阅读说明：本技术 一种安全可靠的多功能氢气卸放系统 (Safe and reliable's multi-functional hydrogen discharge system ) 是由 周伟 吕洪 张家朋 于 2020-06-18 设计创作，主要内容包括：本发明公开了一种安全可靠的多功能氢气卸放系统,包括箱体模块及设置于箱体模块内的管路单元和电路单元,其中管路单元包括氢气卸放管路、氢气置换管路和氮气置换及测试管路；电路单元中氢浓度探测器、火焰探测器、强制排风系统、声光报警器、计量显示器和PLC控制系统均设置于箱体模块内且该氢浓度探测器、火焰探测器、强制排风系统、声光报警器和计量显示器分别通过线路与PLC控制系统电性连接,所述紧急切断电磁阀、质量流量计和压力传感器分别通过线路与PLC控制系统电性连接。本发明结构设计合理且使用安全可靠。(The invention discloses a safe and reliable multifunctional hydrogen discharging system, which comprises a box body module, and a pipeline unit and a circuit unit which are arranged in the box body module, wherein the pipeline unit comprises a hydrogen discharging pipeline, a hydrogen replacing pipeline and a nitrogen replacing and testing pipeline; the hydrogen concentration detector, the flame detector, the forced air exhaust system, the audible and visual alarm, the metering display and the PLC control system in the circuit unit are all arranged in the box body module, the hydrogen concentration detector, the flame detector, the forced air exhaust system, the audible and visual alarm and the metering display are respectively electrically connected with the PLC control system through circuits, and the emergency cut-off solenoid valve, the mass flow meter and the pressure sensor are respectively electrically connected with the PLC control system through circuits. The invention has reasonable structural design and safe and reliable use.)

1. A safe and reliable multifunctional hydrogen discharge system is characterized by comprising a box body module, and a pipeline unit and a circuit unit which are arranged in the box body module, wherein the pipeline unit comprises a hydrogen discharge pipeline, a hydrogen replacement pipeline and a nitrogen replacement and test pipeline; the hydrogen unloading pipeline is sequentially provided with a CGA1350 joint, a connecting hose I, a pulling-off device, an electrostatic grounding alarm, a filter I, an emergency cut-off electromagnetic valve, a mass flow meter, a high-pressure ball valve V, a human body electrostatic discharge alarm, a one-way valve I and a hydrogen output interface along the gas conveying direction, the gas input end of the hydrogen unloading pipeline is connected with the hydrogen unloading joint of a hydrogen long pipe trailer through the CGA1350 joint, the hydrogen unloading pipeline between the mass flow meter and the high-pressure ball valve V is sequentially connected with a gas emptying pipeline and a gas pressure measuring pipeline along the gas conveying direction, the gas emptying pipeline is sequentially provided with an emptying ball valve, an emptying needle valve, a backfire preventer and a gas emptying interface along the gas conveying direction, and the gas pressure measuring pipeline is connected with a pressure gauge and a pressure sensor which are connected in parallel with each other through the; a hydrogen steel cylinder joint, a connecting hose II, a one-way valve II, a filter II and a high-pressure ball valve II are sequentially arranged on the hydrogen replacement pipeline along the gas conveying direction, the gas input end of the hydrogen replacement pipeline is connected with a hydrogen steel cylinder in a hydrogen container lattice through the hydrogen steel cylinder joint, and the gas output end of the hydrogen replacement pipeline is connected with a hydrogen discharge pipeline between the electrostatic grounding alarm and the filter I; the nitrogen displacement and test pipeline is sequentially provided with a nitrogen steel cylinder joint, a connecting hose III and a one-way valve III along the gas conveying direction, the gas input end of the nitrogen displacement and test pipeline is connected with a nitrogen steel cylinder in the nitrogen container grid through the nitrogen steel cylinder joint, and the gas output end of the nitrogen displacement and test pipeline is connected with the hydrogen displacement pipeline between the one-way valve II and the filter II; the hydrogen concentration detector, the flame detector, the forced air exhaust system, the audible and visual alarm, the metering display and the PLC control system in the circuit unit are all arranged in the box body module, the hydrogen concentration detector, the flame detector, the forced air exhaust system, the audible and visual alarm and the metering display are respectively electrically connected with the PLC control system through circuits, and the emergency cut-off solenoid valve, the mass flow meter and the pressure sensor are respectively electrically connected with the PLC control system through circuits.

