Hydrogen storing and mixing conveying system

Abstract

The utility model discloses a hydrogen storing and mixing conveying system, relates to the technical field of hydrogen energy utilization, and aims to solve the problems that danger is easy to occur and storage and conveying are difficult under high pressure due to existence of hydrogen embrittlement, and time and money are wasted when a hydrogen conveying pipeline is newly built. The interior of the low-pressure hydrogen storage cabinet is of a piston cavity structure, a piston of the low-pressure hydrogen storage cabinet moves in the vertical direction along the inner wall of the low-pressure hydrogen storage cabinet, a hydrogen storage cavity is formed below the piston, the lower end of the outer side of the hydrogen storage cavity is connected with a gas inlet pipe and a gas outlet pipe, and the gas inlet pipe is communicated with a constant-pressure hydrogen production device. The gas outlet pipe is divided into two paths which are respectively connected with the medium-pressure mixing pipeline and the low-pressure mixing pipeline; the upper part of the piston is used for applying downward pressure to the hydrogen storage chamber; a pressurizing machine is connected into the medium-pressure mixing pipeline, and the outlet end of the pipeline is connected into an air inlet of the medium-pressure mixing pipeline; the outlet end of the low-pressure mixing pipeline is connected into the gas inlet of the low-pressure mixing gas pipeline; the device does not need to newly build a hydrogen conveying pipeline, and is safe and reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrogen energy utilization, in particular to a hydrogen storage and mixing and transportation system. Background Art

[0002] Hydrogen energy is an ideal clean energy with huge development potential. How to store and transport hydrogen conveniently and efficiently in the field of hydrogen storage and transportation has become an urgent problem to be solved. According to the different forms of hydrogen, there are currently main hydrogen storage technologies such as solid hydrogen storage, low-temperature liquid hydrogen storage, high-pressure gaseous hydrogen storage and organic liquid hydrogen storage, each with its own characteristics and scope of application. Among them, high-pressure gaseous hydrogen storage is the most widely used hydrogen storage technology. However, the widely used metal materials at this stage, especially the high-strength materials that can be used to manufacture high-pressure containers, will be affected by hydrogen embrittlement when in contact with hydrogen for a long time, that is, the strength and plasticity are significantly reduced, and hydrogen-induced delayed fracture under low stress, etc., generally referred to as hydrogen embrittlement or hydrogen damage. To this day, there is still no good solution for hydrogen embrittlement. The existence of hydrogen embrittlement risk may cause hydrogen storage tanks to fail. In addition, the flammable and explosive properties of hydrogen can easily cause fires, explosions and even major disasters. Therefore, hydrogen storage, especially high-pressure hydrogen storage, has high requirements for storage tank conditions.

[0003] In addition, China's hydrogen pipeline construction is still in its infancy, mainly in the Bohai Bay, Yangtze River Delta and other regions. Since the construction of new hydrogen pipelines requires a lot of money and time, many countries have begun to use existing natural gas pipelines to conduct research and experiments on hydrogen-blended natural gas. There are more and more existing technologies in this regard, such as the announcement number CN113090946B, named a clam-type pipeline structure for promoting the mixing of natural gas and hydrogen in a hydrogen-blended natural gas pipeline, which discloses the installation of a clam-type bulge structure in the original cylindrical pipeline structure, thereby disrupting the incoming flow, forming vortexes or turbulence, so that the two are better mixed, but it is only a mixing method; another example is the announcement number CN110095359B, named a material fatigue damage test method under a high-pressure hydrogen-blended natural gas environment, which discloses a method of using a loading shaft to push a steel ball to apply a load to a disc thin film sample, avoiding a complex servo test mechanism, but it is also an experiment on high-pressure hydrogen, and the tank life problem caused by the risk of hydrogen embrittlement and the safety problems it brings cannot be effectively solved. Therefore, a hydrogen storage and mixing and transportation system is urgently needed to solve this problem. Utility Model Content

[0004] The utility model aims to provide a hydrogen storage and mixing and transporting system to solve the problems that hydrogen embrittlement leads to danger under high pressure, is difficult to store and transport, and is time-consuming and costly to build new hydrogen pipelines.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a hydrogen storage and mixing and transportation system, comprising a normal pressure hydrogen production device, a low-pressure hydrogen storage cabinet, a medium-pressure mixing pipeline and a low-pressure mixing pipeline, wherein the interior of the low-pressure hydrogen storage cabinet is a piston chamber structure, and the movable direction of the piston is to move in the vertical direction along the inner wall of the low-pressure hydrogen storage cabinet, and the lower end of the piston is a hydrogen storage chamber, and the lower end of the outer side is connected with an air inlet pipe and an air outlet pipe, the air inlet pipe is connected to the normal pressure hydrogen production device, and the air outlet pipe is divided into two ways respectively connected to the medium-pressure mixing pipeline and the low-pressure mixing pipeline, and the upper part of the piston is used to apply downward pressure to the hydrogen storage chamber; a compressor is connected to the medium-pressure mixing pipeline, and its pipeline outlet end is connected to the air inlet of the medium-pressure mixed gas pipeline; the outlet end of the low-pressure mixing pipeline is connected to the air inlet of the low-pressure mixed gas pipeline.

