Method and device for measuring efficiency of power station boiler using fan coal mill

Abstract

The embodiment of the present application provides a method and device for measuring the efficiency of a power station boiler using a fan coal mill, the method comprising: determining the total heat loss of the boiler based on the exhaust heat loss of the power station boiler using a fan coal mill, the heat loss of gas incomplete combustion, the heat loss of solid incomplete combustion, the heat loss of boiler heat dissipation, and the physical heat loss of ash collected within a set period; determining the input system heat based on the heat of air entering the air preheater, the heat of circulating flue gas on the flue behind the circulating fan, and the physical sensible heat of the raw coal; determining the boiler efficiency based on the total heat loss of the boiler, the input system heat, and the received low calorific value of the coal; the present application can accurately measure the efficiency of the power station boiler using a fan coal mill, so as to improve the economy of the power station boiler operation, and provide supporting data for the design and manufacture, operation optimization, and energy conservation and emission reduction of electric boilers using fan mills.

Description

Technical Field

[0001] The present application relates to the field of energy management, and in particular to a method and device for measuring the efficiency of a power station boiler using a fan coal mill. Background Art

[0002] In recent years, with the widespread use of lignite as thermal coal for thermal power generation, boiler problems caused by the high moisture content of lignite have become increasingly prominent. Some new technologies, such as power station boiler technology using fan pulverizers, have begun to be applied in my country, promoting the application of lignite in thermal power units, namely, the air and smoke system of power station boilers using fan pulverizers.

[0003] The main difference between the air and smoke system of a power station boiler using a fan pulverizer and a traditional power station boiler is that the low-temperature flue gas returned by the circulating fan and the high-temperature flue gas in the furnace are introduced into the fan pulverizer together with the hot air passing through the air preheater, serving as a medium to transport and dry the raw coal entering the fan pulverizer.

[0004] Due to the existence of low-temperature flue gas and high-temperature flue gas, the heat balance system of power station boilers using fan pulverizers has also changed. The traditional power station boiler efficiency measurement and calculation methods are no longer applicable. Therefore, there is an urgent need for a power station boiler efficiency measurement scheme suitable for fan pulverizers. Summary of the invention

[0005] In response to the problems in the prior art, the present application provides a method and device for measuring the efficiency of a power plant boiler using a fan coal mill, which can accurately measure the efficiency of a power plant boiler using a fan coal mill to improve the economy of the power plant boiler operation and provide supporting data for the design, manufacture, operation optimization and energy conservation and emission reduction of electric boilers using fan mills.

[0006] In order to solve at least one of the above problems, the present application provides the following technical solutions:

[0007] In a first aspect, the present application provides a method for measuring the efficiency of a power plant boiler using a fan coal mill, comprising:

[0008] The total heat loss of the boiler is determined based on the heat loss of flue gas, heat loss of incomplete combustion of gas, heat loss of incomplete combustion of solid, heat loss of boiler heat dissipation and physical heat loss of ash collected within a set period of the power station boiler using a fan coal mill;

[0009] Determine the input system heat according to the heat of the air entering the air preheater, the heat of the circulating flue gas on the flue after the circulating fan, and the physical sensible heat of the raw coal;

[0010] The boiler efficiency is determined based on the total heat loss of the boiler, the input system heat, and the received low calorific value of the coal.

[0011] Furthermore, the heat of the air entering the air preheater is measured by a first measuring device disposed at the air inlet side of the air preheater using a thermocouple.

[0012] Furthermore, the heat of the circulating flue gas on the rear flue of the circulating fan is measured by a third measuring device arranged on the rear flue of the circulating fan using a thermocouple.

[0013] Furthermore, it also includes:

[0014] The heat of the circulating flue gas on the flue after the circulating fan is obtained according to the circulating flue gas volume flow rate, the circulating flue gas constant pressure specific heat capacity, the mass flow rate of the raw coal, and the difference between the circulating flue gas temperature entering the system boundary and the reference temperature;

[0015] Among them, the volume flow rate of the circulating flue gas is measured by a second measuring device arranged on the flue before the circulating fan using a backrest tube or a Pitot tube, the mass flow rate of the raw coal is measured by a fourth measuring device arranged at the coal feeder weighing device, and the temperature of the circulating flue gas entering the system boundary is measured by a third measuring device arranged on the flue after the circulating fan using a thermocouple.

[0016] Furthermore, the heat loss from exhaust gas is obtained by the following steps, including:

[0017] The heat loss of exhaust gas is obtained based on the volume flow rate of flue gas generated by unit fuel combustion in the exhaust system at standard state, the constant-pressure specific heat capacity of flue gas generated by fuel combustion at the boundary of the exhaust system, the volume flow rate of circulating flue gas, the constant-pressure specific heat capacity of circulating flue gas, the mass flow rate of raw coal, and the difference between the flue gas temperature at the boundary of the exhaust system and the reference temperature.

