Main steam temperature automatic regulation method, system and electronic equipment

Abstract

This invention provides an automatic main steam temperature regulation method, system, and electronic equipment, belonging to the field of thermal power generation. The method includes: acquiring the first-side main steam temperature, the first-side superheater temperature, the second-side main steam temperature, and the second-side superheater temperature of a thermal power unit; calculating a first temperature regulation value based on the first-side main steam temperature and the first-side superheater temperature; calculating a second temperature regulation value based on the second-side main steam temperature and the second-side superheater temperature; calculating a temperature compensation value based on the first-side main steam temperature and the second-side main steam temperature; and correcting the first and second temperature regulation values ​​based on the temperature compensation value. The corrected first temperature regulation value is used to adjust the opening of the first-side desuperheating water valve of the thermal power unit, and the corrected second temperature regulation value is used to adjust the opening of the second-side desuperheating water valve of the thermal power unit. This invention features fast regulation speed, simple and convenient operation, and solves the common problem of frequent deviations in main steam temperature during the operation of thermal power plants.

Description

Technical Field

[0001] This invention relates to the field of thermal power generation, specifically to an automatic main steam temperature regulation method, a system for automatic main steam temperature regulation, an electronic device, and a computer-readable storage medium. Background Technology

[0002] Currently, most thermal power plant unit main steam temperature regulation designs use a series regulation system where the temperatures of the main steam pipes on both sides and the superheated steam pipes are each connected. The superheater temperature is regulated by the desuperheating water regulating valves on the pipes, which ultimately regulates the main steam temperature.

[0003] Since each side of the temperature control system is a series control system consisting of the main steam temperature and the superheater temperature on that side, and the main steam temperature and superheater temperature on both sides are not correlated, it is very difficult to completely eliminate the temperature deviation between the two sides.

[0004] Excessive temperature deviation between the two sides will directly cause the steam temperature entering the turbine to approach or exceed the turbine's design allowable steam temperature value. If the temperature exceeds the turbine's design operating condition, it will cause changes in other turbine operating parameters, such as pressure, temperature, enthalpy drop, efficiency, reaction degree, and axial thrust at various stages. These changes will not only affect the turbine's operating economy but also pose potential risks to the unit's stable operation. Conversely, when the temperature is below the design operating condition value, the steam system's cycle thermal efficiency will decrease. Under constant load, the main steam flow rate will inevitably increase, increasing the turbine's wet steam loss and reducing its operating efficiency. Summary of the Invention

[0005] The purpose of this invention is to provide an automatic main steam temperature regulation method, system, and electronic equipment to solve the problem of operational difficulties when eliminating the temperature deviation of the main steam on both sides of a thermal power plant unit.

[0006] To achieve the above objectives, the present invention provides a method for automatic adjustment of main steam temperature, the method comprising:

[0007] The temperature of the main steam on the first side, the temperature of the superheater on the first side, the temperature of the main steam on the second side, and the temperature of the superheater on the second side of the thermal power unit are obtained.

[0008] The first temperature adjustment value is calculated based on the first side main steam temperature and the first side superheater temperature.

[0009] The second temperature adjustment value is calculated based on the main steam temperature on the second side and the superheater temperature on the second side.

[0010] Calculate the temperature compensation value based on the main steam temperature on the first side and the main steam temperature on the second side.

[0011] The first and second temperature adjustment values ​​are corrected based on the temperature compensation value to obtain the corrected first and second temperature adjustment values.

[0012] The corrected first temperature adjustment value is used to adjust the opening of the first desuperheating water valve of the thermal power unit, and the corrected second temperature adjustment value is used to adjust the opening of the second desuperheating water valve of the thermal power unit.

[0013] Preferably, calculating the first temperature adjustment value based on the first-side main steam temperature and the first-side superheater temperature includes:

[0014] Based on the first PID controller, the main steam temperature on the first side and the preset temperature are processed to obtain the first regulation signal, wherein the preset temperature is the target value of the main steam temperature of the turbine under stable load;

[0015] Based on the second PID controller, the first regulation signal and the temperature of the first side superheater are processed to obtain the first temperature regulation value.

