Method and device for analyzing energy consumption of condensed water air heater system

Abstract

The invention provides an energy consumption analysis method and device for a condensed water air heater system. The method comprises the steps that under the operation condition of the condensed water air heater system, coal consumption analysis parameters under the outage condition and the operation condition are obtained at the same time; based on the booster pump power, the second station service power consumption rate and the generator output power, the first station service power consumption rate of the condensation water air heater system under the outage working condition is obtained; based on the first boiler fuel efficiency, the first steam turbine heat consumption rate and the first station service power consumption rate, first unit power supply coal consumption under the outage working condition is obtained; based on the second boiler fuel efficiency, the second steam turbine heat consumption rate and the second station service power consumption rate, second unit power supply coal consumption under the commissioning working condition is obtained; and obtaining the energy consumption of the condensed water air heater system based on the power supply coal consumption of the first unit and the power supply coal consumption of the second unit. Compared with a conventional energy consumption analysis and calculation method, the energy consumption analysis and calculation method has the advantages that the workload is small, and the test precision is higher.

Description

Technical Field

[0001] The present invention relates to the technical field of energy consumption analysis in thermal power generation, and particularly to a method and device for analyzing the energy consumption of a condensing water heater system. Background Art

[0002] The air preheater can improve the heat exchange performance of the boiler and reduce energy consumption. However, due to the presence of sulfur trioxide in the flue gas generated by fuel combustion, the metal of the heat transfer surface of the air preheater is prone to low-temperature corrosion, resulting in the rupture of the metal of the heat transfer surface of the air preheater. A large amount of air leaks into the flue gas, deteriorating the air supply for combustion, reducing the boiler efficiency, affecting the heat transfer efficiency of the air preheater, and at the same time, the corrosion will also aggravate the ash accumulation, increasing the resistance of the flue gas duct, and affecting the safe and economic operation of the boiler.

[0003] To prevent the low-temperature corrosion of the air preheater, it is necessary to ensure the inlet air temperature of the air preheater. Therefore, setting a heater on the cold air pipeline is a common solution. The conventional heater is a steam heater, and the steam source is generally steam with a pressure of 0.3 - 0.5 MPa. This steam generally comes from the extraction steam corresponding to the third or fourth low-pressure heater downstream of the shaft seal heater. The quality of this part of the heater extraction steam is relatively high, reducing the economy of the coal-fired unit.

[0004] To reduce energy consumption, a condensing water heater system using low-quality extraction steam has emerged. The condensing water heater system uses low-quality extraction steam to heat the condensate, and then uses the condensate to heat the primary and secondary cold air. The booster pump extracts the condensate from the outlet of the low-pressure heater, boosts the pressure, and sends it to the condensing water heater. After the condensate releases heat in the heater, it returns to the inlet of the low-pressure heater. By increasing the extraction steam volume of the low-quality steam, it is ensured that the condensate temperature at the outlet of the low-pressure heater does not decrease due to heating the primary and secondary cold air.

[0005] The conventional calculation method for analyzing the energy consumption of the condensing water heater system generally conducts boiler fuel efficiency tests and steam turbine heat rate tests under two conditions: when the condensing water heater system is out of service and when it is in service. Then, the power supply coal consumption of the coal-fired unit under the two conditions is calculated respectively. The difference between the power supply coal consumption of the coal-fired unit under the two conditions is used as the energy consumption of the condensing water heater system. However, the workload of the comprehensive and accurate boiler fuel efficiency test and steam turbine heat rate test is relatively large. At the same time, the energy consumption of the condensing water heater system is also greatly affected by operating parameters and the unit thermal system. There are many influencing factors, and the reproducibility of the test results is poor, which will have a greater impact on the accurate evaluation of the energy consumption. Summary of the Invention

[0006] In view of this, the present invention provides a method and device for analyzing the energy consumption of a condensing water heater system to solve at least one of the above-mentioned problems.

[0007] To achieve the above object, the present invention adopts the following solutions:

[0008] According to the first aspect of the present invention, there is provided a method for analyzing the energy consumption of a condensing water heating air heater system. The method includes: obtaining the coal consumption analysis parameters under both the shutdown condition and the operation condition when the condensing water heating air heater system is in the operation condition. The coal consumption analysis parameters under the shutdown condition include the first boiler fuel efficiency corrected by the inlet air temperature and the first steam turbine heat consumption rate corrected by the parameters. The coal consumption analysis parameters under the operation condition include the booster pump power, the second boiler fuel efficiency corrected by the inlet air temperature, the second steam turbine heat consumption rate corrected by the parameters, the second plant power consumption rate, and the generator output power; obtaining the first plant power consumption rate under the shutdown condition of the condensing water heating air heater system based on the booster pump power, the second plant power consumption rate, and the generator output power; obtaining the first unit power supply coal consumption under the shutdown condition of the condensing water heating air heater system based on the first boiler fuel efficiency, the first steam turbine heat consumption rate, and the first plant power consumption rate; obtaining the second unit power supply coal consumption under the operation condition of the condensing water heating air heater system based on the second boiler fuel efficiency, the second steam turbine heat consumption rate, and the second plant power consumption rate; and obtaining the energy consumption of the condensing water heating air heater system based on the first unit power supply coal consumption and the second unit power supply coal consumption.

[0009] As an embodiment of the present invention, obtaining the first boiler fuel efficiency corrected by the inlet air temperature under the shutdown condition when the condensing water heating air heater system is in the operation condition in the above method includes: based on the test parameters under the operation condition of the condensing water heating air heater system, using the following formula to obtain the first boiler fuel efficiency corrected by the inlet air temperature under the shutdown condition:

[0010]

[0011] wherein, is the first boiler fuel efficiency corrected by the inlet air temperature under the shutdown condition of the condensing water heating air heater system; is the heat loss of the flue gas discharged corrected by the inlet air temperature under the shutdown condition of the condensing water heating air heater system; q3 is the heat loss due to incomplete combustion of the gas; q4 is the heat loss due to incomplete combustion of the solid; q5 is the heat loss due to heat dissipation; is the sensible heat loss of the ash and slag corrected by the inlet air temperature under the shutdown condition of the condensing water heating air heater system; q 0th is other losses; is the percentage of the external heat to the low calorific value of the fuel corrected by the inlet air temperature under the shutdown condition of the condensing water heating air heater system.

[0012] As an embodiment of the present invention, obtaining the first steam turbine heat consumption rate corrected by the parameters under the shutdown condition when the condensing water heating air heater system is in the operation condition in the above method includes: based on the test parameters under the operation condition of the condensing water heating air heater system, using the following formula to obtain the first steam turbine heat consumption rate corrected by the parameters under the shutdown condition:

[0013]

[0014]

[0015] Among them, H' is the turbine heat rate under the shutdown condition of the condensing water heater system; is the first turbine heat rate after parameter correction under the shutdown condition of the condensing water heater system; C is the correction coefficient of the turbine heat rate; q m1 is the superheated steam flow rate; h1 is the enthalpy of superheated steam; q m3 is the hot reheat steam flow rate; h3 is the enthalpy of hot reheat steam; q m11 is the boiler feed water flow rate; h 11 is the enthalpy of boiler feed water; q m2 is the high-pressure extraction steam flow rate; h2 is the enthalpy of high-pressure extraction steam; q mis is the attemperating water flow rate for superheated steam; h is is the enthalpy of attemperating water for superheated steam; q mir is the attemperating water flow rate for reheated steam; h ir is the enthalpy of attemperating water for reheated steam; q m4 is the condensate flow rate in the condensing water heater; h4 is the enthalpy of condensate flowing from the outlet of the low-pressure heater to the condensing water heater; h5 is the enthalpy of condensate returning from the condensing water heater to the inlet of the low-pressure heater; P is the generator output power under the operating condition of the condensing water heater system.

[0016] As an embodiment of the present invention, obtaining the second boiler fuel efficiency after inlet air temperature correction under the operating condition of the condensing water heater system in the above method includes: based on the test parameters under the operating condition of the condensing water heater system, using the following formula to obtain the second boiler fuel efficiency after inlet air temperature correction under the operating condition:

[0017]

[0018] Among them, is the second boiler fuel efficiency after inlet air temperature correction under the operating condition of the condensing water heater system; is the heat loss of flue gas after inlet air temperature correction under the operating condition of the condensing water heater system; q3 is the heat loss due to incomplete combustion of gas; q4 is the heat loss due to incomplete combustion of solid; q5 is the heat loss due to heat dissipation; is the sensible heat loss of ash and slag after inlet air temperature correction under the operating condition of the condensing water heater system; q 0th is other losses; is the percentage of the external heat to the lower calorific value of fuel after inlet air temperature correction under the operating condition of the condensing water heater system.

