Efficiency measuring and calculating method and system for ammonia-doped combustion boiler of coal-fired unit and storage medium

Abstract

The invention discloses a coal-fired unit ammonia-doped combustion boiler efficiency measuring and calculating method and system and a storage medium, and the method comprises the steps: sampling and analyzing physical parameters of as-fired coal, as-fired ammonia fuel, fly ash and slag, and synchronously measuring boiler-side physical parameters and steam turbine-side physical parameters; calculating boiler output effective energy according to the steam turbine side physical parameters; according to the assumed value of boiler efficiency, boiler output effective energy and boiler side physical parameters, the ammonia doping mass ratio is calculated according to the energy conservation principle; according to the ammonia doping mass ratio, the calculation value of the boiler efficiency is calculated through an anti-balance method; comparing the calculated value of the boiler efficiency with the assumed value of the boiler efficiency, judging whether an iteration termination condition is met or not, if not, replacing the assumed value of the boiler efficiency with the calculated value of the boiler efficiency to recalculate the ammonia doping mass ratio and the calculated value of the boiler efficiency, and if yes, taking the calculated value of the boiler efficiency as the actual value of the boiler efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of performance test of ammonia-doped combustion boiler of coal-fired unit, and in particular to a method and system for calculating the efficiency of ammonia-doped combustion boiler of coal-fired unit and a storage medium. BACKGROUND

[0002] With the continuous advancement of the "double carbon" goal, the structure of the power system is transforming from a high proportion of traditional coal-fired units to a new energy power generation dominated structure. Due to the volatility, intermittency and randomness of new energy power generation, coal-fired units gradually become the stability guarantee power and regulating power of the power system. Despite this, coal-fired units still face great pressure to save energy and reduce carbon. Ammonia, as a fuel, mainly generates nitrogen and water after combustion, and its mixed combustion with coal can reduce carbon emissions. Ammonia-doped combustion of coal-fired units is considered an effective technical path to reduce carbon emissions and has attracted widespread attention.

[0003] However, ammonia-doped combustion of coal-fired units will change the combustion characteristics of the boiler furnace, such as flame temperature, combustion stability, heat transfer process, and flue gas composition, which directly affect the boiler efficiency. Accurate calculation of the efficiency of ammonia-doped combustion boiler of coal-fired units is a key prerequisite for evaluating the feasibility of the technology, optimizing the combustion conditions, and ensuring the economic operation of the unit. The traditional boiler efficiency calculation, such as the patent application with publication number CN116720028A, proposes to use the empirical formula or coefficient of wind-coal ratio, low calorific value of coal, and oxygen content of flue gas to approximately calculate the carbon burnout rate, flue gas volume, etc., to achieve online measurement. The principle of boiler efficiency calculation is essentially the heat loss method (reverse balance method). These traditional boiler efficiency calculations use the reverse balance method and mainly target pure coal combustion without fully considering the special effects of ammonia-doped combustion of coal-fired units, such as the unknown value of ammonia-doped ratio, the interference of unburned ammonia in ammonia combustion products on heat loss calculation, and the change in flue gas composition. Therefore, to adapt to the development of ammonia-doped combustion technology of coal-fired units, it is urgent to define a specific boiler efficiency calculation method to solve the problem of insufficient applicability of traditional methods in this scenario and provide reliable energy efficiency evaluation basis for the engineering application of ammonia-doped combustion technology.

[0004] In related technologies, the document "Influence Analysis of Ammonia-Coal Mixed Combustion on Calculation Deviation of Power Station Boiler Efficiency", Liu Xumen et al., Coal Conversion Network First Published Paper", addresses the technical problem of calculation deviation caused by ignoring the influence of nitrogen content in the fuel in the calculation formula of GB / T 10184-2025 Power Station Boiler Performance Test Procedure, and proposes a calculation method for excess air coefficient applicable to ammonia-coal mixed combustion, achieving the effect of calculation results not being affected by nitrogen content, but cannot simultaneously calculate the accurate ammonia-doped ratio and boiler efficiency. SUMMARY

[0005] The technical problem to be solved by the present application is how to realize the calculation of the efficiency of the ammonia-doped combustion boiler of a coal-fired unit.

[0006] The present application solves the above technical problem by the following technical means: The present application provides a method for calculating the efficiency of an ammonia-doped combustion boiler of a coal-fired unit, which comprises the following steps: The physical parameters of the coal, the ammonia fuel, the fly ash and the slag are sampled and analyzed, and the physical parameters on the boiler side and the physical parameters on the steam turbine side are synchronously measured; The effective energy output of the boiler is calculated according to the physical parameters on the steam turbine side; The ammonia-doped mass ratio is calculated according to the assumed value of the boiler efficiency, the effective energy output of the boiler and the physical parameters on the boiler side by using the energy conservation principle; The calculated value of the boiler efficiency is obtained by using the anti-balance method according to the ammonia-doped mass ratio; The calculated value of the boiler efficiency is compared with the assumed value of the boiler efficiency, and it is judged whether the iteration termination condition is met, if not, the ammonia-doped mass ratio and the calculated value of the boiler efficiency are recalculated by replacing the assumed value of the boiler efficiency with the calculated value of the boiler efficiency, and if yes, the calculated value of the boiler efficiency is taken as the actual value of the boiler efficiency.

[0007] Further, the sampling and analysis of the physical parameters of the coal, the ammonia fuel, the fly ash and the slag, and the synchronous measurement of the physical parameters on the boiler side and the physical parameters on the steam turbine side comprise: The physical parameters of the coal include the moisture content Mt, the ash content A ar , the volatile content V ar , the carbon content C ar , the hydrogen content H ar , the oxygen content O ar , the nitrogen content N ar , the sulfur content S ar and the low calorific value Q net,ar of the coal (received basis); The physical parameters of the ammonia fuel include the purity and the low calorific value ; The physical parameters of the fly ash and the slag include the mass fraction of carbon C fh in the fly ash and the mass fraction of carbon C lz in the slag; The physical parameters on the boiler side include the mass flow of the ammonia fuel , the flue gas temperature t py , the volume fraction of NH3 in the flue gas components at the outlet of the economizer , the volume fraction of O2 in the flue gas components at the outlet of the air preheater , the volume fraction of CO X CO , the ambient temperature t0, the relative humidity of air and the atmospheric pressure P0; The physical parameters of the turbine side include first physical parameters of the turbine side obtained by using the direct measurement method of the main feed water flow and second physical parameters of the turbine side obtained by using the reference measurement method of the condensate water flow.

[0008] Further, the effective energy of the boiler output is calculated according to the physical parameters of the turbine side, and the formula is:

[0009] In the formula, is the effective energy of the boiler output, is the main feed water flow, is the superheating desuperheating water flow, is the cold re-steam flow, is the reheating desuperheating water flow, is the main steam enthalpy, is the main feed water enthalpy, is the superheating desuperheating water enthalpy, is the hot reheating steam enthalpy, is the cold reheating steam enthalpy, is the reheating desuperheating water enthalpy; If the direct measurement method of the main feed water flow is used, the main feed water flow is directly measured, and if the reference measurement method of the condensate water flow is used, the formula for calculating the main feed water flow is:

[0010] In the formula, is the main condensate water flow, is the equivalent flow of the deaerator water level change, , , h1, h2, h3 and h4 are respectively the 1st high pressure heater, 2nd high pressure heater, 3rd high pressure heater and deaerator inlet steam enthalpy, h d1 , h d2 , h d3 are respectively the 1st high pressure heater, 2nd high pressure heater and 3rd high pressure heater drain enthalpy, h f0 , h f1 are respectively the 1st high pressure heater outlet and inlet enthalpy, h f2 , h f3 are respectively the 2nd and 3rd high pressure heater inlet enthalpy, h f4 , h f5 are respectively the deaerator outlet and inlet enthalpy, and a, b and c are respectively the ratio of the 1st high pressure heater steam flow G1 to the main feed water flow G fw , the ratio of the 2nd high pressure heater steam flow G2 to the main feed water flow G fw , and the ratio of the 3rd high pressure heater steam flow G3 to the main feed water flow G fw .

