Hydrogen concentration pressurized delivery device

Abstract

The utility model relates to a kind of hydrogen concentration pressurization conveying device, including raw material air conveying pipe, molecular sieve adsorption tank is communicated on raw material air conveying pipe, palladium catalyst reactor is equipped on raw material air conveying pipe, low-pressure buffer tank is communicated on molecular sieve adsorption tank, purified hydrogen conveying pipe is communicated with low-pressure main pipe, low-pressure main pipe is communicated with high-pressure main pipe, pressurizing device is equipped between high-pressure main pipe and low-pressure main pipe, pressurizing device includes pressurization conveying pipe, first stop valve, compressor unit, first pressure relief pipe, first check valve and second stop valve, first regulating valve is equipped on first pressure relief pipe, second pressure relief pipe is equipped on first pressure relief pipe, high-pressure buffer tank is communicated on second pressure relief pipe, pressure reduction conveying pipe is equipped between high-pressure buffer tank and low-pressure main pipe, second regulating valve is arranged on pressure reduction conveying pipe. It can change the small amount of oxygen contained in hydrogen and can use the hydrogen discharged by pressure relief. The utility model is convenient to use, and has wide market prospect.

Description

Technical Field

[0001] This utility model relates to the field of hydrogen enrichment and pressurization conveying equipment, specifically to a hydrogen enrichment and pressurization conveying device. Background Technology

[0002] In recent years, my country has encouraged the development of hydrogen production through water electrolysis. However, compared to coal-based hydrogen production, water electrolysis still presents carbon dioxide emissions issues because my country's power grid remains heavily reliant on coal-fired power generation. Therefore, promoting green hydrogen energy development requires the coupling of renewable energy sources such as wind and solar power with water electrolysis. Furthermore, hydrogen gas suffers from high storage and transportation costs, a wide explosive range, and low safety. Ammonia (NH3), as a highly efficient hydrogen storage medium, has lower storage and transportation costs than liquid hydrogen. Under the same temperature and pressure conditions, its energy density is significantly higher than that of hydrogen gas, making it a potential alternative carrier for future clean energy. Simultaneously, ammonia is an important raw material for fertilizer production and a fundamental raw material for both inorganic and organic chemical industries. After synthesizing ammonium salts, it is used to produce synthetic fibers and resins. Compared to traditional processes that utilize water gas to produce hydrogen and then ammonia, water electrolysis significantly reduces greenhouse gas emissions and decreases dependence on fossil fuels.

[0003] Hydrogen produced by water electrolysis is subject to limitations in the process itself. The finished hydrogen gas output is prone to contain oxygen. If the hydrogen from water electrolysis is to be used as a feedstock for ammonia synthesis, it must be pressurized to meet the pressure requirements of the ammonia synthesis process. Therefore, the oxygen in the hydrogen produced by water electrolysis must be replaced to avoid safety hazards caused by excessively high local oxygen content in the pressurized hydrogen. Furthermore, because the compressor unit is affected by peak electricity consumption, especially during off-peak hours at night, it is easy for the compressor unit's output power to be too high, resulting in excessively high pressurized hydrogen pressure. Current technology typically addresses this problem by depressurizing the pressurized hydrogen through a pressure relief pipeline to ensure that the pressurized hydrogen is within a preset range. The depressurized hydrogen is then transported to an industrial flare for incineration to achieve clean emissions. However, not all enterprises possess industrial flares, and the hydrogen released during pressure relief is, after all, a product for which energy costs have already been paid. Therefore, the rational recycling and utilization of this hydrogen is undoubtedly a means of energy conservation and cost reduction, thereby lowering enterprise costs. Thus, existing technologies exist that can improve air quality, aiming to address the issue of converting the small amount of oxygen contained in hydrogen produced by water electrolysis and to rationally utilize the hydrogen released during pressure relief, thereby meeting market demand. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a hydrogen enrichment and pressurization conveying device that can transform the small amount of oxygen contained in hydrogen produced by water electrolysis and can make reasonable use of the hydrogen released by pressure relief, thereby overcoming the deficiencies in existing technologies.

