Air pre-heater healthy operation life prediction method, equipment and medium

Abstract

The invention provides an air pre-heater healthy operation life prediction method, electronic equipment and a storage medium. The method comprises the steps that the relative blocking differential pressure of an air pre-heater is calculated according to the actual differential pressure of the air pre-heater, the smoke amount under the rated load working condition and the actual smoke amount; according to the relative blocking differential pressure of the air pre-heater, a healthy operation life prediction model of the air pre-heater is constructed; and according to the air pre-heater healthy operation life prediction model, carrying out loss reduction early warning on the air pre-heater healthy operation life. The method solves the problems that in the prior art, the blockage degree is judged according to the differential pressure of the air pre-heater, different working conditions cannot be distinguished, and the blockage condition of the air pre-heater is difficult to visually obtain; the technical problems that whether the air pre-heater is healthy or not at a certain moment can be obtained fuzzily in the mode of judging the health degree through the air pre-heater inlet and outlet differential pressure, and the service life of the air pre-heater cannot be accurately predicted are solved. By adopting the method for predicting the healthy operation life of the air pre-heater provided by the invention, the healthy operation life of the air pre-heater can be predicted in real time.

Description

Technical Field

[0001] This invention relates to the field of coal mining, and more particularly to a method for predicting the healthy operating life of an air preheater, an electronic device, and a storage medium. Background Technology

[0002] As a crucial component of the boiler-side system in coal-fired power units, the air preheater primarily utilizes waste heat from flue gas to heat primary and secondary air, thereby increasing air temperature, reducing flue gas temperature, and improving boiler operating efficiency. Located downstream of the denitrification system, the air preheater can become clogged during operation due to factors such as ABS (Ash: fly ash in flue gas, which easily deposits on heated surfaces; Blocking: channel blockage caused by ash accumulation and scaling; Scale: scale formed by the reaction of corrosive components in flue gas or air with metal), low-temperature corrosion, and other reasons. This can reduce unit operating efficiency and load capacity, and in severe cases, seriously threaten unit safety and cause unscheduled shutdowns. Therefore, predicting the healthy lifespan of the air preheater and providing operational adjustment recommendations are of great significance for the safe, stable, and economical operation of the boiler-side system in coal-fired power plants.

[0003] Currently, there are no relevant technical solutions or systems for predicting the healthy operating life of air preheaters. The only existing technology is an alarm based on the differential pressure limit between the air preheater inlet and outlet. An alarm is triggered when the differential pressure exceeds a set limit. Specifically, the health status of the air preheater is primarily determined by the differential pressure between the flue gas inlet and outlet; an alarm is triggered when the differential pressure exceeds a set limit. However, this method has the following problems: 1) Since the differential pressure of the air preheater is related to the operating conditions, judging the degree of blockage solely based on the differential pressure cannot distinguish between different operating conditions, making it difficult to intuitively obtain the blockage status of the air preheater; 2) Judging the health level through the differential pressure between the air preheater inlet and outlet only provides a vague conclusion about whether the air preheater is healthy at a certain moment, and does not provide an intuitive prediction of the healthy operating life of the air preheater. Summary of the Invention

[0004] Based on the above problems, this invention solves the technical problems of existing technologies that rely on air preheater differential pressure to determine the degree of blockage, which cannot distinguish between different operating conditions and make it difficult to intuitively obtain the air preheater blockage status; and that methods that determine the health status of the air preheater by the inlet and outlet differential pressure can only provide a vague conclusion on whether the air preheater is healthy at a certain moment, and cannot accurately predict the air preheater's lifespan. The air preheater healthy operating life prediction method provided by this invention can predict the air preheater's healthy operating lifespan in real time, allowing operators to intuitively understand the air preheater's health status and remaining operating life, and providing adjustment suggestions based on the lifespan reduction rate, thereby achieving the goal of monitoring air preheater operation and extending its service life.

[0005] This invention proposes a method for predicting the healthy operating life of an air preheater, comprising: The relative blockage differential pressure of the air preheater is calculated based on the actual differential pressure of the air preheater, the flue gas volume under rated load conditions, and the actual flue gas volume. A predictive model for the healthy operating life of the air preheater is constructed based on the relative blocking differential pressure of the air preheater. Early warning of reduced air preheater health life is provided based on the air preheater health life prediction model.