[0011] Further, the ammonia-doped mass ratio is calculated according to the assumed value of the boiler efficiency, the effective energy of the boiler output and the physical parameters of the boiler side, and the formula is expressed as:

[0012] In the formula, is the ammonia-doped mass ratio, is the mass flow of the ammonia fuel into the furnace, is the effective energy of the boiler output, is the assumed value of the boiler efficiency, is the low calorific value of the ammonia fuel into the furnace, is the low calorific value of the coal into the furnace.

[0013] Further, the calculated value of the boiler efficiency is obtained according to the ammonia-doped mass ratio by using the anti-balance method, which includes: the carbon actually combusted by the coal into the furnace is calculated according to the physical parameters of the coal into the furnace, the physical parameters of the fly ash and the slag; the dry air volume into the boiler combusted by unit mass of the fuel, the dry flue gas volume generated by unit mass of the fuel and the water vapor volume generated by unit mass of the fuel are calculated based on the ammonia-doped mass ratio, the carbon actually combusted by the coal into the furnace and the physical parameters of the coal into the furnace; the flue gas heat loss is calculated based on the ammonia-doped mass ratio, the dry flue gas volume generated by unit mass of the fuel, the water vapor volume generated by unit mass of the fuel and the corresponding average constant-pressure specific heat capacity; the gas incomplete combustion loss, the solid incomplete combustion loss and the ash and slag physical heat loss are calculated by considering the ammonia-doped mass ratio; the percentage of the external heat and the low calorific value of the fuel is calculated by considering the ambient temperature, the ammonia-doped mass ratio, the average specific heat of the fuel, the dry air volume into the boiler combusted by unit mass of the fuel, the water vapor volume in the air and the corresponding average constant-pressure specific heat capacity; the calculated value of the boiler efficiency is obtained based on the flue gas heat loss, the gas incomplete combustion loss, the solid incomplete combustion loss, the ash and slag physical heat loss, the percentage of the external heat and the low calorific value of the fuel, the boiler heat loss and other heat losses.

[0014] Further, the dry air volume into the boiler combusted by unit mass of the fuel, the dry flue gas volume generated by unit mass of the fuel and the water vapor volume generated by unit mass of the fuel are calculated based on the ammonia-doped mass ratio, the carbon actually combusted by the coal into the furnace and the physical parameters of the coal into the furnace, which includes: the dry air volume into the boiler combusted by unit mass of the fuel is calculated based on the ammonia-doped mass ratio, the carbon actually combusted by the coal into the furnace, the volume fraction of O2 in the flue gas component at the outlet of the air preheater and the components of hydrogen, oxygen, nitrogen and sulfur in the coal (received base) into the furnace, and the formula is expressed as:

[0015] wherein, Vdry is the dry air volume combusted per unit mass of fuel into the boiler, Cactual is the actual carbon combusted in the coal fed into the boiler, Ncoal is the nitrogen in the coal fed into the boiler (as-received basis), O2,pre is the volume fraction of O2 in the flue gas at the exit of the pre- heater, Hcoal is the hydrogen in the coal fed into the boiler (as-received basis), Ocoal is the oxygen in the coal fed into the boiler (as-received basis), Scoal is the sulfur in the coal fed into the boiler (as-received basis); based on the ammonia blending mass ratio, the dry air volume combusted per unit mass of fuel into the boiler, and the hydrogen, oxygen, and nitrogen in the coal fed into the boiler (as-received basis), the dry flue gas volume generated by combusting a unit mass of fuel is calculated, and is expressed by the formula:

[0016] wherein, Vdry is the dry flue gas volume generated by combusting a unit mass of fuel; based on the ammonia blending mass ratio, the dry air volume combusted per unit mass of fuel into the boiler, the hydrogen in the coal fed into the boiler (as-received basis), and the environmental parameters, the water vapor volume generated by combusting a unit mass of fuel is calculated, and is expressed by the formula:

[0017]

[0018]

[0019]

[0020] wherein, Vwater is the water vapor volume generated by combusting a unit mass of fuel, Vwater,air is the water vapor volume in the air combusted per unit mass of fuel into the boiler, Vwater,coal is the water vapor volume formed by the moisture in the coal per unit mass of fuel, Vwater,H is the water vapor volume generated by the hydrogen element per unit mass of fuel, RH is the relative humidity of the air, Pwater is the saturated pressure of water vapor in the air at the atmospheric temperature, Patm is the atmospheric pressure, Wcoal is the moisture in the coal fed into the boiler (as-received basis).

[0021] Further, the actual carbon combusted in the coal fed into the boiler is calculated according to the physical parameters of the coal fed into the boiler, the physical parameters of the fly ash and the slag, and is expressed by the formula:

[0022] Cin is the actual carbon burned in the coal fed to the furnace, Cin is the actual carbon burned in the coal fed to the furnace, Cin is the actual carbon burned in the coal fed to the furnace, Cin is the actual carbon burned in the coal fed to the furnace, Cin is the actual carbon burned in the coal fed to the furnace, Cin is the actual carbon burned in the coal fed to the furnace, Cin is the actual carbon burned in the coal fed to the furnace, Cin is the actual carbon burned in the coal fed to the furnace.

[0023] Further, the formula for calculating the heat loss of flue gas is:

[0024] Cin is the actual carbon burned in the coal fed to the furnace, Cin is the actual carbon burned in the coal fed to the furnace, Cin is the actual carbon burned in the coal fed to the furnace, Cin is the actual carbon burned in the coal fed to the furnace, Cin is the actual carbon burned in the coal fed to the furnace. Cin is the actual carbon burned in the coal fed to the furnace.

[0025] Further, the formula for calculating the heat loss of flue gas is: Cin is the actual carbon burned in the coal fed to the furnace,

[0026] Cin is the actual carbon burned in the coal fed to the furnace, Cin is the actual carbon burned in the coal fed to the furnace, Cin is the actual carbon burned in the coal fed to the furnace, Cin is the actual carbon burned in the coal fed to the furnace; Cin is the actual carbon burned in the coal fed to the furnace,

[0027] Cin is the actual carbon burned in the coal fed to the furnace, Cin is the actual carbon burned in the coal fed to the furnace; Cin is the actual carbon burned in the coal fed to the furnace,

[0028] Cin is the actual carbon burned in the coal fed to the furnace, Cin is the actual carbon burned in the coal fed to the furnace, Cin is the actual carbon burned in the coal fed to the furnace, Cin is the actual carbon burned in the coal fed to the furnace, Cin is the actual carbon burned in the coal fed to the furnace, Tf is the temperature of the slag from 25 °C to the slag temperature at the boundary of the boiler system Cp is the average specific heat, Tf is the temperature of the slag at the boundary of the boiler system.

