A flue gas temperature correction method and device based on heat capacity ratio

Abstract

This application proposes a method and apparatus for correcting flue gas temperature based on heat capacity ratio, comprising: acquiring the air leakage rate, average specific heat of the air side, average specific heat of the flue gas side, actual temperature data, and design temperature data of the air preheater; designing a first coefficient based on the air leakage rate, average specific heat of the air side, and average specific heat of the flue gas side; calculating the actual heat capacity ratio based on the actual temperature data; obtaining the design heat capacity ratio based on the design temperature data; calculating the actual air preheater efficiency based on the first coefficient and the actual temperature data; obtaining a first equation and a second equation for correcting the air preheater efficiency based on the assumption that the number of heat transfer units remains unchanged before and after correction, and based on the assumption that the heat capacity ratio after correction is the same as the design heat capacity ratio; and obtaining the corrected flue gas temperature based on the first equation and the second equation. This application compares the corrected flue gas temperature with the design value to reasonably, scientifically, and quantitatively evaluate the true level and effect of the boiler flue gas temperature.

Description

Technical Field

[0001] This application relates to the field of flue gas temperature evaluation for power plant boilers, and in particular to a method and apparatus for correcting flue gas temperature based on heat capacity ratio. Background Technology

[0002] Flue gas temperature is a crucial performance indicator for power plant boilers. Whether the flue gas temperature reaches the design value under various load conditions is an important criterion for evaluating boiler performance. Since actual operating conditions differ from design conditions, it is necessary to correct the flue gas temperature to accurately assess the actual operating level of the boiler.

[0003] The GB / T10184 Standard for Performance Testing of Power Plant Boilers includes corrections for both inlet air temperature and feedwater temperature in its flue gas temperature correction algorithm. Both inlet and feedwater temperatures must be corrected to their design values ​​before the boiler performance can be evaluated based on the difference between the corrected flue gas temperature and the design flue gas temperature. Besides inlet and feedwater temperatures, parameters such as flue gas airflow rate and flue gas-to-air ratio also significantly affect flue gas temperature. Furthermore, in actual operating conditions, these parameters often deviate considerably from their design values. However, this standard lacks a correction for flue gas airflow rate or flue gas-to-air ratio to address these parameters, making it impossible to evaluate flue gas temperature under actual operating conditions. Summary of the Invention

[0004] To address the aforementioned issues, a method and device for correcting flue gas temperature based on heat capacity ratio is proposed. This method directly compares the corrected flue gas temperature with the design value, providing a reasonable, scientific, and quantitative evaluation of the actual level and effect of boiler flue gas temperature.

[0005] The first aspect of this application proposes a method for correcting flue gas temperature based on heat capacity ratio, including:

[0006] The air leakage rate, average specific heat on the air side, average specific heat on the flue gas side, actual temperature data, and design temperature data of the air preheater are obtained. The actual temperature data includes the inlet flue gas temperature, exhaust gas temperature, inlet air temperature, and outlet air temperature. The design temperature data includes the design inlet flue gas temperature, design exhaust gas temperature, design inlet air temperature, and design outlet air temperature.

[0007] The first coefficient is designed based on the air leakage rate, the average specific heat of the air side, and the average specific heat of the flue gas side. The actual heat capacity ratio is calculated based on the actual temperature data. The design heat capacity ratio is obtained based on the design temperature data. The actual air preheater efficiency is calculated based on the first coefficient and the actual temperature data.

[0008] Based on the fact that the number of heat transfer units remains unchanged before and after the correction, and based on the fact that the heat capacity ratio after the correction is the same as the design heat capacity ratio, the first equation and the second equation for the efficiency of the corrected air preheater are obtained.

[0009] Based on the first equation and the second equation, the corrected flue gas temperature is obtained.