2. The safe and reliable multifunctional hydrogen discharge system according to claim 1, characterized in that: and a hydrogen bypass connecting pipeline is arranged on the hydrogen discharge pipeline between the mass flow meter and the high-pressure ball valve V, a high-pressure ball valve I and a safety valve I are sequentially arranged on the hydrogen bypass connecting pipeline along the gas conveying direction, and the gas output end of the hydrogen bypass connecting pipeline is connected with a gas discharge pipeline between the evacuation needle valve and the backfire preventer.

3. The safe and reliable multifunctional hydrogen discharge system according to claim 1, characterized in that: and a nitrogen replacement and test pipeline between the one-way valve III and the one-way valve II is provided with a nitrogen bypass connecting pipeline, a high-pressure ball valve III and a safety valve II are sequentially arranged on the nitrogen bypass connecting pipeline along the gas conveying direction, and the gas output end of the nitrogen bypass connecting pipeline is connected with a gas emptying pipeline between an emptying needle valve and a backfire preventer.

4. The safe and reliable multifunctional hydrogen discharge system according to claim 1, characterized in that: the hydrogen that filter I and promptly cut off between the solenoid valve unloads and is equipped with hydrogen sampling pipeline on the pipeline, this hydrogen sampling pipeline goes up to be equipped with coupling hose IV and high-pressure needle valve along gas conveying direction in proper order, and the gas input end of hydrogen sampling pipeline is equipped with hydrogen sample connection, and this hydrogen sample connection hydrogen sampling bottle for through hydrogen sampling bottle to hydrogen on the hydrogen long tube trailer sample and carry out chemical examination to the hydrogen in the hydrogen sampling bottle.

5. A method for operating a safe and reliable multifunctional hydrogen discharge system according to any one of claims 1 to 4, which is characterized by comprising the following steps:

step S1: the hydrogen long pipe trailer, the hydrogen packaging grid and the nitrogen packaging grid are respectively installed in place, and the system is powered on;

step S2: the operator touches the human body electrostatic discharge alarm until the voice prompts that the electrostatic discharge is finished;

step S3: connecting the electrostatic grounding alarm with a hydrogen long-tube trailer, and performing electrostatic discharge on the hydrogen long-tube trailer;

step S4: opening a nitrogen packaging grid with a switch, an emergency cut-off electromagnetic valve and a high-pressure ball valve II, closing the high-pressure ball valve II after a pressure gauge is stabilized to 5MPa, opening an emptying ball valve and an emptying needle valve until the pressure gauge is stabilized to 0.2MPa, and then closing the emptying ball valve and the emptying needle valve;

step S5: opening the high-pressure ball valve II until the pressure gauge is stabilized to 5MPa, closing the high-pressure ball valve II, opening the emptying ball valve and the emptying needle valve until the pressure gauge is stabilized to 0.2MPa, and then closing the emptying ball valve and the emptying needle valve;

step S6: step S5, circulating operation is carried out for 5 times, after nitrogen replacement is finished, the nitrogen container grid with the switch and the high-pressure ball valve II is closed;

step S7: opening a hydrogen packaging grid with a switch, an emergency cut-off electromagnetic valve and a high-pressure ball valve II, closing the high-pressure ball valve II after a pressure gauge is stabilized to 5MPa, opening an emptying ball valve and an emptying needle valve until the pressure gauge is stabilized to 0.2MPa, and then closing the emptying ball valve and the emptying needle valve;

step S8: step S5, circulating operation is carried out for 5 times, after hydrogen replacement is finished, the hydrogen container grid with the switch and the high-pressure ball valve II is closed;

step S9: and opening the hydrogen long pipe trailer, and providing hydrogen for the downstream by switching on the hydrogen long pipe trailer, and cutting off the electromagnetic valve and the high-pressure ball valve V in an emergency way.

Technical Field

The invention belongs to the technical field of hydrogen discharging systems of hydrogen filling stations, and particularly relates to a safe and reliable multifunctional hydrogen discharging system.

