Steam temperature system control method and device

Abstract

The invention relates to the technical field of temperature control, in particular to a steam temperature system control method and device. Acquiring current steam attribute parameters of the main steam pipeline of the power plant; comparing the current steam attribute parameter with a historical steam attribute parameter to obtain a parameter variable quantity of the steam attribute parameter; and the parameter variation is used for driving an overheating module or a temperature reduction module through the steam temperature control model to carry out steam temperature control, the steam temperature change trend is used as feedback, the steam temperature control precision and the reaction speed are improved, and the technical problems that in the prior art, the main steam temperature control precision is low, and the hysteresis quality is high are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of temperature control, and in particular to a steam temperature system control method and device. Background Art

[0002] Boiler main steam temperature is one of the key parameters for boiler control. Its effectiveness directly impacts steam quality and unit economic operation. Boiler main steam temperature is a complex controlled parameter with significant hysteresis. It can be affected by combustion variations, flue gas variations, changes in desuperheating water volume due to manual intervention, changes in external main steam load, and variations in primary and secondary air flow.

[0003] The traditional control scheme for main steam temperature generally adopts PID series control, but this method has poor control accuracy, strong hysteresis, and poor steam temperature control effect. Summary of the Invention

[0004] The main purpose of the present invention is to provide a steam temperature system control method and device, aiming to solve the technical problems of low accuracy and strong hysteresis in controlling the main steam temperature in the prior art.

[0005] To achieve the above object, the present invention provides a steam temperature system control method, the method comprising the following steps:

[0006] Establish a steam temperature control model for the main steam pipeline of a power plant;

[0007] Obtaining current steam property parameters of the main steam pipeline of the power plant;

[0008] Comparing the current steam property parameter with the historical steam property parameter to obtain a parameter change of the steam property parameter;

[0009] The parameter change is used to drive the superheating module or the temperature reduction module through the steam temperature control model to control the steam temperature.

[0010] Optionally, the steam temperature control model includes: a PID control module, a temperature control module and a fuzzy control module, the PID control module and the fuzzy control module are connected in parallel, and the temperature control module is connected to the PID control module and the fuzzy control module respectively, and the temperature control module includes at least a superheating module and a cooling module.

[0011] Optionally, the steam property parameters include at least: main steam pressure, main steam temperature and main steam flow rate, the main steam temperature includes: pre-pipe steam temperature and inert zone steam temperature, the pre-pipe steam temperature is the steam temperature measured at the inlet of the superheating module and close to the desuperheating module area, and the inert zone steam temperature is the steam temperature of the superheating module outlet area;

[0012] The step of using the parameter variation to drive a superheating module or a temperature reduction module through the steam temperature control model to control the steam temperature includes:

[0013] When the parameter change is greater than a preset change threshold, the fuzzy control module drives the superheating module or the temperature reduction module to control the steam temperature;

[0014] When the parameter change is less than or equal to a preset change threshold, the PID control module drives the superheating module or the temperature reduction module to control the steam temperature.

[0015] Optionally, the step of driving the superheating module or the temperature reduction module to control the steam temperature by the fuzzy control module includes:

[0016] Obtaining the desuperheating water flow rate of the desuperheating module, the pipe properties of the main steam pipe, and the gain coefficient of the main steam temperature for the desuperheating module;

[0017] Constructing a steam temperature control transfer function according to the desuperheating water flow rate, the pipeline properties and the gain coefficient;

[0018] The target operating state of the desuperheating module corresponding to the steam temperature in the leading zone and the target operating state of the superheating module corresponding to the steam temperature in the inert zone are calculated respectively through the steam temperature control transfer function.