[0018] Furthermore, the heat loss from incomplete combustion of the gas is obtained by the following steps, including:

[0019] The heat loss of incomplete combustion of gas is obtained according to the volume fraction of CO in the flue gas discharged from the system, the volume flow rate of flue gas generated by unit fuel combustion in the system under standard conditions, the volume flow rate of circulating flue gas entering the system boundary under standard conditions, and the mass flow rate of raw coal;

[0020] The volume fraction of CO in the flue gas of the exhaust system is measured by a fifth measuring device arranged at the air outlet side of the air preheater.

[0021] Furthermore, it also includes:

[0022] The heat of the air entering the air preheater is corrected to the design temperature, and the corresponding corrected flue gas temperature at the exhaust system boundary is obtained.

[0023] Furthermore, it also includes:

[0024] According to the correction amplitude of the flue gas temperature discharged from the system boundary and the circulating flue gas temperature entering the system boundary, the corresponding corrected circulating flue gas temperature entering the system boundary is obtained.

[0025] Furthermore, it also includes:

[0026] According to the corrected flue gas temperature discharged from the system boundary and the circulating flue gas temperature entering the system boundary, the corrected total heat loss of the boiler and the boiler efficiency are determined.

[0027] In a second aspect, the present application provides a power station boiler efficiency measurement device using a fan coal mill, comprising:

[0028] The boiler total heat loss determination module is used to determine the boiler total heat loss based on the exhaust heat loss of the power station boiler using the fan coal mill, the heat loss of the gas incomplete combustion, the heat loss of the solid incomplete combustion, the heat loss of the boiler heat dissipation, and the physical heat loss of the ash collected within a set period.

[0029] The input system heat determination module is used to determine the input system heat according to the heat of the air entering the air preheater, the heat of the circulating flue gas on the flue after the circulating fan, and the physical sensible heat of the raw coal;

[0030] The boiler efficiency determination module is used to determine the boiler efficiency according to the total heat loss of the boiler, the input system heat and the received low calorific value of the coal.

[0031] In a third aspect, the present application provides an electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps of the method for measuring the efficiency of a power plant boiler using a fan coal mill are implemented.

[0032] In a fourth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method for measuring the efficiency of a power plant boiler using a fan coal mill.

[0033] In a fifth aspect, the present application provides a computer program product, including a computer program / instruction, which, when executed by a processor, implements the steps of the method for measuring the efficiency of a power plant boiler using a fan coal mill.

[0034] It can be seen from the above technical scheme that the present application provides a method and device for measuring the efficiency of a power station boiler using a fan coal mill. By accurately calculating the total heat loss of the power station boiler using a fan coal mill and the input system heat, the efficiency of the power station boiler using a fan coal mill can be accurately measured to improve the economy of the operation of the power station boiler, and provide supporting data for the design, manufacture, operation optimization and energy conservation and emission reduction of electric boilers using fan mills. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0036] Figure 1 It is a flow chart of a method for measuring the efficiency of a power station boiler using a fan coal mill in an embodiment of the present application;

[0037] Figure 2 This is a structural diagram of a power station boiler efficiency measurement device using a fan coal mill in an embodiment of the present application;

[0038] Figure 3 It is a schematic diagram of heat balance of a power station boiler using a fan coal mill in the prior art and a schematic diagram of the location of the measuring device in this application;

[0039] Figure 4 It is a schematic diagram of the structure of an electronic device in an embodiment of the present application. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0041] Taking into account the problem that traditional power station boiler efficiency measurement and calculation methods in the prior art are no longer applicable to power station boilers using fan coal mills, the present application provides a power station boiler efficiency measurement method and device using a fan coal mill. By accurately calculating the total boiler heat loss and input system heat of the power station boiler using a fan coal mill, the efficiency of the power station boiler using a fan coal mill can be accurately measured to improve the economy of the power station boiler operation, and provide supporting data for the design, manufacture, operation optimization and energy conservation and emission reduction of electric boilers using fan mills.

[0042] In order to accurately measure the efficiency of a power plant boiler using a fan coal mill, so as to improve the economic efficiency of the power plant boiler operation, and to provide supporting data for the design and manufacture, operation optimization, and energy conservation and emission reduction of electric boilers using fan mills, the present application provides an embodiment of a power plant boiler efficiency measurement method using a fan coal mill, see Figure 1 The power plant boiler efficiency measurement method using a fan coal mill specifically includes the following contents:

[0043] Step S101: Determine the total heat loss of the boiler based on the exhaust heat loss of the power station boiler using a fan coal mill, the heat loss of gas incomplete combustion, the heat loss of solid incomplete combustion, the heat loss of boiler heat dissipation, and the physical heat loss of ash collected within a set period.

[0044] It can be understood that after the heat is utilized in the system, the excess heat is discharged outside the system boundary as loss heat.

[0045] Optional, the total heat loss of the boiler generally includes heat loss from exhaust gas Q2, heat loss from incomplete combustion of gas Q3, heat loss from incomplete combustion of solid Q4, heat loss from boiler heat dissipation Q5, heat loss from ash physical heat Q6 and other heat loss Q oth , see Figure 3 This application is approved by Figure 3 The measuring point 5 in the figure is used to measure the various heat losses of the boiler. The measuring medium is the flue gas discharged from the furnace after passing through the air preheater for heat exchange and the fly ash carried in the flue gas. The measured items include the flue gas composition, flue gas temperature t fg.out and carbon content of fly ash.

