Method, device and equipment for reducing the number of overtemperature times of the wall temperature of an intermediate superheater

Abstract

The present application relates to the technical field of temperature control, and an embodiment thereof provides a method, device and equipment for reducing the number of general overtemperature times of the wall temperature of an intermediate superheater. The method for reducing the number of general overtemperature times of the wall temperature of the intermediate superheater comprises the following steps: determining factors affecting the wall temperature of the intermediate superheater, wherein the factors include the unit load change rate, fuel quality, boiler pressure, feed water flow and ash deposition condition; establishing a mapping relationship between each factor and the wall temperature of the intermediate superheater according to historical sample data, to obtain a plurality of mapping relationships; determining the factor having the greatest impact on the wall temperature of the intermediate superheater from the factors according to the plurality of mapping relationships; and determining the value of the factor having the greatest impact, to reduce the number of general overtemperature times of the wall temperature of the intermediate superheater. The embodiment provided by the present application can quickly determine the factors affecting the temperature of the intermediate superheater.

Description

Technical Field

[0001] This invention relates to the field of temperature control technology, specifically to a method for reducing the number of times the intermediate superheater wall temperature typically exceeds the set temperature, an apparatus for reducing the number of times the intermediate superheater wall temperature typically exceeds the set temperature, a device for reducing the number of times the intermediate superheater wall temperature typically exceeds the set temperature, and a computer-readable storage medium. Background Technology

[0002] When the unit experiences continuous load increases and decreases, its regulation performance is poor, particularly its main steam temperature regulation. This is often accompanied by high superheater surface temperatures, making main steam temperature control difficult. Furthermore, the superheater desuperheating water flow is frequently at full capacity, posing safety hazards. Additionally, the high superheater wall temperature limits the unit's load increase rate, impacting its economic efficiency.

[0003] A survey was conducted on the historical number of superheater wall temperature overheating incidents. Since minor overheating incidents are somewhat accidental when the boiler is operating at its target specifications, the number of typical overheating incidents was selected as a reference. Statistical analysis of the typical overheating incidents for each superheater tube in Unit 1 revealed that the intermediate superheater had the highest number of overheating incidents, accounting for 65%. Therefore, the goal was to reduce the wall temperature of the intermediate superheater in Unit 1, and improvements were made to the existing process flow or process parameters.

[0004] Typical overheating events refer to an intermediate superheater wall temperature exceeding 579℃ for more than five minutes. This is the meaning of "typical overheating" in this article and does not necessarily imply meeting the typical overheating assessment criteria in the new standard. Summary of the Invention

[0005] The purpose of this invention is to provide a method, apparatus, and equipment for reducing the number of times the intermediate superheater wall temperature generally exceeds the limit, so as to partially solve the above problems.

[0006] To achieve the above objective, a first aspect of the present invention provides a method for reducing the number of overheating events in an intermediate superheater wall, the method comprising:

[0007] Factors affecting the intermediate superheater wall temperature are identified, including unit load change rate, fuel quality, boiler pressure, feedwater flow rate, and ash accumulation. A mapping relationship between each factor and the intermediate superheater wall temperature is established based on historical sample data, resulting in multiple mapping relationships. The factor with the greatest impact on the intermediate superheater wall temperature is determined from these multiple mapping relationships. The value of the factor with the greatest impact is determined to reduce the number of times the intermediate superheater wall temperature typically exceeds its maximum.

[0008] Preferably, a mapping relationship between each factor and the intermediate superheater wall temperature is established based on historical sample data to obtain multiple mapping relationships, including: determining the corresponding range of variation for each factor and obtaining the distribution range of the factor in the historical sample data; judging the relationship between the range of variation and the distribution range of the factor; if the range of variation is not greater than the distribution range, a survey method is used to obtain the mapping relationship between the factor and the intermediate superheater wall temperature; if the range of variation is greater than the distribution range, an experimental method is used to obtain data and the obtained data is used to obtain the mapping relationship between the factor and the intermediate superheater wall temperature.