[0019] As an embodiment of the present invention, obtaining the second steam turbine heat rate after parameter correction under the operating condition of the condensing water heater system in the above method includes: based on the test parameters under the operating condition of the condensing water heater system, using the following formula to obtain the second steam turbine heat rate after parameter correction under the operating condition:

[0020]

[0021] Wherein, H” is the steam turbine heat rate under the operating condition of the condensing water heater system; is the second steam turbine heat rate after parameter correction under the operating condition of the condensing water heater system; C is the correction coefficient of the steam turbine heat rate; q m1 is the superheated steam flow rate; h1 is the superheated steam enthalpy; q m3 is the hot reheat steam flow rate; h3 is the hot reheat steam enthalpy; q m11 is the boiler feed water flow rate; h 11 is the boiler feed water enthalpy; q m2 is the high-pressure extraction steam flow rate; h2 is the high-pressure extraction steam enthalpy; q mis is the attemperating water flow rate for superheated steam; h is is the attemperating water enthalpy for superheated steam; q mir is the attemperating water flow rate for reheated steam; h ir is the attemperating water enthalpy for reheated steam; P is the generator output power under the operating condition of the condensing water heater system.

[0022] As an embodiment of the present invention, obtaining the first auxiliary power consumption rate under the shutdown condition of the condensing water heater system based on the booster pump power, the second auxiliary power consumption rate, and the generator output power in the above method includes: based on the booster pump power, the second auxiliary power consumption rate, and the generator output power, using the following formula to obtain the first auxiliary power consumption rate under the shutdown condition of the condensing water heater system:

[0023]

[0024] Wherein, L' is the first auxiliary power consumption rate under the shutdown condition of the condensing water heater system; L” is the second auxiliary power consumption rate; P b is the booster pump power; P is the generator output power.

[0025] As an embodiment of the present invention, obtaining the first unit power supply coal consumption under the shutdown condition of the condensing water heater system based on the first boiler fuel efficiency, the first steam turbine heat rate, and the first auxiliary power consumption rate in the above method includes: based on the first boiler fuel efficiency, the first steam turbine heat rate, and the first auxiliary power consumption rate, using the following formula to obtain the first unit power supply coal consumption under the shutdown condition of the condensing water heater system:

[0026]

[0027] wherein, b' is the power supply coal consumption of the first unit under the shutdown condition of the condensing water heating air heater system; is the heat consumption rate of the first steam turbine; is the fuel efficiency of the first boiler; η p is the system pipeline efficiency; L' is the first plant electricity consumption rate.

[0028] As an embodiment of the present invention, obtaining the power supply coal consumption of the second unit under the operation condition of the condensing water heating air heater system based on the second boiler fuel efficiency, the second steam turbine heat consumption rate, and the second plant electricity consumption rate in the above method includes: based on the second boiler fuel efficiency, the second steam turbine heat consumption rate, and the second plant electricity consumption rate, using the following formula to obtain the power supply coal consumption of the second unit under the operation condition of the condensing water heating air heater system:

[0029]

[0030] wherein, b” is the power supply coal consumption of the second unit under the operation condition of the condensing water heating air heater system; is the heat consumption rate of the second steam turbine; is the fuel efficiency of the second boiler; η p is the system pipeline efficiency; L” is the second plant electricity consumption rate.

[0031] As an embodiment of the present invention, obtaining the energy consumption of the condensing water heating air heater system based on the power supply coal consumption of the first unit and the power supply coal consumption of the second unit in the above method includes: based on the power supply coal consumption of the first unit and the power supply coal consumption of the second unit, using the following formula to obtain the energy consumption of the condensing water heating air heater system:

[0032] Δb = b″ - b′;

[0033] wherein, Δb is the energy consumption of the condensing water heating air heater system; b' is the power supply coal consumption of the first unit; b″ is the power supply coal consumption of the second unit.

[0034] According to a second aspect of the present invention, there is provided an energy consumption analysis device for a condensing water heating air heater system, the device comprising: a parameter acquisition unit for simultaneously acquiring coal consumption analysis parameters under the shutdown condition and the operating condition when the condensing water heating air heater system is in operation, the coal consumption analysis parameters under the shutdown condition including the first boiler fuel efficiency after inlet air temperature correction and the first steam turbine heat consumption rate after parameter correction, and the coal consumption analysis parameters under the operating condition including the booster pump power, the second boiler fuel efficiency after inlet air temperature correction, the second steam turbine heat consumption rate after parameter correction, the second plant power consumption rate, and the generator output power; a plant power consumption rate acquisition unit for obtaining the first plant power consumption rate of the condensing water heating air heater system under the shutdown condition based on the booster pump power, the second plant power consumption rate, and the generator output power; a first power supply coal consumption acquisition unit for obtaining the first unit power supply coal consumption of the condensing water heating air heater system under the shutdown condition based on the first boiler fuel efficiency, the first steam turbine heat consumption rate, and the first plant power consumption rate; a second power supply coal consumption acquisition unit for obtaining the second unit power supply coal consumption of the condensing water heating air heater system under the operating condition based on the second boiler fuel efficiency, the second steam turbine heat consumption rate, and the second plant power consumption rate; and an energy consumption acquisition unit for obtaining the energy consumption of the condensing water heating air heater system based on the first unit power supply coal consumption and the second unit power supply coal consumption.

[0035] As an embodiment of the present invention, the parameter acquisition unit obtaining the first boiler fuel efficiency after inlet air temperature correction under the shutdown condition when the condensing water heating air heater system is in operation includes: based on the test parameters when the condensing water heating air heater system is in operation, using the following formula to obtain the first boiler fuel efficiency after inlet air temperature correction under the shutdown condition:

[0036]

[0037] Wherein, is the first boiler fuel efficiency after inlet air temperature correction under the shutdown condition of the condensing water heating air heater system; is the heat loss due to flue gas after inlet air temperature correction under the shutdown condition of the condensing water heating air heater system; q3 is the heat loss due to incomplete combustion of gas; q4 is the heat loss due to incomplete combustion of solid; q5 is the heat loss due to heat dissipation; is the sensible heat loss of ash due to inlet air temperature correction under the shutdown condition of the condensing water heating air heater system; q 0th is other losses; is the percentage of the external heat to the lower calorific value of the fuel after inlet air temperature correction under the shutdown condition of the condensing water heating air heater system.

[0038] As an embodiment of the present invention, the above parameter acquisition unit obtains the first steam turbine heat rate after parameter correction under the shutdown condition during the operation condition of the condensate heating air heater system, including: based on the test parameters under the operation condition of the condensate heating air heater system, obtaining the first steam turbine heat rate after parameter correction under the shutdown condition by using the following formula:

[0039]

[0040] wherein, H' is the steam turbine heat rate under the shutdown condition of the condensate heating air heater system; is the first steam turbine heat rate after parameter correction under the shutdown condition of the condensate heating air heater system; C is the correction coefficient of the steam turbine heat rate; q m1 is the superheated steam flow rate; h1 is the superheated steam enthalpy; q m3 is the hot reheat steam flow rate; h3 is the hot reheat steam enthalpy; q m11 is the boiler feed water flow rate; h 11 is the boiler feed water enthalpy; q m2 is the high pressure extraction steam flow rate; h2 is the high pressure extraction steam enthalpy; q mis is the attemperating water flow rate for superheated steam; h is is the attemperating water enthalpy for superheated steam; q mir is the attemperating water flow rate for reheating; h ir is the attemperating water enthalpy for reheating; q m4 is the condensate flow rate in the condensate heating air heater; h4 is the condensate enthalpy from the outlet of the low pressure heater to the condensate heating air heater; h5 is the condensate enthalpy returned from the condensate heating air heater to the inlet of the low pressure heater; P is the generator output power under the operation condition of the condensate heating air heater system.

[0041] As an embodiment of the present invention, the above parameter acquisition unit obtains the second boiler fuel efficiency after inlet air temperature correction under the operation condition of the condensate heating air heater system, including: based on the test parameters under the operation condition of the condensate heating air heater system, obtaining the second boiler fuel efficiency after inlet air temperature correction under the operation condition by using the following formula:

[0042]

[0043] wherein, is the second boiler fuel efficiency after inlet air temperature correction under the operation condition of the condensate heating air heater system; is the heat loss of flue gas after inlet air temperature correction under the operation condition of the condensate heating air heater system; q3 is the heat loss due to incomplete combustion of gas; q4 is the heat loss due to incomplete combustion of solid; q5 is the heat loss due to heat dissipation; is the sensible heat loss of ash and slag after inlet air temperature correction under the operation condition of the condensate heating air heater system; q 0th is other losses; It is the percentage of the external heat after the inlet air temperature correction to the low calorific value of the fuel under the operating conditions of the condensing water heater system.

