An online oil pollution detection and purge system and method for a hydrogenation station

Abstract

The present invention provides an online oil pollution detection and purging system and method for a hydrogen refueling station, which relates to the technical field of hydrogen refueling station equipment systems and solves the problem that a hydrogen refueling station lacks oil leakage detection and interlocking control protection functions; the system comprises a compressor, a hydrogen storage component and a hydrogenator which are connected in sequence through pipelines, the compressor receives hydrogen input, and the hydrogenator fills a target object with hydrogen; on the connecting pipeline between the compressor and the hydrogen storage component, a first detection component, an oil pollution filter and a second detection component are sequentially arranged from one side of the compressor; the first detection component and the second detection component are both used to detect oil pollution data at their own positions and feed the oil pollution data back to a central control unit; the oil pollution filter is used to block oil pollution and slow down the speed of oil pollution in the pipeline; the central control unit is used to control the start and stop of the compressor and the hydrogenator according to the received oil pollution data; the present invention effectively realizes the interlocking protection function of the hydrogen refueling station and prevents oil pollution from entering the on-board gas cylinder.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogenation station equipment systems, and in particular to an online oil pollution detection and purging system and method for a hydrogenation station. Background Art

[0002] In today's rapidly developing hydrogen economy, hydrogen refueling stations, as a critical link between hydrogen production and consumption, are crucial for the healthy development of the entire industry. However, in actual operation, oil leakage from compressors at hydrogen refueling stations has gradually become a major bottleneck restricting the industry's development. The compressor is a core piece of equipment at a hydrogen refueling station, responsible for boosting hydrogen from low pressure to high pressure to meet the refueling needs of different vehicle models. However, due to design flaws, improper maintenance, or aging materials, the compressor may leak lubricant during operation.

[0003] Compressor oil leakage not only contaminates hydrogen process pipelines, affecting hydrogen purity and reducing hydrogen refueling efficiency, but can also contaminate onboard hydrogen cylinders. Hydrogen cylinders are crucial components for hydrogen fuel cell vehicles, storing hydrogen. Once contaminated by oil, this not only affects hydrogen storage performance but can also pose safety risks. Furthermore, oil can enter the fuel cell itself, damaging its internal structure, shortening its lifespan and increasing the financial burden on vehicle owners.

[0004] Given the severity of the aforementioned issues and their impact on hydrogen station operations and user benefits, there is an urgent need to develop an effective technical solution to achieve real-time monitoring and early warning of oil contamination in the gas exiting hydrogenators and compressors. Most existing hydrogen stations lack comprehensive monitoring and early warning systems, making it impossible to detect and address oil leaks in a timely manner. This undoubtedly increases the complexity and difficulty of resolving the problem. Therefore, establishing a technical system that can accurately identify oil contamination and quickly take measures to prevent its spread is of great significance for ensuring the safe and stable operation of hydrogen stations, protecting user interests, and promoting the sustainable development of the hydrogen energy industry. Summary of the Invention

[0005] Based on the current state of the art, the present invention aims to address the problem of existing hydrogen refueling stations lacking oil leakage detection and interlocking control protection functions. Therefore, an online oil contamination detection and purging system for hydrogen refueling stations is proposed. The present invention utilizes oil contamination molecules in high-pressure gas to impact the detection component and aggregate, then detects them through an oil contamination detection sensor to achieve interlocking protection and prevent oil contamination from entering the vehicle's gas cylinder. The present invention effectively improves the accuracy of oil contamination detection and can use stored high-pressure hydrogen to reversely purge the pipeline.

[0006] The present invention adopts the following technical solutions to achieve the purpose:

[0007] An online oil pollution detection and purging system for a hydrogen refueling station, the system comprising a compressor, a hydrogen storage component and a hydrogenator connected in sequence through pipelines, the compressor receiving hydrogen input, and the hydrogenator filling a target object with hydrogen; a first detection component, an oil pollution filter and a second detection component are sequentially arranged on the connecting pipeline between the compressor and the hydrogen storage component, starting from one side of the compressor; the first detection component and the second detection component are both used to detect oil pollution data at their respective locations and feed the oil pollution data back to a central control unit; the oil pollution filter is used to block oil pollution and slow down the speed of oil pollution along the moving direction in the pipeline; the central control unit is used to control the start and stop of the compressor and the hydrogenator based on the received oil pollution data.

