Control method and device of coarse descaling system, equipment and medium

Abstract

The application discloses a control method and device of a rough descaling system, equipment and a medium, and belongs to the technical field of metallurgy. The method comprises the following steps: acquiring the rotating speed of the centrifugal pump; determining the rotating speed change state of the centrifugal pump according to the rotating speed, wherein the rotating speed change state comprises a speed reduction state, a speed increase state and a constant speed state; and if the rotating speed change state is the speed reduction state, controlling the minimum flow valve to be opened, so that the high-pressure water flow in the pump shell is discharged from the outlet of the second pipeline after passing through the minimum flow valve. The method can open the minimum flow valve when the centrifugal pump of the rough descaling system is in the speed reduction state, discharge the high-pressure water flow in the pump shell through the second pipeline, reduce the vibration caused by the backflow of the high-pressure water flow, reduce the fatigue damage of the rough descaling system, and improve the safety of the rough descaling system.

Description

Technical Field

[0001] This application relates to the field of metallurgical technology, and in particular to a control method, apparatus, equipment and medium for a coarse descaling system. Background Technology

[0002] In the hot rolling production process of the steel industry, the rough descaling system is a key process unit and an essential piece of equipment for the rolling line. The rough descaling system removes iron oxide scale from the surface of the slab using high-pressure water jets.

[0003] In existing technologies, the coarse descaling system adopts a drive and water supply mode of "variable frequency motor + centrifugal pump + high-pressure air-water tank". In this system, the variable frequency motor drives the centrifugal pump and adjusts its speed to control the pump's output flow rate. The centrifugal pump delivers water to the high-pressure air-water tank, which then sprays high-pressure water onto the slab surface.

[0004] However, during the deceleration process of a centrifugal pump, the inlet pipe often experiences severe vibration. Over long-term operation, this vibration causes cumulative fatigue damage to the pipe welds, flange connections, pipe clamp supports, and other structures, which can easily lead to weld cracking and loosening of connections, posing a serious safety hazard. Summary of the Invention

[0005] In view of the above problems, this application is made to provide a control method, device, equipment and medium for a coarse descaling system that solves the above problems. When the centrifugal pump of the coarse descaling system slows down, the minimum flow valve is opened to discharge the high-pressure water turbulence in the pump casing through a second pipeline, thereby reducing the vibration caused by the backflow of high-pressure water turbulence, reducing fatigue damage to the coarse descaling system and improving the safety of the coarse descaling system.

[0006] In a first aspect, this application provides a control method for a coarse descaling system. The coarse descaling system includes a variable frequency motor, a centrifugal pump, and a high-pressure air-water tank. The variable frequency motor and the centrifugal pump are connected via a coupling. The outlet of the centrifugal pump is connected to the inlet of a first pipeline and the inlet of a second pipeline, respectively. The high-pressure air-water tank is connected to the first pipeline via a branch line. The outlet of the first pipeline is connected to an injection valve. A minimum flow valve is connected in series in the second pipeline. The method includes: Obtain the rotational speed of the centrifugal pump; Based on the rotational speed, the rotational speed change state of the centrifugal pump is determined, including a deceleration state, a speed increase state, and a constant speed state. If the speed change state is the deceleration state, then the minimum flow valve is controlled to open so that the high-pressure water in the pump casing flows through the minimum flow valve and is discharged from the outlet of the second pipeline.

[0007] Optionally, obtaining the rotational speed of the centrifugal pump includes: Obtain the pressure of the high-pressure gas-water tank; If the pressure is greater than a preset high pressure threshold, the rotational speed of the centrifugal pump is obtained.

[0008] Optionally, controlling the opening of the minimum flow valve includes: The vibration acceleration of the detection point on the first pipeline is obtained. A check valve is connected in series on the first pipeline between the centrifugal pump and the high-pressure gas-water tank. The detection point is arranged on the first pipeline between the centrifugal pump and the check valve. Based on the vibration acceleration, determine the target opening degree of the minimum flow valve, and control the minimum flow valve to open to the target opening degree; The vibration acceleration is positively correlated with the target opening.