[0009] Preferably, the mapping relationship between factors and intermediate superheater wall temperature is obtained by survey method, including: grouping the historical sample data according to different dimensions, including time dimension and equipment dimension; obtaining the first fluctuation of factors and the second fluctuation of intermediate superheater wall temperature in each group; obtaining the mapping relationship based on the correlation between the first fluctuation and the second fluctuation, wherein the correlation belongs to one of the following sets of correlations: strong positive correlation, weak positive correlation, no correlation, weak negative correlation and strong negative correlation.

[0010] Preferably, the method of acquiring data through experimentation and obtaining a mapping relationship between factors and intermediate superheater wall temperature from the acquired data includes: determining the experimental conditions in the experimental method, wherein the experimental conditions include operating mode and operating parameters; acquiring intermediate superheater wall temperature through sensors to obtain a curve or table showing the correspondence between operating mode, operating parameters and intermediate superheater wall temperature; and using the curve or table as the mapping relationship between the factors and intermediate superheater wall temperature.

[0011] Preferably, the method further includes: obtaining the overheating time and peak temperature of the intermediate superheater wall temperature in the corresponding relationship curve or table; evaluating the total overheating time and the distribution of the peak temperature to obtain the evaluation result corresponding to the corresponding relationship curve or table.

[0012] Preferably, determining the factor with the greatest influence on the intermediate superheater wall temperature from the factors based on the multiple mapping relationships includes: if all the multiple mapping relationships are obtained by survey method, then the factor with the greatest influence is obtained according to the ranking of correlation; if all the multiple mapping relationships are obtained by experimental method, then the factor with the greatest influence is obtained according to the ranking of evaluation results; if the multiple mapping relationships are obtained by survey method and experimental method, the first factor with the greatest influence obtained by survey method is re-applied to experimental method to obtain the evaluation result corresponding to the factor, and the evaluation result is compared with the evaluation result of the second factor with the greatest influence obtained by experimental method, and the factor with the greatest influence is obtained according to the ranking result between the two.

[0013] Preferably, determining the value of the most influential factor includes: obtaining the distribution of the most influential factor during the overheating time of the intermediate superheater wall temperature from the historical sample data, or obtaining the distribution of the most influential factor during the overheating time of the intermediate superheater wall temperature from the corresponding relationship curve or table; removing the distribution corresponding to the overheating time from the possible distribution range of the most influential factor to obtain the value of the most influential factor.

[0014] In a second aspect of the invention, an apparatus for reducing the number of times the intermediate superheater wall temperature generally exceeds the overheating limit is also provided. The apparatus includes: a factor determination module for determining factors affecting the intermediate superheater wall temperature, the factors including unit load change rate, fuel quality, boiler pressure, feedwater flow rate, and ash accumulation status; a mapping determination module for establishing a mapping relationship between each factor and the intermediate superheater wall temperature based on historical sample data, thereby obtaining multiple mapping relationships; a factor selection module for determining the factor with the greatest impact on the intermediate superheater wall temperature from the factors based on the multiple mapping relationships; and a value determination module for determining the value of the factor with the greatest impact, so as to reduce the number of times the intermediate superheater wall temperature generally exceeds the overheating limit.

[0015] Preferably, a mapping relationship between each factor and the intermediate superheater wall temperature is established based on historical sample data to obtain multiple mapping relationships, including: determining the corresponding range of variation for each factor and obtaining the distribution range of the factor in the historical sample data; judging the relationship between the range of variation and the distribution range of the factor; if the range of variation is not greater than the distribution range, a survey method is used to obtain the mapping relationship between the factor and the intermediate superheater wall temperature; if the range of variation is greater than the distribution range, an experimental method is used to obtain data and the obtained data is used to obtain the mapping relationship between the factor and the intermediate superheater wall temperature.

[0016] Preferably, the mapping relationship between factors and intermediate superheater wall temperature is obtained by survey method, including: grouping the historical sample data according to different dimensions, including time dimension and equipment dimension; obtaining the first fluctuation of factors and the second fluctuation of intermediate superheater wall temperature in each group; obtaining the mapping relationship based on the correlation between the first fluctuation and the second fluctuation, wherein the correlation belongs to one of the following sets of correlations: strong positive correlation, weak positive correlation, no correlation, weak negative correlation and strong negative correlation.