[0019] Optionally, constructing a steam temperature control transfer function according to the desuperheating water flow rate, pipeline properties, and the gain coefficient includes:

[0020] querying the convection heat release coefficient of the main steam pipeline;

[0021] Calculating the average time for the desuperheated water to flow through the desuperheating module according to the pipeline properties and the desuperheated water flow rate;

[0022] Calculating dynamic heat exchange parameters based on the convection heat release coefficient, the pipe properties, the desuperheating water flow rate, and the constant pressure ratio at the outlet of the desuperheating module;

[0023] Calculate the heat storage time threshold of the main steam pipeline according to the pipeline properties and convection heat release coefficient;

[0024] Constructing a steam temperature control transfer function according to the gain coefficient, the average time duration of the cooling water flowing through the cooling module, the dynamic heat exchange parameter, and the heat storage time threshold;

[0025] Specifically, the steam temperature control transfer function is characterized as follows:

[0026]

[0027] Among them, k is the gain coefficient of the main steam temperature for the cooling module, τ is the average time for the cooling water to flow through the cooling module, a D is the dynamic heat exchange parameter, T m is the heat storage time threshold.

[0028] Optionally, the step of controlling the steam temperature by driving the superheating module or the temperature reduction module through the PID control module includes:

[0029] Acquire a first transfer function corresponding to the steam temperature measuring device of the leading zone and a second transfer function corresponding to the steam temperature measuring device of the inert zone;

[0030] Calculating a first control parameter corresponding to the steam temperature in the pilot zone by using the first transfer function;

[0031] Calculating a second control parameter corresponding to the steam temperature in the inert zone by using the second transfer function;

[0032] controlling the operating state of the temperature reduction module based on the first control parameter to achieve steam temperature control;

[0033] The operating state of the superheat module is controlled based on the second control parameter to achieve steam temperature control.

[0034] In addition, to achieve the above-mentioned purpose, the present invention further proposes a steam temperature system control device, the steam temperature system control device comprising:

[0035] Modeling module, used to establish the steam temperature control model of the main steam pipeline of the power plant;

[0036] An acquisition module, configured to acquire current steam property parameters of the main steam pipeline of the power plant;

[0037] A comparison module, configured to compare the current steam property parameter with the historical steam property parameter to obtain a parameter change of the steam property parameter;

[0038] The control module is used to drive the superheating module or the temperature reduction module to control the steam temperature through the steam temperature control model using the parameter change.

[0039] In addition, to achieve the above-mentioned purpose, the present invention also proposes a steam temperature system control device, which includes: a memory, a processor, and a steam temperature system control program stored on the memory and runnable on the processor, and the steam temperature system control program is configured to implement the steps of the steam temperature system control method described above.

[0040] In addition, to achieve the above objectives, the present invention also proposes a storage medium, on which a steam temperature system control program is stored. When the steam temperature system control program is executed by a processor, the steps of the steam temperature system control method described above are implemented.

[0041] In addition, to achieve the above-mentioned purpose, the present application also provides a computer program product, which includes a computer program. When the computer program is executed by a processor, it implements the steps of the steam temperature system control method as described above.

[0042] The present invention establishes a steam temperature control model for the main steam pipeline of a power plant; obtains current steam property parameters of the main steam pipeline of the power plant; compares the current steam property parameters with historical steam property parameters to obtain parameter changes of the steam property parameters; drives a superheating module or a cooling module to control the steam temperature through the steam temperature control model with the parameter changes, and uses the changing trend of the steam temperature as feedback to improve the accuracy and response speed of the steam temperature control, thereby avoiding the technical problems of low accuracy and strong hysteresis in controlling the main steam temperature in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0044] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0045] Figure 1 This is a flow chart of a first embodiment of a steam temperature system control method according to the present invention;

[0046] Figure 2 This is a flow chart of a second embodiment of a steam temperature system control method according to the present invention;

[0047] Figure 3 This is a structural block diagram of a first embodiment of a steam temperature system control device according to the present invention;

[0048] Figure 4 It is a structural diagram of a steam temperature system control device in a hardware operating environment involved in an embodiment of the present invention.

[0049] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0050] It should be understood that the specific embodiments described herein are merely used to explain the technical solutions of the present application and are not intended to limit the present application.

[0051] In order to better understand the technical solution of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.