[0008] Specifically, a first sensor is installed at the first detection component, and a second sensor is installed at the second detection component; the first sensor and the second sensor are both oil pollution detection sensors, which are used to detect oil pollution data in the pipeline at their own installation points; the first sensor and the second sensor are both communicatively connected to the central control unit.

[0009] Preferably, the first detection component and the second detection component are both U-shaped tubes, and a first detection point is set at the bottom of the U-shaped structure of the first detection component corresponding to the U-shaped tube, and a second detection point is set at the bottom of the U-shaped structure of the second detection component corresponding to the U-shaped tube.

[0010] Specifically, the first sensor is installed at the location of the first detection point, and the second sensor is installed at the location of the second detection point.

[0011] Furthermore, a first relief valve is provided on the connecting pipeline between the compressor and the first detection component, close to the side of the first detection component; the first relief valve has a corresponding relief port, and the first relief valve is communicatively connected to the central control unit; the first relief valve is used to release the oily gas in the pipeline through the relief port under the control of the central control unit.

[0012] Furthermore, a second relief valve is provided on the connecting pipeline between the second detection component and the hydrogen storage component; the second relief valve has a corresponding relief port, and the second relief valve is communicatively connected to the central control unit; the second relief valve is used to release the oily gas in the pipeline through the relief port under the control of the central control unit.

[0013] Specifically, a pressure sensor is provided on the connecting pipeline between the compressor and the first detection component, close to the compressor side; the pressure sensor is communicatively connected to the central control unit; the pressure sensor is used to detect the compressor outlet pressure value and feed it back to the central control unit when the oily gas is released.

[0014] Specifically, the pressure sensor, the first detection component and the second detection component are connected to the central control unit in sequence through the data acquisition unit and the data processing unit; the data acquisition unit is used to collect the pressure values ​​and oil pollution data fed back by the connected components, and the data processing unit is used to pre-process the collected data and then input it into the central control unit; the control signal interface of the central control unit is connected to the central control PLC control system, and the central control PLC control system is connected to the compressor and the hydrogenator and controls the start and stop accordingly; the alarm signal interface of the central control unit is connected to the central control PLC control system through the alarm interlock unit, and the alarm interlock unit is used to transmit the alarm signal, so that the central control PLC control system can alarm externally under trigger conditions.

[0015] The present invention also provides an online oil pollution detection and purging method for a hydrogenation station, the method comprising the following steps:

[0016] S1. For a hydrogenation system consisting of a compressor, a hydrogen storage assembly, and a hydrogenator connected in sequence, an oil filter is installed between the connecting pipes of the compressor and the hydrogen storage assembly;

[0017] S2. Set a first detection point between the compressor and the oil filter, and set a second detection point between the oil filter and the hydrogen storage assembly;

[0018] S3. Using a central control unit to obtain oil pollution data corresponding to the first detection point and the second detection point, respectively. If the oil pollution data at the first detection point exceeds a preset first alarm threshold, the central control unit controls the compressor to stop and issues an alarm.

[0019] S4. If the oil contamination data at the first detection point is normal, the oil contamination data at the second detection point is then determined; if the oil contamination data at the second detection point exceeds a preset second alarm threshold, the central control unit is used to obtain the pipeline gas density fed back by the hydrogenation machine; if the oil contamination data at the second detection point is normal, the process returns to the first detection point and the next round of oil contamination data acquisition is performed;

[0020] S5. When the oil pollution data at the second detection point exceeds the preset second alarm threshold, if the pipeline gas density is greater than the hydrogen density, the central control unit controls the hydrogenation machine and the compressor to stop together and alarm to the outside; if the pipeline gas density is less than the hydrogen density, the central control unit controls the compressor to stop and alarm to the outside.

[0021] Furthermore, in step S2, a first relief valve and a pressure sensor are connected to the front end of the first detection point, the pressure sensor is connected to a position close to the side of the compressor, and a second relief valve is connected to the rear end of the second detection point; in step S3, if the oil pollution data of the first detection point exceeds the preset first alarm threshold, the central control unit controls the second relief valve to open while the compressor is shut down to release the oily gas in the pipeline; in step S5, when the oil pollution data of the second detection point exceeds the preset second alarm threshold, the central control unit controls the second relief valve to open while the hydrogenator and / or the compressor is shut down to release the oily gas in the pipeline; when the second relief valve is opened and the oily gas in the pipeline is released, the central control unit detects the compressor outlet pressure value through the pressure sensor, and uses the compressor outlet pressure value as the closing criterion for the second relief valve;

