air leakage of the boiler corresponding to the unit mass of base coal received can be improved, thereby improving the accuracy of the air leakage of the target equipment determined in the subsequent steps, and achieving the minimum use of parameters that require measuring equipment to obtain, thereby reducing the number of required measuring equipment and further reducing costs.

[0154] In an optional embodiment, the oxygen injection amount corresponding to the unit mass of base coal received is obtained based on the injected 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 air leakage of the boiler, including:

[0155] Obtaining the chimney exhaust oxygen content corresponding to the unit mass of the received base coal 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;

[0156] According to the absolute humidity of the atmosphere and the total air leakage of the boiler, the amount of additional oxygen brought by the air leakage corresponding to the unit mass of the base coal received is obtained;

[0157] According to the carbon element quality index, hydrogen element quality index, sulfur element quality index and oxygen element quality index, the theoretical amount of oxygen required for complete combustion of a unit mass of the received base coal is obtained;

[0158] The oxygen injection amount corresponding to the unit mass of base coal received is obtained based on the oxygen content of the chimney exhaust gas, the additional oxygen amount brought by air leakage, the theoretical oxygen amount required for complete combustion and the purity of the injected oxygen.

[0159] For example, the oxygen injection amount corresponding to the base coal received per unit mass is It can be determined by but not limited to the following formula:

[0160]

[0161] Among them, the meanings of the variables are as follows: Carbon element quality index C ar , oxygen concentration detected at the flue gas recirculation extraction point 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 complete combustion of unit mass of base coal Injected oxygen purity x.

[0162] It should be noted that the determination of the amount of oxygen injected per unit mass of base coal can be determined by those skilled in the art based on actual conditions. The above description is only an example and does not constitute a limitation thereto.

[0163] For example, the amount of oxygen brought in by the leakage of air corresponding to the unit mass of the base coal is

[0164] For example, the specific implementation method of obtaining the theoretical amount of oxygen required for complete combustion of unit mass of base coal based on the carbon element quality index, hydrogen element quality index, sulfur element quality index and oxygen element quality index has been explained in the embodiments of the present invention and will not be repeated here.

[0165] For example, the chimney exhaust oxygen content corresponding to the unit mass of base coal is

[0166] The oxygen injection amount corresponding to the unit mass of base coal received is obtained through the above steps, which is also achieved based on the relevant physical and chemical properties, the gas flow characteristics of the oxygen-enriched combustion boiler and the structure of the oxygen-enriched combustion boiler. Therefore, the accuracy of the oxygen injection amount corresponding to the unit mass of base coal received can be improved, thereby improving the accuracy of the target equipment leakage determined in the subsequent steps, and achieving the minimum use of parameters that require measuring equipment to obtain, thereby reducing the number of required measuring equipment and further reducing costs.

[0167] In an optional embodiment, the amount of condensed water vapor corresponding to the unit mass of base coal received is obtained based on the hydrogen quality index, the moisture quality index, the absolute humidity of the atmosphere, the total air leakage of the boiler, the exhaust volume, and the water vapor concentration detected at the flue gas recirculation extraction point, including:

[0168] According to the hydrogen element quality index and the water quality index, the amount of water vapor generated by the combustion of the unit mass of the received base coal is obtained;

[0169] According to the absolute humidity of the atmosphere and the total air leakage of the boiler, the amount of water vapor in the air leakage corresponding to the unit mass of the base coal received is obtained;

[0170] Obtaining the amount of water vapor in the flue gas of the boiler corresponding to the unit mass of the base coal received based on the flue gas volume and the water vapor concentration detected at the flue gas recirculation extraction point;

[0171] The amount of condensed water vapor corresponding to the unit mass of the received base coal is obtained based on the amount of water vapor generated by the combustion of the unit mass of the received base coal, the amount of water vapor in the leakage air corresponding to the unit mass of the received base coal, and the amount of water vapor in the flue gas of the boiler exhaust corresponding to the unit mass of the received base coal.

[0172] For example, the amount of condensed water vapor received per unit mass of base coal is It can be determined by but not limited to the following formula:

[0173]

[0174] The meanings of the variables are 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 Smoke exhaust volume V3, water vapor concentration detected at the flue gas recirculation extraction point

[0175] It should be noted that the amount of condensed water vapor corresponding to the unit mass of base coal received can be determined by those skilled in the art based on actual conditions. The above description is only an example and does not constitute a limitation thereto.

[0176] For example, the amount of water vapor generated by the combustion of the base coal per unit mass is 0.111H ar +0.0124M ar .

[0177] For example, the amount of water vapor in the air leakage corresponding to the base coal received per unit mass is

[0178] For example, the amount of water vapor in the flue gas of the boiler corresponding to the base coal received per unit mass is

[0179] The condensed water vapor amount corresponding to the unit mass of the base coal received, obtained through the above steps, is also achieved based on the relevant physical and chemical properties, the gas flow characteristics of the oxy-fuel combustion boiler, and the structure of the oxy-fuel combustion boiler. Therefore, the accuracy of the obtained condensed water vapor amount corresponding to the unit mass of the base coal received can be improved, thereby improving the accuracy of the target equipment air leakage rate determined in subsequent steps. The method also minimizes the use of parameters that require measurement equipment, thereby reducing the amount of measurement equipment required and, in turn, reducing costs. Furthermore, the problem of condensed water vapor amount being difficult to directly measure using measurement equipment is overcome.