[0009] Optionally, determining the target opening degree of the minimum flow valve based on the vibration acceleration includes: Determine the rate of change of the vibration acceleration; The compensation opening of the minimum flow valve is determined based on the rate of change. The sum of the compensation opening and the preset base opening is taken as the target opening of the minimum flow valve.

[0010] The rate of change is positively correlated with the target opening degree.

[0011] Optionally, after controlling the minimum flow valve to open to the target opening degree, the method further includes: Determine the rate of decrease in the rotational speed of the centrifugal pump under the deceleration state; The opening of the minimum flow valve is adjusted according to the rate of decrease in rotational speed.

[0012] Optionally, the method further includes: Obtain the casing temperature of the centrifugal pump; If the housing temperature is greater than the preset high temperature threshold, then the minimum flow valve is controlled to open; If the housing temperature is less than a preset low temperature threshold, and the rotation speed change state is either an acceleration state or a constant speed state, then the minimum flow valve is controlled to close.

[0013] Optionally, a throttling device is provided between the outlet of the second pipeline and the minimum flow valve, the throttling device being used to reduce flow surges.

[0014] Secondly, this application provides a control device for a coarse descaling system. The coarse descaling system includes a variable frequency motor, a centrifugal pump, and a high-pressure air-water tank. The variable frequency motor and the centrifugal pump are connected via a coupling. The outlet of the centrifugal pump is connected to the inlet of a first pipeline and the inlet of a second pipeline, respectively. The high-pressure air-water tank is connected to the first pipeline via a branch line. The outlet of the first pipeline is connected to an injection valve. A minimum flow valve is connected in series in the second pipeline. The device includes: An acquisition module is used to acquire the rotational speed of the centrifugal pump; The determining module is used to determine the speed change state of the centrifugal pump based on the speed, the speed change state including a deceleration state, a speed increase state, and a constant speed state; The control module is used to control the minimum flow valve to open if the speed change state is the deceleration state, so that the high-pressure water in the pump casing flows through the minimum flow valve and is discharged from the outlet of the second pipeline.

[0015] Thirdly, this application provides an electronic device, including: a memory and a processor, the memory and the processor being communicatively connected to each other, the memory storing computer instructions, and the processor executing the computer instructions to perform the method as described in the first aspect.

[0016] Fourthly, this application provides a computer-readable storage medium storing computer instructions for causing the computer to perform the method described in the first aspect.

[0017] The technical solutions provided in this application embodiment have at least the following technical effects or advantages: This application provides a control method, device, equipment, and medium for a coarse descaling system. The method involves acquiring the rotational speed of a centrifugal pump; determining the speed change state of the centrifugal pump based on the rotational speed, i.e., judging whether the centrifugal pump is decelerating or accelerating; if the speed change state is decelerating, the method controls the minimum flow valve to open, allowing the high-pressure water in the pump casing to flow through the minimum flow valve and be discharged from the outlet of the second pipeline, thereby reducing the vibration caused by the backflow of high-pressure water, reducing fatigue damage to the coarse descaling system, and improving the safety of the coarse descaling system.

[0018] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0019] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 This is a structural diagram of a coarse descaling system provided in an embodiment of this application; Figure 2 This is a flowchart of a control method for a coarse descaling system provided in an embodiment of this application; Figure 3 This is a schematic diagram of a throttling device provided in an embodiment of this application; Figure 4 This is a structural block diagram of a control device for a coarse descaling system provided in an embodiment of this application. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings. It should be understood that the embodiments of this disclosure and the specific features in the embodiments are detailed descriptions of the technical solutions of this application, rather than limitations on the technical solutions of this application. Unless otherwise specified, the embodiments of this application and the technical features in the embodiments can be combined with each other.

[0021] Before providing a detailed description of the control method for a coarse descaling system provided in the embodiments of this application, a brief introduction to the coarse descaling system is given first.