[0010] Optionally, the step of designing a first coefficient based on the air leakage rate, the average specific heat on the air side, and the average specific heat on the flue gas side includes:

[0011]

[0012] Where K is the first coefficient, AL is the air leakage rate, and c PA c is the average specific heat on the air side. PG The average specific heat on the flue gas side;

[0013] The step of calculating the actual heat capacity ratio based on the actual temperature data includes:

[0014]

[0015] Among them, R T The actual heat capacity ratio, m A c pA For air-side heat capacity, m G c pG For the heat capacity on the flue gas side, t G1 Let t be the temperature of the inlet flue gas. G2 Let t be the exhaust gas temperature. A2 t represents the outlet air temperature. A1 The temperature of the inlet air;

[0016] The step of obtaining the design heat capacity ratio based on the design temperature data includes:

[0017]

[0018] Among them, R D For the design heat capacity ratio, t G1D For the designed inlet flue gas temperature, t G2D For the designed exhaust gas temperature, t A2D t represents the designed outlet air temperature. A1D The design is for the inlet air temperature.

[0019] Optionally, the step of calculating the actual air preheater efficiency based on the first coefficient and the actual temperature data includes:

[0020]

[0021] Where, η T The actual air preheater efficiency is given.

[0022] Optionally, the first and second equations for obtaining the corrected air preheater efficiency are derived by combining the actual heat capacity ratio and the design heat capacity ratio, based on the assumption that the number of heat transfer units remains unchanged before and after the correction and that the design heat capacity ratio remains the same before and after the correction. These equations include:

[0023] Based on the fact that the number of heat transfer units remains unchanged before and after the correction, the first equation for the efficiency of the modified air preheater is obtained.

[0024] Based on the fact that the corrected heat capacity ratio is the same as the design heat capacity ratio, and according to the steps for obtaining the actual air preheater efficiency, a second equation is used to calculate the air preheater efficiency.

[0025] Optionally, the first equation for obtaining the corrected air preheater efficiency based on the unchanged number of heat transfer units before and after the correction includes:

[0026] In an air preheater, the air preheater efficiency, heat capacity ratio, and heat transfer effectiveness have the following relationships:

[0027]

[0028] Wherein, η is the efficiency of the air preheater, R is the heat capacity ratio, and ε is the heat transfer efficiency;

[0029] In the countercurrent heat transfer model, the heat capacity ratio, the heat transfer efficiency, and the number of heat transfer units have the following relationship:

[0030]

[0031] Where NTU represents the number of heat transfer units;

[0032] Since the air preheater is a counter-current heat transfer model that uses flue gas to heat air, combining (1) and (2) yields:

[0033]

[0034] Rearranging NTU terms yields:

[0035]

[0036] Since the number of heat transfer units remains unchanged before and after the correction, substituting the actual parameters and the corrected parameters into (3) yields:

[0037]

[0038] Where, η cr For the corrected air preheater efficiency;

[0039] Based on the actual air preheater efficiency, the actual heat capacity ratio, and the design heat capacity ratio, a second coefficient is designed, which is then formulated as follows:

[0040]

[0041] Where S is the second coefficient;

[0042] Transforming (4) and substituting the second coefficient into (4), we obtain the first equation for the modified air preheater efficiency, which is formulated as follows:

[0043]

[0044] Optionally, the step of calculating the second equation for the corrected air preheater efficiency based on the fact that the corrected heat capacity ratio and the design heat capacity ratio are the same, and according to the step of obtaining the actual air preheater efficiency, includes:

[0045]

[0046] Among them, t G2cr The corrected exhaust temperature is given.

[0047] Optionally, obtaining the corrected flue gas temperature based on the first equation and the second equation includes:

[0048]

[0049] Transform (5) to obtain the calculation formula for the corrected flue gas temperature:

[0050]

[0051] The second aspect of this application proposes a flue gas temperature correction device based on heat capacity ratio, comprising:

[0052] The acquisition module is used to acquire the air leakage rate, average specific heat of the air side, average specific heat of the flue gas side, actual temperature data and design temperature data of the air preheater. The actual temperature data includes the inlet flue gas temperature, exhaust gas temperature, inlet air temperature and outlet air temperature. The design temperature data includes the design inlet flue gas temperature, design exhaust gas temperature, design inlet air temperature and design outlet air temperature.

[0053] The first calculation module is used to design a first coefficient based on the air leakage rate, the average specific heat of the air side, and the average specific heat of the flue gas side; calculate the actual heat capacity ratio based on the actual temperature data; obtain the design heat capacity ratio based on the design temperature data; and calculate the actual air preheater efficiency based on the first coefficient and the actual temperature data.