[0017] Preferably, the method of acquiring data through experimentation and obtaining a mapping relationship between factors and intermediate superheater wall temperature from the acquired data includes: determining the experimental conditions in the experimental method, wherein the experimental conditions include operating mode and operating parameters; acquiring intermediate superheater wall temperature through sensors to obtain a curve or table showing the correspondence between operating mode, operating parameters and intermediate superheater wall temperature; and using the curve or table as the mapping relationship between the factors and intermediate superheater wall temperature.

[0018] Preferably, the method further includes: obtaining the overheating time and peak temperature of the intermediate superheater wall temperature in the corresponding relationship curve or table; evaluating the total overheating time and the distribution of the peak temperature to obtain the evaluation result corresponding to the corresponding relationship curve or table.

[0019] Preferably, determining the factor with the greatest influence on the intermediate superheater wall temperature from the factors based on the multiple mapping relationships includes: if all the multiple mapping relationships are obtained by survey method, then the factor with the greatest influence is obtained according to the ranking of correlation; if all the multiple mapping relationships are obtained by experimental method, then the factor with the greatest influence is obtained according to the ranking of evaluation results; if the multiple mapping relationships are obtained by survey method and experimental method, the first factor with the greatest influence obtained by survey method is re-applied to experimental method to obtain the evaluation result corresponding to the factor, and the evaluation result is compared with the evaluation result of the second factor with the greatest influence obtained by experimental method, and the factor with the greatest influence is obtained according to the ranking result between the two.

[0020] Preferably, determining the value of the most influential factor includes: obtaining the distribution of the most influential factor during the overheating time of the intermediate superheater wall temperature from the historical sample data, or obtaining the distribution of the most influential factor during the overheating time of the intermediate superheater wall temperature from the corresponding relationship curve or table; removing the distribution corresponding to the overheating time from the possible distribution range of the most influential factor to obtain the value of the most influential factor.

[0021] In a third aspect of the invention, an apparatus for reducing the general overheating number of intermediate superheater wall temperatures is also provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the computer program, implements the steps of the aforementioned method for reducing the general overheating number of intermediate superheater wall temperatures.

[0022] In a fourth aspect of the invention, a computer-readable storage medium is also provided, the storage medium storing instructions that, when executed on a computer, cause the computer to perform the steps of the aforementioned method for reducing the general overheating number of intermediate superheater wall temperatures.

[0023] A fifth aspect of the present invention provides a computer program product comprising a computer program that, when executed by a processor, implements the aforementioned method for reducing the number of overheating cycles of the intermediate superheater wall.

[0024] The above technical solution has at least the following beneficial effects:

[0025] (1) It can quickly identify the factors affecting the wall temperature of the intermediate superheater, providing a standard process for other optimization objectives.

[0026] (2) By optimizing the operating conditions of influencing factors, the number of times the intermediate superheater wall temperature exceeds the limit is reduced, the overheating shutdown time of the equipment is shortened, and the operating efficiency of the equipment is improved. Attached Figure Description

[0027] The accompanying drawings are provided to further illustrate embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. In the drawings:

[0028] Figure 1 This schematic diagram illustrates the steps of a method for reducing the number of overheating events in an intermediate superheater wall according to an embodiment of the present invention.

[0029] Figure 2 The schematic diagram illustrates the steps of a boiler primary superheating process according to an embodiment of the present invention;

[0030] Figure 3 The diagram illustrates the structure of an apparatus for reducing the number of overheating cycles of the intermediate superheater wall according to an embodiment of the present invention. Detailed Implementation

[0031] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of the present invention.

