A steam pressure two-section control method, device and storage medium

Abstract

The embodiment of the present specification provides a steam pressure two-section control method, device and storage medium, the method comprises: determining a first pressure target value corresponding to a high-temperature steam adjusting valve and a second pressure target value corresponding to a heat source adjusting valve; according to the first pressure target value, the second pressure target value, a preset high-temperature steam adjusting valve opening degree change range and a preset heat source adjusting valve opening degree change range, based on a PID algorithm, the steam pressure is controlled. The technical scheme provided in the present application is used to solve the problem of unstable steam quantity and steam pressure in the prior art.

Description

Technical Field

[0001] This document relates to the industrial field of waste heat recovery, and in particular to a method, apparatus and storage medium for two-stage steam pressure control. Background Technology

[0002] The second type of absorption heat pump uses a medium-temperature heat source (waste hot water) as the driving heat source. Under the condition of using cooling water, it produces a high-temperature heat medium (high-temperature hot water or steam) that is higher than the medium-temperature heat source, so as to realize the transfer of heat energy from low temperature to high temperature.

[0003] The existing control method uses the high-temperature steam outlet pressure as the same target value and employs a PID algorithm to control the medium-temperature heat source regulating valve and the high-temperature steam outlet pressure regulating valve separately. Only when the transmission actions of the two actuators are consistent can a good control result be achieved.

[0004] However, in actual operation, the different media transmitted in the two valves, as well as the temperature changes of the cooling system and the medium-temperature heat source, can easily lead to unstable steam volume and steam pressure, affecting system operation and causing energy waste. Summary of the Invention

[0005] In view of the above analysis, this application aims to provide a steam pressure two-stage control method, apparatus and storage medium to solve at least one of the above-mentioned technical problems.

[0006] In a first aspect, one or more embodiments of this specification provide a two-stage steam pressure control method, including: Determine the first target pressure value corresponding to the high-temperature steam regulating valve and the second target pressure value corresponding to the heat source regulating valve; Based on the first pressure target value, the second pressure target value, the preset high-temperature steam regulating valve opening range, and the preset heat source regulating valve opening range, the steam pressure is controlled using a PID algorithm.

[0007] Further, determining the first target pressure value for the high-temperature steam regulating valve and the second target pressure value for the heat source regulating valve includes: Collect the cooling water inlet temperature of the medium-temperature heat source device; Collect the medium-temperature water inlet temperature of the medium-temperature heat source device; The target value correction value is determined based on the cooling water inlet temperature and the warm water inlet temperature; Determine the first target pressure value; The second pressure target value is obtained by calculating the sum of the first pressure target value and the target value correction value.

[0008] Further, determining the target value correction value based on the cooling water inlet temperature and the warm water inlet temperature includes: Calculate the first correction value based on the cooling water inlet temperature; Calculate the second correction value based on the inlet temperature of the warm water; The smaller of the first correction value and the second correction value is determined as the target value correction value.

[0009] Further, the step of controlling the steam pressure based on a PID algorithm according to the first pressure target value, the second pressure target value, the preset high-temperature steam regulating valve opening variation range, and the heat source regulating valve opening variation range includes: Based on the first pressure target value and the second pressure target value, the PID algorithm is activated; The opening degree of the high-temperature steam regulating valve is controlled based on the change value of the high-temperature steam regulating valve opening degree obtained by the PID algorithm and the change range of the high-temperature steam regulating valve opening degree. The opening degree of the heat source regulating valve is controlled based on the change value of the heat source regulating valve opening obtained by the PID algorithm and the change range of the heat source regulating valve opening.

[0010] Furthermore, the opening range of the high-temperature steam regulating valve includes: the minimum opening range and the maximum opening range; The step of controlling the opening of the high-temperature steam regulating valve based on the change value of the high-temperature steam regulating valve opening obtained from the PID algorithm and the range of the high-temperature steam regulating valve opening includes: When the change in the opening degree of the high-temperature steam regulating valve is less than the minimum change in opening degree, the opening degree of the high-temperature steam regulating valve remains unchanged. When the opening change value of the high-temperature steam regulating valve is within the range of the high-temperature steam regulating valve opening change value, the opening of the high-temperature steam regulating valve changes according to the opening change value of the high-temperature steam regulating valve. When the change in the opening degree of the high-temperature steam regulating valve is greater than the maximum change in opening degree, the opening degree of the high-temperature steam regulating valve changes according to the maximum change in opening degree.

