CN111507624A - 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 PDF

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CN111507624A
CN111507624A CN202010303910.2A CN202010303910A CN111507624A CN 111507624 A CN111507624 A CN 111507624A CN 202010303910 A CN202010303910 A CN 202010303910A CN 111507624 A CN111507624 A CN 111507624A
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air preheater
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water
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CN111507624B (en
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孙亦鹏
程亮
李金晶
张清峰
赵振宁
李媛园
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State Grid Corp of China SGCC
North China Electric Power Research Institute Co Ltd
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North China Electric Power Research Institute Co Ltd
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Abstract

The embodiment of the application provides a method and a device for acquiring boiler efficiency of a thermal power plant, wherein the method comprises the following steps: judging whether an air preheater bypass is arranged in a boiler of a 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 feeding parameter group between the air preheater bypass and the side of a steam turbine of the thermal power plant according to a target outlet boundary, determining the loss heat of the air preheater bypass, and determining the heat loss of the air preheater bypass according to the loss heat and the received base low-grade calorific 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. This application can effectively improve the accuracy of acquireing of the boiler efficiency of thermal power plant who has the air heater bypass, and can effectively improve the degree of automation and the efficiency of the acquisition process of the boiler efficiency of thermal power plant who has the air heater bypass.

Description

Method and device for acquiring boiler efficiency of thermal power plant
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 exhaust smoke of the boiler of the thermal power plant is the largest one of various heat losses of the boiler, and the deep utilization of the exhaust smoke waste heat of the boiler is significant. At present, the most common mode of thermal power plants in partial regions for flue gas waste heat utilization is to additionally arrange a flue gas waste heat utilization device at a tail flue of a boiler. Along with the continuous popularization of flue gas waste heat utilization equipment, various different flue gas waste heat utilization systems of arranging position and type obtain using gradually at thermal power plant, for example utilize flue gas waste heat direct heating condensate water, utilize flue gas waste heat heating circulating water and then utilize the heat exchanger to heat the condensate water, utilize flue gas waste heat heating circulating water and then heat the cold wind that gets into air heater to and utilize flue gas waste heat heating circulating water and then heat the flue gas that gets into the chimney etc.. Therefore, it is necessary to determine the boiler efficiency for 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 applied to a power plant. However, the traditional calculation of the efficiency of the utility boiler is calculated according to GB/T10184-2015 Performance Test procedure of the utility boiler or ASEM PTC4-2013 Fired Steel Generators Performance tests Codes, and the method is based on the dividing principle of the thermal balance system boundary calculated by the conventional pulverized coal power plant boiler efficiency, and does not consider the bypass of the air preheater, so that the accuracy of obtaining the boiler efficiency of the thermal power plant with the bypass of the air preheater cannot be ensured, and the reliability of adjusting the operation of the boiler of the thermal power plant based on the boiler efficiency of the thermal power plant cannot be ensured.
Disclosure of Invention
To the problems in the prior art, the application provides a method and a device for acquiring the boiler efficiency of a thermal power plant, which can effectively improve the acquisition accuracy of the boiler efficiency of the thermal power plant with an air preheater bypass, can effectively improve the automation degree and efficiency of the acquisition process of the boiler efficiency of the thermal power plant with the air preheater bypass, and further can effectively ensure the reliability and the adjustment efficiency of the operation adjustment of the boiler of the thermal power plant based on the boiler efficiency of the thermal power plant.
In order to solve the technical problem, 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 a flue of the air preheater bypass as a target outlet boundary of the boiler of the target thermal power plant;
collecting values of all parameters in a preset water feeding parameter group from between the air preheater bypass and the side of a steam turbine of the thermal power plant according to the target outlet boundary;
determining the heat loss of the air preheater bypass based on the value of each parameter in the group of water feeding parameters, 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 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.
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, the high-pressure flue gas-water heat exchanger is connected with an outlet flue of the boiler hearth, and the mixed 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 setting of the mixed flue between the outlet flue of the air preheater in the target thermal power plant boiler and the flue of the air preheater bypass as the target outlet boundary of the target thermal power plant boiler includes:
determining an intersection 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 part with a preset distance from the intersection point as a target outlet boundary of the target thermal power plant boiler, wherein the preset distance is more than or equal to twice the equivalent diameter of the outlet flue.
Further, the side of the steam turbine 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 and 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 and water heat exchanger is communicated with an outlet pipeline of the high-pressure heater group;
the inlet of the low-pressure smoke and water heat exchanger is communicated with a condensed water inlet flue of the low-pressure heater group, and the outlet of the low-pressure smoke and 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 collecting values of each parameter in the preset water supply parameter group between the air preheater bypass and the side of the steam turbine of the thermal power plant according to the target outlet boundary includes:
collecting the inlet water supply enthalpy value H of the high-pressure smoke-water heat exchanger between the inlet of the high-pressure smoke-water heat exchanger and the water supply pipeline at the outlet of the water supply pumpgy,en；
Collecting the outlet feed water enthalpy value H of the high-pressure smoke-water heat exchanger between the outlet of the high-pressure smoke-water heat exchanger and the outlet pipeline of the high-pressure heater groupgy,lv；
Collecting feed water flow q in the high-pressure smoke-water heat exchangerm,gy；
Collecting the enthalpy value H of the inlet condensed water of the low-pressure smoke-water heat exchanger between the inlet of the low-pressure smoke-water heat exchanger and the condensed water inlet flue of the low-pressure heater groupdy,en；
Collecting the enthalpy value H of outlet condensed water of the low-pressure smoke-water heat exchanger between the outlet of the low-pressure smoke-water heat exchanger and a condensed water outlet flue of the low-pressure heater groupdy,lv；
Collecting feed water flow q in the low-pressure smoke-water heat exchangerm,dy。
Further, the determining the heat lost by the air preheater bypass based on the values of each of the set of feedwater parameters comprises:
inlet feed water enthalpy value H based on high-pressure smoke-water heat exchangergy,enThe outlet feed water enthalpy value H of the high-pressure smoke-water heat exchangergy,lvThe water supply flow q in the high-pressure smoke-water heat exchangerm,gyAnd the enthalpy value H of the condensed water at the inlet of the low-pressure smoke-water heat exchangerdy,enAnd the enthalpy value H of outlet condensed water of the low-pressure smoke-water heat exchangerdy,lvAnd the feed water flow q in the low-pressure smoke-water heat exchangerm,dyDetermining the heat lost by the air preheater bypass using an air preheater bypass heat loss function.
