A high pressure liquid supply system

Abstract

The application provides a high-pressure liquid supply system, comprising a low-pressure pipeline module, a high-pressure pump module, a high-pressure pipeline module and a control module; the low-pressure pipeline module comprises a liquid inlet pipeline and a liquid return pipeline, the inlet of the liquid inlet pipeline and the outlet of the liquid return pipeline are connected to a liquid source, and the outlet of the liquid inlet pipeline is connected to the inlet of the high-pressure pump module; the outlet of the high-pressure pump module is connected to the high-pressure pipeline module, so that the high-pressure pump module is used for pressurizing the inflowing liquid; the high-pressure pipeline module comprises multiple loops, one of which is used for supplying liquid to a demand side, and the other loops are connected to the liquid return pipeline after being combined; and the control module is used for controlling the working states of the low-pressure pipeline module, the high-pressure pump module and the high-pressure pipeline module. The application can realize automatic supply of high-pressure n-nonane liquid, realize real-time monitoring of temperature, pressure control and flow data of n-nonane, and achieve unattended operation.

Description

Technical Field

[0001] This invention relates to the field of chemical technology, and more specifically to a high-pressure liquid supply system. Background Technology

[0002] Currently, there is no domestic technology to solve the problem of continuous automatic supply of high-pressure (greater than 400 bar) n-nonane. It is impossible to realize real-time monitoring of data such as temperature, pressure control and flow rate of high-pressure n-nonane in the high-pressure n-nonane supply system. In addition, n-nonane is flammable and explosive, and the equipment must meet the safety requirements of explosion-proof level.

[0003] Therefore, a high-pressure n-nonane supply system is needed to meet the above control requirements. Summary of the Invention

[0004] The purpose of this invention is to provide a high-pressure liquid supply system that can achieve automatic supply of high-pressure liquid.

[0005] To achieve the above objectives, the present invention provides a high-pressure liquid supply system, comprising:

[0006] Low-pressure pipeline module, high-pressure pump module, high-pressure pipeline module, and control module;

[0007] The low-pressure pipeline module includes an inlet pipeline and a return pipeline. The inlet of the inlet pipeline and the outlet of the return pipeline are connected to a liquid source, and the outlet of the inlet pipeline is connected to the inlet of the high-pressure pump module.

[0008] The outlet of the high-pressure pump module is connected to the high-pressure pipeline module, so the high-pressure pump module is used to pressurize the incoming liquid.

[0009] The high-pressure pipeline module includes multiple loops, one of which is used to supply liquid to the demand side, and the other loops are connected to the return pipeline.

[0010] The control module is used to control the operating status of the low-pressure pipeline module, the high-pressure pump module, and the high-pressure pipeline module.

[0011] In an optional embodiment, the inlet pipeline includes a pipeline body, and a first pneumatic switch valve, a first flow meter, a second pneumatic switch valve, and a remote pressure gauge, which are sequentially installed on the pipeline body along the inlet direction.

[0012] In an optional embodiment, a heat exchanger is also provided on the liquid inlet pipeline, and the heat exchanger is installed on the pipeline body between the first flow meter and the second pneumatic switch valve.

[0013] In an optional configuration, the heat exchanger is connected to a water supply pipeline and a water return pipeline, and the water return pipeline is equipped with a pneumatic regulating valve and a second flow meter.

[0014] In an optional configuration, the high-pressure pump module includes: a high-pressure pump, an oil tank, and a nitrogen pipeline;

[0015] The inlet of the high-pressure pump is connected to the outlet of the liquid inlet pipeline, and the outlet of the high-pressure pump is connected to the inlet of the high-pressure pipeline module.

[0016] The high-pressure pump is equipped with a temperature protection switch and a nitrogen pressure protection switch, which are used to alarm and stop the pump when the motor temperature exceeds a preset value, and to alarm when the nitrogen pressure in the compressor chamber of the high-pressure pump is lower than a set value.

[0017] The oil tank is equipped with a low liquid level switch and a high hydraulic pressure switch for early warning of liquid level.

[0018] One end of the nitrogen pipeline is connected to a nitrogen source, and the other end extends into the oil tank; an air inlet pipeline is provided between the oil tank and the high-pressure pump, through which nitrogen enters the compressor chamber of the high-pressure pump.

[0019] In an optional embodiment, the high-pressure pump module further includes an oil pump connected to the high-pressure pump to provide circulating lubricating oil to the high-pressure pump. The oil pump is equipped with an oil pressure sensor and an oil temperature sensor on its pipeline.

