Online oil stain detection and purging system and method for hydrogen refueling station

Abstract

The invention provides a hydrogen refueling station online oil stain detection purging system and method, 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 assembly and a hydrogen adding machine which are sequentially connected through a pipeline, the compressor receives hydrogen input, and the hydrogen adding machine adds hydrogen to a target object; a first detection assembly, an oil stain filter and a second detection assembly are sequentially arranged on a connecting pipeline of the compressor and the hydrogen storage assembly from one side of the compressor; the first detection assembly and the second detection assembly are both used for detecting oil contamination data of the positions where the first detection assembly and the second detection assembly are located and feeding back the oil contamination data to the central control unit. The greasy dirt filter is used for blocking greasy dirt and slowing down the speed of greasy dirt in the pipeline; the central control unit is used for controlling the start and stop of the compressor and the hydrogenation machine according to the received oil contamination data; the interlocking protection function of the hydrogen refueling station is effectively achieved, and oil stains are prevented from entering a vehicle-mounted 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 are the key link between hydrogen production and consumption, and their safe and efficient operation is crucial to the healthy development of the entire industry. However, in actual operation, the oil leakage problem of compressors at hydrogen refueling stations has gradually become a major bottleneck restricting the development of the industry. The compressor is one of the core equipment of the hydrogen refueling station, responsible for boosting hydrogen from low pressure to high pressure to meet the refueling needs of different models. However, due to design defects, improper maintenance or material aging, the compressor may leak lubricating oil during operation.

[0003] Oil leakage from the compressor will not only cause contamination of the hydrogen process pipeline, affecting the purity of hydrogen and thus reducing the efficiency of hydrogenation, but may also pollute the on-board hydrogen cylinder. Hydrogen cylinders are important components for storing hydrogen in hydrogen fuel cell vehicles. Once contaminated by oil, it will not only affect the storage performance of hydrogen, but may even cause safety hazards. In addition, oil may also enter the interior of the on-board fuel cell, destroying the internal structure of the battery, shortening the battery life, and increasing the economic burden on vehicle users.

[0004] In view of the severity of the above problems and their impact on the operation of hydrogen refueling stations and the interests of users, it is urgent to develop an effective technical solution to achieve real-time monitoring and early warning of oil pollution in the outlet gas of hydrogen refueling machines and compressors. Most of the existing hydrogen refueling stations lack a complete monitoring and early warning system and are unable to detect and deal with oil leakage problems in a timely manner, which undoubtedly increases the complexity of the problem and the difficulty of solving it. Therefore, establishing a technical system that can accurately identify oil pollution and take rapid measures to avoid the spread of pollution is of great significance to ensuring the safe and stable operation of hydrogen refueling stations, protecting user interests, and promoting the sustainable development of the hydrogen energy industry. Summary of the invention

[0005] Based on the current status of the background technology, the purpose of the present invention is to solve the problem that the existing hydrogenation station lacks oil leakage detection and interlocking control protection functions, and therefore proposes an online oil pollution detection and purging system for hydrogenation stations. The present invention utilizes the oil pollution molecules in the high-pressure gas to impact the detection component and gather, and then detects through the oil pollution detection sensor to achieve interlocking protection and prevent oil pollution from entering the vehicle-mounted gas cylinder; the present invention effectively improves the accuracy of oil pollution detection, and can use the stored high-pressure hydrogen to reversely discharge and 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 hydrogenation station, the system comprises a compressor, a hydrogen storage component and a hydrogenation machine which are sequentially connected through pipelines, the compressor receives hydrogen input, and the hydrogenation machine 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 the oil pollution data of their own positions, and feed the oil pollution data back to a central control unit; the oil pollution filter is used to block the oil pollution and slow down the speed of the oil pollution in the pipeline along the moving direction; the central control unit is used to control the start and stop of the compressor and the hydrogenation machine according to 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; both the first sensor and the second sensor are oil pollution detection sensors, which are used to detect oil pollution data in the pipeline at their own installation points; both the first sensor and the second sensor are communicatively connected to the central control unit.

[0009] Preferably, the first detection component and the second detection component are both U-shaped tubes, a first detection point is arranged 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 arranged 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 first detection component; the first relief valve has a corresponding relief port, and the first relief valve is communicatively connected with 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 with 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; the pressure sensor is communicatively connected 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.

[0014] Specifically, the pressure sensor, the first detection component and the second detection component are connected to the central control unit through the data acquisition unit and the data processing unit in sequence; 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 them 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 connects 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 the trigger condition.