[0044] As an embodiment of the present invention, the above parameter acquisition unit obtains the corrected second steam turbine heat rate under the operating conditions of the condensing water heater system, including: based on the test parameters under the operating conditions of the condensing water heater system, using the following formula to obtain the corrected second steam turbine heat rate under the operating conditions:

[0045]

[0046] Among them, H” is the steam turbine heat rate under the operating conditions of the condensing water heater system; is the corrected second steam turbine heat rate under the operating conditions of the condensing water heater system; C is the correction coefficient of the steam turbine heat rate; q m1 is the superheated steam flow; h1 is the superheated steam enthalpy; q m3 is the hot reheat steam flow; h3 is the hot reheat steam enthalpy; q m11 is the boiler feed water flow; h 11 is the boiler feed water enthalpy; q m2 is the high pressure extraction steam flow; h2 is the high pressure extraction steam enthalpy; q mis is the desuperheating water flow for superheated steam; h is is the desuperheating water enthalpy for superheated steam; q mir is the desuperheating water flow for reheating; h ir is the desuperheating water enthalpy for reheating; P is the generator output power under the operating conditions of the condensing water heater system.

[0047] As an embodiment of the present invention, the above plant power consumption rate acquisition unit is specifically used for: based on the booster pump power, the second plant power consumption rate and the generator output power, using the following formula to obtain the first plant power consumption rate under the shutdown conditions of the condensing water heater system:

[0048]

[0049] Among them, L' is the first plant power consumption rate under the shutdown conditions of the condensing water heater system; L” is the second plant power consumption rate; P b is the booster pump power; P is the generator output power.

[0050] As an embodiment of the present invention, the above first power supply coal consumption acquisition unit is specifically used for: based on the first boiler fuel efficiency, the first steam turbine heat rate and the first plant power consumption rate, using the following formula to obtain the first unit power supply coal consumption under the shutdown conditions of the condensing water heater system:

[0051]

[0052] wherein, b' is the power supply coal consumption of the first unit under the shutdown condition of the condensing water heating air heater system; is the heat consumption rate of the first steam turbine; is the fuel efficiency of the first boiler; η p is the system pipeline efficiency; L' is the first plant power consumption rate.

[0053] As an embodiment of the present invention, the above-mentioned second power supply coal consumption acquisition unit is specifically configured to: based on the second boiler fuel efficiency, the second steam turbine heat consumption rate, and the second plant power consumption rate, use the following formula to obtain the second unit power supply coal consumption under the operation condition of the condensing water heating air heater system:

[0054]

[0055] wherein, b” is the power supply coal consumption of the second unit under the operation condition of the condensing water heating air heater system; is the heat consumption rate of the second steam turbine; is the fuel efficiency of the second boiler; η p is the system pipeline efficiency; L” is the second plant power consumption rate.

[0056] As an embodiment of the present invention, the above-mentioned energy consumption acquisition unit is specifically configured to: based on the power supply coal consumption of the first unit and the power supply coal consumption of the second unit, use the following formula to obtain the energy consumption of the condensing water heating air heater system:

[0057] Δb = b″ - b';

[0058] wherein, Δb is the energy consumption of the condensing water heating air heater system; b' is the power supply coal consumption of the first unit; b″ is the power supply coal consumption of the second unit.

[0059] According to the third aspect of the present invention, there is provided an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, the steps of the above method are implemented.

[0060] According to the fourth aspect of the present invention, there is provided a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the above method are implemented.

[0061] According to the fifth aspect of the present invention, there is provided a computer program product, including a computer program / instructions. When the computer program / instructions are executed by a processor, the steps of the above method are implemented.

[0062] As can be seen from the above technical solution, the method and device for analyzing the energy consumption of the condensing water heater system provided by the present invention can obtain the power supply coal consumption of the unit under the shutdown condition of the condensing water heater system and the power supply coal consumption of the unit under the operation condition of the condensing water heater system by testing relevant parameters under the operation condition of the condensing water heater system, and then calculate the difference between the two to obtain the energy consumption of the condensing water heater system. Therefore, compared with the conventional energy consumption analysis and calculation method, the energy consumption analysis and calculation method of this application has less workload and higher test accuracy. At the same time, since this application does not require tests and parameter tests under the shutdown condition, the sampling error is reduced, and the influence of parameters such as unit operation parameters and coal quality of the coal fed into the furnace on the test is reduced, so that the evaluation of the energy consumption of the condensing water heater system in this application is more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts. In the drawings:

[0064] Figure 1 is a schematic flow chart of a method for analyzing the energy consumption of a condensing water heater system provided by an embodiment of the present application;

[0065] Figure 2 is a schematic diagram of the principle for dividing the boundary of the boiler heat balance system of a coal-fired unit provided by an embodiment of the present application;

[0066] Figure 3 is a schematic structural diagram of a device for analyzing the energy consumption of a condensing water heater system provided by an embodiment of the present application;

[0067] Figure 4 is a schematic diagram of an electronic device provided by an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0068] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following further describes the embodiments of the present invention in detail with reference to the drawings. Here, the illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but not to limit the present invention.

[0069] As Figure 1 shown is a schematic flow chart of a method for analyzing the energy consumption of a condensing water heater system provided by an embodiment of the present application. The method includes the following steps:

[0070] Step S101: Under the operating condition of the condensing water heating air heater system, obtain the coal consumption analysis parameters under both the shutdown condition and the operating condition simultaneously. The coal consumption analysis parameters under the shutdown condition include the first boiler fuel efficiency corrected by the inlet air temperature and the first steam turbine heat consumption rate corrected by the parameters. The coal consumption analysis parameters under the operating condition include the booster pump power, the second boiler fuel efficiency corrected by the inlet air temperature, the second steam turbine heat consumption rate corrected by the parameters, the second plant power consumption rate, and the generator output power.

[0071] In this embodiment, under the operating condition of the condensing water heating air heater system, the key coal consumption analysis parameters under both the shutdown condition and the operating condition can be obtained simultaneously, thus avoiding the cumbersome process of separately testing under the two conditions in the traditional energy consumption analysis method. Among them, the first boiler fuel efficiency corrected by the inlet air temperature and the first steam turbine heat consumption rate corrected by the parameters under the shutdown condition of the condensing water heating air heater system can both be obtained under the operating condition.

[0072] In addition, in this embodiment, the generator output power under the shutdown condition of the condensing water heating air heater system is set as the generator output power under the operating condition, that is, the generator output powers under the two conditions are considered to be the same. The generator output power in the coal consumption analysis parameters of this step is the generator output power under the operating condition, which can be used as an intermediate parameter to calculate the first steam turbine heat consumption rate and the second steam turbine heat consumption rate in the coal consumption analysis parameters.

[0073] Step S102: Obtain the first plant power consumption rate under the shutdown condition of the condensing water heating air heater system based on the booster pump power, the second plant power consumption rate, and the generator output power.

[0074] That is, in this embodiment, the first plant power consumption rate under the shutdown condition can be further obtained through the relevant test parameters under the operating condition of the condensing water heating air heater system.

[0075] Step S103: Obtain the first unit power supply coal consumption under the shutdown condition of the condensing water heating air heater system based on the first boiler fuel efficiency, the first steam turbine heat consumption rate, and the first plant power consumption rate.

[0076] Step S104: Obtain the second unit power supply coal consumption under the operating condition of the condensing water heating air heater system based on the second boiler fuel efficiency, the second steam turbine heat consumption rate, and the second plant power consumption rate.

[0077] The method used in this step to calculate the second unit power supply coal consumption under the operating condition of the condensing water heating air heater system is the same as the existing technology.

[0078] Step S105: Obtain the energy consumption of the condensing water heating air heater system based on the first unit power supply coal consumption and the second unit power supply coal consumption.

[0079] Specifically, by calculating the difference between the power supply coal consumption of the first unit and that of the second unit, that is, the value obtained by subtracting the power supply coal consumption of the first unit from that of the second unit, the energy consumption of the condensate water heater system can be obtained, because the power supply coal consumption of the second unit includes the increased energy consumption due to the operation of the condensate water heater system.

[0080] As can be seen from the above technical solution, the method for analyzing the energy consumption of the condensate water heater system provided by the present invention can obtain the power supply coal consumption of the unit under the shutdown condition of the condensate water heater system and the power supply coal consumption of the unit under the operation condition of the condensate water heater system by testing relevant parameters under the operation condition of the condensate water heater system, and then calculate the difference between the two to obtain the energy consumption of the condensate water heater system. Therefore, compared with the conventional method for analyzing and calculating energy consumption, the method for analyzing and calculating energy consumption in this application has less workload and higher test accuracy. At the same time, since this application does not require tests and parameter measurements under the shutdown condition, the sampling error is reduced, and the influence of parameters such as unit operation parameters and coal quality of the coal fed into the furnace on the test is reduced, so that the evaluation of the energy consumption of the condensate water heater system in this application is more accurate.