Further, the air preheater bypass loss heat function is shown in equation (1) below:
Figure BDA0002455052980000031
in the formula (1), the first and second groups,qm,fis the fuel mass flow into the boiler; qplHeat loss bypassing the air preheater.
Further, determining the heat loss of the air preheater bypass based on the lost heat of the air preheater bypass and the pre-acquired received base lower heating value of the fuel entering the boiler comprises:
according to the heat loss Q of the air preheater bypassplAnd pre-acquired received base low calorific value Q of fuel entering the boilernet,arDetermining the 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):
Figure BDA0002455052980000041
in the formula (2), qplHeat 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:
according to the pre-acquired heat loss of the exhaust smoke of the boiler, the heat loss of incomplete combustion of gas, the heat loss of incomplete combustion of solid, the heat dissipation loss of the boiler, the physical heat loss of ash slag and the heat loss q of the air preheater bypassplDetermining a total heat loss of the boiler;
determining the efficiency of the boiler using a preset heat loss method based on the total heat loss of the boiler and the received base lower 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 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 a flue of the air preheater bypass as a target outlet boundary of the boiler of the target thermal power plant;
the water supply parameter group acquisition module is used for acquiring values of all parameters in a preset water supply parameter group from between the air preheater bypass and the side of the steam turbine of the thermal power plant according to the target outlet boundary;
an air preheater bypass heat loss acquisition module for determining the heat loss of the air preheater bypass based on the values of each parameter 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 heating value of the fuel entering the boiler;
and the boiler efficiency acquisition module is used for adding the heat loss of the air preheater bypass into 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, comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the method for obtaining efficiency of a boiler in a thermal power plant.
In a fourth aspect, the present application provides a computer readable storage medium having stored thereon a computer program which, when being executed by a processor, carries out the steps of the method for obtaining efficiency of a boiler of a thermal power plant.
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 a flue of the air preheater bypass as a target outlet boundary of the boiler of the target thermal power plant; collecting values of all parameters in a preset water feeding parameter group from between the air preheater bypass and the side of a steam turbine of the thermal power plant according to the target outlet boundary; determining the heat loss of the air preheater bypass based on the value of each parameter in the group of water feeding parameters, 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 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 efficiency of the boiler with the air preheater bypass in the thermal power plant can be effectively improved, and can effectively improve the automation degree and efficiency of the acquisition process of the boiler efficiency of the thermal power plant with the air preheater bypass, thereby effectively ensuring the reliability and the 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 personnel in the power plant can obtain accurate boiler efficiency, and provide technical reference for improving the boiler efficiency and the personnel in the power plant to carry out proper combustion adjustment and evaluation analysis according to the boiler efficiency, meanwhile, the economical efficiency of the power plant for reforming the bypass flue of the air preheater can be evaluated, and the power plant is guided to carry out reasonable reforming evaluation.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of the logical structure of the operation of a boiler of a target thermal power plant provided with an air preheater bypass connected to the exit flue of the boiler furnace in an embodiment of the present application.
Fig. 2 is a schematic flow chart of a method for acquiring boiler efficiency of a thermal power plant in an embodiment of the present application.
Fig. 3 is a schematic flow chart illustrating a specific process of step 100 in the method for obtaining efficiency of a boiler of a thermal power plant according to the embodiment of the present application.
Fig. 4 is a schematic specific flowchart of step 200 in the method for obtaining efficiency of a boiler of a thermal power plant in the embodiment of the present application.
Fig. 5 is a schematic flow chart illustrating a specific process 300 in the method for obtaining efficiency of a boiler of a thermal power plant according to the embodiment of the present application.
Fig. 6 is a schematic flow chart illustrating a specific step 400 in the method for obtaining efficiency of a boiler of a thermal power plant according to the embodiment of the present application.
Fig. 7 is a schematic structural diagram of a thermal power plant boiler efficiency acquisition device 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
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, 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 obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The traditional calculation of the efficiency of the utility boiler is calculated according to GB/T10184-2015 Performance Test regulations of the utility boiler or ASEM PTC4-2013 Fired Steel Generator Performance tests Codes, but the boundary for calculating the efficiency of the boiler is changed due to the application of the bypass flue gas waste heat utilization system of the air preheater, and the heat of the bypass flue gas of the air preheater is also used for heating the feed water, so that the method for calculating the efficiency of the boiler is changed. In order to solve the problem, the embodiment of the application provides a method for acquiring the boiler efficiency of a thermal power plant with an air preheater bypass, a device for acquiring the boiler efficiency of the thermal power plant, an electronic device and a computer readable storage medium, wherein whether the air preheater bypass connected with an outlet flue of a boiler furnace is arranged in a boiler of a current target thermal power plant is judged, and if yes, a mixed flue between the outlet flue of the air preheater in the boiler of the target thermal power plant and a flue of the air preheater bypass is set as a target outlet boundary of the boiler of the target thermal power plant; collecting values of all parameters in a preset water feeding parameter group from between the air preheater bypass and the side of a steam turbine of the thermal power plant according to the target outlet boundary; determining the heat loss of the air preheater bypass based on the value of each parameter in the group of water feeding parameters, 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 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 efficiency of the boiler with the air preheater bypass in the thermal power plant can be effectively improved, and can effectively improve the automation degree and efficiency of the acquisition process of the boiler efficiency of the thermal power plant with the air preheater bypass, thereby effectively ensuring the reliability and the 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 personnel in the power plant can obtain accurate boiler efficiency, and provide technical reference for improving the boiler efficiency and the personnel in the power plant to carry out proper combustion adjustment and evaluation analysis according to the boiler efficiency, meanwhile, the economical efficiency of the power plant for reforming the bypass flue of the air preheater can be evaluated, and the power plant is guided to carry out reasonable reforming evaluation.
