Pressure stabilizing device in hydrogen production and storage process

Abstract

The utility model belongs to the technical field of hydrogen storage, and particularly relates to a pressure stabilizing device in a hydrogen production and storage process. The pressure stabilizing device in the hydrogen production and storage process comprises a raw material storage tank, a converter, a pressure stabilizing tank, a first pressure regulating assembly and a second pressure regulating assembly, the raw material storage tank conveys hydrogen production raw materials to the converter through a metering pump, and the first pressure regulating assembly and the second pressure regulating assembly are arranged between the converter and the pressure stabilizing tank in parallel. The adjusted pressure of the second pressure adjusting assembly is larger than that of the first pressure adjusting assembly; a pressure detection unit is arranged on the pressure stabilizing tank, the metering pump and the pressure detection unit are connected with a controller, the controller controls the flow of the metering pump according to the hydrogen pressure detected by the pressure detection unit, and when the pressure in the pressure stabilizing tank reaches the adjusting pressure set by the first pressure reducing valve and the pressure is continuously maintained at the pressure, the second pressure adjusting assembly is opened, and the pressure is adjusted. Hydrogen passes through the second pressure regulating assembly, and part of excessive hydrogen is stored in the pressure stabilizing tank, so that safe operation of equipment is ensured.

Description

Technical Field

[0001] This utility model belongs to the field of hydrogen storage technology, and in particular to a pressure stabilizing device in the hydrogen production and storage process. Background Technology

[0002] The hydrogen produced by the reaction of methanol and water in the converter is sent to a storage tank or pressure stabilizing tank after passing through a pressure reducing valve. In the existing technology, the pressure reducing valve is usually provided to stabilize the hydrogen pressure in the storage tank. However, since the hydrogen production process is not stable, the amount of hydrogen may rise rapidly in a short period of time. After exceeding the set pressure value, one approach is to release some of the hydrogen into the air, which is wasteful and poses a certain safety hazard. Another approach is to close the valve between the storage tank and the converter, so that the hydrogen is no longer stored in the storage tank or pressure stabilizing tank. However, the raw materials in the converter will continue to produce hydrogen. Since it is a chemical reaction, it is impossible to completely stop the production of hydrogen immediately. At this time, the pressure in the converter will gradually increase, which will also pose a safety hazard. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a pressure stabilizing device in the hydrogen production and storage process. Two pressure regulating components are provided between the converter and the storage tank. The safety redundancy of the pressure stabilizing tank is used to store a portion of the excess hydrogen and ensure the safe operation of the equipment.

[0004] The technical solution adopted by this utility model to solve its technical problem is as follows: the pressure stabilizing device in the hydrogen production and storage process includes a raw material storage tank, a converter, a pressure stabilizing tank, a first pressure regulating component and a second pressure regulating component. The raw material storage tank delivers hydrogen production raw materials to the converter through a metering pump. The first pressure regulating component and the second pressure regulating component are connected in parallel between the converter and the pressure stabilizing tank, wherein the pressure after adjustment by the second pressure regulating component is greater than the pressure after adjustment by the first pressure regulating component.

[0005] A pressure detection unit is installed on the pressure stabilizing tank. The metering pump is connected to the pressure detection unit and the controller. The controller controls the flow rate of the metering pump according to the hydrogen pressure detected by the pressure detection unit.

[0006] Preferably, the first pressure regulating assembly includes a first shut-off valve and a first pressure reducing valve arranged in series; the second pressure regulating assembly includes a second shut-off valve and a second pressure reducing valve arranged in series.

[0007] Preferably, the lower end of the pressure stabilizing tank is provided with a drain outlet.

[0008] Preferably, a safety valve is provided at the top of the pressure stabilizing tank.

[0009] Preferably, it further includes a heat exchanger and a gas-liquid separator, which are sequentially arranged between the converter and the pressure stabilizing tank, and the first pressure regulating component and the second pressure regulating component are arranged in parallel between the gas-liquid separator and the pressure stabilizing tank.

