CN217843485U

CN217843485U - Nitrogen replacement system for hydrogen transmission, distribution and storage equipment

Info

Publication number: CN217843485U
Application number: CN202220812901.0U
Authority: CN
Inventors: 祝恒心; 李博; 高明
Original assignee: Dalian Paisi Gas Equipment Co ltd
Current assignee: Dalian Paisi Gas Equipment Co ltd
Priority date: 2022-04-08
Filing date: 2022-04-08
Publication date: 2022-11-18
Anticipated expiration: 2032-04-08

Abstract

The utility model relates to the technical field of hydrogen safe use, in particular to a nitrogen replacement system for hydrogen transmission and distribution and storage equipment, which comprises an inlet block valve and an outlet block valve which are respectively arranged on an air inlet and an air outlet of a gas storage tank, wherein a quick joint is arranged between the gas storage tank and the inlet block valve, and the other end of the quick joint is connected with a nitrogen busbar through a high-pressure nitrogen-filled hose; the highest point of the gas storage tank is provided with an emptying pipe, the emptying pipe is connected with a check valve, one end of the check valve, which is connected with the emptying pipe, is also connected with a bleeding stop valve, the other end of the bleeding stop valve is connected with a bleeding ball valve, and the other end of the bleeding ball valve is connected with the gas storage tank; the gas storage tank is provided with a safety valve and a pressure gauge. The system can simply and quickly complete the nitrogen replacement work of the hydrogen pipeline and the storage equipment, and can ensure the safety and the stability of the system.

Description

Nitrogen replacement system for hydrogen transmission, distribution and storage equipment

Technical Field

The utility model relates to a hydrogen safe handling technical field especially relates to a nitrogen gas replacement system for hydrogen transmission and distribution and storage facilities.

Background

The hydrogen energy is taken as a zero-carbon high-efficiency new energy, the application value in the world energy transformation is increasingly prominent, and the hydrogen energy is known as one of the most promising energy sources in the twenty-first century. The hydrogen transportation is a link and a bridge of a hydrogen energy industrial chain and is vital to the continuous development of the whole hydrogen energy industrial chain. Wherein, pipeline transportation is an important way for realizing large-scale and long-distance transportation of hydrogen with lower cost. Pipeline hydrogen transportation is generally high-pressure gaseous transportation, and high-pressure gaseous transportation means that the hydrogen compressor is adopted to compress hydrogen to accord with higher requirement at normal temperature, has higher density, and adopts the technical scheme that a sealed container or pipeline is adopted to transport hydrogen to a destination and then pressure regulation is carried out. When various hydrogen production systems start and stop vehicles in the process of system maintenance and transportation, purging and replacement are needed, residual hydrogen or air in the systems is blown out cleanly, especially the residual gas at the tail end of a dead angle needs to be noticed, the content of hydrogen and oxygen in the systems is analyzed, the specified value is reached, and maintenance, fire starting and vehicle starting and stopping can be carried out.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a nitrogen gas replacement system for hydrogen gas transmission and distribution and storage facilities, the technical scheme of its adoption is:

a nitrogen replacement system for hydrogen gas transmission, distribution and storage equipment comprises an inlet block valve and an outlet block valve which are respectively arranged on an air inlet and an air outlet of a gas storage tank in the hydrogen gas transmission, distribution and storage equipment, wherein a quick joint is arranged between the gas storage tank and the inlet block valve, and the other end of the quick joint is connected with a nitrogen gas busbar through a high-pressure nitrogen filling hose; an emptying pipe is arranged at the highest point of the gas storage tank, a check valve is connected to the emptying pipe, a bleeding stop valve is further connected to one end, connected with the emptying pipe, of the check valve, the other end of the bleeding stop valve is connected with a bleeding ball valve, and the other end of the bleeding ball valve is connected with the gas storage tank; and a safety valve and a pressure gauge are arranged on the gas storage tank.

Further, the quick coupling is arranged on the gas storage tank body.

Further, the quick coupling is provided on a hydrogen gas pipe between the gas storage tank and the inlet block valve.

Further, the safety valve is arranged at the upper end of one side of the gas storage tank, and the emptying pipe is arranged on an outlet of the safety valve.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model discloses a nitrogen gas replacement system for hydrogen gas transmission and distribution and storage facilities, its whole hydrogen gas transmission and distribution and storage facilities entry, export dispose respectively and cut off the valve, make whole equipment and external wall. The hydrogen pipeline or the gas storage tank is provided with a quick joint, so that the high-pressure nitrogen-filled hose can be conveniently and quickly connected with and disconnected from the hydrogen pipeline. The nitrogen source used in the system is a nitrogen bus bar, and is connected with a pipeline needing nitrogen replacement through a high-pressure nitrogen filling hose. The nitrogen gas busbar accessible is changed the nitrogen cylinder and is supplied the air supply, and removes the convenience, need not to dispose nitrogen generator, practices thrift cost such as equipment purchase, installation, operation, maintenance. The peak of the gas storage tank is provided with a manual emptying pipe, so that residual gas at the tail end of a dead angle cannot be formed, and the emptying pipe is provided with a check valve to prevent backfire during emptying, so that the system safety is higher. The system can simply and quickly complete the nitrogen replacement work of the hydrogen pipeline and the storage equipment, and can ensure the safety and the stability of the system.

Drawings

FIG. 1 is a schematic structural view of the present invention;

in the figure: 1. a nitrogen bus; 2. a high pressure nitrogen filled hose; 3. a quick coupling; 4. an inlet block valve; 5. an outlet block valve; 6. a gas storage tank; 7. a safety valve; 8. a check valve; 9. a bleeding stop valve; 10. a blow-off ball valve; 11. and a pressure gauge.