[0029] Further, the percentage of the external heat to the low heat value of the fuel is calculated based on the ambient temperature, the mass ratio of the ammonia mixed, the average specific heat of the fuel, the dry air volume and the water vapor volume in the air per unit mass of the fuel entering the boiler, and the corresponding average constant pressure specific heat capacity, and is expressed by the formula:

[0030] In the formula, the percentage of the external heat to the low heat value of the fuel, Tf is the temperature of the coal entering the boiler system from 25 °C to the coal temperature at the boundary of the boiler system Cp is the average specific heat, Tf is the temperature of the coal at the boundary of the boiler system, Tf is the temperature of the ammonia fuel entering the boiler system from 25 °C to the ammonia fuel temperature at the boundary of the boiler system Cp is the average constant pressure specific heat capacity, Tf is the temperature of the ammonia fuel at the boundary of the boiler system, Tf is the temperature of the dry air from 25 °C to the air temperature at the boundary of the boiler system Cp is the average constant pressure specific heat capacity, Tf is the temperature of the air at the boundary of the boiler system, Tf is the temperature of the water vapor in the air from 25 °C to the air temperature at the boundary of the boiler system Cp is the average constant pressure specific heat capacity.

[0031] Further, the calculated value of the boiler efficiency is obtained based on the heat loss of the exhaust smoke, the incomplete combustion loss of the gas, the incomplete combustion loss of the solid, the physical heat loss of the ash and slag, the percentage of the external heat to the low heat value of the fuel, the heat loss of the boiler, and other heat losses, and is expressed by the formula:

[0032] In the formula, the calculated value of the boiler efficiency, the heat loss of the exhaust smoke, the incomplete combustion loss of the gas, the incomplete combustion loss of the solid, the heat loss of the boiler, the physical heat loss of the ash and slag, other heat losses, the percentage of the external heat to the low heat value of the fuel.

[0033] Further, the calculated value of the boiler efficiency is compared with the assumed value of the boiler efficiency, and it is determined whether the iteration termination condition is met, comprising: The calculated value of the boiler efficiency η s is compared with the assumed value of the boiler efficiency η js , and it is determined whether the iteration termination condition is met. s -η js <=0.01%. If yes, the iteration termination condition is met, and if no, the iteration termination condition is not met.

[0034] In addition, the present application also provides a coal-fired unit ammonia-doped combustion boiler efficiency calculation system, which comprises: A parameter analysis module is configured to sample and analyze the physical parameters of the coal entering the furnace, the ammonia fuel entering the furnace, and the fly ash and slag, and simultaneously measure the physical parameters on the boiler side and the physical parameters on the steam turbine side. An effective energy calculation module is configured to calculate the effective energy output by the boiler according to the physical parameters on the steam turbine side. An ammonia-doped mass ratio calculation module is configured to calculate the ammonia-doped mass ratio according to the assumed value of the boiler efficiency, the effective energy output by the boiler, and the physical parameters on the boiler side, and utilize the principle of energy conservation. A boiler efficiency calculation module is configured to calculate the actual value of the boiler efficiency by using the back-balance method according to the ammonia-doped mass ratio. An iteration module is configured to compare the calculated value of the boiler efficiency with the assumed value of the boiler efficiency, and determine whether the iteration termination condition is met, if not, replace the assumed value of the boiler efficiency with the calculated value of the boiler efficiency to recalculate the ammonia-doped mass ratio and the calculated value of the boiler efficiency, and if yes, take the calculated value of the boiler efficiency as the actual value of the boiler efficiency.

[0035] In addition, the present application also provides a computer readable storage medium having a computer program stored thereon, wherein the computer program is executed by a processor to implement the coal-fired unit ammonia-doped combustion boiler efficiency calculation method.

[0036] The present application has the following advantages: (1) Because there is a close interrelation and mutual influence between the two physical quantities of the ammonia-doped combustion boiler efficiency of the coal-fired unit and the ammonia-doping mass ratio, the two are coupled, and the target of the test is to accurately measure the boiler efficiency, which leads to the fact that in the actual field, the ammonia-doping ratio cannot be accurately controlled according to the electric load or the coal supply amount and the ammonia fuel mass flow under the condition that the boiler efficiency is unknown, the ammonia-doping mass ratio of the test operation condition is affected by the boiler efficiency, and the boiler efficiency changes with the change of the ammonia-doping mass ratio. Therefore, the present application proposes an iterative calculation method based on the principle of energy conservation combined with the accurately measured data of the test, determines the ammonia-doping mass ratio according to the energy conservation based on the assumed boiler efficiency, and obtains the calculated value of the boiler efficiency based on the ammonia-doping mass ratio by using the counterbalance method. The calculated value of the boiler efficiency is compared with the assumed value of the boiler efficiency, and it is judged whether the iteration termination condition is met. If not, the calculated value of the boiler efficiency is used to replace the assumed value of the boiler efficiency to recalculate the ammonia-doping mass ratio and the calculated value of the boiler efficiency. If yes, the calculated value of the boiler efficiency is taken as the actual value of the boiler efficiency. Therefore, the accurate ammonia-doping ratio and boiler efficiency can be obtained through the iterative algorithm, and the problem of inaccurate control of the ammonia-doping ratio is solved.

[0037] (2) The ammonia-doped combustion of the coal-fired unit will change the combustion characteristics of the boiler furnace, such as flame temperature, combustion stability, heat transfer process and flue gas composition, which directly affects the boiler efficiency. The calculation formula of GB / T 10184-2025 Performance Test Code for Utility Boilers does not consider the influence of fuel nitrogen when converting fuel ammonia to coal according to the mass ratio, and there is deviation in the air volume, flue gas volume and flue gas composition calculated according to the air excess coefficient. Therefore, the present application avoids the excess air coefficient and deduces the formula for calculating the air volume, flue gas volume and flue gas composition from the chemical reaction equation, solving the problem of unsuitable calculation formula of GB / T 10184-2025 Performance Test Code for Utility Boilers.

[0038] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0039] The accompanying drawings, which constitute a part of this specification, are included to provide a further understanding of the present application, and are incorporated herein by reference. The embodiments of the present application, together with its details, are shown and described in conjunction with the drawings Fig. 1 is a flowchart of a coal-fired unit ammonia-doped combustion boiler efficiency measurement method according to an embodiment of the present application; Fig. 2 is a whole principle flowchart of a coal-fired unit ammonia-doped combustion boiler efficiency measurement method according to an embodiment of the present application; Fig. 3It is a structural schematic diagram of a coal-fired unit ammonia-doped combustion boiler efficiency measuring and calculating system according to an embodiment of the present application. DETAILED DESCRIPTION

[0040] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described below in a clear and complete manner in conjunction with the embodiments of the present application. Obviously, the described embodiments are only some, but not all, of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0041] As shown in Figs. 1-2 The present application provides a coal-fired unit ammonia-doped combustion boiler efficiency measuring and calculating method according to a first embodiment of the present application, which comprises the following steps: S10, sampling and analyzing the physical parameters of the coal entering the furnace, the ammonia fuel entering the furnace, and the fly ash and slag, and synchronously measuring the physical parameters on the boiler side and the physical parameters on the steam turbine side; S20, calculating the effective energy output by the boiler according to the physical parameters on the steam turbine side; S30, calculating the ammonia-doping mass ratio by using the energy conservation principle according to the assumed value of the boiler efficiency, the effective energy output by the boiler, and the physical parameters on the boiler side; S40, calculating the calculated value of the boiler efficiency by using the counter-balance method according to the ammonia-doping mass ratio; S50, comparing the calculated value of the boiler efficiency with the assumed value of the boiler efficiency, judging whether the iteration termination condition is met, if not, recalculating the ammonia-doping mass ratio and the calculated value of the boiler efficiency by replacing the assumed value of the boiler efficiency with the calculated value of the boiler efficiency, and if yes, taking the calculated value of the boiler efficiency as the actual value of the boiler efficiency.