In one or more embodiments of the present application, referring to fig. 1, a schematic diagram of an 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, cold primary air and cold secondary air entering the boiler are first heated by a primary air heater and a secondary air heater, wherein a heat source of the primary air heater and the secondary air heater is hot water from a #7 low-heating outlet of a turbine side of the power plant, and the hot water heats the cold primary air and the cold secondary air and then returns to a #8 low-heating inlet; the heat of the smoke absorbed by the cold primary air and the cold secondary air in the air preheater is changed into hot primary air and hot secondary air, the smoke is discharged into smoke with lower temperature after releasing the heat in the air preheater, a part of cold primary air is converged with the hot primary air after not entering the air preheater and enters a coal mill, and fuel in the coal mill is conveyed into a boiler furnace together. After having increased the air heater bypass, a part of flue gas splits in air heater import flue and gets into the air heater bypass, join with the exhaust flue gas of air heater again behind high-pressure cigarette water heat exchanger and low pressure cigarette water heat exchanger, wherein the by heating medium among the high-pressure cigarette water heat exchanger is the feedwater of feedwater pump export, get into the export that #1 height adds after the heating, by heating medium among the low pressure cigarette water heat exchanger for #6 low with the mixed condensate water of #5 low with the import, get into the export that #5 hangs down after the heating.
It is to be understood that reference to low plus in one or more embodiments of the present application refers to a low pressure heater and high plus refers to a high pressure heater, for example, the #5 low plus inlet specifically refers to the inlet of the low pressure heater numbered # 5.
In one or more embodiments of the present application, each of the parameters in the set of water supply parameters specifically includes:
(1) the inlet feed water enthalpy value H of the high-pressure smoke-water heat exchangergy,en；
(2) The outlet feed water enthalpy value H of the high-pressure smoke-water heat exchangergy,lv；
(3) Feed water flow q in the high-pressure smoke-water heat exchangerm,gy；
(4) The enthalpy value H of the condensed water at the inlet of the low-pressure smoke-water heat exchangerdy,en；
(5) The enthalpy value H of outlet condensed water of the low-pressure smoke-water heat exchangerdy,lv；
(6) Feed water flow q in the low-pressure smoke-water heat exchangerm,dy。
Referring to FIG. 1, where the received base lower heating value of the fuel is Qnet,arMass flow of fuel qm,f. After the air preheater bypass is added, a part of smoke is divided out in an inlet flue of the air preheater to enter the air preheater bypass, and then is converged with the smoke discharged by the air preheater after passing through a high-pressure smoke-water heat exchanger and a low-pressure smoke-water heat exchanger, wherein a heated medium in the high-pressure smoke-water heat exchanger is the feed water of an outlet of a feed water pump, and enters an outlet with high pressure of #1 after being heated, and the enthalpy value of the feed water entering the high-pressure smoke-water heat exchanger is Hgy,enHigh pressure cigaretteThe enthalpy value of the feed water at the outlet of the water heat exchanger is Hgy,lvThe feed water flow passing through the high-pressure smoke-water heat exchanger is qm,gy(ii) a The heated medium in the low-pressure smoke-water heat exchanger is mixed condensed water of a #6 low-pressure inlet and a #5 low-pressure inlet, the heated condensed water enters a #5 low-pressure inlet, and the enthalpy value of the condensed water entering the low-pressure smoke-water heat exchanger is Hdy,enThe enthalpy value of condensed water at the outlet of the low-pressure smoke-water heat exchanger is Hdy,lvThe flow of the condensed water flowing through the low-pressure smoke-water heat exchanger is qm,dy。
According to the principle of dividing the boundary of a heat balance system for calculating the efficiency of a conventional pulverized coal power station boiler in GB/T10184-2015 power station boiler Performance Test regulations or ASEM PTC4-2013 Fired steam generators Performance Codes, the inlet boundary of a boiler air-smoke system is generally fixed at the cold primary air inlet and the secondary air inlet of an air preheater (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 fixed at the smoke outlet of the air preheater (namely, the outlet boundary 1 in figure 1), and the composition and the temperature of smoke are measured at the outlet boundary by using the grid method. The flue gas waste heat utilization system of the air preheater bypass is arranged in parallel with the air preheater, the outlet boundary of the system is changed from the original flue gas outlet (the outlet boundary 1 in figure 1) of the air preheater to the position behind the mixed flue of the air preheater and the bypass flue (the outlet boundary 2 in figure 1), and the measuring point position for measuring the flue gas components and the temperature is at least 2D (D is the equivalent diameter of the outlet flue of the air preheater) away from the flue junction. This also marks the air preheater bypass within the heat balance system boundary.