[0011] Furthermore, the method also includes: The opening degree of the high-temperature steam regulating valve changes within a preset period.

[0012] Furthermore, the range of change in the opening degree of the heat source regulating valve includes: the minimum value of the opening degree change and the maximum value of the opening degree change; The step of controlling the opening of the heat source regulating valve based on the change value of the heat source regulating valve opening obtained from the PID algorithm and the range of the change in the heat source regulating valve opening includes: When the change in the opening degree of the heat source regulating valve is less than the minimum change in opening degree, the opening degree of the heat source regulating valve remains unchanged. When the change value of the opening of the heat source regulating valve is within the range of the change value of the opening of the heat source regulating valve, the opening of the heat source regulating valve changes according to the change value of the opening of the heat source regulating valve. When the change in the opening degree of the heat source regulating valve is greater than the maximum change in opening degree, the opening degree of the heat source regulating valve changes according to the maximum change in opening degree.

[0013] Furthermore, the method also includes: The opening degree of the heat source regulating valve changes within a preset period.

[0014] Secondly, embodiments of this application provide a steam pressure dual-stage control device, including: a determination module and a data processing module; The determining module is used to determine the first pressure target value of the high-temperature steam regulating valve and the second pressure target value of the heat source regulating valve; The data processing module is used to control the steam pressure based on a PID algorithm, according to the first pressure target value, the second pressure target value, the preset high-temperature steam regulating valve opening range, and the heat source regulating valve opening range.

[0015] This application provides a storage medium, including: Used to store computer-executable instructions, which, when executed, implement the method described in any one of the first aspects.

[0016] Compared with the prior art, this application can achieve at least the following technical effects: 1. Compared with the prior art, this application does not control the steam pressure based solely on the opening of the high-temperature steam regulating valve or the opening of the heat source regulating valve when executing the PID algorithm. Instead, it performs bidirectional control based on both the opening of the high-temperature steam regulating valve and the opening of the heat source regulating valve to avoid over-control due to the different operating environments of the two valves, thereby ensuring the stability of steam quantity and steam pressure.

[0017] 2. Based on the operating environment of the high-temperature steam regulating valve and the heat source regulating valve, the opening range of the high-temperature steam regulating valve and the opening range of the heat source regulating valve are preset, and the above-mentioned ranges are introduced into the PID control to ensure the dynamic balance between steam quantity and steam pressure.

[0018] 3. The calculation mode has been changed, but it is still based on the existing algorithm, which improves the applicability of the control method and reduces the improvement cost. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in one or more embodiments of this specification or in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this specification. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a flowchart illustrating a two-stage steam pressure control method provided for one or more embodiments of this specification. Detailed Implementation

[0021] To enable those skilled in the art to better understand the technical solutions in one or more embodiments of this specification, the technical solutions in one or more embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this specification, and not all of the embodiments. Based on one or more embodiments of this specification, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this document.

[0022] The basic rules for regulating the second type of absorption heat pump are as follows: 1. Opening the medium-temperature heat source regulating valve will increase the steam output and pressure, while closing it will reduce the steam output and pressure.

[0023] 2. Opening the steam outlet pressure regulating valve will reduce the steam pressure, while closing it will increase the steam pressure.

[0024] When existing technology controls steam outlet pressure based solely on the aforementioned rules, if the actual pressure falls below the target setpoint, the PID algorithm will cause both valves to adjust simultaneously: the medium-temperature heat source regulating valve will gradually open, while the steam outlet pressure regulating valve will gradually close. This increases the heat source input while simultaneously reducing the steam output. Because both control methods target the same value, it is easy for the steam pressure to exceed the setpoint, meaning the actual pressure will exceed the setpoint.

[0025] Once the actual pressure exceeds the set value, according to the PID algorithm, both valves will simultaneously begin to adjust again. The medium-temperature heat source regulating valve gradually closes, while the steam outlet pressure regulating valve gradually opens, thus reducing the heat source input while increasing the steam outlet output. Since both controls target the same value, it's easy for the steam pressure to fall below the set value, meaning the actual pressure will be lower than the set value.