[0020] In an optional embodiment, the high-pressure pipeline module includes: a front-end foundation pipeline, which is connected to the outlet of the high-pressure pump module;

[0021] The front-end basic pipeline is sequentially equipped with a high-pressure sensor, a high-pressure pneumatic valve, a pulse tank, and a buffer tank along the liquid inlet direction.

[0022] The multiple circuits are the first circuit, the second circuit, the third circuit, the fourth circuit, and the fifth circuit installed at the outlet of the buffer tank;

[0023] The first circuit is equipped with a pressure relief valve; the second circuit is equipped with a second high-pressure manual regulating valve and a flow limiting valve; the third circuit is equipped with a fifth pneumatic switch valve, a second high-pressure fine manual regulating valve, and a fourth flow meter; the fourth circuit is equipped with a fourth pneumatic switch valve, a manual switch valve, a first high-pressure fine manual regulating valve, and a third flow meter; the fifth circuit is equipped with a third pneumatic switch valve and a first high-pressure manual regulating valve.

[0024] The fifth circuit is for demand-side liquid supply, and the first, second, third, and fourth circuits are connected to the return liquid pipeline after they merge.

[0025] In an optional embodiment, the low-pressure pipeline module includes a first bypass pipeline and a second bypass pipeline. One end of the first bypass pipeline is connected to the inlet of the liquid inlet pipeline and the outlet of the liquid return pipeline, and the other end of the first bypass pipeline is connected to the pipeline body between the first flow meter and the heat exchanger. The first bypass pipeline is provided with a first manual valve and a second manual valve, and the two ends of the second bypass pipeline are respectively connected to the first manual valve and the second manual valve.

[0026] In an optional embodiment, the control module includes: a host computer and a PLC controller connected by communication, wherein the host computer is equipped with monitoring software, and the PLC controller controls the low-pressure pipeline module, the high-pressure pump module, and the high-pressure pipeline module through an I / O interface.

[0027] In an optional configuration, a low-pressure pneumatic switch valve is provided on the nitrogen pipeline, and a safety valve is installed at the outlet of the high-pressure pump.

[0028] The beneficial effects of this invention are as follows:

[0029] This invention enables the automatic supply of high-pressure n-nonane liquid, real-time monitoring of data such as temperature, pressure and flow rate of n-nonane, and unattended operation. Attached Figure Description

[0030] The above and other objects, features and advantages of the present invention will become more apparent from the accompanying drawings, in which like reference numerals generally denote like parts.

[0031] Figure 1 This is a schematic diagram of a low-pressure pipeline module structure according to an embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram of a high-pressure pump module structure according to an embodiment of the present invention;

[0033] Figure 3 This is a schematic diagram of a high-pressure pipeline module structure according to an embodiment of the present invention;

[0034] Explanation of reference numerals in the attached figures:

[0035] 1-First pneumatic switch valve; 2-First flow meter; 3-Heat exchanger; 4-Pneumatic regulating valve; 5-Second flow meter; 6-Second pneumatic switch valve; 7-Remote pressure gauge; 81-High-pressure pump; 82-Oil pump; 83-Oil pressure sensor; 84-Oil temperature sensor; 85-Safety valve; 86-Temperature protection switch; 87-Pressure protection switch; 88-Low-pressure pneumatic switch valve; 89-Low level switch; 810-High level switch; 811-Inlet / outlet connecting hose; 9-Pressure sensor; 10-High-pressure pneumatic valve; 11-Pulse tank; 12-Buffer tank; 13-Temperature sensor; 14-Third pneumatic switch valve; 15-Fourth pneumatic switch valve; 16-Fifth pneumatic switch valve; 17-First high-pressure manual regulating valve; 18-Manual switch valve; 19-First high-pressure fine manual regulating valve; 20-Third flow meter; 21-Second high-pressure fine manual regulating valve; 22-Fourth flow meter; 23-Pressure relief valve; 24-Second high-pressure manual regulating valve; 25-Flow limiting valve. Detailed Implementation

[0036] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer from the following description and drawings. However, it should be noted that the concept of the technical solution of the present invention can be implemented in many different forms and is not limited to the specific embodiments described herein. The accompanying drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0037] It should be understood that when an element or layer is referred to as "on," "adjacent to," "connected to," or "coupled to" other elements or layers, it may be directly on, adjacent to, connected to, or coupled to other elements or layers, or there may be intervening elements or layers. Conversely, when an element is referred to as "directly on," "directly adjacent to," "directly connected to," or "directly coupled to" other elements or layers, there are no intervening elements or layers. It should be understood that although the terms first, second, third, etc., may be used to describe various elements, components, areas, layers, and / or portions, these elements, components, areas, layers, and / or portions should not be limited by these terms. These terms are only used to distinguish one element, component, area, layer, or portion from another element, component, area, layer, or portion. Therefore, without departing from the teachings of this invention, the first element, component, area, layer, or portion discussed below may be referred to as the second element, component, area, layer, or portion.