[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 hydrogenation machine connected in sequence, an oil filter is provided between the connecting pipelines of the compressor and the hydrogen storage assembly;

[0017] S2. 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;

[0018] S3, using the central control unit to respectively obtain the oil pollution data corresponding to the first detection point and the second detection point, if the oil pollution data of the first detection point exceeds a preset first alarm threshold, the central control unit controls the compressor to stop and alarm externally;

[0019] S4. If the oil pollution data of the first detection point is normal, then determine the oil pollution data of the second detection point; if the oil pollution data of the second detection point exceeds the preset second alarm threshold, use the central control unit to obtain the pipeline gas density fed back by the hydrogenation machine; if the oil pollution data of the second detection point is normal, return to the first detection point and perform the next round of oil pollution data acquisition process;

[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] Further, 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 one 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 of the second relief valve;

[0022] The method also includes an independent oil self-purge process, in which the central control unit opens the first relief valve and the reverse valve of the hydrogen storage component at the same time, and uses the hydrogen in the hydrogen storage component to reversely purge the oil gas in the pipeline and release it through the first relief valve; according to a preset purge interval time value, the central control unit respectively obtains the oil data corresponding to the first detection point and the second detection point, and if any oil data exceeds the preset purge threshold, the oil self-purge process is performed, and the oil self-purge process is stopped after any oil data is lower than 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 and ensures the safety of the hydrogenation process through system structure design. At the same time, it has efficient reverse sewage discharge and purge capability, effectively preventing oil pollution from entering the vehicle-mounted gas cylinder and ensuring the normal operation of the vehicle fuel cell.

[0025] The present 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 will gather on the inner wall at the bottom of the tube under the action of impact force. This design allows the oil molecules to be concentrated, which is convenient for subsequent detection work. The presence of oil can be accurately detected by the oil detection sensor installed at the bottom of the U-shaped tube, thereby realizing real-time monitoring of oil pollution.

[0026] In order to further improve the detection accuracy, the present invention adds an oil filter between the two U-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 bottle unit to reversely 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 A schematic diagram of the structure and signal connection relationship of the system of the present invention;

[0028] Figure 2 It is a schematic diagram of the overall process of the method of the present invention. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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 here 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 claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are 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, which can be viewed simultaneously. First, the system includes a compressor, a hydrogen storage component and a hydrogen filling machine connected in sequence through pipelines. The compressor receives hydrogen input, and the hydrogen filling machine fills the target object with hydrogen. In this embodiment, the hydrogen storage component 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 positions and feed the oil pollution data back to the central control unit; the oil pollution filter is used to block the oil pollution and slow down the speed of the 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 according to 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 the present invention, both the first detection component and the second detection component are U-shaped tubes, a first detection point is arranged 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 arranged at the bottom of the U-shaped structure of the second detection component 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 realize the purging function, the system of this embodiment additionally adopts the following structural design: a first relief valve is also provided on 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 with 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 purging and release of the reverse gas in the pipeline, and the reverse gas source is provided by the hydrogen storage component, that is, the hydrogen bottle 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 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 connected to the central control unit in communication; 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. This structure realizes the function of directly releasing the oily gas in the pipeline after the compressor and the hydrogenator are started and stopped due to the influence of oil pollution data under the control of the central control unit.

[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 also provided on the connecting pipeline between the compressor and the first detection component, close to the compressor; the pressure sensor is connected to the central control unit for communication; the pressure sensor is used to detect the compressor outlet pressure value when the oily gas is released and feed it back to the central control unit. The compressor outlet pressure value will be used as the closing criterion of the second release valve.

[0041] This embodiment specifically introduces the part involving the central control unit. The pressure sensor, the first detection component and the second detection component are connected to the central control unit through the data acquisition unit and the data processing unit in sequence; the data acquisition unit is used to collect the pressure value and oil pollution data fed back by the connected components, and the data processing unit is used to pre-process the collected data and 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, which connects the compressor and the hydrogenation machine 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 the triggering condition.

[0042] In summary, this embodiment is based on the way that the oil molecules in the high-pressure hydrogen gas impact the wall of the U-shaped tube, which will gather a large number of oil molecules 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 vehicle-mounted gas cylinder. The process of adding an oil filter between the two U-shaped tubes can further improve the stage and accuracy of oil detection. The use of high-pressure hydrogen in the hydrogen storage component to reversely purge the pipeline and discharge sewage 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 the method is summarized as follows:

[0045] For a hydrogenation system consisting of a compressor, a hydrogen storage component and a hydrogenator connected in sequence, an oil filter is provided between the connecting pipelines of the compressor and the hydrogen storage component; 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 while detecting shutdown and the self-purging process of the entire system, this embodiment also connects a first release 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 release 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, and 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 judge the alarm trigger and control conditions according to the received oil pollution data. In the central control unit, a first alarm threshold and a second alarm threshold are preset, which correspond to the oil pollution data of the two detection points respectively.