[0032] Figure 1 The illustration schematically depicts the steps of a method for reducing the number of overheating events in an intermediate superheater wall according to an embodiment of the present invention. Figure 1 As shown. The method includes:

[0033] S01. Determine the factors affecting the wall temperature of the intermediate superheater, including the unit load change rate, fuel quality, boiler pressure, feedwater flow rate, and ash accumulation status. Figure 2 A schematic diagram illustrating the steps of a boiler primary superheating process according to an embodiment of the present invention is shown. Figure 2As shown, the typical boiler primary superheating process includes: the working fluid (water) starts from the steam pump outlet, absorbs heat and vaporizes into steam in the water-cooled wall, and continues to absorb heat to become superheated steam. This steam then enters the primary superheater, screen superheater, intermediate superheater, and final superheater to be heated to the required main steam temperature, before entering the turbine to perform work. The rise in the water level of the storage tank was discussed, analyzed from several perspectives including personnel, machinery, materials, methods, and environment. The causes of the problem "rising water level in the storage tank, full opening of the desuperheating water, and high wall temperature in the intermediate superheater" were analyzed. A fishbone diagram was used to analyze the causes, identifying multiple end-factors, such as: unit load change rate, fuel quality, boiler pressure, feedwater flow rate, and ash accumulation.

[0034] S02. Based on historical sample data, establish a mapping relationship between each factor and the intermediate superheater wall temperature to obtain multiple mapping relationships;

[0035] S03. Based on the multiple mapping relationships, determine the factor that has the greatest impact on the wall temperature of the intermediate superheater from the factors; analyze each factor separately to obtain the analysis results of each factor as either a "non-factor" or a "factor".

[0036] S04. Determine the value of the most influential factor in order to reduce the number of times the intermediate superheater wall temperature generally exceeds the limit.

[0037] Through the above implementation methods, the main influencing factors of the intermediate superheater wall temperature can be quickly identified, thereby reducing the number of times the intermediate superheater wall temperature generally exceeds the limit by optimizing the operating parameters of the main influencing factors.

[0038] In some optional implementations, a mapping relationship between each factor and the intermediate superheater wall temperature is established based on historical sample data, resulting in multiple mapping relationships. This includes: determining the corresponding range of variation for each factor and obtaining the distribution range of that factor in the historical sample data; determining the relationship between the range of variation and the distribution range of the factor; if the range of variation is not greater than the distribution range, using a survey method to obtain the mapping relationship between the factor and the intermediate superheater wall temperature; if the range of variation is greater than the distribution range, using an experimental method to obtain data and using the obtained data to obtain the mapping relationship between the factor and the intermediate superheater wall temperature. A large amount of historical sample data is required in the analysis of influencing factors.

[0039] In some optional implementations, a survey method is used to obtain the mapping relationship between factors and intermediate superheater wall temperature, including: grouping the historical sample data according to different dimensions, including time and equipment dimensions; obtaining the first fluctuation of factors and the second fluctuation of intermediate superheater wall temperature in each group; and obtaining the mapping relationship based on the correlation between the first fluctuation and the second fluctuation, wherein the correlation belongs to one of the following sets of correlations: strong positive correlation, weak positive correlation, no correlation, weak negative correlation, and strong negative correlation. For example, in the analysis of unit load change rate, the data analysis through the time dimension is as follows: the load increase rate in 2018, 2019, and 2020 is statistically analyzed, and it is found that the rate of change of unit load in 2020 is higher than that in 2019, and the load change rate in 2018 is the same as that in 2019. Therefore, the load change rate is not a factor affecting the water level in the storage tank. For example, in the analysis of feedwater flow, the correlation between feedwater flow and load over three years was investigated, and the feedwater flow rates corresponding to Unit 1, Unit 2, and Unit 3 under different loads were statistically analyzed. Analysis of the statistical data shows that the feedwater flow and load of the units are basically correlated, with minimal deviation. Therefore, the load variation of Unit 1 matches the feedwater flow, and there is no issue of excessive feedwater flow leading to insufficient vaporization of the water-cooled walls, causing the intermediate superheater wall temperature to exceed the limit. Thus, feedwater flow is also considered a "non-factor."