Based on the above, in order to effectively improve the accuracy of obtaining the boiler efficiency of the thermal power plant with the air preheater bypass, and effectively improve the automation degree and efficiency of the obtaining process of the boiler efficiency of the thermal power plant with the air preheater bypass, and further effectively ensure the reliability and the adjustment efficiency of the boiler operation adjustment of the thermal power plant based on the boiler efficiency of the thermal power plant, the application provides an embodiment of the boiler efficiency obtaining method of the thermal power plant, see fig. 2, the boiler efficiency obtaining method of the thermal power plant specifically includes the following contents:
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 a 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 way of determining whether the air preheater bypass connected to the outlet flue of the boiler furnace is provided in the boiler of the current target thermal power plant may be, the server for realizing the thermal power plant boiler efficiency acquisition method sends a boiler structure schematic diagram acquisition request of a target thermal power plant to corresponding client equipment and receives the boiler structure schematic diagram of the target thermal power plant sent by the client equipment, preprocessing the boiler structure schematic diagram of the target thermal power plant, processing the boiler structure schematic diagram into pictures meeting the requirements of a preset format, then, character or symbol recognition is carried out on the boiler structure schematic diagram of the target thermal power plant, whether characters or symbols related to the air preheater bypass are contained in the boiler structure schematic diagram is judged according to the character or symbol recognition result, if the characters or symbols exist, and judging that 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.
Step 200: and collecting values of all parameters in a preset water feeding parameter group from between the air preheater bypass and the side of the steam turbine of the thermal power plant according to the target outlet boundary.
Step 300: determining a heat loss of the air preheater bypass based on values of each of 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 predicted received base lower heating value of the fuel entering the boiler.
Step 400: 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.
In one or more embodiments of the present application, the air preheater bypass includes 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 an outlet flue of the boiler furnace, and a 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 boiler efficiency of the thermal power plant with the air preheater bypass, in an embodiment of the method for obtaining the boiler efficiency of the thermal power plant provided by the present application, referring to fig. 3, step 100 in the method for obtaining the boiler efficiency of the thermal power plant specifically includes the following contents:
step 101: determining a junction 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 part with a preset distance from the intersection point as a target outlet boundary of the target thermal power plant boiler, wherein the preset distance is more than or equal to twice 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 feed water pump, a deaerator, and a low-pressure heater group, which are sequentially communicated; the inlet of the high-pressure smoke and 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 and water heat exchanger is communicated with an outlet pipeline of the high-pressure heater group; the inlet of the low-pressure smoke and water heat exchanger is communicated with a condensed water inlet flue of the low-pressure heater group, and the outlet of the low-pressure smoke and water heat exchanger is connected between a condensed water outlet flue of the low-pressure heater group and an inlet flue of the deaerator.
Based on this, in order to effectively improve the acquisition efficiency and reliability of the values of each parameter in the feedwater parameter set, so as to further improve the accuracy of acquiring the boiler efficiency of the thermal power plant with the air preheater bypass, in an embodiment of the method for acquiring the boiler efficiency of the thermal power plant provided by the present application, referring to fig. 4, step 200 in the method for acquiring the boiler efficiency of the thermal power plant specifically includes the following contents:
step 201: collecting the inlet water supply enthalpy value H of the high-pressure smoke-water heat exchanger between the inlet of the high-pressure smoke-water heat exchanger and the water supply pipeline at the outlet of the water supply pumpgy,en。
Step 202: collecting the outlet feed water enthalpy value H of the high-pressure smoke-water heat exchanger between the outlet of the high-pressure smoke-water heat exchanger and the outlet pipeline of the high-pressure heater groupgy,lv。
Step 203: collecting feed water flow q in the high-pressure smoke-water heat exchangerm,gy。
Step 204: collecting the enthalpy value H of the inlet condensed water of the low-pressure smoke-water heat exchanger between the inlet of the low-pressure smoke-water heat exchanger and the condensed water inlet flue of the low-pressure heater groupdy,en。
Step 205: collecting the enthalpy value H of outlet condensed water of the low-pressure smoke-water heat exchanger between the outlet of the low-pressure smoke-water heat exchanger and a condensed water outlet flue of the low-pressure heater groupdy,lv。
Step 206: collecting feed water flow q in the low-pressure smoke-water heat exchangerm,dy。
It should be understood that the execution sequence of the steps 201 to 206 is only an example, and in practical applications, the execution sequence of the steps 201 to 206 may be any sequence or simultaneously, and the present application is not limited thereto.
In order to effectively improve the accuracy of obtaining the heat loss of the air preheater bypass and further improve the accuracy of obtaining the boiler efficiency of the thermal power plant with the air preheater bypass, in an embodiment of the method for obtaining the boiler efficiency of the thermal power plant provided by the present application, referring to fig. 5, step 300 in the method for obtaining the boiler efficiency of the thermal power plant specifically includes the following steps:
step 301: inlet feed water enthalpy value H based on high-pressure smoke-water heat exchangergy,enThe outlet feed water enthalpy value H of the high-pressure smoke-water heat exchangergy,lvThe water supply flow q in the high-pressure smoke-water heat exchangerm,gyAnd the enthalpy value H of the condensed water at the inlet of the low-pressure smoke-water heat exchangerdy,enAnd the enthalpy value H of outlet condensed water of the low-pressure smoke-water heat exchangerdy,lvAnd the feed water flow q in the low-pressure smoke-water heat exchangerm,dyDetermining the heat lost by the air preheater bypass using an air preheater bypass heat loss function.
Wherein the air preheater bypass loss heat function is as shown in equation (1):
Figure BDA0002455052980000111
in the formula (1), qm,fIs the fuel mass flow into the boiler; qplHeat loss bypassing the air preheater.