[0006] Furthermore, the calculation of the relative blockage differential pressure of the air preheater based on the actual differential pressure of the air preheater, the flue gas volume under rated load conditions, and the actual flue gas volume includes: , in: The actual differential pressure at time k. This refers to the flue gas volume under rated load conditions. Let k be the actual flue gas volume at time k.

[0007] In addition, the relative blockage differential pressure is corrected based on the relative blockage differential pressure deviation value at each flue gas flow rate when the air preheater is activated: , This is a correction factor related to flue gas flow rate.

[0008] Furthermore, the method for constructing a predictive model for the healthy operating life of the air preheater based on the relative blocking differential pressure of the air preheater includes: The remaining healthy operating life of the air preheater is : , Where T represents the air preheater overhaul cycle. The air preheater health differential pressure threshold; Taking the differential pressure change during a major overhaul cycle of the air preheater as a reference, the initial rated differential pressure of the air preheater is: Then, under the rated operating conditions of the air preheater during this operating cycle, the maximum permissible differential pressure for healthy operation is: ,but The following formula is used for calculation: .

[0009] In addition, a moving average algorithm was added to the air preheater health life prediction model to increase prediction stability. The moving average algorithm uses a data volume of N to determine the average remaining healthy life of the air preheater. for: .

[0010] Furthermore, the method of providing early warning of reduced air preheater health operating life based on the air preheater health operating life prediction model includes: Let the lifespan reduction threshold be... The air preheater operates for a duration of If the overhaul cycle of the air preheater is T, then the remaining time of the overhaul cycle is... ; when In this case, an early warning is given regarding the reduction in the healthy operating life of the air preheater; when When this happens, an air preheater reset warning will be issued.

[0011] Furthermore, let the lifetime degradation rate threshold be... ,when At that time, an early warning is given for the air preheater's healthy operating life being reduced too quickly.

[0012] Furthermore, the method for constructing a predictive model for the healthy operating life of the air preheater based on the relative blocking differential pressure of the air preheater includes: Express the remaining healthy operating life of the air preheater as a linear change. : , Where T represents the air preheater overhaul cycle. The air preheater health differential pressure threshold; Taking the differential pressure change during a major overhaul cycle of the air preheater as a reference, the initial rated differential pressure of the air preheater is: Then, under the rated operating conditions of the air preheater during this operating cycle, the maximum permissible differential pressure for healthy operation is: ,but The following formula is used for calculation: .

[0013] The present invention also proposes an electronic device, comprising: At least one processor; and, A memory communicatively connected to at least one of the processors; wherein, The memory stores instructions that can be executed by at least one of the processors to enable at least one of the processors to perform the air preheater health life prediction method as described in any of the preceding claims.

[0014] The present invention also proposes a storage medium storing computer instructions, which, when executed by a computer, are used to perform the air preheater health operation life prediction method as described in any of the preceding claims.

[0015] This invention addresses the technical problems of existing technologies that rely on differential pressure to determine the degree of blockage in air preheaters, which cannot differentiate between different operating conditions and make it difficult to intuitively obtain information about air preheater blockage. Furthermore, methods that determine the health status of air preheaters based on inlet and outlet differential pressure only provide a vague conclusion about the health of the air preheater at a specific moment, failing to accurately predict its lifespan. The air preheater healthy operating life prediction method provided by this invention enables real-time prediction of the air preheater's healthy operating life, allowing operators to intuitively understand the air preheater's health status and remaining operating life. It also provides adjustment suggestions based on the lifespan reduction rate, achieving the goal of monitoring air preheater operation and extending its service life. Attached Figure Description

[0016] Figure 1 A flowchart illustrating a method for calculating fault feature data according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the hardware structure of an electronic device provided in one embodiment of the present invention. Detailed Implementation

[0017] The present invention will be further described in detail below with reference to specific embodiments and accompanying drawings. This description is intended only to illustrate specific embodiments of the invention and does not constitute any limitation on the invention. The scope of protection of the invention is defined by the claims.