[0026] Therefore, it can be seen that the existing control logic causes the actual value of the steam pressure to oscillate around the target value, and the oscillation is sinusoidal, resulting in unstable steam quantity and steam pressure.

[0027] To address the aforementioned technical problems, this application provides a two-stage steam pressure control method, comprising the following steps: Step 1: Determine the first target pressure value corresponding to the high-temperature steam regulating valve and the second target pressure value corresponding to the heat source regulating valve.

[0028] In this embodiment, the high-temperature steam outlet pressure is added as the controlled object, meaning two target values ​​are used for control. The first pressure target value is the high-temperature steam outlet pressure, and the second pressure target value is the pressure generated by the medium-temperature heat source device. Theoretically, the first and second pressure target values ​​are equal during control. However, in actual operation, considering the different transmission media and system heat loss, the second pressure target value should be greater than the first pressure target value. The difference between the second and first pressure target values ​​is recorded as a correction value in this application. The mechanical characteristics of the medium-temperature heat source device affect the steam quantity and steam pressure, thus affecting the correction value. Therefore, determining the correction value requires considering the mechanical characteristics of the medium-temperature heat source to achieve accurate determination of the second pressure target value.

[0029] Specifically, the cooling water inlet temperature and the medium-temperature water inlet temperature of the medium-temperature heat source device are collected. Based on the cooling water inlet temperature and the medium-temperature water inlet temperature, a target value correction value is determined. A first pressure target value is determined; the sum of the first pressure target value and the target value correction value is calculated to obtain a second pressure target value.

[0030] The process of determining the correction value is as follows: Calculate the first correction value based on the cooling water inlet temperature. Calculate the second correction value based on the warm water inlet temperature. Determine the smaller of the first and second correction values ​​as the target correction value.

[0031] In this embodiment, the mechanical characteristics of the medium-temperature heat source device are reflected in the inlet temperature of the warm water and the inlet temperature of the cooling water. The cooling water inlet temperature is positively correlated with the correction value, while the warm water inlet temperature is negatively correlated with the correction value. During control, the control accuracy is satisfied as long as the correction value meets either the first or the second correction value. To reduce energy consumption, this application selects the smaller of the first and second correction values ​​as the target correction value.

[0032] Step 2: Based on the first pressure target value, the second pressure target value, the preset high-temperature steam regulating valve opening range, and the preset heat source regulating valve opening range, control the steam pressure using a PID algorithm.

[0033] In this embodiment, a PID algorithm is used to control the high-temperature steam regulating valve and the heat source regulating valve, with the high-temperature steam outlet pressure and the pressure generated by the medium-temperature heat source device as target values, thereby controlling the steam pressure. As mentioned earlier, the reason for the oscillation of the actual steam value is that the heat source input and steam outlet flow are difficult to control. Therefore, the opening range of the high-temperature steam regulating valve and the heat source regulating valve are set to allow the heat source input and steam outlet flow to vary within a certain range, so as to achieve stability of steam quantity and steam pressure.

[0034] Specifically, firstly, based on the first and second pressure target values, a PID algorithm is initiated. Running the PID algorithm yields the changes in the opening degree of the high-temperature steam regulating valve and the heat source regulating valve. Then, based on the changes in the opening degree of the high-temperature steam regulating valve and their range obtained from the PID algorithm, the opening degree of the high-temperature steam regulating valve is controlled. Similarly, based on the changes in the opening degree of the heat source regulating valve and their range obtained from the PID algorithm, the opening degree of the heat source regulating valve is controlled.

[0035] The specific control process of the high-temperature steam valve is as follows: When the change in the opening degree of the high-temperature steam regulating valve is less than the minimum change in opening degree, the opening degree of the high-temperature steam regulating valve remains unchanged. When the change in the opening degree of the high-temperature steam regulating valve is within the range of change in the opening degree of the high-temperature steam regulating valve, the opening degree of the high-temperature steam regulating valve changes according to the change in the opening degree of the high-temperature steam regulating valve. When the change in the opening degree of the high-temperature steam regulating valve is greater than the maximum change in opening degree, the opening degree of the high-temperature steam regulating valve changes according to the maximum change in opening degree.

