PEM electrolyzed water purification system

Abstract

The utility model belongs to the technical field of PEM electrolyzed water hydrogen production, and particularly relates to a PEM electrolyzed water purification system which comprises a hydrogen heating cylinder body and a tubular heat exchanger with a collector, a drainage end of the tubular heat exchanger with the collector is provided with a tubular heat exchanger drainage valve, and the hydrogen heating cylinder body is communicated with a purification cylinder A and a purification cylinder B in parallel. And the A-cylinder purification cylinder and the B-cylinder purification cylinder are respectively communicated with the tubular heat exchanger with the collector through an A-cylinder one-way valve assembly and a B-cylinder one-way valve assembly. According to the utility model, two tubular heat exchangers, one hydrogen purification cylinder and two manual needle valves are reduced, so that the on-off trend of a three-tower control pipeline is reduced from the original fifteen valve bodies to only five valve bodies after optimization, and zero loss of temperature swing adsorption hydrogen can be completely realized; due to the fact that the three-tower valve bodies and the cylinder bodies are large in number, the trend of hydrogen needs to be controlled, hydrogen pipelines are relatively dense, the number of the hydrogen pipelines is large, and the number of the pipelines is greatly reduced after optimization.

Description

Technical Field

[0001] The utility model belongs to the technical field of PEM water electrolysis hydrogen production, and specifically relates to a PEM water electrolysis purification system. Background Art

[0002] In the field of PEM water electrolysis hydrogen production, a three-tower temperature swing adsorption water electrolysis purification system is generally used, such as Figure 3 As shown, the three-tower temperature-swing adsorption electrolysis water purification system requires multiple purification cylinders, each of which needs to be equipped with a heating rod for heating and a tubular heat exchanger for cooling. The heating and cooling process is switched and controlled in turn according to the regeneration and purification status of the three towers.

[0003] The composition of so many cylinders requires multiple control valve groups and needle valves, and multiple hydrogen pipeline connections to achieve the control of hydrogen switching. This has high costs, complex circuits, low production efficiency, and relatively complex control logic. Utility Model Content

[0004] The utility model aims to provide a PEM water electrolysis purification system, aiming to solve the problems of production efficiency, production cost and control logic of the three-tower temperature swing adsorption PEM water electrolysis hydrogen purification system in the prior art.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a PEM electrolytic water purification system, comprising a hydrogen heating cylinder and a tubular heat exchanger with a collector, the drainage end of the tubular heat exchanger with a collector is provided with a tubular heat exchanger drainage valve, the hydrogen heating cylinder is connected in parallel with a cylinder A purification cylinder and a cylinder B purification cylinder, the cylinder A purification cylinder and the cylinder B purification cylinder are connected to the tubular heat exchanger with a collector through a cylinder A check valve assembly and a cylinder B check valve assembly respectively, and a hydrogen inspection and qualified hydrogen output pipeline is connected between the outlets of the cylinder A purification cylinder and the cylinder B purification cylinder.

[0006] As a preferred embodiment of the PEM electrolytic water purification system of the utility model, an A-cylinder air intake valve is installed between the air outlet end of the hydrogen heating cylinder body and the air inlet end of the A-cylinder purification cylinder.

[0007] As a preferred embodiment of the PEM electrolytic water purification system of the utility model, a B cylinder air intake valve is installed between the air outlet end of the hydrogen heating cylinder and the air inlet end of the B cylinder purification cylinder.

[0008] As a preferred PEM electrolytic water purification system of the utility model, the A cylinder one-way valve assembly includes: an A cylinder air inlet one-way valve and an A cylinder air outlet one-way valve, the air outlet end of the A cylinder purification cylinder is connected to the air inlet end of the tubular heat exchanger with a collector through the A cylinder air outlet one-way valve, and the air inlet end of the A cylinder purification cylinder is connected to the air outlet end of the tubular heat exchanger with a collector through the A cylinder air inlet one-way valve.