[0042] The present embodiment aims at the technical problems that the ammonia-doping ratio (energy ratio) cannot be accurately controlled in the efficiency test of the coal-fired unit ammonia-doped combustion boiler, and the calculation formula in GB / T 10184-2025 Performance Test Code for Utility Boilers is not applicable. According to the mixing combustion reaction chemical equation, a calculation formula is derived. Considering that the boiler efficiency and the ammonia-doping ratio are coupled, and the boiler efficiency is the test target, the ammonia-doping ratio cannot be accurately controlled in the actual test site. An iterative calculation method based on the energy conservation principle is proposed to combine the accurately measured data in the test, so as to calculate the accurate ammonia-doping ratio and the boiler efficiency, and achieve the purpose of accurately evaluating the ammonia-doped combustion boiler efficiency by the test method.

[0043] As a further preferred technical solution, the step S10: sampling and analyzing the physical parameters of the coal entering the furnace, the ammonia fuel entering the furnace, and the fly ash and slag, and synchronously measuring the physical parameters on the boiler side and the physical parameters on the steam turbine side, specifically comprises the following steps: S11, The physical parameters of the coal fed into the furnace include the moisture content Mt and ash content A in the coal fed into the furnace (on a received basis). ar volatile matter V ar Carbon C ar Hydrogen H ar Oxygen ar Nitrogen N ar Sulfur S ar and low heating value Q net,ar ; S12, The physical parameters of the ammonia fuel fed into the furnace include purity and lower heating value. ; S13, The physical parameters of the fly ash and slag include the carbon mass fraction C in the fly ash. fh and the carbon mass fraction C in slag lz ; S14. The boiler-side physical parameters include the mass flow rate of ammonia fuel entering the furnace. Smoke exhaust temperature t py Volume fraction of NH3 in the flue gas composition at the economizer outlet The volume fraction of O2 in the flue gas at the air preheater outlet is Volume fraction of CO X CO Ambient temperature t0, relative humidity and atmospheric pressure P0; S15. The turbine-side physical parameters include the first turbine-side physical parameters obtained by direct measurement of main feedwater flow rate and the second turbine-side physical parameters obtained by reference measurement of condensate flow rate.

[0044] Specifically, if the main feedwater flow rate is directly measured, the turbine-side physical parameters include the main steam temperature t. ms Pressure P ms hot reheat steam temperature t hrh Pressure P hrh Cold resteam temperature t crh Pressure P crh Water flow rate G fw Temperature t fw and pressure P fw Superheated desuperheating water flow rate G sdw Temperature t sdw and pressure P sdw Reheating and cooling water flow rate G rdw Temperature t rdw and pressure P rdw Steam inlet temperature t1, pressure P1, and condensate temperature t of No. 1 high-pressure heater. d1 Pressure P d1 Inlet water temperature t f1 Pressure P f1 Outlet water temperature tf0 , pressure P f0 , pressure P2, drain temperature t d2 , pressure P d2 , pressure P f2 , pressure P f2 .

[0045] If the condensate flow reference measurement method is used, the physical parameters on the steam turbine side include main steam temperature t ms , pressure P ms , pressure P hrh , pressure P hrh , pressure P crh , pressure P crh , pressure P fw , pressure P fw , pressure P sdw , pressure P sdw , pressure P sdw , pressure P rdw , pressure P rdw , pressure P rdw , pressure P1, drain temperature t d1 , pressure P d1 , pressure P f1 , pressure P f1 , pressure P f0 , pressure P f0 , pressure P2, drain temperature t d2 , pressure P d2 , pressure P f2 , pressure P f2 , pressure P3, drain temperature t d3 , pressure P d3 , pressure P f3 , pressure P f3 , pressure P4, drain temperature t f5 , pressure P f5 , pressure P f4 , pressure P f4 , pressure P c , pressure P dl .

[0046] As a further preferred technical solution, the step S20 of calculating the effective energy output by the boiler according to the physical parameters on the steam turbine side is expressed by the following formula:

[0047] In the formula, is the effective energy output of the boiler, is the main feedwater flow rate, is the superheated desuperheating water flow rate, is the cold reheat steam flow rate, is the reheated desuperheating water flow rate, is the main steam enthalpy, is the main feedwater enthalpy, is the superheated desuperheating water enthalpy, is the hot reheat steam enthalpy, is the cold reheat steam enthalpy, is the reheated desuperheating water enthalpy; wherein, if the main feedwater flow rate is directly measured, the main feedwater flow rate is directly measured, and if the condensed water flow rate is measured as a reference, the calculation formula of the main feedwater flow rate is:

[0048] wherein, is the main condensed water flow rate, is the deaerator water level change equivalent flow rate, , , .

[0049] wherein, the calculation formula of the cold reheat steam flow rate is:

[0050] wherein, h1, h2, h3, and h4 are the 1st high-pressure heater, 2nd high-pressure heater, 3rd high-pressure heater, and deaerator inlet steam enthalpy, respectively, which are obtained according to the inlet steam temperature and pressure (t1, P1), (t2, P2), (t3, P3), and (t4, P4) of the 1st high-pressure heater, 2nd high-pressure heater, 3rd high-pressure heater, and deaerator by table lookup or formula calculation; h d1 , h d2 , and h d3 are the 1st high-pressure heater, 2nd high-pressure heater, and 3rd high-pressure heater drain enthalpy, respectively, which are obtained according to the drain temperature and pressure (t d1 , P d1 ), (t d2 , P d2 ), and (t d3 , P d3 ) of the 1st high-pressure heater, 2nd high-pressure heater, and 3rd high-pressure heater by table lookup or formula calculation; h f0 , h f1 are the 1st high-pressure heater outlet and inlet enthalpy, respectively, which are obtained according to the outlet and inlet temperature and pressure (t f0 , P f0 ), (t f1 , P f1 ) of the 1st high-pressure heater by table lookup or formula calculation; hf2 h f3 The enthalpy of the inlet water for high-pressure heaters No. 2 and No. 3 are respectively determined based on the inlet water temperature and pressure (t) of high-pressure heaters No. 2 and No. 3. f2 ,P f2 ), (t f3 ,P f3 Obtained by referring to a table or calculating using a formula; h f4 h f5 These are the enthalpy of the deaerator outlet water and inlet water, respectively, based on the deaerator outlet water and inlet water temperature and pressure (t). f4 ,P f4 ), (t f5 ,P f5 (This can be obtained by referring to tables or calculating using formulas; a, b, and c are the steam inlet flow rate G1 and the main feedwater flow rate G1 of No. 1 high-pressure heater, respectively.) fw The ratio of the No. 2 high-pressure steam inlet flow rate G2 to the main feedwater flow rate G fw The ratio of the No. 3 high-pressure steam inlet flow rate G3 to the main feedwater flow rate G fw The ratio of .

[0051] h ms The main steam enthalpy, based on the main steam temperature and pressure (t) ms ,P ms (h) Obtained by looking up a table or calculating using a formula; fw The enthalpy of the main feedwater is determined based on the temperature and pressure of the main feedwater (t). fw ,P fw G can be obtained by looking up a table or calculating using a formula. sdw To reduce the overheating and desuperheating water flow rate, when the main feedwater flow rate G fw Including superheated desuperheating water flow rate G sdw (For example, for units of 600MW and above), the superheated desuperheating water flow rate is equal to 0; when the main feedwater flow rate G fw Excluding superheated desuperheating water flow rate G sdw (For example, in units of 300MW and below), the superheated desuperheating water flow rate is directly measured by an orifice plate flow meter; h sdw The enthalpy of the superheated desuperheating water is determined based on the temperature and pressure (t) of the superheated desuperheating water. fw ,P fw G can be obtained by looking up a table or calculating using a formula. a The leakage rate of the high-pressure cylinder valve stem and shaft seal is determined based on leakage test or design values ​​and is proportional to the main steam flow rate. hrh The enthalpy of reheat steam is determined by the temperature and pressure of the reheat steam (t). hrh ,P hrh (h) Obtained by looking up a table or calculating using a formula; crh The enthalpy of cold reheat steam is determined by the temperature and pressure (t) of the cold reheat steam. crh ,P crh) is obtained by table lookup or by formula calculation; G rdw is obtained by direct measurement by an orifice flowmeter; h rdw is the enthalpy of the reheat desuperheating water, and is obtained according to the temperature and pressure (t rdw ,P rdw ) of the reheat desuperheating water.