[0022] The method also includes an independent oil contamination self-purge process, in which the central control unit opens the first relief valve and simultaneously opens the reverse valve of the hydrogen storage assembly, using the hydrogen in the hydrogen storage assembly to reversely purge the oil contamination gas in the pipeline and release it through the first relief valve; based on a preset purge interval time value, the central control unit respectively obtains the oil contamination data corresponding to the first detection point and the second detection point, and if any oil contamination data exceeds a preset purge threshold, the oil contamination self-purge process is performed, and the oil contamination self-purge process is stopped when any oil contamination data falls below the purge threshold.

[0023] In summary, due to the adoption of this technical solution, the beneficial effects of the present invention are as follows:

[0024] The present invention improves the accuracy of oil pollution detection through system structure design, ensures the safety of the hydrogenation process, and at the same time has efficient reverse sewage purge capability, effectively preventing oil pollution from entering the vehicle gas cylinder, ensuring the normal operation of the vehicle fuel cell.

[0025] This invention utilizes the physical properties of oil molecules in high-pressure gas to design a corresponding detection component. When high-pressure gas containing oil flows through a U-shaped tube, the oil molecules accumulate on the inner wall of the tube bottom due to the impact force. This design concentrates the oil molecules, facilitating subsequent detection. The oil detection sensor installed at the bottom of the U-shaped tube can accurately detect the presence of oil, thereby enabling real-time monitoring of oil contamination.

[0026] In order to further improve the detection accuracy, the present invention adds an oil filter between the two U-shaped tubes. This component can not only intercept more oil molecules and reduce the possibility of them entering the downstream system, but also serve as the basis for secondary detection to ensure the reliability of the detection results. In addition, the reverse sewage purge part of the present invention can use the high-pressure hydrogen stored in the hydrogen cylinder unit to reverse purge the contaminated pipeline. In this way, not only can the oil in the pipeline be effectively removed and the clean state of the pipeline be restored, but the normal operation of the hydrogen refueling station can also be restored in the shortest possible time, reducing the economic losses caused by the shutdown. The oily gas released through the vent valve can be conveniently collected and processed in a unified manner, and the impact on the environment can also be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Schematic diagram of the structure and signal connection relationship of the system of the present invention;

[0028] Figure 2 Schematic diagram of the overall process of the method of the present invention. DETAILED DESCRIPTION

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0031] Example 1

[0032] An online oil pollution detection and purge system for hydrogenation stations. Figure 1 The structural connection relationship of the system is shown in Figure 1, which can be referenced simultaneously. First, the system includes a compressor, a hydrogen storage assembly, and a hydrogen refueling machine, which are sequentially connected by pipelines. The compressor receives hydrogen input, and the hydrogen refueling machine refuels the target object with hydrogen. In this embodiment, the hydrogen storage assembly can be a hydrogen cylinder unit, and the target object can be a vehicle-mounted gas cylinder.

[0033] As the key to online oil pollution detection, a first detection component, an oil pollution filter and a second detection component are arranged in sequence from one side of the compressor on the connecting pipeline between the compressor and the hydrogen storage component; the first detection component and the second detection component are both used to detect the oil pollution data at their own locations and feed the oil pollution data back to the central control unit; the oil pollution filter is used to block oil pollution and slow down the speed of oil pollution along the moving direction in the pipeline; the central control unit is used to control the start and stop of the compressor and hydrogenator based on the received oil pollution data.

[0034] In this embodiment, a first sensor is installed at the first detection component, and a second sensor is installed at the second detection component; the first sensor and the second sensor are both oil pollution detection sensors, which are used to detect oil pollution data in the pipeline at their own installation points; the first sensor and the second sensor are both communicatively connected to the central control unit.

[0035] As a preferred embodiment of this embodiment, both the first detection assembly and the second detection assembly are U-shaped tubes. A first detection point is provided at the bottom of the U-shaped structure of the first detection assembly corresponding to the U-shaped tube, and a second detection point is provided at the bottom of the U-shaped structure of the second detection assembly corresponding to the U-shaped tube. Therefore, the first sensor is installed at the location of the first detection point, and the second sensor is installed at the location of the second detection point.