[0046] Optionally, the exhaust gas composition is measured by a flue gas analyzer using a grid method to measure the concentration of each flue gas component, including the concentration of O2 and CO. Exhaust gas temperature t fg.out It is measured by thermocouple. The carbon content of fly ash in flue gas is measured by professional testing institutions on the collected fly ash.

[0047] Step S102: Determine the input system heat according to the heat of the air entering the air preheater, the heat of the circulating flue gas on the flue after the circulating fan, and the physical sensible heat of the raw coal.

[0048] It can be understood that the heat entering the system from outside the system boundary is the input system heat.

[0049] See also Figure 3 , optional, power plant boiler input system heat Q using fan mill ex It mainly includes 3 parts: The air heat Q at the measurement point 1 entering the system a, the circulating flue gas heat Q at measurement point 3 fg and the physical sensible heat Q of the coal at the measuring point 4 entering the system f .

[0050] Optionally, the physical sensible heat Q of the coal entering the system f It can be calculated according to the method in GB / T10184-2015 "Power Plant Boiler Performance Test Procedure".

[0051] Step S103: Determine the boiler efficiency according to the total heat loss of the boiler, the input system heat and the received low calorific value of the coal.

[0052] Optionally, the efficiency calculation of the power station boiler using the fan mill in this application can be performed with reference to the method in GB / T10184-2015 "Power Station Boiler Performance Test Procedure", using the counter-balance method, and the calculation formula is as follows:

[0053]

[0054] Where:

[0055] η——boiler efficiency, %;

[0056] Q net,ar ——The received low calorific value of the coal entering the boiler, obtained by testing the raw coal at measuring point 4, kJ / kg;

[0057] Q ex ——heat input to the system boundary, kJ / kg;

[0058] Q loss ——Total boiler loss, kJ / kg.

[0059] From the above description, it can be seen that the method for measuring the efficiency of a power station boiler using a fan coal mill provided in the embodiment of the present application can accurately measure the efficiency of the power station boiler using a fan coal mill by accurately calculating the total boiler heat loss and input system heat of the power station boiler using a fan coal mill, thereby improving the economy of the operation of the power station boiler and providing supporting data for the design, manufacture, operation optimization and energy conservation and emission reduction of electric boilers using fan mills.

[0060] In order to accurately measure the heat of the air entering the air preheater, in one embodiment of the power plant boiler efficiency measurement method using a fan coal mill of the present application, the following contents may also be specifically included:

[0061] The heat of the air entering the air preheater is measured by a first measuring device arranged at the air inlet side of the air preheater using a thermocouple.

[0062] See also Figure 3Optionally, when calculating the input system heat, the heat of the air entering the air preheater is measured by a thermocouple at point 1 located on the air inlet side of the air preheater. The medium measured at point 1 is air, and the measured item is the temperature of the air. a .

[0063] Specifically, the heat of the air entering the system is Q a It can be calculated according to the method in GB / T10184-2015 "Power Plant Boiler Performance Test Procedure".

[0064] In order to accurately measure the heat of circulating flue gas on the flue after the circulating fan, in one embodiment of the power plant boiler efficiency measurement method using a fan coal mill of the present application, the following contents may also be specifically included:

[0065] The heat of the circulating flue gas on the rear flue of the circulating fan is measured by a third measuring device arranged on the rear flue of the circulating fan using a thermocouple.

[0066] See also Figure 3 Optionally, when calculating the input system heat, the heat of the circulating flue gas on the flue behind the circulating fan is measured by a thermocouple at a measuring point 3 arranged on the flue behind the circulating fan. The measuring point 3 is located on the flue behind the circulating fan, and the measured medium is the recycled flue gas.

[0067] Specifically, the item measured at point 3 is the flue gas temperature t fg.r .

[0068] In order to accurately calculate the heat of circulating flue gas on the flue after the circulating fan, in one embodiment of the power plant boiler efficiency measurement method using a fan coal mill of the present application, the following contents may also be specifically included:

[0069] The heat of the circulating flue gas on the flue after the circulating fan is obtained according to the circulating flue gas volume flow rate, the circulating flue gas constant pressure specific heat capacity, the mass flow rate of the raw coal, and the difference between the circulating flue gas temperature entering the system boundary and the reference temperature;

[0070] Among them, the volume flow rate of the circulating flue gas is measured by a second measuring device arranged on the flue before the circulating fan using a backrest tube or a Pitot tube, the mass flow rate of the raw coal is measured by a fourth measuring device arranged at the coal feeder weighing device, and the temperature of the circulating flue gas entering the system boundary is measured by a third measuring device arranged on the flue after the circulating fan using a thermocouple.