[0052] It should be noted that in the calculation of the effective energy output of the boiler, the energy balance equations of the No. 1 high-pressure heater, the No. 2 high-pressure heater, the No. 3 high-pressure heater and the deaerator are solved and deduced, so that the main feed water flow rate can be directly calculated, and there is no need to solve the equation set, thereby simplifying the calculation.

[0053] As a further preferred technical solution, the step S30: according to the assumed value of the boiler efficiency, the effective energy output of the boiler and the physical parameters of the boiler side, the mass ratio of ammonia doping is calculated by using the principle of energy conservation, and the formula is represented as:

[0054] In the formula, is the mass ratio of ammonia doping, is the mass flow rate of the ammonia fuel into the furnace, is the effective energy output of the boiler, is the assumed value of the boiler efficiency, is the low calorific value of the ammonia fuel into the furnace, is the low calorific value of the coal into the furnace.

[0055] According to the assumed boiler efficiency, the mass ratio of ammonia doping is calculated according to the principle of energy conservation, which prepares for the subsequent calculation of the boiler efficiency.

[0056] As a further preferred technical solution, the step S40: the calculated value of the boiler efficiency is calculated by using the counter-balance method according to the mass ratio of ammonia doping, and specifically includes the following steps: S41, according to the physical parameters of the coal into the furnace, the physical parameters of the fly ash and the slag, the carbon actually combusted by the coal into the furnace is calculated, and the formula is represented as:

[0057] In the formula, is the carbon actually combusted by the coal into the furnace, is the carbon in the coal into the furnace (received basis), is the ash in the coal into the furnace (received basis), is the mass fraction of carbon in the fly ash; is the mass fraction of the fly ash in the total ash of the coal into the furnace, which is obtained by direct measurement or taking a design value, and is 0.9 for a pulverized coal furnace and 0.6 for a circulating fluidized bed; is the mass fraction of carbon in the slag, The mass fraction of slag in total ash of the coal entering the furnace is directly measured or a design value is taken, 0.1 for a pulverized coal furnace and 0.4 for a circulating fluidized bed.

[0058] It should be noted that the formulae of unburned carbon and actual burned carbon are combined in this embodiment, and the actual burned carbon can be directly calculated, reducing the intermediate variable unburned carbon.

[0059] S42, based on the ammonia doping mass ratio, the actual carbon burned by the coal entering the furnace, and the physical parameters of the coal entering the furnace, calculating the dry air volume entering the boiler per unit mass of fuel, the dry flue gas volume generated per unit mass of fuel, and the water vapor volume generated per unit mass of fuel; Specifically, based on the ammonia doping mass ratio, the actual carbon burned by the coal entering the furnace, the hydrogen, oxygen, nitrogen and sulfur in the coal (received basis), and the volume fraction of O2 in the flue gas component at the outlet of the air preheater, the dry air volume entering the boiler system per unit mass of fuel is calculated, and the formula is expressed as:

[0060] In the formula, is the dry air volume entering the boiler per unit mass of fuel, is the nitrogen in the coal (received basis), is the volume fraction of O2 in the flue gas component at the outlet of the air preheater, is the hydrogen in the coal (received basis), is the oxygen in the coal (received basis), is the sulfur in the coal (received basis); Based on the ammonia doping mass ratio, the dry air volume entering the boiler per unit mass of fuel, and the hydrogen, oxygen, and nitrogen in the coal (received basis), the dry flue gas volume generated per unit mass of fuel is calculated, and the formula is expressed as:

[0061] In the formula, is the dry flue gas volume generated per unit mass of fuel; In this embodiment, the volumes of actual dry air and dry flue gas are derived according to chemical reaction equations, avoiding the calculation of the volumes of actual dry air and dry flue gas through the excess air coefficient.

[0062] Based on the ammonia doping mass ratio, the dry air volume entering the boiler per unit mass of fuel, the hydrogen in the coal (received basis), and the environmental parameters, the water vapor volume generated per unit mass of fuel is calculated, and the formula is expressed as:

[0063]

[0064]

[0065]

[0066] In the formula, Vw is the volume of water vapor generated by burning unit mass of fuel, Vw is the volume of water vapor generated by burning unit mass of fuel, Vw is the volume of water vapor generated by burning unit mass of fuel, Vw is the volume of water vapor generated by burning unit mass of fuel, The relative humidity of air is obtained directly by measuring with a hygrometer; Pw is the saturated pressure of water vapor in air at atmospheric temperature, which is obtained by looking up a table or by formula calculation; Pw is the saturated pressure of water vapor in air at atmospheric temperature, which is obtained by looking up a table or by formula calculation; Pw is the saturated pressure of water vapor in air at atmospheric temperature, which is obtained by looking up a table or by formula calculation;

[0067] wherein C g,p Cp is the average constant-pressure specific heat capacity, which is obtained by the following formula: py Cp is the average constant-pressure specific heat capacity, which is obtained by the following formula:

[0068] wherein C O2,p Cp is the average constant-pressure specific heat capacity, which is obtained by the following formula: SO2,p Cp is the average constant-pressure specific heat capacity, which is obtained by the following formula: CO2,P Cp is the average constant-pressure specific heat capacity, which is obtained by the following formula: N2,p Cp is the average constant-pressure specific heat capacity, which is obtained by the following formula: py Cp is the average constant-pressure specific heat capacity, which is obtained by looking up a table or by formula calculation; C w,p Cp is the average constant-pressure specific heat capacity, which is obtained by looking up a table or by formula calculation; C py Cp is the average constant-pressure specific heat capacity, which is obtained by looking up a table or by formula calculation; C This embodiment derives the average constant-pressure specific heat capacity of dry flue gas based on the chemical reaction equation, considers the influence of ammonia combustion on flue gas components, and does not use approximate values or empirical values, thereby improving the calculation accuracy.

[0069] It should be noted that the absolute humidity formula and the mass and volume conversion formula of water vapor are combined in this embodiment, so that the volume of water vapor in the boiler air generated by burning unit mass of fuel can be directly calculated, the intermediate variables are reduced, the calculation is simplified, and the moisture generated by ammonia combustion is considered in addition to the ammonia blending ratio.

[0070] S43, based on the ammonia blending mass ratio, the volume of dry flue gas generated by burning unit mass of fuel, the volume of water vapor generated by burning unit mass of fuel, and the corresponding average constant-pressure specific heat capacity, the flue gas heat loss is calculated, which is expressed as:

[0071] wherein, is the heat loss of flue gas, is the dry flue gas from 25℃ to flue gas temperature average specific heat capacity at constant pressure, is the water vapor from 25℃ to flue gas temperature average specific heat capacity at constant pressure.

[0072] S44, considering the ammonia-doped mass ratio, calculating the gas incomplete combustion loss, solid incomplete combustion loss and ash physical heat loss, the formula is expressed as: Considering the ammonia-doped mass ratio, calculating the gas incomplete combustion loss, the formula is expressed as:

[0073] wherein, is the gas incomplete combustion loss, is the volume fraction of CO in the gas component at the outlet of the air preheater, is the volume fraction of NH3 in the gas component at the outlet of the coal economizer; It should be noted that in the calculation of the gas incomplete combustion loss, in addition to considering the ammonia-doped ratio, the influence of incomplete combustion of ammonia gas is also considered, which improves the calculation accuracy.

