A method and device for preventing high-pressure water descaling accumulator from running out of pressure

Abstract

The present application relates to high pressure water descaling system equipment technical field, especially to a kind of method and device for the collaborative control of preventing high pressure water descaling potential device wind loss pressure, compare the liquid level feedback value of two potential device liquid level meters, when liquid level meter fails, the control right of fault liquid level meter is switched to another liquid level meter;Potential device pressure protection is set, when the water tank pressure of potential device is lower than set value, the lowest liquid level valve is closed;According to descaling instruction and the water tank pressure state of potential device, the speed of descaling pump group is controlled and the speed is reduced.The present application has the advantages that: from the liquid level protection, pressure protection, pre-protection control three levels, the collaborative protection system for preventing high pressure water descaling potential device wind loss pressure is constructed, liquid level protection is as main protection, solves the protection failure problem caused by liquid level meter jam, detection distortion;Pressure protection is as auxiliary protection, makes up the defect that magnetic float liquid level meter follows poorly;Pre-protection control is adjusted intelligently by pump group speed.

Description

Technical Field

[0001] This invention relates to the field of high-pressure water descaling system equipment technology, and in particular to a collaborative control method and device for preventing air leakage and pressure loss in high-pressure water descaling accumulators. Background Technology

[0002] The high-pressure water descaling system is a key piece of equipment on the hot rolling production line, used to remove iron oxide scale from the surface of steel billets and ensure the surface quality of strip steel. The accumulator is an important component of the system, serving two main purposes: first, it stores high-pressure water to replenish water supply during multi-point descaling; second, it helps reduce water pressure pulsations during descaling, ensuring stable system pressure and minimizing impact on pipes, valves, and other equipment.

[0003] A typical hot-rolling high-pressure water descaling system is equipped with two accumulator tanks, each fitted with a magnetic float level gauge to reflect the actual liquid level within the accumulator. The system utilizes a level protection interlock to protect the accumulator level: when the accumulator level reaches the low level, the minimum level valve is shut off; when the level falls below the ultra-low level, the accumulator pneumatic gate valve is shut off, thus preventing air leakage and pressure loss in the accumulator.

[0004] In actual production, due to water quality issues and equipment malfunctions, it is common for level gauges to jam or malfunction. Once the level gauge malfunctions, the level protection interlock function fails, which not only reduces the descaling pressure and affects the descaling quality, but more seriously, it may cause the accumulator to leak air and lose pressure, leading to a major equipment accident.

[0005] Furthermore, during the rolling process, the magnetic float level gauge suffers from poor tracking performance: when the water consumption for multi-point descaling is large, the water level in the accumulator drops rapidly with the increase in water consumption. If the level gauge fails to reflect the level change in a timely and accurate manner, it may cause the accumulator to lose pressure. At the same time, due to poor water quality and a large amount of impurities in the pipeline, the detection signal of the magnetic float level gauge is prone to distortion with the actual liquid level, leading to a series of problems such as pump vibration, insufficient pressure during multi-point descaling, and air leakage and pressure loss in the accumulator.

[0006] Therefore, how to effectively prevent accumulator leakage and pressure loss accidents caused by level gauge failure or detection distortion, and improve the operational reliability and safety of the descaling system, is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0007] The purpose of this invention is to provide a collaborative control method and device for preventing air leakage and pressure loss in high-pressure water descaling accumulators. By setting up automatic early warning of liquid level deviation, one-button switching of liquid level control, accumulator pressure protection, and liquid level and pressure pre-protection, a multi-level collaborative protection system is constructed. This solves the protection failure problem caused by liquid level gauge jamming, detection distortion, and poor tracking performance, ensuring the continuous effectiveness of the accumulator liquid level protection function, preventing air leakage and pressure loss accidents, and improving the operational reliability and safety of the descaling system.