[0180] In an optional embodiment, the method of obtaining the amount of recycled flue gas corresponding to the base coal received per unit mass according to the oxygen concentration after the primary air oxygen injection, the primary air oxygen supply flow rate, the oxygen concentration after the secondary air oxygen injection, the secondary air oxygen supply flow rate, the oxygen concentration after the dry air oxygen injection, the dry air oxygen supply flow rate, the oxygen injection amount corresponding to the base coal received per unit mass, the oxygen injection purity, and the oxygen concentration detected at the flue gas recirculation extraction point includes:

[0181] The amount of circulating flue gas before primary air oxygen injection in the recycled flue gas corresponding to the unit mass of base coal received is obtained based on the oxygen injection amount corresponding to the base coal received per unit mass, 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;

[0182] The amount of circulating flue gas before secondary air oxygen injection in the recycled 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 secondary air oxygen injection, the oxygen purity of the injected oxygen, 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;

[0183] The amount of circulating flue gas before dry air oxygen injection in the recycled flue gas corresponding to the unit mass of base coal received is obtained based on the oxygen injection amount corresponding to the base coal received per unit mass, the oxygen concentration after dry 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 dry air oxygen supply flow rate;

[0184] According to the circulating flue gas volume before primary air oxygen injection, the circulating flue gas volume before secondary air oxygen injection and the circulating flue gas volume before drying air oxygen injection in the recycled flue gas corresponding to the unit mass of base coal received, the recycled flue gas volume corresponding to the unit mass of base coal received is obtained.

[0185] For example, the recycled flue gas volume V2 corresponding to the unit mass of the base coal can be determined by, but not limited to, the following formula:

[0186]

[0187] The variables have the following meanings: oxygen injection amount corresponding to unit mass of base coal received Oxygen concentration after primary air injection Injected oxygen purity x, oxygen concentration detected at the flue gas recirculation extraction point Primary air oxygen flow Secondary air oxygen supply flow Dry air oxygen flow Oxygen concentration after secondary air injection Oxygen concentration after dry air oxygen injection

[0188] It should be noted that the determination of the amount of recycled flue gas corresponding to the unit mass of base coal received can be determined by those skilled in the art based on actual conditions. The above description is only an example and does not constitute a limitation to this.

[0189] For example, the amount of circulating flue gas before oxygen injection in the primary air of the recycled flue gas corresponding to the base coal received per unit mass is

[0190] For example, the amount of circulating flue gas before secondary air oxygen injection in the recycled flue gas corresponding to the base coal received per unit mass is

[0191] For example, the amount of circulating flue gas before oxygen injection in the drying air in the recycled flue gas corresponding to the base coal received per unit mass is

[0192] The amount of recycled flue gas corresponding to the unit mass of received base coal obtained through the above steps is also achieved based on the relevant physical and chemical properties, the gas flow characteristics of the oxygen-enriched combustion boiler and the structure of the oxygen-enriched combustion boiler. Therefore, the accuracy of the amount of recycled flue gas corresponding to the unit mass of received base coal can be improved, thereby improving the accuracy of the target equipment leakage determined in the subsequent steps, and achieving the minimum use of parameters that require measuring equipment to obtain, thereby reducing the number of required measuring equipment and further reducing costs.

[0193] In an optional embodiment, if Figure 5 As shown, the air leakage of the target equipment is obtained according to the received base coal parameters, the carbon dioxide concentration detected at the outlet of the target equipment, the carbon dioxide concentration detected at the outlet of the next adjacent equipment of the target equipment, the carbon dioxide concentration detected at the flue gas recirculation extraction point, the condensed water vapor amount, the exhaust amount and the recirculated flue gas amount, including the following steps:

[0194] S501: Obtaining a received base coal mass flow rate according to the received base coal parameters, and the power generation load, heating load, and unit coal consumption provided by the power plant SIS system.

[0195] S502: Based on the amount of condensed water vapor, exhaust gas, recycled flue gas volume, carbon dioxide concentration detected at the flue gas recirculation extraction point, and carbon dioxide concentration detected at the outlet of the target device, the amount of air leakage between the target device and the flue gas recirculation extraction point corresponding to the unit mass of base coal received is obtained.

[0196] S503: Based on the amount of condensed water vapor, exhaust gas, recycled flue gas volume, carbon dioxide concentration detected at the flue gas recirculation extraction point, and carbon dioxide concentration detected at the outlet of the next adjacent device of the target device, the amount of air leakage between the next adjacent device of the target device corresponding to the base coal received per unit mass and the flue gas recirculation extraction point is obtained.

[0197] S504: The air leakage volume of the target device is obtained based on the air leakage volume between the target device corresponding to the unit mass of the received base coal and the flue gas recirculation extraction point, the air leakage volume between the next adjacent device of the target device corresponding to the unit mass of the received base coal and the flue gas recirculation extraction point, and the mass flow rate of the received base coal.