[0005] The technical solution adopted by this utility model is as follows: a hydrogen enrichment and pressurization conveying device, including a raw material air conveying pipe, a molecular sieve adsorption tank connected to the outlet end of the raw material air conveying pipe, a molecular sieve layer disposed inside the molecular sieve adsorption tank, a palladium catalyst reactor disposed on the raw material air conveying pipe, a purified hydrogen conveying pipe connected to the molecular sieve adsorption tank, a low-pressure buffer tank disposed on the purified hydrogen conveying pipe, a low-pressure main pipe connected to the purified hydrogen conveying pipe, a high-pressure main pipe connected to the low-pressure main pipe, and a pressurization device disposed between the high-pressure main pipe and the low-pressure main pipe, the pressurization device comprising a low-pressure main pipe and a high-pressure main pipe. The system includes a pressurization pipeline and, along the direction from the low-pressure main pipe to the high-pressure main pipe, a first shut-off valve, a compressor unit, the inlet end of a first pressure relief pipe, a first check valve, and a second shut-off valve, arranged sequentially. Several pressurization devices are connected in parallel. Each first pressure relief pipe is equipped with a first regulating valve. Second pressure relief pipes are connected to the outlet ends of the first pressure relief pipes. A high-pressure buffer tank is connected to the outlet end of each second pressure relief pipe. A pressure-reducing pipeline is connected between the high-pressure buffer tank and the low-pressure main pipe, and a second regulating valve is installed on the pressure-reducing pipeline.

[0006] Preferably, a third pressure relief pipe is provided between the high-pressure main pipe and the high-pressure buffer tank, a fourth shut-off valve is provided on the third pressure relief pipe, a second check valve is provided on the third pressure relief pipe between the fourth shut-off valve and the high-pressure buffer tank, the outlet ends of the third pressure relief pipe and the fourth shut-off valve are connected, and a third regulating valve is provided on the purified hydrogen delivery pipe between the low-pressure main pipe and the low-pressure buffer tank.

[0007] Preferably, a first pressure sensor is provided on each of the low-pressure buffer tank, the low-pressure main pipe, the high-pressure main pipe, and the high-pressure buffer tank.

[0008] Preferably, a first online chromatograph is installed on both the inlet end of the raw material air delivery pipe and the raw material air delivery pipe between the palladium catalyst reactor and the purified hydrogen delivery pipe.

[0009] Preferably, the number of molecular sieve adsorption tanks is several. Each molecular sieve adsorption tank has a first connecting pipe between its inlet end and the outlet end of the raw material air conveying pipe, a second connecting pipe between its outlet end and the purified hydrogen conveying pipe, an outlet end of a third connecting pipe corresponding to the inlet end of each molecular sieve adsorption tank, an inlet end of a fourth connecting pipe corresponding to the outlet end of each molecular sieve adsorption tank, a nitrogen conveying pipe connected to the inlet end of each third connecting pipe, a tail gas conveying pipe connected to the outlet end of each fourth connecting pipe, and a third shut-off valve connected to each of the first, second, third, and fourth connecting pipes.

[0010] Preferably, a temperature sensor and an electric heater are sequentially arranged on the nitrogen delivery pipe along the direction from near the third connecting pipe to away from the third connecting pipe, and a second online chromatograph is arranged on the exhaust gas delivery pipe.

[0011] Preferably, the pressurizing device further includes a second pressure sensor installed on the pressurizing delivery pipe between the inlet end of the first pressure relief pipe and the first one-way valve.

[0012] The beneficial effects of this invention are as follows: First, this invention utilizes a palladium catalyst reactor to convert the small amount of oxygen contained in the hydrogen produced by water electrolysis into water, and then concentrates the hydrogen produced by water electrolysis through adsorption by the molecular sieve layer in the molecular sieve adsorption tank. Furthermore, the high-pressure buffer tank of this product can accept hydrogen released from pressure relief, and then the released hydrogen is sent back to the low-pressure main pipe, pressurized by the pressurizing device in operation, and then delivered to the target user through the high-pressure main pipe, thus achieving rational utilization of the released hydrogen and reducing the hydrogen emission rate.