[0052] Based on this, the embodiment of the present invention provides a steam temperature system control method, referring to Figure 1 , Figure 1 This is a flow chart of a first embodiment of a steam temperature system control method according to the present invention.

[0053] In this embodiment, the steam temperature system control method includes:

[0054] Step S10: Establishing a steam temperature control model for the main steam pipeline of the power plant.

[0055] Step S20: obtaining current steam property parameters of the main steam pipeline of the power plant.

[0056] Step S30: comparing the current steam attribute parameters with historical steam attribute parameters to obtain parameter changes of the steam attribute parameters.

[0057] Step S40: driving the superheating module or the temperature reduction module through the steam temperature control model using the parameter variation to perform steam temperature control.

[0058] It should be noted that the execution subject of this embodiment may be a computing service device with data processing, network communication, and program execution functions, such as a tablet computer, personal computer, mobile phone, etc., or an electronic device capable of implementing the above functions, a control computer, etc. The following describes this embodiment and the following embodiments using a control computer as an example.

[0059] In this embodiment, the steam temperature control model includes: a PID control module, a temperature control module and a fuzzy control module. The PID control module is connected in parallel with the fuzzy control module, and the temperature control module is connected to the PID control module and the fuzzy control module respectively. The temperature control module includes at least a superheating module and a cooling module.

[0060] Specifically, the PID control module includes a main regulation loop and a sub-regulation loop, wherein the sub-regulation loop includes a pilot steam temperature transmitter, a sub-regulator, an actuator and a cooling water valve, and the main regulation loop includes a main steam temperature transmitter, a main regulator and an inner loop.

[0061] The steam property parameters include at least: main steam pressure, main steam temperature and main steam flow rate. The main steam temperature includes: the steam temperature in the pilot zone and the steam temperature in the inert zone. The steam temperature in the pilot zone is the steam temperature measured at the inlet of the superheating module and close to the cooling module area. The steam temperature in the inert zone is the steam temperature in the outlet area of the superheating module.

[0062] In specific implementation, the pipe steam temperature in the pilot zone can more quickly reflect the impact of changes in the desuperheating water flow rate on the steam temperature. The temperature in the inert zone is the main steam temperature that ultimately needs to be controlled. It reflects the temperature state of the entire superheater. The operating parameters of the desuperheating module or superheating module are adjusted according to the deviation between the temperature in the inert zone and the set value, thereby achieving precise control of the main steam temperature.

[0063] It should be understood that the process flow of the main steam temperature controlled object is complex, and the main steam temperature characteristics of different units are completely different. When performing steam temperature control, it is necessary to choose whether to drive the superheating module or the cooling module according to different working conditions to achieve efficient steam temperature control.

[0064] This embodiment establishes a steam temperature control model for the main steam pipeline of a power plant; obtains current steam property parameters of the main steam pipeline of the power plant; compares the current steam property parameters with historical steam property parameters to obtain parameter changes of the steam property parameters; drives the superheating module or the cooling module to control the steam temperature through the steam temperature control model, and uses the changing trend of the steam temperature as feedback to improve the accuracy and response speed of the steam temperature control, thereby avoiding the technical problems of low accuracy and strong hysteresis in controlling the main steam temperature in the prior art.

[0065] Based on the first embodiment of the present application, in the second embodiment of the present application, the same or similar contents as those in the above embodiment 1 can be referred to the above introduction and will not be described in detail later. Figure 2 Step S40 includes:

[0066] Step S401: When the parameter change is greater than a preset change threshold, the fuzzy control module drives the superheating module or the temperature reduction module to perform steam temperature control.

[0067] Step S402: When the parameter variation is less than or equal to a preset variation threshold, the PID control module drives the superheating module or the temperature reduction module to control the steam temperature.

