A three-connected circulating dehydration reactor assembly for hydrogen production by electrolysis

Abstract

A three-connected circulating dehydration reactor group for electrolytic hydrogen production, wherein the dehydration reactor group is vertically provided with three dehydration reactors of the same type, wherein valve groups are provided at both upper and lower ends of the dehydration reactor, wherein the valve group at the upper end is connected to a defogger inlet pipeline, a straight-through inlet pipeline and a reverse outlet pipeline, and the valve group at the lower end is connected to a reverse inlet pipeline, a defogger outlet pipeline and a straight-through outlet pipeline, wherein the valve group comprises two three-way valves vertically arranged in series and connected to each other, wherein one port of the outer three-way valve is connected to one port of the inner three-way valve, and a small number of valves and equipment can be combined to realize the production of high-purity hydrogen, and compared with traditional hydrogen production and purification equipment, the number of equipment can be reduced by more than 25%, the number of valves can be reduced by more than 35%, and the weight can be reduced by more than 20%, thereby significantly reducing the production cost and floor space, and improving the equipment stability and adaptability to the on-site installation environment.

Description

Technical Field

[0001] The present invention belongs to the technical field of gas purification reactor groups, and specifically relates to a three-connected circulating dehydration reactor group for hydrogen production by electrolysis. Background Art

[0002] At present, the widely used methods in the field of gas purification are pressure swing adsorption (PSA) or temperature swing adsorption (TSA); since the purity of hydrogen produced by electrolysis is already relatively high after the initial separation system, basically higher than 99%, the traditional PSA purification capacity is limited if it is further improved. Therefore, in electrolytic hydrogen production, catalytic deoxygenation combined with TSA purification is often used to obtain higher purity hydrogen without losing hydrogen and hydrogen production capacity.

[0003] In the traditional three-tower equipment for electrolytic hydrogen production and purification, the prior art, with the authorization number CN216878638U, discloses a hydrogen purification system and a water electrolysis hydrogen production system, and provides a three-tower structure purification equipment. The hydrogen purification system includes three dryers, and the three dryers share a regeneration circulation module, which significantly reduces the number of heaters and coolers. Therefore, the manufacturing cost of the system is relatively low; at the same time, a first gas-to-gas heat exchanger is provided in the regeneration circulation system, so that the low-temperature regenerated hydrogen before regeneration and the high-temperature regenerated tail gas after regeneration can exchange heat, which can make full use of the waste heat of the high-temperature regeneration tail gas on the one hand, and can significantly reduce the power consumption of subsequent heaters and regeneration coolers on the other hand.

[0004] Therefore, it is necessary to creatively reduce the one-to-one layout of the heater and condenser of each drying tube on the traditional three-tower gas processing equipment, and form a unified, shared heating and desorption system and cooling system; however, it still uses a relatively complex pipeline valve system, regeneration auxiliary heat system and cooling system, and its desorption and regeneration temperature is as high as 220-280℃, and it still has a high energy consumption level and more equipment and instrument configurations. Utility Model Content

[0005] In order to solve the above problems, this paper proposes a three-connected circulating dehydration reactor group for electrolytic hydrogen production. The dehydration reactor group is vertically provided with three dehydration reactors of the same type. The upper and lower ends of the dehydration reactor are provided with valve groups. The valve group at the upper end is connected to the defogger inlet pipeline, the straight inlet pipeline and the reverse outlet pipeline, and the valve group at the lower end is connected to the reverse inlet pipeline, the defogger outlet pipeline and the straight outlet pipeline. The valve group includes two three-way valves vertically arranged in series, one port of the outer three-way valve is interconnected with one port of the inner three-way valve, and the other two ports of the outer three-way valve are respectively connected with the defogger pipeline and the straight pipeline, one port of the inner three-way valve is connected with the dehydration reactor, and the outer port of the inner three-way valve is connected with the reverse pipeline. A small number of valves and equipment can be combined to achieve the production of high-purity hydrogen. Compared with traditional hydrogen production and purification equipment, the number of equipment can be reduced by more than 25%, the number of valves can be reduced by more than 35%, and the weight can be reduced by more than 20%, which significantly reduces the production cost and floor space, and improves the stability of the equipment and the adaptability to the on-site installation environment.