[0013] Secondly, the low-pressure buffer tank, low-pressure main pipe, high-pressure main pipe and high-pressure buffer tank described in this utility model are each equipped with a first pressure sensor; the installation of the first pressure sensor facilitates the feedback of pressure parameters.

[0014] Furthermore, the raw material air delivery pipe and the purified hydrogen delivery pipe between the inlet end of the raw material air delivery pipe and the palladium catalyst reactor described in this utility model are each equipped with a first online chromatograph; the installation of the first online chromatograph facilitates the feedback of component parameters.

[0015] This utility model has a simple structure, is easy to operate, and has a clever design, which greatly improves work efficiency and has good social and economic benefits. It is a product that is easy to promote and use. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0017] like Figure 1 As shown, a hydrogen enrichment and pressurization conveying device includes a raw material air conveying pipe 1, with a molecular sieve adsorption tank 2 connected to the outlet end of the raw material air conveying pipe 1. A molecular sieve layer 3 is disposed inside the molecular sieve adsorption tank 2. A palladium catalyst reactor 4 is disposed on the raw material air conveying pipe 1. A purified hydrogen conveying pipe 5 is connected to the molecular sieve adsorption tank 2. A low-pressure buffer tank 6 is disposed on the purified hydrogen conveying pipe 5. A low-pressure main pipe 7 is connected to the purified hydrogen conveying pipe 5. A high-pressure main pipe 8 is connected to the low-pressure main pipe 7. A pressurization device is disposed between the high-pressure main pipe 8 and the low-pressure main pipe 7. The pressurization device includes a pressurization conveying pipe 9 disposed on the low-pressure main pipe 7 and the high-pressure main pipe 8, and a pressurization feed... The feed pipe 9 is arranged in sequence along the direction from the low-pressure main pipe 7 to the high-pressure main pipe 8, including a first shut-off valve 10, a compressor unit 11, the inlet end of the first pressure relief pipe 12, a first check valve 13, and a second shut-off valve 14. The pressurizing device is a plurality of such devices, which are connected in parallel. Each first pressure relief pipe 12 is provided with a first regulating valve 15. The outlet ends of the plurality of first pressure relief pipes 12 are provided with second pressure relief pipes 16. The outlet end of the second pressure relief pipes 16 is connected to a high-pressure buffer tank 17. A pressure reducing conveying pipe 18 is provided between the high-pressure buffer tank 17 and the low-pressure main pipe 7. A second regulating valve 19 is provided on the pressure reducing conveying pipe 18.

[0018] To ensure the safe use of the high-pressure main pipe 8 and facilitate pressure relief, a third pressure relief pipe 20 is installed between the high-pressure main pipe 8 and the high-pressure buffer tank 17. A fourth shut-off valve 21 is installed on the third pressure relief pipe 20. A second check valve 22 is installed on the third pressure relief pipe 20 between the fourth shut-off valve 21 and the high-pressure buffer tank 17. The outlet ends of the third pressure relief pipe 20 and the second pressure relief pipe 16 between the second check valve 22 and the fourth shut-off valve 21 are connected. A third regulating valve 23 is installed on the purified hydrogen delivery pipe 5 between the low-pressure main pipe 7 and the low-pressure buffer tank 6. When the pressure in the high-pressure main pipe 8 exceeds the preset range, pressure is relieved through the third pressure relief pipe 20. The relieved hydrogen enters the high-pressure buffer tank 17, which then gradually delivers the hydrogen to the low-pressure main pipe 7. After being repressurized by the pressurizing device, the hydrogen is delivered to the user through the high-pressure main pipe 8. Each of the low-pressure buffer tank 6, low-pressure main pipe 7, high-pressure main pipe 8 and high-pressure buffer tank 17 is equipped with a first pressure sensor 24; the installation of the first pressure sensor 24 facilitates the feedback of pressure parameters.