[0008] To achieve the above objectives, the present invention provides the following technical solution: A collaborative control method for preventing air leakage and pressure loss in a high-pressure water descaling accumulator includes: Compare the level feedback values ​​of the two accumulator level gauges, and issue an early warning message when the level deviation exceeds the set threshold; When a level gauge malfunctions, control of the malfunctioning level gauge can be switched to another level gauge with a single click via the human-machine interface. Set the accumulator pressure protection. When the pressure in the accumulator tank is lower than the set value one, close the minimum liquid level valve. The set value one ranges from 10 to 13 MPa. Based on the descaling command and the water tank pressure status of the accumulator, the speed of the descaling pump set is controlled to increase and decrease, and pre-protection of liquid level and pressure is implemented.

[0009] The set threshold for liquid level deviation is 200~400mm. When the absolute value of the liquid level deviation between the two accumulator liquid level gauges is greater than the set threshold for liquid level deviation, an early warning message is generated on the HMI.

[0010] One-click switching: A switching button is set on the HMI screen. When the operator clicks the switching button, it triggers the PLC program, enabling redundant switching of the liquid level interlock control signal. This ensures that the accumulator's liquid level protection remains effective even if the liquid level gauge fails. Specifically, this includes: (1) Read the liquid level signal status of the faulty level gauge corresponding to the faulty accumulator; (2) Remove the level signal of the faulty level gauge from the level interlock control program of the corresponding accumulator; (3) At the same time, the liquid level signal of another normal liquid level gauge is connected to the liquid level interlock control program of the accumulator; (4) Update the HMI screen display and display the number of the level gauge currently involved in the level interlock control.

[0011] Pressure protection is implemented by adding a pressure interlock while maintaining the original low liquid level of the corresponding accumulator and closing the minimum liquid level valve. When the pressure in the water tank of the corresponding accumulator is lower than the set pressure value, the minimum liquid level valve is closed.

[0012] Pre-protection for liquid level and pressure includes: (1) When a descaling command is received in the roughing zone or the water tank pressure of the accumulator is lower than the set pressure value 2, the minimum flow valve is closed and the descaling pump group is accelerated to the high speed state. The value range of the set value 2 is 15-18MPa. (2) After the descaling operation is completed: If the pressure in the accumulator's water tank is lower than the set pressure value three, the pump unit will maintain high speed until the pressure in the accumulator's water tank reaches the set pressure value three and maintain it for 75 seconds before reducing the speed. The set pressure value three ranges from 20 to 22 MPa. If the pressure in the accumulator's water tank is greater than the set pressure value, it needs to be maintained for 75 seconds before reducing the speed to a low speed. This is to avoid the pump set frequently increasing or decreasing speed due to the short interval between the next descaling operations. in: The set pressure value two is less than the set pressure value three.

[0013] A coordinated control device to prevent air leakage and pressure loss in the high-pressure water descaling accumulator includes a minimum flow valve, a minimum liquid level valve, a pressure sensor, a liquid level gauge, and a descaling pump set. The outlet of the accumulator is equipped with a pressure sensor to detect the water tank pressure of the accumulator; Each accumulator tank is equipped with a level gauge to detect the accumulator level; The descaling pump set is installed on the pipeline between the water source and the accumulator. The accumulator is used to store high-pressure water and supplement the water supply during multi-point descaling. The minimum flow valve is located on the pipeline at the outlet of the descaling pump set and is used to maintain the pump set at the minimum flow rate when it is not in the descaling state. The minimum liquid level valve is located on the water outlet pipe at the bottom of the accumulator and is used to cut off the water outlet when the liquid level in the accumulator is too low.

