Hydrogen production system with vacuum protection device

Abstract

The utility model relates to a hydrogen production system with a vacuum protection device, which is characterized in that the input end of a first passage of a heat exchange vaporization system is connected with the output end of a booster pump through a pipeline, and the input end of a tube pass of a reforming reaction furnace is connected with the output end of the first passage of the heat exchange vaporization system through a pipeline; the input end of the hydrogen purification device is connected with the output end of the tube pass of the reforming reaction furnace through a pipeline, and the input end of the hydrogen buffer tank is connected with the first output end of the hydrogen purification device through a pipeline; the vacuum suction end of the vacuum pump is connected with a pipeline between the input end of the hydrogen purification device and the output end of the tube pass of the reforming reaction furnace and a pipeline between the first output end of the hydrogen purification device and the hydrogen buffer tank through pipelines. The system reduces the safety risk in the hydrogen production process, and prevents the hydrogen embrittlement phenomenon of the device in the cooling process.

Description

Technical Field

[0001] The utility model relates to the field of hydrogen production equipment, in particular to a hydrogen production system with a vacuum protection device. Background Art

[0002] Hydrogen embrittlement is likely to form at low temperatures. After hydrogen dissolves in steel, hydrogen molecules are aggregated between steel molecules, causing local stress concentration. When the stress exceeds the strength limit of the steel, small cracks will form inside the steel, making the steel prone to fracture. When the temperature is below 95 °C, hydrogen embrittlement is likely to occur. When the temperature is between 95 and 230 °C, hydrogen embrittlement decreases with increasing temperature, and finally disappears when the temperature is above 230 °C.

[0003] Before starting up the reforming hydrogen production device, inert gas replacement is required, and nitrogen purging is also required during the shutdown and cooling process to prevent hydrogen embrittlement of the device during the cooling process. A large amount of nitrogen is consumed during use, and the nitrogen cylinder group has a large volume and needs to be refilled regularly. For some small devices, the size has too much influence and miniaturization cannot be achieved. Summary of the Utility Model

[0004] To solve the above problems, the utility model proposes a hydrogen production system with a vacuum protection device, which reduces the safety risks during hydrogen production and prevents hydrogen embrittlement of the device during the cooling process.

[0005] To achieve the above object, the technical solution adopted by the utility model is:

[0006] A hydrogen production system with a vacuum protection device, comprising:

[0007] A booster pump for supplying methanol water;

[0008] A heat exchange and vaporization system, the input end of the first path thereof is connected to the output end of the booster pump through a pipeline, and the heat exchange and vaporization system is used to heat and vaporize methanol water;

[0009] A reforming reaction furnace, the input end of the tube side of the reforming reaction furnace is connected to the output end of the first path of the heat exchange and vaporization system through a pipeline;

[0010] A hydrogen purification device, the input end of which is connected to the output end of the tube side of the reforming reaction furnace through a pipeline. The hydrogen purification device has two output ends. The first output end of the hydrogen purification device is the hydrogen output end, and the second output end of the hydrogen purification device is the tail gas output end;

[0011] A hydrogen buffer tank, the input end of which is connected to the first output end of the hydrogen purification device through a pipeline;

[0012] A vacuum pump, whose vacuum suction end is connected through pipelines to the pipeline between the input end of the hydrogen purification device and the output end of the tube side of the reforming reaction furnace, and the pipeline between the first output end of the hydrogen purification device and the hydrogen buffer tank. The vacuum pump is used to evacuate the hydrogen pipeline and the vaporized methanol-water raw material pipeline.

[0013] Preferably, the vacuum suction end of the vacuum pump is connected through a first vacuum pipeline to the pipeline between the input end of the hydrogen purification device and the output end of the tube side of the reforming reaction furnace, and a first valve is installed on the first vacuum pipeline.

[0014] Preferably, the vacuum suction end of the vacuum pump is connected through a second vacuum pipeline to the pipeline between the first output end of the hydrogen purification device and the hydrogen buffer tank, and a second valve is installed on the second vacuum pipeline.

[0015] Preferably, a cooler is further provided on the second vacuum pipeline, and the cooler is used to cool down the vaporized methanol-water.

[0016] Preferably, the heat exchange and vaporization system includes a heat exchanger and a vaporizer. The output end of the booster pump is connected through a pipeline to the input end of the first passage of the heat exchanger. The output end of the first passage of the heat exchanger is connected through a pipeline to the input end of the first passage of the vaporizer. The output end of the first passage of the heat exchanger is connected through a pipeline to the input end of the tube side of the reforming reaction furnace.

[0017] Preferably, the hydrogen production system of the vacuum protection device further includes a tail gas oxidation furnace. The first input end of the tail gas oxidation furnace is connected through a pipeline to the second output end of the hydrogen purification device

[0018] Preferably, the output end of the tail gas oxidation furnace is connected through a pipeline to the input end of the shell side of the reforming reaction furnace.