[0019] The pressurization device also includes a second pressure sensor 36 installed on the pressurization delivery pipe 9 between the inlet end of the first pressure relief pipe 12 and the first one-way valve 13. Installing the second pressure sensor 36 facilitates the feedback of pressure parameters. A first online chromatograph 25 is installed on both the inlet end of the raw material air delivery pipe 1 and the raw material air delivery pipe 1 between the palladium catalyst reactor 4 and the purified hydrogen delivery pipe 5; installing the first online chromatograph 25 facilitates the feedback of component parameters.

[0020] To facilitate the continuous adsorption of hydrogen gas after conversion by palladium catalyst reactor 4, thereby removing the water generated after conversion, the molecular sieve adsorption tanks 2 of this product are arranged in multiple units. Each molecular sieve adsorption tank 2 has a first connecting pipe 26 between its inlet end and the outlet end of the raw material air conveying pipe 1, and a second connecting pipe 27 between its outlet end and the purified hydrogen conveying pipe 5. The inlet end of each molecular sieve adsorption tank 2 is correspondingly provided with the outlet end of a third connecting pipe 28, and the outlet end of each molecular sieve adsorption tank 2 is correspondingly provided with the inlet end of a fourth connecting pipe 29. The inlet end of each third connecting pipe 28 is provided with a nitrogen conveying pipe 30, and the outlet end of each fourth connecting pipe 29 is provided with a tail gas conveying pipe 31. Each of the first connecting pipe 26, the second connecting pipe 27, the third connecting pipe 28, and the fourth connecting pipe 29 is respectively provided with a third shut-off valve 32. Furthermore, to facilitate the desorption of water adsorbed by the molecular sieve layer 3 in the molecular sieve adsorption tank 2, this product has a temperature sensor 33 and an electric heater 34 sequentially installed on the nitrogen delivery pipe 30 along the direction from near to away from the third connecting pipe 28, and a second online chromatograph 35 installed on the tail gas delivery pipe 31. Thus, the low-pressure nitrogen received by the nitrogen delivery pipe 30 is heated by the electric heater 34 as the desorption gas. The temperature sensor 33 is installed to facilitate feedback on the temperature of the desorption gas, while the second online chromatograph 35 facilitates feedback on the component parameters of the desorption gas.

[0021] The usage instructions for this product are as follows: Figure 1 As shown, it includes the following steps: S1. Hydrogen containing a small amount of oxygen is continuously produced in the electrolytic cell via the raw material air delivery pipe 1. After entering the raw material air delivery pipe 1, the hydrogen containing a small amount of oxygen is converted into water-containing hydrogen by the palladium catalyst reactor 4. The water-containing hydrogen is then transported to the molecular sieve adsorption tank 2, which is in operation, to remove the carried moisture and form concentrated hydrogen. Then, the concentrated hydrogen is transported to the low-pressure buffer tank 6 for buffering after the first online chromatograph 25 on the purified hydrogen delivery pipe 5 provides feedback on the component parameters.

[0022] S2. The low-pressure buffer tank 6 continuously supplies concentrated hydrogen to the low-pressure main pipe 7. The low-pressure main pipe 7 supplies concentrated hydrogen to the pressurizing device in operation. After being pressurized by the pressurizing device in operation, high-pressure hydrogen is formed and delivered to the target user through the high-pressure main pipe 8.

[0023] During this period, if an emergency shutdown is required for the downstream process, the pressure in the low-pressure main pipe 7 and the low-pressure buffer tank 6 will still be low. However, it will still need to receive concentrated hydrogen from the molecular sieve adsorption tank 2 for a short time. In order to protect the high-pressure main pipe 8 and to prevent the concentrated hydrogen from flowing back, this product opens the fourth shut-off valve 21 to temporarily store the hydrogen in the high-pressure main pipe 8 in the high-pressure buffer tank 17. After the downstream danger is eliminated, the low-pressure main pipe 7 and the low-pressure buffer tank 6 can still continuously receive the concentrated hydrogen from the molecular sieve adsorption tank 2. The high-pressure buffer tank 17 will slowly and continuously supply the hydrogen discharged from the first pressure relief of the low-pressure main pipe 7. The hydrogen discharged from the first pressure relief, along with the concentrated hydrogen transported through the purified hydrogen transport pipe 5, will be pressurized again by the pressurizing device in operation and then transported to the target user through the high-pressure main pipe 8.