[0009] As a preferred PEM electrolytic water purification system of the utility model, the B cylinder one-way valve assembly includes: a B cylinder air inlet one-way valve and a B cylinder air outlet one-way valve, the air outlet end of the B cylinder purification cylinder is connected to the air inlet end of the tubular heat exchanger with a collector through the B cylinder air outlet one-way valve, and the air inlet end of the B cylinder purification cylinder is connected to the air outlet end of the tubular heat exchanger with a collector through the B cylinder air inlet one-way valve.

[0010] As a preferred embodiment of the PEM electrolytic water purification system of the utility model, cylinder A outlet valve and cylinder B outlet valve are respectively provided between the cylinder A purification cylinder and cylinder B purification cylinder and the hydrogen inspection and qualified hydrogen output pipeline.

[0011] As a preferred PEM electrolytic water purification system of the utility model, the A cylinder purification cylinder and the B cylinder purification cylinder both include: a hydrogen outlet and a molecular sieve filling port, a hydrogen inlet, a molecular sieve discharge port, a temperature sensor installation port under the cylinder body, and a temperature sensor installation port on the cylinder body.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] 1. Reduce costs: reduce two tubular heat exchangers and one hydrogen purification cylinder, reduce two manual needle valves, and the on-off direction of the three-tower control pipeline has been reduced from the original fifteen valve bodies to only five valve bodies after optimization to fully realize temperature-swing adsorption of hydrogen without loss. In addition, due to the large number of valve bodies and cylinders in the three towers, the direction of hydrogen needs to be controlled, and the hydrogen pipelines are relatively dense and large in number. After optimization, the number of pipelines has been greatly reduced;

[0014] 2. Efficiency improvement: From the reduction of various valve bodies, pipelines and cylinders, the production efficiency is obviously faster and simpler than the existing production efficiency. There are two ways to connect the pipes, one is the ferrule fastening and the other is the pipe welding. Every time a pipe is reduced, the time for tightening two ferrule joints, or the welding and cleaning and grinding process of the two pipes is reduced;

[0015] 3. Reduce the risk of hydrogen leakage: Since the tightening and welding of each joint of the pipeline may cause leakage, the possibility of hydrogen leakage is effectively reduced by reducing the number of pipelines;

[0016] 4. Control logic: Due to the reduction of accessories and equipment, the control logic of the whole system is relatively simple. Previously, manual experiments were required to adjust the opening of the needle valve to control the hydrogen flow in the hydrogen regeneration gas path and the purification gas path, but now no adjustment is required;

[0017] 5. Equipment space: Due to the reduction of cylinder and valve body pipelines, the volume of the entire equipment is also reduced accordingly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0019] Figure 1 It is a schematic diagram of the principle flow of the utility model;

[0020] Figure 2 This is a schematic diagram of the purification cylinder structure of the utility model;

[0021] Figure 3 It is a schematic diagram of the principle flow of the existing three-tower temperature swing adsorption water electrolysis hydrogen production system;

[0022] Figure 4 This is a schematic diagram of the purification cylinder structure in the existing three-tower temperature-swing adsorption electrolysis water hydrogen production system.