Background

China is a large industrial country and is also the country with the most reserved quantity of global motor vehicles, and a large amount of greenhouse gas generated in industrial production and transportation is not beneficial to the goal of reducing carbon emission promised by China to the world, so the development of the countries on clean energy is more and more important in recent years. With the development of science and technology, the emergence of hydrogen fuel cell automobiles is beneficial to the national fundamental reduction of continuously increased carbon emission. The core power of a hydrogen fuel cell automobile is a hydrogen fuel cell, which is a power generation device that directly converts chemical energy of hydrogen and oxygen in the air into electric energy.

At present, hydrogen required by a hydrogen fuel cell automobile is mainly obtained from a hydrogen filling station, hydrogen in the main hydrogen filling station is provided by an external hydrogen supply tube bundle trailer, and the hydrogen in the tube bundle trailer is discharged to a compressor or a pressure container in the hydrogen filling station to provide high-pressure hydrogen for a downstream hydrogenation machine. However, in the process of connecting the tube bundle trailer with the compressor or the pressure vessel, the tube bundle trailer is mostly connected with a hydrogen conveying pipeline consisting of a plurality of simple components such as a connecting hose, a high-pressure pipeline, a safety valve and a ball valve, the structure is simpler, and most of the hydrogen filling stations are caused by the fact that the hydrogen filling stations belong to new energy source stations and are built in China. But in this in-process but have hydrogen leakage or have under the condition of the source of an unknown fire unable monitoring and report to the police and shut down, the mass flow that can't count hydrogen and carry, can't in time prevent the unidentified impurity that exists in the air supply, can't carry out hydrogen sampling analysis, can't avoid the long tube trailer when unexpected swift current car appears the coupling hose fracture to and can't carry out pipeline sweep and medium replacement when the pipeline is overhauld and is maintained, do not possess simultaneously and prevent functions such as static and warning.

Disclosure of Invention

The invention aims to provide a multifunctional hydrogen discharge system which is reasonable in structural design and safe and reliable to use.

The invention adopts the following technical scheme for solving the technical problems, and the safe and reliable multifunctional hydrogen discharging system is characterized by comprising a box body module, and a pipeline unit and a circuit unit which are arranged in the box body module, wherein the pipeline unit comprises a hydrogen discharging pipeline, a hydrogen replacing pipeline and a nitrogen replacing and testing pipeline; the hydrogen unloading pipeline is sequentially provided with a CGA1350 joint, a connecting hose I, a pulling-off device, an electrostatic grounding alarm, a filter I, an emergency cut-off electromagnetic valve, a mass flow meter, a high-pressure ball valve V, a human body electrostatic discharge alarm, a one-way valve I and a hydrogen output interface along the gas conveying direction, the gas input end of the hydrogen unloading pipeline is connected with the hydrogen unloading joint of a hydrogen long pipe trailer through the CGA1350 joint, the hydrogen unloading pipeline between the mass flow meter and the high-pressure ball valve V is sequentially connected with a gas emptying pipeline and a gas pressure measuring pipeline along the gas conveying direction, the gas emptying pipeline is sequentially provided with an emptying ball valve, an emptying needle valve, a backfire preventer and a gas emptying interface along the gas conveying direction, and the gas pressure measuring pipeline is connected with a pressure gauge and a pressure sensor which are connected in parallel with each other through the; a hydrogen steel cylinder joint, a connecting hose II, a one-way valve II, a filter II and a high-pressure ball valve II are sequentially arranged on the hydrogen replacement pipeline along the gas conveying direction, the gas input end of the hydrogen replacement pipeline is connected with a hydrogen steel cylinder in a hydrogen container lattice through the hydrogen steel cylinder joint, and the gas output end of the hydrogen replacement pipeline is connected with a hydrogen discharge pipeline between the electrostatic grounding alarm and the filter I; the nitrogen displacement and test pipeline is sequentially provided with a nitrogen steel cylinder joint, a connecting hose III and a one-way valve III along the gas conveying direction, the gas input end of the nitrogen displacement and test pipeline is connected with a nitrogen steel cylinder in the nitrogen container grid through the nitrogen steel cylinder joint, and the gas output end of the nitrogen displacement and test pipeline is connected with the hydrogen displacement pipeline between the one-way valve II and the filter II; the hydrogen concentration detector, the flame detector, the forced air exhaust system, the audible and visual alarm, the metering display and the PLC control system in the circuit unit are all arranged in the box body module, the hydrogen concentration detector, the flame detector, the forced air exhaust system, the audible and visual alarm and the metering display are respectively electrically connected with the PLC control system through circuits, and the emergency cut-off solenoid valve, the mass flow meter and the pressure sensor are respectively electrically connected with the PLC control system through circuits.