[0040] In some optional embodiments, data is acquired using an experimental method, and the acquired data is used to determine the mapping relationship between factors and the intermediate superheater wall temperature. This includes: determining the experimental conditions in the experimental method, which include operating mode and operating parameters; collecting the intermediate superheater wall temperature through sensors to obtain a curve or table showing the correspondence between operating mode, operating parameters, and intermediate superheater wall temperature; and using the curve or table as the mapping relationship between the factors and the intermediate superheater wall temperature. For example, in the analysis of boiler pressure, the steps of the experimental method are as follows: during the low-load stage of the unit, the unit pressure control is switched from sliding pressure to constant pressure operation mode. The unit is tested at pressures of 16MPa, 17MPa, and 18MPa, where the load is reduced from 300MW to 270MW, and then immediately restored to a low-load swing of 300MW. The curve of the intermediate superheater wall temperature versus time during the test is obtained through data acquisition equipment such as sensors. Analysis of this curve yields the following experimental results: when the boiler is operating at low load, increasing the boiler pressure is beneficial for the control of the water level in the storage tank. There was no rise in the water level in the storage tank when the unit was operating at low loads with slight fluctuations. Moreover, the highest wall temperature of the intermediate superheater did not exceed 560°C.

[0041] In some optional embodiments, the method further includes: obtaining the overheating time and peak temperature of the intermediate superheater wall temperature in the corresponding relationship curve or table; evaluating the total overheating time and the distribution of the peak temperature to obtain the evaluation result corresponding to the corresponding relationship curve or table.

[0042] In some optional embodiments, determining the factor with the greatest influence on the intermediate superheater wall temperature from the factors based on the multiple mapping relationships includes: if all the multiple mapping relationships are obtained by survey method, then the factor with the greatest influence is obtained according to the ranking of correlation; if all the multiple mapping relationships are obtained by experimental method, then the factor with the greatest influence is obtained according to the ranking of evaluation results; if the multiple mapping relationships are obtained by survey method and experimental method, the first factor with the greatest influence obtained by survey method is re-applied to experimental method to obtain the evaluation result corresponding to the factor, and the evaluation result is compared with the evaluation result of the second factor with the greatest influence obtained by experimental method, and the factor with the greatest influence is obtained according to the ranking result between the two.

[0043] In some optional implementations, determining the value of the most influential factor includes: obtaining the distribution of the most influential factor during the overheating time of the intermediate superheater wall temperature from the historical sample data, or obtaining the distribution of the most influential factor during the overheating time of the intermediate superheater wall temperature from the corresponding relationship curve or table; removing the distribution corresponding to the overheating time from the possible distribution range of the most influential factor to obtain the value of the most influential factor. Specifically, by increasing the boiler operating pressure to 17 MPa at low load, the rise of the boiler water tank was compared under two conditions: a boiler pressure-up test and a boiler pressure-free test. The results show that, whether compared horizontally with the same year or vertically with 2019 and 2020, after the boiler adopted pressure-up measures, the water level in the water tank was effectively controlled, and the number of times the water level in the water tank exceeded 8m was significantly reduced, indicating that the pressure-up operation was effective. From August to September 2020, the number of overheating events generally decreased to an average of 1 time per month, achieving the preset target.

[0044] Based on the same inventive concept, the present invention also provides a device for reducing the number of times the intermediate superheater wall temperature generally exceeds the overheating limit. Figure 3 A schematic diagram of a device for reducing the number of overheating events in an intermediate superheater wall according to an embodiment of the present invention is shown. Figure 3As shown, an apparatus for reducing the number of times the intermediate superheater wall temperature generally exceeds the overheating limit includes: a factor determination module for determining factors affecting the intermediate superheater wall temperature, the factors including unit load change rate, fuel quality, boiler pressure, feedwater flow rate, and ash accumulation status; a mapping determination module for establishing a mapping relationship between each factor and the intermediate superheater wall temperature based on historical sample data, resulting in multiple mapping relationships; a factor selection module for determining the factor with the greatest impact on the intermediate superheater wall temperature from the factors based on the multiple mapping relationships; and a value determination module for determining the value of the factor with the greatest impact, so as to reduce the number of times the intermediate superheater wall temperature generally exceeds the overheating limit.

[0045] In some optional implementations, a mapping relationship between each factor and the intermediate superheater wall temperature is established based on historical sample data to obtain multiple mapping relationships, including: determining the corresponding range of variation for each factor and obtaining the distribution range of the factor in the historical sample data; determining the relationship between the range of variation and the distribution range of the factor; if the range of variation is not greater than the distribution range, a survey method is used to obtain the mapping relationship between the factor and the intermediate superheater wall temperature; if the range of variation is greater than the distribution range, an experimental method is used to obtain data and the obtained data is used to obtain the mapping relationship between the factor and the intermediate superheater wall temperature.