[0023] In the figure: 1. Hydrogen heating cylinder; 2. Air intake valve of cylinder A; 3. Air intake valve of cylinder B; 4. Drain valve of tubular heat exchanger; 5. Purification cylinder of cylinder A; 6. Tubular heat exchanger with collector; 7. Purification cylinder of cylinder B; 8. Air intake check valve of cylinder A; 9. Air intake check valve of cylinder B; 10. Air outlet check valve of cylinder A; 11. Air outlet check valve of cylinder B; 12. Air outlet valve of cylinder A; 13. Air outlet valve of cylinder B; a. Hydrogen outlet and molecular sieve packing port; b. Hydrogen inlet; c. Molecular sieve discharge port; d. Temperature sensor installation port under cylinder; e. Temperature sensor installation port on cylinder. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] See also Figure 1-Figure 2The utility model provides the following technical solutions: a PEM electrolytic water purification system, comprising a hydrogen heating cylinder 1 and a tubular heat exchanger 6 with a collector, a tubular heat exchanger drain valve 4 is provided at the drain end of the tubular heat exchanger 6 with a collector, the hydrogen heating cylinder 1 is connected in parallel with an A cylinder purification cylinder 5 and a B cylinder purification cylinder 7, the A cylinder purification cylinder 5 and the B cylinder purification cylinder 7 are connected to the tubular heat exchanger 6 with a collector through an A cylinder check valve assembly and a B cylinder check valve assembly, the A cylinder purification cylinder 5 and the B cylinder purification cylinder 7 are connected in parallel with the tubular heat exchanger 6 with a collector, A hydrogen inspection and qualified hydrogen output pipeline is connected between the outlets of cylinder 7, and cylinder A outlet valve 12 and cylinder B outlet valve 13 are respectively arranged between cylinder A purification cylinder 5 and cylinder B purification cylinder 7 and the hydrogen inspection and qualified hydrogen output pipeline. Cylinder A purification cylinder 5 and cylinder B purification cylinder 7 both include: a hydrogen outlet and molecular sieve filling port a, a hydrogen inlet b, a molecular sieve discharge port c, a temperature sensor installation port d under the cylinder body and a temperature sensor installation port e on the cylinder body. The purification cylinder has a simple structure and can effectively shorten production time and cost.

[0026] When the above technical solution is used: hydrogen first flows to the hydrogen heating cylinder 1, the hydrogen will gradually heat up and flow to the A cylinder intake valve 2 and the B cylinder intake valve 3. Now open the A cylinder intake valve 2, and the hydrogen flows into the A cylinder purification cylinder 5 from the hydrogen inlet b of the A cylinder purification cylinder 5. The A cylinder intake check valve 8 is a check valve and hydrogen does not pass through. Since the front is the heating cylinder and directly flows to the A cylinder purification cylinder 5, the temperature of the A cylinder purification cylinder 5 is relatively high at this time, and the water molecules adsorbed by the molecular sieve will begin to slowly form water vapor. As the front hydrogen is continuously transported, the water vapor is slowly blown out of the A cylinder purification cylinder 5 over time. In this process, the A cylinder purification cylinder 5 is in a regeneration state. After coming out from the hydrogen outlet of the A cylinder purification cylinder 5 and the molecular sieve filler port a outlet, it will pass through the A cylinder outlet valve 12 and the A cylinder outlet check valve 10. At this time, the A cylinder outlet valve 12 is closed, so the hydrogen will flow from the A cylinder outlet check valve 10 to the tubular heat exchanger with a collector 6. The hydrogen to the tubular heat exchanger with a collector 6, this water-cooled tubular heat exchanger, after hydrogen is input, cooling water continuously takes away heat, the hydrogen temperature decreases, the water vapor in the middle also condenses into water droplets, which drip into the collector below, and the hydrogen comes out of the tubular heat exchanger 6 with collector to the A cylinder intake check valve 8 and the B cylinder intake check valve 9. Since there is pressure on the left side of the A cylinder intake check valve 8, the hydrogen will pass through the B cylinder intake check valve 9 to the hydrogen inlet b of the B cylinder purification cylinder 7 to the B cylinder purification cylinder 7. At this time, the hydrogen is cooled to 80°C or above. The molecular sieve is now absorbing moisture. At this time, the B cylinder purification cylinder 7 is in the process of purification. After the purification is completed, hydrogen flows out from the hydrogen outlet of the B cylinder purification cylinder 7 and the molecular sieve filler port a. At this time, there are two branches, the B cylinder gas outlet check valve 11 and the B cylinder gas outlet valve 13. At this time, there is pressure on the left side of the B cylinder gas outlet check valve 11. When the B cylinder gas outlet valve 13 is opened, hydrogen will flow out from the B cylinder gas outlet valve 13 to the hydrogen transported to the rear end detection path (i.e.: hydrogen inspection and qualified hydrogen output pipeline);