[0006] Preferably, the piston has at least two working states. In the first working state, no counterweight is placed on the upper end of the piston, and the piston is used to store hydrogen in the hydrogen storage chamber. In the second working state, a counterweight is placed on the upper end of the piston, and the piston is used to pressurize the hydrogen in the hydrogen storage chamber.

[0007] Preferably, the medium-pressure mixed gas pipeline is provided with two air inlets, the other of which is connected to the incoming air pipeline of the medium-pressure natural gas pipeline network; the medium-pressure mixed gas pipeline and the incoming air pipeline of the medium-pressure natural gas pipeline network are respectively provided with regulating valves, safety valves, temperature measuring points and pressure measuring points.

[0008] Preferably, the low-pressure mixed gas pipeline is provided with two air inlets, the other of which is connected to the incoming air pipeline of the low-pressure coke oven gas pipeline network; the low-pressure mixed pipeline and the incoming air pipeline of the low-pressure coke oven gas pipeline network are respectively provided with regulating valves, safety valves, temperature measuring points and pressure measuring points.

[0009] Preferably, the atmospheric pressure hydrogen production device uses an atmospheric pressure electrolyzer.

[0010] Preferably, the air inlet pipe and the air outlet pipe of the low-pressure hydrogen storage cabinet are respectively provided with a check valve.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] 1. The hydrogen storage and mixing and transportation system can utilize the existing coke oven gas and natural gas pipelines to transport hydrogen to various users. There is no need to build new hydrogen transportation pipelines, and it can be implemented quickly and at low cost.

[0013] 2. The hydrogen storage and mixing and transportation system adopts atmospheric pressure hydrogen production equipment, low-pressure hydrogen storage cabinets, and medium and low-pressure pipelines. Compared with the existing commonly used high-pressure system, the hydrogen leakage rate is significantly reduced and it has better safety.

[0014] 3. The hydrogen storage and mixing and transportation system has designed a new low-pressure hydrogen storage cabinet to meet the special needs of hydrogen. It uses a movable internal piston to adapt to the storage and transportation of hydrogen. The pressure in the piston chamber is usually close to the external atmospheric pressure, so it has high safety and reliability. In addition, due to the use of low-pressure storage, the life of the cabinet material is also significantly higher than that of high-pressure and medium-pressure containers, which is conducive to reducing equipment maintenance and replacement consumption during the use of hydrogen energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model.

[0016] In the figure: 1. Atmospheric pressure hydrogen production device; 2. Low-pressure hydrogen storage cabinet; 3. Medium-pressure mixing pipeline; 4. Low-pressure mixing pipeline. DETAILED DESCRIPTION

[0017] A hydrogen storage and mixing and delivery system, comprising an atmospheric pressure hydrogenation device 1, a low-pressure hydrogen storage cabinet 2, a medium-pressure mixing pipeline 3 and a low-pressure mixing pipeline 4, wherein the interior of the low-pressure hydrogen storage cabinet 2 is a piston chamber structure, and the movable direction of the piston is to move in the vertical direction along the inner wall of the low-pressure hydrogen storage cabinet 2, and the lower part of the piston is a hydrogen storage chamber, and the lower end of the outer side is connected to an inlet pipe and an outlet pipe, the inlet pipe is connected to the atmospheric pressure hydrogenation device 1, and the outlet pipe is divided into two ways, which are respectively connected to the medium-pressure mixing pipeline 3 and the low-pressure mixing pipeline 4, and the piston The top is used to apply downward pressure to the hydrogen storage chamber. For reference, this can be achieved by hanging a concrete counterweight block from the upper opening of the low-pressure hydrogen storage cabinet 2 and placing it on the upper end of the piston. Of course, other methods can also be adopted, such as connecting the space above the piston to the cylinder through an air inlet pipe and an air outlet pipe, and controlling the air pressure through an air compressor; a compressor is connected to the medium-pressure mixing pipeline 3, and its pipeline outlet end is connected to the air inlet of the medium-pressure mixed gas pipeline; the outlet end of the low-pressure mixing pipeline 4 is connected to the air inlet of the low-pressure mixed gas pipeline.