[0081] As Figure 2 shown in the schematic diagram of the boundary division principle of the boiler thermal balance system of the embodiment of this application for a coal-fired unit boiler, Figure 2 it has 5 boundaries, where boundary 1 and boundary 4 are on the primary cold air passage, boundary 2 and boundary 5 are on the secondary cold air passage, and boundary 3 is at the flue gas outlet of the air preheater. More specifically, boundary 1 and boundary 2 are between the condensate water heater and the air preheater, and boundary 4 and boundary 5 are between the primary and secondary cold air inlets and the condensate water heater.

[0082] The inventor found that if the inlet boundary of the boiler thermal balance system is set at Figure 2 boundary 1 and boundary 2 in Figure 2 and the outlet boundary is set at

[0083] boundary 3 in

[0084] Figure 2 Under the boundary conditions of this boiler thermal balance system, the shutdown and operation of the condensate water heater system will have no impact on the boiler fuel efficiency after the inlet air temperature is corrected.

[0085]

[0086] Among them,

[0087] η fg.AH , the flue gas side efficiency of the air preheater, %;

[0088] tfg.AH.en.m , the flue gas temperature at the inlet of the air preheater, °C;

[0089] t fg.AH.lv.nl , the flue gas temperature at the outlet of the air preheater after correction for no air leakage, °C;

[0090] t a.AH.en.m , the air temperature at the inlet of the air preheater, °C;

[0091] ω lg.AH , the air leakage rate of the air preheater, %;

[0092] c p.a , the specific heat capacity of air at constant pressure, kJ / (m 3 ·K);

[0093] t fg.AH.lv.m , the flue gas temperature at the outlet of the air preheater, °C;

[0094] c p.fg , the specific heat capacity of flue gas at constant pressure, kJ / (m 3 ·K).

[0095] Taking Figure 2 the boundaries 1, 2, and 3 in the above as the boundaries of the boiler heat balance system. Under the conditions of the condensate heater air heater system being out of service and in service, the flue gas side efficiency η fg.AH of the air preheater, the flue gas temperature t fg.AH.en.m at the inlet of the air preheater, the air leakage rate ω lg.AH of the air preheater, the specific heat capacity c p.a of air at constant pressure, and the specific heat capacity c p.fg of flue gas at constant pressure change little and can be ignored. Then, it can be seen from formulas (1) and (2) that: the flue gas temperature t fg.AH.lv.m at the outlet of the air preheater and the air temperature t a.AH.en.m at the inlet of the air preheater have a one-to-one correspondence. That is, when the air temperature t a.AH.en.m at the inlet of the air preheater is a fixed value, the flue gas temperature t fg.AH.lv.m at the outlet of the air preheater is also a fixed value.

[0096] Under the conditions of the condensate heater air heater system being out of service and in service, the actual air temperatures at the inlet of the air preheater are not equal, but the designed air temperatures at the inlet of the air preheater are equal. Then, the exhaust gas temperatures after correction for the inlet air temperature are equal, the percentages of the external heat to the lower calorific value of the fuel after correction for the inlet air temperature are equal, and the exhaust gas heat losses and the physical sensible heat losses of the ash after correction for the inlet air temperature are equal. Other parameters of the two are also equal. Therefore, the operation or shutdown of the condensate heater air heater system has no impact on the boiler fuel efficiency after correction for the inlet air temperature.

[0097] Based on the above conclusions, preferably, obtaining the corrected first boiler fuel efficiency at the inlet air temperature under the shutdown condition during the operation of the condensing water heater system in the above step S101 may further include:

[0098] Based on the test parameters under the operation condition of the condensing water heater system, use the following formula (3) to obtain the corrected first boiler fuel efficiency at the inlet air temperature under the shutdown condition:

[0099]

[0100] Wherein,

[0101] represents the corrected first boiler fuel efficiency at the inlet air temperature under the shutdown condition of the condensing water heater system, %;

[0102] represents the corrected heat loss due to flue gas discharge at the inlet air temperature under the shutdown condition of the condensing water heater system, %, which is calculated from the design parameters and test parameters (including primary air volume, primary air temperature, secondary air volume, secondary air temperature) at the boundary between the condensing water heater and the air preheater in the condensing water heater system (i.e., Figure 2 boundary 1 and boundary 2 in Figure 2 ), and the test parameters (including oxygen content in flue gas, carbon monoxide content in flue gas, flue gas temperature) at the flue gas outlet boundary of the air preheater (i.e.,

[0103] q3 represents the heat loss due to incomplete combustion of gas, %, and the shutdown and operation of the condensing water heater system have no influence on this heat loss, and the correction of the inlet air temperature has no influence on this heat loss;

[0104] q4 represents the heat loss due to incomplete combustion of solid, %, and the shutdown and operation of the condensing water heater system have no influence on this heat loss, and the correction of the inlet air temperature has no influence on this heat loss;

[0105] q5 represents the heat dissipation loss, %, and the shutdown and operation of the condensing water heater system have no influence on this heat loss, and the correction of the inlet air temperature has no influence on this heat loss;

[0106] represents the corrected sensible heat loss of ash residue at the inlet air temperature under the shutdown condition of the condensing water heater system, %, which is calculated from the design parameters and test parameters (including primary air volume, primary air temperature, secondary air volume, secondary air temperature) at the boundary between the condensing water heater and the air preheater in the condensing water heater system (i.e., Figure 2 boundary 1 and boundary 2 in Figure 2 ), and the test parameters (including oxygen content in flue gas, carbon monoxide content in flue gas, flue gas temperature) at the flue gas outlet boundary of the air preheater (i.e.,

[0107] q 0th , representing other losses, %, the shutdown and startup of the condensing water heater system have no impact on this thermal loss, and the inlet air temperature correction has no impact on this thermal loss;

[0108] Represents the percentage of the external heat after inlet air temperature correction under the shutdown condition of the condensing water heater system to the lower calorific value of the fuel, %, which is calculated from the design parameters and test parameters (including primary air volume, primary air temperature, secondary air volume, secondary air temperature) at the boundary between the condensing water heater and the air preheater in the condensing water heater system (i.e., Figure 2 Boundary 1 and boundary 2 in).

[0109] Further preferably, obtaining the first turbine heat rate after parameter correction under the shutdown condition in the above step S101 can further include:

[0110] Based on the test parameters under the startup condition of the condensing water heater system, use the following formulas (4) and (5) to obtain the first turbine heat rate after parameter correction under the shutdown condition:

[0111]

[0112] Wherein,

[0113] H', represents the turbine heat rate under the shutdown condition of the condensing water heater system, kJ / (kW·h);

[0114] Represents the first turbine heat rate after parameter correction under the shutdown condition of the condensing water heater system, kJ / (kW·h);

[0115] C, represents the correction coefficient of the turbine heat rate;

[0116] q m1 , represents the superheated steam flow rate, kg / h;

[0117] h1, represents the superheated steam enthalpy, kJ / kg;

[0118] q m3 , represents the hot reheat steam flow rate, kg / h;

[0119] h3, represents the hot reheat steam enthalpy, kJ / kg;

[0120] q m11 , represents the boiler feed water flow rate, kg / h;

[0121] h 11 , represents the boiler feed water enthalpy, kJ / kg;

[0122] qm2 , representing the high-pressure exhaust steam flow rate, kg / h;

[0123] h2 represents the enthalpy of the high-pressure exhaust steam, kJ / kg;

[0124] q mis , representing the superheated desuperheating water flow rate, kg / h;

[0125] h is , representing the enthalpy of the superheated desuperheating water, kJ / kg;

[0126] q mir , representing the reheater desuperheating water flow rate, kg / h;

[0127] h ir , representing the enthalpy of the reheater desuperheating water, kJ / kg;

[0128] q m4 , representing the condensate water flow rate in the condensate water air heater, kg / h;

[0129] h4 represents the enthalpy of the condensate water flowing from the outlet of the low-pressure heater to the condensate water air heater, kJ / kg;

[0130] h5 represents the enthalpy of the condensate water returning from the condensate water air heater to the inlet of the low-pressure heater, kJ / kg;

[0131] P represents the output power of the generator under the operating conditions of the condensate water air heater system, kW.

[0132] C, q in the above parameters m1 , h1, q m3 , h3, q m11 , h 11 , q m2 , h2, q mis , h is , q mir , h ir , q m4 , h4, h5. The detailed calculation method can be found in GB / T8117.2-2008 / IEC60953-2:1990 "Steam Turbine Thermal Performance Acceptance Test Code - Part 2: Method B - Wide Accuracy Tests for Steam Turbines of All Types and Sizes".