[0016] Preferably, calculating the second temperature adjustment value based on the second-side main steam temperature and the second-side superheater temperature includes:

[0017] Based on the third PID controller, the main steam temperature on the second side and the preset temperature are processed to obtain the second regulation signal. The preset temperature is the target value of the main steam temperature of the turbine when the load is stable.

[0018] Based on the fourth PID controller, the second regulation signal and the temperature of the second-side superheater are processed to obtain the second temperature regulation value.

[0019] Preferably, the temperature compensation value is calculated based on the first-side main steam temperature and the second-side main steam temperature, including:

[0020] Calculate the difference between the main steam temperature on the first side and the main steam temperature on the second side;

[0021] Determine whether the difference has reached the preset upper limit of deviation;

[0022] When the difference reaches the preset upper limit of deviation, the difference is integrated based on the integrator, and the integration result is used as the temperature compensation value.

[0023] Preferably, the method further includes: stopping the integration operation on the difference when the difference is lower than a preset deviation lower limit.

[0024] Preferably, the correction operation of the first temperature adjustment value is: to add the temperature compensation value to the first temperature adjustment value in a positive direction.

[0025] Preferably, the correction operation of the second temperature adjustment value is: superimposing the temperature compensation value on the second temperature adjustment value in reverse.

[0026] The present invention also provides an automatic main steam temperature regulation system, the system being used to implement the above-described automatic main steam temperature regulation method, the system comprising:

[0027] The acquisition module is used to acquire the first-side main steam temperature, the first-side superheater temperature, the second-side main steam temperature, and the second-side superheater temperature of the thermal power unit.

[0028] The first calculation module is used to calculate the first temperature adjustment value based on the first side main steam temperature and the first side superheater temperature.

[0029] The second calculation module is used to calculate the second temperature adjustment value based on the second-side main steam temperature and the second-side superheater temperature.

[0030] The third calculation module is used to calculate the temperature compensation value based on the main steam temperature on the first side and the main steam temperature on the second side.

[0031] The correction module is used to correct the first temperature adjustment value and the second temperature adjustment value according to the temperature compensation value to obtain the corrected first temperature adjustment value and the second temperature adjustment value; wherein, the corrected first temperature adjustment value is used to adjust the opening of the first side desuperheating water valve of the thermal power unit, and the corrected second temperature adjustment value is used to adjust the opening of the second side desuperheating water valve of the thermal power unit.

[0032] The present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the above-described automatic main steam temperature regulation method.

[0033] The present invention also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the above-described automatic main steam temperature regulation method.

[0034] Through the above technical solution, the present invention has at least the following technical effects:

[0035] This invention calculates a temperature compensation value based on the first and second main steam temperatures, uses this compensation value to correct the first and second temperature adjustment values, and then uses these corrected values ​​to adjust the opening of the desuperheating water valves on both sides of the thermal power unit, thereby eliminating the temperature deviation of the main steam on both sides of the unit. This method offers advantages such as fast adjustment speed, simple and convenient operation, and solves the common problem of frequent deviations in main steam temperature during the operation of thermal power plants.

[0036] Other features and advantages of the embodiments of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0037] 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:

[0038] Figure 1 This is a flowchart of an automatic main steam temperature adjustment method provided in one embodiment of the present invention;

[0039] Figure 2 This is a block diagram of an automatic main steam temperature regulation system provided in one embodiment of the present invention. Detailed Implementation

[0040] 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.

[0041] Figure 1 This is a flowchart of an automatic main steam temperature adjustment method provided by one embodiment of the present invention, as shown below. Figure 1 As shown, an automatic main steam temperature regulation method includes:

[0042] Step S101: Obtain the first-side main steam temperature, the first-side superheater temperature, the second-side main steam temperature, and the second-side superheater temperature of the thermal power unit; In this embodiment, the thermal power unit mainly includes a steam turbine and a boiler, which are used to adjust the first-side main steam temperature and the second-side main steam temperature of the steam turbine, and can also be used to adjust the first-side main steam temperature and the second-side main steam temperature of the boiler.