[0198] Exemplarily, according to the received base coal parameters, the power generation load, heating load and unit coal consumption given by the power plant SIS system are obtained, and thus according to the power generation load, heating load and unit coal consumption given by the power plant SIS system, the received base coal mass flow rate is obtained. This is a conventional technical means in this field and will not be repeated here.

[0199] For example, the air leakage between the target equipment corresponding to the base coal received per unit mass and the flue gas recirculation extraction point is It can be determined by but not limited to the following formula:

[0200]

[0201] The variables have the following meanings: Condensed water vapor 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 outlet of the target device

[0202] For example, the air leakage between the next adjacent device of the target device corresponding to the base coal and the flue gas recirculation extraction point is It can be determined by but not limited to the following formula:

[0203]

[0204] The variables have the following meanings: Condensed water vapor Exhaust volume V3, recirculated flue gas volume V2, and carbon dioxide concentration detected at the flue gas recirculation extraction point The carbon dioxide concentration detected at the outlet of the next adjacent device of the target device

[0205] Exemplarily, the target equipment includes but is not limited to a furnace, a high-temperature superheater, a low-temperature superheater, an economizer, an air preheater or a dust collector in an oxy-fuel combustion boiler.

[0206] Exemplarily, the next adjacent device of the target device is the next adjacent device of the target device determined along the gas flow direction in the boiler. For example, if a target device is a furnace, and the gas in the boiler needs to flow from the furnace to the high-temperature superheater, then the adjacent device is the high-temperature superheater. For another example, if a target device is a low-temperature superheater, and the gas in the boiler needs to flow from the low-temperature superheater to the air preheater, then the adjacent device is the air preheater. It should be noted that the next adjacent device of the target device can be determined by those skilled in the art based on actual circumstances, and the above description is merely an example and does not constitute a limitation.

[0207] Determining the target equipment air leakage rate of an oxy-fuel combustion boiler through the above steps is achieved by closely integrating the structure of the oxy-fuel combustion boiler, the flow characteristics of the gas, and the relevant physical and chemical properties of the oxy-fuel combustion boiler. Therefore, while making the determination of the target equipment air leakage rate of the oxy-fuel combustion boiler feasible, the determined target equipment air leakage rate of the oxy-fuel combustion boiler is also highly accurate, overcoming the problem of the lack of a standard method for determining the target equipment air leakage rate of an oxy-fuel combustion boiler in the prior art. Furthermore, the above steps can minimize the number of parameters required to be collected during the determination process, thereby minimizing the amount and scale of equipment required to determine the target equipment air leakage rate of the oxy-fuel combustion boiler, thereby effectively reducing the cost of determining the target equipment air leakage rate of the oxy-fuel combustion boiler.

[0208] In an optional embodiment, the air leakage of the target device is obtained based on the air leakage between the target device corresponding to the unit mass of the received base coal and the flue gas recirculation extraction point, the air leakage between the next adjacent device of the target device corresponding to the unit mass of the received base coal and the flue gas recirculation extraction point, and the mass flow rate of the received base coal, including:

[0209] The air leakage volume between the target device corresponding to the base coal received per unit mass and the flue gas recirculation extraction point is subtracted from the air leakage volume between the next adjacent device of the target device corresponding to the base coal received per unit mass and the flue gas recirculation extraction point to obtain the air leakage volume of the target device corresponding to the base coal received per unit mass;

[0210] The target equipment air leakage corresponding to the unit mass of the received base coal is multiplied by the mass flow rate of the received base coal to obtain the target equipment air leakage.

[0211] For example, the target equipment air leakage volume ΔV i.final , which can be expressed as the following formula:

[0212]

[0213] The meanings of the variables are as follows: received base coal mass flow rate coal, air leakage between the target equipment and the flue gas recirculation extraction point corresponding to the unit mass of received base coal The air leakage between the next adjacent equipment of the target equipment corresponding to the base coal received per unit mass and the flue gas recirculation extraction point

[0214] Determining the target equipment air leakage rate of the oxy-fuel combustion boiler through the above steps is further achieved by closely combining the structure of the oxy-fuel combustion boiler, the flow characteristics of the gas, and the relevant physical and chemical properties of the oxy-fuel combustion boiler. Therefore, the accuracy of the determined target equipment air leakage rate of the oxy-fuel combustion boiler can be further improved.

[0215] Based on the same principle, the embodiment of the present invention discloses a device 600 for determining the air leakage of an oxygen-enriched combustion boiler. Figure 6 As shown, the device 600 for determining the air leakage rate of an oxy-fuel combustion boiler includes:

[0216] The smoke emission determination module 601 is used to obtain the smoke emission per unit mass of the received base coal according to the received base coal parameters and the carbon dioxide concentration detected at the flue gas recirculation extraction point.

[0217] The condensed water vapor amount determination module 602 is used to obtain the total air leakage of the boiler and the oxygen injection amount corresponding to the unit mass of the 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, the atmospheric parameters and the injected oxygen purity, and then obtain the condensed water vapor amount corresponding to the unit mass of the received base coal based on the total air leakage of the boiler, the smoke exhaust volume, the water vapor concentration detected at the flue gas recirculation extraction point, the received base coal parameters and the atmospheric parameters.