[0068] It should be noted that, in the steam temperature control model of the main steam pipeline of the power plant in this embodiment, control algorithms with different effects are selected according to different temperature change trends to improve the robustness of the steam temperature control model and its adaptability to different environments. Since the PID algorithm has a slow response speed and a strong lag in the temperature control process, but a good control effect, it can achieve a better temperature control effect when facing working conditions with small parameter changes; and the fuzzy control module in this embodiment has a fast response speed and a strong timeliness. When facing large steam temperature fluctuations, it can adjust the medium temperature of the main steam pipeline at a faster speed to prevent further deterioration.

[0069] In one embodiment, the step of driving the superheating module or the temperature reduction module to control the steam temperature by the fuzzy control module includes:

[0070] Obtaining the desuperheating water flow rate of the desuperheating module, the pipe properties of the main steam pipe, and the gain coefficient of the main steam temperature for the desuperheating module;

[0071] Constructing a steam temperature control transfer function according to the desuperheating water flow rate, the pipeline properties and the gain coefficient;

[0072] The target operating state of the desuperheating module corresponding to the steam temperature in the leading zone and the target operating state of the superheating module corresponding to the steam temperature in the inert zone are calculated respectively through the steam temperature control transfer function.

[0073] It can be understood that the pipeline properties of the main steam pipeline include at least parameters such as pipeline volume, pipeline mass specific heat coefficient, thermal conductivity, dynamic viscosity, etc.; the gain coefficient of the main steam temperature for the cooling module is determined by the steam enthalpy value of the water sprayed out of the cooling module, the enthalpy value of the cooling water, and the constant pressure specific heat of the medium at the outlet of the main steam flow pipeline.

[0074] In one embodiment, constructing a steam temperature control transfer function according to the desuperheating water flow rate, the pipeline properties, and the gain coefficient includes:

[0075] querying the convection heat release coefficient of the main steam pipeline;

[0076] Calculating the average time for the desuperheated water to flow through the desuperheating module according to the pipeline properties and the desuperheated water flow rate;

[0077] Calculating dynamic heat exchange parameters based on the convection heat release coefficient, the pipe properties, the desuperheating water flow rate, and the constant pressure ratio at the outlet of the desuperheating module;

[0078] Calculate the heat storage time threshold of the main steam pipeline according to the pipeline properties and convection heat release coefficient;

[0079] Constructing a steam temperature control transfer function according to the gain coefficient, the average time duration of the cooling water flowing through the cooling module, the dynamic heat exchange parameter, and the heat storage time threshold;

[0080] Specifically, the steam temperature control transfer function is characterized as follows:

[0081]

[0082] Among them, k is the gain coefficient of the main steam temperature for the cooling module, τ is the average time for the cooling water to flow through the cooling module, a D is the dynamic heat exchange parameter, T m is the heat storage time threshold.

[0083] In a specific implementation, the calculation formula for the average time that the cooling water flows through the cooling module is:

[0084]

[0085] Among them, V is the pipe volume, D is the main steam flow rate, that is, the steam temperature in the superheat module outlet area, It is the average density of the mixture of steam and desuperheated water in the pipe.

[0086] The calculation formula of dynamic heat exchange parameters is:

[0087]

[0088] Where α is the convection heat release coefficient, Cp is the constant pressure ratio at the outlet of the desuperheating module, and A is the inner wall surface area of the calculation area in the pipeline.

[0089] In one embodiment, the steam temperature control is performed by driving the superheating module or the temperature reduction module through the PID control module, including:

[0090] Acquire a first transfer function corresponding to the steam temperature measuring device of the leading zone and a second transfer function corresponding to the steam temperature measuring device of the inert zone;

[0091] Calculating a first control parameter corresponding to the steam temperature in the pilot zone by using the first transfer function;

[0092] Calculating a second control parameter corresponding to the steam temperature in the inert zone by using the second transfer function;

[0093] controlling the operating state of the temperature reduction module based on the first control parameter to achieve steam temperature control;

[0094] The operating state of the superheat module is controlled based on the second control parameter to achieve steam temperature control.

