CN111507624B - Method and device for acquiring boiler efficiency of thermal power plant - Google Patents
Method and device for acquiring boiler efficiency of thermal power plant Download PDFInfo
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- CN111507624B CN111507624B CN202010303910.2A CN202010303910A CN111507624B CN 111507624 B CN111507624 B CN 111507624B CN 202010303910 A CN202010303910 A CN 202010303910A CN 111507624 B CN111507624 B CN 111507624B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q10/00—Administration; Management
- G06Q10/06—Resources, workflows, human or project management; Enterprise or organisation planning; Enterprise or organisation modelling
- G06Q10/063—Operations research, analysis or management
- G06Q10/0639—Performance analysis of employees; Performance analysis of enterprise or organisation operations
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q50/00—Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
- G06Q50/06—Electricity, gas or water supply
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
Abstract
The embodiment of the application provides a method and a device for acquiring the efficiency of a boiler of a thermal power plant, wherein the method comprises the following steps: judging whether an air preheater bypass is arranged in a boiler of the target thermal power plant, if so, setting a mixed flue between an outlet flue of the air preheater and a flue of the air preheater bypass as a target outlet boundary; collecting a water supply parameter set from between the air preheater bypass and the turbine side of the thermal power plant according to the target outlet boundary, determining the lost heat of the air preheater bypass, and determining the heat loss of the air preheater bypass according to the lost heat and the received low-order heating value of the fuel entering the boiler; the heat loss is added to the total heat loss of the boiler and the efficiency of the boiler is obtained based on the total heat loss of the boiler. According to the method and the device, the accuracy of acquiring the efficiency of the thermal power plant with the air preheater bypass can be effectively improved, and the degree of automation and the efficiency of the acquiring process of the efficiency of the thermal power plant with the air preheater bypass can be effectively improved.
Description
Technical Field
The application relates to the technical field of boiler operation, in particular to a method and a device for acquiring boiler efficiency of a thermal power plant.
Background
The heat loss of the discharged smoke of the boiler of the thermal power plant is the largest heat loss of each item of the boiler, and has great significance in deep utilization of the waste heat of discharged smoke of the boiler. The most common mode of the thermal power plant in the partial area for utilizing the flue gas waste heat at present is to additionally install a flue gas waste heat utilization device at a tail flue of a boiler. Along with the continuous popularization of the flue gas waste heat utilization device, various flue gas waste heat utilization systems with different arrangement positions and types are gradually applied to a thermal power plant, for example, the flue gas waste heat is utilized to directly heat condensation water, the flue gas waste heat is utilized to heat circulating water and then a heat exchanger is utilized to heat condensation water, the flue gas waste heat is utilized to heat circulating water and then cool air entering an air preheater, the flue gas waste heat is utilized to heat circulating water and then flue gas entering a chimney is utilized to heat. Accordingly, it is necessary to make a determination of boiler efficiency with respect to the thermal power plant boiler of the above-described structure to ensure reliable operation of the thermal power plant boiler based on the boiler efficiency.
In recent years, a flue gas bypass is arranged in a boiler air preheater, a high-pressure and low-pressure two-stage flue gas-water heat exchanger is arranged in the bypass, and a novel flue gas waste heat utilization system for heating feed water and condensed water by utilizing flue gas heat is started to be applied to a power plant. However, the traditional power station boiler efficiency calculation is calculated according to GB/T10184-2015 Power station boiler Performance test procedure or ASEM PTC4-2013 Fired Steam Generators Performance Test Codes, the method is based on the dividing principle of the boundary of the heat balance system of the conventional pulverized coal power station boiler efficiency calculation, and an air preheater bypass is not considered, so that the accuracy of acquiring the efficiency of the thermal power plant with the air preheater bypass cannot be ensured, and further the reliability of performing the operation adjustment of the thermal power plant boiler based on the efficiency of the thermal power plant boiler cannot be ensured.
Disclosure of Invention
To the problem among the prior art, this application provides a thermal power plant boiler efficiency acquisition method and device, can effectively improve the acquisition accuracy of thermal power plant boiler efficiency with air heater bypass, and can effectively improve the degree of automation and the efficiency of the acquisition process of thermal power plant boiler efficiency with air heater bypass, and then can effectively guarantee to carry out the reliability and the adjustment efficiency of thermal power plant boiler operation adjustment based on thermal power plant boiler efficiency.
In order to solve the technical problems, the application provides the following technical scheme:
in a first aspect, the present application provides a method for obtaining boiler efficiency of a thermal power plant, including:
judging whether an air preheater bypass connected with an outlet flue of a boiler furnace is arranged in a boiler of a current target thermal power plant, if so, setting a mixed flue between the outlet flue of the air preheater in the boiler of the target thermal power plant and the flue of the air preheater bypass as a target outlet boundary of the boiler of the target thermal power plant;
collecting values of various parameters in a preset water supply parameter set from between the bypass of the air preheater and the turbine side of the thermal power plant according to the target outlet boundary;
Determining the heat loss of the air preheater bypass based on the values of the various parameters in the feedwater parameter set, and determining the heat loss of the air preheater bypass according to the heat loss of the air preheater bypass and the pre-acquired received base low-order heating value of the fuel entering the boiler;
the heat loss of the air preheater bypass is added to the total heat loss of the boiler and the efficiency of the boiler is obtained based on the total heat loss of the boiler.
Further, the air preheater bypass comprises a high-pressure flue gas-water heat exchanger and a low-pressure flue gas-water heat exchanger which are connected with each other, wherein the high-pressure flue gas-water heat exchanger is connected with an outlet flue of the boiler furnace, and the mixing flue is formed at the junction between the outlet flue of the low-pressure flue gas-water heat exchanger and the outlet flue of the air preheater;
correspondingly, the step of setting the mixed flue between the outlet flue of the air preheater and the flue of the air preheater bypass in the target thermal power plant boiler as the target outlet boundary of the target thermal power plant boiler comprises the following steps:
determining an intersection point between an outlet flue of an air preheater in the target thermal power plant boiler and a flue of the air preheater bypass;
And selecting a mixing pipeline with a preset distance from the junction as a target outlet boundary of the target thermal power plant boiler, wherein the preset distance is larger than or equal to two times of the equivalent diameter of the outlet flue.