[0071] Optionally, the heat of the circulating flue gas entering the system Q fg It can be calculated as follows:

[0072]

[0073] Where:

[0074] Q fg ——The heat of circulating flue gas entering the system, in kJ / kg;

[0075] q v.fg.r ——The volume flow rate of circulating flue gas entering the system boundary under standard conditions, in m 3 / h, measured at measuring point 2 using the boiler efficiency measurement system;

[0076] c p.fg.r ——Specific heat capacity of circulating flue gas at constant pressure entering the system boundary, in kJ / (m 3 gK), the calculation method can be carried out using the method in GB / T10184-2015 "Power Plant Boiler Performance Test Procedure";

[0077] q m.f ——Mass flow rate of raw coal, in kg / h, measured at measuring point 4 using the boiler efficiency measurement system;

[0078] t fg.r ——The circulating flue gas temperature entering the system boundary, in °C, measured at measuring point 3 using the boiler efficiency measurement system;

[0079] t re ——Reference temperature, in °C, in this application, it can be taken as 25 °C as specified in GB / T10184-2015 "Power Plant Boiler Performance Test Procedure".

[0080] In order to accurately calculate the exhaust heat loss, in one embodiment of the power plant boiler efficiency measurement method using a fan coal mill of the present application, the exhaust heat loss is obtained by the following steps, including:

[0081] The heat loss of exhaust gas is obtained based on the volume flow rate of flue gas generated by unit fuel combustion in the exhaust system at standard state, the constant-pressure specific heat capacity of flue gas generated by fuel combustion at the boundary of the exhaust system, the volume flow rate of circulating flue gas, the constant-pressure specific heat capacity of circulating flue gas, the mass flow rate of raw coal, and the difference between the flue gas temperature at the boundary of the exhaust system and the reference temperature.

[0082] Optionally, the main difference between the exhaust heat loss Q2 and the incomplete combustion heat loss Q3 of the power station boiler using a fan mill and a traditional boiler lies in the amount of flue gas discharged from the air preheater. This application assumes that the circulating flue gas entering the boiler heat balance system from the circulating fan outlet does not participate in the combustion chemical reaction in the boiler, that is, the volume and flue gas composition of the circulating flue gas remain unchanged under the standard state when entering and discharging the boundary of the boiler heat balance system. Then, the flue gas volume discharged from the heat balance boundary includes both the flue gas generated by fuel combustion and the circulating flue gas.

[0083] The exhaust heat loss Q2 can be calculated as follows:

[0084]

[0085] Where:

[0086] Q2——The heat carried away by the flue gas from the exhaust system, in kJ / kg;

[0087] V fg.out ——The volume flow rate of flue gas generated by the combustion of unit fuel in the exhaust system under standard conditions, in m 3 / kg, the calculation method can be carried out using the method in GB / T10184-2015 "Power Plant Boiler Performance Test Procedure";

[0088] c p.fg.out ——Specific heat capacity of flue gas at constant pressure generated by fuel combustion at the boundary of the exhaust system, in kJ / (m 3 gK), the calculation method can be carried out using the method in GB / T10184-2015 "Power Plant Boiler Performance Test Procedure";

[0089] t fg.out ——The flue gas temperature at the exhaust system boundary, in °C.

[0090] In order to accurately calculate the heat loss due to incomplete combustion of gas, in one embodiment of the power plant boiler efficiency measurement method using a fan coal mill of the present application, the heat loss due to incomplete combustion of gas is obtained by the following steps, including:

[0091] The heat loss of incomplete combustion of gas is obtained according to the volume fraction of CO in the flue gas discharged from the system, the volume flow rate of flue gas generated by unit fuel combustion in the system under standard conditions, the volume flow rate of circulating flue gas entering the system boundary under standard conditions, and the mass flow rate of raw coal;

[0092] The volume fraction of CO in the flue gas of the exhaust system is measured by a fifth measuring device arranged at the air outlet side of the air preheater.

[0093] Optionally, the heat loss Q3 of incomplete combustion of gas can be calculated as follows:

[0094]

[0095] Where:

[0096] Q3——The heat loss from incomplete combustion in the flue gas discharged from the system, in kJ / kg;

[0097] ——The volume fraction of CO in the flue gas discharged from the system, in %, is measured at measuring point 5 using the boiler efficiency measurement system.

[0098] In order to accurately correct the heat of the air entering the air preheater, in one embodiment of the power plant boiler efficiency measurement method using a fan coal mill of the present application, the following contents may also be specifically included:

[0099] The heat of the air entering the air preheater is corrected to the design temperature, and the corresponding corrected flue gas temperature at the exhaust system boundary is obtained.

[0100] It is understandable that when calculating the efficiency of a power plant boiler, it is also necessary to correct the parameters that deviate from the design value or guaranteed value, such as the air preheater inlet air temperature, to the design conditions, and the corresponding losses in the boiler efficiency calculation must also be converted into results under the design conditions.

[0101] Optional, air preheater inlet air temperature t a Corrected to design temperature t a.d This will cause the exhaust gas temperature and circulating flue gas temperature to change. The corrected exhaust gas temperature t fg.out.cr The calculation method is still in accordance with GB / T10184-2015 "Power Plant Boiler Performance Test Procedure".