[0018] Reference Figure 1 This invention proposes a method for predicting the healthy operating life of an air preheater, comprising: Step S001: Calculate the relative blockage differential pressure of the air preheater based on the actual differential pressure of the air preheater, the flue gas volume under rated load conditions, and the actual flue gas volume. Step S002: Construct a predictive model for the healthy operating life of the air preheater based on the relative blocking differential pressure of the air preheater. Step S003: Based on the air preheater healthy operating life prediction model, conduct early warning of damage reduction in the air preheater's healthy operating life.

[0019] In step S001, to facilitate a direct understanding of the air preheater's blocking process, the relative blocking differential pressure of the air preheater is calculated by converting the real-time operating differential pressure of the air preheater to the differential pressure of the air preheater under rated load.

[0020] Optionally, the relative blockage differential pressure of the air preheater is calculated based on the actual differential pressure of the air preheater, the flue gas volume under rated load conditions, and the actual flue gas volume, including:

[0021] in: The actual differential pressure at time k. This refers to the flue gas volume under rated load conditions. Let k be the actual flue gas volume at time k.

[0022] Optionally, to ensure the accuracy of the relative blocking differential pressure, the relative blocking differential pressure can be corrected based on the deviation of the relative blocking differential pressure under each flue gas flow rate when the air preheater is activated.

[0023] The relative blockage differential pressure is corrected based on the relative blockage differential pressure deviation values ​​at various flue gas flow rates when the air preheater is activated:

[0024] This is a correction factor related to flue gas flow rate. Its value is the difference between the relative blocking differential pressure and the actual differential pressure at different flue gas flow rates when the air preheater is initially installed or restarted after cleaning.

[0025] In step S002, constructing a predictive model for the healthy operating life of the air preheater based on the relative blocking differential pressure of the air preheater includes: The remaining healthy operating life of the air preheater is : , Where T represents the air preheater overhaul cycle. The air preheater health differential pressure threshold; Taking the differential pressure change during a major overhaul cycle of the air preheater as a reference, the initial rated differential pressure of the air preheater is: Then, under the rated operating conditions of the air preheater during this operating cycle, the maximum permissible differential pressure for healthy operation is: ,but The following formula is used for calculation: .

[0026] K represents time, measured in seconds.

[0027] The principle behind the construction of the air preheater health operation life prediction model is as follows: the model state is described by an exponential function over time, then standardized by the ratio of the current performance state, and finally nonlinearly mapped by a logarithmic curve to obtain a more intuitive and accurate model state assessment result.

[0028] It is the ratio of the current relative blocking differential pressure to the maximum allowable air preheater health differential pressure threshold, used to quantify the performance status of the model at a certain moment.

[0029] This is a standard exponential function form, often used to describe a process that gradually approaches a certain limit value over time.

[0030] Multiplying the output of the exponential function by the ratio of the current performance state yields a composite index m, where m = By utilizing the properties of the logarithmic function, m can be mapped onto the logarithmic curve. Logarithmic curves better reflect the nonlinear changes in the model's state over time. m, as an intermediate variable, connects the exponential function and the logarithmic curve, reflecting the deviation between the current state and the ideal state.

[0031] Alternatively, the remaining healthy operating life of the air preheater can also be represented by a linear variation. : , Where T represents the air preheater overhaul cycle. The air preheater health differential pressure threshold.

[0032] In step S003, the air preheater's healthy operating life is reduced and warned according to the air preheater healthy operating life prediction model: the warning is given by judging the remaining time of the overhaul cycle and the size of the life reduction threshold by setting a life reduction threshold.

[0033] Optionally, the lifetime reduction threshold is set as follows: The air preheater operates for a duration of If the overhaul cycle of the air preheater is T, then the remaining time of the overhaul cycle is... ; when In this case, an early warning is given regarding the reduction in the healthy operating life of the air preheater; when When this happens, an air preheater reset warning will be issued.

[0034] Optionally, the lifetime degradation rate threshold is set as follows: ,when At that time, an early warning is given for the air preheater's healthy operating life being reduced too quickly.