[0074] Considering the ammonia-doped mass ratio, calculating the solid incomplete combustion loss, the formula is expressed as:

[0075] wherein, is the solid incomplete combustion loss; Considering the ammonia-doped mass ratio, calculating the ash physical heat loss, the formula is expressed as:

[0076] wherein, is the ash physical heat loss, is the fly ash from 25℃ to the fly ash temperature at the boundary of the boiler system average specific heat, obtained by table lookup or by formula calculation, is the fly ash temperature at the boundary of the boiler system, the temperature of the fly ash is taken as the flue gas temperature at the corresponding position, and the flue gas temperature is taken as the flue gas temperature, is the slag from 25℃ to the slag temperature at the boundary of the boiler system average specific heat, obtained by table lookup or by formula calculation, is the slag temperature at the boundary of the boiler system, the slag temperature is taken as the measured value or the design value, and the solid slag is taken as 800℃.

[0077] S45, considering the ambient temperature, the ammonia blending mass ratio, the average specific heat of the fuel, the dry air volume and the water vapor volume in the air of the combustion unit mass fuel entering the boiler, and the corresponding average constant-pressure specific heat capacity, the percentage of external heat to the low heat value of the fuel is calculated, which is expressed by the formula:

[0078] In the formula, the percentage of external heat to the low heat value of the fuel, the ammonia blending mass ratio, the temperature of the coal entering the furnace from 25°C to the boundary of the coal entering the boiler system the average specific heat, the temperature of the coal entering the boundary of the boiler system, the temperature of the ammonia fuel entering the furnace from 25°C to the boundary of the ammonia fuel entering the boiler system the average constant-pressure specific heat capacity, the temperature of the ammonia fuel entering the boundary of the boiler system, the temperature of the dry air from 25°C to the boundary of the air entering the boiler system the average constant-pressure specific heat capacity, the temperature of the air entering the boundary of the boiler system, the temperature of the water vapor in the air from 25°C to the boundary of the air entering the boiler system the average constant-pressure specific heat capacity.

[0079] wherein, , , obtained by table lookup or by formula calculation; , , , all taking the ambient temperature t0.

[0080] It should be noted that the calculation of the above-mentioned various losses takes into account the ammonia blending mass ratio, is suitable for the ammonia coal combustion scene, and in the calculation process of the percentage of external heat to the low heat value of the fuel, mainly considers the sensible heat of the input unit mass of coal and ammonia fuel, the actual dry air and the water content in the air of the unit mass fuel combustion input, and the temperature of the coal entering the boundary of the boiler system, the temperature of the ammonia fuel, the temperature of the air and the temperature of the water vapor in the air are all taken as the ambient temperature to simplify the calculation.

[0081] S46, based on the flue gas heat loss, the gas incomplete combustion loss, the solid incomplete combustion loss, the ash physical heat loss, the percentage of external heat to the low heat value of the fuel, the boiler heat loss and other heat losses, the calculated value of the boiler efficiency is obtained.

[0082] Specifically, the calculated value of the boiler efficiency is:

[0083] wherein, is the calculated value of the boiler efficiency; is the heat loss of exhaust smoke; is the incomplete combustion loss of gas; is the incomplete combustion loss of solid; is the heat loss of boiler radiation, taking the design value; is the physical heat loss of ash and slag; is other heat loss, taking 0.3%; is the percentage of external heat and low heat value of fuel.

[0084] As a further preferred technical solution, in the step S50, the calculated value of the boiler efficiency is compared with the assumed value of the boiler efficiency to determine whether the iteration termination condition is met, specifically comprising: the calculated value of the boiler efficiency η s is compared with the assumed value of the boiler efficiency η js to determine whether |η s -η js |<=0.01%; If yes, the iteration termination condition is met, and if no, the iteration termination condition is not met.

[0085] It should be noted that when it is determined that the iteration termination condition is not met, the calculated value of the boiler efficiency replaces the assumed value of the boiler efficiency to re-execute the steps S30-S50 for cyclic iteration.

[0086] It should be noted that the present embodiment is directed to ammonia combustion of coal-fired units, fully considers the special influence of ammonia combustion, re-derives the formula of actual air volume, actual flue gas volume and flue gas components per unit mass of ammonia coal mixed combustion according to the chemical reaction equation of ammonia coal mixed combustion, and does not involve excess air coefficient, solving the problem of inapplicability of the formula in the test procedure, and being more operable in actual field application; and considering the coupling of the boiler efficiency and the ammonia mixing ratio, and the boiler efficiency being the test target, resulting in that the ammonia mixing ratio cannot be accurately controlled in the actual test field, the present application calculates the test result of the boiler efficiency according to the principle of energy conservation under the condition that the ammonia mixing ratio and the boiler efficiency are both unknown, and the accuracy and reliability of the test result of the boiler efficiency are higher, solving the problem of insufficient applicability of the traditional method, and providing a reliable energy efficiency evaluation basis for the engineering application of the ammonia combustion technology.

[0087] In addition, as Fig. 3 shown, the second embodiment of the present application proposes a boiler efficiency calculation system for ammonia combustion of coal-fired units, which comprises: The parameter analysis module 10 is configured to sample and analyze physical parameters of the coal, the ammonia fuel, the fly ash and the slag, and to synchronously measure the physical parameters on the boiler side and the physical parameters on the steam turbine side. The effective energy calculation module 20 is configured to calculate the effective energy output by the boiler according to the physical parameters on the steam turbine side. The ammonia mixing mass ratio calculation module 30 is configured to calculate the ammonia mixing mass ratio according to the assumed value of the boiler efficiency, the effective energy output by the boiler and the physical parameters on the boiler side, and by using the energy conservation principle. The boiler efficiency calculation module 40 is configured to calculate the calculated value of the boiler efficiency according to the ammonia mixing mass ratio, and by using the counter-balance method. The iteration module 50 is configured to compare the calculated value of the boiler efficiency with the assumed value of the boiler efficiency, to determine whether the iteration termination condition is met, to recalculate the ammonia mixing mass ratio and the calculated value of the boiler efficiency by using the calculated value of the boiler efficiency as the assumed value of the boiler efficiency if the iteration termination condition is not met, and to take the calculated value of the boiler efficiency as the actual value of the boiler efficiency if the iteration termination condition is met.

[0088] It should be noted that other embodiments or specific implementation methods of the coal-fired unit ammonia combustion boiler efficiency measuring and calculating system can refer to the above method embodiments, and will not be described here.

[0089] In addition, the third embodiment of the present application further provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to realize the coal-fired unit ammonia combustion boiler efficiency measuring and calculating method according to the first embodiment.

[0090] It should be noted that the computer readable medium disclosed in the present embodiment can be a computer readable signal medium or a computer readable storage medium, or any combination of the two. The computer readable storage medium may, for example, but is not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or component, or any combination of the above. More specific examples of the computer readable storage medium can include, but are not limited to, an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD The computer readable medium can be a tangible medium (e.g., diskette, CD-ROM, ROM, flash memory, etc.) on which is stored computer readable code. The computer readable medium can also be a computer readable signal medium or a transitory medium which includes a computer readable program code. The computer readable signal medium can include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. The computer readable signal medium can also include any computer readable medium other than a computer readable storage medium (e.g., those that are transitory) sent into an execution environment (e.g., via a wired or wireless network connection) with the computer readable program code embodied therein. The computer readable signal medium can include a computer readable program code.

[0091] The computer readable medium can be included inside the electronic device; or can exist separately from the electronic device. The computer readable medium carries one or more programs which, when executed by the electronic device, cause the electronic device to perform a zero-shot image anomaly detection method of the embodiments.