[0022] Figure 1 This is a structural diagram of a coarse descaling system provided in an embodiment of this application, as shown below. Figure 1 As shown, the coarse descaling system includes a variable frequency motor 1, a coupling 2, a centrifugal pump 3, a check valve 4, a pump outlet pneumatic gate valve 5, a manual shut-off valve 6, a minimum liquid level valve 7, a high-pressure air-water tank 8, an injection valve 9, and a minimum flow valve 11. The variable frequency motor 1 and the centrifugal pump 3 are connected through the coupling 2. The outlet of the centrifugal pump 3 is connected to the inlet of the first pipeline and the inlet of the second pipeline, respectively. The high-pressure air-water tank 8 is connected to the first pipeline through a branch. The outlet of the first pipeline is connected to the injection valve 9. The minimum flow valve 11 is connected in series in the second pipeline. The check valve 4 is connected in series in the first pipeline between the centrifugal pump 3 and the high-pressure air-water tank 8. The manual shut-off valve 6 and the minimum liquid level valve 7 are connected in series in the branch. The pump outlet pneumatic gate valve 5 is connected in series in the first pipeline between the check valve 4 and the injection valve 9. The branch is connected to the first pipeline between the pump outlet pneumatic gate valve 5 and the injection valve 9.

[0023] Under normal operation of the coarse descaling system, the variable frequency motor 1 and centrifugal pump 3 start, and the outlet pneumatic gate valve 5, manual shut-off valve 6, and minimum liquid level valve 7 are open. When descaling of the steel plate is required, the control injection valve 9 is opened, putting the coarse descaling system into descaling mode. During the deceleration process of the centrifugal pump, the first pipeline often experiences severe vibration. This vibration originates from the backflow of some high-pressure water caused by the high-pressure gas-water tank during the closing of the check valve when the centrifugal pump speed decreases, which flows back into the pump casing and pipeline, creating hydraulic impact and resonance with the pipeline. Under long-term operation, the vibration causes cumulative fatigue damage to the pipeline welds, flange connections, pipe clamp supports, and other structures, easily leading to weld cracking and loosening of connections, posing a serious safety hazard. In addition, the vibration transmitted to auxiliary equipment such as the cooler of the variable frequency motor 1 can also cause its seal failure and frequent leakage, affecting the stable operation of the system.

[0024] To address the aforementioned problems, this application provides a control method, apparatus, equipment, and medium for a coarse descaling system. When the centrifugal pump in the coarse descaling system slows down, the minimum flow valve is opened to discharge the high-pressure water turbulence in the pump casing through a second pipeline, thereby reducing the vibration caused by the backflow of high-pressure water turbulence, reducing fatigue damage to the coarse descaling system, and improving the safety of the coarse descaling system.

[0025] Figure 2 This is a flowchart of a control method for a coarse descaling system provided in an embodiment of this application, as shown below. Figure 2 As shown, the method includes: Step S210: Obtain the speed of the centrifugal pump.

[0026] In this embodiment of the application, the rotational speed of the centrifugal pump is collected in real time by a sensor.

[0027] Step S220: Determine the speed change state of the centrifugal pump based on its speed.

[0028] The speed change states include deceleration, acceleration, and constant speed.

[0029] In this embodiment of the application, the speed of the centrifugal pump is determined based on whether the speed of the centrifugal pump decreases, increases, or remains unchanged.

[0030] Step S230: If the speed change state is a deceleration state, then control the minimum flow valve to open so that the high-pressure water in the pump casing flows through the minimum flow valve and is discharged from the outlet of the second pipeline.

[0031] In this embodiment, if the speed change is in a deceleration state, it indicates a high risk of pipeline vibration. Therefore, when the centrifugal pump begins to decelerate, or after a certain delay (e.g., ≤100ms), the PLC sends an opening command to the electromagnet of the minimum flow valve, energizing the electromagnet. After the minimum flow valve opens, the high-pressure water turbulence generated during the centrifugal pump deceleration process is discharged to the slag ditch through the second pipeline and the minimum flow valve, preventing backflow and impact on the pipeline, thus eliminating the vibration of the centrifugal pump and pipeline during the deceleration process. This critical timing design of opening the minimum flow valve within a very short delay after deceleration ensures that a discharge channel is established before turbulence forms, suppressing vibration in advance.

[0032] Next, if the speed change is in an increasing or constant speed state, it means that it will not cause pipeline vibration, indicating that the vibration risk of the coarse descaling system is low. The control PLC sends a closing command to the solenoid of the minimum flow valve, causing the solenoid of the minimum flow valve to be de-energized and the minimum flow valve to be closed.