Further, the turbine side of the thermal power plant comprises a high-pressure heater group, a water supply pump, a deaerator and a low-pressure heater group which are sequentially communicated;
the inlet of the high-pressure smoke-water heat exchanger is communicated with a water supply pipeline at the outlet of the water supply pump, and the outlet of the high-pressure smoke-water heat exchanger is communicated with an outlet pipeline of the high-pressure heater group;
an inlet of the low-pressure flue gas-water heat exchanger is communicated with a condensed water inlet flue of the low-pressure heater group, and an outlet of the low-pressure flue gas-water heat exchanger is connected between a condensed water outlet flue of the low-pressure heater group and an inlet flue of the deaerator;
correspondingly, the step of collecting values of each parameter in a preset water supply parameter set from between the bypass of the air preheater and the turbine side of the thermal power plant according to the target outlet boundary comprises the following steps:
collecting an inlet feed water enthalpy value H of the high-pressure smoke-water heat exchanger from between an inlet of the high-pressure smoke-water heat exchanger and a feed water pipeline at an outlet of the feed water pump gy,en ；
Collecting an outlet feedwater enthalpy value H of the high-pressure flue gas-water heat exchanger from between an outlet of the high-pressure flue gas-water heat exchanger and an outlet pipeline of the high-pressure heater group gy,lv ；
Collecting the water supply flow q in the high-pressure smoke-water heat exchanger m,gy ；
Collecting an inlet condensate enthalpy value H of the low-pressure flue gas-water heat exchanger from between an inlet of the low-pressure flue gas-water heat exchanger and a condensate inlet flue of the low-pressure heater group dy,en ；
Collecting the outlet of the low-pressure flue gas-water heat exchanger from between the outlet of the low-pressure flue gas-water heat exchanger and a condensed water outlet flue of the low-pressure heater groupEnthalpy value of water condensed at mouth H dy,lv ；
Collecting the water supply flow q in the low-pressure flue-water heat exchanger m,dy 。
Further, the determining the lost heat of the air preheater bypass based on the values of the respective parameters in the set of feedwater parameters includes:
inlet feedwater enthalpy H based on the high-pressure flue-water heat exchanger gy,en The enthalpy value H of the feed water at the outlet of the high-pressure flue water heat exchanger gy,lv Feed water flow q in the high pressure flue water heat exchanger m,gy The enthalpy value H of inlet condensation water of the low-pressure flue-water heat exchanger dy,en The enthalpy value H of the condensed water at the outlet of the low-pressure flue gas water heat exchanger dy,lv And the feed water flow q in the low pressure flue water heat exchanger m,dy An air preheater bypass loss heat function is applied to determine the loss heat of the air preheater bypass.
Further, the air preheater bypass loss heat function is shown in the following formula (1):
in formula (1), q m,f A fuel mass flow rate for entering the boiler; q (Q) pl The heat lost to bypass the air preheater.
Further, the determining the heat loss of the air preheater bypass according to the heat loss of the air preheater bypass and the pre-acquired received base low-grade heating value of the fuel entering the boiler comprises the following steps:
heat loss Q according to the air preheater bypass pl And a pre-acquired received base low heat value Q of fuel entering the boiler net,ar Determining heat loss of the air preheater bypass based on a preset air preheater bypass heat loss function, wherein the air preheater bypass heat loss function is shown in the following formula (2):
in formula (2), q pl Heat loss bypassing the air preheater.
Further, the adding the heat loss of the air preheater bypass to the total heat loss of the boiler and obtaining the efficiency of the boiler based on the total heat loss of the boiler comprises:
based on pre-obtained heat loss q of exhaust gas, heat loss of incomplete combustion of solid, heat loss of heat dissipation of boiler, physical heat loss of ash and heat loss q of bypass of air preheater pl Determining a total heat loss of the boiler;
and determining the efficiency of the boiler by applying a preset heat loss method based on the total heat loss of the boiler and the received basic low-level heating value of the fuel entering the boiler.
In a second aspect, the present application provides a boiler efficiency acquisition device of a thermal power plant, including:
the target outlet boundary determining module is used for judging whether an air preheater bypass connected with an outlet flue of a boiler furnace is arranged in a current boiler of the target thermal power plant, if so, setting a mixed flue between the outlet flue of the air preheater in the boiler of the target thermal power plant and the flue of the air preheater bypass as a target outlet boundary of the boiler of the target thermal power plant;
the water supply parameter set acquisition module is used for acquiring the values of all parameters in a preset water supply parameter set from between the air preheater bypass and the turbine side of the thermal power plant according to the target outlet boundary;
an air preheater bypass heat loss acquisition module for determining a heat loss of the air preheater bypass based on the values of the respective parameters in the set of feedwater parameters, and determining a heat loss of the air preheater bypass based on the heat loss of the air preheater bypass and a pre-acquired received base low-level heat generation amount of fuel entering the boiler;
And the boiler efficiency acquisition module is used for adding the heat loss of the bypass of the air preheater to the total heat loss of the boiler and acquiring the efficiency of the boiler based on the total heat loss of the boiler.
In a third aspect, the present application provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor, where the processor implements the steps of the method for obtaining boiler efficiency of a thermal power plant when the processor executes the program.
In a fourth aspect, the present application provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the thermal power plant boiler efficiency acquisition method.
According to the technical scheme, the method and the device for acquiring the boiler efficiency of the thermal power plant provided by the application comprise the following steps: judging whether an air preheater bypass connected with an outlet flue of a boiler furnace is arranged in a boiler of a current target thermal power plant, if so, setting a mixed flue between the outlet flue of the air preheater in the boiler of the target thermal power plant and the flue of the air preheater bypass as a target outlet boundary of the boiler of the target thermal power plant; collecting values of various parameters in a preset water supply parameter set from between the bypass of the air preheater and the turbine side of the thermal power plant according to the target outlet boundary; determining the heat loss of the air preheater bypass based on the values of the various parameters in the feedwater parameter set, and determining the heat loss of the air preheater bypass according to the heat loss of the air preheater bypass and the pre-acquired received base low-order heating value of the fuel entering the boiler; the heat loss of the air preheater bypass is added into the total heat loss of the boiler, the efficiency of the boiler is obtained based on the total heat loss of the boiler, the accuracy of obtaining the boiler efficiency of a thermal power plant with the air preheater bypass can be effectively improved, the degree of automation and the efficiency of the obtaining process of the boiler efficiency of the thermal power plant with the air preheater bypass can be effectively improved, the reliability and the adjusting efficiency of the operation adjustment of the boiler of the thermal power plant based on the boiler efficiency of the thermal power plant can be effectively ensured, the accurate boiler efficiency can be obtained by power plant personnel, technical references are provided for improving the boiler efficiency and carrying out proper combustion adjustment and evaluation analysis according to the boiler efficiency, meanwhile, the economy of the air preheater bypass flue improvement of the power plant can be also evaluated, and reasonable improvement evaluation is guided by the power plant.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the operational logic of a boiler of a target thermal power plant provided with an air preheater bypass connected to the outlet flue of the boiler furnace in an embodiment of the present application.
Fig. 2 is a schematic flow chart of a method for obtaining boiler efficiency of a thermal power plant in an embodiment of the present application.
Fig. 3 is a schematic diagram of a specific flow of step 100 in a method for obtaining efficiency of a thermal power plant according to an embodiment of the present application.
Fig. 4 is a schematic flowchart of step 200 in the method for obtaining boiler efficiency of a thermal power plant according to an embodiment of the present application.
Fig. 5 is a schematic diagram of a specific flow of step 300 in a method for obtaining efficiency of a thermal power plant according to an embodiment of the present application.
