Closed cooling water system and pressure regulating method thereof

Abstract

The invention relates to a closed cooling water system and a pressure regulating method thereof. The system comprises a cooling unit, a water pump main pipe and a pressure adjusting unit, the pressure regulating unit comprises a closed cooling water pressure regulating bypass door, a closed cooling water pressure regulating door and a recirculation regulating door; the closed cooling water pressure regulating door is arranged on the water pump main pipe and is used for regulating the pressure of the water pump main pipe; the recirculation adjusting door is connected in parallel to two ends of the cooling unit and used for adjusting the pressure of the cooling unit; the closed cooling water pressure regulating bypass door is connected with the closed cooling water pressure regulating door in parallel, and the recirculation regulating door and the closed cooling water pressure regulating bypass door form a standby mother pipe pressure regulating loop which is used for regulating the pressure of the water pump mother pipe under the standby condition. Compared with the prior art, the system has the advantages of reducing power consumption of the cooling water pump, improving system stability and safety and the like.

Description

Technical Field

[0001] The present invention relates to a cooling water system, in particular to a closed cooling water system and a pressure regulating method thereof. Background Art

[0002] In the prior art, the pressure control of a closed cooling water system usually adopts a recirculation method. Although this method can regulate the system pressure, it will lead to an increase in the output of the closed cooling water pump, thereby increasing power consumption.

[0003] The existing closed cooling water system consists of 2 closed cooling water pumps, 2 closed cooling water heat exchangers, 1 closed expansion water tank and heat exchangers of related users. The closed cooling water pump has a speed of 1480r / min and a head of 50m. A recirculation adjustment door is provided between the outlet of the closed cooling water heat exchanger and the inlet of the closed cooling water pump. The pressure of the closed cooling water main pipe is adjusted by the recirculation opening.

[0004] For example, the utility model with publication number CN217814018U discloses an energy-saving closed pump cooling water drive system. By connecting a small-flow variable-frequency closed pump in parallel next to the original closed pump unit, and replacing the manual butterfly valve and manual recirculation adjustment gate in the pipeline with an electric regulating valve and electric regulating gate controlled by a DCS, the problems of unreasonable closed pump selection, unsafe and unreliable operation, and inability to accurately adjust the system flow and pressure remotely are solved.

[0005] However, the system still has the limitation of the recirculation adjustment valve as the only pressure regulation means. If the recirculation adjustment valve fails, the closed cold water system main pipe pressure cannot be effectively controlled.

[0006] For example, the invention patent with publication number CN114136088A discloses an energy-saving cooling water system for a high-power, large-tonnage metal melting furnace. By synchronously adjusting the internal circulation closed water cooling system and the external circulation open water cooling system, it solves the problem of only increasing or decreasing the cooling capacity but not significantly saving energy and reducing consumption.

[0007] In summary, the current closed cooling water system still has the following problems:

[0008] First, controlling the main pipe pressure by recirculation will increase the output of the closed cooling water pump and increase the power consumption of the closed cooling water pump.

[0009] Another point is that there is no backup for the recirculation adjustment valve. If the recirculation adjustment valve fails and needs to be repaired, the main pipe pressure of the closed cold water system cannot be adjusted. Summary of the Invention

[0010] The purpose of the present invention is to provide a closed cooling water system and a pressure regulating method thereof in order to overcome the defects of the above-mentioned prior art.

[0011] The purpose of the present invention can be achieved by the following technical solutions:

[0012] According to one aspect of the present invention, a closed cooling water system is provided, wherein the water pump comprises a cooling unit, a water pump main pipe and a pressure regulating unit;

[0013] The pressure regulating unit includes a closed cooling water pressure regulating bypass door 1, a closed cooling water pressure regulating door 3 and a recirculation adjustment door 6;

[0014] The closed cooling water pressure regulating valve 3 is set on the water pump main pipe to adjust the pressure of the water pump main pipe;

[0015] The recirculation adjustment door 6 is connected in parallel to both ends of the cooling unit to adjust the pressure of the cooling unit;

[0016] The closed cooling water pressure regulating bypass gate 1 is connected in parallel with the closed cooling water pressure regulating gate 3, and the recirculation adjustment gate 6 and the closed cooling water pressure regulating bypass gate 1 constitute a standby main pipe pressure regulating loop, which is used to adjust the water pump main pipe pressure in standby mode.