[0006] The dehydration reactor comprises a straight-out reactor, a demisting circulation reactor and a reverse dehydration reactor. The dehydration reactors are all regulated and connected with the demisting pipeline, the straight-through pipeline and the reverse pipeline through a valve group adjustment method. The straight-out reactor is connected with the straight-through pipeline, the demisting circulation reactor is connected with the demisting pipeline, and the reverse dehydration reactor is connected with the reverse hanging pipeline. The dehydration reactor is a microwave dehydration reactor. The reactor adopts microwave dehydration technology instead of the traditional electric heating (heat conduction), which has higher efficiency and lower energy consumption. It is combined with the deoxygenation reactor to draw out hot air for coordinated dehydration, fully utilizes thermal energy, improves efficiency and saves energy consumption. Due to the strong penetrability of microwave heating, it directly acts on water molecules, and the non-traditional heat transfer heating dehydration, its dehydration is faster and the cooling is faster, so its cooling and heating time is short, and the produced hydrogen is purer.

[0007] The straight-through pipeline comprises a straight-through inlet pipeline and a straight-through outlet pipeline, wherein the straight-through inlet pipeline is connected to the valve group at the upper part of the dehydration reactor, and the straight-through outlet pipeline is connected to the valve group at the lower part of the dehydration reactor; the demister pipeline comprises a demister inlet pipeline and a demister outlet pipeline, wherein the demister inlet pipeline is connected to the valve group at the upper part of the dehydration reactor, and the demister outlet pipeline is connected to the valve group at the lower part of the dehydration reactor; a cooling reflux booster is arranged at the end of the demister outlet pipeline; the reverse pipeline comprises a reverse inlet pipeline and a reverse outlet pipeline, wherein the reverse inlet pipeline is connected to the valve group at the lower part of the dehydration reactor, a drying purge dehumidification booster is arranged at the end of the reverse inlet pipeline, and the reverse outlet pipeline is connected to the valve group at the upper part of the dehydration reactor. The reverse pipeline has the ability to significantly shorten the dehydration time, and the traditional dehydration cycle can be shortened from 8-12 hours to within 5 hours through the cooperation of the valve group and the reactor, thereby having significant effects of energy saving and reducing the equipment volume.

[0008] The three-way valve is a pneumatic three-way air-sealed valve, which can achieve better pipeline planning and improve the integration of the overall dehydration reactor group.

[0009] Beneficial effects:

[0010] The production of high-purity hydrogen can be achieved by combining a small number of valves and equipment. Compared with traditional hydrogen production and purification equipment, the number of equipment can be reduced by more than 25%, the number of valves can be reduced by more than 35%, and the weight can be reduced by more than 20%, which significantly reduces production costs and floor space, and improves equipment stability and adaptability to on-site installation environments.

[0011] It has the ability to significantly shorten the dehydration time. Through the coordination of the valve group and the reactor, the traditional dehydration cycle can be shortened from 8-12 hours to less than 5 hours, which has the effect of significant energy saving and equipment size reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The present invention is a schematic flow diagram of a three-connected circulating dehydration reactor group for producing hydrogen by electrolysis;

[0013] In the figure; 1. Drying and blowing dehumidifying booster, 2. Cooling reflux booster, 3. Straight-through dehydration reactor, 4. Demisting circulation reactor, 5. Reverse dehydration reactor, 6. Three-way valve, 7. Demisting inlet pipeline, 8. Straight-through inlet pipeline, 9. Reverse outlet pipeline, 10. Reverse inlet pipeline, 11. Demisting outlet pipeline, 12. Straight-through outlet pipeline. DETAILED DESCRIPTION

[0014] In order to deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with embodiments and drawings. The embodiments are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention.