[0036] It should be noted that although this application sets a maximum value for the opening change, the high-temperature steam outlet temperature can still be adjusted by increasing the duration of the corresponding opening.

[0037] Furthermore, a pre-set steam pressure difference is established. When the difference between the actual pressure and the first target pressure value is less than this steam pressure difference, the high-temperature steam regulating valve is opened. If no steam pressure difference is set, when the high-temperature steam regulating valve opens, external high-pressure steam enters the unit's flash tank, causing a rapid pressure rise. This affects the PID calculation value and results in the steam outlet pressure regulating valve opening too large. Subsequently, the low pressure inside the unit's flash tank causes fluctuations in steam pressure and steam volume.

[0038] The specific control process of the heat source regulating valve is as follows: When the change in the opening of the heat source regulating valve is less than the minimum change in opening, the opening of the heat source regulating valve remains unchanged. When the change in the opening degree of the heat source regulating valve is within the range of the change in the opening degree of the heat source regulating valve, the opening degree of the heat source regulating valve changes according to the change in the opening degree of the heat source regulating valve. When the change in the opening of the heat source regulating valve is greater than the maximum change in opening, the opening of the heat source regulating valve changes according to the maximum change in opening.

[0039] Furthermore, during the preheating stage, which is the stage before the PID algorithm runs, the upper limit of the opening of the medium-temperature heat source regulating valve is preset to avoid wasting energy and excessive pressure in the flash tank.

[0040] Since the proposed solution can stabilize the steam pressure and steam volume, the period for the change of the opening of the high-temperature steam regulating valve and the period for the change of the opening of the heat source regulating valve can be preset so that the opening of the high-temperature steam regulating valve and the opening of the heat source regulating valve can change within the preset period.

[0041] For the heat source regulating valve, to enhance its coordination with the high-temperature steam regulating valve, the opening degree is varied according to the first cycle when the difference between the actual pressure and the first pressure target value is less than the steam pressure difference. When the difference between the actual pressure and the first pressure target value is not less than the steam pressure difference, the opening degree is varied according to the second cycle. That is, during the preheating period, to prevent excessive temperature changes in the unit's flash tank, the heat source regulating valve varies its opening degree according to the second cycle. During heating, the opening degree is varied according to the first cycle.

[0042] This application provides a two-stage steam pressure control device, including: a determination module and a data processing module; The determining module is used to determine the first pressure target value of the high-temperature steam regulating valve and the second pressure target value of the heat source regulating valve; The data processing module is used to control the steam pressure based on a PID algorithm, according to the first pressure target value, the second pressure target value, the preset high-temperature steam regulating valve opening range, and the heat source regulating valve opening range.

[0043] This application provides a storage medium, including: Used to store computer-executable instructions, which, when executed, implement the following process: The foregoing has described specific embodiments of this specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims may be performed in a different order than that shown in the embodiments and may still achieve the desired result. Furthermore, the processes depicted in the drawings do not necessarily require the specific or sequential order shown to achieve the desired result. In some embodiments, multitasking and parallel processing are possible or may be advantageous.

[0044] In the 1930s, improvements to a technology could be clearly distinguished as either hardware improvements (e.g., improvements to the circuit structure of diodes, transistors, switches, etc.) or software improvements (improvements to the methodology). However, with technological advancements, many improvements to the methodology today can be considered direct improvements to the hardware circuit structure. Designers almost always obtain the corresponding hardware circuit structure by programming the improved methodology into the hardware circuit. Therefore, it cannot be said that an improvement to the methodology cannot be implemented using hardware physical modules. For example, a Programmable Logic Device (PLD) (such as a Field Programmable Gate Array (FPGA)) is such an integrated circuit whose logic function is determined by the user programming the device. Designers can program and "integrate" a digital system onto a PLD themselves, without needing chip manufacturers to design and manufacture dedicated integrated circuit chips. Furthermore, nowadays, instead of manually manufacturing integrated circuit chips, this programming is mostly implemented using "logic compiler" software. Similar to the software compiler used in program development, the original code before compilation must also be written in a specific programming language, called a Hardware Description Language (HDL). There are many HDLs, such as ABEL (Advanced Boolean Expression Language), AHDL (Altera Hardware Description Language), Confluence, CUPL (Cornell University Programming Language), HDCal, JHDL (Java Hardware Description Language), Lava, Lola, MyHDL, PALASM, and RHDL (Ruby Hardware Description Language). Currently, the most commonly used are VHDL (Very-High-Speed ​​Integrated Circuit Hardware Description Language) and Verilog. Those skilled in the art should also understand that by simply performing some logic programming on the method flow using one of these hardware description languages ​​and programming it into an integrated circuit, the hardware circuit implementing the logical method flow can be easily obtained.