In order to effectively improve the accuracy of obtaining the heat loss of the air preheater bypass and further improve the accuracy of obtaining the boiler efficiency of the thermal power plant with the air preheater bypass, in an embodiment of the method for obtaining the boiler efficiency of the thermal power plant provided by the present application, referring to fig. 5, step 300 in the method for obtaining the boiler efficiency of the thermal power plant further includes the following steps:
step 302: according to the heat loss Q of the air preheater bypassplAnd pre-acquired received base low calorific value Q of fuel entering the boilernet,arDetermining 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 as shown in equation (2) below:
Figure BDA0002455052980000112
in the formula (2), qplHeat loss bypassing the air preheater.
The accuracy of obtaining of the boiler efficiency of the thermal power plant with the air preheater bypass is effectively improved, and the automation degree 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, in an embodiment of the boiler efficiency obtaining method of the thermal power plant provided by the application, referring to fig. 6, step 400 in the boiler efficiency obtaining method of the thermal power plant specifically includes the following contents:
step 401: according to the pre-acquired heat loss of the exhaust smoke of the boiler, the heat loss of incomplete combustion of gas, the heat loss of incomplete combustion of solid, the heat dissipation loss of the boiler, the physical heat loss of ash slag and the heat loss q of the air preheater bypassplDetermining a total heat loss of the boiler.
Step 402: determining the efficiency of the boiler using a preset heat loss method based on the total heat loss of the boiler and the received base lower 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 power station boiler Performance Test regulations or ASEM PTC4-2013 Fine Steel Generator Performance Test Codes, an inverse equilibrium 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:
Figure BDA0002455052980000121
in formula (3):
η -boiler efficiency,%;
Qnet,ar-the received base lower heating value of the fuel entering the boiler is obtained by testing the fuel, kJ/kg;
Qex-heat input to the system boundary, kJ/kg; the calculation method can refer to GB/T10184-2015 'test procedure for boiler performance of power station'.
Qloss-total boiler loss, kJ/kg; the method generally comprises the heat loss of exhaust smoke, the heat loss of incomplete combustion of gas, the heat loss of incomplete combustion of solid, the heat dissipation loss of a boiler, the physical heat loss of ash and other heat losses, and the calculation method of each loss can refer to GB/T10184-2015 power station boiler performance test regulations.
However, the method for calculating the boiler efficiency of the utility boiler system with the air preheater bypass is not shown in GB/T10184-2015 'test procedure for the performance of the utility boiler', so the method cannot be referred to and executed in the test and calculation of the efficiency of the utility boiler with the air preheater bypass.
The heat of the flue gas in the air preheater bypass to heat the condensate and feedwater should be accounted for as part of the other heat losses to the boiler, as this heat is not used to heat the media in the boiler heat balance system, such as cold air, etc., and this loss is calculated by the following equation:
Figure BDA0002455052980000122
in formula (2):
qpl-air preheater bypass heat loss,%;
Qpl-the heat lost by the air preheater bypass, kJ/kg, calculated from the following equation:
Figure BDA0002455052980000131
in formula (1):
qm,gythe water flow in the high-pressure smoke-water heat exchanger is kg/h;
Hgy,lv-the outlet of the high pressure flue gas-water heat exchanger feeds water enthalpy value, kJ/kg;
Hgy,en-the inlet feed water enthalpy of the high pressure flue gas water heat exchanger, kJ/kg;
qm,dythe flow of the condensed water in the low-pressure smoke-water heat exchanger is kg/h;
Hdy,lv-the enthalpy value of the condensed water at the outlet of the low-pressure flue gas-water heat exchanger, kJ/kg;
Hdy,en-the enthalpy value of condensed water at the inlet of the low-pressure flue gas-water heat exchanger, kJ/kg;
qm,f-mass flow of fuel into the boiler, kg/h.
As can be seen from the above description, the method for obtaining the boiler efficiency of the thermal power plant provided by the embodiment of the present application includes the following steps:
content 1: the utility boiler efficiency calculation boundary with the air preheater bypass flue is changed from the air preheater flue gas outlet (at outlet boundary 1 in fig. 1) to after the mixing flue of the air preheater and the bypass flue (at outlet boundary 2 in fig. 1), and where the flue gas composition and temperature are measured for boiler efficiency calculation, the point 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 the condensate or feed water for the air preheater bypass flue is calculated as follows:
Figure BDA0002455052980000132
in formula (2):
qpl-air preheater bypass heat loss,%;
Qnet,ar-the received base lower heating value of the fuel entering the boiler is obtained by testing the fuel, kJ/kg;
Qpl-the heat lost by the air preheater bypass, kJ/kg, calculated from the following equation:
Figure BDA0002455052980000133
in formula (1):
qm,gythe water flow in the high-pressure smoke-water heat exchanger is kg/h;
Hgy,lv-the outlet of the high pressure flue gas-water heat exchanger feeds water enthalpy value, kJ/kg;
Hgy,en-the inlet feed water enthalpy of the high pressure flue gas water heat exchanger, kJ/kg;
qm,dythe flow of the condensed water in the low-pressure smoke-water heat exchanger is kg/h;
Hdy,lv-the enthalpy value of the condensed water at the outlet of the low-pressure flue gas-water heat exchanger, kJ/kg;
Hdy,en-the enthalpy value of condensed water at the inlet of the low-pressure flue gas-water heat exchanger, kJ/kg;
qm,f-mass flow of fuel into the boiler, kg/h.