[0015] Drying and purge dehumidifying booster 1, cooling reflux booster 2, straight-through dehydration reactor 3, demisting circulation reactor 4, reverse dehydration reactor 5, three-way valve 6, demisting inlet pipeline 7, straight-through inlet pipeline 8, reverse outlet pipeline 9, reverse inlet pipeline 10, demisting outlet pipeline 11, straight-through outlet pipeline 12.

[0016] like Figure 1 As shown;

[0017] A three-connected circulating dehydration reactor group for electrolytic hydrogen production, wherein the dehydration reactor group is vertically provided with three dehydration reactors of the same type, wherein valve groups are provided at both upper and lower ends of the dehydration reactor, wherein the valve group at the upper end is connected to a defogger inlet pipeline 7, a straight inlet pipeline 8 and a reverse outlet pipeline 9, and the valve group at the lower end is connected to a reverse inlet pipeline 10, a defogger outlet pipeline 11 and a straight outlet pipeline 12, wherein the valve group comprises two three-way valves 6 vertically arranged in series and connected to each other, wherein one port of the outer three-way valve 6 is connected to one port of the inner three-way valve 6, and the other two ports of the outer three-way valve 6 are connected to the defogger pipeline and the straight outlet pipeline respectively, wherein one port of the inner three-way valve 6 is connected to the dehydration reactor, and the outer port of the inner three-way valve 6 is connected to the reverse pipeline, wherein the dehydration reactor comprises a straight outlet reactor, a defogger circulating reactor 4 and a reverse dehydration reactor 5, wherein the dehydration reactors are all connected to the defogger pipeline, the straight outlet pipeline and the reverse outlet pipeline by regulating means of the valve group, and the straight outlet reactor is connected to the straight outlet pipeline. The demisting circulation reactor 4 is connected to the demisting pipeline, the reverse dehydration reactor 5 is connected to the reverse hanging pipeline, the dehydration reactor is a microwave dehydration reactor, the straight pipeline includes a straight inlet pipeline 8 and a straight outlet pipeline 12, the straight inlet pipeline 8 is connected to the valve group at the top of the dehydration reactor, the straight outlet pipeline 12 is connected to the valve group at the bottom of the dehydration reactor, the demisting pipeline includes a demisting inlet pipeline 7 and a demisting outlet pipeline 11, the demisting inlet pipeline 7 is connected to the dehydration reactor, and the reverse dehydration reactor 5 is connected to the reverse hanging pipeline. The dehumidification reactor is connected with the valve group at the top of the dehydration reactor, the demister outlet pipeline 11 is connected with the valve group at the bottom of the dehydration reactor, a cooling reflux booster 2 is arranged at the end of the demister outlet pipeline 11, the reverse pipeline comprises a reverse inlet pipeline 10 and a reverse outlet pipeline 9, the reverse inlet pipeline 10 is connected with the valve group at the bottom of the dehydration reactor, a drying purge dehumidification booster 1 is arranged at the end of the reverse inlet pipeline 10, the reverse outlet pipeline 9 is connected with the valve group at the top of the dehydration reactor, and the three-way valve 6 is a pneumatic three-way air-sealed valve.

[0018] Implementation examples;

[0019] The straight inlet pipeline 8 enters the straight dehydration reactor 3 through the valve group of the three-way valve 6. The hydrogen that passes through the straight-out reactor is adsorbed and dehydrated by the molecular sieve and then flows out from the straight outlet pipeline 12. After the straight-out reactor is saturated with adsorption, it can enter the next stage for microwave heating desorption;