[0054] The second calculation module is used to obtain the first and second equations for the efficiency of the air preheater based on the fact that the number of heat transfer units before and after the correction remains unchanged and that the heat capacity ratio after the correction is the same as the design heat capacity ratio.

[0055] The third calculation module obtains the corrected flue gas temperature based on the first equation and the second equation.

[0056] A third aspect of this application provides a computer device including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, it implements any of the methods described in the first aspect above.

[0057] The fourth aspect of this application provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method described in any of the first aspects above.

[0058] The technical solutions provided by the embodiments of this application have at least the following beneficial effects:

[0059] By using the heat capacity ratio to correct the flue gas temperature and eliminating the influence of various factors on the flue gas temperature, the actual level of the flue gas temperature is compared with the design value, so as to reasonably, scientifically and quantitatively evaluate whether it has reached the design value.

[0060] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0061] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0062] Figure 1 This is a flowchart illustrating a method for correcting flue gas temperature based on heat capacity ratio, according to an embodiment of this application.

[0063] Figure 2 This is a block diagram illustrating a flue gas temperature correction device based on heat capacity ratio according to an embodiment of this application;

[0064] Figure 3 It is a block diagram of an electronic device. Detailed Implementation

[0065] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0066] In actual boiler operation, lower flue gas temperature generally indicates higher boiler efficiency and better operating performance. However, when parameters such as flue gas flow rate, air flow rate, flue gas specific heat, and air specific heat deviate from design values, directly comparing the actual flue gas temperature with the design value cannot reasonably evaluate the actual operating level and performance of the boiler.

[0067] Flue gas flow rate, air flow rate, flue gas specific heat, and air specific heat all affect the heat exchange process of the air preheater, thus directly impacting the exhaust gas temperature. The heat capacity ratio, the ratio of the air-side heat capacity to the flue gas-side heat capacity of the air preheater, is a dimensionless quantity characterizing the above four parameters and also represents the flue gas-air ratio. Therefore, the heat capacity ratio can be used to correct the exhaust gas temperature, eliminating the influence of various factors. Then, it can be compared with the design value to reasonably, scientifically, and quantitatively evaluate the true level of the exhaust gas temperature and determine whether it meets the design value.

[0068] Figure 1 This is a flowchart illustrating a flue gas temperature correction method based on heat capacity ratio according to an embodiment of this application, including:

[0069] Step 101: Obtain the air leakage rate, average specific heat on the air side, average specific heat on the flue gas side, actual temperature data, and design temperature data of the air preheater. The actual temperature data includes the inlet flue gas temperature, exhaust gas temperature, inlet air temperature, and outlet air temperature. The design temperature data includes the design inlet flue gas temperature, design exhaust gas temperature, design inlet air temperature, and design outlet air temperature.

[0070] In this embodiment of the application, it should be noted that the temperature parameters are obtained by direct measurement using a thermometer or electronic meter, and the air leakage rate, average specific heat on the air side, and average specific heat on the flue gas side are also calculated using conventional techniques.

[0071] It should be noted that the temperature parameters in this application embodiment are in degrees Celsius.

[0072] Step 102: Design the first coefficient based on the air leakage rate, the average specific heat of the air side, and the average specific heat of the flue gas side; calculate the actual heat capacity ratio based on the actual temperature data; obtain the design heat capacity ratio based on the design temperature data; and calculate the actual air preheater efficiency based on the first coefficient and the actual temperature data.

[0073] In this embodiment of the application, the first coefficient is obtained by designing the following formula, including:

[0074]

[0075] Where K is the first coefficient, AL is the air leakage rate, and c PA c is the average specific heat on the air side. PG This represents the average specific heat on the flue gas side.