[0095] It should be understood that in the PID control process, since the pipe steam temperature in the pilot zone can more quickly reflect the impact of changes in the desuperheating water flow rate on the steam temperature, the temperature in the inert zone is the main steam temperature that ultimately needs to be controlled. It reflects the temperature state of the entire superheater. The operating parameters of the desuperheating module or the superheating module are adjusted according to the deviation between the temperature in the inert zone and the set value, thereby achieving precise control of the main steam temperature.

[0096] The auxiliary control loop consists of a pilot steam temperature transmitter, an auxiliary regulator, an actuator and a cooling water valve. The main control loop consists of a main steam temperature transmitter, a main regulator and an inner loop. The auxiliary control loop has a stronger timeliness and the main control loop has a better control effect. Therefore, when executing the steam temperature control process, the first control parameter corresponding to the steam temperature in the pilot zone can be used to control the operating state of the auxiliary control loop to achieve the purpose of rapid adjustment. The operating state of the main control loop can be adjusted by the second control parameter corresponding to the steam temperature in the inert zone to improve the effect of steam temperature control.

[0097] In this embodiment, when the parameter change is greater than a preset change threshold, the fuzzy control module drives the superheating module or the cooling module to control the steam temperature; when the parameter change is less than or equal to the preset change threshold, the PID control module drives the superheating module or the cooling module to control the steam temperature. Therefore, when faced with working conditions where the parameter change is small, steam temperature control through the PID control module can achieve a better air temperature control effect. When faced with large steam temperature fluctuations, steam temperature control through the fuzzy control module can adjust the medium temperature of the main steam pipeline at a faster speed to prevent further deterioration.

[0098] This application also provides a steam temperature system control device, please refer to Figure 3 , the steam temperature system control device includes:

[0099] The modeling module 10 is used to establish a steam temperature control model for the main steam pipeline of the power plant.

[0100] The acquisition module 20 is used to acquire the current steam property parameters of the main steam pipeline of the power plant.

[0101] The comparison module 30 is configured to compare the current steam property parameters with historical steam property parameters to obtain parameter changes of the steam property parameters.

[0102] The control module 40 is used to drive the superheating module or the temperature reduction module to control the steam temperature through the steam temperature control model using the parameter change.

[0103] This embodiment establishes a steam temperature control model for the main steam pipeline of a power plant; obtains current steam property parameters of the main steam pipeline of the power plant; compares the current steam property parameters with historical steam property parameters to obtain parameter changes of the steam property parameters; drives the superheating module or the cooling module to control the steam temperature through the steam temperature control model, and uses the changing trend of the steam temperature as feedback to improve the accuracy and response speed of the steam temperature control, thereby avoiding the technical problems of low accuracy and strong hysteresis in controlling the main steam temperature in the prior art.

[0104] In one embodiment, the modeling module 10 is also used for the steam temperature control model to include: a PID control module, a temperature control module and a fuzzy control module, the PID control module is connected in parallel with the fuzzy control module, and the temperature control module is connected to the PID control module and the fuzzy control module respectively, and the temperature control module includes at least a superheating module and a cooling module.

[0105] In one embodiment, the control module 40 is further used to drive the superheating module or the cooling module to control the steam temperature through the fuzzy control module when the parameter change is greater than a preset change threshold; and to drive the superheating module or the cooling module to control the steam temperature through the PID control module when the parameter change is less than or equal to the preset change threshold.

[0106] In one embodiment, the control module 40 is further used to obtain the cooling water flow of the cooling module, the pipeline properties of the main steam pipeline, and the gain coefficient of the main steam temperature for the cooling module; construct a steam temperature control transfer function based on the cooling water flow, pipeline properties and the gain coefficient; and calculate the target operating state of the cooling module corresponding to the steam temperature in the leading zone and the target operating state of the superheating module corresponding to the steam temperature in the inert zone through the steam temperature control transfer function.