[0033] like Figure 1 As shown, a throttling device 10 is provided between the outlet of the second pipeline and the minimum flow valve. The throttling device 10 is used to reduce flow impact.

[0034] In this method, water in the second pipeline is discharged to the slag ditch via a throttling device. The fixed orifice design of the throttling device limits the flow rate and stabilizes the flow pattern, preventing a sudden new flow surge in the second pipeline after the minimum flow valve is opened, thus avoiding secondary vibration. This method actively guides turbulent flow, fundamentally eliminating the main vibration source during the deceleration process, completely solving the vibration problem of the pump and inlet pipeline, reducing fatigue damage to pipelines and accessories, extending equipment service life, and lowering maintenance costs and safety risks.

[0035] Figure 3 This is a schematic diagram of a throttling device provided in an embodiment of this application, as shown below. Figure 3 As shown, the throttling device includes an inlet connector 31, multiple throttling plates 32 and an outlet connector 33 connected in sequence. The multiple throttling plates 32 are connected in series, and the medium (high-pressure water turbulence) is discharged after passing through the throttling device.

[0036] Optionally, step S210 includes: Step S2201: Obtain the pressure of the high-pressure gas-water tank; Step S2202: If the pressure is greater than the preset high pressure threshold, then obtain the speed of the centrifugal pump.

[0037] In this embodiment, the acceleration / deceleration of the centrifugal pump and the pressure of the high-pressure gas-water tank are controlled in an interlocking manner via a PLC (Programmable Logic Controller). When the pressure is higher than the high pressure threshold (e.g., 22 MPa), the centrifugal pump needs to slow down to reduce pressure, so a deceleration command is sent to the centrifugal pump; when the pressure is lower than the low pressure threshold (e.g., 20.5 MPa), the centrifugal pump needs to accelerate to increase pressure, so an acceleration command is sent to the centrifugal pump.

[0038] After receiving a speed-reduction command, the centrifugal pump will reduce its speed. However, whether the centrifugal pump actually reduces its speed depends on the real-time rotational speed, which has drawbacks. Because the pipeline of the coarse descaling system is prone to strong vibrations during the speed-reduction process, the vibration risk of the coarse descaling system can be determined by observing the centrifugal pump's rotational speed.

[0039] Optionally, step S230 includes: Step S2301: Obtain the vibration acceleration of the detection point on the first pipeline; Step S2302: Determine the target opening degree of the minimum flow valve based on the vibration acceleration, and control the minimum flow valve to open to the target opening degree.

[0040] A check valve is connected in series on the first pipeline between the centrifugal pump and the high-pressure gas-water tank, and the detection point is arranged on the first pipeline between the centrifugal pump and the check valve; the vibration acceleration is positively correlated with the target opening.

[0041] In this embodiment, the vibration acceleration on the pipeline next to the centrifugal pump is detected. If the vibration acceleration is greater than a preset acceleration threshold, it indicates that the pipeline is vibrating violently. If the vibration acceleration at the detection point is less than or equal to the acceleration threshold, it indicates that the pipeline is not vibrating or is vibrating very weakly. Therefore, the target opening is determined according to the actual vibration intensity of the pipeline. The stronger the vibration, the larger the target opening can be set, and the more high-pressure water turbulence can be eliminated in the second pipeline. Conversely, the smaller the vibration, the smaller the target opening can be.

[0042] Optionally, step S2302 includes: Based on the vibration acceleration, determine the compensation opening of the minimum flow valve; the sum of the compensation opening and the preset basic opening is taken as the target opening of the minimum flow valve.

[0043] Among them, the vibration acceleration is positively correlated with the compensation opening.

[0044] In this embodiment, the target opening can also be dynamically adjusted according to the vibration acceleration to achieve more precise flow control of the second pipeline, resulting in better vibration suppression.

[0045] Specifically, the base opening is fixed. The greater the vibration acceleration, the larger the compensation opening, the larger the target opening, and the greater the flow rate in the second pipeline, thus suppressing vibration to a greater extent. Conversely, the smaller the vibration acceleration, the smaller the compensation opening, the smaller the target opening, and the smaller the flow rate in the second pipeline, thus suppressing vibration to an appropriate degree.