Detailed Description

The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings.

As shown in figure 1, the utility model discloses a nitrogen gas replacement system for hydrogen gas transmission & distribution and storage facilities for hydrogen manufacturing system opens and stops the use when the vehicle in system maintenance, transportation way. The utility model provides a specific embodiment does: the hydrogen gas transmission, distribution and storage equipment is characterized in that an air inlet and an air outlet of a gas storage tank 6 are respectively provided with a block valve, the air inlet of the gas storage tank 6 is provided with an inlet block valve 4, and the air outlet is provided with an outlet block valve 5, so that the whole system is blocked from the outside. A quick joint 3 is arranged between the gas storage tank 6 and the inlet closing valve 4, and the quick joint 3 can be selectively arranged on the body of the gas storage tank 6 or on a hydrogen pipeline between the gas storage tank 6 and the inlet closing valve 4; the other end of the quick connector 3 is provided with a high-pressure nitrogen filling hose 2, the other end of the high-pressure nitrogen filling hose 2 is connected with the existing nitrogen busbar 1, the nitrogen busbar 1 can supplement a nitrogen source by replacing a nitrogen bottle, and the movement is more convenient. And the quick connector 3 can also enable the high-pressure nitrogen-filled hose 2 to be conveniently and quickly connected with and disconnected from the gas storage tank 6 or the hydrogen pipeline. Preferably, the high-pressure nitrogen-filled hose 2 is a metal hose. In addition, because the specific gravity of the hydrogen is only 0.069, the emptying pipe is arranged at the highest point of the gas storage tank 6, and the emptying pipe is provided with a check valve 8 to prevent tempering during emptying. The gas storage tank 6 is also provided with a safety valve 7 and a pressure gauge 11, the safety valve 7 performs overpressure protection, and the pressure gauge 11 performs pressure monitoring. It is preferable that a safety valve 7 is provided at an upper end of one side of the gas container 6, and a vent pipe is provided at an outlet of the safety valve 7; still be provided with the ball valve 10 that diffuses on the gas holder 6, diffuse the ball valve 10 other end and connect and diffuse stop valve 9, diffuse stop valve 9 other end and connect check valve 8 and connect blow-down pipe one end.

When nitrogen substitution is to be performed, first, the inlet block valve 4 and the outlet block valve 5 are closed, and this section of piping is brought into an isolated state. Then the relief ball valve 10 and the relief stop valve 9 are opened, the pressure in the pipeline is relieved to 0, and then the relief ball valve 10 and the relief stop valve 9 are closed. And a high-pressure nitrogen filling hose 2 is connected to the quick connector 3, a valve on the quick connector 3 is opened, and nitrogen is slowly filled into the hydrogen pipeline through the nitrogen bus bar 1. The flow rate of nitrogen gas was controlled so that the pressure in the pipe was raised to and maintained at about 2barg, and then the bleed ball valve 10 and the bleed stop valve 9 were slightly opened and continuously discharged. And measuring the concentration of hydrogen in the exhaust gas by using an LEL measuring instrument, and measuring once every 5 minutes until the measurement result of the LEL measuring instrument is qualified. The test can be carried out several times according to actual conditions. And finally, closing a valve on the quick connector 3, discharging the pressure in the pipeline to 0 through the diffusion ball valve 10 and the diffusion stop valve 9, closing the diffusion ball valve 10 and the diffusion stop valve 9, and detaching the high-pressure nitrogen filling hose 2, so that nitrogen replacement is smoothly completed.

If the nitrogen replacement after the overhaul is measured, an oxygen analyzer is adopted to measure the concentration of oxygen in the exhaust gas until the volume concentration of the oxygen is lower than 0.5 percent. According to the regulation of the current national standard 'safety technical code for hydrogen use', the oxygen content in the replaced nitrogen gas can not exceed 0.5%.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in the embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A nitrogen displacement system for hydrogen gas delivery and storage facilities, comprising: the device comprises an inlet block valve (4) and an outlet block valve (5) which are respectively arranged on an air inlet and an air outlet of a gas storage tank (6) in hydrogen gas transmission, distribution and storage equipment, wherein a quick joint (3) is arranged between the gas storage tank (6) and the inlet block valve (4), and the other end of the quick joint (3) is connected with a nitrogen gas busbar (1) through a high-pressure nitrogen filling hose (2); an emptying pipe is arranged at the highest point of the gas storage tank (6), a check valve (8) is connected to the emptying pipe, a relief stop valve (9) is further connected to one end, connected with the emptying pipe, of the check valve (8), the other end of the relief stop valve (9) is connected with a relief ball valve (10), and the other end of the relief ball valve (10) is connected with the gas storage tank (6); the gas storage tank (6) is provided with a safety valve (7) and a pressure gauge (11).

2. A nitrogen substitution system for a hydrogen gas delivery and storage device according to claim 1, wherein: the quick coupling (3) is arranged on the gas storage tank (6) body.

3. A nitrogen substitution system for a hydrogen gas delivery and storage device according to claim 1, wherein: the quick joint (3) is arranged on a hydrogen pipeline between the gas storage tank (6) and the inlet isolating valve (4).

4. A nitrogen substitution system for a hydrogen gas delivery and storage device according to claim 1, wherein: the safety valve (7) is arranged at the upper end of one side of the gas storage tank (6), and the emptying pipe is arranged on an outlet of the safety valve (7).