[0076] In this embodiment, the heat capacity ratio is the ratio of the air-side heat capacity to the flue gas-side heat capacity of the air preheater, where heat capacity is the product of flow rate and specific heat. Simultaneously, according to the heat balance equation, the heat capacity ratio is also the ratio of the flue gas-side temperature drop to the air-side temperature rise. Therefore, the actual heat capacity ratio is calculated using the following formulas:

[0077]

[0078] Among them, R T For the actual heat capacity ratio, m A c pA For air-side heat capacity, m G c pG For the heat capacity on the flue gas side, t G1 t represents the temperature of the inlet flue gas. G2 t represents the exhaust gas temperature. A2 t represents the outlet air temperature. A1 The temperature of the incoming air;

[0079] The design heat capacity ratio is calculated using the following formulas, including:

[0080]

[0081] Among them, R D To design the heat capacity ratio, t G1D To design the inlet flue gas temperature, t G2D To design the flue gas temperature, t A2D To design the outlet air temperature, t A1D To design the inlet air temperature.

[0082] It should be noted that the units for air-side heat capacity and flue gas-side heat capacity are W / K.

[0083] In this embodiment of the application, the actual air preheater efficiency is obtained through the following formula, including:

[0084]

[0085] Where, η T This represents the actual air preheater efficiency.

[0086] Step 103: Based on the fact that the number of heat transfer units remains unchanged before and after the correction and that the heat capacity ratio after the correction is the same as the design heat capacity ratio, the first equation and the second equation for the corrected air preheater efficiency are obtained.

[0087] It should be noted that, based on the premise that the number of heat transfer units remains unchanged before and after the correction, the first equation for the efficiency of the corrected air preheater is obtained.

[0088] Specifically, the air preheater efficiency, heat capacity ratio, and heat transfer effectiveness have the following relationships:

[0089]

[0090] Where η is the air preheater efficiency, R is the heat capacity ratio, and ε is the heat transfer efficiency;

[0091] In the countercurrent heat transfer model, the heat capacity ratio, heat transfer efficiency, and number of heat transfer units have the following relationships:

[0092]

[0093] Where NTU represents the number of heat transfer units;

[0094] Since the air preheater is a counter-current heat transfer model that uses flue gas to heat air, the relationship between the heat capacity ratio, heat transfer efficiency, and number of heat transfer units in the counter-current heat transfer model can be extended to the air preheater model. By combining the air preheater model (1) and the counter-current heat transfer model (2), we can obtain:

[0095]

[0096] Rearranging NTU terms yields:

[0097]

[0098] Since the number of heat transfer units remains unchanged before and after the correction, substituting the actual parameters and the corrected parameters into (3) yields:

[0099]

[0100] Where, η cr To correct the efficiency of the air preheater;

[0101] Based on the actual air preheater efficiency, the actual heat capacity ratio, and the design heat capacity ratio, the second design coefficient is formulated as follows:

[0102]

[0103] Where S is the second coefficient;

[0104] Transforming (4) and substituting the second coefficient into (4), we obtain the first equation for correcting the air preheater efficiency, which is formulated as follows:

[0105]

[0106] Since the heat capacity ratio is the ratio of the air-side heat capacity to the flue gas-side heat capacity of the air preheater, and is a dimensionless quantity characterizing four parameters: inlet flue gas temperature, exhaust gas temperature, inlet air temperature, and outlet air temperature, the second equation for the corrected air preheater efficiency is calculated based on the fact that the corrected heat capacity ratio is the same as the design heat capacity ratio, and according to the steps for obtaining the actual air preheater efficiency.

[0107] Specifically, by correcting the exhaust gas temperature and the air preheater efficiency, the following can be obtained:

[0108]

[0109] Among them, t G2cr To correct the exhaust temperature.

[0110] Step 104: Based on the first equation and the second equation, the corrected flue gas temperature is obtained.

[0111] In this embodiment of the application, the first equation and the second equation are combined to obtain:

[0112]

[0113] Transform (5) to obtain the formula for calculating the corrected flue gas temperature:

[0114]

[0115] Therefore, after eliminating the influence of various factors on the flue gas temperature, the corrected flue gas temperature is compared with the design value to reasonably, scientifically, and quantitatively evaluate the true level of the flue gas temperature and whether it has reached the design value.

[0116] This application's embodiments utilize the heat capacity ratio to correct the flue gas temperature. After eliminating the influence of various factors on the flue gas temperature, it compares it with the design value, thereby reasonably, scientifically, and quantitatively evaluating the true level of the flue gas temperature and assessing whether it has reached the design value.

[0117] Figure 2 This is a block diagram of a flue gas temperature correction device based on heat capacity ratio according to an embodiment of this application, including an acquisition module 210, a first calculation module 220, a second calculation module 230 and a third calculation module 240.