[0046] The relationship between vibration acceleration and compensation opening can be pre-calibrated. When the minimum flow valve needs to be opened, the compensation opening corresponding to the vibration acceleration can be directly obtained from the relationship.

[0047] Optionally, after step S230, the method further includes: Determine the rate of speed reduction of the centrifugal pump under deceleration conditions; adjust the opening of the minimum flow valve according to the rate of speed reduction.

[0048] Among them, the rate of decrease in rotational speed is positively correlated with the target opening degree.

[0049] In this embodiment, the opening of the minimum flow valve can be dynamically adjusted according to the decrease in the centrifugal pump speed, so as to achieve more precise flow control of the second pipeline and improve the vibration suppression effect.

[0050] Specifically, the faster the centrifugal pump speed decreases, the larger the opening of the minimum flow valve is, resulting in a larger flow rate in the second pipeline and a greater degree of vibration suppression. Conversely, the slower the centrifugal pump speed decreases, the smaller the opening of the minimum flow valve is, resulting in a smaller flow rate in the second pipeline and a more appropriate degree of vibration suppression.

[0051] In this way, the correspondence between the speed drop rate and the opening adjustment amount can be calibrated in advance. When it is necessary to adjust the opening of the minimum flow valve, the opening adjustment amount corresponding to the speed drop rate can be directly obtained from the correspondence and adjusted accordingly.

[0052] Optionally, the method also includes: Obtain the casing temperature of the centrifugal pump; if the casing temperature is greater than the preset high temperature threshold, control the minimum flow valve to open; if the casing temperature is less than the preset low temperature threshold, and the speed change state is either an acceleration state or a constant speed state, control the minimum flow valve to close.

[0053] During the operation of the coarse descaling system, when the centrifugal pump casing temperature exceeds a set high temperature threshold (e.g., 45°C), the electromagnet controlling the minimum flow valve is energized, causing the minimum flow valve to open. Water in the pump casing is then discharged into the slag ditch through a throttling device, thus cooling the centrifugal pump. When the centrifugal pump casing temperature falls below a set low temperature threshold (e.g., 40°C), and the pump speed is either increasing or constant, the electromagnet controlling the minimum flow valve is de-energized, causing the minimum flow valve to close. This method simultaneously provides both overheat protection and vibration suppression, improving equipment utilization.

[0054] Among them, the minimum flow valve can be an electric regulating valve or a pneumatic diaphragm valve, which can achieve rapid opening and closing.

[0055] Based on the same concept, embodiments of the present invention also provide a control device for a coarse descaling system. Figure 4 This is a structural block diagram of a control device for a coarse descaling system provided in an embodiment of this application, as shown below. Figure 4 As shown, the device 400 includes an acquisition module 401, a determination module 402, and a first control module 403.

[0056] The acquisition module 401 is used to acquire the speed of the centrifugal pump; The determination module 402 is used to determine the speed change state of the centrifugal pump based on the speed. The speed change state includes deceleration state, speed increase state and constant speed state. The first control module 403 is used to control the minimum flow valve to open if the speed change state is a deceleration state, so that the high-pressure water in the pump casing flows through the minimum flow valve and the throttling device and is discharged from the outlet of the second pipeline.

[0057] Optionally, the acquisition module 401 is also used for: Obtain the pressure of the high-pressure gas-water tank; If the pressure is greater than the preset high pressure threshold, the speed of the centrifugal pump is obtained.

[0058] Optionally, the first control module 403 includes: The acquisition unit is used to acquire the vibration acceleration of the detection point on the first pipeline. A check valve is connected in series on the first pipeline between the centrifugal pump and the high-pressure gas-water tank. The detection point is arranged on the first pipeline between the centrifugal pump and the check valve. The determining unit is used to determine the target opening degree of the minimum flow valve based on the vibration acceleration, and to control the minimum flow valve to open to the target opening degree; Among them, the vibration acceleration is positively correlated with the target opening.

[0059] Optionally, the determining unit is also used for: Determine the compensation opening of the minimum flow valve based on the vibration acceleration; The sum of the compensation opening and the preset base opening is used as the target opening of the minimum flow valve.

[0060] Among them, the vibration acceleration is positively correlated with the compensation opening.