[0133] When the condensate water air heater system is put into operation, it increases the inlet air temperature of the air preheater, improves the boiler fuel efficiency, and also increases the heat consumption rate of the steam turbine. At this time, it is necessary to redefine the boundary of the boiler heat balance system.

[0134] Under the operating conditions of the condensate water air heater system, the inlet boundary of the boiler flue gas system is set at Figure 2 Boundary 4 and Boundary 5 in Figure 2The boundary 3 in it. Then, under the boundary conditions of the boiler heat balance system, a boiler fuel efficiency test is carried out to calculate the boiler fuel efficiency and the boiler fuel efficiency after inlet air temperature correction.

[0135] Therefore, preferably, obtaining the second boiler fuel efficiency after inlet air temperature correction under the operating condition of the condensate water heater system in the above step S101 includes:

[0136] Based on the test parameters under the operating condition of the condensate water heater system, the second boiler fuel efficiency after inlet air temperature correction under the operating condition is obtained by using the following formula (6):

[0137]

[0138] Where,

[0139] represents the second boiler fuel efficiency after inlet air temperature correction under the operating condition of the condensate water heater system, %;

[0140] represents the heat loss of flue gas after inlet air temperature correction under the operating condition of the condensate water heater system, %, which is calculated from the design parameters and test parameters (including primary air volume, primary air temperature, secondary air volume, secondary air temperature) of the boundary between the primary and secondary cold air inlets and the condensate water heater in the condensate water heater system (i.e., Figure 2 the boundaries 4 and 5 in it), and the test parameters (including flue gas oxygen content, flue gas carbon monoxide content, flue gas temperature) of the flue gas outlet boundary of the air preheater (i.e., Figure 2 the boundary 3 in it);

[0141] q3 represents the heat loss due to incomplete combustion of gas, %, and the shutdown and operation of the heat medium water heater system have no effect on this heat loss, and the inlet air temperature correction has no effect on this heat loss;

[0142] q4 represents the heat loss due to incomplete combustion of solid, %, and the shutdown and operation of the heat medium water heater system have no effect on this heat loss, and the inlet air temperature correction has no effect on this heat loss;

[0143] q5 represents the heat dissipation loss, %, and the shutdown and operation of the heat medium water heater system have no effect on this heat loss, and the inlet air temperature correction has no effect on this heat loss;

[0144] represents the sensible heat loss of ash residue after inlet air temperature correction under the operating condition of the condensate water heater system, %, which is from the boundary between the primary and secondary cold air inlets and the condensate water heater in the condensate water heater system (i.e., Figure 2The design parameters and test parameters (including primary air volume, primary air temperature, secondary air volume, secondary air temperature) of the boundaries 4 and 5) therein, and the test parameters (including flue gas oxygen content, flue gas carbon monoxide content, flue gas temperature) of the flue gas outlet boundary of the air preheater (i.e., Figure 2 the boundary 3) therein are calculated;

[0145] q 0th , representing other losses, %, the shutdown and startup of the heat medium water heater system have no impact on this heat loss, and the inlet air temperature correction has no impact on this heat loss;

[0146] represents the percentage of the external heat after the inlet air temperature correction under the operating condition of the condensate water heater system to the lower calorific value of the fuel, %, and is calculated from the design parameters and test parameters (including primary air volume, primary air temperature, secondary air volume, secondary air temperature) of the boundary between the primary and secondary cold air inlets and the condensate water heater in the condensate water heater system (i.e., Figure 2 the boundaries 4 and 5) therein.

[0147] Further preferably, obtaining the corrected second steam turbine heat rate under the operating condition of the condensate water heater system in the above step S101 includes:

[0148] Based on the test parameters under the operating condition of the condensate water heater system, use the following formulas (7) and (8) to obtain the corrected second steam turbine heat rate under the operating condition:

[0149]

[0150] wherein,

[0151] H”, represents the steam turbine heat rate under the operating condition of the condensate water heater system, kJ / (kW·h);

[0152] represents the corrected second steam turbine heat rate under the operating condition of the condensate water heater system, kJ / (kW·h);

[0153] C, represents the correction coefficient of the steam turbine heat rate;

[0154] q m1 , represents the superheated steam flow rate, kg / h;

[0155] h1, represents the superheated steam enthalpy, kJ / kg;

[0156] q m3 , represents the hot reheat steam flow rate, kg / h;

[0157] h3, represents the hot reheat steam enthalpy, kJ / kg;

[0158] q m11 , representing the boiler feed water flow rate, kg / h;

[0159] h 11 , representing the enthalpy of the boiler feed water, kJ / kg;

[0160] q m2 , representing the high-pressure extraction steam flow rate, kg / h;

[0161] h2, representing the enthalpy of the high-pressure extraction steam, kJ / kg;

[0162] q mis , representing the attemperating water flow rate for superheated steam, kg / h;

[0163] h is , representing the enthalpy of the attemperating water for superheated steam, kJ / kg;

[0164] q mir , representing the attemperating water flow rate for reheated steam, kg / h;

[0165] h ir , representing the enthalpy of the attemperating water for reheated steam, kJ / kg;

[0166] P represents the output power of the generator under the operating condition of the condensate water heater system, kW.

[0167] C, q in the above parameters m1 、h1、q m3 、h3、q m11 、h 11 、q m2 、h2、q mis 、h is 、q mir 、h ir , for the detailed calculation method, reference can be made to GB / T8117.2-2008 / IEC60953-2:1990 "Steam Turbine Thermal Performance Acceptance Test Code - Part 2: Method B - Wide Accuracy Tests for Steam Turbines of All Types and Sizes".

[0168] Preferably, obtaining the first plant power consumption rate under the shutdown condition of the condensate water heater system based on the booster pump power, the second plant power consumption rate, and the generator output power in step S102 may further include:

[0169] Based on the booster pump power, the second plant power consumption rate, and the generator output power, the first plant power consumption rate under the shutdown condition of the condensate water heater system is obtained by using the following formula (9):

[0170]

[0171] Among them, L' is the first plant power consumption rate under the shutdown condition of the condensing water heating air heater system; L'' is the second plant power consumption rate; P b is the power of the booster pump; P is the output power of the generator.

[0172] Preferably, obtaining the first unit power supply coal consumption under the shutdown condition of the condensing water heating air heater system based on the first boiler fuel efficiency, the first steam turbine heat consumption rate, and the first plant power consumption rate in the above step S103 may further include:

[0173] Based on the first boiler fuel efficiency, the first steam turbine heat consumption rate, and the first plant power consumption rate, use the following formula (10) to obtain the first unit power supply coal consumption under the shutdown condition of the condensing water heating air heater system:

[0174]

[0175] Among them,

[0176] b', represents the first unit power supply coal consumption under the shutdown condition of the condensing water heating air heater system, g / (kW·h);

[0177] represents the first steam turbine heat consumption rate, kJ / (kW·h);

[0178] represents the first boiler fuel efficiency, %;

[0179] η p , represents the system pipeline efficiency, %, generally taking 99%;

[0180] L', represents the first plant power consumption rate.

[0181] Preferably, obtaining the second unit power supply coal consumption under the operation condition of the condensing water heating air heater system based on the second boiler fuel efficiency, the second steam turbine heat consumption rate, and the second plant power consumption rate in the above step S104 may further include:

[0182] Based on the second boiler fuel efficiency, the second steam turbine heat consumption rate, and the second plant power consumption rate, use the following formula (11) to obtain the second unit power supply coal consumption under the operation condition of the condensing water heating air heater system:

[0183]

[0184] Among them,

[0185] b”, represents the second unit power supply coal consumption under the operation condition of the condensing water heating air heater system, g / (kW·h);

[0186] represents the second steam turbine heat consumption rate, kJ / (kW·h);

[0187] Indicates the fuel efficiency of the second boiler, %.

[0188] η p , indicating the system pipeline efficiency, %, generally taking 99%;

[0189] "L", indicating the second plant power consumption rate.

[0190] Preferably, the energy consumption of the condensate heating air heater system obtained based on the power supply coal consumption of the first unit and the power supply coal consumption of the second unit in step S105 may further include:

[0191] Based on the power supply coal consumption of the first unit and the power supply coal consumption of the second unit, the energy consumption of the condensate heating air heater system is obtained by using the following formula (12):

[0192] Δb = b" - b' (12)

[0193] Wherein,

[0194] Δb represents the energy consumption of the condensate heating air heater system, that is, the increase in the power supply coal consumption of the unit under the operating condition of the condensate heating air heater system relative to the shutdown condition, g / (kW·h);

[0195] b' represents the power supply coal consumption of the first unit, g / (kW·h);

[0196] b" represents the power supply coal consumption of the second unit, g / (kW·h).