[0102] In order to accurately correct the circulating flue gas temperature entering the system boundary, in an embodiment of the power plant boiler efficiency measurement method using a fan coal mill of the present application, the following contents may also be specifically included:

[0103] According to the correction amplitude of the flue gas temperature discharged from the system boundary and the circulating flue gas temperature entering the system boundary, the corresponding corrected circulating flue gas temperature entering the system boundary is obtained.

[0104] Optionally, the circulating flue gas temperature t after the air preheater inlet air temperature is corrected to the design value fg.r.cr It can be calculated as follows:

[0105] t fg.r.cr =t fg.out.cr +(t fg.r -t fg.out )

[0106] In order to accurately correct the boiler efficiency, in one embodiment of the power plant boiler efficiency measurement method using a fan coal mill of the present application, the following contents may also be specifically included:

[0107] According to the corrected flue gas temperature discharged from the system boundary and the circulating flue gas temperature entering the system boundary, the corrected total heat loss of the boiler and the boiler efficiency are determined.

[0108] Optionally, t fg.r Replace with tfg.r.cr , t fg.out Replace with t fg.out.cr , other heat losses remain unchanged, the corrected boiler efficiency can be obtained.

[0109] In order to accurately measure the efficiency of a power plant boiler using a fan coal mill, so as to improve the economic efficiency of the power plant boiler operation, and provide supporting data for the design and manufacture, operation optimization, and energy conservation and emission reduction of electric boilers using fan mills, the present application provides an embodiment of a power plant boiler efficiency measurement device using a fan coal mill for realizing all or part of the contents of the power plant boiler efficiency measurement method using a fan coal mill, see Figure 2 The power station boiler efficiency measuring device using a fan coal mill specifically includes the following contents:

[0110] The boiler total heat loss determination module 10 is used to determine the boiler total heat loss based on the exhaust heat loss of the power station boiler using a fan pulverizer, the heat loss of gas incomplete combustion, the heat loss of solid incomplete combustion, the heat loss of boiler heat dissipation, and the physical heat loss of ash collected within a set period.

[0111] The input system heat determination module 20 is used to determine the input system heat according to the heat of the air entering the air preheater, the heat of the circulating flue gas on the flue after the circulating fan, and the physical sensible heat of the raw coal.

[0112] The boiler efficiency determination module 30 is used to determine the boiler efficiency according to the total heat loss of the boiler, the input system heat and the received low calorific value of the coal.

[0113] From the above description, it can be seen that the power station boiler efficiency measurement device using a fan coal mill provided in the embodiment of the present application can accurately calculate the total boiler heat loss and input system heat of the power station boiler using a fan coal mill, thereby accurately measuring the efficiency of the power station boiler using a fan coal mill, so as to improve the economy of the power station boiler operation and provide supporting data for the design, manufacture, operation optimization and energy conservation and emission reduction of electric boilers using fan mills.

[0114] From the hardware level, in order to accurately measure the efficiency of a power plant boiler using a fan coal mill, so as to improve the economic efficiency of the power plant boiler operation, and provide supporting data for the design and manufacture, operation optimization, and energy conservation and emission reduction of electric boilers using fan mills, the present application provides an embodiment of an electronic device for implementing all or part of the content of the power plant boiler efficiency measurement method using a fan coal mill, and the electronic device specifically includes the following content:

[0115] Processor, memory, communication interface and bus; wherein the processor, memory and communication interface communicate with each other through the bus; the communication interface is used to realize information transmission between the power plant boiler efficiency measurement device using a fan coal mill and related equipment such as a core business system, a user terminal and a related database; the logic controller can be a desktop computer, a tablet computer and a mobile terminal, etc., but the present embodiment is not limited thereto. In the present embodiment, the logic controller can be implemented with reference to the embodiment of the power plant boiler efficiency measurement method using a fan coal mill and the embodiment of the power plant boiler efficiency measurement device using a fan coal mill, and the contents thereof are incorporated herein, and the repeated parts are not repeated.

[0116] It is understandable that the user terminal may include a smart phone, a tablet electronic device, a network set-top box, a portable computer, a desktop computer, a personal digital assistant (PDA), a vehicle-mounted device, a smart wearable device, etc. Among them, the smart wearable device may include smart glasses, a smart watch, a smart bracelet, etc.

[0117] In practical applications, part of the power plant boiler efficiency measurement method using a fan coal mill can be executed on the electronic device side as described above, or all operations can be completed in the client device. The specific selection can be based on the processing capacity of the client device and the limitations of the user's usage scenario. This application does not limit this. If all operations are completed in the client device, the client device may also include a processor.

[0118] The client device may have a communication module (i.e., a communication unit) that can communicate with a remote server to achieve data transmission with the server. The server may include a server on the task scheduling center side, and other implementation scenarios may also include a server on an intermediate platform, such as a server on a third-party server platform that has a communication link with the task scheduling center server. The server may include a single computer device, or a server cluster consisting of multiple servers, or a server structure of a distributed device.