[0038] Spatial relation terms such as “below,” “under,” “below,” “under,” “above,” “above,” etc., are used herein for convenience of description to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms are intended to also include different orientations of the device in use and operation. For example, if the device in the figure is flipped, then the element or feature described as “below” or “under” the other element or feature will be oriented “above” the other element or feature. Therefore, the exemplary terms “below” and “under” can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or otherwise) and the spatial descriptive terms used herein will be interpreted accordingly.

[0039] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. When used herein, the singular forms “a,” “an,” and “the” are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising” and / or “including,” when used in this specification, identify the presence of the stated features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups. When used herein, the term “and / or” includes any and all combinations of the associated listed items.

[0040] Example 1

[0041] Reference Figures 1 to 3 This embodiment provides a liquid supply system, including:

[0042] Low-pressure pipeline module, high-pressure pump module, high-pressure pipeline module, and control module;

[0043] The low-pressure pipeline module includes an inlet pipeline and a return pipeline. The inlet of the inlet pipeline and the outlet of the return pipeline are connected to a liquid source, and the outlet of the inlet pipeline is connected to the inlet of the high-pressure pump module.

[0044] The outlet of the high-pressure pump module is connected to the high-pressure pipeline module, so the high-pressure pump module is used to pressurize the incoming liquid.

[0045] The high-pressure pipeline module includes multiple loops, one of which is used to supply liquid to the demand side, and the other loops are connected to the return pipeline.

[0046] The control module is used to control the operating status of the low-pressure pipeline module, the high-pressure pump module, and the high-pressure pipeline module.

[0047] Specifically, the high-pressure liquid supply system in this embodiment consists of a low-pressure pipeline module ( Figure 1 ), high-pressure pump module ( Figure 2 ), high-pressure pipeline module ( Figure 3 The system consists of a control module and a high-pressure nonane supply.

[0048] In this embodiment, the liquid inlet pipeline includes a pipeline body, and a first pneumatic switch valve 1, a first flow meter 2, a second pneumatic switch valve 6, and a remote pressure gauge 7 (for convenient remote viewing) installed sequentially on the pipeline body along the liquid inlet direction, as well as a local thermometer, pressure gauge, other valves, and pipelines.

[0049] In this embodiment, a heat exchanger 3 is also provided on the inlet pipeline, which is located on the main body of the pipeline between the first flow meter 2 and the second pneumatic switch valve 6. The heat exchanger 3 is a plate heat exchanger, sealed with fluororubber to avoid leakage risk. The heat exchanger is connected to a supply water pipeline and a return water pipeline, and a pneumatic regulating valve 4 and a second flow meter 5 are provided on the return water pipeline. The pneumatic regulating valve 4 facilitates the adjustment of the chilled water flow rate, thereby adjusting the temperature of the high-pressure n-nonane.

[0050] In this embodiment, the low-pressure pipeline module includes a first bypass pipeline and a second bypass pipeline. One end of the first bypass pipeline is connected to the inlet of the liquid inlet pipeline and the outlet of the liquid return pipeline, and the other end of the first bypass pipeline is connected to the main pipeline body between the first flow meter 2 and the heat exchanger 3. The first bypass pipeline is equipped with a first manual valve and a second manual valve, and both ends of the second bypass pipeline are connected to the first manual valve and the second manual valve, respectively. The first bypass pipeline and the second bypass pipeline facilitate system flushing or maintenance.