[0197] As can be seen from the above, the present application redefines the boundaries of the thermal balance system of the coal-fired unit under the shutdown and operating conditions of the condensate heating air heater system, so that the boiler fuel efficiency, the thermal consumption rate of the steam turbine, and the power supply coal consumption of the unit under each condition can be accurately calculated. Under the shutdown condition of the condensate heating air heater system, the condensate heating air heater system is classified outside the boiler thermal balance system and at the same time outside the steam turbine thermal balance system. Under the operating condition of the condensate heating air heater system, the condensate heating air heater system is classified inside the boiler thermal balance system and at the same time inside the steam turbine thermal balance system.

[0198] The present application can calculate the power supply coal consumption of the unit under the shutdown condition of the condensate heating air heater system and the power supply coal consumption of the unit under the operating condition of the condensate heating air heater system by testing relevant parameters under the operating condition of the condensate heating air heater system. The difference between the two is the energy consumption of the condensate heating air heater system. Compared with the conventional energy consumption analysis and calculation method, the energy consumption analysis and calculation method of the present application has less workload and higher test accuracy. At the same time, the sampling error is reduced, and the influence of parameters such as the operating parameters of the unit and the quality of the coal fed into the furnace on the test is reduced. The evaluation of the energy consumption of the condensate heating air heater system is more accurate.

[0199] The method of the present application can be used to guide the detection and calculation of the power supply coal consumption of a coal-fired unit with a condensing water heater system, enabling power plant personnel to obtain accurate power supply coal consumption of the coal-fired unit and providing a technical reference for power plant personnel to make appropriate unit operation adjustments based on the above data. At the same time, it can also evaluate the economy of the transformation of the condensing water heater system carried out by the power plant, guide the power plant to conduct reasonable transformation evaluations, and make reasonable parameter adjustments to the condensing water heater system based on the above data to ensure the safe and economic operation of the coal-fired unit.

[0200] As Figure 3 Shown in the figure is a schematic structural diagram of an energy consumption analysis device for a condensing water heater system provided by an embodiment of the present application. The device includes: a parameter acquisition unit 310, a plant power consumption rate acquisition unit 320, a first power supply coal consumption acquisition unit 330, a second power supply coal consumption acquisition unit 340, and an energy consumption acquisition unit 350, which are connected in sequence.

[0201] The parameter acquisition unit 310 is configured to simultaneously acquire coal consumption analysis parameters under the shutdown condition and the operation condition when the condensing water heater system is in the operation condition. The coal consumption analysis parameters under the shutdown condition include the first boiler fuel efficiency after inlet air temperature correction and the first steam turbine heat consumption rate after parameter correction. The coal consumption analysis parameters under the operation condition include the booster pump power, the second boiler fuel efficiency after inlet air temperature correction, the second steam turbine heat consumption rate after parameter correction, the second plant power consumption rate, and the generator output power.

[0202] The plant power consumption rate acquisition unit 320 is configured to obtain the first plant power consumption rate of the condensing water heater system under the shutdown condition based on the booster pump power, the second plant power consumption rate, and the generator output power.

[0203] The first power supply coal consumption acquisition unit 330 is configured to obtain the first unit power supply coal consumption of the condensing water heater system under the shutdown condition based on the first boiler fuel efficiency, the first steam turbine heat consumption rate, and the first plant power consumption rate.

[0204] The second power supply coal consumption acquisition unit 340 is configured to obtain the second unit power supply coal consumption of the condensing water heater system under the operation condition based on the second boiler fuel efficiency, the second steam turbine heat consumption rate, and the second plant power consumption rate.

[0205] The energy consumption acquisition unit 350 is configured to obtain the energy consumption of the condensing water heater system based on the first unit power supply coal consumption and the second unit power supply coal consumption.

[0206] As an embodiment of the present invention, the above-mentioned parameter acquisition unit 310 obtains the first boiler fuel efficiency after the inlet air temperature is corrected under the shutdown condition during the operation condition of the condensing water heater system, including: based on the test parameters under the operation condition of the condensing water heater system, the following formula is used to obtain the first boiler fuel efficiency after the inlet air temperature is corrected under the shutdown condition:

[0207]

[0208] Wherein, is the first boiler fuel efficiency after the inlet air temperature is corrected under the shutdown condition of the condensing water heater system; is the heat loss of the flue gas after the inlet air temperature is corrected under the shutdown condition of the condensing water heater system; q3 is the heat loss of incomplete combustion of gas; q4 is the heat loss of incomplete combustion of solid; q5 is the heat loss of heat dissipation; is the sensible heat loss of ash residue after the inlet air temperature is corrected under the shutdown condition of the condensing water heater system; q 0th is other losses; is the percentage of the external heat to the lower calorific value of the fuel after the inlet air temperature is corrected under the shutdown condition of the condensing water heater system.

[0209] Preferably, the above-mentioned parameter acquisition unit 310 obtains the first steam turbine heat consumption rate after the parameters are corrected under the shutdown condition during the operation condition of the condensing water heater system, including: based on the test parameters under the operation condition of the condensing water heater system, the following formula is used to obtain the first steam turbine heat consumption rate after the parameters are corrected under the shutdown condition:

[0210]

[0211] Wherein, H' is the steam turbine heat consumption rate under the shutdown condition of the condensing water heater system; is the first steam turbine heat consumption rate after the parameters are corrected under the shutdown condition of the condensing water heater system; C is the correction coefficient of the steam turbine heat consumption rate; q m1 is the superheated steam flow rate; h1 is the enthalpy of superheated steam; q m3 is the hot reheat steam flow rate; h3 is the enthalpy of hot reheat steam; q m11 is the boiler feed water flow rate; h 11 is the enthalpy of boiler feed water; q m2 is the high pressure extraction steam flow rate; h2 is the enthalpy of high pressure extraction steam; q mis is the superheated desuperheating water flow rate; h is is the enthalpy of superheated desuperheating water; q mir is the reheater desuperheating water flow rate; h ir is the enthalpy of reheater desuperheating water; q m4where, D is the condensate water flow rate in the condensate water heater; h4 is the enthalpy of the condensate water flowing from the outlet of the low-pressure heater to the condensate water heater; h5 is the enthalpy of the condensate water returning from the condensate water heater to the inlet of the low-pressure heater; P is the output power of the generator under the operating conditions of the condensate water heater system.

[0212] Preferably, the parameter acquisition unit 310 obtains the corrected second boiler fuel efficiency with respect to the inlet air temperature under the operating conditions of the condensate water heater system as follows: Based on the test parameters under the operating conditions of the condensate water heater system, the corrected second boiler fuel efficiency with respect to the inlet air temperature under the operating conditions is obtained using the following formula:

[0213]

[0214] where, is the corrected second boiler fuel efficiency with respect to the inlet air temperature under the operating conditions of the condensate water heater system; is the corrected heat loss of the flue gas with respect to the inlet air temperature under the operating conditions of the condensate water heater system; q3 is the heat loss due to incomplete combustion of gas; q4 is the heat loss due to incomplete combustion of solid; q5 is the heat loss due to heat dissipation; is the sensible heat loss of the ash due to the corrected inlet air temperature under the operating conditions of the condensate water heater system; q 0th is other losses; is the percentage of the external heat to the low calorific value of the fuel with respect to the corrected inlet air temperature under the operating conditions of the condensate water heater system.

[0215] Preferably, the parameter acquisition unit 310 obtains the corrected second steam turbine heat consumption rate with respect to the parameters under the operating conditions of the condensate water heater system as follows: Based on the test parameters under the operating conditions of the condensate water heater system, the corrected second steam turbine heat consumption rate with respect to the parameters under the operating conditions is obtained using the following formula:

[0216]

[0217] where, H” is the steam turbine heat consumption rate under the operating conditions of the condensate water heater system; is the corrected second steam turbine heat consumption rate with respect to the parameters under the operating conditions of the condensate water heater system; C is the correction coefficient of the steam turbine heat consumption rate; q m1 is the superheated steam flow rate; h1 is the enthalpy of the superheated steam; q m3 is the hot reheat steam flow rate; h3 is the enthalpy of the hot reheat steam; q m11 is the boiler feed water flow rate; h 11 is the enthalpy of the boiler feed water; q m2 is the high-pressure extraction steam flow rate; h2 is the enthalpy of the high-pressure extraction steam; q mis is the superheated desuperheating water flow rate; h is is the enthalpy of the superheated desuperheating water; q mir is the reheat desuperheating water flow rate; hir is the enthalpy of the reheater desuperheating water; P is the generator output power under the operating conditions of the condensate water heater system.