Further limiting, a hydrogen bypass connecting pipeline is arranged on a hydrogen discharging pipeline between the mass flow meter and the high-pressure ball valve V, a high-pressure ball valve I and a safety valve I are sequentially arranged on the hydrogen bypass connecting pipeline along the gas conveying direction, and the gas output end of the hydrogen bypass connecting pipeline is connected with a gas discharging pipeline between the discharging needle valve and the backfire preventer.

Further inject, nitrogen gas replacement and test pipeline between check valve III and the check valve II is equipped with nitrogen gas bypass connecting line, is equipped with high-pressure ball valve III and relief valve II along the gas conveying direction on this nitrogen gas bypass connecting line in proper order, and the gas output end and the evacuation needle valve of nitrogen gas bypass connecting line and the gas between the back fire preventer are emptied the pipeline and are connected.

Further inject, be equipped with hydrogen sampling pipeline on the hydrogen discharge pipeline between filter I and the emergency cut-off solenoid valve, this hydrogen sampling pipeline is equipped with coupling hose IV and high-pressure needle valve along the gas conveying direction in proper order on the road, and the gas input end of hydrogen sampling pipeline is equipped with the hydrogen sample connection, and this hydrogen sample connection connects the hydrogen sampling bottle for sample and test the hydrogen in the hydrogen sampling bottle through the hydrogen sampling bottle on to the hydrogen long tube trailer.

The safe and reliable operation method of the multifunctional hydrogen discharge system is characterized by comprising the following specific processes:

step S1: the hydrogen long pipe trailer, the hydrogen packaging grid and the nitrogen packaging grid are respectively installed in place, and the system is powered on;

step S2: the operator touches the human body electrostatic discharge alarm until the voice prompts that the electrostatic discharge is finished;

step S3: connecting the electrostatic grounding alarm with a hydrogen long-tube trailer, and performing electrostatic discharge on the hydrogen long-tube trailer;

step S4: opening a nitrogen packaging grid with a switch, an emergency cut-off electromagnetic valve and a high-pressure ball valve II, closing the high-pressure ball valve II after a pressure gauge is stabilized to 5MPa, opening an emptying ball valve and an emptying needle valve until the pressure gauge is stabilized to 0.2MPa, and then closing the emptying ball valve and the emptying needle valve;

step S5: opening the high-pressure ball valve II until the pressure gauge is stabilized to 5MPa, closing the high-pressure ball valve II, opening the emptying ball valve and the emptying needle valve until the pressure gauge is stabilized to 0.2MPa, and then closing the emptying ball valve and the emptying needle valve;

step S6: step S5, circulating operation is carried out for 5 times, after nitrogen replacement is finished, the nitrogen container grid with the switch and the high-pressure ball valve II is closed;

step S7: opening a hydrogen packaging grid with a switch, an emergency cut-off electromagnetic valve and a high-pressure ball valve II, closing the high-pressure ball valve II after a pressure gauge is stabilized to 5MPa, opening an emptying ball valve and an emptying needle valve until the pressure gauge is stabilized to 0.2MPa, and then closing the emptying ball valve and the emptying needle valve;

step S8: step S5, circulating operation is carried out for 5 times, after hydrogen replacement is finished, the hydrogen container grid with the switch and the high-pressure ball valve II is closed;

step S9: and opening the hydrogen long pipe trailer, and providing hydrogen for the downstream by switching on the hydrogen long pipe trailer, and cutting off the electromagnetic valve and the high-pressure ball valve V in an emergency way.