[0043] Step S102: Calculate the first temperature adjustment value based on the first side main steam temperature and the first side superheater temperature.

[0044] As a further optimization of this embodiment, the calculation of the first temperature adjustment value based on the first-side main steam temperature and the first-side superheater temperature includes:

[0045] Step a01: Based on the first PID controller, the main steam temperature on the first side and the preset temperature are processed to obtain the first regulation signal; wherein the preset temperature is the target value of the main steam temperature of the turbine when the load is stable, that is, the main steam temperature on the first side and the preset temperature are used as the input of the first PID controller, and after the integral and derivative regulation of the first PID controller, the first regulation signal is output.

[0046] Step a02: Based on the second PID controller, process the first regulation signal and the temperature of the first side superheater to obtain the first temperature regulation value.

[0047] In this embodiment, the first adjustment signal and the temperature of the first-side superheater are used as inputs to the second PID controller. After integral and derivative adjustment by the second PID controller, the first temperature adjustment value is output. The first temperature adjustment value can be used as control information for the desuperheating water valve on the turbine pipeline, thereby controlling the opening of the desuperheating water valve, adjusting the flow rate of the desuperheating water, and finally achieving the adjustment of the temperature of the main steam on the first side of the turbine.

[0048] Step S103: Calculate the second temperature adjustment value based on the second side main steam temperature and the second side superheater temperature.

[0049] As a further optimization of this embodiment, the calculation of the second temperature adjustment value based on the second-side main steam temperature and the second-side superheater temperature includes:

[0050] Step b01: Based on the third PID controller, process the main steam temperature on the second side and the preset temperature to obtain the second regulation signal;

[0051] In this embodiment, the preset temperature is the target value of the main steam temperature of the turbine under stable load. That is, the second-side main steam temperature and the preset temperature are used as inputs to the third PID controller. After integral and derivative regulation by the third PID controller, the second regulation signal is output.

[0052] Step b02: Based on the fourth PID controller, process the second regulation signal and the temperature of the second-side superheater to obtain the second temperature regulation value.

[0053] In this embodiment, the second adjustment signal and the temperature of the second-side superheater are used as inputs to the fourth PID controller. After integral and derivative adjustment by the fourth PID controller, the second temperature adjustment value is output. The second temperature adjustment value can be used as control information for the desuperheating water valve on the turbine pipeline, thereby controlling the opening of the desuperheating water valve, adjusting the flow rate of the desuperheating water, and finally achieving the adjustment of the main steam temperature on the second side of the turbine.

[0054] Step S104: Calculate the temperature compensation value based on the first side main steam temperature and the second side main steam temperature;

[0055] As a further optimization of this embodiment, the temperature compensation value is calculated based on the first-side main steam temperature and the second-side main steam temperature, including:

[0056] Step c01: Calculate the difference between the first side main steam temperature and the second side main steam temperature. In this embodiment, the first side main steam temperature and the second side main steam temperature can be used as inputs to a subtractor, and the difference between the first side main steam temperature and the second side main steam temperature can be calculated in the subtractor.

[0057] Step c02: Determine whether the difference has reached the preset deviation upper limit;

[0058] Step c03: When the difference reaches the preset deviation upper limit, the difference is integrated based on the integrator, and the integration result is used as the temperature compensation value.

[0059] In this embodiment, when performing an integral operation on the difference between the first-side main steam temperature and the second-side main steam temperature, the integration interval is [T]. min ,T max ], where T min T is the preset lower limit of deviation. max This is the preset upper limit for deviation.

[0060] Step S105: Correct the first temperature adjustment value and the second temperature adjustment value according to the temperature compensation value to obtain the corrected first temperature adjustment value and the second temperature adjustment value; wherein, the corrected first temperature adjustment value is used to adjust the opening of the first side desuperheating water valve of the thermal power unit, and the corrected second temperature adjustment value is used to adjust the opening of the second side desuperheating water valve of the thermal power unit.