[0019] Preferably, the output end of the shell side of the reforming reaction furnace is connected to the input end of the second passage of the vaporizer.

[0020] Preferably, the first output end of the hydrogen purification device is connected through a pipeline to the output end of the second passage of the heat exchanger.

[0021] Preferably, the second input end of the tail gas oxidation furnace is an air input end, and a blower is connected to the second input end of the tail gas oxidation furnace.

[0022] The beneficial effects of using the present utility model are:

[0023] The hydrogen production system of this vacuum protection device is connected through the vacuum suction end of the vacuum pump to the pipeline between the input end of the hydrogen purification device and the output end of the tube side of the reforming reaction furnace, as well as the pipeline between the first output end of the hydrogen purification device and the hydrogen buffer tank, to evacuate the finished product hydrogen pipeline and the raw material gas pipeline. The evacuation process can more thoroughly remove the gas in the system and avoid the interference of residual gas on the production process. Compared with inert gas replacement, evacuation is usually more economical, reducing the usage cost of equipment and gas and lowering the production cost. Description of the Drawings

[0024] Figure 1 It is a schematic diagram of a hydrogen production system with a vacuum protection device.

[0025] The reference numerals include:

[0026] 1 - Booster pump, 2 - Heat exchanger, 3 - Vaporizer, 4 - Reforming reaction furnace, 5 - Hydrogen purification device, 6 - Tail gas oxidation furnace, 7 - Blower, 8 - Air source, 9 - Hydrogen buffer tank, 10 - Vacuum pump, 11 - First vacuum pipeline, 12 - First valve, 13 - Second vacuum pipeline, 14 - Second valve, 15 - Cooler. Detailed Embodiments

[0027] To make the objectives, technical solutions, and advantages of the present technical solution clearer and more understandable, the present technical solution will be further described in detail below in conjunction with specific embodiments. It should be understood that these descriptions are exemplary and not intended to limit the scope of the present technical solution.

[0028] To solve the problem that hydrogen remains in the equipment and pipelines of the hydrogen production system in the prior art, resulting in the occurrence of hydrogen embrittlement phenomenon during the cooling process, as Figure 1 shown, this embodiment proposes a hydrogen production system with a vacuum protection device. The raw material input end of this hydrogen production system is the booster pump 1. The booster pump 1 boosts the methanol-water raw material into the first passage of the heat exchanger 2. After the methanol-water is heated and temperature-increased through the heat exchanger 2, it is output to the first passage of the vaporizer 3, and undergoes a second temperature increase through the vaporizer 3. The methanol-water is converted from a liquid state to a high-temperature and high-pressure gaseous state, and then the gaseous methanol-water is input into the tube side of the reforming reaction furnace 4 for reforming reaction, and the generated gases are hydrogen, carbon monoxide, carbon dioxide, water vapor, etc.

[0029] A mixed gas containing hydrogen, carbon monoxide, carbon dioxide, water vapor, etc. is input into the hydrogen purification device 5. The hydrogen purification device 5 can filter and separate hydrogen and other gases from the above-mentioned mixed gas. The hydrogen is transported through a pipeline to the second passage of the heat exchanger 2, and the remaining heat of the hydrogen provides heat for heat exchange of the heat exchanger 2. The other gases separated except hydrogen are output to the tail gas oxidation furnace 6 through another pipeline. The tail gas oxidation furnace 6 inputs air through the blower 7 and the air source 8, and then fully oxidizes the other gases. A large amount of heat is released during the oxidation process. The tail gas is first input into the shell side of the reforming reaction furnace 4. Since the methanol-water reforming reaction is an endothermic reaction, the heat carried by the tail gas can provide heat for the reforming reaction furnace 4. The gas output from the shell side of the reforming reaction furnace 4 is then transported to the second passage of the vaporizer 3 as the heat source of the vaporizer 3.

[0030] In this embodiment, the vacuum suction end of the vacuum pump 10 is connected through a pipeline to the pipeline between the input end of the hydrogen purification device 5 and the output end of the tube side of the reforming reaction furnace 4, and the pipeline between the first output end of the hydrogen purification device 5 and the hydrogen buffer tank 9. The vacuum pump 10 is used to evacuate the hydrogen pipeline and the vaporized methanol-water raw material pipeline. Using vacuum evacuation instead of inert gas replacement can effectively avoid the safety risk of mixing hydrogen with oxygen, etc., and reduce the risk of explosion or fire. The process of vacuum evacuation is relatively simple, without the need for additional inert gas equipment, and is more convenient to operate.

[0031] There is no longer a need to use inert gas, reducing the impact on the environment and conforming to the concept of green production.