Based on the above contents 1 and 2, the present application example analyzes the calculation method of the utility boiler efficiency with the air preheater bypass flue, and provides a calculation method of the calculation boundary of the utility boiler efficiency with the air preheater bypass flue and the boiler heat loss. Utilize this patent method can instruct to have the power station boiler efficiency of air heater bypass flue to detect and calculate, can be used to the detection analysis and the check and check of boiler efficiency for the personnel of power plant obtain accurate boiler efficiency, for improving boiler efficiency and power plant personnel and carrying out suitable burning adjustment and evaluation analysis according to boiler efficiency and provide technical reference, also can carry out the economic nature of air heater bypass flue transformation to the power plant and evaluate, instruct the power plant to carry out reasonable transformation aassessment.
From the software aspect, in order to effectively improve the accuracy of obtaining of the boiler efficiency of the thermal power plant that has the air heater bypass, and can effectively improve degree of automation and the efficiency of the process of obtaining of the boiler efficiency of the thermal power plant that has the air heater bypass, and then can effectively guarantee to carry out reliability and adjustment efficiency that the boiler operation of the thermal power plant was adjusted based on boiler efficiency of the thermal power plant, this application still provides one kind and is used for realizing the boiler efficiency of the thermal power plant of whole or branch content obtains the embodiment of the boiler efficiency of the thermal power plant obtaining device in the boiler efficiency of the thermal power plant obtaining method, refer to fig. 7, the boiler efficiency of the thermal power plant obtaining device specifically includes following content:
a target outlet boundary determining module 10, configured to determine whether an air preheater bypass connected to an outlet flue of a boiler furnace is arranged in a current boiler of a target thermal power plant, and if so, set a mixed flue between the outlet flue of the air preheater in the boiler of the target thermal power plant and a 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 each parameter in a preset feedwater parameter set from between the air preheater bypass 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 each of 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 lower heating value of the fuel entering the boiler;
a boiler efficiency acquisition module 40 for adding the heat loss of the air preheater bypass to the total heat loss of the boiler and acquiring the efficiency of the boiler based on the total heat loss of the boiler.
The specific implementation content of the thermal power plant boiler efficiency obtaining device provided by the embodiment of the application refers to the embodiment of the thermal power plant boiler efficiency obtaining method, and is not repeated here.
Can know from the above-mentioned description, the boiler efficiency of thermal power plant acquisition device that this application embodiment provided, can effectively improve the accuracy of acquireing of the boiler efficiency of thermal power plant who has the air heater bypass, and can effectively improve the degree of automation and the efficiency of the process of acquireing of the boiler efficiency of thermal power plant who has the air heater bypass, and then can effectively guarantee to carry out reliability and adjustment efficiency of thermal power plant's boiler operation adjustment based on boiler efficiency of thermal power plant, make the personnel of power plant obtain accurate boiler efficiency, it provides technical reference to carry out suitable burning adjustment and evaluation analysis according to boiler efficiency for improving boiler efficiency and power plant personnel, also can evaluate the economic nature that air heater bypass flue reformed transform to the power plant simultaneously, guide the power plant to carry out reasonable transformation aassessment.
From the hardware aspect, in order to improve the accuracy of obtaining of the boiler efficiency of the thermal power plant who has the air heater bypass, and can effectively improve degree of automation and the efficiency of the process of obtaining of the boiler efficiency of the thermal power plant who has the air heater bypass, and then can effectively guarantee to carry out reliability and adjustment efficiency that the boiler operation of the thermal power plant was adjusted based on boiler efficiency of the thermal power plant, this application provides an embodiment for realizing the electronic equipment of whole or partial content in the boiler efficiency of the thermal power plant acquisition method, electronic equipment specifically includes following content:
a processor (processor), a memory (memory), a communication Interface (Communications Interface), and a bus; the processor, the memory and the communication interface complete mutual communication through the bus; the communication interface is used for realizing information transmission between the electronic equipment and the user terminal and relevant equipment such as a relevant database and the like; the electronic device may be a desktop computer, a tablet computer, a mobile terminal, and the like, but the embodiment is not limited thereto. In this embodiment, the electronic device may be implemented with reference to the embodiment of the method for acquiring boiler efficiency of a thermal power plant and the embodiment of the device for acquiring boiler efficiency of a thermal power plant in the embodiment, and the contents thereof are incorporated herein, and repeated details are not repeated.
Fig. 8 is a schematic block diagram of a system configuration of an electronic device 9600 according to an embodiment of the present application. As shown in fig. 8, the electronic device 9600 can 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 structure to implement telecommunications or other functions.
In one embodiment, the thermal power plant boiler efficiency acquisition function may be integrated into a 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 a 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 way of determining whether the air preheater bypass connected to the outlet flue of the boiler furnace is provided in the boiler of the current target thermal power plant may be, the server for realizing the thermal power plant boiler efficiency acquisition method sends a boiler structure schematic diagram acquisition request of a target thermal power plant to corresponding client equipment and receives the boiler structure schematic diagram of the target thermal power plant sent by the client equipment, preprocessing the boiler structure schematic diagram of the target thermal power plant, processing the boiler structure schematic diagram into pictures meeting the requirements of a preset format, then, character or symbol recognition is carried out on the boiler structure schematic diagram of the target thermal power plant, whether characters or symbols related to the air preheater bypass are contained in the boiler structure schematic diagram is judged according to the character or symbol recognition result, if the characters or symbols exist, and judging that 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.
Step 200: and collecting values of all parameters in a preset water feeding parameter group from between the air preheater bypass and the side of the steam turbine of the thermal power plant according to the target outlet boundary.
Step 300: determining a heat loss of the air preheater bypass based on values of each of 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 predicted received base lower heating value of the fuel entering the boiler.
Step 400: 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.