[0014] Each roughing mill unit includes Roughing Mill Unit 1 and Roughing Mill Unit 2, which are connected in parallel.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. A collaborative protection system is constructed from three levels—liquid level protection, pressure protection, and pre-protection control—to prevent air leakage and pressure loss in the high-pressure water descaling accumulator. Liquid level protection serves as the primary protection, solving the protection failure problem caused by liquid level gauge jamming and detection distortion through automatic early warning of liquid level deviation and one-button switching. Pressure protection serves as the auxiliary protection, compensating for the poor tracking performance of the magnetic float liquid level gauge. Pre-protection control, through intelligent adjustment of pump speed, reserves water volume in advance, forming a comprehensive and multi-level protection mechanism to reduce the probability of air leakage and pressure loss accidents in the accumulator. 2. By setting an automatic early warning for liquid level deviation, the feedback values ​​of the two accumulator level gauges are compared in real time. When the liquid level deviation exceeds the set threshold, an alarm is automatically triggered. The early warning mechanism can detect abnormalities as soon as the level gauge becomes stuck or the detection is distorted, providing a guarantee for operators to handle the situation in a timely manner. At the same time, through one-button switching via HMI, the liquid level interlock control can be quickly switched to another normal level gauge in the event of a level gauge failure, ensuring that the liquid level protection is continuously effective and avoiding major equipment accidents such as air leakage and pressure loss in the accumulator due to level gauge detection distortion. 3. While retaining the original minimum flow valve that closes when the liquid level is low, an accumulator pressure protection interlock is added; when the pressure in the accumulator tank is lower than the set value, the minimum flow valve is automatically closed; the pressure protection serves as an auxiliary and redundant function to the liquid level protection, effectively compensating for the poor tracking performance of the magnetic float level gauge during the rolling process. Even if the level gauge is stuck at a high liquid level, the pressure protection can still act in time when the actual liquid level is too low, preventing the accumulator from leaking air and achieving dual redundancy of the protection function. 4. Through a liquid level and pressure pre-protection control strategy, the speed of the descaling pump group is automatically controlled according to the descaling command and the pressure status of the accumulator. When a descaling command is received or the accumulator pressure is lower than the set value, the pump group automatically speeds up to high speed to reserve water in advance. After descaling is completed, the timing of speed reduction is intelligently controlled according to the pressure status to ensure that the accumulator maintains sufficient water volume. Through this control strategy, the accumulator pressure can be stably controlled between 18 and 21 MPa, and the corresponding liquid level is maintained between 2200 and 3000 mm, effectively ensuring pressure stability and water demand during multi-point descaling, while avoiding pump group vibration and insufficient descaling pressure caused by poor liquid level gauge tracking. 5. A standardized operating procedure of "one observation, two comparisons, and three switching" has been formed, enabling operators to quickly judge and handle level gauge malfunctions according to the standard procedure, reducing the difficulty of operation and the risk of misoperation, and improving operation and maintenance efficiency. At the same time, the implementation of the one-click switching function simplifies the operation steps, shortens the fault handling time from minutes to seconds, and minimizes the impact of faults on production. 6. By optimizing the pump set speed control strategy, energy-saving operation of the pump set can be achieved while ensuring descaling pressure and water consumption. After the descaling operation is completed, the pump set will automatically reduce its speed to a low speed when the accumulator pressure reaches the set value, effectively reducing power consumption and achieving the purpose of saving water and electricity. At the same time, by preventing accumulator leakage and pressure loss accidents, the risk of equipment damage is reduced, maintenance costs are reduced, and the service life of the equipment is extended. 7. This invention improves upon the existing descaling system's equipment configuration, eliminating the need for large-scale modifications to the original system. It can be achieved simply by adding control logic and HMI screen functionality, resulting in low investment costs and a short implementation cycle. Attached Figure Description

[0016] Figure 1It is a collaborative control device to prevent the high-pressure water descaling accumulator from losing air pressure.

[0017] Figure 2 It is the accumulator liquid level differential pressure feedback.

[0018] Figure 3 This is a normal liquid level curve. Figure 4 This is a liquid level curve during a malfunction; Figure 5 This is the flowchart for the liquid level deviation alarm.

[0019] Figure 6 This is a diagram showing the liquid level deviation alarm information.

[0020] Figure 7 This is a flowchart of the one-click switching process for liquid level control.

[0021] Figure 8 This is a schematic diagram of the one-button switching operation for liquid level control.

[0022] Figure 9 This is the flow chart for the minimum liquid level valve.

[0023] Figure 10 This is a flowchart of the acceleration process.

[0024] Figure 11 This is a flowchart of the speed reduction process.