[0035] This invention addresses the technical problems of existing technologies that rely on differential pressure to determine the degree of blockage in air preheaters, which cannot differentiate between different operating conditions and make it difficult to intuitively obtain information about air preheater blockage. Furthermore, methods that determine the health status of air preheaters based on inlet and outlet differential pressure only provide a vague conclusion about the health of the air preheater at a specific moment, failing to accurately predict its lifespan. The air preheater healthy operating life prediction method provided by this invention enables real-time prediction of the air preheater's healthy operating life, allowing operators to intuitively understand the air preheater's health status and remaining operating life. It also provides adjustment suggestions based on the lifespan reduction rate, achieving the goal of monitoring air preheater operation and extending its service life.

[0036] In one embodiment, calculating the relative blockage differential pressure of the air preheater based on the actual differential pressure of the air preheater, the flue gas volume under rated load conditions, and the actual flue gas volume includes:

[0037] in: The actual differential pressure at time k. This refers to the flue gas volume under rated load conditions. Let k be the actual flue gas volume at time k.

[0038] To facilitate a more intuitive understanding of the air preheater blocking process, the relative blocking differential pressure of the air preheater is calculated by converting the real-time operating differential pressure of the air preheater to the differential pressure of the air preheater under rated load, thus preparing for subsequent prediction models.

[0039] In one embodiment, the relative blockage differential pressure is corrected based on the relative blockage differential pressure deviation value at each flue gas flow rate when the air preheater is activated:

[0040] This is a correction factor related to flue gas flow rate.

[0041] To ensure the accuracy of the relative blocking differential pressure, the relative blocking differential pressure can be corrected based on the deviation of the relative blocking differential pressure at various flue gas flow rates when the air preheater is activated. The value is the difference between the relative blocking differential pressure and the actual differential pressure under different flue gas flow rates when the air preheater is initially installed or restarted after cleaning.

[0042] In one embodiment, constructing a predictive model for the healthy operating life of the air preheater based on the relative blocking differential pressure of the air preheater includes: The remaining healthy operating life of the air preheater is :

[0043] Where T represents the air preheater overhaul cycle. The air preheater health differential pressure threshold; Taking the differential pressure change during a major overhaul cycle of the air preheater as a reference, the initial rated differential pressure of the air preheater is: Then, under the rated operating conditions of the air preheater during this operating cycle, the maximum permissible differential pressure for healthy operation is: ,but The following formula is used for calculation: .

[0044] When constructing the air preheater healthy operating life prediction model, the differential pressure change during a major overhaul cycle of the air preheater is used as a reference, and the air preheater healthy differential pressure threshold is set as follows: The initial rated differential pressure of the air preheater is Then, under rated operating conditions, the maximum permissible differential pressure for healthy operation of the air preheater during this operating cycle is: , All three conditions must be met: The air preheater health differential pressure threshold is calculated using this formula. The overhaul cycle for the air preheater is T (in seconds).

[0045] The principle behind the construction of the air preheater health operation life prediction model is as follows: the model state is described by an exponential function over time, then standardized by the ratio of the current performance state, and finally nonlinearly mapped by a logarithmic curve to obtain a more intuitive and accurate model state assessment result.

[0046] It is the ratio of the current relative blocking differential pressure to the maximum allowable air preheater health differential pressure threshold, used to quantify the performance status of the model at a certain moment.

[0047] This is a standard exponential function form, often used to describe a process that gradually approaches a certain limit value over time.

[0048] Multiplying the output of the exponential function by the ratio of the current performance state yields a composite index m, where m = By utilizing the properties of the logarithmic function, m can be mapped onto the logarithmic curve. Logarithmic curves better reflect the nonlinear changes in the model's state over time. m, as an intermediate variable, connects the exponential function and the logarithmic curve, reflecting the deviation between the current state and the ideal state.

[0049] In one embodiment, a moving average algorithm is added to the air preheater health life prediction model to increase prediction stability. The moving average algorithm selects a data volume of N, then the average remaining health life of the air preheater is calculated. for:

[0050] To improve prediction stability, a moving average algorithm is introduced to assess the remaining healthy operating life of the air preheater. Perform data smoothing to reduce the impact of noise.