[0051] In this embodiment, the high-pressure pump module includes: a high-pressure pump 81, an oil tank, and a nitrogen pipeline; the inlet of the high-pressure pump 81 is connected to the outlet of the liquid inlet pipeline, the outlet of the high-pressure pump 81 is connected to the inlet of the high-pressure pipeline module, and a safety valve 85 is installed at the outlet of the high-pressure pump to release pressure through the safety valve 85 after overpressure; a temperature protection switch 86 and a nitrogen pressure protection switch 87 are installed on the high-pressure pump 81, which are used to alarm and stop the machine when the motor temperature of the high-pressure pump 81 exceeds a preset value, and to alarm when the nitrogen pressure in the compressor chamber of the high-pressure pump 81 is lower than a set value; the oil tank is equipped with a low liquid level switch 89 and a high hydraulic pressure switch 810 for warning of liquid level height; one end of the nitrogen pipeline is connected to a nitrogen source, and the other end extends into the oil tank. The nitrogen pipeline is equipped with a low-pressure pneumatic switch valve 88 (when the pressure inside the high-pressure pump is too low, the nitrogen pressure protection switch 87 alarms, and at the same time the low-pressure pneumatic switch valve 88 opens to supply nitrogen); an air inlet pipeline is provided between the oil tank and the high-pressure pump 81, and nitrogen enters the compressor chamber of the high-pressure pump 81 through the air inlet pipeline.

[0052] In this embodiment, the high-pressure pump module also includes an oil pump 82, which is connected to the high-pressure pump 81 and provides circulating lubricating oil to the high-pressure pump 81. The oil pump 82 is equipped with an oil pressure sensor 83 and an oil temperature sensor 84 on its pipeline to monitor the oil temperature and oil pressure in real time, and to trigger an alarm when the oil temperature or oil pressure is too high.

[0053] In this embodiment, the high-pressure pipeline module includes: a front-end basic pipeline connected to the outlet of the high-pressure pump module; a high-pressure sensor 9, a high-pressure pneumatic valve 10, a pulse tank 11, and a buffer tank 12 are sequentially arranged along the liquid inlet direction on the front-end basic pipeline; multiple loops are a first loop, a second loop, a third loop, a fourth loop, and a fifth loop located at the outlet of the buffer tank 12; a pressure relief valve 23 is provided on the first loop; a second high-pressure manual regulating valve 24 and a flow limiting valve 25 are provided on the second loop; a fifth pneumatic switch valve 16, a second high-pressure fine manual regulating valve 21, and a fourth flow meter 22 are provided on the third loop; a fourth pneumatic switch valve 15, a manual switch valve 18, a first high-pressure fine manual regulating valve 19, and a third flow meter 20 are provided on the fourth loop; a third pneumatic switch valve 14 and a first high-pressure manual regulating valve 17 are provided on the fifth loop; the fifth loop supplies liquid to the demand side, and the first, second, third, and fourth loops are connected to the return pipeline after merging.

[0054] The first circuit releases pressure via pressure relief valve 23 to prevent excessive system pressure. The second and third circuits are used to regulate the system bypass flow, but the second circuit limits the maximum bypass flow via flow restrictor valve 25. The second circuit is equipped with a fourth flow meter 22 to monitor the flow of the medium in real time. During system operation, the second high-pressure manual regulating valve 24 in the second circuit is open, and the fifth pneumatic switch valve 16 in the third circuit is open. The fourth circuit is also used to regulate the system bypass flow. During system operation, the fourth pneumatic switch valve 15 is closed. This valve is only opened when the system is shut down to quickly reduce the system pressure. The fifth circuit provides high-pressure n-nonane medium to the user side.

[0055] The working process of the above-mentioned high-pressure liquid supply system is as follows:

[0056] The low-pressure pipeline module is supplied with low pressure by the low-pressure system. After passing through the first pneumatic switch valve 1 and the first flow meter 2, it enters the heat exchanger 3 and exchanges heat with the chilled water from the water supply pipeline after passing through the pneumatic regulating valve 4 and the second flow meter 5. The low-pressure n-nonane cools down and the chilled water heats up. The cooled low-pressure n-nonane passes through the second pneumatic switch valve 6 and the remote pressure gauge 7, and then enters the high-pressure pump module. The remote pressure gauge 7 monitors the pressure of the n-nonane entering the high-pressure pump module in real time. In addition, when the system is running, the manual valve of the first bypass circuit is in the closed state and is opened when the system is flushed or under maintenance.

