Intelligent control system of closed cooling water pump and cooling sludge drying system

Abstract

The invention provides an intelligent control system of closed cooling water pumps and a cooled sludge drying system. The intelligent control system comprises a plurality of closed cooling water pumps, a plurality of outlet regulating valves, a main pipe, a pressure monitor and an intelligent controller, one end of each closed cooling water pump is connected with an external closed cooling water tank, the other end of each closed cooling water pump is connected with an outlet adjusting valve, all the outlet adjusting valves are connected to the main pipe, a pressure monitor is installed on the main pipe, and the intelligent controller is in electric signal connection with the closed cooling water pumps, the outlet adjusting valves and the pressure monitor. The intelligent controller receives the total pressure value sent by the pressure monitor and adjusts the opening degree of the outlet adjusting valve connected with each closed cooling water pump according to the total pressure value, so that the actual pressure value of the outlet of the main pipe is kept consistent with the pressure set value. The technical problems that in the prior art, the opening degree of a valve cannot be automatically adjusted according to the water consumption requirement, and water pressure stabilization is not facilitated are solved.

Description

Technical Field

[0001] The present invention relates to the field of sewage treatment, and in particular to an intelligent control system of a closed cooling water pump and a cooling sludge drying system. Background Art

[0002] Closed-loop cooling water pumps are core equipment in sludge drying systems, crucial for efficient and stable operation. They not only maintain system thermal balance through cooling and heat exchange, but also contribute to energy conservation, environmental protection, extended equipment life, and improved system stability, providing crucial support for the successful implementation of sludge drying projects. Existing electric valves at the outlet of closed-loop cooling water pumps are on-off valves, unable to automatically adjust the valve opening based on water demand, hindering water pressure stability. Summary of the Invention

[0003] Based on the above problems, the present invention proposes an intelligent control system for a closed cooling water pump and a cooling sludge drying system. This solves the technical problem in the prior art that the electric valve at the outlet of the closed cooling water pump is of a switch type, which is not convenient for automatically adjusting the valve opening according to water demand and is not conducive to stabilizing water pressure. It also solves the technical problem in the prior art that monitoring personnel are required to pay close attention to the operation of the closed cooling water pump, which increases the workload. The intelligent control system for the closed cooling water pump provided by the present invention can intelligently control the closed cooling water pump and the outlet regulating valve, and control the opening of each outlet regulating valve according to the total pressure value of the main pipe, thereby ensuring operational safety.

[0004] The present invention proposes an intelligent control system for a closed cooling water pump, comprising:

[0005] Multiple closed cooling water pumps, multiple outlet regulating valves, main pipes, pressure monitors and intelligent controllers;

[0006] One end of each closed cooling water pump is connected to an external closed cooling water tank, and the other end is connected to an outlet regulating valve. All outlet regulating valves are connected to the main pipe, which is equipped with a pressure monitor. The intelligent controller is connected to the closed cooling water pump, outlet regulating valve and pressure monitor through electrical signals.

[0007] The intelligent controller receives the total pressure value sent by the pressure monitor and adjusts the opening of the outlet regulating valve connected to each closed cooling water pump according to the total pressure value, so that the actual pressure value of the main pipe outlet is consistent with the pressure set value.

[0008] In addition, the number of closed cooling water pumps is 3;

[0009] When the total pressure value received by the intelligent controller is greater than the pressure setting value and the current value of a single running closed cooling water pump is monitored to be less than the preset current value, only the currently running closed cooling water pump is operated, and the other closed cooling water pumps are shut down. The closed cooling water pump with the longer outage time is selected as the first backup closed cooling water pump.

[0010] In addition, when the total pressure value is monitored to be less than the pressure setting value or the current value of a single running closed cooling water pump is monitored to be greater than a preset current value, the intelligent controller starts the first standby closed cooling water pump.

[0011] In addition, when a single closed cooling water pump is running, the intelligent controller adjusts the outlet regulating valve of the running closed cooling water pump so that the actual pressure value of the main pipe is greater than the pressure setting value, and the intelligent controller controls the current of the running closed cooling water pump to be less than the preset current value.