[0218] The recycled flue gas volume determination module 603 is used to obtain the recycled flue gas volume corresponding to the unit mass of the base coal received based on the oxygen injection volume corresponding to the unit mass of the base coal received, the primary air oxygen injection parameters, the secondary air oxygen injection parameters, the dry air oxygen injection parameters, the injected oxygen purity and the oxygen concentration detected at the flue gas recirculation extraction point.

[0219] The target equipment air leakage determination module 604 is used to obtain the target equipment air leakage based on the received base coal parameters, the carbon dioxide concentration detected at the target equipment outlet, the carbon dioxide concentration detected at the outlet of the next adjacent equipment of the target equipment, the carbon dioxide concentration detected at the flue gas recirculation extraction point, the condensed water vapor amount, the exhaust amount and the recirculated flue gas amount.

[0220] In an optional embodiment, the smoke exhaust volume determination module 601 is configured to:

[0221] Obtaining a carbon element quality index of the received base coal according to the received base coal parameters;

[0222] The smoke emission per unit mass of the received base coal is obtained according to the carbon element quality index of the received base coal and the carbon dioxide concentration detected at the flue gas recirculation extraction point.

[0223] In an optional embodiment, the condensed water vapor amount determining module 602 is configured to:

[0224] According to the received base coal parameters, a carbon element quality index, a hydrogen element quality index, an oxygen element quality index, a nitrogen element quality index, a sulfur element quality index and a moisture quality index of the received base coal are obtained;

[0225] Obtaining the absolute humidity of the atmosphere according to the atmospheric parameters;

[0226] Obtain the total air leakage of the boiler corresponding to a unit mass of the received base coal based on the carbon element quality index, hydrogen element quality index, oxygen element quality index, nitrogen element quality index, sulfur element quality index, moisture quality index, atmospheric absolute humidity, oxygen injection 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 of the received base coal;

[0227] According to 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 air leakage of the boiler, the oxygen injection amount corresponding to the unit mass of the base coal received is obtained.

[0228] In an optional embodiment, the condensed water vapor amount determining module 602 is configured to:

[0229] According to the received base coal parameters, a hydrogen element quality index and a moisture quality index of the received base coal are obtained;

[0230] Obtaining the absolute humidity of the atmosphere according to the atmospheric parameters;

[0231] The amount of condensed water vapor per unit mass of base coal is obtained based on the hydrogen quality index, moisture quality index, absolute atmospheric humidity, total air leakage of the boiler, exhaust volume and water vapor concentration detected at the flue gas recirculation extraction point.

[0232] In an optional embodiment, the recirculated flue gas amount determination module 603 is configured to:

[0233] According to the primary air oxygen injection parameters, the oxygen concentration and the primary air oxygen supply flow rate after the primary air oxygen injection are obtained;

[0234] According to the secondary air oxygen injection parameters, the oxygen concentration and the secondary air oxygen supply flow rate after the secondary air oxygen injection are obtained;

[0235] According to the dry air oxygen injection parameters, the oxygen concentration and dry air oxygen supply flow rate after the dry air oxygen injection are obtained;

[0236] The amount of recycled flue gas corresponding to the unit mass of base coal received is obtained based on the oxygen concentration after the primary air oxygen injection, the primary air oxygen supply flow rate, the oxygen concentration after the secondary air oxygen injection, the secondary air oxygen supply flow rate, the oxygen concentration after the dry air oxygen injection, the dry air oxygen supply flow rate, the oxygen injection amount corresponding to the unit mass of base coal received, the oxygen injection purity and the oxygen concentration obtained by detection at the flue gas recirculation extraction point.

[0237] In an optional embodiment, the condensed water vapor amount determining module 602 is configured to:

[0238] Obtaining the flue gas volume per unit mass of the base coal after complete combustion according to the carbon quality index, hydrogen quality index, nitrogen quality index, sulfur quality index, and moisture quality index;

[0239] According to the carbon element quality index, hydrogen element quality index, sulfur element quality index and oxygen element quality index, the theoretical amount of oxygen required for complete combustion of a unit mass of the received base coal is obtained;

[0240] Based on the amount of flue gas produced by complete combustion of the unit mass of the received base coal, the theoretical amount of oxygen required for complete combustion of the unit mass of the received base coal, the carbon element quality index, the hydrogen element quality index, the moisture quality index, the purity of injected oxygen, 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 air leakage of the boiler corresponding to the unit mass of the received base coal is obtained.

[0241] In an optional embodiment, the condensed water vapor amount determining module 602 is configured to:

[0242] The amount of nitrogen in the total air leakage of the boiler corresponding to the unit mass of the received base coal is obtained based on the flue gas volume resulting from complete combustion of the unit mass of the received base coal, the theoretical amount of oxygen required for complete combustion of the unit mass of the received base coal, the carbon element quality index, the hydrogen element quality index, the water quality index, the purity of the injected oxygen, 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;

[0243] According to the injected oxygen purity and the absolute humidity of the atmosphere, the ratio of the amount of nitrogen in the total leakage air of the boiler corresponding to the unit mass of the base coal received is obtained;

[0244] According to the nitrogen amount and the ratio of the nitrogen amount, the total air leakage of the boiler corresponding to the unit mass of the base coal received is obtained.