[0107] In one embodiment, the control module 40 is further configured to query the convective heat release coefficient of the main steam pipeline; calculate the average time that the attemperating water flows through the attemperating module based on the pipeline properties and the attemperating water flow rate; calculate the dynamic heat exchange parameter based on the convective heat release coefficient, the pipeline properties, the attemperating water flow rate, and the constant pressure ratio at the outlet of the attemperating module; calculate the heat storage time threshold of the main steam pipeline based on the pipeline properties and the convective heat release coefficient; and construct a steam temperature control transfer function based on the gain coefficient, the average time that the attemperating water flows through the attemperating module, the dynamic heat exchange parameter, and the heat storage time threshold.

[0108] Specifically, the steam temperature control transfer function is characterized as follows:

[0109]

[0110] Among them, k is the gain coefficient of the main steam temperature for the cooling module, τ is the average time for the cooling water to flow through the cooling module, a D is the dynamic heat exchange parameter, T m is the heat storage time threshold.

[0111] In one embodiment, the control module 40 is further used to obtain a first transfer function corresponding to the steam temperature measuring device of the leading zone and a second transfer function corresponding to the steam temperature measuring device of the inert zone; calculate a first control parameter corresponding to the steam temperature of the leading zone through the first transfer function; calculate a second control parameter corresponding to the steam temperature of the inert zone through the second transfer function; control the operating state of the cooling module based on the first control parameter to achieve steam temperature control; and control the operating state of the superheating module based on the second control parameter to achieve steam temperature control.

[0112] The present application provides a steam temperature system control device, which includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the steam temperature system control method in the above-mentioned embodiment one.

[0113] Reference below Figure 4 , which shows a schematic structural diagram of a steam temperature system control device suitable for implementing an embodiment of the present application. The steam temperature system control device in the embodiment of the present application may include, but is not limited to, mobile terminals such as mobile phones, laptop computers, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Descriptions), PMPs (Portable Media Players), in-vehicle terminals (e.g., in-vehicle navigation terminals), and fixed terminals such as digital TVs and desktop computers. Figure 4 The steam temperature system control device shown is merely an example and should not limit the functions and scope of use of the embodiments of the present application.

[0114] like Figure 4As shown, the steam temperature system control device may include a processing device 1001 (e.g., a central processing unit, a graphics processing unit, etc.), which can perform various appropriate actions and processes based on programs stored in a read-only memory (ROM) 1002 or programs loaded from a storage device 1003 into a random access memory (RAM) 1004. RAM 1004 also stores various programs and data required for the operation of the steam temperature system control device. Processing device 1001, ROM 1002, and RAM 1004 are interconnected via a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Typically, the following systems may be connected to I / O interface 1006: input devices 1007, such as a touch screen, touchpad, keyboard, mouse, image sensor, microphone, accelerometer, gyroscope, etc.; output devices 1008, such as a liquid crystal display (LCD), speaker, vibrator, etc.; storage device 1003, such as a magnetic tape or hard disk; and communication device 1009. Communication device 1009 can allow the steam temperature system control device to communicate with other devices wirelessly or wired to exchange data. Although the figure shows a steam temperature system control device with various systems, it should be understood that it is not required to implement or include all of the systems shown. More or fewer systems may be implemented or included instead.

[0115] In particular, according to the embodiments disclosed in the present application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, the embodiments disclosed in the present application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program comprising program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network via a communication device, or installed from a storage device 1003, or installed from a ROM 1002. When the computer program is executed by the processing device 1001, the above-mentioned functions defined in the method of the embodiment disclosed in the present application are executed.

[0116] The steam temperature system control device provided in this application utilizes the steam temperature system control method of the aforementioned embodiment to resolve the technical issues surrounding steam temperature system control. Compared to the prior art, the steam temperature system control device provided in this application achieves the same beneficial effects as the steam temperature system control method of the aforementioned embodiment. Other technical features of the steam temperature system control device are the same as those disclosed in the aforementioned embodiment and are not further elaborated upon here.