[0024] When the pressure parameter fed back by the second pressure sensor 36 of the pressurizing device in operation exceeds the preset range, the corresponding first regulating valve 15 needs to be opened to release pressure through the first pressure relief pipe 12 of the pressurizing device in operation. The hydrogen gas released by the pressure relief is transported to the high-pressure buffer tank 17 through the second pressure relief pipe 16, and the high-pressure buffer tank 17 slowly and continuously supplies the hydrogen gas released by the second pressure relief pipe 7 to the low-pressure main pipe 7.

[0025] In steps S1 to S2, when the parameters fed back by the first online chromatograph 25 on the purified hydrogen delivery pipe 5 are abnormal, or when the molecular sieve adsorption tank 2 in working condition reaches its service life, the molecular sieve adsorption tank 2 in standby condition should be connected between the purified hydrogen delivery pipe 5 and the raw material air delivery pipe 1 immediately. The molecular sieve adsorption tank 2 in standby condition will then become the molecular sieve adsorption tank 2 in working condition, and the molecular sieve adsorption tank 2 in working condition will become the molecular sieve adsorption tank 2 in the desorption state. The molecular sieve adsorption tank 2 in the desorption state needs to be regenerated by the molecular sieve layer 3 before it can be put back into use, specifically including the following steps: The nitrogen delivery pipe 30 receives low-pressure nitrogen from the low-pressure nitrogen pipeline network. The low-pressure nitrogen enters the nitrogen delivery pipe 30 and is heated by the electric heater 34 to form heated nitrogen, which is then delivered to the molecular sieve layer 3 within the molecular sieve adsorption tank 2 in its desorption state. During this process, water adsorbed in the molecular sieve layer 3 continuously evaporates and, along with the heated nitrogen delivered by the nitrogen delivery pipe 30, is delivered to the tail gas delivery pipe 31. After receiving component parameters from the second online chromatograph 35, the gas is vented. When the component parameters from the second online chromatograph 35 reach a preset range, the electric heater 34 is turned off, and the nitrogen delivery pipe 30 stops receiving low-pressure nitrogen from the low-pressure nitrogen pipeline network. At this point, the molecular sieve adsorption tank 2 in its desorption state transitions to a standby state.

[0026] This embodiment achieves the conversion of a small amount of oxygen contained in hydrogen produced by water electrolysis into water using a palladium catalyst reactor 4. The water is then concentrated by adsorption with the molecular sieve layer 3 in the molecular sieve adsorption tank 2. Furthermore, the high-pressure buffer tank 17 of this product can accept hydrogen released from pressure relief, which is then re-transported to the low-pressure main pipe 7, pressurized by the pressurizing device in operation, and then delivered to the target user via the high-pressure main pipe 8. This achieves the rational utilization of hydrogen released from pressure relief and reduces the hydrogen emission rate.

[0027] The embodiments described above are merely preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the patent claims of this utility model should be included within the scope of the patent application of this utility model.