[0245] In an optional embodiment, the condensed water vapor amount determining module 602 is configured to:

[0246] Obtaining the chimney exhaust oxygen content corresponding to the unit mass of the received base coal 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;

[0247] According to the absolute humidity of the atmosphere and the total air leakage of the boiler, the amount of additional oxygen brought by the air leakage corresponding to the unit mass of the base coal received is obtained;

[0248] According to the carbon element quality index, hydrogen element quality index, sulfur element quality index and oxygen element quality index, the theoretical amount of oxygen required for complete combustion of a unit mass of the received base coal is obtained;

[0249] The oxygen injection amount corresponding to the unit mass of base coal received is obtained based on the oxygen content of the chimney exhaust gas, the additional oxygen amount brought by air leakage, the theoretical oxygen amount required for complete combustion and the purity of the injected oxygen.

[0250] In an optional embodiment, the condensed water vapor amount determining module 602 is configured to:

[0251] According to the hydrogen element quality index and the water quality index, the amount of water vapor generated by the combustion of the unit mass of the received base coal is obtained;

[0252] According to the absolute humidity of the atmosphere and the total air leakage of the boiler, the amount of water vapor in the air leakage corresponding to the unit mass of the base coal received is obtained;

[0253] Obtaining the amount of water vapor in the flue gas of the boiler corresponding to the unit mass of the base coal received based on the flue gas volume and the water vapor concentration detected at the flue gas recirculation extraction point;

[0254] The amount of condensed water vapor corresponding to the unit mass of the received base coal is obtained based on the amount of water vapor generated by the combustion of the unit mass of the received base coal, the amount of water vapor in the leakage air corresponding to the unit mass of the received base coal, and the amount of water vapor in the flue gas of the boiler exhaust corresponding to the unit mass of the received base coal.

[0255] In an optional embodiment, the recirculated flue gas amount determination module 603 is configured to:

[0256] The amount of circulating flue gas before primary air oxygen injection in the recycled flue gas corresponding to the unit mass of base coal received is obtained based on the oxygen injection amount corresponding to the base coal received per unit mass, 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;

[0257] The amount of circulating flue gas before secondary air oxygen injection in the recycled 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 secondary air oxygen injection, the oxygen purity of the injected oxygen, 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;

[0258] The amount of circulating flue gas before dry air oxygen injection in the recycled flue gas corresponding to the unit mass of base coal received is obtained based on the oxygen injection amount corresponding to the base coal received per unit mass, the oxygen concentration after dry 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 dry air oxygen supply flow rate;

[0259] According to the circulating flue gas volume before primary air oxygen injection, the circulating flue gas volume before secondary air oxygen injection and the circulating flue gas volume before drying air oxygen injection in the recycled flue gas corresponding to the unit mass of base coal received, the recycled flue gas volume corresponding to the unit mass of base coal received is obtained.

[0260] In an optional embodiment, the target equipment air leakage determination module 604 is configured to:

[0261] According to the received base coal parameters, the power generation load, heating load and unit coal consumption provided by the power plant SIS system are obtained, thereby obtaining the received base coal mass flow rate according to the power generation load, heating load and unit coal consumption provided by the power plant SIS system;

[0262] The air leakage volume between the target equipment and the flue gas recirculation extraction point corresponding to the unit mass of base coal received is obtained based on the condensed water vapor volume, the exhaust volume, the recirculated flue gas volume, the carbon dioxide concentration detected at the flue gas recirculation extraction point, and the carbon dioxide concentration detected at the outlet of the target equipment;

[0263] The air leakage volume between the next adjacent device of the target device and the flue gas recirculation extraction point is obtained based on the condensed water vapor volume, the exhaust smoke volume, the recirculated flue gas volume, the carbon dioxide concentration detected at the flue gas recirculation extraction point, and the carbon dioxide concentration detected at the outlet of the next adjacent device of the target device;

[0264] The air leakage of the target equipment is obtained based on the air leakage between the target equipment corresponding to the unit mass of the received base coal and the flue gas recirculation extraction point, the air leakage between the next adjacent equipment of the target equipment corresponding to the unit mass of the received base coal and the flue gas recirculation extraction point, and the mass flow rate of the received base coal.

[0265] In an optional embodiment, the target equipment air leakage determination module 604 is configured to:

[0266] The air leakage volume between the target device corresponding to the base coal received per unit mass and the flue gas recirculation extraction point is subtracted from the air leakage volume between the next adjacent device of the target device corresponding to the base coal received per unit mass and the flue gas recirculation extraction point to obtain the air leakage volume of the target device corresponding to the base coal received per unit mass;

[0267] The target equipment air leakage corresponding to the unit mass of the received base coal is multiplied by the mass flow rate of the received base coal to obtain the target equipment air leakage.