[0117] It should be understood that the various parts disclosed in this application can be implemented using hardware, software, firmware, or a combination thereof. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0118] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

[0119] The present application provides a computer-readable storage medium having computer-readable program instructions (ie, a computer program) stored thereon, wherein the computer-readable program instructions are used to execute the steam temperature system control method in the above-mentioned embodiment.

[0120] The computer-readable storage medium provided in this application may be, for example, a USB flash drive, but is not limited to electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, systems or devices, or any combination thereof. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In this embodiment, the computer-readable storage medium may be any tangible medium that contains or stores a program that can be used by or in conjunction with an instruction execution system, system or device. The program code contained on the computer-readable storage medium may be transmitted using any appropriate medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination thereof.

[0121] The computer-readable storage medium may be included in the steam temperature system control device; or may exist independently without being assembled into the steam temperature system control device.

[0122] The computer-readable storage medium carries one or more programs. When the one or more programs are executed by the steam temperature system control device, the steam temperature system control device is enabled to: control the steam temperature system.

[0123] Computer program code for performing the operations of the present application may be written in one or more programming languages, or a combination thereof, including object-oriented programming languages such as Java, Smalltalk, C++, and conventional procedural programming languages such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a stand-alone software package, partially on the user's computer and partially on a remote computer, or entirely on the remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., through the Internet using an Internet service provider).

[0124] The flowcharts and block diagrams in the accompanying drawings illustrate the possible architecture, functions and operations of the systems, methods and computer program products according to various embodiments of the present application. In this regard, each box in the flowchart or block diagram can represent a module, program segment or a part of code, and the module, program segment or a part of code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order than that marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram or flowchart, and the combination of the boxes in the block diagram or flowchart, can be implemented by a dedicated hardware-based system that performs the specified function or operation, or can be implemented by a combination of dedicated hardware and computer instructions.

[0125] The modules described in the embodiments of the present application may be implemented in software or hardware, wherein the name of a module does not necessarily limit the unit itself.

[0126] The computer-readable storage medium provided in this application is a computer-readable storage medium storing computer-readable program instructions (i.e., a computer program) for executing the above-described steam temperature system control method, thereby resolving the technical issues related to steam temperature system control. Compared to the prior art, the beneficial effects of the computer-readable storage medium provided in this application are the same as those of the steam temperature system control method provided in the above-described embodiments, and are not further elaborated here.

[0127] The present application also provides a computer program product, comprising a computer program, which implements the steps of the steam temperature system control method as described above when the computer program is executed by a processor.

[0128] The computer program product provided in this application can solve the technical problem of steam temperature system control. Compared with the prior art, the beneficial effects of the computer program product provided in this application are the same as those of the steam temperature system control method provided in the above embodiment, which will not be repeated here.

[0129] The above description is only part of the embodiments of the present application and does not limit the patent scope of the present application. All equivalent structural transformations made by using the contents of the present application specification and drawings under the technical concept of the present application, or direct / indirect application in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A steam temperature system control method, characterized in that: The steam temperature system control method includes: Establish a steam temperature control model for the main steam pipeline of a power plant; Obtaining current steam property parameters of the main steam pipeline of the power plant; Comparing the current steam property parameter with the historical steam property parameter to obtain a parameter change of the steam property parameter; The parameter change is used to drive the superheating module or the temperature reduction module through the steam temperature control model to control the steam temperature.

2. The steam temperature system control method according to claim 1, characterized in that: The steam temperature control model includes: a PID control module, a temperature control module and a fuzzy control module. The PID control module is connected in parallel with the fuzzy control module, and the temperature control module is connected to the PID control module and the fuzzy control module respectively. The temperature control module includes at least a superheating module and a cooling module.