[0046] In some optional implementations, a survey method is used to obtain the mapping relationship between factors and intermediate superheater wall temperature, including: grouping the historical sample data according to different dimensions, including time dimension and equipment dimension; obtaining the first fluctuation of factors and the second fluctuation of intermediate superheater wall temperature in each group; obtaining the mapping relationship based on the correlation between the first fluctuation and the second fluctuation, wherein the correlation belongs to one of the following sets of correlations: strong positive correlation, weak positive correlation, no correlation, weak negative correlation, and strong negative correlation.

[0047] In some optional embodiments, data is acquired using an experimental method, and the acquired data is used to obtain a mapping relationship between factors and intermediate superheater wall temperature. This includes: determining the experimental conditions in the experimental method, the experimental conditions including operating mode and operating parameters; collecting intermediate superheater wall temperature through sensors to obtain a curve or table showing the correspondence between operating mode, operating parameters and intermediate superheater wall temperature; and using the curve or table as the mapping relationship between the factors and intermediate superheater wall temperature.

[0048] In some optional embodiments, the method further includes: obtaining the overheating time and peak temperature of the intermediate superheater wall temperature in the corresponding relationship curve or table; evaluating the total overheating time and the distribution of the peak temperature to obtain the evaluation result corresponding to the corresponding relationship curve or table.

[0049] In some optional embodiments, determining the factor with the greatest influence on the intermediate superheater wall temperature from the factors based on the multiple mapping relationships includes: if all the multiple mapping relationships are obtained by survey method, then the factor with the greatest influence is obtained according to the ranking of correlation; if all the multiple mapping relationships are obtained by experimental method, then the factor with the greatest influence is obtained according to the ranking of evaluation results; if the multiple mapping relationships are obtained by survey method and experimental method, the first factor with the greatest influence obtained by survey method is re-applied to experimental method to obtain the evaluation result corresponding to the factor, and the evaluation result is compared with the evaluation result of the second factor with the greatest influence obtained by experimental method, and the factor with the greatest influence is obtained according to the ranking result between the two.

[0050] In some optional implementations, determining the value of the most influential factor includes: obtaining the distribution of the most influential factor during the overheating time of the intermediate superheater wall temperature from the historical sample data, or obtaining the distribution of the most influential factor during the overheating time of the intermediate superheater wall temperature from the corresponding relationship curve or table; removing the distribution corresponding to the overheating time from the possible distribution range of the most influential factor to obtain the value of the most influential factor.

[0051] The specific limitations of each functional module in the aforementioned device for reducing the general overheating frequency of the intermediate superheater wall can be found in the limitations of the method for reducing the general overheating frequency of the intermediate superheater wall described above, and will not be repeated here. Each module in the aforementioned device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in or independent of the processor in a computer device in hardware form, or stored in the memory of a computer device in software form, so that the processor can call and execute the operations corresponding to each module.

[0052] In some embodiments of the present invention, an apparatus for reducing the general overheating number of intermediate superheater wall temperatures is also provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps of the aforementioned method for reducing the general overheating number of intermediate superheater wall temperatures. The processor here has numerical calculation and logical operation capabilities, and at least includes a central processing unit (CPU) with data processing capabilities, random access memory (RAM), read-only memory (ROM), various I / O ports, and an interrupt system. The processor contains a kernel that retrieves corresponding program units from the memory. One or more kernels can be configured, and the aforementioned method can be implemented by adjusting kernel parameters. The memory may include non-permanent memory in computer-readable media, random access memory (RAM), and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and includes at least one memory chip.

[0053] In one embodiment of the present invention, a computer-readable storage medium is also provided, wherein the storage medium stores instructions that, when executed on a computer, cause the processor to be configured to perform the above-described method for reducing the number of overheating cycles of the intermediate superheater wall.