Claims

1. A hydrogen enrichment and pressurization conveying device, characterized in that: The system includes a raw material air delivery pipe (1), with a molecular sieve adsorption tank (2) connected to the outlet end of the raw material air delivery pipe (1). A molecular sieve layer (3) is provided inside the molecular sieve adsorption tank (2). A palladium catalyst reactor (4) is provided on the raw material air delivery pipe (1). A purified hydrogen delivery pipe (5) is connected to the molecular sieve adsorption tank (2). A low-pressure buffer tank (6) is provided on the purified hydrogen delivery pipe (5). A low-pressure main pipe (7) is connected to the purified hydrogen delivery pipe (5). A high-pressure main pipe (8) is connected to the low-pressure main pipe (7). A pressurizing device is provided between the high-pressure main pipe (8) and the low-pressure main pipe (7). The pressurizing device includes a pressurizing delivery pipe (9) provided on the low-pressure main pipe (7) and the high-pressure main pipe (8), and the pressurizing delivery pipe (9) extends along... A first shut-off valve (10), a compressor unit (11), the inlet end of a first pressure relief pipe (12), a first check valve (13), and a second shut-off valve (14) are sequentially arranged in the direction from the low-pressure main pipe (7) to the high-pressure main pipe (8). The pressurizing device is a number of devices connected in parallel. Each first pressure relief pipe (12) is provided with a first regulating valve (15). A second pressure relief pipe (16) is provided at the outlet end of each first pressure relief pipe (12). A high-pressure buffer tank (17) is connected to the outlet end of the second pressure relief pipe (16). A pressure reducing conveying pipe (18) is provided between the high-pressure buffer tank (17) and the low-pressure main pipe (7). A second regulating valve (19) is provided on the pressure reducing conveying pipe (18).

2. The hydrogen enrichment and pressurization conveying device according to claim 1, characterized in that: A third pressure relief pipe (20) is provided between the high pressure main pipe (8) and the high pressure buffer tank (17). A fourth shut-off valve (21) is provided on the third pressure relief pipe (20). A second check valve (22) is provided on the third pressure relief pipe (20) between the fourth shut-off valve (21) and the high pressure buffer tank (17). The outlet end of the third pressure relief pipe (20) between the second check valve (22) and the fourth shut-off valve (21) is connected to the outlet end of the second pressure relief pipe (16). A third regulating valve (23) is provided on the purified hydrogen delivery pipe (5) between the low pressure main pipe (7) and the low pressure buffer tank (6).

3. The hydrogen enrichment and pressurization conveying device according to claim 1, characterized in that: The low-pressure buffer tank (6), low-pressure main pipe (7), high-pressure main pipe (8) and high-pressure buffer tank (17) are each equipped with a first pressure sensor (24).

4. The hydrogen enrichment and pressurization conveying device according to claim 1, characterized in that: A first online chromatograph (25) is installed on the raw material air delivery pipe (1) between the inlet end of the raw material air delivery pipe (1) and the palladium catalyst reactor (4) and the purified hydrogen delivery pipe (5).

5. The hydrogen enrichment and pressurization conveying device according to claim 1, characterized in that: The number of molecular sieve adsorption tanks (2) is several. A first connecting pipe (26) is provided between the inlet end of each molecular sieve adsorption tank (2) and the outlet end of the raw material air conveying pipe (1). A second connecting pipe (27) is provided between the outlet end of each molecular sieve adsorption tank (2) and the purified hydrogen conveying pipe (5). The outlet end of a third connecting pipe (28) is provided on the inlet end of each molecular sieve adsorption tank (2). The inlet end of a fourth connecting pipe (29) is provided on the outlet end of each molecular sieve adsorption tank (2). A nitrogen conveying pipe (30) is provided on the inlet end of each third connecting pipe (28). A tail gas conveying pipe (31) is provided on the outlet end of each fourth connecting pipe (29). A third shut-off valve (32) is provided on each of the first connecting pipe (26), the second connecting pipe (27), the third connecting pipe (28), and the fourth connecting pipe (29).

6. The hydrogen enrichment and pressurization conveying device according to claim 5, characterized in that: A temperature sensor (33) and an electric heater (34) are sequentially arranged on the nitrogen delivery pipe (30) along the direction from near the third connecting pipe (28) to away from the third connecting pipe (28), and a second online chromatograph (35) is arranged on the tail gas delivery pipe (31).

7. The hydrogen enrichment and pressurization conveying device according to claim 1, characterized in that: The pressurizing device also includes a second pressure sensor (36) installed on the pressurizing delivery pipe (9) between the inlet end of the first pressure relief pipe (12) and the first one-way valve (13).

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