[0010] Preferably, the heat exchanger includes a heat exchanger tank, heat exchanger baffles, and a methanol flow channel. The methanol flow channel is spirally arranged inside the heat exchanger tank. Multiple heat exchanger baffles are arranged parallel to each other in the gaps of the methanol flow channel. An outlet is provided between the heat exchanger baffles and the heat exchanger tank, and the outlets between two adjacent heat exchanger baffles are staggered. The methanol flow channel has a methanol inlet and a methanol outlet. The heat exchanger tank has a hydrogen inlet and a hydrogen outlet. The methanol inlet and methanol outlet are respectively connected to a metering pump and a converter through pipelines. The hydrogen inlet and hydrogen outlet are respectively connected to a converter and a gas-liquid separator through pipelines.

[0011] Preferably, the multiple heat exchanger baffles are connected by screws.

[0012] Preferably, the gas-liquid separator includes a gas-liquid separator tank, gas-liquid separator baffles, and gas-liquid separator channels. Multiple gas-liquid separator baffles are arranged parallel to each other inside the gas-liquid separator tank. An outlet is provided between the gas-liquid separator baffles and the gas-liquid separator tank, and the outlets of two adjacent gas-liquid separator baffles are staggered. Multiple gas-liquid separator channels are vertically arranged inside the gas-liquid separator tank, passing through the gas-liquid separator baffles. The gas-liquid separator channels are provided with condensate inlets and condensate outlets. The gas-liquid separator tank is provided with hydrogen inlets and hydrogen outlets. The condensate inlets and condensate outlets are respectively connected to a water supply device and a cooling device through pipelines. The hydrogen inlets and hydrogen outlets are respectively connected to a heat exchanger and a pressure stabilizing tank through pipelines.

[0013] Compared with existing technologies, the beneficial effects of this technical solution are:

[0014] This invention incorporates a first pressure regulating component and a second pressure regulating component between the converter and the pressure stabilizing tank. The first pressure regulating component depressurizes the hydrogen generated in the converter before sending it into the pressure stabilizing tank. When the amount of hydrogen generated in the converter rises rapidly, and the pressure in the pressure stabilizing tank reaches the adjustment pressure of the first pressure regulating component, and the pressure detection unit detects that the pressure in the pressure stabilizing tank remains at a high level, the second pressure regulating component is opened to allow the overpressurized hydrogen to enter the pressure stabilizing tank, preventing a sharp rise in pressure in the converter and ensuring safe operation of the equipment. Simultaneously, a metering pump is used to adjust the raw material flow rate in a timely manner, reducing the amount of hydrogen generated in the converter and ensuring stable pressure in both the pressure stabilizing tank and the converter, thus preventing hydrogen leakage and potential hazards. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a pressure stabilizing device in the hydrogen production and storage process according to the present invention.

[0016] Figure 2 This is a cross-sectional view of the heat exchanger of this utility model.

[0017] Figure 3 This is a schematic diagram of the structure of the heat exchanger baffle and methanol flow channel of this utility model.

[0018] Figure 4 This is an exploded view of the gas-liquid separator of this utility model.

[0019] The components include: 1. Converter; 2. Pressure stabilizing tank; 3. First shut-off valve; 4. Second shut-off valve; 5. First pressure reducing valve; 6. Second pressure reducing valve; 7. Heat exchanger; 8. Heat exchanger tank; 9. Heat exchanger baffle; 10. Methanol flow channel; 11. Gas-liquid separator; 12. Gas-liquid separator tank; 13. Gas-liquid separator baffle; 14. Gas-liquid separator flow channel; 15. Pressure gauge; 16. Metering pump; 17. Raw material storage tank; 18. Water supply device; 19. Cooling device. Detailed Implementation

[0020] Figures 1-4 This is the preferred embodiment of the present invention, which is described below in conjunction with the appendix. Figures 1-4 The present invention will be further described below.