[0051] In one embodiment, the step of providing early warning of reduced air preheater health life based on the air preheater health life prediction model includes: Let the lifespan reduction threshold be... The air preheater operates for a duration of If the overhaul cycle of the air preheater is T, then the remaining time of the overhaul cycle is... ; when In this case, an early warning is given regarding the reduction in the healthy operating life of the air preheater; when When this happens, an air preheater reset warning will be issued.

[0052] By setting a lifespan reduction threshold, the remaining time of the overhaul cycle is... The system compares the data with a lifespan reduction threshold to provide either an early warning of reduced healthy operating lifespan for the air preheater or an air preheater reset warning. The air preheater reset warning returns the monitoring system to normal operation, ensuring the consistency of the warning's trigger-cancellation logic and preventing continuous interference from false alarms. Only after a reset can the warning be effectively triggered again if the difference exceeds the threshold again.

[0053] In one embodiment, the lifetime degradation rate threshold is set to... ,when At that time, an early warning is given for the air preheater's healthy operating life being reduced too quickly.

[0054] An early warning of rapid decline in the healthy operating life of the air preheater will prompt operators to adjust the operating mode and increase the frequency of air preheater soot blowing, thereby extending the life of the air preheater.

[0055] In one embodiment, constructing a predictive model for the healthy operating life of the air preheater based on the relative blocking differential pressure of the air preheater includes: Express the remaining healthy operating life of the air preheater as a linear change. :

[0056] Where T represents the air preheater overhaul cycle. The air preheater health differential pressure threshold; Taking the differential pressure change during a major overhaul cycle of the air preheater as a reference, the initial rated differential pressure of the air preheater is: Then, under the rated operating conditions of the air preheater during this operating cycle, the maximum permissible differential pressure for healthy operation is: ,but The following formula is used for calculation: .

[0057] The air preheater's healthy operating life prediction model can also be represented by linear variation.

[0058] Reference Figure 2 The present invention also proposes a hardware structure diagram of an electronic device, comprising: At least one processor 301; and, A memory 302 communicatively connected to at least one of the processors 301; wherein, The memory 302 stores instructions that can be executed by at least one processor, which enables the at least one processor to perform the air preheater health life prediction method as described above.

[0059] Figure 2Take processor 301 as an example.

[0060] The electronic device is preferably a controller. The electronic device may also include an input device 303 and a display device 304.

[0061] The processor 301, memory 302, input device 303 and display device 304 can be connected by a bus or other means. The figure shows an example of connection by bus.

[0062] Memory 302, as a non-volatile computer-readable storage medium, can be used to store non-volatile software programs, non-volatile computer-executable programs, and modules, such as the program instructions / modules corresponding to the air preheater health operation life prediction method in the embodiments of this application, for example, Figure 1 The method flow is shown. The processor 301 executes various functional applications and data processing by running non-volatile software programs, instructions, and modules stored in the memory 302, thereby realizing the air preheater healthy operating life prediction method in the above embodiments.

[0063] Memory 302 may include a program storage area and a data storage area. The program storage area may store an operating system and applications required for at least one function; the data storage area may store data created based on the use of the air preheater health lifetime prediction method, etc. Furthermore, memory 302 may include high-speed random access memory and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other non-volatile solid-state storage device. In some embodiments, memory 302 may optionally include memory remotely located relative to processor 301, and these remote memories may be connected via a network to the apparatus performing the air preheater health lifetime prediction method. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0064] Input device 303 can receive user clicks and generate signal inputs related to user settings and function control of the air preheater healthy operating life prediction method. Display device 304 may include display devices such as a display screen.

[0065] One or more modules are stored in the memory 302, and when run by one or more processors 301, the air preheater health operation life prediction method in any of the above method embodiments is executed.

[0066] One embodiment of the present invention provides a storage medium that stores computer instructions, which, when executed by a computer, are used to perform all the steps of the air preheater health operation life prediction method as described above.