[0012] In addition, when the intelligent controller detects that the pressure value of the main pipe is lower than the pressure setting value or the current of the running closed cooling water pump is greater than the preset current value, the intelligent controller interlocks and starts the first standby closed cooling water pump, so that the opening of the outlet regulating valve of the first standby closed cooling water pump is consistent with the opening of the outlet regulating valve of the original running closed cooling water pump.

[0013] In addition, when two closed cooling water pumps are running at the same time, the intelligent controller monitors the current of the two closed cooling water pumps. If the current of any closed cooling water pump is greater than the preset current value, the closed cooling water pump connected to the outlet regulating valve with a larger opening will be closed.

[0014] In addition, when a fault is detected in the running closed cooling water pump and it trips, the first standby closed cooling water pump is started through interlocking.

[0015] In addition, the pressure setting value is 0.2MPa and the preset current value is 95A.

[0016] In addition, the intelligent control system also includes a control interface, which provides input of preset current values ​​and pressure setting values, and displays the status of the closed cooling water pump.

[0017] The present invention also provides a cooling sludge drying system, comprising an intelligent control system for a closed cooling water pump as described in any one of the above items.

[0018] The present invention solves the technical problem in the prior art that the electric valve at the outlet of a closed cooling water pump is of the on-off type, making it difficult to automatically adjust the valve opening according to water demand and thus detrimental to stabilizing water pressure. It also solves the technical problem in the prior art that monitoring personnel must constantly monitor the operation of the closed cooling water pump, increasing their workload. The intelligent control system for the closed cooling water pump provided by the present invention can intelligently control the closed cooling water pump and the outlet regulating valve, controlling the opening of each outlet regulating valve based on the total pressure of the main pipe, thereby ensuring operational safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of an intelligent control system for a closed cooling water pump provided by one embodiment of the present invention;

[0020] Figure 2 Schematic diagram of a closed cooling water pump control system in the prior art. DETAILED DESCRIPTION

[0021] The present invention is further described in detail below with reference to specific embodiments and accompanying drawings, which are intended only to elaborate on the specific embodiments of the present invention and do not impose any limitation on the present invention. The scope of protection of the present invention shall be subject to the claims.

[0022] Reference Figure 1 The present invention proposes an intelligent control system for a closed cooling water pump, comprising:

[0023] Multiple closed cooling water pumps, multiple outlet regulating valves FV, ​​main pipe P, pressure monitor and intelligent controller;

[0024] One end of each closed cooling water pump is connected to an external closed cooling water tank, and the other end is connected to an outlet regulating valve. All outlet regulating valves are connected to the main pipe P, which is equipped with a pressure monitor. The intelligent controller is connected to the closed cooling water pump, the outlet regulating valve FV and the pressure monitor through electrical signals.

[0025] The intelligent controller receives the total pressure value sent by the pressure monitor and adjusts the opening of the outlet regulating valve connected to each closed cooling water pump according to the total pressure value, so that the actual pressure value of the main pipe outlet is consistent with the pressure set value.

[0026] Sludge drying systems belong to the field of sewage treatment technology, involving sludge treatment and resource utilization. Sludge drying is a critical step after sewage treatment, aiming to address high moisture content, reduce sludge volume, lower treatment costs, and achieve resource utilization. Sludge is a byproduct of the sewage treatment process, and drying technology is a key step in sludge treatment. Thermal energy is used to evaporate the water in the sludge, reducing its moisture content to 10%-40%. The dried sludge is then incinerated to generate power, achieving energy recovery and driving the shift in sludge treatment from "volume reduction" to "resource utilization."

[0027] In sludge drying systems, closed systems offer advantages such as water conservation, energy conservation, and pollution reduction, making them suitable for energy-intensive drying processes. Closed cooling water pumps are used to cool the drying equipment, ensuring system thermal balance and stable operation. Closed cooling water pumps play a crucial role, primarily responsible for heat exchange and temperature control in the cooling system. The following are their main functions:

[0028] 1. Cooling sludge drying equipment

[0029] A large amount of heat is generated during the sludge drying process. The closed cooling water pump helps the equipment dissipate heat by circulating cooling water, keeping the equipment running within a safe temperature range.