[0021] Reference Figure 1 The pressure stabilizing device in the hydrogen production and storage process includes a converter 1, a pressure stabilizing tank 2, a heat exchanger 7, a gas-liquid separator 11, a raw material storage tank 17, a water supply device 18, a first pressure regulating component, and a second pressure regulating component. The raw material storage tank 17 stores a mixture of methanol and water. The raw material storage tank 17 supplies raw material to the converter 1 through a metering pump 16. The gas-liquid separator 11 is located between the converter 1 and the pressure stabilizing tank 2. The heat exchanger 7 is located between the converter 1 and the gas-liquid separator 11. The first pressure regulating component and the second pressure regulating component are connected in parallel between the gas-liquid separator 11 and the pressure stabilizing tank 2. The first pressure regulating component includes a first shut-off valve 3 and a first pressure reducing valve 5. The second pressure regulating component includes a second shut-off valve 4 and a second pressure reducing valve 6. The adjustment pressure of the second pressure reducing valve 6 is greater than the adjustment pressure of the first pressure reducing valve 5.

[0022] The first pressure reducing valve 5 is adjusted to a pressure of 0.2 MPa, and the second pressure reducing valve 6 is adjusted to a pressure of 0.5 MPa. When the amount of hydrogen produced in the converter 1 increases rapidly, or when the pressure stabilizing tank 2 reduces or stops supplying hydrogen to the outside while the converter 1 continues to produce hydrogen, this will cause the internal pressure of the pressure stabilizing tank 2 to increase. When the pressure in the pressure stabilizing tank 2 exceeds the adjustment pressure set by the first pressure reducing valve 5, the second shut-off valve 4 is opened, and the second pressure reducing valve 6 is activated to balance the pressure in the converter 1 and the pressure stabilizing tank 2. The excess hydrogen is temporarily stored using the safety redundancy of the pressure stabilizing tank 2 until the pressure in the pressure stabilizing tank 2 drops, at which point the second shut-off valve 4 is closed.

[0023] Methanol and water in raw material storage tank 17 react in converter 1 to produce hydrogen, generating a large amount of heat. The high-temperature hydrogen enters gas-liquid separator 11 through heat exchanger 7. After being cooled by gas-liquid separator 11, the water is discharged through the drain pipe, and the hydrogen is sent to pressure stabilizing tank 2. Methanol and water in raw material storage tank 17 are preheated by absorbing heat from the high-temperature hydrogen in heat exchanger 7, and then react in converter 1 to produce hydrogen after being heated. The condensate in water supply device 18 enters gas-liquid separator 11, absorbs heat from the high-temperature hydrogen, and then enters cooling device 19.

[0024] Pressure stabilizing tank 2 is connected to pressure gauge 15, metering pump 16 is connected to raw material storage tank 17, and controller is connected to pressure gauge 15 and raw material storage tank 17. Pressure gauge 15 measures the pressure of hydrogen in pressure stabilizing tank 2. When the pressure value exceeds the preset pressure, the controller adjusts metering pump 16 to reduce the supply of raw materials, thereby reducing the production of hydrogen and ensuring the pressure in converter 1 and pressure stabilizing tank 2 is stable. Conversely, it increases the supply of raw materials and increases the production of hydrogen.

[0025] The pressure stabilizing tank 2 has a drain outlet at its bottom and a safety valve at its top. When the pressure in the pressure stabilizing tank 2 exceeds the adjustment pressure set by the second pressure regulating component, the safety valve opens to release pressure and stabilize the pressure in the pressure stabilizing tank 2. The drain outlet discharges the water from the pressure stabilizing tank 2, achieving a second gas-liquid separation.

[0026] Reference Figures 2-3 The heat exchanger 7 includes a heat exchanger tank 8, a heat exchanger baffle 9, and a methanol flow channel 10. The heat exchanger tank 8 is hollow, and the methanol flow channel 10 is spirally arranged inside the heat exchanger tank 8. Multiple heat exchanger baffles 9 are vertically interspersed in the gaps of the methanol flow channel 10, and the outlets between two adjacent heat exchanger baffles 9 are staggered.