[0025] In the diagram: 1. Accumulator; 2. Descaling pump unit; 3. Minimum liquid level valve; 4. Minimum flow valve; 5. Pneumatic gate valve; 6. Air compressor unit. Detailed Implementation

[0026] The present invention will now be described in detail with reference to the accompanying drawings, but it should be noted that the implementation of the present invention is not limited to the following embodiments.

[0027] The following embodiments are implemented based on the technical solution of the present invention, providing detailed implementation methods and specific operation processes. However, the scope of protection of the present invention is not limited to the following embodiments. Unless otherwise specified, the methods used in the following embodiments are conventional methods. Example 1:

[0028] See Figure 1 , oneA coordinated control device for preventing air leakage and pressure loss in a high-pressure water descaling accumulator includes a minimum flow valve 4, a minimum liquid level valve 3, a pressure sensor P, a level gauge, and a descaling pump set 2. The outlet of the accumulator 1 is equipped with a pressure sensor P to detect the water tank pressure of the accumulator 1. Each accumulator 1 water tank is equipped with a level gauge to detect the liquid level of the accumulator 1. The descaling pump set 2 is located on the pipeline between the water source and the accumulator 1. The accumulator 1 stores high-pressure water and replenishes water during multi-point descaling. The minimum flow valve 4 is located on the pipeline at the outlet of the descaling pump set 2 to maintain the pump set at minimum flow rate during non-descaling operations. The minimum liquid level valve 3 is located on the bottom outlet pipe of the accumulator 1 to cut off the water supply when the liquid level in the accumulator 1 is too low, preventing gas from entering the high-pressure water system. Each roughing mill unit includes roughing mill set one and roughing mill set two, which are connected in parallel.

[0029] A collaborative control method for preventing air leakage and pressure loss in high-pressure water descaling accumulators, see [link to relevant documentation]. Figure 2-11 ,include: S1. Automatic warning for liquid level deviation; Under normal circumstances, since both accumulator #1 and accumulator #2 are connected to the air compressor unit: P 空压机组 =P1=P2; P1 = P3 + ρgh1; P2 = P3 + ρgh2; in: P 空压机组 This indicates the pressure of the air compressor unit, in MPa. P1 represents the gas pressure inside accumulator #1, in MPa; P2 represents the gas pressure inside accumulator #2, in MPa; P3 represents the outlet pipeline pressure of the descaling pump unit, in MPa; ρ represents the density of water, with units of kg / m³; h1 represents the liquid level of accumulator #1, in mm; h2 represents the liquid level of accumulator #2, in mm; g represents the acceleration due to gravity, and its unit is m / s².

[0030] Theoretically, h1=h2. However, considering equipment installation accuracy and sensor error, the actual liquid level feedback value has a deviation of less than 100mm. When the liquid level gauge becomes stuck or malfunctions, the feedback value of the faulty liquid level gauge remains unchanged or changes abruptly, while the feedback value of the normal liquid level gauge changes with water consumption, resulting in a liquid level deviation of Δh=|h2 between the two liquid level gauges. 1- -h2| increases significantly.

[0031] See Figure 5Write a liquid level deviation alarm program and execute it periodically in the PLC. The specific program logic is as follows: (1) Collect the feedback value h1 of the level gauge of accumulator #1 and the feedback value h2 of the level gauge of accumulator #2; (2) Calculate the absolute value of the liquid level deviation Δh = |h1 - h2|; (3) Compare Δh with the preset liquid level deviation threshold of 300mm; (4) When Δh continuously exceeds the set threshold for a preset time of 3 seconds, the system determines that the level gauge is stuck or has a detection distortion fault; (5) Trigger an alarm signal and generate an alarm on the HMI screen as follows: Figure 6 The warning message shown also records the alarm time and the current liquid level value, reminding operators to handle the situation promptly. (6) When Δh returns to normal (less than the set threshold) and remains stable for a certain period of time, the alarm will be automatically cleared.

[0032] The above-mentioned liquid level deviation alarm procedure can detect abnormalities immediately when the liquid level gauge malfunctions, providing a guarantee for operators to handle the situation in a timely manner and effectively preventing accumulator leakage and pressure loss accidents caused by liquid level gauge detection distortion.