Compared with the prior art, the invention has the following beneficial effects:

1. the safe and reliable multifunctional hydrogen discharge system can be used as a gas discharge device of a tube bundle trailer, can be used as a filling device to directly fill downstream equipment, and can be used for pricing settlement service of filled gas through a mass flowmeter and a metering display;

2. the safe and reliable multifunctional hydrogen discharge system is provided with the human body static electricity discharge alarm, an operator firstly releases human body static electricity before gas discharge operation is carried out, and voice prompt is given to complete discharge after the static electricity discharge is finished, so that safety accidents caused by live operation are prevented;

3. the safe and reliable multifunctional hydrogen discharge system is provided with the electrostatic grounding alarm, when a hydrogen long-tube trailer enters a specified parking space to perform gas discharge operation, the electrostatic grounding alarm is firstly connected to discharge static electricity on the trailer, and the continuous discharge of static electricity generated by gas friction in the continuous gas discharge process is ensured;

4. the safe and reliable multifunctional hydrogen discharge system is provided with a hydrogen concentration detector for monitoring the hydrogen concentration condition of the equipment in real time, once the hydrogen leakage concentration exceeds the standard, the air source can be automatically cut off by an emergency cut-off electromagnetic valve, and meanwhile, a forced exhaust system is started to exhaust hydrogen in the equipment and an audible and visual alarm is started to prompt a worker that the equipment fails;

5. the safe and reliable multifunctional hydrogen discharge system is provided with a flame detector for monitoring the environmental condition of equipment in real time, and once an unknown fire source occurs, the air source can be automatically cut off by cutting off the electromagnetic valve in an emergency way, and meanwhile, the audible and visual alarm is started to prompt a worker that the equipment fails;

6. the safe and reliable multifunctional hydrogen discharging system is provided with the emergency pulling-off device, and mainly has the main functions of preventing the hydrogen long-tube trailer from being separated from the system and cut off in time when the hydrogen long-tube trailer accidentally slides or the driver is mistakenly operated in the discharging process, preventing the leakage accident caused by accidental breakage of the connecting hose and protecting the safety of the system;

7. the safe and reliable multifunctional hydrogen discharge system is provided with a hydrogen sampling port, so that the hydrogen in the hydrogen long-tube trailer can be sampled and analyzed, and qualified hydrogen is supplied to a hydrogenation station;

8. the safe and reliable multifunctional hydrogen discharge system is provided with the pressure sensor, and once the pressure in the system exceeds or is lower than the set upper pressure limit or lower pressure limit, the pressure can be fed back to the station control system in time;

9. the safe and reliable multifunctional hydrogen discharge system is provided with the filter, so that the cleanliness of hydrogen in the system is guaranteed, and the damage to downstream functional parts is prevented;

10. the safety valve is arranged on the hydrogen discharge pipeline of the safe and reliable multifunctional hydrogen discharge system, so that the pressure can be timely discharged under the condition of overpressure in the pipeline, and the conditions of pipeline breakage and instrument damage are prevented;

11. the safe and reliable multifunctional hydrogen discharge system is provided with the backfire preventer, so that the hydrogen in the system can be safely discharged;

12. the nitrogen pipeline of the safe and reliable multifunctional hydrogen discharge system is provided with a nitrogen steel cylinder joint, a connecting hose and a one-way valve, and the high-pressure ball valve, the filter, the high-pressure ball valve and the safety valve can provide services such as gas tightness test, pressure resistance test, nitrogen replacement, gas purging during equipment maintenance and the like for the system, and simultaneously ensure the cleanliness of hydrogen and prevent the pressure from exceeding a limit value;

13. the hydrogen pipeline of the safe and reliable multifunctional hydrogen discharge system is provided with a hydrogen steel cylinder joint, a connecting hose, a one-way valve, a high-pressure ball valve, a filter, the high-pressure ball valve and a safety valve to perform hydrogen replacement on the system, so that the purity and cleanliness of hydrogen in the system are guaranteed, and the pressure is prevented from exceeding a limit value;

14. the hydrogen pipeline, the nitrogen pipeline and the hydrogen discharge pipeline of the safe and reliable multifunctional hydrogen discharge system are respectively provided with the one-way valve, so that gas can be effectively prevented from flowing reversely;