[0268] Since the principle of solving the problem by the device 600 for determining the air leakage rate of an oxygen-enriched combustion boiler is similar to that of the above method, the implementation of the device 600 for determining the air leakage rate of an oxygen-enriched combustion boiler can refer to the implementation of the above method and will not be described in detail here.

[0269] The systems, devices, modules, or units described in the above embodiments may be implemented by computer chips or entities, or by products having certain functions. A typical implementation device is a computer device. Specifically, the computer device may 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 a combination of any of these devices.

[0270] 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. When the processor executes the program, the method described above is implemented.

[0271] Reference below Figure 7 , which shows a schematic structural diagram of a computer device 700 suitable for implementing an embodiment of the present application.

[0272] like Figure 7 As shown, computer device 700 includes a central processing unit (CPU) 701, which can perform various appropriate tasks and processes according to a program stored in a read-only memory (ROM) 702 or a program loaded from a storage portion 708 into a random access memory (RAM) 703. Various programs and data required for the operation of system 700 are also stored in RAM 703. CPU 701, ROM 702, and RAM 703 are connected to each other via a bus 704. An input / output (I / O) interface 705 is also connected to bus 704.

[0273] The following components are connected to the I / O interface 705: an input section 706 including a keyboard, a mouse, and the like; an output section 707 including devices such as a cathode ray tube (CRT), a liquid crystal display (LCD), and a speaker; a storage section 708 including devices such as a hard disk; and a communication section 709 including a network interface card such as a LAN card or a modem. 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. Removable media 711, such as a magnetic disk, an optical disk, a magneto-optical disk, or a semiconductor memory, is installed in the drive 710 as needed, so that computer programs read therefrom can be installed in the storage section 708 as needed.

[0274] 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 executing the methods illustrated 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 media 711.

[0275] Computer-readable media includes permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. The information can be computer-readable instructions, data structures, program modules 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 technology, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable media does not include transitory computer-readable media (transitory media), such as modulated data signals and carrier waves.

[0276] For the convenience of description, the above devices are described as being divided into various units according to their functions. Of course, when implementing this application, the functions of each unit can be implemented in the same or multiple software and / or hardware.

[0277] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts 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, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0278] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0279] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0280] It should also be noted that the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, commodity, or apparatus that includes a series of elements includes not only those elements but also other elements not explicitly listed, or includes elements inherent to such process, method, commodity, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises a ..." does not exclude the presence of other identical elements in the process, method, commodity, or apparatus that includes the element.

[0281] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present application may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0282] The present application may be described in the general context of computer-executable instructions executed by a computer, such as program modules. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform specific tasks or implement specific abstract data types. The present application may also be practiced in distributed computing environments where tasks are performed by remote processing devices connected through a communications network. In a distributed computing environment, program modules may be located in local and remote computer storage media, including storage devices.

[0283] The various embodiments in this specification are described in a progressive manner. Similar parts between the various embodiments can be referred to in conjunction with each other. Each embodiment focuses on the differences between the other embodiments. In particular, the system embodiments are generally similar to the method embodiments, so the description is relatively simple. For relevant parts, refer to the description of the method embodiments.

[0284] The foregoing is merely an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should all be included within the scope of the claims of the present application.

Claims

1. A method for determining the air leakage of an oxygen-enriched combustion boiler, characterized in that: include: The smoke emission per unit mass of the received base coal is obtained according to the received base coal parameters and the carbon dioxide concentration detected at the flue gas recirculation extraction point; Obtaining the total air leakage of the boiler and the amount of oxygen injected per unit mass of the received base coal according to 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, the atmospheric parameters, and the injected oxygen purity; and further obtaining the amount of condensed water vapor corresponding to the unit mass of the received base coal according to the total air leakage of the boiler and the exhaust volume, the water vapor concentration detected at the flue gas recirculation extraction point, the received base coal parameters, and the atmospheric parameters; The amount of recycled 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 primary air oxygen injection parameters, the secondary air oxygen injection parameters, the drying air oxygen injection parameters, the oxygen injection purity, and the oxygen concentration detected at the flue gas recirculation extraction point; Obtaining the air leakage of the target equipment based on the received base coal parameters, the carbon dioxide concentration detected at the outlet of the target equipment, the carbon dioxide concentration detected at the outlet of the next adjacent equipment to the target equipment, the carbon dioxide concentration detected at the flue gas recirculation extraction point, the amount of condensed water vapor, the exhaust volume, and the amount of recirculated flue gas; The air leakage of the target equipment is obtained according to the received base coal parameters, the carbon dioxide concentration detected at the outlet of the target equipment, the carbon dioxide concentration detected at the outlet of the next adjacent equipment of the target equipment, the carbon dioxide concentration detected at the flue gas recirculation extraction point, the amount of condensed water vapor, the exhaust volume, and the amount of recirculated flue gas, including: According to the received base coal parameters, the power generation load, heating load and unit coal consumption provided by the power plant SIS system are obtained, thereby obtaining the received base coal mass flow rate according to the power generation load, heating load and unit coal consumption provided by the power plant SIS system; The air leakage volume between the target equipment and the flue gas recirculation extraction point corresponding to the unit mass of base coal received is obtained based on the condensed water vapor volume, the exhaust volume, the recirculated flue gas volume, the carbon dioxide concentration detected at the flue gas recirculation extraction point, and the carbon dioxide concentration detected at the outlet of the target equipment; The air leakage volume between the next adjacent device of the target device and the flue gas recirculation extraction point is obtained based on the condensed water vapor volume, the exhaust smoke volume, the recirculated flue gas volume, the carbon dioxide concentration detected at the flue gas recirculation extraction point, and the carbon dioxide concentration detected at the outlet of the next adjacent device of the target device; Obtain the target equipment air leakage rate based on the air leakage rate between the target equipment corresponding to the unit mass of the base coal received and the flue gas recirculation extraction point, the air leakage rate between the next adjacent equipment of the target equipment corresponding to the unit mass of the base coal received and the flue gas recirculation extraction point, and the mass flow rate of the received base coal; The air leakage of the target device is obtained based on the air leakage between the target device corresponding to the unit mass of the received base coal and the flue gas recirculation extraction point, the air leakage between the next adjacent device of the target device corresponding to the unit mass of the received base coal and the flue gas recirculation extraction point, and the mass flow rate of the received base coal, including: The air leakage volume between the target device corresponding to the base coal received per unit mass and the flue gas recirculation extraction point is subtracted from the air leakage volume between the next adjacent device of the target device corresponding to the base coal received per unit mass and the flue gas recirculation extraction point to obtain the air leakage volume of the target device corresponding to the base coal received per unit mass; The target equipment air leakage corresponding to the unit mass of the received base coal is multiplied by the mass flow rate of the received base coal to obtain the target equipment air leakage.