[0017] As an optimal technical solution, the water pump main pipe is also integrated with a closed cooling water pressure regulation manual isolation door 2 before and a closed cooling water pressure regulation manual isolation door 4 after. The closed cooling water pressure regulation door 3 is arranged between the closed cooling water pressure regulation manual isolation door 2 before and the closed cooling water pressure regulation manual isolation door 4 after.

[0018] As a preferred technical solution, the cooling unit includes a power unit and a heat exchange unit, and the power unit and the heat exchange unit are connected in series; wherein, the cooling unit is composed of multiple closed cooling water pumps 7 in parallel, and the heat exchange unit is composed of multiple closed cooling water heat exchangers 5 in parallel.

[0019] As an optimal technical solution, the closed cooling water pressure regulating bypass door 1 has the same diameter as the closed cooling water pressure regulating door 3, and a flow balancing orifice plate and a manual fine-tuning valve are provided on the standby main pipe pressure regulating circuit to ensure flow stability in the standby state.

[0020] As an optimal technical solution, the closed cooling water system also includes a control unit, which is electrically connected to the pressure regulating unit and adopts a fuzzy PID adaptive adjustment algorithm to dynamically adjust the PID parameters according to the pressure signals of various parts of the system fed back by the pressure regulating unit, and output a control signal to the pressure regulating unit.

[0021] As an optimal technical solution, the closed cooling water pressure regulating bypass door 1 adopts a butterfly valve structure, and the valve material is duplex stainless steel 2205; the closed cooling water pressure regulating bypass door 1 is equipped with an electric actuator to achieve remote control.

[0022] As an optimal technical solution, the closed cooling water pressure regulating door 3 adopts an electric proportional control valve with a built-in pressure sensor and flow sensor to collect the water pump main pipe pressure and flow signals in real time and feed them back to the control unit to achieve pressure-flow dual closed-loop regulation.

[0023] According to another aspect of the present invention, a closed cooling water system pressure regulation method is provided, the method including a normal pressure regulation mode and a standby pressure regulation mode:

[0024] In normal pressure regulation mode, the recirculation regulating valve 6 controls the pressure at the cooling unit, and the closed cooling water pressure regulating valve 3 controls the pressure at the main pipe, and the two work together to maintain system pressure stability.

[0025] The standby pressure regulation mode is: when the closed cooling water pressure regulating door 3 is abnormal, the closed cooling water pressure regulating bypass door 1 is opened first, and then the recirculation adjustment door 6 is switched to take over the main pipe pressure regulation task to ensure continuous operation of the system.

[0026] As a preferred technical solution, the closed cooling water pressure regulating door 3 adopts a segmented pressure compensation algorithm as the adjustment strategy, which specifically includes:

[0027] When the main pipe pressure is lower than the preset pressure, open the closed cooling water pressure regulating valve 3 at a rate of 2% increase for every 0.01MPa decrease in opening;

[0028] When the main pipe pressure is higher than the preset pressure, close the closed cooling water pressure regulating valve 3 at a ratio of 1.5% reduction in opening for every 0.01 MPa increase.

[0029] As a preferred technical solution, an interlocking control logic is provided between the closed cooling water pressure regulating bypass door 1 and the closed cooling water pressure regulating bypass door 3. Specifically, when the closed cooling water pressure regulating door 3 fails and cannot regulate the pressure normally, a fault signal is output, and the closed cooling water pressure regulating bypass door 1 automatically opens after receiving the fault signal, thereby ensuring the continuity of the system pressure regulation.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1. In the present invention, the pressure regulating unit includes a closed cooling water pressure regulating bypass door, a closed cooling water pressure regulating door and a recirculation adjustment door; wherein, the closed cooling water pressure regulating door is arranged on the water pump main pipe, and is used to regulate the pressure of the water pump main pipe; by arranging the closed cooling water pressure regulating door, the pressure of the water pump main pipe is regulated instead of the recirculation adjustment door, and the pressure regulation is switched from shunt pressure regulation to throttling pressure regulation, which reduces power consumption and meets energy-saving requirements. By precisely controlling the pressure, the problem of excessive water pump output and energy waste caused by opening the recirculation adjustment door for pressure regulation is avoided, thereby greatly reducing the power consumption of the cooling water pump.