[0057] In the high-pressure pump module, nonane from low pressure is compressed and boosted to the required pressure by high-pressure pump 81. High-pressure pump 81 requires lubricating oil for operation. An oil pump 82 is installed in the system. The oil temperature and oil pressure in the oil pump pipeline are monitored in real time by oil pressure sensor 83 and oil temperature sensor 84. An alarm is triggered when the oil temperature or oil pressure is too high. A safety valve 85 is installed at the outlet of high-pressure pump 81 to release pressure after overpressure. A temperature protection switch 86 is installed on the motor of high-pressure pump 81. An alarm is triggered and the machine stops when the temperature is too high. High-pressure pump 81 requires nitrogen sealing protection during operation. An alarm is triggered when the nitrogen pressure protection switch 87 is too low. At the same time, the low-pressure pneumatic switch valve 88 opens to supply nitrogen. There is a possibility of nonane leakage when high-pressure pump 81 is operating. Therefore, an oil tank is installed in the system. The oil tank is equipped with a high liquid level switch 89 and a low liquid level switch 810. When the liquid level in the oil tank is low, an early warning is issued. When the liquid level is high, manual drainage is required. The high-pressure pump module is connected to the low-pressure pipeline module and the high-pressure pipeline module before and after via connecting hose 811.

[0058] In the high-pressure pipeline module, n-nonane is compressed and boosted to high pressure by high-pressure pump 81. Pressure sensor 9 monitors the outlet pressure of the high-pressure pump, and the system operates stably once the set pressure is reached (the set pressure is achieved by adjusting the speed of high-pressure pump 81). The high-pressure n-nonane enters buffer tank 12 via pulse tank 11. Temperature sensor 13 monitors the temperature of the high-pressure n-nonane. The high-pressure n-nonane exits buffer tank 12 and is divided into 5 paths. When the pressure inside buffer tank 12 is too high, the high-pressure n-nonane is depressurized through pressure relief valve 23 in the first loop (loop 1) and enters the return pipeline. The high-pressure n-nonane is used in the second loop (loop 2) to regulate the system bypass flow. After being depressurized by the second high-pressure manual regulating valve 24 and limited by the flow restricting valve 25, it enters the return pipeline. The second loop (loop 3) is used to regulate the system bypass flow. The high-pressure n-nonane enters the return pipeline via... The fifth pneumatic switch valve 16 and the second high-pressure fine manual regulating valve 21 are used for pressure relief. The fourth flow meter 22 monitors the flow and the liquid is fed into the return pipeline. When the system is running, the fifth pneumatic switch valve 16 is in the closed state. The fourth loop (loop 4) is also used to regulate the bypass flow of the system. High-pressure n-nonane is depressurized through the fourth pneumatic switch valve 15, the manual switch valve 18, and the first high-pressure fine manual regulating valve 19. The third flow meter 20 monitors the flow and the liquid is fed into the return pipeline. When the system is running, the fourth pneumatic switch valve 15 is in the closed state. The fifth loop (loop 5) provides high-pressure n-nonane medium to the user side. High-pressure n-nonane enters the demand side supply liquid through the third pneumatic switch valve 14 and the first high-pressure manual regulating valve 17. When loop 5 does not need to supply liquid, loops 1 to 4 form an internal circulation and operate normally.

[0059] The control module monitors field data through host computer software, and the running data is stored in the computer. The PLC controller is connected to the host computer via Ethernet through a switch. The PLC controller also connects to field devices such as high-pressure pumps, various pneumatic valves, temperature sensors, pressure sensors, level switches, pressure protection switches, and temperature protection switches through I / O modules to achieve real-time monitoring of data such as temperature, pressure control, and flow rate of high-pressure and low-pressure n-nonane.

[0060] The beneficial effects of this embodiment are as follows: ① The system pressure, temperature (the temperature of the high-pressure pipeline module temperature sensor 13 is set, and the temperature is adjusted by heat exchanger 3 in the low-pressure pipeline module with low-temperature chilled water; the chilled water flow rate is adjusted by pneumatic regulating valve 4; when the temperature in the high-pressure pipeline module changes, the pneumatic regulating valve 4 adjusts synchronously), and flow rate can be automatically adjusted according to demand, realizing real-time monitoring of data such as the temperature, pressure control, and flow rate of high-pressure n-nonane; ② Unattended operation: when the user side does not need liquid supply, the equipment can still operate through internal circulation, greatly reducing labor costs; ③ The equipment is explosion-proof, with a high safety system, meeting the different process requirements of different industries.

[0061] The above description is merely a description of preferred embodiments of the present invention and is not intended to limit the scope of the present invention in any way. Any changes or modifications made by those skilled in the art based on the above disclosure shall fall within the protection scope of the claims.