15. the high-pressure ball valves are respectively arranged on the hydrogen pipeline and the nitrogen pipeline of the safe and reliable multifunctional hydrogen discharge system, and are used for ensuring that the normal gas supply of the system is not influenced by the maintenance and replacement of the connection between the high-pressure ball valves and the system when the safety valves on the corresponding pipelines are in failure, and the high-pressure ball valves are arranged on the connecting pipelines of the pressure gauge and the pressure sensor and are used for ensuring that the normal gas supply of the system is not influenced by the maintenance and replacement of the connection between the high-pressure ball valves and the system when the pressure gauge or the pressure sensor on the corresponding pipelines are.

Drawings

FIG. 1 is a piping connection diagram of a safe and reliable multi-functional hydrogen discharge system according to the present invention.

In the figure: 1-a hydrogen concentration detector, 2-a flame detector, 3-a forced exhaust system, 4-an audible and visual alarm, 5-a metering display, 6-a CGA1350 joint, 7-a connecting hose I, 8-a pull-off device, 9-a filter I, 10-an emergency cut-off electromagnetic valve, 11-a mass flowmeter, 12-an emptying ball valve, 13-an emptying needle valve, 14-a gas emptying interface, 15-a backfire preventer, 16-a safety valve I, 17-a high-pressure ball valve I, 18-a human body electrostatic release alarm, 19-a one-way valve I, 20-a hydrogen output interface, 21-a hydrogen steel cylinder joint, 22-a connecting hose II, 23-a one-way valve II, 24-a high-pressure ball valve II, 25-a filter II and 26-a hydrogen sampling port, 27-a high-pressure needle valve, 28-a high-pressure ball valve III, 29-a one-way valve III, 30-a safety valve II, 31-a pressure gauge, 32-a pressure sensor, 33-a connecting hose III, 34-a nitrogen gas steel cylinder joint, 35-a high-pressure ball valve IV, 36-an electrostatic grounding alarm and 37-a high-pressure ball valve V, 38-a connecting hose IV.

Detailed Description

The technical scheme of the invention is described in detail by combining the attached drawings, and the safe and reliable multifunctional hydrogen discharging system comprises a box body module, and a pipeline unit and a circuit unit which are arranged in the box body module, wherein the pipeline unit comprises a hydrogen discharging pipeline, a hydrogen replacing pipeline and a nitrogen replacing and testing pipeline; the hydrogen discharging pipeline is sequentially provided with a CGA1350 connector 6, a connecting hose I7, a pulling-off device 8, an electrostatic grounding alarm 36, a filter I9, an emergency cut-off electromagnetic valve 10, a mass flow meter 11, a high-pressure ball valve V37, a human body electrostatic discharge alarm 18, a one-way valve I19 and a hydrogen output interface 20 along the gas conveying direction, the gas input end of the hydrogen discharging pipeline is connected with the hydrogen discharging connector of a hydrogen long pipe trailer through the CGA1350 connector 6, the hydrogen discharging pipeline between the mass flow meter 11 and the high-pressure ball valve V37 is sequentially connected with a gas emptying pipeline and a gas pressure measuring pipeline along the gas conveying direction, an emptying ball valve 12, an emptying needle valve 13, a backfire preventer 15 and a gas emptying interface 14 are sequentially arranged on the gas emptying pipeline along the gas conveying direction, and a pressure gauge 31 and a pressure sensor 32 which are mutually connected in parallel are connected on the gas pressure measuring pipeline through a high-pressure ball valve IV 35; a hydrogen steel cylinder connector 21, a connecting hose II 22, a one-way valve II 23, a filter II 25 and a high-pressure ball valve II24 are sequentially arranged on the hydrogen replacement pipeline along the gas conveying direction, the gas input end of the hydrogen replacement pipeline is connected with a hydrogen steel cylinder in a hydrogen container lattice through the hydrogen steel cylinder connector 21, and the gas output end of the hydrogen replacement pipeline is connected with a hydrogen discharge pipeline between the electrostatic grounding alarm 36 and the filter I9; a nitrogen steel cylinder connector 34, a connecting hose III 33 and a one-way valve III 29 are sequentially arranged on the nitrogen displacement and test pipeline along the gas conveying direction, the gas input end of the nitrogen displacement and test pipeline is connected with a nitrogen steel cylinder in the nitrogen container grid through the nitrogen steel cylinder connector 34, and the gas output end of the nitrogen displacement and test pipeline is connected with a hydrogen displacement pipeline between the one-way valve II 23 and the filter II 25; the hydrogen concentration detector 1, the flame detector 2, the forced exhaust system 3, the audible and visual alarm 4, the metering display 5 and the PLC control system in the circuit unit are all arranged in the box body module, the hydrogen concentration detector 1, the flame detector 2, the forced exhaust system 3, the audible and visual alarm 4 and the metering display 5 are respectively electrically connected with the PLC control system through circuits, and the emergency cut-off electromagnetic valve 10, the mass flow meter 11 and the pressure sensor 32 are respectively electrically connected with the PLC control system through circuits.