[0032] 2. In the present invention, a closed cooling water pressure regulating bypass gate is also provided, which is connected in parallel with the closed cooling water pressure regulating gate. The recirculation adjustment gate and the closed cooling water pressure regulating bypass gate constitute a standby main pipe pressure regulating loop, which is used to adjust the water pump main pipe pressure in the standby state, increase the standby pressure regulating path, and can maintain the pressure stability of the closed cooling water system when one line is under maintenance, thereby improving the stability and safety of the overall system.

[0033] 3. In the present invention, the closed cooling water pressure regulating bypass door and the closed cooling water pressure regulating door have the same diameter. The consistent diameter ensures that the flow characteristics of the standby circuit match the main circuit, avoiding equipment impact caused by sudden flow changes, and a flow balancing orifice plate and a manual fine-tuning valve are provided on the standby main pipe pressure regulating circuit to ensure flow stability in the standby state.

[0034] 4. In the present invention, the closed cooling water system also includes a control unit, which is electrically connected to the pressure regulating unit and adopts a fuzzy PID adaptive adjustment algorithm to dynamically adjust the PID parameters according to the pressure signals of various parts of the system fed back by the pressure regulating unit, and output a control signal to the pressure regulating unit; and the closed cooling water pressure regulating bypass gate and the closed cooling water pressure regulating gate both automatically adjust the pressure according to real-time demand, ensuring that the system operates efficiently under different working conditions and improving the adaptability of the method.

[0035] 5. In the present invention, the method includes a normal pressure regulation mode and a standby pressure regulation mode. The normal pressure regulation mode is: the pressure at the cooling unit is controlled and regulated by the recirculation adjustment gate, and the pressure at the main pipe is controlled and regulated by the closed cooling water pressure regulation gate, and the two work together to maintain the system pressure stability; the standby pressure regulation mode is: when the closed cooling water pressure regulation gate is abnormal, the closed cooling water pressure regulation bypass gate is opened first, and then the recirculation adjustment gate is switched to take over the main pipe pressure regulation task to ensure continuous operation of the system; multi-path pressure regulation should be implemented to improve the dynamic adjustment capability of pressure.

[0036] 6. The closed cooling water pressure regulating valve regulation strategy uses a segmented pressure compensation algorithm, and interlocking control logic is provided between the closed cooling water pressure regulating bypass valve and the closed cooling water pressure regulating valve to ensure the continuity of system pressure regulation. This provides a stable pressure environment and reduces mechanical stress. A stable pressure environment can reduce fatigue wear of pipes, valves, and heat exchangers, extending their service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a schematic structural diagram of a closed cooling water system in the present invention;

[0038] Figure 2 Schematic diagram of the pressure regulation method of the closed cooling water system of the present invention under normal working conditions;

[0039] Figure 3Schematic diagram of the pressure regulation method of the closed cooling water system under abnormal conditions in the present invention;

[0040] In the figure, 1 is the closed cooling water pressure regulating bypass door, 2 is the manual isolation door before the closed cooling water pressure regulating, 3 is the closed cooling water pressure regulating door, 4 is the manual isolation door after the closed cooling water pressure regulating, 5 is the closed cooling water heat exchanger, 6 is the recirculation adjustment door, and 7 is the closed cooling water pump. DETAILED DESCRIPTION

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0042] Example 1

[0043] In this embodiment, taking the closed cooling water system of a certain factory as an example, the existing system consists of 2 closed cooling water pumps, 2 closed cooling water heat exchangers, 1 closed expansion water tank and heat exchangers of related users. The closed cooling water pump has a speed of 1480r / min and a head of 50m. A recirculation adjustment gate is provided between the outlet of the closed cooling water heat exchanger and the inlet of the closed cooling water pump, and the pressure of the closed cooling water main pipe is adjusted by the recirculation opening.

[0044] But the system:

[0045] (1) Controlling the main pipe pressure by recirculation will increase the output of the closed cooling water pump and increase the power consumption of the closed cooling water pump.

[0046] (2) There is no spare recirculation adjustment valve. If the recirculation adjustment valve fails and needs to be repaired, the main pipe pressure of the closed cold water system cannot be adjusted.