[0045] The controller can be implemented in any suitable manner. For example, it can take the form of a microprocessor or processor and a computer-readable medium storing computer-readable program code (e.g., software or firmware) executable by the (micro)processor, logic gates, switches, application-specific integrated circuits (ASICs), programmable logic controllers, and embedded microcontrollers. Examples of controllers include, but are not limited to, the following microcontrollers: ARC 625D, Atmel AT91SAM, Microchip PIC18F26K20, and Silicon Labs C8051F320. A memory controller can also be implemented as part of the control logic of the memory. Those skilled in the art will also recognize that, in addition to implementing the controller in purely computer-readable program code form, the same functionality can be achieved by logically programming the method steps to make the controller take the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers, and embedded microcontrollers. Therefore, such a controller can be considered a hardware component, and the means included therein for implementing various functions can also be considered as structures within the hardware component. Alternatively, the means for implementing various functions can be considered as both software modules implementing the method and structures within the hardware component.

[0046] The systems, devices, modules, or units described in the above embodiments can be implemented by computer chips or entities, or by products with certain functions. A typical implementation device is a computer. Specifically, a computer can be, for example, a personal computer, laptop computer, cellular phone, camera phone, smartphone, personal digital assistant, media player, navigation device, email device, game console, tablet computer, wearable device, or any combination of these devices.

[0047] For ease of description, the above apparatus is described by dividing it into various functional units. Of course, when implementing the embodiments of this specification, the functions of each unit can be implemented in one or more software and / or hardware.

[0048] Those skilled in the art will understand that one or more embodiments of this specification can be provided as a method, system, or computer program product. Therefore, one or more embodiments of this specification may take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this specification may 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.

[0049] This specification is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this specification. 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 illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0050] 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.

[0051] 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.

[0052] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0053] Memory may include non-persistent storage 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.

[0054] 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.

[0055] 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 a process, method, article, or apparatus. Without further limitation, 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 said element.

[0056] One or more embodiments of this specification can be described in the general context of computer-executable instructions, such as program modules, that are executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc., that perform a particular task or implement a particular abstract data type. One or more embodiments of this specification can also be practiced in distributed computing environments where tasks are performed by remote processing devices connected via a communication network. In distributed computing environments, program modules can reside in local and remote computer storage media, including storage devices.

[0057] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0058] The above description is merely an embodiment of this document and is not intended to limit the scope of this document. Various modifications and variations can be made to this document by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this document should be included within the scope of the claims of this document.

Claims

1. A two-stage steam pressure control method, characterized in that, The method is used for a second type of absorption heat pump, including: Determine the first target pressure value corresponding to the high-temperature steam regulating valve and the second target pressure value corresponding to the heat source regulating valve; Based on the first pressure target value, the second pressure target value, the preset high-temperature steam regulating valve opening variation range, and the preset heat source regulating valve opening variation range, the steam pressure is controlled using a PID algorithm. The first pressure target value is the high-temperature steam outlet pressure, and the second pressure target value is the pressure generated by the medium-temperature heat source device. Determining the first target pressure value for the high-temperature steam regulating valve and the second target pressure value for the heat source regulating valve includes: Collect the cooling water inlet temperature of the medium-temperature heat source device; Collect the medium-temperature water inlet temperature of the medium-temperature heat source device; The target value correction value is determined based on the cooling water inlet temperature and the warm water inlet temperature; Determine the first target pressure value; The second pressure target value is obtained by calculating the sum of the first pressure target value and the target value correction value.