[0032] The vacuum suction end of the vacuum pump 10 is connected through the first vacuum pipeline 11 to the pipeline between the input end of the hydrogen purification device 5 and the output end of the tube side of the reforming reaction furnace 4, and a first valve 12 is installed on the first vacuum pipeline 11. Similarly, the vacuum suction end of the vacuum pump 10 is connected through the second vacuum pipeline 13 to the pipeline between the first output end of the hydrogen purification device 5 and the hydrogen buffer tank 9, and a second valve 14 is installed on the second vacuum pipeline 13. The first valve 12 and the second valve 14 can switch the opening and closing timing of the first vacuum pipeline 11 and the second vacuum pipeline 13, and can selectively evacuate the target equipment and pipelines.

[0033] The vaporized methanol-water pipeline is in a high-temperature and high-pressure working condition during hydrogen production. Once the machine is stopped and evacuated, an air cooler or a water cooler needs to be added. Therefore, a cooler 15 is also provided on the second vacuum pipeline 13, and the cooler 15 is used to cool down the vaporized methanol-water.

[0034] Changing the on-off atmosphere gas replacement method of the reforming hydrogen production device to vacuum evacuation in this system helps to improve safety, operation convenience, is more efficient and thorough technically, also conforms to the environmental protection concept, can bring more technical and economic advantages, and is conducive to the miniaturization of equipment.

[0035] The above content is only a preferred embodiment of the present utility model. For those of ordinary skill in the art, based on the idea of the present technical content, many changes can be made in the specific implementation manner and application scope. As long as these changes do not depart from the concept of the present utility model, they all fall within the protection scope of this patent.

Claims

1. A hydrogen production system with a vacuum protection device, characterized in that: Comprising: A booster pump for supplying methanol water; A heat exchange and vaporization system, the input end of the first passage of which is connected to the output end of the booster pump through a pipeline, and the heat exchange and vaporization system is used to heat and vaporize methanol water; A reforming reaction furnace, the input end of the tube side of the reforming reaction furnace is connected to the output end of the first passage of the heat exchange and vaporization system through a pipeline; A hydrogen purification device, the input end of which is connected to the output end of the tube side of the reforming reaction furnace through a pipeline, the hydrogen purification device has two output ends, the first output end of the hydrogen purification device is a hydrogen output end, and the second output end of the hydrogen purification device is a tail gas output end; A hydrogen buffer tank, the input end of which is connected to the first output end of the hydrogen purification device through a pipeline; A vacuum pump, the vacuum suction end of which is connected through a pipeline to the pipeline between the input end of the hydrogen purification device and the output end of the tube side of the reforming reaction furnace, and the pipeline between the first output end of the hydrogen purification device and the hydrogen buffer tank, and the vacuum pump is used to evacuate the hydrogen pipeline and the vaporized methanol water raw material pipeline.

2. The hydrogen production system with a vacuum protection device according to claim 1, characterized in that: The vacuum suction end of the vacuum pump is connected to the pipeline between the input end of the hydrogen purification device and the output end of the tube side of the reforming reaction furnace through a first vacuum pipeline, and a first valve is installed on the first vacuum pipeline.

3. The hydrogen production system with a vacuum protection device according to claim 1, wherein: The vacuum suction end of the vacuum pump is connected to the pipeline between the first output end of the hydrogen purification device and the hydrogen buffer tank through a second vacuum pipeline, and a second valve is installed on the second vacuum pipeline.

4. The hydrogen production system with a vacuum protection device according to claim 3, characterized in that: A cooler is further provided on the second vacuum pipeline, and the cooler is used to cool the vaporized methanol water.

5. The hydrogen production system with a vacuum protection device according to claim 1, characterized in that: The heat exchange and vaporization system includes a heat exchanger and a vaporizer, the output end of the booster pump is connected to the input end of the first passage of the heat exchanger through a pipeline, the output end of the first passage of the heat exchanger is connected to the input end of the first passage of the vaporizer through a pipeline, and the output end of the first passage of the heat exchanger is connected to the input end of the tube side of the reforming reaction furnace through a pipeline.

6. The hydrogen production system with a vacuum protection device according to claim 5, characterized in that: The hydrogen production system of the vacuum protection device further includes a tail gas oxidation furnace, and the first input end of the tail gas oxidation furnace is connected to the second output end of the hydrogen purification device through a pipeline.

7. The hydrogen production system with a vacuum protection device according to claim 6, characterized in that: The output end of the tail gas oxidation furnace is connected to the input end of the shell side of the reforming reaction furnace through a pipeline.

8. The hydrogen production system with a vacuum protection device according to claim 7, wherein: The output end of the shell side of the reforming reaction furnace is connected to the input end of the second passage of the vaporizer.

9. The hydrogen production system with a vacuum protection device according to claim 5, characterized in that: The first output end of the hydrogen purification device is connected to the output end of the second passage of the heat exchanger through a pipeline.

10. The hydrogen production system with a vacuum protection device according to claim 5, characterized in that: The second input end of the tail gas oxidation furnace is an air input end, and a blower is connected to the second input end of the tail gas oxidation furnace.

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