[0119] Figure 4 FIG. 9 is a schematic block diagram of the system structure of the electronic device 9600 according to an embodiment of the present application. Figure 4 As shown, the electronic device 9600 may include a central processor 9100 and a memory 9140; the memory 9140 is coupled to the central processor 9100. It is worth noting that Figure 4 is exemplary; other types of structures may also be used to supplement or replace this structure to implement telecommunication functions or other functions.

[0120] In one embodiment, the function of the power plant boiler efficiency measurement method using a fan coal mill can be integrated into the central processor 9100. The central processor 9100 can be configured to perform the following control:

[0121] Step S101: Determine the total heat loss of the boiler based on the exhaust heat loss of the power station boiler using a fan coal mill, the heat loss of gas incomplete combustion, the heat loss of solid incomplete combustion, the heat loss of boiler heat dissipation, and the physical heat loss of ash collected within a set period.

[0122] Step S102: Determine the input system heat according to the heat of the air entering the air preheater, the heat of the circulating flue gas on the flue after the circulating fan, and the physical sensible heat of the raw coal.

[0123] Step S103: Determine the boiler efficiency according to the total heat loss of the boiler, the input system heat and the received low calorific value of the coal.

[0124] From the above description, it can be seen that the electronic device provided in the embodiment of the present application can accurately measure the efficiency of the power station boiler using a fan coal mill by accurately calculating the total boiler heat loss and input system heat of the power station boiler using a fan coal mill, thereby improving the economy of the power station boiler operation and providing supporting data for the design, manufacture, operation optimization and energy conservation and emission reduction of the electric boiler using a fan mill.

[0125] In another embodiment, the power plant boiler efficiency measurement device using a fan coal mill can be configured separately from the central processor 9100. For example, the power plant boiler efficiency measurement device using a fan coal mill can be configured as a chip connected to the central processor 9100, and the power plant boiler efficiency measurement method using a fan coal mill can be implemented through the control of the central processor.

[0126] like Figure 4 As shown, the electronic device 9600 may also include: a communication module 9110, an input unit 9120, an audio processor 9130, a display 9160, and a power supply 9170. It is worth noting that the electronic device 9600 does not necessarily have to include Figure 4 In addition, the electronic device 9600 may also include Figure 4 For components not shown, reference may be made to the prior art.

[0127] like Figure 4 As shown, the central processing unit 9100 is sometimes also referred to as a controller or an operation control, and may include a microprocessor or other processor device and / or logic device. The central processing unit 9100 receives input and controls the operation of various components of the electronic device 9600.

[0128] The memory 9140 may be, for example, one or more of a cache, a flash memory, a hard drive, a removable medium, a volatile memory, a non-volatile memory or other suitable devices. The above-mentioned information related to the failure may be stored, and a program for executing the relevant information may also be stored. The CPU 9100 may execute the program stored in the memory 9140 to implement information storage or processing, etc.

[0129] The input unit 9120 provides input to the central processing unit 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 to display display objects such as images and texts. The display may be, for example, an LCD display, but is not limited thereto.

[0130] The memory 9140 may be a solid-state memory, such as a read-only memory (ROM), a random access memory (RAM), a SIM card, etc. It may also be a memory that saves information even when the power is off, can be selectively erased, and is provided with more data, examples of which are sometimes referred to as EPROMs, etc. 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 unit 9142, which is used to store application programs and function programs or processes for executing the operation of the electronic device 9600 through the central processor 9100.

[0131] The memory 9140 may also include a data storage unit 9143 for storing data, such as contacts, digital data, pictures, sounds, and / or any other data used by the electronic device. The driver storage unit 9144 of the memory 9140 may include various drivers for communication functions of the electronic device and / or for executing other functions of the electronic device (such as messaging applications, address book applications, etc.).

[0132] The communication module 9110 is a transmitter / receiver 9110 that sends 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 the case of a conventional mobile communication terminal.

[0133] Based on different communication technologies, multiple communication modules 9110 may be provided in the same electronic device, such as a cellular network module, a Bluetooth module and / or a wireless LAN module, etc. The communication module (transmitter / receiver) 9110 is also coupled to a speaker 9131 and a microphone 9132 via an audio processor 9130 to provide an audio output via the speaker 9131 and receive an audio input from the microphone 9132, thereby realizing a common telecommunication function. The audio processor 9130 may include any suitable buffer, decoder, amplifier, etc. In addition, the audio processor 9130 is also coupled to the central processor 9100, so that recording can be performed on the local machine through the microphone 9132, and the sound stored on the local machine can be played through the speaker 9131.

[0134] The embodiments of the present application also provide a computer-readable storage medium capable of implementing all steps of the method for measuring the efficiency of a power plant boiler using a fan coal mill in the above embodiment, where the execution subject is a server or a client. The computer-readable storage medium stores a computer program. When the computer program is executed by a processor, all steps of the method for measuring the efficiency of a power plant boiler using a fan coal mill in the above embodiment are implemented. For example, when the processor executes the computer program, the following steps are implemented:

[0135] Step S101: Determine the total heat loss of the boiler based on the exhaust heat loss of the power station boiler using a fan coal mill, the heat loss of gas incomplete combustion, the heat loss of solid incomplete combustion, the heat loss of boiler heat dissipation, and the physical heat loss of ash collected within a set period.