[0030] 2. Maintain system thermal balance

[0031] Through a closed-loop system, the cooling water pump removes heat from the equipment, ensuring system thermal balance and preventing overheating that could cause equipment damage or reduced efficiency. The closed system reduces contact between cooling water and the outside world, reducing the risk of water contamination.

[0032] 3. Energy saving and environmental protection

[0033] Closed cooling water pumps reduce water waste by recycling cooling water, while also lowering energy consumption and reducing wastewater discharge, thus complying with environmental protection requirements.

[0034] 4. Improve equipment operation stability

[0035] By precisely controlling the cooling water flow and water supply pressure, stable equipment operation is ensured and the failure rate is reduced.

[0036] 5. Extend equipment life

[0037] Effective cooling can reduce wear and aging of equipment caused by high temperatures, extend the service life of equipment, and thus reduce maintenance and replacement costs.

[0038] Closed-loop cooling water pumps are core equipment in sludge drying systems, crucial for ensuring efficient and stable operation. They not only maintain system thermal balance through cooling and heat exchange but also provide crucial support for the successful implementation of sludge drying projects by conserving energy and protecting the environment, extending equipment life, and improving system stability. Therefore, the selection and optimization of closed-loop cooling water pumps are crucial when designing and operating sludge drying systems.

[0039] The following uses the closed cooling water supply system of the sludge drying project as an example to introduce how the three closed cooling water pumps work together through application scenarios. Figure 2 As shown:

[0040] A water replenishment switch gate is installed at the cooling water tank inlet. This gate automatically opens and closes based on the tank liquid level, maintaining the tank level within a defined range and meeting the water needs of the back-end equipment. Three closed-loop cooling water pumps are installed at the tank outlets, each with an electric on / off valve (EV). The complete water supply system consists of three identically sized pumps, a control system, pressure sensors, water level sensors, and supporting piping and valves. During normal operation, a single or dual pump can meet the system's water needs. However, pump failures, such as impeller damage or electrical malfunctions, can result in a reduction or even complete interruption of water supply, potentially damaging back-end machinery and equipment—an unacceptable occurrence in industrial continuous production systems. Therefore, redundant pumps are added to enhance the stability of the water supply system.

[0041] Modern sludge drying systems are typically equipped with simple automated control systems to optimize operating parameters. The water tank level control valve automatically opens and closes to maintain a sufficient water level. Three closed-loop cooling water pumps are used to supply the system. During low-load water supply, one closed-loop cooling water pump is started and the outlet valve is opened. However, because the outlet valve is an on-off valve, it can be difficult to maintain stable outlet pressure due to varying water demand at the downstream end. Maintaining stable outlet pressure requires manual adjustment of the closed-loop cooling water pump outlet valve opening, which requires significant on-site intervention and a relatively low level of automated control. Under high-load water supply, the water supply pressure from a single closed-loop cooling water pump may be insufficient. In this case, a backup pump is activated and the outlet valve opening is adjusted to ensure that the downstream water pressure meets actual water demand. In the event of a system failure, operators must promptly activate the backup pump to take over the work of the failed component, thereby minimizing system downtime. Monitoring personnel need to always pay attention to the operating conditions of the cooling water supply system and regularly record the operating data of the closed cooling water pump, including parameters such as pressure and current, and analyze them regularly. By analyzing the data, potential problems can be discovered in time, such as pump performance degradation, changes in pipeline resistance, etc., and then appropriate measures can be taken to adjust and optimize them to ensure the long-term stability of the closed cooling water pump water supply.

[0042] The existing technology currently has the following defects:

[0043] 1. Due to factors such as design, the electric valve at the outlet of the closed cooling water pump is of switch type, which is not convenient for automatically adjusting the valve opening according to water demand and is not conducive to stabilizing the water pressure.