[0047] In this embodiment, a closed cooling water system is used to solve the above problems; the system is as follows Figure 1 As shown, the water pump includes a cooling unit, a water pump main pipe and a pressure regulating unit;

[0048] The pressure regulating unit includes a closed cooling water pressure regulating bypass door 1, a closed cooling water pressure regulating door 3 and a recirculation adjustment door 6;

[0049] The closed cooling water pressure regulating valve 3 is set on the water pump main pipe to adjust the pressure of the water pump main pipe;

[0050] The recirculation adjustment door 6 is connected in parallel to both ends of the cooling unit to adjust the pressure of the cooling unit;

[0051] The closed cooling water pressure regulating bypass gate 1 is connected in parallel with the closed cooling water pressure regulating gate 3, and the recirculation adjustment gate 6 and the closed cooling water pressure regulating bypass gate 1 constitute a standby main pipe pressure regulating loop, which is used to adjust the water pump main pipe pressure in standby mode.

[0052] The water pump main pipe is also integrated with a manual isolation door 2 before closed cooling water pressure regulation and a manual isolation door 4 after closed cooling water pressure regulation. The closed cooling water pressure regulating door 3 is arranged between the manual isolation door 2 before closed cooling water pressure regulation and the manual isolation door 4 after closed cooling water pressure regulation.

[0053] The cooling unit includes a power unit and a heat exchange unit, which are connected in series. The cooling unit is composed of multiple closed cooling water pumps 7 connected in parallel, and the heat exchange unit is composed of multiple closed cooling water heat exchangers 5 connected in parallel.

[0054] The closed cooling water pressure regulating bypass door 1 has the same diameter as the closed cooling water pressure regulating door 3, and a flow balancing orifice plate and a manual fine-tuning valve are provided on the standby main pipe pressure regulating circuit to ensure flow stability in the standby state.

[0055] The closed cooling water system also includes a control unit, which is electrically connected to the pressure regulating unit and adopts a fuzzy PID adaptive adjustment algorithm to dynamically adjust the PID parameters according to the pressure signals of various parts of the system fed back by the pressure regulating unit, and output a control signal to the pressure regulating unit.

[0056] The closed cooling water pressure regulating bypass door 1 adopts a butterfly valve structure, and the valve material is duplex stainless steel 2205; the closed cooling water pressure regulating bypass door 1 is equipped with an electric actuator to achieve remote control.

[0057] The closed cooling water pressure regulating door 3 adopts an electric proportional control valve with a built-in pressure sensor and flow sensor to collect the water pump main pipe pressure and flow signals in real time and feed them back to the control unit to achieve pressure-flow dual closed-loop regulation.

[0058] Example 2

[0059] In this embodiment, a closed cooling water system pressure regulation method is applied, which includes a normal pressure regulation mode and a standby pressure regulation mode:

[0060] In normal pressure regulation mode, the recirculation regulating valve 6 controls the pressure at the cooling unit, and the closed cooling water pressure regulating valve 3 controls the pressure at the main pipe, and the two work together to maintain system pressure stability.

[0061] The standby pressure regulation mode is: when the closed cooling water pressure regulating door 3 is abnormal, the closed cooling water pressure regulating bypass door 1 is opened first, and then the recirculation adjustment door 6 is switched to take over the main pipe pressure regulation task to ensure continuous operation of the system.

[0062] In this embodiment, the pressure regulation method of the closed cooling water system under normal working conditions is as follows: Figure 2 As shown, the pressure regulation method for closed cooling water system under abnormal working condition is as follows Figure 3 shown.

[0063] The regulation strategy of the closed cooling water pressure regulating door 3 adopts a segmented pressure compensation algorithm, which specifically includes:

[0064] When the main pipe pressure is lower than the preset pressure, open the closed cooling water pressure regulating valve 3 at a rate of 2% increase for every 0.01MPa decrease in opening;

[0065] When the main pipe pressure is higher than the preset pressure, close the closed cooling water pressure regulating valve 3 at a ratio of 1.5% reduction in opening for every 0.01 MPa increase.

[0066] An interlocking control logic is provided between the closed cooling water pressure regulating bypass door 1 and the closed cooling water pressure regulating bypass door 3. Specifically, when the closed cooling water pressure regulating bypass door 3 fails and cannot regulate the pressure normally, a fault signal is output, and the closed cooling water pressure regulating bypass door 1 automatically opens after receiving the fault signal, thereby ensuring the continuity of the system pressure regulation.