[0136] Step S102: Determine the input system heat according to the heat of the air entering the air preheater, the heat of the circulating flue gas on the flue after the circulating fan, and the physical sensible heat of the raw coal.

[0137] Step S103: Determine the boiler efficiency according to the total heat loss of the boiler, the input system heat and the received low calorific value of the coal.

[0138] From the above description, it can be seen that the computer-readable storage medium provided in the embodiment of the present application can accurately measure the efficiency of the power station boiler using a fan coal mill by accurately calculating the total boiler heat loss and input system heat of the power station boiler using a fan coal mill, so as to improve the economy of the power station boiler operation and provide supporting data for the design, manufacture, operation optimization and energy conservation and emission reduction of electric boilers using fan mills.

[0139] The embodiments of the present application also provide a computer program product capable of implementing all steps of the method for measuring the efficiency of a power plant boiler using a fan coal mill in the above-mentioned embodiment, the execution subject of which is a server or a client. When the computer program / instruction is executed by a processor, the steps of the method for measuring the efficiency of a power plant boiler using a fan coal mill are implemented. For example, the computer program / instruction implements the following steps:

[0140] Step S101: Determine the total heat loss of the boiler based on the exhaust heat loss of the power station boiler using a fan coal mill, the heat loss of gas incomplete combustion, the heat loss of solid incomplete combustion, the heat loss of boiler heat dissipation, and the physical heat loss of ash collected within a set period.

[0141] Step S102: Determine the input system heat according to the heat of the air entering the air preheater, the heat of the circulating flue gas on the flue after the circulating fan, and the physical sensible heat of the raw coal.

[0142] Step S103: Determine the boiler efficiency according to the total heat loss of the boiler, the input system heat and the received low calorific value of the coal.

[0143] From the above description, it can be seen that the computer program product provided in the embodiment of the present application can accurately measure the efficiency of the power station boiler using a fan coal mill by accurately calculating the total boiler heat loss and input system heat of the power station boiler using a fan coal mill, so as to improve the economy of the power station boiler operation and provide supporting data for the design, manufacture, operation optimization and energy conservation and emission reduction of electric boilers using fan mills.

[0144] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, devices, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0145] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (apparatus), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0146] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0147] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0148] The present invention uses specific embodiments to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A method for measuring the efficiency of a power plant boiler using a fan coal mill, characterized in that: The method comprises: The total heat loss of the boiler is determined based on the heat loss of flue gas, heat loss of incomplete combustion of gas, heat loss of incomplete combustion of solid, heat loss of boiler heat dissipation and physical heat loss of ash collected within a set period of the power station boiler using a fan coal mill; Determine the input system heat according to the heat of the air entering the air preheater, the heat of the circulating flue gas on the flue after the circulating fan, and the physical sensible heat of the raw coal; Determining boiler efficiency based on the total heat loss of the boiler, the input system heat, and the received low calorific value of coal; The heat of the air entering the air preheater is measured by a first measuring device disposed at the air inlet side of the air preheater using a thermocouple; The heat of the circulating flue gas on the rear flue of the circulating fan is measured by a third measuring device arranged on the rear flue of the circulating fan using a thermocouple; The method further comprises: The heat of the circulating flue gas on the flue after the circulating fan is obtained according to the circulating flue gas volume flow rate, the circulating flue gas constant pressure specific heat capacity, the mass flow rate of the raw coal, and the difference between the circulating flue gas temperature entering the system boundary and the reference temperature; The circulating flue gas volume flow rate is measured by a second measuring device arranged on the flue before the circulating fan using a backrest tube or a pitot tube, the raw coal mass flow rate is measured by a fourth measuring device arranged at the coal feeder weighing device, and the circulating flue gas temperature entering the system boundary is measured by a third measuring device arranged on the flue after the circulating fan using a thermocouple; The heat loss from exhaust gas is obtained by the following steps, including: The heat loss of exhaust heat is obtained according to the volume flow rate of flue gas generated by unit fuel combustion in the exhaust system at the standard state, the constant pressure specific heat capacity of flue gas generated by fuel combustion at the boundary of the exhaust system, the volume flow rate of circulating flue gas, the constant pressure specific heat capacity of circulating flue gas, the mass flow rate of raw coal, and the difference between the flue gas temperature at the boundary of the exhaust system and the reference temperature; The exhaust heat loss heat can be calculated according to the following formula: Among them, Q2 represents the heat loss of exhaust gas; V fg.out Indicates the volume flow rate of flue gas produced by unit fuel combustion in the exhaust system under standard conditions; c p.fg.out Indicates the constant pressure specific heat capacity of flue gas generated by fuel combustion at the boundary of the exhaust system; t fg.out Indicates the flue gas temperature at the boundary of the exhaust system; t re Indicates the reference temperature; q v.fg.r represents the circulating flue gas volume flow rate entering the system boundary under standard conditions; c p. f g.r represents the constant pressure specific heat capacity of circulating flue gas entering the system boundary; q m. f represents the mass flow rate of raw coal.