[0044] 2. Monitoring personnel must constantly monitor the operating conditions of the cooling water supply system. Equipment failures must be detected immediately and manually activated to bring backup equipment online. This increases the monitoring burden on operators and requires them to remain vigilant.

[0045] 3. Due to the influence of system water consumption, the closed cooling water pumps operate in different modes, either single pump operation or dual pump operation. For a long time, the operating time of the three closed cooling water pumps will vary or even deviate greatly. This cannot ensure the balanced operation of the three closed cooling water pumps. It is also not conducive to the production enterprise's management of regular equipment rotation system.

[0046] 4. During operation, two closed-loop cooling water pumps can interfere with each other due to factors such as pump installation and asymmetric piping. If the speeds of the two closed-loop cooling water pumps are inconsistent, vibration will occur, affecting their service life and efficiency, and reducing their performance. Furthermore, this will increase pump noise and affect the operating environment. To mitigate these drawbacks, appropriate measures should be taken to ensure that the output of the two closed-loop cooling water pumps is close to each other, enabling synchronized adjustments during operation.

[0047] To solve the above problems, the present invention proposes an intelligent control system for a closed cooling water pump, comprising:

[0048] Multiple closed cooling water pumps, multiple outlet regulating valves, main pipes, pressure monitors and intelligent controllers;

[0049] One end of each closed cooling water pump is connected to an external closed cooling water tank, and the other end is connected to an outlet regulating valve. All outlet regulating valves are connected to the main pipe, which is equipped with a pressure monitor. The intelligent controller is connected to the closed cooling water pump, outlet regulating valve and pressure monitor through electrical signals.

[0050] The intelligent controller receives the total pressure value sent by the pressure monitor and adjusts the opening of the outlet regulating valve connected to each closed cooling water pump according to the total pressure value, so that the actual pressure value of the main pipe outlet is consistent with the pressure set value.

[0051] The intelligent controller in the present invention monitors the closed cooling water pump, the outlet regulating valve and the pressure monitor. The intelligent controller analyzes the data of the pressure monitor, the current value of the closed cooling water pump, the operating status and the opening of the outlet regulating valve, and controls the operating status and the number of operations of the closed cooling water pump according to the analysis results. The opening of the outlet regulating valve is controlled to meet the pressure value requirements of the main pipe, and the outlet water pressure is ensured to be stable by accurately regulating the water pressure at the main pipe outlet.

[0052] When the outlet regulating valve of a single closed cooling water pump is put into automatic operation, the deviation analysis is performed based on the pressure setting value of the main pipe and the actual total pressure value. The throttle valve opening of the outlet regulating valve of the closed cooling water pump is calculated by setting reasonable proportional / integral parameters. During the control process, if the current value of the closed cooling water pump is too high, the outlet throttle valve opening is prohibited from being opened further, and the logic is used to determine whether the standby closed cooling water pump needs to be started. By monitoring the operating status of the standby closed cooling water pump, it is determined whether the standby closed cooling water pump should be automatically controlled, thereby stabilizing the water pressure of the system main pipe. When the outlet regulating valve is in automatic control state Figure 1 A represents it and M represents manual operation.

[0053] The present invention solves the technical problem in the prior art that the electric valve at the outlet of a closed cooling water pump is of the on-off type, making it difficult to automatically adjust the valve opening according to water demand and thus detrimental to stabilizing water pressure. It also solves the technical problem in the prior art that monitoring personnel must constantly monitor the operation of the closed cooling water pump, increasing their workload. The intelligent control system for the closed cooling water pump provided by the present invention can intelligently control the closed cooling water pump and the outlet regulating valve, controlling the opening of each outlet regulating valve based on the total pressure of the main pipe, thereby ensuring operational safety.

[0054] In one embodiment, the number of closed cooling water pumps is 3;

[0055] When the total pressure value received by the intelligent controller is greater than the pressure setting value and the current value of a single running closed cooling water pump is monitored to be less than the preset current value, only the currently running closed cooling water pump is operated, and the other closed cooling water pumps are shut down. The closed cooling water pump with the longer outage time is selected as the first backup closed cooling water pump.