[0054] In one embodiment of the present invention, a computer program product is provided, including a computer program that, when executed by a processor, implements the above-described method for reducing the number of overheating cycles of the intermediate superheater wall.

[0055] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0056] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0057] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0058] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0059] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0060] Memory may include non-persistent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0061] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0062] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0063] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A method for reducing the number of overheating events in an intermediate superheater wall, characterized in that, The method includes: The factors affecting the wall temperature of the intermediate superheater are identified, including the unit load change rate, fuel quality, boiler pressure, feedwater flow rate, and ash accumulation. Based on historical sample data, a mapping relationship between each factor and the intermediate superheater wall temperature is established, resulting in multiple mapping relationships; Based on the multiple mapping relationships, the factors that have the greatest impact on the intermediate superheater wall temperature are determined from the factors. Determine the value of the most influential factor in order to reduce the general number of overheating events of the intermediate superheater wall temperature; Based on historical sample data, a mapping relationship between each factor and the intermediate superheater wall temperature is established, resulting in multiple mapping relationships, including: For each factor, determine its corresponding range of variation and obtain the distribution range of that factor in the historical sample data; Determine the relationship between the range of variation and the range of distribution of factors; If the range of variation is not greater than the distribution range, a survey method is used to obtain the mapping relationship between the factor and the intermediate superheater wall temperature, including: grouping the historical sample data according to different dimensions, including time dimension and equipment dimension; obtaining the first fluctuation of the factor and the second fluctuation of the intermediate superheater wall temperature in each group; obtaining the mapping relationship based on the correlation between the first fluctuation and the second fluctuation, wherein the correlation belongs to one of the following sets of correlations: strong positive correlation, weak positive correlation, no correlation, weak negative correlation, and strong negative correlation; If the range of variation is greater than the distribution range, an experimental method is used to obtain data and the obtained data is used to obtain the mapping relationship between the factors and the intermediate superheater wall temperature. This includes: determining the experimental conditions in the experimental method, the experimental conditions including the operating mode and operating parameters; collecting the intermediate superheater wall temperature through sensors to obtain the corresponding relationship curve or table between the operating mode, operating parameters and intermediate superheater wall temperature; and using the corresponding relationship curve or table as the mapping relationship between the factors and the intermediate superheater wall temperature.

2. The method according to claim 1, characterized in that, The method further includes: Obtain the overheating time and peak temperature of the intermediate superheater wall temperature from the corresponding relationship curve or table; The total overheating time and the distribution of peak temperature are evaluated to obtain the evaluation results corresponding to the relationship curve or table.

3. The method according to claim 2, characterized in that, Based on the multiple mapping relationships, the factors that have the greatest impact on the intermediate superheater wall temperature are determined from the factors, including: If all the mapping relationships are obtained using a survey method, then the factors with the greatest influence are obtained based on the ranking of their relevance. If all the mapping relationships are obtained using an experimental method, then the factor with the greatest influence is obtained based on the ranking of the evaluation results; If the multiple mapping relationships are obtained using a survey method and an experimental method, the first most influential factor obtained by the survey method is re-applied to the experimental method to obtain the evaluation result corresponding to the first most influential factor. This evaluation result is then compared with the evaluation result of the second most influential factor obtained by the experimental method, and the most influential factor is obtained based on the ranking result between the two.

4. The method according to claim 1, characterized in that, Determine the values ​​of the factors that have the greatest impact, including: The distribution of the maximum factor during the overheating period of the intermediate superheater wall temperature can be obtained from the historical sample data, or from the distribution of the maximum factor during the overheating period of the intermediate superheater wall temperature in the corresponding relationship curve or table. The value of the most influential factor is obtained by removing the distribution corresponding to the overheating time from the possible distribution range of the largest factor.

5. A device for reducing the number of overheating events in an intermediate superheater wall, 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 computer program, it implements the steps of the method for reducing the general overheating number of intermediate superheater wall temperatures as described in any one of claims 1 to 4.

6. A computer-readable storage medium storing instructions that, when executed on a computer, cause the computer to perform the steps of the method for reducing the general overheating number of intermediate superheater wall temperatures as described in any one of claims 1 to 4.

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