2. The method for measuring the efficiency of a power plant boiler using a fan coal mill according to claim 1, characterized in that: The heat loss from incomplete combustion of the gas is obtained by the following steps, including: The heat loss of incomplete combustion of gas is obtained according to the volume fraction of CO in the flue gas discharged from the system, the volume flow rate of flue gas generated by unit fuel combustion in the system under standard conditions, the volume flow rate of circulating flue gas entering the system boundary under standard conditions, and the mass flow rate of raw coal; The volume fraction of CO in the flue gas of the exhaust system is measured by a fifth measuring device arranged at the air outlet side of the air preheater.

3. The method for measuring the efficiency of a power plant boiler using a fan coal mill according to claim 1, characterized in that: Also includes: The heat of the air entering the air preheater is corrected to the design temperature, and the corresponding corrected flue gas temperature at the exhaust system boundary is obtained.

4. The method for measuring the efficiency of a power plant boiler using a fan coal mill according to claim 3, characterized in that: Also includes: According to the correction amplitude of the flue gas temperature discharged from the system boundary and the circulating flue gas temperature entering the system boundary, the corresponding corrected circulating flue gas temperature entering the system boundary is obtained.

5. The method for measuring the efficiency of a power plant boiler using a fan coal mill according to claim 4, characterized in that: Also includes: According to the corrected flue gas temperature discharged from the system boundary and the circulating flue gas temperature entering the system boundary, the corrected total heat loss of the boiler and the boiler efficiency are determined.

6. A power station boiler efficiency measuring device using a fan coal mill, characterized in that: include: The boiler total heat loss determination module is used to determine the boiler total heat loss based on the exhaust heat loss of the power station boiler using the fan coal mill, the heat loss of the gas incomplete combustion, the heat loss of the solid incomplete combustion, the heat loss of the boiler heat dissipation, and the physical heat loss of the ash collected within a set period. The input system heat determination module is used to determine the input system heat according to the heat of the air entering the air preheater, the heat of the circulating flue gas on the flue after the circulating fan, and the physical sensible heat of the raw coal; The boiler efficiency determination module is used to determine the boiler efficiency according to the total heat loss of the boiler, the input system heat and the received low calorific value of the coal; wherein, The heat of the air entering the air preheater is measured by a first measuring device disposed at the air inlet side of the air preheater using a thermocouple; The heat of the circulating flue gas on the rear flue of the circulating fan is measured by a third measuring device arranged on the rear flue of the circulating fan using a thermocouple; wherein the heat of the circulating flue gas on the rear flue of the circulating fan is obtained according to the circulating flue gas volume flow rate, the circulating flue gas constant pressure specific heat capacity, the mass flow rate of the raw coal, the difference between the circulating flue gas temperature entering the system boundary and the reference temperature; the circulating flue gas volume flow rate is obtained by a second measuring device arranged on the front flue of the circulating fan using a backrest tube or a pitot tube, the mass flow rate of the raw coal is measured by a fourth measuring device arranged at the coal feeder weighing device, and the circulating flue gas temperature entering the system boundary is measured by a third measuring device arranged on the rear flue of the circulating fan using a thermocouple; The heat loss from exhaust gas is obtained by the following steps, including: The heat loss of exhaust heat is obtained according to the volume flow rate of flue gas generated by unit fuel combustion in the exhaust system at the standard state, the constant pressure specific heat capacity of flue gas generated by fuel combustion at the boundary of the exhaust system, the volume flow rate of circulating flue gas, the constant pressure specific heat capacity of circulating flue gas, the mass flow rate of raw coal, and the difference between the flue gas temperature at the boundary of the exhaust system and the reference temperature; The exhaust heat loss heat can be calculated according to the following formula: Among them, Q2 represents the heat loss of exhaust gas; V fg.out Indicates the volume flow rate of flue gas produced by unit fuel combustion in the exhaust system under standard conditions; c p.fg.out Indicates the constant pressure specific heat capacity of flue gas generated by fuel combustion at the boundary of the exhaust system; t fg.out Indicates the flue gas temperature at the boundary of the exhaust system; t re Indicates the reference temperature; q v.fg.r represents the circulating flue gas volume flow rate entering the system boundary under standard conditions; c p.fg.r represents the constant pressure specific heat capacity of circulating flue gas entering the system boundary; q m.f Indicates the mass flow rate of raw coal.

7. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the steps of the method for measuring the efficiency of a power plant boiler using a fan coal mill as described in any one of claims 1 to 5 are implemented.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method for measuring the efficiency of a power plant boiler using a fan coal mill as described in any one of claims 1 to 5 are implemented.

9. A computer program product comprising a computer program / instructions, characterized in that When the computer program / instruction is executed by a processor, the steps of the method for measuring the efficiency of a power plant boiler using a fan coal mill as described in any one of claims 1 to 5 are implemented.

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