[0061] As a further optimization of this embodiment, the correction operation for the first temperature adjustment value is as follows: the temperature compensation value is added to the first temperature adjustment value in a positive direction, that is, the formula for calculating the corrected first temperature adjustment value is:

[0062] T1=T a + T;

[0063] In the formula, T1 is the corrected first temperature adjustment value, T a This is the first temperature adjustment value. T is the temperature compensation value.

[0064] The corrected first temperature regulation value is input into the controller of the first-side desuperheating water valve. The opening of the first-side desuperheating water valve is adjusted, and the flow rate of the desuperheating water is adjusted, thereby realizing the regulation of the first-side main steam temperature of the steam turbine.

[0065] In this embodiment, the method further includes: stopping the integration operation on the difference when the difference is lower than a preset deviation lower limit.

[0066] As a further optimization of this embodiment, the correction operation for the second temperature adjustment value is as follows: the temperature compensation value is superimposed on the second temperature adjustment value in reverse, that is, the formula for calculating the corrected second temperature adjustment value is:

[0067] T2=T b - T;

[0068] In the formula, T2 is the corrected second temperature adjustment value, and T b This is the second temperature adjustment value. T is the temperature compensation value.

[0069] The corrected second temperature regulation value is input into the controller of the second-side desuperheating water valve. The opening of the second-side desuperheating water valve is adjusted, and the flow rate of the desuperheating water is adjusted, thereby achieving the regulation of the second-side main steam temperature of the turbine.

[0070] In this embodiment, when a deviation occurs in the main steam temperature on both sides of the turbine or boiler of a thermal power unit, and the deviation gradually increases to a preset upper limit, the integrator begins to perform an integral calculation on the difference between the main steam temperature on the first side and the main steam temperature on the second side. The calculation result is used as a temperature compensation value. This compensation value is used to correct the first and second temperature adjustment values, thereby eliminating the temperature deviation between the main steam temperatures on the first and second sides. Therefore, increasing the desuperheating water flow on the side of the turbine or boiler with the higher main steam temperature will lower the temperature; conversely, decreasing the desuperheating water flow on the side with the lower main steam temperature will raise the temperature. This process continues until the temperature deviation on both sides gradually decreases and is completely eliminated. When the temperature deviation on both sides decreases to a lower limit, the integrator stops the integral calculation, and the desuperheating water flow on both sides will no longer change due to the temperature deviation.

[0071] This invention solves the common problem of frequent deviations in main steam temperature during operation of thermal power plants by simply optimizing the logic program without changing any hardware.

[0072] Figure 2 This is a block diagram of an automatic main steam temperature control system provided in one embodiment of the present invention, such as... Figure 2 As shown, an automatic main steam temperature regulation system is provided. The system is used to implement the aforementioned automatic main steam temperature regulation method. The system includes:

[0073] The acquisition module is used to acquire the main steam temperature on the first side, the superheater temperature on the first side, the main steam temperature on the second side, and the superheater temperature on the second side of the steam turbine.

[0074] The first calculation module is used to calculate the first temperature adjustment value based on the first side main steam temperature and the first side superheater temperature.

[0075] The second calculation module is used to calculate the second temperature adjustment value based on the second-side main steam temperature and the second-side superheater temperature.

[0076] The third calculation module is used to calculate the temperature compensation value based on the main steam temperature on the first side and the main steam temperature on the second side.

[0077] The correction module is used to correct the first temperature adjustment value and the second temperature adjustment value according to the temperature compensation value to obtain the corrected first temperature adjustment value and the second temperature adjustment value; wherein, the corrected first temperature adjustment value is used to adjust the opening of the first side desuperheating water valve of the thermal power unit, and the corrected second temperature adjustment value is used to adjust the opening of the second side desuperheating water valve of the thermal power unit.