2. The method according to claim 1, characterized in that, The step of determining the target value correction value based on the cooling water inlet temperature and the warm water inlet temperature includes: Calculate the first correction value based on the cooling water inlet temperature; Calculate the second correction value based on the inlet temperature of the warm water; The smaller of the first correction value and the second correction value is determined as the target value correction value.

3. The method according to claim 1, characterized in that, The step of controlling the steam pressure based on a PID algorithm, according to the first pressure target value, the second pressure target value, a preset range for the opening variation of the high-temperature steam regulating valve, and a preset range for the opening variation of the heat source regulating valve, includes: Based on the first pressure target value and the second pressure target value, the PID algorithm is activated; The opening degree of the high-temperature steam regulating valve is controlled based on the change value of the high-temperature steam regulating valve opening degree obtained by the PID algorithm and the change range of the high-temperature steam regulating valve opening degree. The opening degree of the heat source regulating valve is controlled based on the change value of the heat source regulating valve opening obtained by the PID algorithm and the change range of the heat source regulating valve opening.

4. The method according to claim 3, characterized in that, The opening range of the high-temperature steam regulating valve includes: the minimum opening range and the maximum opening range; The step of controlling the opening of the high-temperature steam regulating valve based on the change value of the high-temperature steam regulating valve opening obtained from the PID algorithm and the range of the high-temperature steam regulating valve opening includes: When the change in the opening degree of the high-temperature steam regulating valve is less than the minimum change in opening degree, the opening degree of the high-temperature steam regulating valve remains unchanged. When the opening change value of the high-temperature steam regulating valve is within the range of the high-temperature steam regulating valve opening change value, the opening of the high-temperature steam regulating valve changes according to the opening change value of the high-temperature steam regulating valve. When the change in the opening degree of the high-temperature steam regulating valve is greater than the maximum change in opening degree, the opening degree of the high-temperature steam regulating valve changes according to the maximum change in opening degree.

5. The method according to claim 4, characterized in that, The method further includes: The opening degree of the high-temperature steam regulating valve changes within a preset period.

6. The method according to claim 3, characterized in that, The range of change in the opening degree of the heat source regulating valve includes: the minimum value of the opening degree change and the maximum value of the opening degree change; The step of controlling the opening of the heat source regulating valve based on the change value of the heat source regulating valve opening obtained from the PID algorithm and the range of the change in the heat source regulating valve opening includes: When the change in the opening degree of the heat source regulating valve is less than the minimum change in opening degree, the opening degree of the heat source regulating valve remains unchanged. When the change value of the opening of the heat source regulating valve is within the range of the change value of the opening of the heat source regulating valve, the opening of the heat source regulating valve changes according to the change value of the opening of the heat source regulating valve. When the change in the opening degree of the heat source regulating valve is greater than the maximum change in opening degree, the opening degree of the heat source regulating valve changes according to the maximum change in opening degree.

7. The method according to claim 6, characterized in that, The method further includes: The opening degree of the heat source regulating valve changes within a preset period.

8. A steam pressure dual-stage control device, characterized in that, The device is used for a second type of absorption heat pump and includes: a determination module and a data processing module; The determining module is used to determine the first pressure target value corresponding to the high-temperature steam regulating valve and the second pressure target value corresponding to the heat source regulating valve; The data processing module is used to control the steam pressure based on a PID algorithm, according to the first pressure target value, the second pressure target value, the preset high-temperature steam regulating valve opening range, and the heat source regulating valve opening range. The first pressure target value is the high-temperature steam outlet pressure, and the second pressure target value is the pressure generated by the medium-temperature heat source device. Determining the first target pressure value for the high-temperature steam regulating valve and the second target pressure value for the heat source regulating valve includes: Collect the cooling water inlet temperature of the medium-temperature heat source device; Collect the medium-temperature water inlet temperature of the medium-temperature heat source device; The target value correction value is determined based on the cooling water inlet temperature and the warm water inlet temperature; Determine the first target pressure value; The second pressure target value is obtained by calculating the sum of the first pressure target value and the target value correction value.

9. A storage medium, characterized in that, include: Used to store computer-executable instructions, which, when executed, implement the method of any one of claims 1-7.

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