[0061] Optionally, the device 400 also includes an adjustment module for: Determine the rate of decrease in centrifugal pump speed under deceleration conditions; Adjust the opening of the minimum flow valve according to the rate of decrease in rotational speed.

[0062] Optionally, the device 400 also includes a second control module for: Obtain the casing temperature of the centrifugal pump; If the shell temperature exceeds the preset high temperature threshold, the minimum flow valve will be opened. If the housing temperature is lower than the preset low temperature threshold, and the rotation speed is either increasing or constant, then the minimum flow valve will be closed.

[0063] Optionally, a throttling device is provided between the outlet of the second pipeline and the minimum flow valve, the throttling device being used to reduce flow surges.

[0064] It is understood that the device provided in the above embodiments is only illustrated by the division of the above functional modules. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0065] This invention also provides an electronic device that may include a processor and a memory, wherein the processor and the memory may be interconnected via a bus or other means.

[0066] The processor can be a central processing unit (CPU), or an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of this application, or it can be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or other chips, or combinations of the above types of chips.

[0067] Memory may include mass storage for data or instructions. For example, and not limitingly, memory may include hard disk drives (HDDs), floppy disk drives, flash memory, optical disks, magneto-optical disks, magnetic tape, or Universal Serial Bus (USB) drives, or combinations of two or more of these. Where appropriate, memory may include removable or non-removable (or fixed) media. Where appropriate, memory may be internal or external to an electronic device. In a particular embodiment, memory may be non-volatile solid-state memory.

[0068] In one instance, the memory may be read-only memory (ROM). In one instance, the ROM may be a mask-programmed ROM, a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable PROM (EEPROM), an electrically rewritable ROM (EAROM), or flash memory, or a combination of two or more of these.

[0069] The processor reads and executes computer program instructions stored in memory to implement any of the control methods of the coarse descaling system in the above embodiments.

[0070] In one example, the electronic device may further include a communication interface and a bus. The processor, memory, and communication interface are connected via the bus to communicate with each other. The communication interface is primarily used to enable communication between the various modules, devices, units, and / or equipment in the embodiments of this application. Where appropriate, the bus may include one or more buses.

[0071] Furthermore, in conjunction with the control method of the coarse descaling system in the above embodiments, this invention can be implemented using a computer-readable storage medium. This computer-readable storage medium stores computer program instructions; when executed by a processor, these computer program instructions implement any of the control methods of the coarse descaling system in the above embodiments.

[0072] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, it can include the processes of the embodiments of the methods described above. The storage medium can be read-only memory (ROM), random access memory (RAM), flash memory, hard disk drive (HDD), or solid-state drive (SSD), etc.; the storage medium can also include combinations of the above types of memory.

[0073] The technical solutions described in the embodiments of this application have at least the following technical effects or advantages: This application provides a control method, device, equipment, and medium for a coarse descaling system. The method involves acquiring the rotational speed of a centrifugal pump; determining the speed change state of the centrifugal pump based on the rotational speed, i.e., judging whether the centrifugal pump is decelerating or accelerating; if the speed change state is decelerating, the method controls the minimum flow valve to open, allowing the high-pressure water in the pump casing to flow through the minimum flow valve and be discharged from the outlet of the second pipeline, thereby reducing the vibration caused by the backflow of high-pressure water, reducing fatigue damage to the coarse descaling system, and improving the safety of the coarse descaling system.

[0074] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0075] Similarly, it should be understood that, in order to simplify this disclosure and aid in understanding one or more of the various aspects of the invention, in the above description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof. However, this method of disclosure should not be construed as reflecting an intention that the claimed invention requires more features than are expressly recited in each claim. Rather, as reflected in the following claims, inventive aspects lie in fewer than all features of a single foregoing disclosed embodiment. Therefore, the claims following the detailed description are hereby expressly incorporated into this detailed description, wherein each claim itself is a separate embodiment of the invention.

[0076] It should be noted that the above embodiments are illustrative of the invention and not restrictive, and that those skilled in the art can devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses should not be construed as limiting the claims. The word "comprising" does not exclude the presence of components or steps not listed in the claims. The word "a" or "an" preceding a component does not exclude the presence of a plurality of such components. The invention can be implemented by means of hardware comprising several different components and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third, etc., does not indicate any order. These words can be interpreted as names.