[0036] In order to achieve the purge function, the system of this embodiment additionally adopts the following structural design: a first relief valve is further provided on the side of the connecting pipeline between the compressor and the first detection component close to the first detection component; the first relief valve has a corresponding relief port, and the first relief valve is communicatively connected to the central control unit; the first relief valve is used to release the oily gas in the pipeline through the relief port under the control of the central control unit.

[0037] The first relief valve can realize the purge and release of reverse gas in the pipeline, and the reverse gas source is provided by the hydrogen storage component, that is, the hydrogen cylinder unit. The entire reverse purge process can be carried out under the control of the central control unit.

[0038] In this embodiment, a second relief valve is further provided on the pipeline connecting the second detection assembly and the hydrogen storage assembly. The second relief valve has a corresponding relief port and is in communication with the central control unit. Under the control of the central control unit, the second relief valve is configured to release oily gas in the pipeline through the relief port. This structure enables the central control unit to directly release oily gas in the pipeline after the compressor and hydrogenator are started or stopped due to oil contamination data.

[0039] In this embodiment, both the first relief valve and the second relief valve can be pneumatic relief valves.

[0040] In this embodiment, a pressure sensor is installed on the connecting pipe between the compressor and the first detection assembly, near the compressor. The pressure sensor is in communication with the central control unit. The pressure sensor is used to detect the compressor outlet pressure during the release of oily gas and provide feedback to the central control unit. The compressor outlet pressure serves as the criterion for closing the second relief valve.

[0041] This embodiment specifically describes the portion involving the central control unit. The pressure sensor, the first detection component, and the second detection component are all connected to the central control unit via a data acquisition unit and a data processing unit. The data acquisition unit is used to collect pressure values ​​and oil pollution data fed back by the connected components, and the data processing unit is used to pre-process the collected data before inputting it into the central control unit. The control signal interface of the central control unit is connected to the central control PLC control system, which connects to the compressor and hydrogenation machine and controls their start and stop accordingly. The alarm signal interface of the central control unit is connected to the central control PLC control system via an alarm interlock unit. The alarm interlock unit is used to transmit alarm signals, allowing the central control PLC control system to issue an external alarm under triggering conditions.

[0042] In summary, this embodiment is based on the way that oil molecules in high-pressure hydrogen impact the wall of the U-shaped tube, which will cause a large number of oil molecules to accumulate at the bottom of the U-shaped structure. After detection by the oil detection sensor, interlock protection is implemented to prevent oil from entering the on-board gas cylinder. The process of adding an oil filter between the two U-shaped tubes can further improve the stage-by-stage and accuracy of oil detection. The use of high-pressure hydrogen in the hydrogen storage component to reversely purge the pipeline and discharge pollutants can also better ensure the stability and reliability of the system when the hydrogenation system is on standby.

[0043] Example 2

[0044] Based on Example 1, this example provides an online oil pollution detection and purging method for a hydrogenation station. In this example, the system described in Example 1 can be used as the hardware basis. Figure 2 The overall process of this method is summarized as follows:

[0045] For a hydrogenation system consisting of a compressor, a hydrogen storage assembly and a hydrogenator connected in sequence, an oil filter is provided between the connecting pipelines of the compressor and the hydrogen storage assembly; the oil filter can slow down the speed at which oil enters the rear-end pipeline.

[0046] A first detection point is set between the compressor and the oil filter, and a second detection point is set between the oil filter and the hydrogen storage assembly; the two detection points correspond to two U-shaped tubes and their oil detection sensors.

[0047] In order to realize the release of oily gas at the same time as the shutdown detection, as well as the self-purging process of the entire system, this embodiment also connects a first relief valve and a pressure sensor at the front end of the first detection point, the pressure sensor is connected to a position close to the compressor side, and a second relief valve is connected at the rear end of the second detection point.

[0048] After the system is powered on for detection, the data acquisition unit collects the oil pollution data of the first detection point and the second detection point respectively. The collected oil pollution data is sent to the data processing unit. After the data processing unit completes the preprocessing and analysis, it sends the results to the central control unit.

[0049] The central control unit will analyze and determine the alarm trigger and control conditions based on the received oil pollution data. In the central control unit, a first alarm threshold and a second alarm threshold are preset, corresponding to the oil pollution data of the two detection points respectively.