Fig. 6 is a schematic diagram of a specific flow chart of step 400 in a method for obtaining efficiency of a thermal power plant according to an embodiment of the present application.
Fig. 7 is a schematic structural view of a boiler efficiency obtaining apparatus of a thermal power plant in an embodiment of the present application.
Fig. 8 is a schematic structural diagram of an electronic device in an embodiment of the present application.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
Traditional utility boiler efficiency calculations are calculated according to GB/T10184-2015 Power plant boiler Performance test procedure or ASEM PTC4-2013 Fired Steam Generators Performance Test Codes, but the application of the air preheater bypass flue gas waste heat utilization system changes the boundary of the calculated boiler efficiency, and the flue gas heat of the air preheater bypass is also used for heating the feedwater, which changes the method of calculating the boiler efficiency. In view of the problem, the embodiment of the application provides a method for acquiring the efficiency of a thermal power plant with an air preheater bypass, a device for acquiring the efficiency of the thermal power plant, an electronic device and a computer readable storage medium, wherein if the air preheater bypass connected with an outlet flue of a boiler furnace is arranged in a current target thermal power plant boiler, a mixed flue between the outlet flue of the air preheater in the target thermal power plant boiler and a flue of the air preheater bypass is set as a target outlet boundary of the target thermal power plant boiler; collecting values of various parameters in a preset water supply parameter set from between the bypass of the air preheater and the turbine side of the thermal power plant according to the target outlet boundary; determining the heat loss of the air preheater bypass based on the values of the various parameters in the feedwater parameter set, and determining the heat loss of the air preheater bypass according to the heat loss of the air preheater bypass and the pre-acquired received base low-order heating value of the fuel entering the boiler; the heat loss of the air preheater bypass is added into the total heat loss of the boiler, the efficiency of the boiler is obtained based on the total heat loss of the boiler, the accuracy of obtaining the boiler efficiency of a thermal power plant with the air preheater bypass can be effectively improved, the degree of automation and the efficiency of the obtaining process of the boiler efficiency of the thermal power plant with the air preheater bypass can be effectively improved, the reliability and the adjusting efficiency of the operation adjustment of the boiler of the thermal power plant based on the boiler efficiency of the thermal power plant can be effectively ensured, the accurate boiler efficiency can be obtained by power plant personnel, technical references are provided for improving the boiler efficiency and carrying out proper combustion adjustment and evaluation analysis according to the boiler efficiency, meanwhile, the economy of the air preheater bypass flue improvement of the power plant can be also evaluated, and reasonable improvement evaluation is guided by the power plant.
In one or more embodiments of the present application, a schematic diagram of the operational logic structure of a boiler of a target thermal power plant provided with an air preheater bypass connected to an outlet flue of a boiler furnace is shown in fig. 1, and cold primary air and cold secondary air entering the boiler are first heated by a primary air heater and a secondary air heater, wherein heat sources of the primary air and the secondary air heater are hot water from a low-heating outlet of a turbine side #7 of the power plant, and the hot water returns to a low-heating inlet #8 after heating the cold primary air and the cold secondary air; the heat of the cold primary air and the cold secondary air absorbed by the flue gas in the air preheater is changed into hot primary air and hot secondary air, the flue gas is discharged into low-temperature flue gas after releasing the heat in the air preheater, and part of the cold primary air is converged with the hot primary air to enter the coal mill after not entering the air preheater, and the fuel in the coal mill is conveyed into a boiler furnace together. After the bypass of the air preheater is added, a part of flue gas is shunted in an inlet flue of the air preheater to enter the bypass of the air preheater, and then is converged with flue gas exhausted by the air preheater after passing through the high-pressure flue gas-water heat exchanger and the low-pressure flue gas-water heat exchanger, wherein a heated medium in the high-pressure flue gas-water heat exchanger is water supply of a water supply pump outlet, the heated medium enters a #1 high-adding outlet after being heated, a heated medium in the low-pressure flue gas-water heat exchanger is mixed condensate water of a #6 low-adding inlet and a #5 low-adding inlet, and the heated medium enters a #5 low-adding outlet after being heated.
It will be appreciated that references to low add in one or more embodiments of the present application refer to low pressure heaters, high add refers to high pressure heaters, and for example, #5 low add inlet specifically refers to the inlet of the low pressure heater numbered # 5.
In one or more embodiments of the present application, each parameter in the set of water supply parameters specifically includes:
(1) Inlet feedwater enthalpy H of the high-pressure flue-water heat exchanger gy,en ；
(2) The enthalpy value H of the feed water at the outlet of the high-pressure flue water heat exchanger gy,lv ；
(3) Feed water flow q in the high-pressure flue water heat exchanger m,gy ；
(4) The enthalpy value H of inlet condensation water of the low-pressure flue water heat exchanger dy,en ；
(5) The enthalpy value H of the condensed water at the outlet of the low-pressure flue gas water heat exchanger dy,lv ；
(6) Feed water flow q in the low pressure flue water heat exchanger m,dy 。
Referring to FIG. 1, the fuel receives a lower heating value Q net,ar The mass flow rate of the fuel is q m,f . After the bypass of the air preheater is added, a part of flue gas is shunted in an inlet flue of the air preheater and enters the bypass of the air preheater, and the flue gas is converged with flue gas exhausted by the air preheater after passing through a high-pressure flue gas-water heat exchanger and a low-pressure flue gas-water heat exchanger, wherein a heated medium in the high-pressure flue gas-water heat exchanger is water supply at an outlet of a water supply pump, and enters an outlet of a #1 high-pressure pump after being heated, and the enthalpy value of the water supply entering the high-pressure flue gas-water heat exchanger is H gy,en The enthalpy value of the feed water at the outlet of the high-pressure smoke-water heat exchanger is H gy,lv The water supply flow rate flowing through the high-pressure smoke-water heat exchanger is q m,gy The method comprises the steps of carrying out a first treatment on the surface of the The heated medium in the low-pressure flue gas-water heat exchanger is mixed condensate water with #6 low-adding inlet and #5 low-adding inlet, the heated mixed condensate water enters the #5 low-adding outlet, and the enthalpy value of the condensate water entering the low-pressure flue gas-water heat exchanger is H dy,en The enthalpy value of condensation water at the outlet of the low-pressure flue gas water heat exchanger is H dy,lv The condensate flow rate flowing through the low-pressure flue gas-water heat exchanger is q m,dy 。
According to the principle of dividing the boundary of a heat balance system calculated for the efficiency of a conventional pulverized coal power station boiler in GB/T10184-2015 'power station boiler performance test procedure' or ASEM PTC4-2013 'FiredSteam Generators Performance Test Codes', the inlet boundary of a boiler air smoke system is generally defined at the cold primary air inlet and the secondary air inlet (namely the inlet boundary in figure 1), the temperature of primary air and secondary air is measured at the inlet boundary by using a grid method, the outlet boundary is defined at the flue gas outlet (namely the outlet boundary 1 in figure 1) of the air preheater, and the composition and the temperature of flue gas are measured at the outlet boundary by using a grid method. The flue gas waste heat utilization system of the bypass of the air preheater is arranged in parallel with the air preheater, the patent changes the outlet boundary of the system from the original flue gas outlet of the air preheater (at the outlet boundary 1 in fig. 1) to the back of the mixed flue of the air preheater and the bypass flue (at the outlet boundary 2 in fig. 1), and the measuring point position for measuring the flue gas components and the temperature should be at least 2D from the flue junction (D is the equivalent diameter of the outlet flue of the air preheater). This also places the air preheater bypass within the thermal balance system boundaries.