[0033] S2, One-button switching for liquid level control; Figure 7 and Figure 8 Under normal circumstances, the level gauge of accumulator #1 participates in the level interlock control of accumulator #1, and the level gauge of accumulator #2 participates in the level interlock control of accumulator #2. When a malfunction is detected in a level gauge, the operator can switch it with a single click using the switching button on the HMI screen.

[0034] The one-click switching function is executed by the PLC program, specifically including the following steps: (1) Read the liquid level signal status of the faulty level gauge corresponding to the faulty accumulator; (2) Remove the level signal of the faulty level gauge from the level interlock control program of the corresponding accumulator; (3) At the same time, the liquid level signal of another normal liquid level gauge is connected to the liquid level interlock control program of the accumulator; (4) Update the HMI screen display and display the number of the level gauge currently involved in the level interlock control.

[0035] The above steps achieve redundant switching of the liquid level interlock control signal, ensuring the accumulator's liquid level protection function remains effective in the event of a liquid level gauge failure. After the faulty liquid level gauge is replaced, the original control mode can be restored via a one-button switch.

[0036] Meanwhile, the operation plan of "one observation, two comparisons, and three switching" is combined: observe the liquid level deviation alarm through HMI, compare the liquid level deviation value to determine the faulty liquid level gauge, and perform a one-click switching operation through the HMI screen.

[0037] S3, Accumulator pressure protection; To compensate for the poor tracking performance of the magnetic float level gauge, a pressure interlock protection is added while retaining the original feature of closing the minimum flow valve when the liquid level is low. The pressure detection signal of the descaling accumulator is selected as the protection signal point. When the water tank pressure of the accumulator is lower than 12MPa, the minimum liquid level valve is closed. While maintaining the original principle of closing the minimum flow valve when the liquid level is low, a pressure interlock is added. When the pressure in the accumulator tank is less than 12MPa, the minimum flow valve is closed to prevent air leakage from the accumulator. See [link / details]. Figure 9 .

[0038] S4. Pre-protection of liquid level and pressure; The water in the accumulator serves as a supplement for descaling water volume and pressure. When descaling at multiple points (more than two points) requires a large amount of water, the water level in the accumulator will drop rapidly with the increase in on-site water consumption, causing the accumulator to lose pressure. Controlling the lifting and lowering speed of the hydraulic coupling by controlling the liquid level to control the output pressure of the descaling pump is clearly insufficient to meet the pressure requirements of multi-point descaling and poses significant safety hazards. The root cause is the poor water quality, numerous impurities in the pipeline, and poor tracking performance of the magnetic float level gauge, resulting in a distortion of the relationship between the accumulator tank level detection and the accumulator pressure. This leads to pump vibration, low multi-point descaling pressure, and air leakage and pressure loss in the accumulator tank. Therefore, to meet the on-site descaling water consumption, it is necessary to ensure that the accumulator level is maintained at a certain height in advance to accommodate the water consumption during multi-point descaling.

[0039] To meet the water demand during multi-point descaling and to avoid accumulator pressure loss due to poor level gauge tracking, the following pre-protection control is implemented. (1) Speed ​​control of descaling pump unit, see Figure 10 : When the descaling PLC receives the first-level descaling command of the roughing mill (i.e., the descaling jet valve in any area of ​​the roughing mill is opened) or the water tank pressure of the accumulator is lower than the set pressure of 18MPa, the minimum flow valve is closed and the descaling pump group is accelerated to high speed to ensure the descaling pressure and water consumption during multi-point descaling. (2) Speed ​​reduction control of the descaling pump unit, see Figure 11 : After the descaling operation is completed, if the pressure in the accumulator's water tank is lower than the set pressure of 21MPa, the descaling pump set will maintain a high speed and continue to replenish water and pressure to the accumulator until the pressure reaches 21MPa before it can slow down; if the pressure in the accumulator's water tank is higher than 21MPa, it will directly slow down to a low speed to achieve the purpose of saving water and electricity.

[0040] Through the above control, the pressure of the accumulator can be stably controlled between 18 and 21 MPa, and the corresponding liquid level of the accumulator is between 2200 and 3000 mm (depending on the pressure value of the air compressor unit), effectively ensuring that the descaling accumulator does not leak air or lose pressure.