[0092] Computer program code for carrying out operations of the present disclosure can be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C++ or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code can execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server.

[0093] In the case of implementing the present disclosure with the use of a remote computer, the remote computer can be connected to the user's computer through any kind of network, including a local area network (LAN) or a wide area network (WAN), or can be connected to an external computer (for example, through the Internet using an Internet service provider).

[0094] It should be understood that various parts of the present application can be implemented in hardware, software, firmware or a combination thereof. In the above embodiments, various steps or methods can be implemented in software or firmware that is stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any of the following technologies, known in the art, or their combinations can be used: discrete logic circuitry having logic gates for implementing logic functions upon data signals, application specific integrated circuits having appropriate combinational logic gates, programmable gate arrays (PGA), field programmable gate arrays (FPGA), and the like.

[0095] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in one or more embodiments or examples.

[0096] In addition, the terms "first", "second" are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of", "several" is at least two, for example, two, three, etc., unless otherwise explicitly specified.

[0097] Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and cannot be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A method for calculating the efficiency of an ammonia-blended combustion boiler in a coal-fired unit, characterized in that, include: The physical parameters of the coal, ammonia fuel, fly ash and slag fed into the furnace were sampled and analyzed, and the physical parameters on the boiler side and the turbine side were measured simultaneously. Calculate the effective energy output of the boiler based on the physical parameters of the steam turbine side; Based on the assumed value of boiler efficiency, the effective energy output of the boiler, and the physical parameters on the boiler side, the mass ratio of ammonia blending is calculated using the principle of energy conservation. The calculated boiler efficiency is determined using the reverse balance method based on the ammonia blending ratio. The calculated value of boiler efficiency is compared with the assumed value of boiler efficiency to determine whether the iteration termination condition is met. If not, the calculated value of boiler efficiency is used to replace the assumed value of boiler efficiency and the calculated value of ammonia blending mass ratio and boiler efficiency are recalculated. If so, the calculated value of boiler efficiency is used as the actual value of boiler efficiency.

2. The method for calculating the efficiency of ammonia-blended combustion boilers in coal-fired units as described in claim 1, characterized in that, The sampling and analysis of the physical parameters of the coal, ammonia fuel, fly ash, and slag fed into the furnace, and the simultaneous measurement of physical parameters on both the boiler and turbine sides, include: The physical parameters of the coal fed into the furnace include moisture (Mt) and ash (A) in the coal (as received). ar volatile matter V ar Carbon C ar Hydrogen H ar Oxygen ar Nitrogen N ar Sulfur S ar and low heating value Q net,ar ; The physical parameters of the ammonia fuel fed into the furnace include purity and lower heating value. ; The physical parameters of the fly ash and slag include the carbon mass fraction (C) in the fly ash. fh and the carbon mass fraction C in slag lz ; The boiler-side physical parameters include the mass flow rate of ammonia fuel entering the furnace. Smoke exhaust temperature t py Volume fraction of NH3 in the flue gas composition at the economizer outlet The volume fraction of O2 in the flue gas at the air preheater outlet is Volume fraction of CO X CO Ambient temperature t0, relative humidity and atmospheric pressure P0; The turbine-side physical parameters include the first turbine-side physical parameters obtained by direct measurement of main feedwater flow rate and the second turbine-side physical parameters obtained by condensate flow rate reference measurement method.

3. The method for calculating the efficiency of ammonia-blended combustion boilers in coal-fired units as described in claim 2, characterized in that, The formula for calculating the effective energy output of the boiler based on the physical parameters of the steam turbine side is expressed as follows: In the formula, To output effective energy to the boiler, Main water supply flow rate, To reduce the flow rate of the superheated water, This is the cold resteam flow rate. To reduce the flow rate of reheat desuperheating water, Main vapor enthalpy, Main feedwater enthalpy, For the enthalpy of water under superheating and cooling, Enthalpy of reheated steam For cold reheat steam enthalpy, For reheat cooling water enthalpy; Wherein, if the main feedwater flow rate is obtained by directly measuring it using the direct measurement method, and if the condensate flow rate is measured using the reference measurement method, the calculation formula for the main feedwater flow rate is: In the formula, Main condensate flow rate, This is the equivalent flow rate for changes in deaerator water level. , , h1, h2, h3, and h4 are the inlet enthalpy of high-pressure heaters No. 1, No. 2, and No. 3, and the deaerator, respectively. d1 h d2 h d3 The hydrophobic enthalpy of high-pressure heaters No. 1, No. 2, and No. 3 are respectively, h f0 h f1 The enthalpy of the outlet and inlet water of the No. 1 high-pressure heater are respectively, h f2 h f3 The inlet enthalpy of the No. 2 and No. 3 high-pressure heaters are respectively, h f4 h f5 These are the enthalpy of the deaerator outlet and inlet water, respectively. a, b, and c are the steam inlet flow rate G1 and the main feedwater flow rate G1, respectively. fw The ratio of the No. 2 high-pressure steam inlet flow rate G2 to the main feedwater flow rate G fw The ratio of the No. 3 high-pressure steam inlet flow rate G3 to the main feedwater flow rate G fw The ratio of .

4. The method for calculating the efficiency of a coal-fired unit ammonia-blended combustion boiler as described in claim 1, characterized in that, The ammonia blending ratio is calculated based on the assumed boiler efficiency, the effective energy output of the boiler, and the physical parameters of the boiler side, using the principle of energy conservation. The formula is as follows: In the formula, The mass ratio of ammonia added. The mass flow rate of the ammonia fuel entering the furnace. To output effective energy to the boiler, This is an assumed value for boiler efficiency. The lower heating value of the ammonia fuel fed into the furnace, This refers to the lower heating value of the coal fed into the furnace.

5. The method for calculating the efficiency of ammonia-blended combustion boilers in coal-fired units as described in claim 1, characterized in that, The calculated value of boiler efficiency based on the ammonia blending ratio using the reverse balance method includes: Calculate the actual carbon content of the coal fed into the furnace based on the physical parameters of the coal, fly ash, and slag. Based on the ammonia blending mass ratio, the actual carbon content of the coal fed into the furnace, and the physical parameters of the coal fed into the furnace, the volume of dry air entering the boiler per unit mass of fuel, the volume of dry flue gas generated per unit mass of fuel, and the volume of water vapor generated per unit mass of fuel are calculated. Based on the ammonia blending mass ratio, the volume of dry flue gas generated per unit mass of fuel combustion, the volume of water vapor generated per unit mass of fuel combustion, and the corresponding average isobaric specific heat capacity, calculate the flue gas heat loss. Considering the aforementioned ammonia blending mass ratio, calculate the losses from incomplete gas combustion, incomplete solid combustion, and physical heat loss from ash and slag. Considering the ambient temperature, ammonia blending ratio, average specific heat of fuel, dry air volume and water vapor volume in the air per unit mass of fuel entering the boiler, and the corresponding average constant pressure specific heat capacity, calculate the percentage of external heat to the lower heating value of fuel. The calculated boiler efficiency is obtained based on flue gas heat loss, incomplete combustion of gas, incomplete combustion of solids, physical heat loss of ash and slag, percentage of external heat and lower heating value of fuel, boiler heat dissipation loss and other heat losses.