2. The method according to claim 1, characterized in that The smoke emission per unit mass of the received base coal is obtained according to the received base coal parameters and the carbon dioxide concentration detected at the flue gas recirculation extraction point, including: Obtaining a carbon element quality index of the received base coal according to the received base coal parameters; The smoke emission per unit mass of the received base coal is obtained according to 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 total air leakage of the boiler and the oxygen injection amount corresponding to the unit mass of the received base coal are obtained according to 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, the atmospheric parameters and the injected oxygen purity, including: According to the received base coal parameters, a carbon element quality index, a hydrogen element quality index, an oxygen element quality index, a nitrogen element quality index, a sulfur element quality index and a moisture quality index of the received base coal are obtained; Obtaining the absolute humidity of the atmosphere according to the atmospheric parameters; Obtain the total air leakage of the boiler corresponding to a unit mass of the received base coal based on the carbon element quality index, hydrogen element quality index, oxygen element quality index, nitrogen element quality index, sulfur element quality index, moisture quality index, atmospheric absolute humidity, oxygen injection 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 of the received base coal; According to 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 air leakage of the boiler, the oxygen injection amount corresponding to the unit mass of the base coal received is obtained.

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

5. The method according to claim 1, characterized in that The amount of recycled flue gas corresponding to the unit mass of base coal received is obtained according to the oxygen injection amount corresponding to the unit mass of base coal received, the primary air oxygen injection parameters, the secondary air oxygen injection parameters, the drying air oxygen injection parameters, the oxygen injection purity and the oxygen concentration detected at the flue gas recirculation extraction point, including: According to the primary air oxygen injection parameters, the oxygen concentration and the primary air oxygen supply flow rate after the primary air oxygen injection are obtained; According to the secondary air oxygen injection parameters, the oxygen concentration and the secondary air oxygen supply flow rate after the secondary air oxygen injection are obtained; According to the dry air oxygen injection parameters, the oxygen concentration and dry air oxygen supply flow rate after the dry air oxygen injection are obtained; The amount of recycled flue gas corresponding to the unit mass of base coal received is obtained based on the oxygen concentration after the primary air oxygen injection, the primary air oxygen supply flow rate, the oxygen concentration after the secondary air oxygen injection, the secondary air oxygen supply flow rate, the oxygen concentration after the dry air oxygen injection, the dry air oxygen supply flow rate, the oxygen injection amount corresponding to the unit mass of base coal received, the oxygen injection purity and the oxygen concentration obtained by detection at the flue gas recirculation extraction point.

6. The method according to claim 3, characterized in that The total air leakage of the boiler corresponding to the unit mass of the received base coal is obtained based on the carbon element quality index, hydrogen element quality index, oxygen element quality index, nitrogen element quality index, sulfur element quality index, moisture quality index, atmospheric absolute humidity, oxygen injection 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 of the received base coal, including: Obtaining the flue gas volume per unit mass of the base coal after complete combustion according to the carbon quality index, hydrogen quality index, nitrogen quality index, sulfur quality index, and moisture quality index; According to the carbon element quality index, hydrogen element quality index, sulfur element quality index and oxygen element quality index, the theoretical amount of oxygen required for complete combustion of a unit mass of the received base coal is obtained; Based on the amount of flue gas produced by complete combustion of the unit mass of the received base coal, the theoretical amount of oxygen required for complete combustion of the unit mass of the received base coal, the carbon element quality index, the hydrogen element quality index, the moisture quality index, the purity of injected oxygen, 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 air leakage of the boiler corresponding to the unit mass of the received base coal is obtained.