[0118] The acquisition module 210 is used to acquire the air leakage rate, average specific heat of the air side, average specific heat of the flue gas side, actual temperature data and design temperature data of the air preheater. The actual temperature data includes the inlet flue gas temperature, exhaust gas temperature, inlet air temperature and outlet air temperature. The design temperature data includes the design inlet flue gas temperature, design exhaust gas temperature, design inlet air temperature and design outlet air temperature.

[0119] The first calculation module 220 is used to design a first coefficient based on the air leakage rate, the average specific heat of the air side and the average specific heat of the flue gas side, calculate the actual heat capacity ratio based on the actual temperature data, obtain the design heat capacity ratio based on the design temperature data, and calculate the actual air preheater efficiency based on the first coefficient and the actual temperature data.

[0120] The second calculation module 230 is used to obtain the first equation and the second equation for the efficiency of the corrected air preheater based on the fact that the number of heat transfer units before and after the correction remains unchanged and the fact that the heat capacity ratio after the correction and the design heat capacity ratio are the same.

[0121] The third calculation module 240 obtains the corrected flue gas temperature based on the first and second equations.

[0122] Regarding the apparatus in the above embodiments, the specific manner in which each module performs its operation has been described in detail in the embodiments related to the method, and will not be elaborated upon here.

[0123] Figure 3 A schematic block diagram of an example electronic device 300 that can be used to implement embodiments of the present disclosure is shown. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device may also represent various forms of mobile devices, such as personal digital processors, cellular phones, smartphones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely illustrative and are not intended to limit the implementation of the present disclosure described and / or claimed herein.

[0124] like Figure 3 As shown, device 300 includes a computing unit 301, which can perform various appropriate actions and processes based on a computer program stored in read-only memory (ROM) 302 or a computer program loaded from storage unit 303 into random access memory (RAM) 303. The RAM 303 may also store various programs and data required for the operation of device 300. The computing unit 301, ROM 302, and RAM 303 are interconnected via bus 304. Input / output (I / O) interface 305 is also connected to bus 304.

[0125] Multiple components in device 300 are connected to I / O interface 305, including: input unit 306, such as keyboard, mouse, etc.; output unit 307, such as various types of monitors, speakers, etc.; storage unit 308, such as disk, optical disk, etc.; and communication unit 309, such as network card, modem, wireless transceiver, etc. Communication unit 309 allows device 300 to exchange information / data with other devices through computer networks such as the Internet and / or various telecommunications networks.

[0126] The computing unit 301 can be a variety of general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of the computing unit 301 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special-purpose artificial intelligence (AI) computing chips, various computing units running machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. The computing unit 301 performs the various methods and processes described above, such as the voice command response method. For example, in some embodiments, the voice command response method may be implemented as a computer software program tangibly contained in a machine-readable medium, such as storage unit 308. In some embodiments, part or all of the computer program may be loaded and / or installed on device 300 via ROM 302 and / or communication unit 309. When the computer program is loaded into RAM 303 and executed by the computing unit 301, one or more steps of the voice command response method described above may be performed. Alternatively, in other embodiments, the computing unit 301 may be configured to perform the voice command response method by any other suitable means (e.g., by means of firmware).

[0127] Various embodiments of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), application-specific standard products (ASSPs), systems-on-a-chip (SoCs), payload-programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments may include implementations in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which may be a dedicated or general-purpose programmable processor, capable of receiving data and instructions from a storage system, at least one input device, and at least one output device, and transmitting data and instructions to the storage system, the at least one input device, and the at least one output device.

[0128] The program code used to implement the methods of this disclosure may be written in any combination of one or more programming languages. This program code may be provided to a processor or controller of a general-purpose computer, special-purpose computer, or other programmable data processing apparatus, such that when executed by the processor or controller, the program code causes the functions / operations specified in the flowcharts and / or block diagrams to be implemented. The program code may be executed entirely on a machine, partially on a machine, as a standalone software package partially on a machine and partially on a remote machine, or entirely on a remote machine or server.