Claims

1. A high pressure liquid supply system, characterized by, include: Low-pressure pipeline module, high-pressure pump module, high-pressure pipeline module, and control module; The low-pressure pipeline module includes an inlet pipeline and a return pipeline. The inlet of the inlet pipeline and the outlet of the return pipeline are connected to a liquid source, and the outlet of the inlet pipeline is connected to the inlet of the high-pressure pump module. The outlet of the high-pressure pump module is connected to the high-pressure pipeline module, so the high-pressure pump module is used to pressurize the incoming liquid. The high-pressure pipeline module includes multiple loops, one of which is used to supply liquid to the demand side, and the other loops are connected to the return pipeline after merging. The control module is used to control the operating status of the low-pressure pipeline module, the high-pressure pump module, and the high-pressure pipeline module; The high-pressure pipeline module includes: a front-end foundation pipeline, which is connected to the outlet of the high-pressure pump module; The front-end basic pipeline is sequentially equipped with a high-pressure sensor, a high-pressure pneumatic valve, a pulse tank, and a buffer tank along the liquid inlet direction. The multiple circuits are the first circuit, the second circuit, the third circuit, the fourth circuit, and the fifth circuit installed at the outlet of the buffer tank; The first circuit is equipped with a pressure relief valve; the second circuit is equipped with a second high-pressure manual regulating valve and a flow limiting valve; the third circuit is equipped with a fifth pneumatic switch valve, a second high-pressure fine manual regulating valve, and a fourth flow meter; the fourth circuit is equipped with a fourth pneumatic switch valve, a manual switch valve, a first high-pressure fine manual regulating valve, and a third flow meter; the fifth circuit is equipped with a third pneumatic switch valve and a first high-pressure manual regulating valve. The fifth circuit is for demand-side liquid supply, and the first, second, third, and fourth circuits are connected to the return liquid pipeline after they merge.

2. The high-pressure liquid supply system of claim 1, wherein The liquid inlet pipeline includes a pipeline body, and a first pneumatic switch valve, a first flow meter, a second pneumatic switch valve, and a remote pressure gauge, which are sequentially installed on the pipeline body along the liquid inlet direction.

3. The high-pressure liquid supply system of claim 2, wherein A heat exchanger is also provided on the liquid inlet pipeline, and the heat exchanger is installed on the pipeline body between the first flow meter and the second pneumatic switch valve.

4. The high-pressure liquid supply system of claim 3, wherein The heat exchanger is connected to a water supply pipeline and a water return pipeline, and the water return pipeline is equipped with a pneumatic regulating valve and a second flow meter.

5. The high-pressure liquid supply system of claim 1, wherein The high-pressure pump module includes: a high-pressure pump, an oil tank, and a nitrogen pipeline; The inlet of the high-pressure pump is connected to the outlet of the liquid inlet pipeline, and the outlet of the high-pressure pump is connected to the inlet of the high-pressure pipeline module. The high-pressure pump is equipped with a temperature protection switch and a nitrogen pressure protection switch, which are used to alarm and stop the pump when the motor temperature exceeds a preset value, and to alarm when the nitrogen pressure in the compressor chamber of the high-pressure pump is lower than a set value. The oil tank is equipped with a low liquid level switch and a high hydraulic pressure switch for early warning of liquid level. One end of the nitrogen pipeline is connected to a nitrogen source, and the other end extends into the oil tank; an air inlet pipeline is provided between the oil tank and the high-pressure pump, through which nitrogen enters the compressor chamber of the high-pressure pump.

6. The high-pressure liquid supply system of claim 1, wherein The high-pressure pump module also includes an oil pump connected to the high-pressure pump to provide circulating lubricating oil to the high-pressure pump. The oil pump is equipped with an oil pressure sensor and an oil temperature sensor on its pipeline.

7. The high-pressure liquid supply system of claim 3, wherein The low-pressure pipeline module includes a first bypass pipeline and a second bypass pipeline. One end of the first bypass pipeline is connected to the inlet of the liquid inlet pipeline and the outlet of the liquid return pipeline. The other end of the first bypass pipeline is connected to the pipeline body between the first flow meter and the heat exchanger. The first bypass pipeline is provided with a first manual valve and a second manual valve. The two ends of the second bypass pipeline are respectively connected to the first manual valve and the second manual valve.

8. The high-pressure liquid supply system of claim 1, wherein The control module includes a host computer and a PLC controller connected by communication. The host computer is equipped with monitoring software, and the PLC controller controls the low-pressure pipeline module, the high-pressure pump module, and the high-pressure pipeline module through an I / O interface.

9. The high-pressure liquid supply system of claim 5, wherein The nitrogen pipeline is equipped with a low-pressure pneumatic switch valve, and the outlet of the high-pressure pump is equipped with a safety valve.

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