According to the above description, the electronic equipment that this application embodiment provided, can effectively improve the accuracy of acquireing of the boiler efficiency of the thermal power plant who has the air heater bypass, and can effectively improve the degree of automation and the efficiency of the process of acquireing of the boiler efficiency of the thermal power plant who has the air heater bypass, and then can effectively guarantee to carry out reliability and adjustment efficiency of thermal power plant's boiler operation adjustment based on boiler efficiency of thermal power plant, make the personnel of power plant obtain accurate boiler efficiency, carry out suitable burning adjustment and evaluation analysis according to boiler efficiency for improving boiler efficiency and power plant personnel and provide technical reference, also can evaluate the economic nature that the air heater bypass flue was reformed transform to the power plant simultaneously, guide the power plant to carry out reasonable transformation aassessment.
In another embodiment, the thermal power plant boiler efficiency obtaining device may be configured separately from the central processing unit 9100, for example, the thermal power plant boiler efficiency obtaining device may be configured as a chip connected to the central processing unit 9100, and the thermal power plant boiler efficiency obtaining function is realized by the control of the central processing unit.
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 also does not necessarily include all of the components shown in fig. 8; further, the electronic device 9600 may further include components not shown in fig. 8, which may be referred to in the art.
As shown in fig. 8, a central processor 9100, sometimes referred to as a controller or operational control, can include a microprocessor or other processor device and/or logic device, which central processor 9100 receives input and controls the operation of the various components of the electronic device 9600.
The memory 9140 can 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 relating to the failure may be stored, and a program for executing the information may be stored. And the central processing unit 9100 can execute the program stored in the memory 9140 to realize information storage or processing, or the like.
An input unit 9120 provides input to the cpu 9100, the input unit 9120 is, for example, a key or a touch input device, a power supply 9170 supplies power to the electronic apparatus 9600, a display 9160 displays display objects such as images and characters, and the display may be, for example, an L CD display, but is not limited thereto.
The memory 9140 can be a solid state memory, e.g., Read Only Memory (ROM), Random Access Memory (RAM), a SIM card, or the like. There may also be a memory that holds information even when power is off, can be selectively erased, and is provided with more data, an example of which is sometimes called an EPROM or the like. The memory 9140 could also be some other type of device. 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 being used for storing application programs and function programs or for executing a flow of operations of the electronic device 9600 by the central processor 9100.
The memory 9140 can also include a data store 9143, the data store 9143 being used to store 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 for the electronic device for communication functions and/or for performing other functions of the electronic device (e.g., messaging applications, contact book applications, etc.).
The communication module 9110 is a transmitter/receiver 9110 that transmits and receives signals via an antenna 9111. The communication module (transmitter/receiver) 9110 is coupled to the central processor 9100 to provide input signals and receive output signals, which may be the same as in the case of a conventional mobile communication terminal.
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, 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 receive audio input from the microphone 9132, thereby implementing ordinary telecommunications functions. The audio processor 9130 may include any suitable buffers, decoders, amplifiers and so forth. In addition, the audio processor 9130 is also coupled to the central processor 9100, thereby enabling recording locally through the microphone 9132 and enabling locally stored sounds to be played through the speaker 9131.
An embodiment of the present application further provides a computer-readable storage medium capable of implementing all the steps in the method for acquiring boiler efficiency of a thermal power plant in the foregoing embodiment, 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 of the method for acquiring boiler efficiency of a thermal power plant, where the execution subject of the computer program is a server or a client, for example, when the processor executes the computer program, the processor implements 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 a 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 way of determining whether the air preheater bypass connected to the outlet flue of the boiler furnace is provided in the boiler of the current target thermal power plant may be, the server for realizing the thermal power plant boiler efficiency acquisition method sends a boiler structure schematic diagram acquisition request of a target thermal power plant to corresponding client equipment and receives the boiler structure schematic diagram of the target thermal power plant sent by the client equipment, preprocessing the boiler structure schematic diagram of the target thermal power plant, processing the boiler structure schematic diagram into pictures meeting the requirements of a preset format, then, character or symbol recognition is carried out on the boiler structure schematic diagram of the target thermal power plant, whether characters or symbols related to the air preheater bypass are contained in the boiler structure schematic diagram is judged according to the character or symbol recognition result, if the characters or symbols exist, and judging that 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.
Step 200: and collecting values of all parameters in a preset water feeding parameter group from between the air preheater bypass and the side of the steam turbine of the thermal power plant according to the target outlet boundary.
Step 300: determining a heat loss of the air preheater bypass based on values of each of 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 predicted received base lower heating value of the fuel entering the boiler.
Step 400: 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.
According to the computer readable storage medium provided by the embodiment of the application, the accuracy of obtaining of the boiler efficiency of the thermal power plant with the air preheater bypass can be effectively improved, the automation degree and the efficiency of the process of obtaining of the boiler efficiency of the thermal power plant with the air preheater bypass can be effectively improved, and then the reliability and the adjustment efficiency of adjusting the boiler operation of the thermal power plant based on the boiler efficiency of the thermal power plant can be effectively guaranteed, so that power plant personnel can obtain accurate boiler efficiency, technical reference is provided for improving the boiler efficiency and carrying out proper combustion adjustment and evaluation analysis according to the boiler efficiency by the power plant personnel, meanwhile, the economy of the air preheater bypass flue reformation of the power plant can be evaluated, and the power plant is guided to carry out reasonable reformation and evaluation.
As will be appreciated by one skilled in the art, 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 flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams 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 principle and the implementation mode of the invention are explained by applying specific embodiments in the invention, and the description of the embodiments is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims (10)

1. A method for acquiring boiler efficiency of a thermal power plant is characterized by comprising 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 a flue of the air preheater bypass as a target outlet boundary of the boiler of the target thermal power plant;
collecting values of all parameters in a preset water feeding parameter group from between the air preheater bypass and the side of a steam turbine of the thermal power plant according to the target outlet boundary;
determining the heat loss of the air preheater bypass based on the value of each parameter in the group of water feeding parameters, 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 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.