[0027] In this embodiment, the heat exchanger baffle 9 is a circular flat plate with one side cut off to form an outlet. There are three heat exchanger baffles 9, which are fixed together by two screws. The staggered arrangement of the outlets allows hydrogen to pass through the methanol channel 10 along an S-shaped path. The methanol channel 10 has a methanol inlet and an outlet, which are connected to the metering pump 16 and the converter 1 respectively via pipelines. The heat exchanger tank 8 has a hydrogen inlet and an outlet, which are connected to the converter 1 and the gas-liquid separator 11 respectively via pipelines. Methanol enters the methanol channel 10 from the raw material storage tank 17 and flows along the methanol channel 10. High-temperature hydrogen exits from the converter 1 and enters the heat exchanger tank 8, passing through the methanol channel 10 along an S-shaped path, fully exchanging heat with the methanol in the methanol channel 10. The methanol that has absorbed some heat enters the converter 1 to react, while the hydrogen that has absorbed some heat enters the gas-liquid separator 11 for further cooling and gas-liquid separation.

[0028] Reference Figure 4 The gas-liquid separator 11 includes a gas-liquid separator tank 12, gas-liquid separator baffles 13, and gas-liquid separator flow channels 14. The gas-liquid separator tank 12 is hollow. Multiple gas-liquid separator baffles 13 are arranged vertically and parallel within the gas-liquid separator tank 12, with the outlets of adjacent gas-liquid separator baffles 13 staggered. Multiple gas-liquid separator flow channels 14 pass through the gas-liquid separator baffles 13 and are vertically arranged within the gas-liquid separator tank 12. In this embodiment, the shape of the gas-liquid separator baffles 13 is the same as that of the heat exchanger baffles 9. Each gas-liquid separator baffle 13 has multiple through holes on its surface, and the gas-liquid separator flow channels 14 pass through these through holes within the gas-liquid separator tank 12.

[0029] The gas-liquid separator flow channel 14 is equipped with a condensate inlet and outlet, which are connected to a water supply device 18 and a cooling device 19 via pipelines, respectively. The gas-liquid separator tank 12 is equipped with a hydrogen inlet and outlet, which are connected to a heat exchanger 7 and a pressure stabilizing tank 2 via pipelines, respectively. The condensate from the water supply device 18 enters the gas-liquid separator flow channel 14 and flows within it. The hydrogen entering from the heat exchanger 7 flows along an S-shaped path within the gas-liquid separator tank 12, exchanging heat with the condensate. This cools the hydrogen to room temperature before it exits and enters the pressure stabilizing tank 2 for storage. The condensate that has absorbed heat then enters the cooling device 19.

[0030] Work process:

[0031] Methanol in raw material storage tank 17 is heated and reacts with water in converter 1 to generate hydrogen. The hydrogen enters heat exchanger 7 and exchanges heat with methanol supplied by raw material storage tank 17. The hydrogen that has absorbed some heat enters gas-liquid separator 11. Condensate supplied by water supply device 18 enters gas-liquid separator 11 to cool the hydrogen. The condensate then enters cooling device 19. The hydrogen cooled to room temperature enters pressure stabilizing tank 2 for storage.

[0032] When the amount of hydrogen produced in converter 1 rises rapidly in a short period of time, the pressure of hydrogen in pressure stabilizing tank 2 increases, eventually reaching the adjustment pressure of 0.2 MPa set by the first pressure reducing valve 5. Hydrogen can no longer enter pressure stabilizing tank 2, causing the pressure in converter 1 to rise rapidly. Since the hydrogen in pressure stabilizing tank 2 will be sent to the kiln for combustion, if the pressure rises briefly, the pressure in pressure stabilizing tank 2 will quickly drop. However, when pressure gauge 15 detects that the pressure in pressure stabilizing tank 2 remains at a high level, the second shut-off valve 4 is opened, and the second pressure reducing valve 6 is used to temporarily allow excess hydrogen to enter pressure stabilizing tank 2. At the same time, the controller controls metering pump 16 to reduce the flow rate of raw materials to reduce hydrogen generation, and conversely, to increase the flow rate of raw materials to increase hydrogen generation.

[0033] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model without departing from its technical solution shall still fall within the protection scope of this utility model.