[0129] In the context of this disclosure, a machine-readable medium can be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, apparatus, or device. A machine-readable medium can be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium can be, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination of the foregoing. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0130] To provide interaction with a user, the systems and techniques described herein can be implemented on a computer having: a display device for displaying information to the user (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor); and a keyboard and pointing device (e.g., a mouse or trackball) through which the user provides input to the computer. Other types of devices can also be used to provide interaction with the user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including sound input, voice input, or tactile input).

[0131] The systems and technologies described herein can be implemented in computing systems that include backend components (e.g., as data servers), or middleware components (e.g., application servers), or frontend components (e.g., user computers with graphical user interfaces or web browsers through which users can interact with implementations of the systems and technologies described herein), or any combination of such backend, middleware, or frontend components. The components of the system can be interconnected via digital data communication of any form or medium (e.g., communication networks). Examples of communication networks include local area networks (LANs), wide area networks (WANs), the Internet, and blockchain networks.

[0132] Computer systems can include clients and servers. Clients and servers are generally geographically separated and typically interact via communication networks. The client-server relationship is created by computer programs running on the respective computers and having a client-server relationship with each other. A server can be a cloud server, also known as a cloud computing server or cloud host, a hosting product within the cloud computing service ecosystem, addressing the shortcomings of traditional physical hosts and VPS (Virtual Private Server, or simply "VPS") services, such as high management difficulty and weak business scalability. Servers can also be servers for distributed systems or servers incorporating blockchain technology.

[0133] It should be understood that the various forms of processes shown above can be used to rearrange, add, or delete steps. For example, the steps described in this disclosure can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution disclosed in this disclosure can be achieved, and this is not limited herein.

[0134] The specific embodiments described above do not constitute a limitation on the scope of protection of this disclosure. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A method for correcting flue gas temperature based on heat capacity ratio, characterized in that, include: The air leakage rate, average specific heat on the air side, average specific heat on the flue gas side, actual temperature data, and design temperature data of the air preheater are obtained. The actual temperature data includes the inlet flue gas temperature, exhaust gas temperature, inlet air temperature, and outlet air temperature. The design temperature data includes the design inlet flue gas temperature, design exhaust gas temperature, design inlet air temperature, and design outlet air temperature. The first coefficient is designed based on the air leakage rate, the average specific heat of the air side, and the average specific heat of the flue gas side. The actual heat capacity ratio is calculated based on the actual temperature data. The design heat capacity ratio is obtained based on the design temperature data. The actual air preheater efficiency is calculated based on the first coefficient and the actual temperature data. Based on the premise that the number of heat transfer units remains unchanged before and after the correction, and that the corrected heat capacity ratio and the design heat capacity ratio are the same, the first and second equations for the corrected air preheater efficiency are obtained, including: Based on the premise that the number of heat transfer units remains unchanged before and after the correction, the first equation for the corrected air preheater efficiency is obtained, including: In an air preheater, the air preheater efficiency, heat capacity ratio, and heat transfer effectiveness have the following relationships: （1） in, R is the efficiency of the air preheater, and R is the heat capacity ratio. The heat transfer effectiveness; In the countercurrent heat transfer model, the heat capacity ratio, the heat transfer efficiency, and the number of heat transfer units have the following relationship: （2） Where NTU represents the number of heat transfer units; Since the air preheater is a counter-current heat transfer model that uses flue gas to heat air, combining (1) and (2) yields: Rearranging NTU terms yields: （3） Since the number of heat transfer units remains unchanged before and after the correction, substituting the actual parameters and the corrected parameters into (3) yields: （4） in, To correct the efficiency of the air preheater. The design heat capacity ratio is... The actual heat capacity ratio, The actual air preheater efficiency; Based on the actual air preheater efficiency, the actual heat capacity ratio, and the design heat capacity ratio, a second coefficient is designed, which is then formulated as follows: in, This is the second coefficient; Transform (4) and substitute the second coefficient into (4) to obtain the first equation for the modified air preheater efficiency, which is formulated as follows: ； Based on the fact that the corrected heat capacity ratio is the same as the design heat capacity ratio, and according to the steps for obtaining the actual air preheater efficiency, the second equation for the corrected air preheater efficiency is calculated. Based on the first equation and the second equation, the corrected flue gas temperature is obtained.