Based on the above, in order to effectively improve the accuracy of acquiring the efficiency of the thermal power plant with the bypass of the air preheater, and effectively improve the automation degree and the efficiency of the acquiring process of the efficiency of the thermal power plant with the bypass of the air preheater, further effectively ensure the reliability and the adjusting efficiency of the operation adjustment of the thermal power plant based on the efficiency of the thermal power plant, the application provides an embodiment of the method for acquiring the efficiency of the thermal power plant, referring to fig. 2, wherein the method for acquiring the efficiency of the thermal power plant specifically comprises the following steps:
step 100: and judging whether an air preheater bypass connected with an outlet flue of a boiler furnace is arranged in the boiler of the current target thermal power plant, if so, setting a mixed flue between the outlet flue of the air preheater in the boiler of the target thermal power plant and the flue of the air preheater bypass as a target outlet boundary of the boiler of the target thermal power plant.
It can be understood that the specific mode of judging whether the current boiler of the target thermal power plant is provided with the air preheater bypass connected with the outlet flue of the boiler furnace may be that the server for implementing the method for obtaining the boiler efficiency of the thermal power plant sends the request for obtaining the boiler structure schematic diagram of the target thermal power plant to the corresponding client device, receives the boiler structure schematic diagram of the target thermal power plant sent by the client device, performs preprocessing on the boiler structure schematic diagram of the target thermal power plant, processes the boiler structure schematic diagram into a picture meeting the requirement of the preset format, performs text or symbol recognition on the boiler structure schematic diagram of the target thermal power plant, and judges whether the text or symbol related to the air preheater bypass is included according to the text or symbol recognition result, if the text or symbol exists, the air preheater bypass connected with the outlet flue of the boiler furnace is arranged in the current boiler of the target thermal power plant.
Step 200: and acquiring the values of all parameters in a preset water supply parameter set from the position between the bypass of the air preheater and the turbine side of the thermal power plant according to the target outlet boundary.
Step 300: and determining the heat loss of the air preheater bypass based on the values of the parameters in the water supply parameter set, and determining the heat loss of the air preheater bypass according to the heat loss of the air preheater bypass and the pre-acquired low-order heating value of the fuel entering the boiler.
Step 400: the heat loss of the air preheater bypass is added to the total heat loss of the boiler and the efficiency of the boiler is obtained based on the total heat loss of the boiler.
In one or more embodiments of the present application, the air preheater bypass comprises a high pressure flue gas-water heat exchanger and a low pressure flue gas-water heat exchanger that are connected to each other, the high pressure flue gas-water heat exchanger is connected to the outlet flue of the boiler furnace, and the junction between the outlet flue of the low pressure flue gas-water heat exchanger and the outlet flue of the air preheater is formed with the mixing flue.
Based on this, in order to effectively improve the setting efficiency and reliability of the target outlet boundary, so as to further improve the accuracy of obtaining the efficiency of the thermal power plant with the bypass of the air preheater, in one embodiment of the method for obtaining the efficiency of the thermal power plant provided in the present application, referring to fig. 3, step 100 in the method for obtaining the efficiency of the thermal power plant specifically includes the following:
Step 101: determining an intersection point between an outlet flue of an air preheater in the target thermal power plant boiler and a flue of the air preheater bypass.
Step 102: and selecting a mixing pipeline with a preset distance from the junction as a target outlet boundary of the target thermal power plant boiler, wherein the preset distance is larger than or equal to two times of the equivalent diameter of the outlet flue.
In one or more embodiments of the present application, the turbine side of the thermal power plant includes a high pressure heater group, a feedwater pump, a deaerator, and a low pressure heater group that are in sequential communication; the inlet of the high-pressure smoke-water heat exchanger is communicated with a water supply pipeline at the outlet of the water supply pump, and the outlet of the high-pressure smoke-water heat exchanger is communicated with an outlet pipeline of the high-pressure heater group; the inlet of the low-pressure flue water heat exchanger is communicated with the condensed water inlet flue of the low-pressure heater group, and the outlet of the low-pressure flue water heat exchanger is connected between the condensed water outlet flue of the low-pressure heater group and the inlet flue of the deaerator.
Based on this, in order to effectively improve the collection efficiency and reliability of the values of the parameters in the feedwater parameter set, so as to further improve the accuracy of obtaining the efficiency of the thermal power plant with the bypass of the air preheater, in one embodiment of the method for obtaining the efficiency of the thermal power plant provided in the present application, referring to fig. 4, step 200 in the method for obtaining the efficiency of the thermal power plant specifically includes the following:
Step 201: collecting an inlet feed water enthalpy value H of the high-pressure smoke-water heat exchanger from between an inlet of the high-pressure smoke-water heat exchanger and a feed water pipeline at an outlet of the feed water pump gy,en 。
Step 202: collecting an outlet feedwater enthalpy value H of the high-pressure flue gas-water heat exchanger from between an outlet of the high-pressure flue gas-water heat exchanger and an outlet pipeline of the high-pressure heater group gy,lv 。
Step 203: collecting the water supply flow q in the high-pressure smoke-water heat exchanger m,gy 。
Step 204: collecting an inlet condensate enthalpy value H of the low-pressure flue gas-water heat exchanger from between an inlet of the low-pressure flue gas-water heat exchanger and a condensate inlet flue of the low-pressure heater group dy,en 。
Step 205: collecting an outlet condensate enthalpy value H of the low-pressure flue gas-water heat exchanger from between an outlet of the low-pressure flue gas-water heat exchanger and a condensate outlet flue of the low-pressure heater group dy,lv 。
Step 206: collecting the water supply flow q in the low-pressure flue-water heat exchanger m,dy 。
It should be understood that the above-mentioned execution sequence of steps 201 to 206 is merely an example, and in practical applications, the execution sequence of steps 201 to 206 may be any sequence or performed simultaneously, which is not limited in this application.