[0041] S5. Equipment debugging; During downtime for maintenance, we completed the writing and debugging of the automatic early warning program for liquid level deviation, the one-button switching operation program for liquid level control, the accumulator pressure protection program, and the liquid level and pressure pre-protection program to ensure reliable system operation.

[0042] This invention constructs a collaborative protection system to prevent air leakage and pressure loss in high-pressure water descaling accumulators from three levels: level protection, pressure protection, and pre-protection control. Level protection, as the primary protection, solves the protection failure problem caused by level gauge jamming and detection distortion through automatic level deviation warning and one-button switching. Pressure protection, as auxiliary protection, compensates for the poor tracking performance of magnetic float level gauges. Pre-protection control, through intelligent adjustment of pump speed, pre-stores water volume, forming a comprehensive, multi-layered protection mechanism to reduce the probability of accumulator air leakage and pressure loss accidents. By setting an automatic level deviation warning, the feedback values ​​of the two accumulator level gauges are compared in real time. When the level deviation exceeds a set threshold, an automatic alarm is triggered. The warning mechanism can detect level gauge jamming or other issues. The system detects anomalies immediately upon detection of level gauge distortion, ensuring timely handling by operators. Simultaneously, a one-button switch via HMI allows for rapid transfer of level interlock control to a functioning level gauge in case of malfunction, ensuring continuous and effective level protection and preventing major equipment accidents such as accumulator leakage and pressure loss due to level gauge detection distortion. In addition to retaining the original minimum flow valve closure at low levels, a pressure protection interlock for the accumulator is added. When the accumulator tank pressure falls below the set value, the minimum flow valve automatically closes. This pressure protection serves as an auxiliary and redundant measure to the level protection, effectively compensating for the poor tracking performance of magnetic float level gauges during rolling. Even if the level gauge is stuck at a high level, the pressure protection can still activate promptly when the actual level is too low, preventing accumulator leakage. The system employs a dual redundancy protection mechanism. Through a level and pressure pre-protection control strategy, the pump unit's speed is automatically controlled based on the descaling command and accumulator pressure status. When a descaling command is received or the accumulator pressure falls below a set value, the pump unit automatically accelerates to high speed to pre-store water volume. After descaling, the timing of speed reduction is intelligently controlled based on the pressure status to ensure the accumulator maintains sufficient water volume. This control strategy allows the accumulator pressure to be stably controlled between 18 and 21 MPa, with the corresponding liquid level maintained between 2200 and 3000 mm, effectively ensuring pressure stability and water demand during multi-point descaling. It also avoids pump unit vibration and insufficient descaling pressure caused by poor level gauge tracking. This system establishes a "one observation, two comparisons" approach. The standardized "three-way switching" operation plan enables operators to quickly diagnose and handle level gauge malfunctions according to standard procedures, reducing operational difficulty and the risk of misoperation, and improving maintenance efficiency. At the same time, the one-click switching function simplifies operation steps, reducing fault handling time from minutes to seconds, minimizing the impact of faults on production. By optimizing the pump set speed control strategy, energy-saving operation of the pump set is achieved while ensuring descaling pressure and water consumption. After the descaling operation is completed, the pump set automatically slows down to a low speed when the accumulator pressure reaches the set value, effectively reducing power consumption and achieving the goal of saving water and electricity. At the same time, by preventing accumulator air leakage and pressure loss accidents, the risk of equipment damage is reduced, maintenance costs are lowered, and the service life of the equipment is extended.This invention improves upon the existing descaling system's equipment configuration, requiring no large-scale modifications to the original system. It can be implemented simply by adding control logic and HMI display functionality, resulting in low investment costs and a short implementation cycle.