Claims

1. A control method for a coarse descaling system, characterized in that, The coarse descaling system includes a variable frequency motor, a centrifugal pump, and a high-pressure air-water tank. The variable frequency motor and the centrifugal pump are connected via a coupling. The outlet of the centrifugal pump is connected to the inlet of a first pipeline and the inlet of a second pipeline. The high-pressure air-water tank is connected to the first pipeline via a branch line. The outlet of the first pipeline is connected to an injection valve. A minimum flow valve is connected in series in the second pipeline. The method includes: Obtain the rotational speed of the centrifugal pump; Based on the rotational speed, the rotational speed change state of the centrifugal pump is determined, including a deceleration state, a speed increase state, and a constant speed state. If the speed change state is the deceleration state, then the minimum flow valve is controlled to open so that the high-pressure water in the pump casing flows through the minimum flow valve and is discharged from the outlet of the second pipeline.

2. The control method for the coarse descaling system according to claim 1, characterized in that, The process of obtaining the rotational speed of the centrifugal pump includes: Obtain the pressure of the high-pressure gas-water tank; If the pressure is greater than a preset high pressure threshold, the rotational speed of the centrifugal pump is obtained.

3. The control method for the coarse descaling system according to claim 1, characterized in that, The control of opening the minimum flow valve includes: The vibration acceleration of the detection point on the first pipeline is obtained. A check valve is connected in series on the first pipeline between the centrifugal pump and the high-pressure gas-water tank. The detection point is arranged on the first pipeline between the centrifugal pump and the check valve. Based on the vibration acceleration, determine the target opening degree of the minimum flow valve, and control the minimum flow valve to open to the target opening degree; The vibration acceleration is positively correlated with the target opening.

4. The control method for the coarse descaling system according to claim 3, characterized in that, Determining the target opening of the minimum flow valve based on the vibration acceleration includes: The compensation opening of the minimum flow valve is determined based on the vibration acceleration. The sum of the compensation opening and the preset base opening is taken as the target opening of the minimum flow valve; The vibration acceleration is positively correlated with the compensation opening.

5. The control method for the coarse descaling system according to claim 1, characterized in that, After the minimum flow valve is opened, the method further includes: Determine the rate of decrease in the rotational speed of the centrifugal pump under the deceleration state; The opening of the minimum flow valve is adjusted according to the rate of decrease in rotational speed.

6. The control method for the coarse descaling system according to claim 1, characterized in that, The method further includes: Obtain the casing temperature of the centrifugal pump; If the housing temperature is greater than the preset high temperature threshold, then the minimum flow valve is controlled to open; If the housing temperature is less than a preset low temperature threshold, and the rotation speed change state is either the acceleration state or the constant speed state, then the minimum flow valve is controlled to close.

7. The control method for the coarse descaling system according to claim 1, characterized in that, A throttling device is provided between the outlet of the second pipeline and the minimum flow valve, the throttling device being used to reduce flow surges.

8. A control device for a coarse descaling system, characterized in that, The coarse descaling system includes a variable frequency motor, a centrifugal pump, and a high-pressure air-water tank. The variable frequency motor and the centrifugal pump are connected via a coupling. The outlet of the centrifugal pump is connected to the inlet of a first pipeline and the inlet of a second pipeline, respectively. The high-pressure air-water tank is connected to the first pipeline via a branch line. The outlet of the first pipeline is connected to an injection valve. A minimum flow valve is connected in series in the second pipeline. The device includes: An acquisition module is used to acquire the rotational speed of the centrifugal pump; The determining module is used to determine the speed change state of the centrifugal pump based on the speed, the speed change state including a deceleration state, a speed increase state, and a constant speed state; The control module is used to control the minimum flow valve to open if the speed change state is the deceleration state, so that the high-pressure water in the pump casing flows through the minimum flow valve and is discharged from the outlet of the second pipeline.

9. An electronic device, characterized in that, include: A memory and a processor, the memory and the processor being communicatively connected to each other, the memory storing computer instructions, the processor executing the computer instructions to perform the method of any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions for causing the computer to perform the method of any one of claims 1-7.

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