3. The steam temperature system control method according to claim 1, characterized in that: The steam attribute parameters include at least: main steam pressure, main steam temperature and main steam flow rate. The main steam temperature includes: pre-pipe steam temperature and inert zone steam temperature. The pre-pipe steam temperature is the steam temperature measured at the inlet of the superheating module and close to the desuperheating module area. The inert zone steam temperature is the steam temperature of the superheating module outlet area. The step of using the parameter variation to drive a superheating module or a temperature reduction module through the steam temperature control model to control the steam temperature includes: When the parameter change is greater than a preset change threshold, the fuzzy control module drives the superheating module or the temperature reduction module to control the steam temperature; When the parameter change is less than or equal to a preset change threshold, the PID control module drives the superheating module or the temperature reduction module to control the steam temperature.

4. The steam temperature system control method according to claim 3, characterized in that: The method of driving the superheating module or the temperature reduction module to control the steam temperature by the fuzzy control module includes: Obtaining the desuperheating water flow rate of the desuperheating module, the pipe properties of the main steam pipe, and the gain coefficient of the main steam temperature for the desuperheating module; Constructing a steam temperature control transfer function according to the desuperheating water flow rate, the pipeline properties and the gain coefficient; The target operating state of the desuperheating module corresponding to the steam temperature in the leading zone and the target operating state of the superheating module corresponding to the steam temperature in the inert zone are calculated respectively through the steam temperature control transfer function.

5. The steam temperature system control method according to claim 4, characterized in that: The constructing of the steam temperature control transfer function according to the desuperheating water flow rate, the pipeline properties and the gain coefficient includes: querying the convection heat release coefficient of the main steam pipeline; Calculating the average time for the desuperheated water to flow through the desuperheating module according to the pipeline properties and the desuperheated water flow rate; Calculating dynamic heat exchange parameters based on the convection heat release coefficient, the pipe properties, the desuperheating water flow rate, and the constant pressure ratio at the outlet of the desuperheating module; Calculate the heat storage time threshold of the main steam pipeline according to the pipeline properties and convection heat release coefficient; Constructing a steam temperature control transfer function according to the gain coefficient, the average time duration of the cooling water flowing through the cooling module, the dynamic heat exchange parameter, and the heat storage time threshold; Specifically, the steam temperature control transfer function is characterized as follows: Among them, k is the gain coefficient of the main steam temperature for the cooling module, τ is the average time for the cooling water to flow through the cooling module, a D is the dynamic heat exchange parameter, T m is the heat storage time threshold.

6. The steam temperature system control method according to claim 3, characterized in that: The method of controlling the steam temperature by driving the superheating module or the temperature reduction module through the PID control module includes: Acquire a first transfer function corresponding to the steam temperature measuring device of the leading zone and a second transfer function corresponding to the steam temperature measuring device of the inert zone; Calculating a first control parameter corresponding to the steam temperature in the pilot zone by using the first transfer function; Calculating a second control parameter corresponding to the steam temperature in the inert zone by using the second transfer function; controlling the operating state of the temperature reduction module based on the first control parameter to achieve steam temperature control; The operating state of the superheat module is controlled based on the second control parameter to achieve steam temperature control.

7. A steam temperature system control device, characterized in that: The steam temperature system control device includes: Modeling module, used to establish the steam temperature control model of the main steam pipeline of the power plant; An acquisition module, configured to acquire current steam property parameters of the main steam pipeline of the power plant; A comparison module, configured to compare the current steam property parameter with the historical steam property parameter to obtain a parameter change of the steam property parameter; The control module is used to drive the superheating module or the temperature reduction module to control the steam temperature through the steam temperature control model using the parameter change.

8. A steam temperature system control device, characterized in that: The steam temperature system control device includes: a memory, a processor, and a steam temperature system control program stored in the memory and executable on the processor, wherein the steam temperature system control program is configured to implement the steam temperature system control method according to any one of claims 1 to 6.

9. A storage medium, characterized in that: The storage medium stores a steam temperature system control program, which, when executed by a processor, implements the steam temperature system control method according to any one of claims 1 to 6.

10. A computer program product, characterized in that The computer program product includes a computer program, and when the computer program is executed by a processor, the steps of the steam temperature system control method according to any one of claims 1 to 6 are implemented.

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