[0067] The specific implementation process is as follows:

[0068] (1) System structure construction

[0069] Core component deployment: A new closed cooling water system was constructed, encompassing the cooling unit, water pump header, and pressure regulating unit. The cooling unit consists of a power unit and a heat exchange unit connected in series. The power unit consists of two parallel closed cooling water pumps 7, and the heat exchange unit consists of two parallel closed cooling water heat exchangers 5, creating a redundant structure to ensure stable cooling supply.

[0070] Pressure regulation unit configuration: A manual isolation valve 2 before closed cooling water pressure regulation, a closed cooling water pressure regulation valve 3, and a manual isolation valve 4 after closed cooling water pressure regulation are installed on the water pump main pipe in this order. Pressure regulation valve 3 serves as the main pressure regulating component of the main pipe. Recirculation adjustment valve 6 is connected in parallel to both ends of the cooling unit and is responsible for regulating the cooling unit pressure. A closed cooling water pressure regulation bypass valve 1 is connected in parallel with pressure regulation valve 3 and, together with recirculation adjustment valve 6, forms a backup main pipe pressure regulation circuit. A flow balancing orifice plate and a manual fine-tuning valve are also installed in the backup main pipe pressure regulation circuit to ensure stable flow in standby mode.

[0071] Valve Selection and Optimization: Closed cooling water pressure regulating bypass valve 1 utilizes a butterfly valve structure made of duplex stainless steel 2205, which offers excellent corrosion resistance. It is equipped with an electric actuator, supports remote control, and seamlessly integrates with the factory's DCS system. Closed cooling water pressure regulating valve 3 utilizes an electric proportional control valve with built-in high-precision pressure and flow sensors, enabling real-time closed-loop pressure and flow monitoring and regulation.

[0072] (2) Intelligent control system integration

[0073] A control unit is introduced, utilizing a fuzzy PID adaptive control algorithm. Electrically connected to the pressure regulating unit, the control unit receives real-time pressure signals from the pressure regulating unit. Fuzzy logic rules dynamically adjust PID parameters, intelligently optimizing system pressure fluctuations for precise control.

[0074] (3) Implementation of voltage regulation method

[0075] Normal pressure regulation mode: During operation, the recirculation adjustment gate 6 prioritizes adjusting the cooling unit pressure and maintains the cooling unit pressure stable by changing the circulating water volume; the closed cooling water pressure regulating gate 3 simultaneously fine-tunes the main pipe pressure. The two work together to stably control the closed cooling water main pipe pressure within the range of 0.4MPa±0.02MPa.

[0076] Backup pressure regulation mode: When closed cooling water pressure regulating valve 3 experiences an anomaly (e.g., pressure regulation failure or sensor malfunction), the system triggers interlock control logic. Pressure regulating valve 3 outputs a fault signal, and closed cooling water pressure regulating bypass valve 1 automatically opens within 0.5 seconds. Recirculation regulating valve 6 then switches to operating mode, assuming the main pipe pressure regulation role, ensuring uninterrupted system pressure regulation and maintaining continuous and stable system operation.

[0077] Segmented pressure compensation regulation: A segmented pressure compensation algorithm is used for the closed cooling water pressure regulating valve 3. When the main pipe pressure is 0.4 MPa lower than the preset pressure, the pressure regulating valve 3 is rapidly opened, increasing the opening by 2% for every 0.01 MPa decrease, to achieve a rapid pressure recovery. When the main pipe pressure is higher than the preset pressure, the pressure regulating valve 3 is slowly closed, decreasing the opening by 1.5% for every 0.01 MPa increase, to avoid pressure overshoot and improve regulation accuracy and stability.

[0078] This solution greatly reduces water pump energy consumption and significantly improves reliability by optimizing the pressure regulation method. The application of a backup pressure regulation circuit and intelligent control strategy enables the system to automatically switch to backup mode when the pressure regulating valve fails, avoiding shutdown accidents caused by pressure loss.

[0079] The fuzzy PID adaptive adjustment algorithm is combined with the segmented pressure compensation strategy to reduce the main pipe pressure fluctuation range from the original ±0.05MPa to ±0.02MPa, optimize the adjustment accuracy, effectively meet the strict requirements of the factory's precision equipment for cooling water pressure stability, and reduce equipment failure rate.