2. The method for acquiring the boiler efficiency of the thermal power plant according to claim 1, wherein 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, 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 a junction between the outlet flue of the low-pressure flue gas-water heat exchanger and the outlet flue of the air preheater;
correspondingly, the setting of the mixed flue between the outlet flue of the air preheater in the target thermal power plant boiler and the flue of the air preheater bypass as the target outlet boundary of the target thermal power plant boiler includes:
determining an intersection 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 part with a preset distance from the intersection point as a target outlet boundary of the target thermal power plant boiler, wherein the preset distance is more than or equal to twice the equivalent diameter of the outlet flue.
3. The method for acquiring the boiler efficiency of the thermal power plant as recited in claim 2, wherein the turbine side of the thermal power plant comprises a high-pressure heater group, a feed water pump, a deaerator and a low-pressure heater group which are communicated in sequence;
the inlet of the high-pressure smoke and 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 and water heat exchanger is communicated with an outlet pipeline of the high-pressure heater group;
the inlet of the low-pressure smoke and water heat exchanger is communicated with a condensed water inlet flue of the low-pressure heater group, and the outlet of the low-pressure smoke and 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 collecting values of each parameter in the preset water supply parameter group between the air preheater bypass and the side of the steam turbine of the thermal power plant according to the target outlet boundary includes:
collecting the inlet water supply enthalpy value H of the high-pressure smoke-water heat exchanger between the inlet of the high-pressure smoke-water heat exchanger and the water supply pipeline at the outlet of the water supply pumpgy,en；
Collecting the outlet feed water enthalpy value H of the high-pressure smoke-water heat exchanger between the outlet of the high-pressure smoke-water heat exchanger and the outlet pipeline of the high-pressure heater groupgy,lv；
Collecting feed water flow q in the high-pressure smoke-water heat exchangerm,gy；
Collecting the enthalpy value H of the inlet condensed water of the low-pressure smoke-water heat exchanger between the inlet of the low-pressure smoke-water heat exchanger and the condensed water inlet flue of the low-pressure heater groupdy,en；
Collecting the enthalpy value H of outlet condensed water of the low-pressure smoke-water heat exchanger between the outlet of the low-pressure smoke-water heat exchanger and a condensed water outlet flue of the low-pressure heater groupdy,lv；
Collecting feed water flow q in the low-pressure smoke-water heat exchangerm,dy。
4. The method of claim 3, wherein the determining the amount of heat lost by the air preheater bypass based on the values of each of the set of feedwater parameters comprises:
inlet feed water enthalpy value H based on high-pressure smoke-water heat exchangergy,enThe outlet feed water enthalpy value H of the high-pressure smoke-water heat exchangergy, l vThe water supply flow q in the high-pressure smoke-water heat exchangerm,gyAnd the enthalpy value H of the condensed water at the inlet of the low-pressure smoke-water heat exchangerdy,enAnd the enthalpy value H of outlet condensed water of the low-pressure smoke-water heat exchangerdy,lvAnd said lowFeed water flow q in smoke-pressing water heat exchangerm,dyDetermining the heat lost by the air preheater bypass using an air preheater bypass heat loss function.
5. The method for obtaining boiler efficiency of a thermal power plant according to claim 4, wherein the air preheater bypass loss heat function is as shown in equation (1) below:
Figure FDA0002455052970000021
in the formula (1), qm,fIs the fuel mass flow into the boiler; qplHeat loss bypassing the air preheater.
6. The method for deriving boiler efficiency for a thermal power plant according to claim 5, wherein said determining heat loss from the air preheater bypass based on the heat lost from the air preheater bypass and the pre-derived received base lower calorific value of the fuel entering the boiler comprises:
according to the heat loss Q of the air preheater bypassplAnd pre-acquired received base low calorific value Q of fuel entering the boilernet,arDetermining the 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):
Figure FDA0002455052970000031
in the formula (2), qplHeat loss bypassing the air preheater.
7. The method for obtaining the efficiency of a heat-engine plant boiler according to claim 6, wherein 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:
according to the pre-acquired heat loss of the exhaust smoke of the boiler, the heat loss of incomplete combustion of gas, the heat loss of incomplete combustion of solid, the heat dissipation loss of the boiler, the physical heat loss of ash slag and the heat loss q of the air preheater bypassplDetermining a total heat loss of the boiler;
determining the efficiency of the boiler using a preset heat loss method based on the total heat loss of the boiler and the received base lower heating value of the fuel entering the boiler.
8. A thermal power plant boiler efficiency acquisition device, characterized by 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 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 a flue of the air preheater bypass as a target outlet boundary of the boiler of the target thermal power plant;
the water supply parameter group acquisition module is used for acquiring values of all parameters in a preset water supply parameter group from between the air preheater bypass and the side of the steam turbine of the thermal power plant according to the target outlet boundary;
an air preheater bypass heat loss acquisition module for determining the heat loss of the air preheater bypass based on the values of each parameter 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 heating value of the fuel entering the boiler;
and the boiler efficiency acquisition module is used for adding the heat loss of the air preheater bypass into the total heat loss of the boiler and acquiring the efficiency of the boiler based on the total heat loss of the boiler.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor when executing the program performs the steps of the method for obtaining efficiency of a boiler of a thermal power plant according to any one of claims 1 to 7.
10. A computer-readable storage medium, having a computer program stored thereon, wherein the computer program, when being executed by a processor, is adapted to carry out the steps of the method for obtaining an efficiency of a boiler of a thermal power plant according to any one of the claims 1 to 7.
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