[0020] The low-temperature hydrogen in the demisting inlet pipeline 7 enters the demisting circulation reactor 4 through the valve group of the three-way valve 6 for cooling. The temperature of the hydrogen in the molecular sieve filler and the reaction tower dried in the previous stage and at a higher temperature will be increased by 20-50°C at this time. The hydrogen passes through the three-way valve 6 and flows back to the front end of the hydrogen cooler through the cooling reflux booster 2. The demisting circulation reactor 4 after cooling enters the next stage of hydrogen dehydration adsorption through the dehydration reactor 3;

[0021] When the hydrogen reaches 100-120°C, 5-10% of the total flow of hydrogen after deoxygenation through the dry purge dehumidification booster 1 enters the reverse inlet pipeline, and then enters the reverse dehydration reactor 5 through the reverse inlet pipeline. At this time, the microwave heater of the reverse dehydration reactor 5 is turned on, and the hot air flow combined with microwave heating dehydration can make the adsorption saturated molecular sieve quickly remove moisture, and the hydrogen carrying moisture is returned to the waste heat recovery cooler, and the reverse dehydration reactor 5 after drying enters the next stage of cooling.

[0022] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A three-connected circulating dehydration reactor group for electrolytic hydrogen production, wherein the dehydration reactor group is vertically provided with three dehydration reactors of the same type, characterized in that: The dehydration reactor is provided with valve groups at both the upper and lower ends. The valve group at the upper end is connected to the defogger inlet pipeline, the straight inlet pipeline and the reverse outlet pipeline, and the valve group at the lower end is connected to the reverse inlet pipeline, the defogger outlet pipeline and the straight outlet pipeline. The valve group includes two three-way valves vertically arranged in series, one port of the outer three-way valve is connected to one port of the inner three-way valve, the other two ports of the outer three-way valve are connected to the defogger pipeline and the straight pipeline respectively, one port of the inner three-way valve is connected to the dehydration reactor, and the outer port of the inner three-way valve is connected to the reverse pipeline.

2. The three-connected circulating dehydration reactor group for hydrogen production by electrolysis according to claim 1, characterized in that: The dehydration reactor comprises a straight-out reactor, a demisting circulation reactor and a reverse dehydration reactor. The dehydration reactors are all regulated and connected with the demisting pipeline, the straight-through pipeline and the reverse pipeline through a valve group. The straight-out reactor is connected with the straight-through pipeline, the demisting circulation reactor is connected with the demisting pipeline, and the reverse dehydration reactor is connected with the reverse hanging pipeline.

3. The three-connected circulating dehydration reactor group for electrolytic hydrogen production according to claim 1, characterized in that: The dehydration reactor is a microwave dehydration reactor.

4. The three-connected circulating dehydration reactor group for hydrogen production by electrolysis according to claim 1, characterized in that: The straight pipeline includes a straight inlet pipeline and a straight outlet pipeline. The straight inlet pipeline is connected to the valve group at the upper part of the dehydration reactor, and the straight outlet pipeline is connected to the valve group at the lower part of the dehydration reactor.

5. The three-connected circulating dehydration reactor group for hydrogen production by electrolysis according to claim 1, characterized in that: The demisting pipeline includes a demisting inlet pipeline and a demisting outlet pipeline. The demisting inlet pipeline is connected to the valve group at the top of the dehydration reactor, and the demisting outlet pipeline is connected to the valve group at the bottom of the dehydration reactor. A cooling reflux booster is provided at the end of the demisting outlet pipeline.

6. The three-connected circulating dehydration reactor group for hydrogen production by electrolysis according to claim 1, characterized in that: The reverse pipeline includes a reverse inlet pipeline and a reverse outlet pipeline. The reverse inlet pipeline is connected to the valve group at the bottom of the dehydration reactor. A drying purge dehumidification booster is provided at the end of the reverse inlet pipeline. The reverse outlet pipeline is connected to the valve group at the top of the dehydration reactor.

7. The three-connected circulating dehydration reactor group for hydrogen production by electrolysis according to claim 1, characterized in that: The three-way valve is a pneumatic three-way air-sealed valve.

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