[0218] As an embodiment of the present invention, the above-mentioned plant power consumption acquisition unit 320 is specifically configured to: based on the booster pump power, the second plant power consumption rate, and the generator output power, use the following formula to obtain the first plant power consumption rate under the shutdown conditions of the condensate water heater system:

[0219]

[0220] wherein, L' is the first plant power consumption rate under the shutdown conditions of the condensate water heater system; L” is the second plant power consumption rate; P b is the booster pump power; P is the generator output power.

[0221] Preferably, the above-mentioned first power supply coal consumption acquisition unit 330 is specifically configured to: based on the first boiler fuel efficiency, the first steam turbine heat consumption rate, and the first plant power consumption rate, use the following formula to obtain the first unit power supply coal consumption under the shutdown conditions of the condensate water heater system:

[0222]

[0223] wherein, b' is the first unit power supply coal consumption under the shutdown conditions of the condensate water heater system; is the first steam turbine heat consumption rate; is the first boiler fuel efficiency; η p is the system pipeline efficiency; L' is the first plant power consumption rate.

[0224] Preferably, the above-mentioned second power supply coal consumption acquisition unit 340 is specifically configured to: based on the second boiler fuel efficiency, the second steam turbine heat consumption rate, and the second plant power consumption rate, use the following formula to obtain the second unit power supply coal consumption under the operating conditions of the condensate water heater system:

[0225]

[0226] wherein, b” is the second unit power supply coal consumption under the operating conditions of the condensate water heater system; is the second steam turbine heat consumption rate; is the second boiler fuel efficiency; η p is the system pipeline efficiency; L” is the second plant power consumption rate.

[0227] Preferably, the above-mentioned energy consumption acquisition unit 350 is specifically configured to: based on the first unit power supply coal consumption and the second unit power supply coal consumption, use the following formula to obtain the energy consumption of the condensate water heater system:

[0228] Δb = b″ - b′;

[0229] Among them, Δb is the energy consumption of the condensing water heater system; b' is the power supply coal consumption of the first unit; b″ is the power supply coal consumption of the second unit.

[0230] As can be seen from the above technical solution, the energy consumption analysis device for the condensing water heater system provided by the present invention can obtain the power supply coal consumption of the unit under the shutdown condition of the condensing water heater system and the power supply coal consumption of the unit under the operation condition of the condensing water heater system by testing relevant parameters under the operation condition of the condensing water heater system, and then calculate the difference between the two to obtain the energy consumption of the condensing water heater system. Therefore, compared with the conventional energy consumption analysis calculation method, the energy consumption analysis calculation method of this application has less workload and higher test accuracy. At the same time, since this application does not require tests and parameter tests under the shutdown condition, the sampling error is reduced, and the influence of parameters such as unit operation parameters and coal quality of the coal fed into the furnace on the test is reduced, so that the evaluation of the energy consumption of the condensing water heater system by this application is more accurate.

[0231] Figure 4 It is a schematic diagram of the electronic device provided by the embodiment of the present invention. Figure 4 The shown electronic device is a general data processing device, which includes a general computer hardware structure, and at least includes a processor 801 and a memory 802. The processor 801 and the memory 802 are connected through a bus 803. The memory 802 is suitable for storing one or more instructions or programs executable by the processor 801. The one or more instructions or programs are executed by the processor 801 to implement the steps in the above-mentioned energy consumption analysis method of the condensing water heater system.

[0232] The above-mentioned processor 801 can be an independent microprocessor or a set of one or more microprocessors. Thus, the processor 801 executes the commands stored in the memory 802, thereby executing the method flow of the embodiment of the present invention as described above to implement the processing of data and the control of other devices. The bus 803 connects the above-mentioned multiple components together, and at the same time connects the above-mentioned components to a display controller 804, a display device, and an input / output (I / O) device 805. The input / output (I / O) device 805 can be a mouse, a keyboard, a modem, a network interface, a touch input device, a somatosensory input device, a printer, and other devices well known in the art. Typically, the input / output (I / O) device 805 is connected to the system through an input / output (I / O) controller 806.

[0233] Among them, the memory 802 can store software components, such as an operating system, a communication module, an interaction module, and application programs. Each of the above-mentioned modules and application programs corresponds to a set of executable program instructions for completing one or more functions and the methods described in the embodiments of the invention.

[0234] An embodiment of the present invention also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the above-mentioned energy consumption analysis method for the condensing water heating air heater system are implemented.

[0235] An embodiment of the present invention also provides a computer program product, including a computer program / instructions. When the computer program / instructions are executed by a processor, the steps of the above-mentioned energy consumption analysis method for the condensing water heating air heater system are implemented.

[0236] In summary, the energy consumption analysis method and device provided by the present invention can obtain the unit power supply coal consumption under the shutdown condition of the condensing water heating air heater system and the unit power supply coal consumption under the operation condition of the condensing water heating air heater system by testing relevant parameters under the operation condition of the condensing water heating air heater system, and then calculate the difference between the two to obtain the energy consumption of the condensing water heating air heater system. Therefore, compared with the conventional energy consumption analysis calculation method, the energy consumption analysis calculation method of this application has less workload and higher test accuracy. At the same time, since this application does not require tests and parameter tests under the shutdown condition, the sampling error is reduced, and the influence of parameters such as unit operation parameters and coal quality of the coal fed into the furnace on the test is reduced, so that the evaluation of the energy consumption of the condensing water heating air heater system by this application is more accurate.

[0237] The preferred embodiments of the present invention have been described above with reference to the accompanying drawings. Many features and advantages of these embodiments are clear from this detailed description, so the claims are intended to cover all these features and advantages that fall within the true spirit and scope of these embodiments. In addition, since those skilled in the art can easily think of many modifications and changes, the embodiments of the present invention are not limited to the exact structures and operations illustrated and described, but may cover all suitable modifications and equivalents that fall within its scope.

[0238] Those skilled in the art should understand that the embodiments of the present invention can be provided as a method, a system, or a computer program product. Therefore, the present invention can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0239] The present invention is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to embodiments of the present invention. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and combinations of flows 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 the processors of general-purpose computers, special-purpose computers, embedded processors, or other programmable data processing devices to produce a machine, such that the instructions executed by the processors of the computer or other programmable data processing devices produce means for implementing the functions specified in one flow Figure 1 one flow or multiple flows and / or blocks Figure 1 or multiple blocks.

[0240] These computer program instructions can 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, such that the instructions stored in the computer-readable memory produce a manufactured article including instruction means that implement the functions specified in one flow Figure 1 one flow or multiple flows and / or blocks Figure 1 or multiple blocks.

[0241] These computer program instructions can also be loaded onto a computer or other programmable data processing device, such that a series of operation steps are executed on the computer or other programmable device to produce a computer-implemented process, and thus the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one flow Figure 1 one flow or multiple flows and / or blocks Figure 1 or multiple blocks.

[0242] The specific embodiments described above further elaborate on the objectives, technical solutions, and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for analyzing the energy consumption of a condensing water heating air heater system, characterized in that, The method includes: Under the operating condition of the condensate water heating air heater system, obtaining the coal consumption analysis parameters under both the shutdown condition and the operating condition simultaneously. The coal consumption analysis parameters under the shutdown condition include the first boiler fuel efficiency corrected by the inlet air temperature and the first steam turbine heat consumption rate corrected by the parameters. The coal consumption analysis parameters under the operating condition include the booster pump power, the second boiler fuel efficiency corrected by the inlet air temperature, the second steam turbine heat consumption rate corrected by the parameters, the second plant power consumption rate, and the generator output power; Based on the booster pump power, the second plant power consumption rate, and the generator output power, obtaining the first plant power consumption rate under the shutdown condition of the condensate water heating air heater system; Based on the first boiler fuel efficiency, the first steam turbine heat consumption rate, and the first plant power consumption rate, obtaining the first unit power supply coal consumption under the shutdown condition of the condensate water heating air heater system; Based on the second boiler fuel efficiency, the second steam turbine heat consumption rate, and the second plant power consumption rate, obtaining the second unit power supply coal consumption under the operating condition of the condensate water heating air heater system; Based on the first unit power supply coal consumption and the second unit power supply coal consumption, obtaining the energy consumption of the condensate water heating air heater system.

2. The energy consumption analysis method of the condensation water heating air heater system according to claim 1, wherein Obtaining the first boiler fuel efficiency corrected by the inlet air temperature under the shutdown condition under the operating condition of the condensate water heating air heater system includes: Based on the test parameters under the operating condition of the condensate water heating air heater system, using the following formula to obtain the first boiler fuel efficiency corrected by the inlet air temperature under the shutdown condition: wherein, is the first boiler fuel efficiency after the inlet air temperature correction under the shutdown condition of the condensing water heater system; is the heat loss of the flue gas after the inlet air temperature correction under the shutdown condition of the condensing water heater system; q3 is the heat loss due to incomplete combustion of gas; q4 is the heat loss due to incomplete combustion of solid; q5 is the heat dissipation loss; is the sensible heat loss of the ash residue after the inlet air temperature correction under the shutdown condition of the condensing water heater system; q 0th is other losses; is the percentage of the external heat to the lower calorific value of the fuel after the inlet air temperature correction under the shutdown condition of the condensing water heater system.