[0080] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions are intended to be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A closed cooling water system, characterized in that: The water pump includes a cooling unit, a water pump main pipe and a pressure regulating unit; The pressure regulating unit comprises a closed cooling water pressure regulating bypass door (1), a closed cooling water pressure regulating door (3) and a recirculation adjustment door (6); The closed cooling water pressure regulating door (3) is arranged on the water pump main pipe and is used to regulate the pressure of the water pump main pipe; The recirculation adjustment door (6) is connected in parallel to both ends of the cooling unit and is used to adjust the pressure of the cooling unit; The closed cooling water pressure regulating bypass gate (1) is connected in parallel with the closed cooling water pressure regulating gate (3), and the recirculation adjustment gate (6) and the closed cooling water pressure regulating bypass gate (1) form a standby main pipe pressure regulating loop for regulating the water pump main pipe pressure in a standby state.

2. A closed cooling water system according to claim 1, characterized in that: The water pump main pipe is also integrated with a closed cooling water pressure regulating front manual isolation door (2) and a closed cooling water pressure regulating rear manual isolation door (4), and the closed cooling water pressure regulating door (3) is arranged between the closed cooling water pressure regulating front manual isolation door (2) and the closed cooling water pressure regulating rear manual isolation door (4).

3. A closed cooling water system according to claim 1, characterized in that: The cooling unit comprises a power unit and a heat exchange unit, wherein the power unit and the heat exchange unit are connected in series; wherein the cooling unit is composed of a plurality of closed cooling water pumps (7) connected in parallel, and the heat exchange unit is composed of a plurality of closed cooling water heat exchangers (5) connected in parallel.

4. A closed cooling water system according to claim 1, characterized in that: The closed cooling water pressure regulating bypass door (1) has the same diameter as the closed cooling water pressure regulating door (3), and a flow balancing orifice plate and a manual fine-tuning valve are provided on the standby main pipe pressure regulating circuit.

5. A closed cooling water system according to claim 1, characterized in that: The closed cooling water system also includes a control unit, which is electrically connected to the pressure regulating unit and adopts a fuzzy PID adaptive adjustment algorithm to dynamically adjust the PID parameters according to the pressure signals of various parts of the system fed back by the pressure regulating unit, and output a control signal to the pressure regulating unit.

6. A closed cooling water system according to claim 5, characterized in that: The closed cooling water pressure regulating bypass door (1) adopts a butterfly valve structure, and the valve material is duplex stainless steel 2205; the closed cooling water pressure regulating bypass door (1) is equipped with an electric actuator to achieve remote control.

7. A closed cooling water system according to claim 5, characterized in that: The closed cooling water pressure regulating door (3) adopts an electric proportional regulating valve and has a built-in pressure sensor and flow sensor to collect the water pump main pipe pressure and flow signals in real time and feed them back to the control unit to achieve pressure-flow dual closed-loop regulation.

8. A pressure regulating method for a closed cooling water system, characterized in that: The method is applied to a closed cooling water system as described in any one of claims 1 to 7, and the method includes a normal pressure regulation mode and a standby pressure regulation mode: The normal pressure regulation mode is: the recirculation regulating gate (6) controls and regulates the pressure at the cooling unit, and the closed cooling water pressure regulating gate (3) controls and regulates the pressure at the main pipe, and the two cooperate to maintain the system pressure stable; The standby pressure regulation mode is: when the closed cooling water pressure regulating door (3) is abnormal, the closed cooling water pressure regulating bypass door (1) is first opened, and then the recirculation adjustment door (6) is switched to take on the main pipe pressure regulation task to ensure continuous operation of the system.

9. The closed cooling water system pressure regulating method according to claim 8, characterized in that: The closed cooling water pressure regulating door (3) has a regulation strategy that adopts a segmented pressure compensation algorithm, specifically including: When the main pipe pressure is lower than the preset pressure, the closed cooling water pressure regulating valve (3) is opened at a rate of 2% increase for every 0.01 MPa decrease in pressure; When the main pipe pressure is higher than the preset pressure, the closed cooling water pressure regulating valve (3) is closed at a ratio of 1.5% reduction in opening for every 0.01 MPa increase.

10. The pressure regulating method for a closed cooling water system according to claim 8, characterized in that: An interlocking control logic is provided between the closed cooling water pressure regulating bypass door (1) and the closed cooling water pressure regulating door (3), specifically: when the closed cooling water pressure regulating door (3) fails and cannot regulate the pressure normally, a fault signal is output, and the closed cooling water pressure regulating bypass door (1) automatically opens after receiving the fault signal, thereby ensuring the continuity of the system pressure regulation.

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