6. The method for calculating the efficiency of a coal-fired unit ammonia-blended combustion boiler as described in claim 5, characterized in that, The calculation of the dry air volume entering the boiler per unit mass of fuel combustion, the dry flue gas volume generated per unit mass of fuel combustion, and the water vapor volume generated per unit mass of fuel combustion, based on the ammonia blending mass ratio, the actual carbon content of the coal burned, and the physical parameters of the coal, includes: Based on the ammonia blending mass ratio, the actual carbon content of the coal fed into the boiler, the volume fraction of hydrogen, oxygen, nitrogen, and sulfur in the coal (as received), and the volume fraction of O2 in the flue gas composition at the air preheater outlet, the volume of dry air entering the boiler per unit mass of fuel burned is calculated using the following formula: In the formula, The volume of dry air entering the boiler per unit mass of fuel for combustion. The actual carbon produced by the combustion of coal fed into the furnace. Nitrogen in the coal fed into the furnace (on a received basis) This represents the volume fraction of O2 in the flue gas composition at the air preheater outlet. Hydrogen in the coal (received basis) fed into the furnace. For the oxygen in the coal (received basis) fed into the furnace, Sulfur content in the coal fed into the furnace (on a received basis); Based on the ammonia blending mass ratio, the volume of dry air entering the boiler per unit mass of fuel combustion, and the hydrogen, oxygen, and nitrogen content in the coal fed into the boiler (on a received basis), the volume of dry flue gas generated per unit mass of fuel combustion is calculated using the following formula: In the formula, The volume of dry flue gas generated per unit mass of fuel burned; Based on the ammonia blending ratio, the volume of dry air entering the boiler per unit mass of fuel combustion, the hydrogen content in the coal (as received), and environmental parameters, the volume of steam generated per unit mass of fuel combustion is calculated using the following formula: In the formula, The volume of water vapor generated per unit mass of fuel burned. The volume of water vapor in the air entering the boiler per unit mass of fuel for combustion. This refers to the volume of water vapor formed per unit mass of coal containing moisture. This refers to the volume of water vapor produced by burning a unit mass of hydrogen fuel. This refers to the relative humidity of the air. This is the saturation pressure of water vapor in the air at atmospheric temperature. Atmospheric pressure, Moisture content in the coal (received basis) fed into the furnace.

7. The method for calculating the efficiency of ammonia-blended combustion boilers in coal-fired units as described in claim 5, characterized in that, The formula for calculating the actual carbon content of the coal fed into the furnace based on the physical parameters of the coal, fly ash, and slag is as follows: In the formula, The actual carbon produced by the combustion of coal fed into the furnace. The carbon content in the coal fed into the furnace (on a received basis). The ash content in the coal (received basis) fed into the furnace. This represents the carbon mass fraction in fly ash. This refers to the mass fraction of fly ash relative to the total ash content of the coal fed into the furnace. The carbon mass fraction in the slag. This refers to the mass fraction of slag relative to the total ash content of the coal fed into the furnace.

8. The method for calculating the efficiency of ammonia-blended combustion boilers in coal-fired units as described in claim 5, characterized in that, The formula for calculating the heat loss from the exhaust gas is: In the formula, For flue gas heat loss, For dry flue gas from 25°C to exhaust temperature Average specific heat capacity at constant pressure The volume of water vapor generated per unit mass of fuel burned. For water vapor from 25℃ to flue gas temperature Average specific heat capacity at constant pressure.

9. The method for calculating the efficiency of a coal-fired unit ammonia-blended combustion boiler as described in claim 5, characterized in that, The calculation of incomplete combustion losses of gas, incomplete combustion losses of solids, and physical heat losses of ash and slag, taking into account the ammonia blending ratio, includes: Considering the aforementioned ammonia blending mass ratio, the uncombustible gas loss is calculated using the following formula: In the formula, Losses due to incomplete combustion of gases This represents the volume fraction of CO in the flue gas composition at the air preheater outlet. The lower heating value of the ammonia fuel fed into the furnace, The volume fraction of NH3 in the flue gas at the economizer outlet is ; Considering the aforementioned ammonia blending mass ratio, the unburned solid loss is calculated using the following formula: In the formula, Losses due to incomplete combustion of solids; Considering the aforementioned ammonia blending ratio, the physical heat loss of the ash slag is calculated using the following formula: In the formula, For the physical heat loss of ash and slag, The fly ash temperature from 25°C to the boundary of the boiler system. Average specific heat The fly ash temperature at the boundary of the boiler system. The temperature of the slag from 25°C to the slag temperature at the boundary of the boiler system. Average specific heat The slag temperature at the boundary of the boiler system.

10. The method for calculating the efficiency of a coal-fired unit ammonia-blended combustion boiler as described in claim 5, characterized in that, Taking into account the ambient temperature, ammonia blending ratio, average specific heat of fuel, dry air volume and water vapor volume per unit mass of fuel entering the boiler, and the corresponding average isobaric specific heat capacity, the percentage of external heat to the lower heating value of fuel is calculated using the following formula: In the formula, It is the percentage of external heat and the lower heating value of fuel. The temperature of the coal entering the furnace is from 25°C to the combustion temperature at the boundary of the boiler system. Average specific heat The coal temperature at the boundary of the boiler system. The temperature of the ammonia fuel entering the boiler from 25°C to the temperature of the ammonia fuel entering the boiler system boundary. Average specific heat capacity at constant pressure The temperature of the ammonia fuel entering the boiler system boundary, The temperature of dry air from 25°C to the air temperature entering the boiler system boundary. Average specific heat capacity at constant pressure The air temperature at the boundary of the boiler system. The temperature of water vapor in the air from 25°C to the air temperature at the boundary of the boiler system. Average specific heat capacity at constant pressure.

11. The method for calculating the efficiency of a coal-fired unit ammonia-blended combustion boiler as described in claim 5, characterized in that, The boiler efficiency is calculated based on flue gas heat loss, incomplete combustion of gases, incomplete combustion of solids, physical heat loss from ash and slag, the percentage of external heat and lower heating value of fuel, boiler heat dissipation loss, and other heat losses. The formula is as follows: In the formula, This is the calculated value for boiler efficiency. For flue gas heat loss, Losses due to incomplete combustion of gases Loss due to incomplete combustion of solids. For boiler heat loss, For the physical heat loss of ash and slag, For other heat losses, It represents the percentage of external heat and the lower heating value of the fuel.

12. The method for calculating the efficiency of a coal-fired unit ammonia-blended combustion boiler as described in claim 1, characterized in that, The step of comparing the calculated value of boiler efficiency with the assumed value of boiler efficiency to determine whether the iteration termination condition is met includes: The calculated value of boiler efficiency η s The assumed value η of boiler efficiency js Compare and determine whether |η s -η js |<=0.01%; If yes, then the iteration termination condition is met; otherwise, the iteration termination condition is not met.

13. A system for calculating the efficiency of an ammonia-blended combustion boiler in a coal-fired unit, characterized in that, include: The parameter analysis module is used to sample and analyze the physical parameters of the coal, ammonia fuel, fly ash and slag fed into the furnace, and simultaneously measure the physical parameters on the boiler side and the turbine side. The effective energy calculation module is used to calculate the effective energy output of the boiler based on the physical parameters on the turbine side. The ammonia blending ratio calculation module is used to calculate the ammonia blending ratio based on the assumed value of boiler efficiency, the effective energy output of the boiler, and the physical parameters on the boiler side, using the principle of energy conservation. The boiler efficiency calculation module is used to calculate the boiler efficiency based on the ammonia blending ratio using the reverse balance method. The iteration module compares the calculated value of boiler efficiency with the assumed value of boiler efficiency to determine whether the iteration termination condition is met. If not, the calculated value of boiler efficiency replaces the assumed value of boiler efficiency and the calculated value of ammonia blending mass ratio and boiler efficiency are recalculated. If the condition is met, the calculated value of boiler efficiency is used as the actual value of boiler efficiency.

14. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the method for calculating the efficiency of ammonia-infused combustion boilers in coal-fired units as described in any one of claims 1-12.

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