3. The energy consumption analysis method of the condensing water heating air heater system according to claim 1, characterized in that, Obtaining the first steam turbine heat consumption rate corrected by the parameters under the shutdown condition under the operating condition of the condensate water heating air heater system includes: Based on the test parameters under the operating condition of the condensate water heating air heater system, using the following formula to obtain the first steam turbine heat consumption rate corrected by the parameters under the shutdown condition: Among them, H' is the turbine heat rate under the shutdown condition of the condensate water heater system; is the first turbine heat rate after parameter correction under the shutdown condition of the condensate water heater system; C is the correction coefficient of the turbine heat rate; q m1 is the superheated steam flow rate; h1 is the enthalpy of superheated steam; q m3 is the hot reheat steam flow rate; h3 is the enthalpy of hot reheat steam; q m11 is the boiler feed water flow rate; h 11 is the enthalpy of boiler feed water; q m2 is the high-pressure extraction steam flow rate; h2 is the enthalpy of high-pressure extraction steam; q mis is the attemperating water flow rate for superheated steam; h is is the enthalpy of attemperating water for superheated steam; q mir is the attemperating water flow rate for reheated steam; h ir is the enthalpy of attemperating water for reheated steam; q m4 is the condensate water flow rate in the condensate water heater; h4 is the enthalpy of the condensate water from the outlet of the low-pressure heater to the condensate water heater; h5 is the enthalpy of the condensate water returned from the condensate water heater to the inlet of the low-pressure heater; P is the generator output power under the operating condition of the condensate water heater system.

4. The energy consumption analysis method of the condensing water heating air heater system according to claim 1, wherein, Obtaining the second boiler fuel efficiency corrected by the inlet air temperature under the operating condition under the operating condition of the condensate water heating air heater system includes: Based on the test parameters under the operating condition of the condensate water heating air heater system, using the following formula to obtain the second boiler fuel efficiency corrected by the inlet air temperature under the operating condition: Among them, is the second boiler fuel efficiency after the inlet air temperature correction under the operating conditions of the condensate water heater system; is the heat loss of the flue gas after the inlet air temperature correction under the operating conditions of the condensate water heater system; q3 is the heat loss due to incomplete combustion of gas; q4 is the heat loss due to incomplete combustion of solid; q5 is the heat dissipation loss; is the sensible heat loss of ash and slag after the inlet air temperature correction under the operating conditions of the condensate water heater system; q 0th is other losses; is the percentage of the external heat to the low calorific value of fuel after the inlet air temperature correction under the operating conditions of the condensate water heater system.

5. The energy consumption analysis method of the condensing water heating air heater system according to claim 1, wherein Obtaining the second steam turbine heat consumption rate corrected by the parameters under the operating condition under the operating condition of the condensate water heating air heater system includes: Based on the test parameters under the operating condition of the condensate water heating air heater system, using the following formula to obtain the second steam turbine heat consumption rate corrected by the parameters under the operating condition: Among them, H” is the turbine heat rate under the operating condition of the condensate water heating air heater system; is the second turbine heat rate after parameter correction under the operating condition of the condensate water heating air heater system; C is the correction coefficient of the turbine heat rate; q m1 is the superheated steam flow rate; h1 is the enthalpy of superheated steam; q m3 is the hot reheat steam flow rate; h3 is the enthalpy of hot reheat steam; q m11 is the boiler feed water flow rate; h 11 is the enthalpy of boiler feed water; q m2 is the high-pressure extraction steam flow rate; h2 is the enthalpy of high-pressure extraction steam; q mis is the attemperating water flow rate for superheat; h is is the enthalpy of attemperating water for superheat; q mir is the attemperating water flow rate for reheat; h ir is the enthalpy of attemperating water for reheat; P is the generator output power under the operating condition of the condensate water heating air heater system.

6. The energy consumption analysis method of the condensing water heating and air heater system according to claim 1, characterized in that The obtaining the first plant power consumption rate under the shutdown condition of the condensate water heating air heater system based on the booster pump power, the second plant power consumption rate, and the generator output power includes: Based on the booster pump power, the second plant power consumption rate, and the generator output power, using the following formula to obtain the first plant power consumption rate under the shutdown condition of the condensate water heating air heater system: Among them, L' is the first plant power consumption rate under the shutdown condition of the condensing water heating air heater system; L'' is the second plant power consumption rate; P b is the power of the booster pump; P is the output power of the generator.

7. The energy consumption analysis method of the condensation water heating air heater system according to claim 1, characterized in that The obtaining the first unit power supply coal consumption under the shutdown condition of the condensate water heating air heater system based on the first boiler fuel efficiency, the first steam turbine heat consumption rate, and the first plant power consumption rate includes: Based on the first boiler fuel efficiency, the first steam turbine heat consumption rate, and the first plant power consumption rate, using the following formula to obtain the first unit power supply coal consumption under the shutdown condition of the condensate water heating air heater system: wherein, b' is the power supply coal consumption of the first unit under the shutdown condition of the condensing water heating air heater system; is the heat consumption rate of the first steam turbine; is the fuel efficiency of the first boiler; η p is the system pipeline efficiency; L' is the first plant electricity consumption rate.

8. The energy consumption analysis method of the condensing water heating air heater system according to claim 1, characterized in that, Obtaining the power supply coal consumption of the second unit under the operating condition of the condensate water heater system based on the second boiler fuel efficiency, the second steam turbine heat consumption rate, and the second plant power consumption rate includes: Based on the second boiler fuel efficiency, the second steam turbine heat consumption rate, and the second plant power consumption rate, the power supply coal consumption of the second unit under the operating condition of the condensate water heater system is obtained by using the following formula: Among them, b” is the power supply coal consumption of the second unit under the operating conditions of the condensing water heating air heater system; is the heat consumption rate of the second steam turbine; is the fuel efficiency of the second boiler; η p is the system pipeline efficiency; L” is the second plant power consumption rate.

9. The energy consumption analysis method of the condensing water heating air heater system according to claim 1, characterized in that, Obtaining the energy consumption of the condensate water heater system based on the power supply coal consumption of the first unit and the power supply coal consumption of the second unit includes: Based on the power supply coal consumption of the first unit and the power supply coal consumption of the second unit, the energy consumption of the condensate water heater system is obtained by using the following formula: Δb = b'' - b'; Where, Δb is the energy consumption of the condensate water heater system; b' is the power supply coal consumption of the first unit; b'' is the power supply coal consumption of the second unit.

10. An energy consumption analysis device for a condensing water heating air heater system, characterized in that, The device includes: A parameter acquisition unit, configured to simultaneously acquire coal consumption analysis parameters under the shutdown condition and the operating condition under the operating condition of the condensate water heater system. The coal consumption analysis parameters under the shutdown condition include the first boiler fuel efficiency after inlet air temperature correction and the first steam turbine heat consumption rate after parameter correction. The coal consumption analysis parameters under the operating condition include the booster pump power, the second boiler fuel efficiency after inlet air temperature correction, the second steam turbine heat consumption rate after parameter correction, the second plant power consumption rate, and the generator output power; A plant power consumption rate acquisition unit, configured to obtain the first plant power consumption rate under the shutdown condition of the condensate water heater system based on the booster pump power, the second plant power consumption rate, and the generator output power; A first power supply coal consumption acquisition unit, configured to obtain the power supply coal consumption of the first unit under the shutdown condition of the condensate water heater system based on the first boiler fuel efficiency, the first steam turbine heat consumption rate, and the first plant power consumption rate; A second power supply coal consumption acquisition unit, configured to obtain the power supply coal consumption of the second unit under the operating condition of the condensate water heater system based on the second boiler fuel efficiency, the second steam turbine heat consumption rate, and the second plant power consumption rate; An energy consumption acquisition unit, configured to obtain the energy consumption of the condensate water heater system based on the power supply coal consumption of the first unit and the power supply coal consumption of the second unit.

11. An electronic device, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, When the processor executes the computer program, the steps of the method according to any one of claims 1-9 are implemented.

12. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, the steps of the method according to any one of claims 1-9 are implemented.

13. A computer program product comprising a computer program / instructions, characterized in that, When the computer program / instructions are executed by the processor, the steps of the method according to any one of claims 1 to 9 are implemented.

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