[0050] If the oil contamination data at the first detection point exceeds the first alarm threshold, the central control unit issues a compressor shutdown signal, which is received by the central PLC control system and controls the compressor shutdown. Simultaneously, if the alarm interlock unit issues an alarm signal, the central PLC control system also issues an external alarm. As a preferred option, the central PLC control system can also simultaneously shut down the hydrogenation machine for protection. Furthermore, when the first detection point alarm sounds, the central control unit opens the second relief valve to release the oily gas in the pipeline.

[0051] If the oil contamination data at the first detection point is normal, the oil contamination data at the second detection point is then determined. If the oil contamination data at the second detection point exceeds a preset second alarm threshold, the central control unit is used to obtain the pipeline gas density fed back by the hydrogenation machine.

[0052] If the oil contamination data at the second detection point exceeds the preset second alarm threshold, and the pipeline gas density is greater than the hydrogen density, it indicates that there is "oil" in the hydrogenation machine pipeline. At this time, the hydrogenation machine shuts down the valve, the compressor also shuts down accordingly, and the central control PLC control system, under the action of the alarm interlock unit, triggers an external alarm. The second relief valve also opens simultaneously to release the oily gas in the pipeline. If the pipeline gas density is less than the hydrogen density, the central control unit controls the compressor to shut down and trigger an external alarm, and simultaneously opens the second relief valve to release the oily gas in the pipeline.

[0053] If the oil pollution data of the second detection point is normal, the process returns to the first detection point and proceeds to the next round of oil pollution data acquisition.

[0054] For the compressor and / or hydrogenator, when it is shut down due to oil pollution detection, the second relief valve will open and release the oily gas in the pipeline; in this case, the central control unit detects the compressor outlet pressure value through the pressure sensor and uses the compressor outlet pressure value as the closing criterion for the second relief valve.

[0055] In this embodiment, based on the system's hardware architecture and method logic, the method may also include an independent oil contamination self-purge process; this process can also be performed after the oil contamination detection process is complete. During the oil contamination self-purge process, the central control unit opens the first relief valve and simultaneously opens the reverse valve of the hydrogen storage assembly, i.e., the hydrogen cylinder unit. The hydrogen in the hydrogen storage assembly is used to reversely purge the oil contamination gas in the pipeline and release it through the first relief valve.

[0056] When the system is in standby mode, the central control unit can obtain the oil pollution data corresponding to the first detection point and the second detection point respectively according to the preset purge interval time value. If any oil pollution data exceeds the preset purge threshold, the oil pollution self-purge process will be carried out until any oil pollution data falls below the purge threshold, at which time the oil pollution self-purge process will be stopped.

Claims

1. An online oil pollution detection and purge system for a hydrogenation station, comprising a compressor, a hydrogen storage assembly, and a hydrogenation machine connected in sequence by pipelines, wherein the compressor receives hydrogen input and the hydrogenation machine fills the target object with hydrogen; characterized in that: On the connecting pipeline between the compressor and the hydrogen storage assembly, a first detection assembly, an oil filter, and a second detection assembly are sequentially arranged from one side of the compressor; the first detection assembly and the second detection assembly are each used to detect oil pollution data at their respective locations and feed the oil pollution data back to the central control unit; the oil pollution filter is used to block oil pollution and slow down the speed of oil pollution in the direction of movement in the pipeline; the central control unit is used to control the start and stop of the compressor and the hydrogenator based on the received oil pollution data; The first detection component and the second detection component are both U-shaped tubes, a first detection point is provided at the bottom of the U-shaped structure of the first detection component corresponding to the U-shaped tube, and a second detection point is provided at the bottom of the U-shaped structure of the second detection component corresponding to the U-shaped tube; A first relief valve is further provided on a side of the connecting pipeline between the compressor and the first detection assembly, close to the first detection assembly; the first relief valve has a corresponding relief port, and the first relief valve is communicatively connected to the central control unit; the first relief valve is used to, under the control of the central control unit, provide a reverse gas source from the hydrogen storage assembly to achieve purging and dispersing of reverse gas in the pipeline, thereby dispersing the oily gas in the pipeline through its corresponding relief port; A second relief valve is also provided on the connecting pipeline between the second detection component and the hydrogen storage component; the second relief valve has a corresponding relief port, and the second relief valve is communicatively connected to the central control unit; the second relief valve is used to release the oily gas in the pipeline through its corresponding relief port under the control of the central control unit.