[0018] The above-mentioned piston generally has at least two working states. In the first working state, no counterweight is placed on the upper end of the piston, and the piston is used to store hydrogen in the hydrogen storage chamber. In the second working state, a counterweight is placed on the upper end of the piston, and the piston is used to pressurize the hydrogen in the hydrogen storage chamber through the piston. Of course, other working states can be provided according to work needs. In addition, check valves or one-way valves can be respectively provided on the air inlet pipe and the air outlet pipe of the low-pressure hydrogen storage cabinet 2 to ensure that the hydrogen does not flow back.

[0019] In a preferred embodiment, the medium-pressure mixed gas pipeline is provided with two air inlets, and the other one is connected to the incoming air pipeline of the medium-pressure natural gas pipeline network; the medium-pressure mixed gas pipeline 3 and the incoming air pipeline of the medium-pressure natural gas pipeline network are respectively provided with relevant valve groups and safety instruments, such as regulating valves, safety valves, temperature measuring points and pressure measuring points.

[0020] In a preferred embodiment, the low-pressure mixed gas pipeline is provided with two air inlets, and the other one is connected to the incoming air pipeline of the low-pressure coke oven gas network; the low-pressure mixing pipeline 4 and the incoming air pipeline of the low-pressure coke oven gas network are respectively provided with relevant valve groups and safety instruments, such as regulating valves, safety valves, temperature measuring points and pressure measuring points.

[0021] In addition, the atmospheric pressure hydrogen production device 1 can further preferably adopt an atmospheric pressure electrolyzer, which has a simpler manufacturing process and is easy to achieve large-scale. The design does not need to consider the pressure resistance problem, and the strength requirements for the end plates, frames, etc. are low, which saves material investment. There is no need to set up a pressure regulating device, and there is no leakage problem of the pressure valve. The hydrogen coming out of the atmospheric pressure electrolyzer can also undergo general separation and purification treatment.

[0022] The above are only preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope defined by the claims.

[0023] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

Claims

1. A hydrogen storage and mixing delivery system, characterized in that: The invention comprises a normal pressure hydrogen production device (1), a low-pressure hydrogen storage cabinet (2), a medium-pressure mixing pipeline (3) and a low-pressure mixing pipeline (4), wherein the interior of the low-pressure hydrogen storage cabinet (2) is a piston chamber structure, the movement direction of the piston is to move in the vertical direction along the inner wall of the low-pressure hydrogen storage cabinet (2), the lower part of the piston is a hydrogen storage chamber, the lower end of the outer side of the piston is connected to an inlet pipe and an outlet pipe, the inlet pipe is connected to the normal pressure hydrogen production device (1), the outlet pipe is divided into two parts and respectively connected to the medium-pressure mixing pipeline (3) and the low-pressure mixing pipeline (4), and the upper part of the piston is used to apply downward pressure to the hydrogen storage chamber; the medium-pressure mixing pipeline (3) is connected to a pressurizer, and the outlet end of the pipeline is connected to the air inlet of the medium-pressure mixed gas pipeline; the outlet end of the low-pressure mixing pipeline (4) is connected to the air inlet of the low-pressure mixed gas pipeline.

2. A hydrogen storage and mixing delivery system according to claim 1, characterized in that: The piston has at least two working states. In the first working state, no counterweight is placed on the upper end of the piston, and the piston is used to store hydrogen in the hydrogen storage chamber. In the second working state, a counterweight is placed on the upper end of the piston, and the piston is used to pressurize the hydrogen in the hydrogen storage chamber.

3. A hydrogen storage and mixing delivery system according to claim 1, characterized in that: The medium-pressure mixed gas pipeline is provided with two air inlets, the other of which is connected to the incoming air pipeline of the medium-pressure natural gas pipeline network; the medium-pressure mixed gas pipeline (3) and the incoming air pipeline of the medium-pressure natural gas pipeline network are respectively provided with a regulating valve, a safety valve, a temperature measuring point and a pressure measuring point.

4. A hydrogen storage and mixing delivery system according to claim 1, characterized in that: The low-pressure mixed gas pipeline is provided with two air inlets, the other of which is connected to the incoming air pipeline of the low-pressure coke oven gas pipeline network; the low-pressure mixed gas pipeline (4) and the incoming air pipeline of the low-pressure coke oven gas pipeline network are respectively provided with a regulating valve, a safety valve, a temperature measuring point and a pressure measuring point.

5. A hydrogen storage and mixing delivery system according to claim 1, characterized in that: The atmospheric pressure hydrogen production device (1) adopts an atmospheric pressure electrolyzer.

6. A hydrogen storage and mixing delivery system according to claim 1, characterized in that: The air inlet pipe and the air outlet pipe of the low-pressure hydrogen storage cabinet (2) are respectively provided with check valves.

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