A hydrogen bypass connecting pipeline is arranged on a hydrogen discharge pipeline between the mass flow meter 11 and the high-pressure ball valve V37, a high-pressure ball valve I17 and a safety valve I16 are sequentially arranged on the hydrogen bypass connecting pipeline along the gas conveying direction, and the gas output end of the hydrogen bypass connecting pipeline is connected with a gas emptying pipeline between an emptying needle valve 13 and a backfire preventer 15.

The nitrogen replacement and test pipeline between the one-way valve III 29 and the one-way valve II 23 is provided with a nitrogen bypass connecting pipeline, a high-pressure ball valve III 28 and a safety valve II30 are sequentially arranged on the nitrogen bypass connecting pipeline along the gas conveying direction, and the gas output end of the nitrogen bypass connecting pipeline is connected with a gas emptying pipeline between an emptying needle valve 13 and a backfire preventer 15.

A hydrogen sampling pipeline is arranged on a hydrogen discharge pipeline between a filter I9 and an emergency cut-off electromagnetic valve 10, a connecting hose IV 38 and a high-pressure needle valve 27 are sequentially arranged on the hydrogen sampling pipeline along the gas conveying direction, a hydrogen sampling port 26 is arranged at the gas input end of the hydrogen sampling pipeline, and the hydrogen sampling port 26 is connected with a hydrogen sampling bottle and used for sampling hydrogen on a hydrogen long-tube trailer through the hydrogen sampling bottle and testing the hydrogen in the hydrogen sampling bottle.

The invention relates to a safe and reliable operation method of a multifunctional hydrogen discharge system, which comprises the following specific processes:

step S1: the hydrogen long pipe trailer, the hydrogen packaging grid and the nitrogen packaging grid are respectively installed in place, and the system is powered on;

step S2: the operator touches the human body electrostatic discharge alarm 18 by hand until the voice prompts that the electrostatic discharge is finished;

step S3: connecting the electrostatic grounding alarm 36 with the hydrogen long-tube trailer, and performing electrostatic discharge on the hydrogen long-tube trailer;

step S4: opening a nitrogen packaging grid with a switch, an emergency cut-off electromagnetic valve 10 and a high-pressure ball valve II24, closing the high-pressure ball valve II24 when a pressure gauge 31 is stabilized to 5MPa, opening an emptying ball valve 12 and an emptying needle valve 13 until the pressure gauge 31 is stabilized to 0.2MPa, and then closing the emptying ball valve 12 and the emptying needle valve 13;

step S5: opening the high-pressure ball valve II24 until the pressure gauge 31 is stabilized to 5MPa, closing the high-pressure ball valve II24, opening the emptying ball valve 12 and the emptying needle valve 13 until the pressure gauge 31 is stabilized to 0.2MPa, and then closing the emptying ball valve 12 and the emptying needle valve 13;

step S6: step S5, circulating operation is carried out for 5 times, after nitrogen replacement is finished, the nitrogen container grid with a switch and a high-pressure ball valve II24 is closed;