[0056] Optionally, the pressure setting value is 0.2 MPa and the preset current value is 95A.

[0057] When the total pressure is within a reasonable range and the current of the operating closed cooling water pump is also within the normal range, the currently operating closed cooling water pump can be kept running, and the other closed cooling water pumps do not need to be running and can be placed in standby mode. At this time, the closed cooling water pump with the longest outage time is selected as the first backup closed cooling water pump to balance the operating time of the closed cooling water pumps, thereby ensuring the overall operating life is increased. For example, if the operating time of closed cooling water pump A is 205.8 hours, the operating time of B is 133.2 hours, and the operating time of C is 184.5 hours, C is selected as the first backup closed cooling water pump. When the operating closed cooling water pump fails, C will be the first choice for startup.

[0058] Optionally, the operating time of each closed cooling water pump is automatically recorded through intelligent control logic, and the first backup closed cooling water pump is selected through logical analysis according to the requirements of the equipment regular rotation system to ensure that the three closed cooling water pumps achieve balanced operation for a long time.

[0059] Optionally, in order to prevent the standby closed cooling water pump from causing the current value of the original running closed cooling water pump to be too large during the startup process, the MA hand-held operator algorithm block output in the intelligent controller adds a prohibition rise condition. The prohibition rise condition is that when the operating current value of the closed cooling water pump is greater than 95A, the outlet regulating valve is prohibited from opening with a trend delay of 5S. The MA hand-held operator algorithm is a soft hand-held operator algorithm based on the operator station. It is an algorithm block in the logic control system and has two working modes, automatic and manual, which can be switched by the operator by sending commands.

[0060] In one embodiment, when the total pressure value is monitored to be less than the pressure setting value or the current value of a single running closed cooling water pump is monitored to be greater than a preset current value, the intelligent controller starts the first standby closed cooling water pump.

[0061] Considering that closed cooling water pumps may malfunction during operation, such as impeller damage or electrical failure, resulting in an inability to pump water normally, this can directly reduce or even completely interrupt water supply, causing damage to downstream mechanical equipment. This is unacceptable in industrial continuous production systems. Therefore, redundant pumps are added to increase the stability of the water system.

[0062] When the total pressure value monitored is less than the pressure setting value or the current value monitored for a single running closed cooling water pump is greater than the preset current value, it indicates that the currently running closed cooling water pump may have failed. Therefore, the intelligent controller automatically starts the first backup closed cooling water pump to supply water to ensure continuous industrial production.

[0063] In one embodiment, when a single closed cooling water pump is running, the intelligent controller adjusts the outlet regulating valve of the running closed cooling water pump so that the actual pressure value of the main pipe is greater than the pressure setting value, and the intelligent controller controls the current of the running closed cooling water pump to be less than the preset current value.

[0064] When a single closed cooling water pump is running, the intelligent controller adjusts the outlet regulating valve of the running closed cooling water pump so that the actual pressure value of the main pipe is greater than the pressure setting value, for example, greater than 0.2MPa, and the current of the running closed cooling water pump is controlled to be less than the preset current value, for example, 95A. This ensures normal water supply.

[0065] At this point, the other two closed cooling water pumps are not operating and can be put into standby mode, or one can be selected as the standby pump based on the actual situation on site. When both closed cooling water pumps are in standby mode, the intelligent controller collects the historical operating status of the standby closed cooling water pumps and accumulates the historical operating time. Based on the principle of priority based on the longest outage time, the closed cooling water pump that has been out of service longer is selected as the first standby closed cooling water pump.

[0066] In one embodiment, when the intelligent controller detects that the pressure value of the main pipe is lower than the pressure setting value or the current of the running closed cooling water pump is higher than the preset current value, the intelligent controller interlocks and starts the first standby closed cooling water pump, so that the opening of the outlet regulating valve of the first standby closed cooling water pump is consistent with the opening of the outlet regulating valve of the original running closed cooling water pump.