[0067] In the context of this disclosure, a storage 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. The storage medium can be a machine-readable signal medium or a machine-readable storage medium. Optionally, the storage medium can be a non-transitory computer-readable storage medium, such as a ROM, random access memory (RAM), compact disc ROM (CD-ROM), magnetic tape, floppy disk, and optical data storage device.

[0068] The above description is merely the principle and preferred embodiment of the present invention. It should be noted that, for those skilled in the art, several other modifications can be made based on the principle of the present invention, and these modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for predicting the healthy operating life of an air preheater, characterized in that, include: The relative blockage differential pressure of the air preheater is calculated based on the actual differential pressure of the air preheater, the flue gas volume under rated load conditions, and the actual flue gas volume. A predictive model for the healthy operating life of the air preheater is constructed based on the relative blocking differential pressure of the air preheater. Early warning of reduced air preheater health life is provided based on the air preheater health life prediction model.

2. The method for predicting the healthy operating life of an air preheater according to claim 1, characterized in that, The calculation of the relative blockage differential pressure of the air preheater based on the actual differential pressure of the air preheater, the flue gas volume under rated load conditions, and the actual flue gas volume includes: ， in: The actual differential pressure at time k. This refers to the flue gas volume under rated load conditions. Let k be the actual flue gas volume at time k.

3. The method for predicting the healthy operating life of an air preheater according to claim 2, characterized in that, The relative blockage differential pressure is corrected based on the relative blockage differential pressure deviation values ​​at various flue gas flow rates when the air preheater is activated: ， This is a correction factor related to flue gas flow rate.

4. The method for predicting the healthy operating life of an air preheater according to claim 3, characterized in that, The method for constructing a healthy operating life prediction model for the air preheater based on the relative blocking differential pressure of the air preheater includes: The remaining healthy operating life of the air preheater is : ， Where T represents the air preheater overhaul cycle. The air preheater health differential pressure threshold; Taking the differential pressure change during a major overhaul cycle of the air preheater as a reference, the initial rated differential pressure of the air preheater is: Then, under the rated operating conditions of the air preheater during this operating cycle, the maximum permissible differential pressure for healthy operation is: ,but The following formula is used for calculation: 。 5. The method for predicting the healthy operating life of an air preheater according to claim 4, characterized in that, To increase prediction stability, a moving average algorithm is added to the air preheater health life prediction model. The moving average algorithm uses a data volume of N to calculate the average remaining health life of the air preheater. for: 。 6. The method for predicting the healthy operating life of an air preheater according to claim 5, characterized in that, The method of providing early warning of reduced air preheater health operation life based on the air preheater health operation life prediction model includes: Let the lifespan reduction threshold be... The air preheater operates for a duration of [duration missing]. If the overhaul cycle of the air preheater is T, then the remaining time of the overhaul cycle is... ; when In this case, an early warning is given regarding the reduction in the healthy operating life of the air preheater; when When this happens, an air preheater reset warning will be issued.

7. The method for predicting the healthy operating life of an air preheater according to claim 6, characterized in that, Let the lifetime degradation rate threshold be... ,when At that time, an early warning is given that the healthy operating life of the air preheater is being reduced too quickly.

8. The method for predicting the healthy operating life of an air preheater according to claim 3, characterized in that, The method for constructing a healthy operating life prediction model for the air preheater based on the relative blocking differential pressure of the air preheater includes: Express the remaining healthy operating life of the air preheater in terms of linear variation. : ， Where T represents the air preheater overhaul cycle. The air preheater health differential pressure threshold; Taking the differential pressure change during a major overhaul cycle of the air preheater as a reference, the initial rated differential pressure of the air preheater is: Then, under the rated operating conditions of the air preheater during this operating cycle, the maximum permissible differential pressure for healthy operation is: ,but The following formula is used for calculation: 。 9. An electronic device, characterized in that, include: At least one processor; as well as, A memory communicatively connected to at least one of the processors; wherein, The memory stores instructions that can be executed by at least one of the processors to enable at least one of the processors to perform the air preheater health life prediction method as described in any one of claims 1 to 8.

10. A storage medium, characterized in that, The storage medium stores computer instructions, which, when executed by the computer, are used to perform the air preheater health operation life prediction method as described in any one of claims 1 to 8.

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