step S7: opening a hydrogen packaging grid with a switch, an emergency cut-off electromagnetic valve 10 and a high-pressure ball valve II24, closing the high-pressure ball valve II24 when a pressure gauge 31 is stabilized to 5MPa, opening an emptying ball valve 12 and an emptying needle valve 13 until the pressure gauge 31 is stabilized to 0.2MPa, and then closing the emptying ball valve 12 and the emptying needle valve 13;

step S8: step S5, circulating operation is carried out for 5 times, after hydrogen replacement is finished, the hydrogen container grid with a switch and a high-pressure ball valve II24 is closed;

step S9: and the hydrogen can be provided for the downstream by opening the hydrogen long-tube trailer with a switch, and emergently cutting off the electromagnetic valve 10 and the high-pressure ball valve V37.

The invention relates to a method for sampling the hydrogen purity in a hydrogen long-tube trailer, which comprises the following steps:

1. the hydrogen sampling port 26 is connected with a hydrogen sampling bottle;

2. opening the hydrogen long tube trailer with a switch, opening the high-pressure needle valve 27, and collecting a certain amount of hydrogen in the hydrogen long tube trailer;

3. and closing the hydrogen long pipe trailer, and testing the hydrogen in the hydrogen sampling bottle by using the switch and the high-pressure needle valve 27.

The system of the invention needs to be operated during maintenance:

1. closing the hydrogen long pipe trailer, the hydrogen packaging grid and the nitrogen packaging grid with switches and the high-pressure ball valve 37, and stopping the system;

2. opening the emergency cut-off electromagnetic valve 10, the emptying ball valve 12 and the emptying needle valve 13, exhausting gas in the pipeline until the value of a pressure gauge 31 is 0, and closing the emergency cut-off electromagnetic valve 10, the emptying ball valve 12 and the emptying needle valve 13;

3. repairing the parts needing to be repaired;

4. after the overhaul is finished, the system is powered on, and an operator touches the human body electrostatic discharge alarm 18 by hands until the voice prompts that the electrostatic discharge is finished;

5. opening a nitrogen packaging grid with a switch, emergently cutting off an electromagnetic valve 10, an emptying ball valve 12 and an emptying needle valve 13, continuously purging the system for 10min, closing the emptying ball valve 12 and the emptying needle valve 13 after purging is finished, and closing the emptying ball valve 12 and the emptying needle valve 13 after performing an air tightness test and a pressure resistance test on the system;

6. opening a nitrogen packaging grid with a switch, an emergency cut-off electromagnetic valve 10 and a high-pressure ball valve II24, closing the high-pressure ball valve II24 when a pressure gauge 31 is stabilized to 5MPa, opening an emptying ball valve 12 and an emptying needle valve 13 until the pressure gauge 31 is stabilized to 0.2MPa, and then closing the emptying ball valve 12 and the emptying needle valve 13;

7. opening the high-pressure ball valve II24 until the pressure gauge 31 is stabilized to 5MPa, closing the high-pressure ball valve II24, opening the emptying ball valve 12 and the emptying needle valve 13 until the pressure gauge 31 is stabilized to 0.2MPa, and then closing the emptying ball valve 12 and the emptying needle valve 13;

8. step 7, circulating operation is carried out for 5 times, after nitrogen replacement is finished, the nitrogen container grid with a switch and a high-pressure ball valve II24 is closed;

9. opening a hydrogen packaging grid with a switch, an emergency cut-off electromagnetic valve 10 and a high-pressure ball valve II24, closing the high-pressure ball valve II24 when a pressure gauge 31 is stabilized to 5MPa, opening an emptying ball valve 12 and an emptying needle valve 13 until the pressure gauge 31 is stabilized to 0.2MPa, and then closing the emptying ball valve 12 and the emptying needle valve 13;

10. 7, performing circulation operation for 5 times, and closing a hydrogen container grid with a switch and a high-pressure ball valve II24 after hydrogen replacement is finished;

11. the hydrogen can be provided for the downstream by opening the hydrogen long-tube trailer with a switch, and cutting off the electromagnetic valve 10 and the high-pressure ball valve V37 in an emergency way.

While there have been shown and described what are at present considered the fundamental principles of the invention, its essential features and advantages, the invention further resides in various changes and modifications which fall within the scope of the invention as claimed.