In order to effectively improve the accuracy of obtaining the heat loss of the air preheater bypass to further improve the accuracy of obtaining the efficiency of the thermal power plant with the air preheater bypass, in an embodiment of the method for obtaining the efficiency of the thermal power plant provided in the present application, referring to fig. 5, step 300 in the method for obtaining the efficiency of the thermal power plant specifically includes the following:
Step 301: inlet feedwater enthalpy H based on the high-pressure flue-water heat exchanger gy,en The enthalpy value H of the feed water at the outlet of the high-pressure flue water heat exchanger gy,lv Feed water flow q in the high pressure flue water heat exchanger m,gy The enthalpy value H of inlet condensation water of the low-pressure flue-water heat exchanger dy,en The enthalpy value H of the condensed water at the outlet of the low-pressure flue gas water heat exchanger dy,lv And the feed water flow q in the low pressure flue water heat exchanger m,dy An air preheater bypass loss heat function is applied to determine the loss heat of the air preheater bypass.
Wherein the air preheater bypass loss heat function is shown in the following formula (1):
in formula (1), q m,f A fuel mass flow rate for entering the boiler; q (Q) pl The heat lost to bypass the air preheater.
In order to effectively improve the accuracy of acquiring the heat loss of the air preheater bypass so as to further improve the accuracy of acquiring the efficiency of the thermal power plant with the air preheater bypass, in an embodiment of the method for acquiring the efficiency of the thermal power plant provided in the present application, referring to fig. 5, step 300 in the method for acquiring the efficiency of the thermal power plant further specifically includes the following:
step 302: heat loss Q according to the air preheater bypass pl And a pre-acquired received base low heat value Q of fuel entering the boiler net,ar The heat loss of the air preheater bypass is determined based on a preset air preheater bypass heat loss function.
Wherein the air preheater bypass heat loss function is shown in the following formula (2):
in formula (2), q pl Heat loss bypassing the air preheater.
In one embodiment of the method for obtaining the efficiency of the thermal power plant provided by the application, referring to fig. 6, step 400 in the method for obtaining the efficiency of the thermal power plant specifically includes the following steps:
step 401: based on pre-obtained heat loss q of exhaust gas, heat loss of incomplete combustion of solid, heat loss of heat dissipation of boiler, physical heat loss of ash and heat loss q of bypass of air preheater pl The total heat loss of the boiler is determined.
Step 402: and determining the efficiency of the boiler by applying a preset heat loss method based on the total heat loss of the boiler and the received basic low-level heating value of the fuel entering the boiler.
In order to further explain the scheme, the application also provides a specific application example of the method for acquiring the boiler efficiency of the thermal power plant, which specifically comprises the following contents:
according to GB/T10184-2015 'station boiler performance test procedure' or ASEM PTC4-2013 'Fired Steam Generators Performance Test Codes', an anti-balance method, namely a heat loss method, is generally adopted for calculating the boiler efficiency, and the calculation formula of the boiler efficiency is as follows:
in the formula (3):
η—boiler efficiency,%;
Q net,ar the generated heat of the fuel entering the boiler is obtained by testing the fuel, and kJ/kg;
Q ex -inputting the heat of the boundary of the system, kJ/kg; the calculation method can be referred to GB/T10184-2015 Power station boiler performance test procedure.
Q loss Total loss of boiler, kJ/kg; the calculation method of each loss generally comprises smoke discharging heat loss, gas incomplete combustion heat loss, solid incomplete combustion heat loss, boiler heat dissipation loss, ash physical heat loss and other heat loss, and can refer to GB/T10184-2015 power station boiler performance test procedure.
However, the method of calculating the boiler efficiency for a utility boiler system having an air preheater bypass is not embodied in GB/T10184-2015 Power station boiler Performance test procedure, and therefore cannot be referred to for execution in the test and calculation of the utility boiler efficiency having an air preheater bypass.
The flue gas heat in the air preheater bypass for heating condensate and feedwater is not used to heat the media in the boiler heat balance system, such as cold air, and therefore this heat should be calculated as part of the other heat loss from the boiler, calculated by the following equation:
in the formula (2):
q pl -air preheater bypass heat loss,%;
Q pl -the heat lost by the air preheater bypass, kJ/kg, calculated from the formula:
in the formula (1):
q m,gy -water supply flow in the high pressure flue gas-water heat exchanger, kg/h;
H gy,lv -enthalpy value of feed water at outlet of high-pressure flue-water heat exchanger, kJ/kg;
H gy,en -enthalpy value of inlet feedwater of the high-pressure flue-water heat exchanger, kJ/kg;
q m,dy -the water flow rate of condensation in the low-pressure flue gas-water heat exchanger, kg/h;
H dy,lv -the enthalpy value of condensate at the outlet of the low-pressure flue gas water heat exchanger, kJ/kg;
H dy,en -enthalpy value of condensate at inlet of low-pressure flue gas-water heat exchanger, kJ/kg;
q m,f -fuel mass flow into the boiler kg/h.
As can be seen from the above description, the method for obtaining boiler efficiency of a thermal power plant provided in the embodiments of the present application is as follows:
content 1: the power station boiler efficiency calculation boundary with air preheater bypass flue is changed from the air preheater flue gas outlet (at outlet boundary 1 in fig. 1) to after the air preheater and bypass flue mixing flue (at outlet boundary 2 in fig. 1), and where flue gas composition and temperature are measured for boiler efficiency calculation, the site location should be at least 2D from the flue junction (D is the equivalent diameter of the air preheater outlet flue).
Content 2: the boiler efficiency loss due to the heat of heating condensate or feedwater for the air preheater bypass stack is calculated as follows:
in the formula (2):
q pl -air preheater bypass heat loss,%;
Q net,ar the generated heat of the fuel entering the boiler is obtained by testing the fuel, and kJ/kg;
Q pl -the heat lost by the air preheater bypass, kJ/kg, calculated from the formula:
in the formula (1):
q m,gy -water supply flow in the high pressure flue gas-water heat exchanger, kg/h;
H gy,lv -enthalpy value of feed water at outlet of high-pressure flue-water heat exchanger, kJ/kg;
H gy,en -enthalpy value of inlet feedwater of the high-pressure flue-water heat exchanger, kJ/kg;
q m,dy -the water flow rate of condensation in the low-pressure flue gas-water heat exchanger, kg/h;
H dy,lv -the enthalpy value of condensate at the outlet of the low-pressure flue gas water heat exchanger, kJ/kg;
H dy,en -enthalpy value of condensate at inlet of low-pressure flue gas-water heat exchanger, kJ/kg;
q m,f -fuel mass flow into the boiler kg/h.
Based on the above 1 and 2, the present application example analyzes the calculation method of the efficiency of the utility boiler with the bypass flue of the air preheater, and proposes the calculation method of the efficiency calculation boundary of the utility boiler with the bypass flue of the air preheater and the heat loss of the boiler. The method can be used for guiding the detection and calculation of the efficiency of the power station boiler with the bypass flue of the air preheater, can be used for the detection analysis and the acceptance check of the efficiency of the boiler, so that power plant personnel can obtain accurate efficiency of the boiler, technical references are provided for improving the efficiency of the boiler and carrying out proper combustion adjustment and evaluation analysis according to the efficiency of the boiler by the power plant personnel, meanwhile, the economy of the air preheater bypass flue modification of the power plant can be evaluated, and the reasonable modification evaluation of the power plant is guided.