[0078] This invention calculates a temperature compensation value based on the first and second main steam temperatures, uses this compensation value to correct the first and second temperature adjustment values, and then uses these corrected values ​​to adjust the opening of the desuperheating water valves on both sides of the thermal power unit, thereby eliminating the temperature deviation of the main steam on both sides of the unit. This method offers advantages such as fast adjustment speed, simple and convenient operation, and solves the common problem of frequent deviations in main steam temperature during the operation of thermal power plants.

[0079] This invention also provides an electronic device, including 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 above-described automatic main steam temperature regulation method.

[0080] This invention also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described automatic main steam temperature regulation method.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] 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 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0085] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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 automatically adjusting main steam temperature, characterized in that, The method includes: The temperature of the main steam on the first side, the temperature of the superheater on the first side, the temperature of the main steam on the second side, and the temperature of the superheater on the second side of the thermal power unit are obtained. The first temperature adjustment value is calculated based on the first-side main steam temperature and the first-side superheater temperature, including: Based on the first PID controller, the main steam temperature on the first side and the preset temperature are processed to obtain the first regulation signal, wherein the preset temperature is the target value of the main steam temperature of the turbine under stable load; Based on the second PID controller, the first regulation signal and the temperature of the first side superheater are processed to obtain the first temperature regulation value; The second temperature adjustment value is calculated based on the main steam temperature on the second side and the superheater temperature on the second side, including: Based on the third PID controller, the main steam temperature on the second side and the preset temperature are processed to obtain the second regulation signal. The preset temperature is the target value of the main steam temperature of the turbine when the load is stable. Based on the fourth PID controller, the second regulation signal and the temperature of the second-side superheater are processed to obtain the second temperature regulation value; The temperature compensation value is calculated based on the main steam temperature on the first side and the main steam temperature on the second side, including: Calculate the difference between the main steam temperature on the first side and the main steam temperature on the second side; Determine whether the difference has reached the preset upper limit of deviation; When the difference reaches the preset deviation limit, the difference is integrated based on the integrator, and the integration result is used as the temperature compensation value. The first and second temperature adjustment values ​​are corrected based on the temperature compensation value to obtain the corrected first and second temperature adjustment values. The correction operation for the first temperature adjustment value is as follows: the temperature compensation value is superimposed on the first temperature adjustment value in a positive direction; the correction operation for the second temperature adjustment value is as follows: the temperature compensation value is superimposed on the second temperature adjustment value in a negative direction; the corrected first temperature adjustment value is used to adjust the opening of the first desuperheating water valve of the thermal power unit, and the corrected second temperature adjustment value is used to adjust the opening of the second desuperheating water valve of the thermal power unit.

2. The method according to claim 1, characterized in that, Also includes: If the difference is lower than a preset deviation lower limit, the integration operation on the difference is stopped.

3. An automatic main steam temperature regulation system, said system being used to implement the automatic main steam temperature regulation method according to any one of claims 1-2, characterized in that, The system includes: The acquisition module is used to acquire the first-side main steam temperature, the first-side superheater temperature, the second-side main steam temperature, and the second-side superheater temperature of the thermal power unit. The first calculation module is used to calculate the first temperature adjustment value based on the first side main steam temperature and the first side superheater temperature. The second calculation module is used to calculate the second temperature adjustment value based on the second-side main steam temperature and the second-side superheater temperature. The third calculation module is used to calculate the temperature compensation value based on the main steam temperature on the first side and the main steam temperature on the second side. The correction module is used to correct the first temperature adjustment value and the second temperature adjustment value according to the temperature compensation value to obtain the corrected first temperature adjustment value and the second temperature adjustment value; wherein, the corrected first temperature adjustment value is used to adjust the opening of the first side desuperheating water valve of the thermal power unit, and the corrected second temperature adjustment value is used to adjust the opening of the second side desuperheating water valve of the thermal power unit.

4. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the automatic main steam temperature adjustment method according to any one of claims 1-2.

5. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the automatic main steam temperature adjustment method as described in any one of claims 1-2.

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