2. The online oil pollution detection and purging system for hydrogenation stations according to claim 1, characterized in that: A first sensor is installed at the first detection component, and a second sensor is installed at the second detection component; the first sensor and the second sensor are both oil pollution detection sensors, which are used to detect oil pollution data in the pipeline at their own installation points; the first sensor and the second sensor are both communicatively connected to the central control unit.

3. The online oil pollution detection and purging system for hydrogenation stations according to claim 2 is characterized in that: The first sensor is installed at the location of the first detection point, and the second sensor is installed at the location of the second detection point.

4. The online oil pollution detection and purging system for hydrogenation stations according to claim 1, characterized in that: A pressure sensor is also provided on the connecting pipeline between the compressor and the first detection component, close to the compressor side; the pressure sensor is communicated with the central control unit; the pressure sensor is used to detect the compressor outlet pressure value and feed it back to the central control unit when the oily gas is released.

5. The online oil pollution detection and purging system for hydrogenation stations according to claim 4 is characterized in that: The pressure sensor, the first detection component and the second detection component are connected to the central control unit in sequence through the data acquisition unit and the data processing unit; the data acquisition unit is used to collect the pressure values ​​and oil pollution data fed back by the connected components, and the data processing unit is used to pre-process the collected data and then input it into the central control unit; the control signal interface of the central control unit is connected to the central control PLC control system, and the central control PLC control system is connected to the compressor and the hydrogenator and controls the start and stop accordingly; the alarm signal interface of the central control unit is connected to the central control PLC control system through the alarm interlock unit, and the alarm interlock unit is used to transmit the alarm signal, so that the central control PLC control system can alarm externally under trigger conditions.

6. An oil pollution detection and purging method for an online oil pollution detection and purging system for a hydrogenation station according to any one of claims 1 to 5, characterized in that: The method comprises the following steps: S1. For a hydrogenation system consisting of a compressor, a hydrogen storage assembly, and a hydrogenator connected in sequence, an oil filter is installed between the connecting pipes of the compressor and the hydrogen storage assembly; S2. Set a first detection point between the compressor and the oil filter, and set a second detection point between the oil filter and the hydrogen storage assembly; S3. Using a central control unit to obtain oil pollution data corresponding to the first detection point and the second detection point, respectively. If the oil pollution data at the first detection point exceeds a preset first alarm threshold, the central control unit controls the compressor to stop and issues an alarm. S4. If the oil contamination data at the first detection point is normal, the oil contamination data at the second detection point is then determined; if the oil contamination data at the second detection point exceeds a preset second alarm threshold, the central control unit is used to obtain the pipeline gas density fed back by the hydrogenation machine; if the oil contamination data at the second detection point is normal, the process returns to the first detection point and the next round of oil contamination data acquisition is performed; S5. When the oil pollution data at the second detection point exceeds the preset second alarm threshold, if the pipeline gas density is greater than the hydrogen density, the central control unit controls the hydrogenation machine and the compressor to stop together and alarm to the outside; if the pipeline gas density is less than the hydrogen density, the central control unit controls the compressor to stop and alarm to the outside.

7. The oil pollution detection and purging method according to claim 6, characterized in that: In step S2, a first relief valve and a pressure sensor are connected to the front end of the first detection point, the pressure sensor is connected to a position close to the side of the compressor, and a second relief valve is connected to the rear end of the second detection point; in step S3, if the oil pollution data at the first detection point exceeds a preset first alarm threshold, the central control unit controls the second relief valve to open while the compressor is shut down to release the oily gas in the pipeline; in step S5, when the oil pollution data at the second detection point exceeds a preset second alarm threshold, the central control unit controls the second relief valve to open while the hydrogenator and / or the compressor is shut down to release the oily gas in the pipeline; when the second relief valve is opened and the oily gas in the pipeline is released, the central control unit detects the compressor outlet pressure value through the pressure sensor, and uses the compressor outlet pressure value as the closing criterion for the second relief valve; The method also includes an independent oil contamination self-purge process, in which the central control unit opens the first relief valve and simultaneously opens the reverse valve of the hydrogen storage assembly, using the hydrogen in the hydrogen storage assembly to reversely purge the oil contamination gas in the pipeline and release it through the first relief valve; based on a preset purge interval time value, the central control unit respectively obtains the oil contamination data corresponding to the first detection point and the second detection point, and if any oil contamination data exceeds a preset purge threshold, the oil contamination self-purge process is performed, and the oil contamination self-purge process is stopped when any oil contamination data falls below the purge threshold.

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