7. The method according to claim 6, characterized in that The total air leakage of the boiler corresponding to the unit mass of the received base coal is obtained based on the flue gas volume of the completely burned unit mass of the received base coal, the theoretical amount of oxygen required for the complete combustion of the unit mass of the received base coal, the carbon element quality index, the hydrogen element quality index, the water quality index, the injected oxygen 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, including: The amount of nitrogen in the total air leakage of the boiler corresponding to the unit mass of the received base coal is obtained based on the flue gas volume resulting from complete combustion of the unit mass of the received base coal, the theoretical amount of oxygen required for complete combustion of the unit mass of the received base coal, the carbon element quality index, the hydrogen element quality index, the water quality index, the purity of the injected oxygen, 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; According to the injected oxygen purity and the absolute humidity of the atmosphere, the ratio of the amount of nitrogen in the total leakage air of the boiler corresponding to the unit mass of the base coal received is obtained; According to the nitrogen amount and the ratio of the nitrogen amount, the total air leakage of the boiler corresponding to the unit mass of the base coal received is obtained.

8. The method according to claim 3, characterized in that The oxygen injection amount corresponding to the unit mass of base coal received 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 air leakage of the boiler, including: Obtaining the chimney exhaust oxygen content corresponding to the unit mass of the received base coal 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; According to the absolute humidity of the atmosphere and the total air leakage of the boiler, the amount of additional oxygen brought by the air leakage corresponding to the unit mass of the base coal received is obtained; According to the carbon element quality index, hydrogen element quality index, sulfur element quality index and oxygen element quality index, the theoretical amount of oxygen required for complete combustion of a unit mass of the received base coal is obtained; The oxygen injection amount corresponding to the unit mass of base coal received is obtained based on the oxygen content of the chimney exhaust gas, the additional oxygen amount brought by air leakage, the theoretical oxygen amount required for complete combustion and the purity of the injected oxygen.

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

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

11. A device for determining air leakage of an oxygen-enriched combustion boiler, characterized in that: include: The smoke emission determination module is used to obtain the smoke emission per unit mass of the received base coal according to the received base coal parameters and the carbon dioxide concentration detected at the flue gas recirculation extraction point; a condensed water vapor amount determination module, configured to determine the total boiler air leakage and oxygen injection amount 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 the injected oxygen purity; and further determine the condensed water vapor amount corresponding to a unit mass of received base coal based on the total boiler air leakage, smoke exhaust, the water vapor concentration detected at the flue gas recirculation extraction point, the received base coal parameters, and the atmospheric parameters; a recirculated flue gas volume determination module, configured to determine the recirculated flue gas volume corresponding to the base coal received per unit mass based on the oxygen injection volume corresponding to the base coal received per unit mass, the primary air oxygen injection parameters, the secondary air oxygen injection parameters, the drying air oxygen injection parameters, the oxygen injection purity, and the oxygen concentration detected at the flue gas recirculation extraction point; a target equipment air leakage determination module, configured to determine the target equipment air leakage based on the received base coal parameters, the carbon dioxide concentration detected at the target equipment outlet, the carbon dioxide concentration detected at the outlet of the next adjacent equipment to the target equipment, the carbon dioxide concentration detected at the flue gas recirculation extraction point, the amount of condensed water vapor, the exhaust volume, and the amount of recirculated flue gas; The target equipment air leakage determination module is configured to obtain the power generation load, heating load, and unit coal consumption provided by the power plant SIS system based on the received base coal parameters, thereby obtaining the received base coal mass flow rate based on the power generation load, heating load, and unit coal consumption provided by the power plant SIS system; The air leakage volume between the target device corresponding to the base coal received per unit mass and the flue gas recirculation extraction point is obtained based on the amount of condensed water vapor, the amount of exhaust smoke, 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 outlet of the target device; the air leakage volume between the target device corresponding to the base coal received per unit mass and the flue gas recirculation extraction point is obtained based on the amount of condensed water vapor, the amount of exhaust smoke, 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 outlet of the next adjacent device of the target device; Obtain the target equipment air leakage rate based on the air leakage rate between the target equipment corresponding to the unit mass of the base coal received and the flue gas recirculation extraction point, the air leakage rate between the next adjacent equipment of the target equipment corresponding to the unit mass of the base coal received and the flue gas recirculation extraction point, and the mass flow rate of the received base coal; The target equipment air leakage determination module is used to subtract the air leakage between the target equipment corresponding to the unit mass of the received base coal and the flue gas recirculation extraction point from the air leakage between the target equipment corresponding to the unit mass of the received base coal and the flue gas recirculation extraction point to obtain the air leakage of the target equipment corresponding to the unit mass of the received base coal; and multiply the air leakage of the target equipment corresponding to the unit mass of the received base coal by the mass flow rate of the received base coal to obtain the air leakage of the target equipment.

12. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, the method according to any one of claims 1 to 10 is implemented.

13. A computer-readable medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method according to any one of claims 1 to 10 is implemented.

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