Claims

1. A pressure stabilizing device in a hydrogen production and storage process, characterized by: The system includes a raw material storage tank (17), a converter (1), a pressure stabilizing tank (2), a first pressure regulating component, and a second pressure regulating component. The raw material storage tank (17) supplies hydrogen production raw materials to the converter (1) through a metering pump (16). The first pressure regulating component and the second pressure regulating component are connected in parallel between the converter (1) and the pressure stabilizing tank (2), wherein the pressure after adjustment by the second pressure regulating component is greater than the pressure after adjustment by the first pressure regulating component. A pressure detection unit is provided on the pressure stabilizing tank (2). The metering pump (16) is connected to the controller of the pressure detection unit. The controller controls the flow rate of the metering pump (16) according to the hydrogen pressure detected by the pressure detection unit.

2. The pressure stabilizing device in a hydrogen production and storage process according to claim 1, characterized in that: The first pressure regulating assembly includes a first shut-off valve (3) and a first pressure reducing valve (5) arranged in series; the second pressure regulating assembly includes a second shut-off valve (4) and a second pressure reducing valve (6) arranged in series.

3. The pressure stabilizing device in a hydrogen production and storage process according to claim 1, characterized in that: The pressure stabilizing tank (2) is provided with a drain outlet at its lower end.

4. The pressure stabilizing device in a hydrogen production and storage process according to claim 1 or 3, characterized in that: A safety valve is provided on the upper part of the pressure stabilizing tank (2).

5. The pressure stabilizing device in a hydrogen production and storage process according to claim 1, characterized in that: It also includes a heat exchanger (7) and a gas-liquid separator (11), which are arranged sequentially between the converter (1) and the pressure stabilizing tank (2). The first pressure regulating component and the second pressure regulating component are arranged in parallel between the gas-liquid separator (11) and the pressure stabilizing tank (2).

6. The pressure stabilizing device in a hydrogen production and storage process according to claim 5, characterized in that: The heat exchanger (7) includes a heat exchanger tank (8), a heat exchanger baffle (9), and a methanol flow channel (10). The methanol flow channel (10) is spirally arranged inside the heat exchanger tank (8). Multiple heat exchanger baffles (9) are arranged in parallel in the gaps of the methanol flow channel (10). An outlet is provided between the heat exchanger baffle (9) and the heat exchanger tank (8), and the outlets between two adjacent heat exchanger baffles (9) are staggered. The methanol flow channel (10) is provided with a methanol inlet and a methanol outlet. The heat exchanger tank (8) is provided with a hydrogen inlet and a hydrogen outlet. The methanol inlet and methanol outlet are respectively connected to a metering pump (16) and a converter (1) through pipelines. The hydrogen inlet and hydrogen outlet are respectively connected to the converter (1) and a gas-liquid separator (11) through pipelines.

7. The pressure stabilizing device in a hydrogen production and storage process according to claim 6, characterized in that: The multiple heat exchanger baffles (9) are connected by screws.

8. The pressure stabilizing device in a hydrogen production and storage process according to claim 5, characterized in that: The gas-liquid separator (11) includes a gas-liquid separator tank (12), gas-liquid separator baffles (13), and gas-liquid separator flow channels (14). Multiple gas-liquid separator baffles (13) are arranged in parallel within the gas-liquid separator tank (12). An outlet is provided between the gas-liquid separator baffles (13) and the gas-liquid separator tank (12), and the outlets of adjacent gas-liquid separator baffles (13) are staggered. Multiple gas-liquid separator flow channels (14) 4) It is vertically installed inside the gas-liquid separator tank (12) through the baffle plate (13) of the gas-liquid separator. The gas-liquid separator flow channel (14) is provided with a condensate inlet and a condensate outlet. The gas-liquid separator tank (12) is provided with a hydrogen inlet and a hydrogen outlet. The condensate inlet and the condensate outlet are respectively connected to the water supply device (18) and the cooling device (19) through pipelines. The hydrogen inlet and the hydrogen outlet are respectively connected to the heat exchanger (7) and the pressure stabilizing tank (2) through pipelines.

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