[0050] If the oil pollution data of the first detection point exceeds the first alarm threshold, the central control unit sends a compressor shutdown signal, which is received by the central control PLC control system and controls the compressor to shut down. At the same time, when the alarm interlock unit gives an alarm signal, the central control PLC control system alarms externally. As a preferred embodiment here, the central control PLC control system can also shut down the hydrogenator for protection. In addition, when the first detection point alarms, the central control unit opens the second relief valve to release the oily gas in the pipeline.

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

[0052] 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, it means that there is "oil" in the hydrogenation machine pipeline. At this time, the hydrogenation machine shutdown valve is controlled, and the compressor is also shut down accordingly. At the same time, the central control PLC control system will alarm the outside under the action of the alarm interlock unit. The second relief valve is also opened at the same time to release the oily gas in the pipeline. If the pipeline gas density is less than the hydrogen density, the central control unit will control the compressor to shut down and alarm the outside, and also open the second relief valve at the same time to release the oily gas in the pipeline.

[0053] If the oil pollution data of the second detection point is normal, return to the first detection point to carry out the next round of oil pollution data acquisition process.

[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 oil pollution 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 of the second relief valve.

[0055] In this embodiment, based on the hardware structure foundation of the system and the logic of the method, the method may also include an independent oil self-purge process; the oil self-purge process may also be performed after the oil detection process is completed. During the oil self-purge process, the central control unit opens the first relief valve and simultaneously opens the reverse valve of the hydrogen storage component, i.e., the hydrogen bottle unit, and uses the hydrogen in the hydrogen storage component to reversely purge the oil 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 performed until any oil pollution data is lower than the purge threshold, and the oil pollution self-purge process will be stopped.

Claims

1. An online oil pollution detection and purging system for a hydrogenation station, the system comprising a compressor, a hydrogen storage component and a hydrogenation machine connected in sequence through pipelines, the compressor receiving hydrogen input, and the hydrogenation machine filling hydrogen for a target object; characterized in that: 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 arranged in sequence from one side of the compressor; the first detection component and the second detection component are both used to detect the oil pollution data at their own positions and feed the oil pollution data back to the central control unit; the oil pollution filter is used to block the oil pollution and slow down the speed of the 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 hydrogenation machine according to the received oil pollution data.

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

3. The online oil pollution detection and purging system for hydrogenation station according to claim 2 is characterized in that: The first detection component and the second detection component are both U-shaped tubes. 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.

4. The online oil pollution detection and purging system for hydrogenation station according to claim 3 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.

5. The online oil pollution detection and purging system for hydrogenation station according to claim 1 is characterized in that: A first relief valve is also provided on 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 with 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.

6. The online oil pollution detection and purging system for hydrogenation station according to claim 1 is characterized in that: 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 with 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.

7. The online oil pollution detection and purging system for hydrogenation station according to claim 6 is characterized by: A pressure sensor is also provided on the connecting pipeline between the compressor and the first detection component, close to the compressor; the pressure sensor is connected to the central control unit for communication; 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.

8. The online oil pollution detection and purging system for hydrogenation station according to claim 7 is characterized in that: The pressure sensor, the first detection component and the second detection component are connected to the central control unit through the data acquisition unit and the data processing unit in sequence; 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 them 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 connects 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 the trigger condition.

9. A method for detecting and purging oil pollution online at a hydrogenation station, characterized in that: The method comprises the following steps: S1. For a hydrogenation system consisting of a compressor, a hydrogen storage assembly and a hydrogenation machine connected in sequence, an oil filter is provided between the connecting pipelines of the compressor and the hydrogen storage assembly; S2. 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; S3, using the central control unit to respectively obtain the oil pollution data corresponding to the first detection point and the second detection point, if the oil pollution data of the first detection point exceeds a preset first alarm threshold, the central control unit controls the compressor to stop and alarm externally; S4. If the oil pollution data of the first detection point is normal, then determine the oil pollution data of the second detection point; if the oil pollution data of the second detection point exceeds the preset second alarm threshold, use the central control unit to obtain the pipeline gas density fed back by the hydrogenation machine; if the oil pollution data of the second detection point is normal, return to the first detection point and perform the next round of oil pollution data acquisition process; 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.

10. The method for detecting and purging oil pollution in an online hydrogenation station according to claim 9, 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 one 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 and release the oily gas in the pipeline while the compressor is shut down; 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 and release the oily gas in the pipeline while the hydrogenator and / or the compressor are shut down; when the second relief valve is opened and releases the oily gas in the pipeline, 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 of the second relief valve; The method also includes an independent oil self-purge process, in which the central control unit opens the first relief valve and the reverse valve of the hydrogen storage component at the same time, and uses the hydrogen in the hydrogen storage component to reversely purge the oil gas in the pipeline and release it through the first relief valve; according to a preset purge interval time value, the central control unit respectively obtains the oil data corresponding to the first detection point and the second detection point, and if any oil data exceeds the preset purge threshold, the oil self-purge process is performed, and the oil self-purge process is stopped after any oil data is lower than the purge threshold.

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