2. The method according to claim 1, characterized in that, The design of the first coefficient based on the air leakage rate, the average specific heat on the air side, and the average specific heat on the flue gas side includes: in, For the first coefficient, The air leakage rate is... The average specific heat on the air side. The average specific heat on the flue gas side; The step of calculating the actual heat capacity ratio based on the actual temperature data includes: in, The actual heat capacity ratio, For air-side heat capacity, For the heat capacity of the flue gas side, The inlet flue gas temperature is... The exhaust gas temperature is... The outlet air temperature is... The temperature of the inlet air; The step of obtaining the design heat capacity ratio based on the design temperature data includes: in, The design heat capacity ratio is... The designed inlet flue gas temperature, The designed exhaust temperature, The designed outlet air temperature, The design is for the inlet air temperature.

3. The method according to claim 2, characterized in that, The step of calculating the actual air preheater efficiency based on the first coefficient and the actual temperature data includes: in, The actual air preheater efficiency is given.

4. The method according to claim 1, characterized in that, The second equation for calculating the corrected air preheater efficiency, based on the fact that the corrected heat capacity ratio and the design heat capacity ratio are the same, and according to the step of obtaining the actual air preheater efficiency, includes: in, The corrected exhaust temperature is given.

5. The method according to claim 1 or 4, characterized in that, The process of obtaining the corrected flue gas temperature based on the first equation and the second equation includes: （5） Transform (5) to obtain the calculation formula for the corrected flue gas temperature:

6. A flue gas temperature correction device based on heat capacity ratio, characterized in that, include: The acquisition module is used to acquire the air leakage rate, average specific heat of the air side, average specific heat of the flue gas side, actual temperature data and design temperature data of the air preheater. The actual temperature data includes the inlet flue gas temperature, exhaust gas temperature, inlet air temperature and outlet air temperature. The design temperature data includes the design inlet flue gas temperature, design exhaust gas temperature, design inlet air temperature and design outlet air temperature. The first calculation module is used to design a first coefficient based on the air leakage rate, the average specific heat of the air side, and the average specific heat of the flue gas side; calculate the actual heat capacity ratio based on the actual temperature data; obtain the design heat capacity ratio based on the design temperature data; and calculate the actual air preheater efficiency based on the first coefficient and the actual temperature data. The second calculation module is used to obtain the first and second equations for the corrected air preheater efficiency based on the premise that the number of heat transfer units remains unchanged before and after the correction, and that the corrected heat capacity ratio and the design heat capacity ratio are the same. The equations include: Based on the premise that the number of heat transfer units remains unchanged before and after the correction, the first equation for the corrected air preheater efficiency is obtained, including: In an air preheater, the air preheater efficiency, heat capacity ratio, and heat transfer effectiveness have the following relationships: （1） in, R is the efficiency of the air preheater, and R is the heat capacity ratio. The heat transfer effectiveness; In the countercurrent heat transfer model, the heat capacity ratio, the heat transfer efficiency, and the number of heat transfer units have the following relationship: （2） Where NTU represents the number of heat transfer units; Since the air preheater is a counter-current heat transfer model that uses flue gas to heat air, combining (1) and (2) yields: Rearranging NTU terms yields: （3） Since the number of heat transfer units remains unchanged before and after the correction, substituting the actual parameters and the corrected parameters into (3) yields: （4） in, To correct the efficiency of the air preheater. The design heat capacity ratio is... The actual heat capacity ratio, The actual air preheater efficiency; Based on the actual air preheater efficiency, the actual heat capacity ratio, and the design heat capacity ratio, a second coefficient is designed, which is then formulated as follows: in, This is the second coefficient; Transform (4) and substitute the second coefficient into (4) to obtain the first equation for the modified air preheater efficiency, which is formulated as follows: ； Based on the fact that the corrected heat capacity ratio is the same as the design heat capacity ratio, and according to the steps for obtaining the actual air preheater efficiency, the second equation for the corrected air preheater efficiency is calculated. The third calculation module obtains the corrected flue gas temperature based on the first equation and the second equation.

7. A computer device, characterized in that, It includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, it implements the method as described in any one of claims 1-5.

8. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the method as described in any one of claims 1-5.

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