For the software aspect, in order to effectively improve the accuracy of acquiring the efficiency of the thermal power plant with the bypass of the air preheater, and effectively improve the automation degree and the efficiency of the acquiring process of the efficiency of the thermal power plant with the bypass of the air preheater, and further effectively ensure the reliability and the adjusting efficiency of the operation adjustment of the thermal power plant based on the efficiency of the thermal power plant, the application further provides an embodiment of a thermal power plant efficiency acquiring device for realizing all or part of the content in the acquiring method of the efficiency of the thermal power plant, see fig. 7, wherein the thermal power plant efficiency acquiring device specifically comprises the following contents:
the target outlet boundary determining module 10 is configured to determine whether an air preheater bypass connected to an outlet flue of a boiler furnace is provided in a current boiler of the target thermal power plant, and if yes, set a mixed flue between the outlet flue of the air preheater in the boiler of the target thermal power plant and the flue of the air preheater bypass as a target outlet boundary of the boiler of the target thermal power plant;
a feedwater parameter set acquisition module 20, configured to acquire values of parameters in a preset feedwater parameter set from between the bypass of the air preheater and a turbine side of the thermal power plant according to the target outlet boundary;
An air preheater bypass heat loss acquisition module 30 for determining the heat loss of the air preheater bypass based on the values of the various parameters in the set of feedwater parameters, and determining the heat loss of the air preheater bypass based on the heat loss of the air preheater bypass and the pre-acquired received base low heat generation value of the fuel entering the boiler;
a boiler efficiency acquisition module 40 for adding heat loss from the air preheater bypass to the total heat loss from the boiler and acquiring the efficiency of the boiler based on the total heat loss from the boiler.
The specific implementation content of the device for acquiring the boiler efficiency of the thermal power plant provided in the embodiment of the method for acquiring the boiler efficiency of the thermal power plant is referred to in the embodiment of the method for acquiring the boiler efficiency of the thermal power plant, and is not described herein.
From the above description, it can be seen that the thermal power plant boiler efficiency obtaining device provided by the embodiment of the application can effectively improve the accuracy of obtaining the thermal power plant boiler efficiency with the air preheater bypass, and can effectively improve the automation degree and efficiency of the obtaining process of the thermal power plant boiler efficiency with the air preheater bypass, and further can effectively ensure the reliability and adjustment efficiency of thermal power plant boiler operation adjustment based on the thermal power plant boiler efficiency, so that power plant personnel obtain accurate boiler efficiency, technical references are provided for improving the boiler efficiency and carrying out proper combustion adjustment and evaluation analysis according to the boiler efficiency, and meanwhile, the economy of the power plant for carrying out air preheater bypass flue reconstruction can be evaluated, and reasonable reconstruction evaluation is guided to the power plant.
For the hardware aspect, in order to improve the accuracy of acquiring the efficiency of the thermal power plant with the air preheater bypass, and effectively improve the automation degree and efficiency of the acquiring process of the efficiency of the thermal power plant with the air preheater bypass, and further effectively ensure the reliability and the adjusting efficiency of the operation adjustment of the thermal power plant based on the efficiency of the thermal power plant, the application provides an embodiment of an electronic device for realizing all or part of the content in the acquiring method of the efficiency of the thermal power plant, wherein the electronic device specifically comprises the following contents:
a processor (processor), a memory (memory), a communication interface (Communications Interface), and a bus; the processor, the memory and the communication interface complete communication with each other through the bus; the communication interface is used for realizing information transmission between the electronic equipment and related equipment such as the user terminal, the related database and the like; the electronic device may be a desktop computer, a tablet computer, a mobile terminal, etc., and the embodiment is not limited thereto. In this embodiment, the electronic device may refer to an embodiment of the method for obtaining the efficiency of the thermal power plant in the embodiment, and an embodiment of the device for obtaining the efficiency of the thermal power plant is implemented, and the contents thereof are incorporated herein, and the repetition is omitted.
Fig. 8 is a schematic block diagram of a system configuration of an electronic device 9600 of an embodiment of the present application. As shown in fig. 8, the electronic device 9600 may include a central processor 9100 and a memory 9140; the memory 9140 is coupled to the central processor 9100. Notably, this fig. 8 is exemplary; other types of structures may also be used in addition to or in place of the structures to implement telecommunications functions or other functions.
In an embodiment, the thermal power plant boiler efficiency acquisition function may be integrated into the central processor. Wherein the central processor may be configured to control:
step 100: and judging whether an air preheater bypass connected with an outlet flue of a boiler furnace is arranged in the boiler of the current target thermal power plant, if so, setting a mixed flue between the outlet flue of the air preheater in the boiler of the target thermal power plant and the flue of the air preheater bypass as a target outlet boundary of the boiler of the target thermal power plant.
It can be understood that the specific mode of judging whether the current boiler of the target thermal power plant is provided with the air preheater bypass connected with the outlet flue of the boiler furnace may be that the server for implementing the method for obtaining the boiler efficiency of the thermal power plant sends the request for obtaining the boiler structure schematic diagram of the target thermal power plant to the corresponding client device, receives the boiler structure schematic diagram of the target thermal power plant sent by the client device, performs preprocessing on the boiler structure schematic diagram of the target thermal power plant, processes the boiler structure schematic diagram into a picture meeting the requirement of the preset format, performs text or symbol recognition on the boiler structure schematic diagram of the target thermal power plant, and judges whether the text or symbol related to the air preheater bypass is included according to the text or symbol recognition result, if the text or symbol exists, the air preheater bypass connected with the outlet flue of the boiler furnace is arranged in the current boiler of the target thermal power plant.
Step 200: and acquiring the values of all parameters in a preset water supply parameter set from the position between the bypass of the air preheater and the turbine side of the thermal power plant according to the target outlet boundary.
Step 300: and determining the heat loss of the air preheater bypass based on the values of the parameters in the water supply parameter set, and determining the heat loss of the air preheater bypass according to the heat loss of the air preheater bypass and the pre-acquired low-order heating value of the fuel entering the boiler.
Step 400: the heat loss of the air preheater bypass is added to the total heat loss of the boiler and the efficiency of the boiler is obtained based on the total heat loss of the boiler.
From the above description, it can be known that the electronic device provided by the embodiment of the application can effectively improve the accuracy of acquiring the boiler efficiency of the thermal power plant with the air preheater bypass, and can effectively improve the automation degree and efficiency of the acquiring process of the boiler efficiency of the thermal power plant with the air preheater bypass, and further can effectively ensure the reliability and the adjusting efficiency of the operation adjustment of the boiler of the thermal power plant based on the boiler efficiency of the thermal power plant, so that the power plant personnel can obtain the accurate boiler efficiency, technical references are provided for improving the boiler efficiency and the proper combustion adjustment and evaluation analysis of the power plant personnel according to the boiler efficiency, and meanwhile, the economy of the air preheater bypass flue reconstruction of the power plant can be evaluated, and the reasonable reconstruction evaluation of the power plant is guided.