Claims

1. A collaborative control method for preventing air leakage and pressure loss in a high-pressure water descaling accumulator, characterized in that, include: Compare the level feedback values ​​of the two accumulator level gauges, and issue an early warning message when the level deviation exceeds the set threshold; When a level gauge malfunctions, control of the malfunctioning level gauge can be switched to another level gauge with a single click via the human-machine interface. Set the accumulator pressure protection. When the pressure in the accumulator tank is lower than the set value one, close the minimum liquid level valve. The set value one ranges from 10 to 13 MPa. Based on the descaling command and the water tank pressure status of the accumulator, the speed of the descaling pump set is controlled to increase and decrease, and pre-protection of liquid level and pressure is implemented.

2. The collaborative control method for preventing air leakage and pressure loss in a high-pressure water descaling accumulator according to claim 1, characterized in that, The set threshold for liquid level deviation is 200~400mm. When the absolute value of the liquid level deviation between the liquid level feedback values ​​of the two accumulator liquid level gauges is greater than the set threshold for liquid level deviation, an early warning message is generated on the HMI.

3. The collaborative control method for preventing air leakage and pressure loss in a high-pressure water descaling accumulator according to claim 1, characterized in that, The one-click switching refers to: setting a switching button on the HMI screen; when the operator clicks the switching button, it triggers the PLC program to perform redundant switching of the liquid level interlock control signal, ensuring that the accumulator's liquid level protection remains effective in the event of a liquid level gauge failure. Specifically, this includes: (1) Read the liquid level signal status of the faulty level gauge corresponding to the faulty accumulator; (2) Remove the level signal of the faulty level gauge from the level interlock control program of the corresponding accumulator; (3) At the same time, the liquid level signal of another normal liquid level gauge is connected to the liquid level interlock control program of the accumulator; (4) Update the HMI screen display and display the number of the level gauge currently involved in the level interlock control.

4. The collaborative control method for preventing air leakage and pressure loss in a high-pressure water descaling accumulator according to claim 1, characterized in that, The pressure protection is as follows: while maintaining the original low liquid level of the corresponding accumulator and closing the minimum liquid level valve, a pressure interlock is added: When the pressure in the water tank of the corresponding accumulator is lower than the set pressure value, the minimum liquid level valve is closed.

5. The collaborative control method for preventing air leakage and pressure loss in a high-pressure water descaling accumulator according to claim 1, characterized in that, The aforementioned level and pressure pre-protection includes: (1) When a descaling command is received in the roughing zone or the water tank pressure of the accumulator is lower than the set pressure value 2, the minimum flow valve is closed and the descaling pump group is accelerated to the high speed state. The value range of the set value 2 is 15-18MPa. (2) After the descaling operation is completed: If the pressure in the accumulator's water tank is lower than the set pressure value three, the pump unit will maintain high speed until the pressure in the accumulator's water tank reaches the set pressure value three and maintain it for 75 seconds before reducing the speed. The set pressure value three ranges from 20 to 22 MPa. If the pressure in the accumulator's water tank is greater than the set pressure value, it needs to be maintained for 75 seconds before reducing the speed to a low speed. This is to avoid the pump set frequently increasing or decreasing speed due to the short interval between the next descaling operations. in: The set pressure value two is less than the set pressure value three.

6. A collaborative control device for preventing air leakage and pressure loss in a high-pressure water descaling accumulator to implement the method described in claims 1-5, characterized in that, This includes a minimum flow valve, a minimum liquid level valve, a pressure sensor, a level gauge, and a descaling pump unit; The outlet of the accumulator is equipped with a pressure sensor to detect the water tank pressure of the accumulator; Each accumulator tank is equipped with a level gauge to detect the accumulator level; The descaling pump set is installed on the pipeline between the water source and the accumulator. The accumulator is used to store high-pressure water and supplement the water supply during multi-point descaling. The minimum flow valve is located on the pipeline at the outlet of the descaling pump set and is used to maintain the pump set at the minimum flow rate when it is not in the descaling state. The minimum liquid level valve is located on the water outlet pipe at the bottom of the accumulator and is used to cut off the water outlet when the liquid level in the accumulator is too low.

7. The collaborative control device for preventing air leakage and pressure loss in a high-pressure water descaling accumulator according to claim 6, characterized in that, Each roughing mill unit includes roughing mill unit one and roughing mill unit two, which are connected in parallel.

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