[0067] When an abnormal situation occurs in the running closed cooling water pump, such as accident tripping, equipment protection tripping, main pipe outlet pressure lower than 0.2MPa, or the current value of the closed cooling water pump is greater than 95A, the first standby closed cooling water pump is started by interlocking, and the opening of the outlet regulating valve of the first standby closed cooling water pump is set to be consistent with the opening of the outlet regulating valve of the original running closed cooling water pump. At the same time, the first standby closed cooling water pump is put into automatic operation and adjusted synchronously according to the pressure value set by the intelligent controller.

[0068] If an abnormality occurs in the operating closed-loop cooling water pump, the first backup closed-loop cooling water pump will first adjust its opening according to the original operating closed-loop cooling water pump to maintain system stability. Then, depending on the operating conditions, subsequent adjustments will be made based on the set pressure value and the actual pressure value of the main pipe. At this point, the pump operating mode switches from "one operating, two backup" to "two operating, one backup." The original first backup closed-loop cooling water pump will be interlocked and activated, and the original second backup closed-loop cooling water pump will be simultaneously removed from the backup position. The original second backup closed-loop cooling water pump will be designated as the first backup closed-loop cooling water pump.

[0069] In one embodiment, when two closed cooling water pumps are running at the same time, the intelligent controller monitors the current of the two closed cooling water pumps. If the current of any closed cooling water pump is greater than a preset current value, the closed cooling water pump connected to the outlet regulating valve with a larger opening is closed.

[0070] When two closed-loop cooling water pumps are operating simultaneously, the intelligent controller monitors the current values ​​of both pumps, ensuring they exceed 95A, and controls the current error to within 5A. Implementation strategy: When the current deviation exceeds 5A, the outlet regulating valve with the larger opening is prohibited from opening, and the outlet regulating valve with the smaller opening is prioritized. When the deviation is less than 5A, the two outlet regulating valves can operate synchronously. If a fault occurs in the operating closed-loop cooling water pump and the pump trips, the standby closed-loop cooling water pump is interlocked and started to ensure normal water supply and operation of the system. Interlocked start-up triggers the start command of the standby closed-loop cooling water pump based on the fault condition and is implemented through the drive-level motor algorithm program.

[0071] In one embodiment, when a fault tripping of a running closed cooling water pump is detected, a first backup closed cooling water pump is started in an interlocking manner to ensure normal water supply and operation of the system.

[0072] In one embodiment, the pressure setting value is 0.2 MPa and the preset current value is 95 A. After testing, the pressure setting value of 0.2 MPa and the preset current value of 95 A can ensure stable water supply from the main pipe.

[0073] In one embodiment, the intelligent control system further includes a control interface, which provides input of a preset current value and a pressure setting value, and displays the status of the closed cooling water pump.

[0074] The operator can use the interface to set pressure setpoints, preset current values, and more. The control interface also intuitively displays the cumulative operating time of the closed-loop cooling water pump after logical operations, and indicates whether the outlet regulating valve is in automatic or manual control. This means the outlet regulating valve can be automatically controlled by the intelligent controller or manually controlled by the operator. It also displays the fault status of the backup closed-loop cooling water pump and provides alarm functions.

[0075] The present invention also provides a cooling sludge drying system, comprising an intelligent control system for a closed cooling water pump as described in any one of the above items.

[0076] The present invention solves the technical problem in the prior art that the electric valve at the outlet of a closed cooling water pump is of the on-off type, making it difficult to automatically adjust the valve opening according to water demand and thus detrimental to stabilizing water pressure. It also solves the technical problem in the prior art that monitoring personnel must constantly monitor the operation of the closed cooling water pump, increasing their workload. The intelligent control system for the closed cooling water pump provided by the present invention can intelligently control the closed cooling water pump and the outlet regulating valve, controlling the opening of each outlet regulating valve based on the total pressure of the main pipe, thereby ensuring operational safety.

[0077] MA handheld operator: This algorithm is a soft manual operation algorithm based on the operator station. The algorithm can work in automatic or manual mode, which can be switched by the operator by sending commands.