In another embodiment, the thermal power plant boiler efficiency obtaining apparatus may be configured separately from the cpu 9100, for example, the thermal power plant boiler efficiency obtaining apparatus may be configured as a chip connected to the cpu 9100, and the thermal power plant boiler efficiency obtaining function is implemented by control of the cpu.
As shown in fig. 8, the electronic device 9600 may further include: a communication module 9110, an input unit 9120, an audio processor 9130, a display 9160, and a power supply 9170. It is noted that the electronic device 9600 need not include all of the components shown in fig. 8; in addition, the electronic device 9600 may further include components not shown in fig. 8, and reference may be made to the related art.
As shown in fig. 8, the central processor 9100, sometimes referred to as a controller or operational control, may include a microprocessor or other processor device and/or logic device, which central processor 9100 receives inputs and controls the operation of the various components of the electronic device 9600.
The memory 9140 may be, for example, one or more of a buffer, a flash memory, a hard drive, a removable media, a volatile memory, a non-volatile memory, or other suitable device. The information about failure may be stored, and a program for executing the information may be stored. And the central processor 9100 can execute the program stored in the memory 9140 to realize information storage or processing, and the like.
The input unit 9120 provides input to the central processor 9100. The input unit 9120 is, for example, a key or a touch input device. The power supply 9170 is used to provide power to the electronic device 9600. The display 9160 is used for displaying display objects such as images and characters. The display may be, for example, but not limited to, an LCD display.
The memory 9140 may be a solid state memory such as Read Only Memory (ROM), random Access Memory (RAM), SIM card, etc. But also a memory which holds information even when powered down, can be selectively erased and provided with further data, an example of which is sometimes referred to as EPROM or the like. The memory 9140 may also be some other type of device. The memory 9140 includes a buffer memory 9141 (sometimes referred to as a buffer). The memory 9140 may include an application/function storage portion 9142, the application/function storage portion 9142 storing application programs and function programs or a flow for executing operations of the electronic device 9600 by the central processor 9100.
The memory 9140 may also include a data store 9143, the data store 9143 for storing data, such as contacts, digital data, pictures, sounds, and/or any other data used by an electronic device. The driver storage portion 9144 of the memory 9140 may include various drivers of the electronic device for communication functions and/or for performing other functions of the electronic device (e.g., messaging applications, address book applications, etc.).
The communication module 9110 is a transmitter/receiver 9110 that transmits and receives signals via an antenna 9111. A communication module (transmitter/receiver) 9110 is coupled to the central processor 9100 to provide input signals and receive output signals, as in the case of conventional mobile communication terminals.
Based on different communication technologies, a plurality of communication modules 9110, such as a cellular network module, a bluetooth module, and/or a wireless local area network module, etc., may be provided in the same electronic device. The communication module (transmitter/receiver) 9110 is also coupled to a speaker 9131 and a microphone 9132 via an audio processor 9130 to provide audio output via the speaker 9131 and to receive audio input from the microphone 9132 to implement usual telecommunications functions. The audio processor 9130 can include any suitable buffers, decoders, amplifiers and so forth. In addition, the audio processor 9130 is also coupled to the central processor 9100 so that sound can be recorded locally through the microphone 9132 and sound stored locally can be played through the speaker 9131.
The embodiments of the present application further provide a computer readable storage medium capable of implementing all the steps in the thermal power plant boiler efficiency obtaining method in the above embodiments, where the computer readable storage medium stores a computer program, and when the computer program is executed by a processor, the computer program implements all the steps in the thermal power plant boiler efficiency obtaining method in which the execution subject in the above embodiments is a server or a client, for example, the processor implements the following steps when executing the computer program:
Step 100: and judging whether an air preheater bypass connected with an outlet flue of a boiler furnace is arranged in the boiler of the current target thermal power plant, if so, setting a mixed flue between the outlet flue of the air preheater in the boiler of the target thermal power plant and the flue of the air preheater bypass as a target outlet boundary of the boiler of the target thermal power plant.
It can be understood that the specific mode of judging whether the current boiler of the target thermal power plant is provided with the air preheater bypass connected with the outlet flue of the boiler furnace may be that the server for implementing the method for obtaining the boiler efficiency of the thermal power plant sends the request for obtaining the boiler structure schematic diagram of the target thermal power plant to the corresponding client device, receives the boiler structure schematic diagram of the target thermal power plant sent by the client device, performs preprocessing on the boiler structure schematic diagram of the target thermal power plant, processes the boiler structure schematic diagram into a picture meeting the requirement of the preset format, performs text or symbol recognition on the boiler structure schematic diagram of the target thermal power plant, and judges whether the text or symbol related to the air preheater bypass is included according to the text or symbol recognition result, if the text or symbol exists, the air preheater bypass connected with the outlet flue of the boiler furnace is arranged in the current boiler of the target thermal power plant.
Step 200: and acquiring the values of all parameters in a preset water supply parameter set from the position between the bypass of the air preheater and the turbine side of the thermal power plant according to the target outlet boundary.
Step 300: and determining the heat loss of the air preheater bypass based on the values of the parameters in the water supply parameter set, and determining the heat loss of the air preheater bypass according to the heat loss of the air preheater bypass and the pre-acquired low-order heating value of the fuel entering the boiler.
Step 400: the heat loss of the air preheater bypass is added to the total heat loss of the boiler and the efficiency of the boiler is obtained based on the total heat loss of the boiler.
From the above description, it can be seen that the computer readable storage medium provided by the embodiment of the application can effectively improve the accuracy of acquiring the boiler efficiency of the thermal power plant with the air preheater bypass, and can effectively improve the automation degree and efficiency of the acquiring process of the boiler efficiency of the thermal power plant with the air preheater bypass, and further can effectively ensure the reliability and adjustment efficiency of the operation adjustment of the boiler of the thermal power plant based on the boiler efficiency of the thermal power plant, so that the power plant personnel can obtain the accurate boiler efficiency, technical references are provided for improving the boiler efficiency and performing proper combustion adjustment and evaluation analysis according to the boiler efficiency, and meanwhile, the economy of the transformation of the air preheater bypass flue of the power plant can be evaluated, and the reasonable transformation evaluation of the power plant can be guided.
It will be apparent to those skilled in the art that embodiments of the present invention may be provided as a method, apparatus, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (devices), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The principles and embodiments of the present invention have been described in detail with reference to specific examples, which are provided to facilitate understanding of the method and core ideas of the present invention; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present invention, the present description should not be construed as limiting the present invention in view of the above.
Claims (9)
1. A method for obtaining boiler efficiency of a thermal power plant, comprising:
judging whether an air preheater bypass connected with an outlet flue of a boiler furnace is arranged in a boiler of a current target thermal power plant, if so, setting a mixed flue between the outlet flue of the air preheater in the boiler of the target thermal power plant and the flue of the air preheater bypass as a target outlet boundary of the boiler of the target thermal power plant;
collecting values of various parameters in a preset water supply parameter set from between the bypass of the air preheater and the turbine side of the thermal power plant according to the target outlet boundary;
determining the heat loss of the air preheater bypass based on the values of the various parameters in the feedwater parameter set, and determining the heat loss of the air preheater bypass according to the heat loss of the air preheater bypass and the pre-acquired received base low-order heating value of the fuel entering the boiler;
adding the heat loss of the air preheater bypass to the total heat loss of the boiler and obtaining the efficiency of the boiler based on the total heat loss of the boiler;
the bypass of the air preheater comprises a high-pressure flue gas-water heat exchanger and a low-pressure flue gas-water heat exchanger which are connected with each other, the high-pressure flue gas-water heat exchanger is connected with an outlet flue of the boiler furnace, and the junction between the outlet flue of the low-pressure flue gas-water heat exchanger and the outlet flue of the air preheater is provided with the mixing flue;
Correspondingly, the step of setting the mixed flue between the outlet flue of the air preheater and the flue of the air preheater bypass in the target thermal power plant boiler as the target outlet boundary of the target thermal power plant boiler comprises the following steps:
determining an intersection point between an outlet flue of an air preheater in the target thermal power plant boiler and a flue of the air preheater bypass;
and selecting a mixing pipeline with a preset distance from the junction as a target outlet boundary of the target thermal power plant boiler, wherein the preset distance is larger than or equal to two times of the equivalent diameter of the outlet flue.
2. The method for obtaining the boiler efficiency of the thermal power plant according to claim 1, wherein the turbine side of the thermal power plant comprises a high-pressure heater group, a feed pump, a deaerator and a low-pressure heater group which are sequentially communicated;
the inlet of the high-pressure smoke-water heat exchanger is communicated with a water supply pipeline connected with the outlet of the water supply pump, and the outlet of the high-pressure smoke-water heat exchanger is communicated with an outlet pipeline of the high-pressure heater group;
an inlet of the low-pressure flue gas-water heat exchanger is communicated with a condensed water inlet flue of the low-pressure heater group, and an outlet of the low-pressure flue gas-water heat exchanger is connected between a condensed water outlet flue of the low-pressure heater group and an inlet flue of the deaerator;
Correspondingly, the step of collecting values of each parameter in a preset water supply parameter set from between the bypass of the air preheater and the turbine side of the thermal power plant according to the target outlet boundary comprises the following steps:
collecting an inlet feed water enthalpy value H of the high-pressure smoke-water heat exchanger from between an inlet of the high-pressure smoke-water heat exchanger and a feed water pipeline at an outlet of the feed water pump gy,en ；
Collecting an outlet feedwater enthalpy value H of the high-pressure flue gas-water heat exchanger from between an outlet of the high-pressure flue gas-water heat exchanger and an outlet pipeline of the high-pressure heater group gy,lv ；
Collecting the saidFeed water flow q in high pressure flue water heat exchanger m,gy ；
Collecting an inlet condensate enthalpy value H of the low-pressure flue gas-water heat exchanger from between an inlet of the low-pressure flue gas-water heat exchanger and a condensate inlet flue of the low-pressure heater group dy,en ；
Collecting an outlet condensate enthalpy value H of the low-pressure flue gas-water heat exchanger from between an outlet of the low-pressure flue gas-water heat exchanger and a condensate outlet flue of the low-pressure heater group dy,lv ；
Collecting the water supply flow q in the low-pressure flue-water heat exchanger m,dy 。
3. The method of claim 2, wherein the determining the lost heat of the air preheater bypass based on the values of the respective parameters of the set of feedwater parameters comprises:
Inlet feedwater enthalpy H based on the high-pressure flue-water heat exchanger gy,en The enthalpy value H of the feed water at the outlet of the high-pressure flue water heat exchanger gy,lv Feed water flow q in the high pressure flue water heat exchanger m,gy The enthalpy value H of inlet condensation water of the low-pressure flue-water heat exchanger dy,en The enthalpy value H of the condensed water at the outlet of the low-pressure flue gas water heat exchanger dy,lv And the feed water flow q in the low pressure flue water heat exchanger m,dy An air preheater bypass loss heat function is applied to determine the loss heat of the air preheater bypass.
4. A method of obtaining boiler efficiency in a thermal power plant according to claim 3, wherein the air preheater bypass loss heat function is shown in the following formula (1):
in formula (1), q m,f A fuel mass flow rate for entering the boiler; q (Q) pl The heat lost to bypass the air preheater.
5. The method of claim 4, wherein said determining the heat loss of the air preheater bypass based on the heat loss of the air preheater bypass and the pre-obtained received base low heat generation value of the fuel entering the boiler comprises:
heat loss Q according to the air preheater bypass pl And a pre-acquired received base low heat value Q of fuel entering the boiler net,ar Determining heat loss of the air preheater bypass based on a preset air preheater bypass heat loss function, wherein the air preheater bypass heat loss function is shown in the following formula (2):
in formula (2), q pl Heat loss bypassing the air preheater.
6. The method for obtaining efficiency of a thermal power plant boiler according to claim 5, wherein said adding heat loss of said air preheater bypass to total heat loss of said boiler and obtaining efficiency of the boiler based on the total heat loss of the boiler comprises:
based on pre-obtained heat loss q of exhaust gas, heat loss of incomplete combustion of solid, heat loss of heat dissipation of boiler, physical heat loss of ash and heat loss q of bypass of air preheater pl Determining a total heat loss of the boiler;
and determining the efficiency of the boiler by applying a preset heat loss method based on the total heat loss of the boiler and the received basic low-level heating value of the fuel entering the boiler.
7. A thermal power plant boiler efficiency acquisition device, comprising:
the target outlet boundary determining module is used for judging whether an air preheater bypass connected with an outlet flue of a boiler furnace is arranged in a current boiler of the target thermal power plant, if so, setting a mixed flue between the outlet flue of the air preheater in the boiler of the target thermal power plant and the flue of the air preheater bypass as a target outlet boundary of the boiler of the target thermal power plant;
The water supply parameter set acquisition module is used for acquiring the values of all parameters in a preset water supply parameter set from between the air preheater bypass and the turbine side of the thermal power plant according to the target outlet boundary;
an air preheater bypass heat loss acquisition module for determining a heat loss of the air preheater bypass based on the values of the respective parameters in the set of feedwater parameters, and determining a heat loss of the air preheater bypass based on the heat loss of the air preheater bypass and a pre-acquired received base low-level heat generation amount of fuel entering the boiler;
and the boiler efficiency acquisition module is used for adding the heat loss of the bypass of the air preheater to the total heat loss of the boiler and acquiring the efficiency of the boiler based on the total heat loss of the boiler.
8. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the thermal power plant boiler efficiency acquisition method of any one of claims 1 to 6 when the program is executed by the processor.
9. A computer-readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, realizes the steps of the thermal power plant boiler efficiency acquisition method according to any one of claims 1 to 6.
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