[0078] Tripping: Tripping is categorized as either protection tripping or accident tripping. A protection trip is defined as a trip caused by a protective condition being triggered during equipment operation. An accident trip is defined as a shutdown caused by electrical or mechanical factors, not a shutdown command from the operator.

[0079] The pump drive motor algorithm block outputs 16 GP points (GP points) that describe the motor's operating status. Each bit is uniquely defined, and input signals and PK commands may alter the GP point value. When bit 11 of the GP point is set to 1, a device protection trip condition is triggered. When bit 12 of the GP point is set to 1, a device protection trip condition is triggered.

[0080] The above description is only the principle and preferred embodiment of the present invention. It should be noted that for those skilled in the art, several other variations can be made based on the principle of the present invention, which should also be considered as the scope of protection of the present invention.

Claims

1. An intelligent control system for a closed cooling water pump, characterized in that: include: Multiple closed cooling water pumps, multiple outlet regulating valves, main pipes, pressure monitors and intelligent controllers; One end of each closed cooling water pump is connected to an external closed cooling water tank, and the other end is connected to an outlet regulating valve. All outlet regulating valves are connected to the main pipe, which is equipped with a pressure monitor. The intelligent controller is connected to the closed cooling water pump, outlet regulating valve and pressure monitor through electrical signals. The intelligent controller receives the total pressure value sent by the pressure monitor and adjusts the opening of the outlet regulating valve connected to each closed cooling water pump according to the total pressure value, so that the actual pressure value of the main pipe outlet is consistent with the pressure set value.

2. The intelligent control system of the closed cooling water pump according to claim 2 is characterized in that: The number of closed cooling water pumps is 3; When the total pressure value received by the intelligent controller is greater than the pressure setting value and the current value of a single running closed cooling water pump is monitored to be less than the preset current value, only the currently running closed cooling water pump is operated, and the other closed cooling water pumps are shut down. The closed cooling water pump with the longer outage time is selected as the first backup closed cooling water pump.

3. The intelligent control system of the closed cooling water pump according to claim 2 is characterized in that: When the total pressure value is monitored to be less than the pressure setting value or the current value of a single running closed cooling water pump is monitored to be greater than a preset current value, the intelligent controller starts the first standby closed cooling water pump.

4. The intelligent control system of the closed cooling water pump according to claim 2, characterized in that: When a single closed cooling water pump is running, the intelligent controller adjusts the outlet regulating valve of the running closed cooling water pump so that the actual pressure value of the main pipe is greater than the pressure setting value, and the intelligent controller controls the current of the running closed cooling water pump to be less than the preset current value.

5. The intelligent control system of the closed cooling water pump according to claim 4, characterized in that: When the intelligent controller detects that the pressure value of the main pipe is lower than the pressure setting value or the current of the running closed cooling water pump is greater than the preset current value, the intelligent controller interlocks and starts the first standby closed cooling water pump, so that the opening of the outlet regulating valve of the first standby closed cooling water pump is consistent with the opening of the outlet regulating valve of the original running closed cooling water pump.

6. The intelligent control system of the closed cooling water pump according to claim 2, characterized in that: When two closed cooling water pumps are running at the same time, the intelligent controller monitors the current of the two closed cooling water pumps. If the current of any closed cooling water pump is greater than the preset current value, the closed cooling water pump connected to the outlet regulating valve with the larger opening will be closed.

7. The intelligent control system of the closed cooling water pump according to claim 6, characterized in that: When a fault is detected in the running closed cooling water pump and it trips, the first standby closed cooling water pump is started through interlock.

8. The intelligent control system of the closed cooling water pump according to claim 2, characterized in that: The pressure setting value is 0.2MPa and the preset current value is 95A.

9. The intelligent control system of a closed cooling water pump according to any one of claims 2 to 8, characterized in that: The intelligent control system also includes a control interface, which provides input of preset current values ​​and pressure setting values, and displays the status of the closed cooling water pump.

10. A cooling sludge drying system, characterized in that: An intelligent control system comprising a closed cooling water pump as described in any one of claims 1 to 9.

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