[0027] The second working state is the purification and regeneration switching working state after running to the set time. The principle is the same as above, except that the direction of hydrogen is different, namely: hydrogen heats cylinder body 1 → B cylinder intake valve 3 → B cylinder purification cylinder 7 regenerates → B cylinder outlet valve 13 closes through B cylinder outlet check valve 11 → tubular heat exchanger 6 with collector → A cylinder intake check valve 8 → A cylinder purification cylinder 5 purifies → A cylinder outlet valve 12 discharges → to the detection route (ie: hydrogen inspection and qualified hydrogen output pipeline).

[0028] Control logic: A cylinder purification cylinder 5 works: open B cylinder air inlet valve 3, A cylinder air outlet valve 12, the temperature of the two cylinders is not enough at this time, both cylinders are in purified hydrogen, as the hydrogen heating cylinder 1 continues to heat, the hydrogen slowly rises to above 200℃, the hot gas flows to B cylinder purification cylinder 7 for regeneration, B cylinder purification cylinder 7 continuously inputs high temperature hydrogen to discharge internal water molecules, B cylinder purification cylinder 7 regeneration is completed, hydrogen heating cylinder 1 is disconnected from heating, the temperature of hydrogen heating cylinder 1 slowly decreases, B cylinder purification cylinder 7 also slowly cools down with the temperature, B cylinder purification cylinder 7 changes from regeneration state to purification state with the temperature drop, at this time the temperature of the two cylinders is lower than 80℃, the two cylinders are in the purification process at the same time, at this time if the time is reached, the working cylinder can be switched;

[0029] The operation of purification cylinder 5 of cylinder A is switched to that of purification cylinder 7 of cylinder B: open the air inlet valve 2 of cylinder A and the air outlet valve 13 of cylinder B. The temperatures of the two cylinders are not high at this time and both cylinders are in purified hydrogen. As the hydrogen heating cylinder 1 continues to heat, the hydrogen slowly rises to above 200°C and the hot gas flows to the purification cylinder 5 of cylinder A for regeneration. The purification cylinder 5 of cylinder A continuously inputs high-temperature hydrogen to discharge the internal water molecules. After the regeneration of purification cylinder 5 of cylinder A is completed, the heating of the hydrogen heating cylinder 1 is disconnected. The temperature of the hydrogen heating cylinder 1 slowly decreases and the purification cylinder 5 of cylinder A also slowly cools down as the temperature decreases. As the temperature drops, the purification cylinder 5 of cylinder A changes from the regeneration state to the purification state. At this time, the temperatures of the two cylinders are both below 80°C and the two cylinders are in the purification process at the same time. If the time is reached at this time, the working cylinder can be switched.

[0030] Preferably: an A-cylinder air intake valve 2 is installed between the air outlet end of the hydrogen heating cylinder body 1 and the air inlet end of the A-cylinder purification cylinder 5, and the A-cylinder air intake valve 2 is used to control the passage between the hydrogen heating cylinder body 1 and the air inlet end of the A-cylinder purification cylinder 5; a B-cylinder air intake valve 3 is installed between the air outlet end of the hydrogen heating cylinder body 1 and the air inlet end of the B-cylinder purification cylinder 7, and the B-cylinder air intake valve 3 is used to control the passage between the hydrogen heating cylinder body 1 and the air inlet end of the B-cylinder purification cylinder 7.

[0031] Preferably: the A cylinder one-way valve assembly includes: an A cylinder air inlet one-way valve 8 and an A cylinder air outlet one-way valve 10, the air outlet end of the A cylinder purification cylinder 5 is connected to the air inlet end of the tubular heat exchanger 6 with a collector through the A cylinder air outlet one-way valve 10, and the air inlet end of the A cylinder purification cylinder 5 is connected to the air outlet end of the tubular heat exchanger 6 with a collector through the A cylinder air inlet one-way valve 8.

[0032] During specific use, the A cylinder air intake check valve 8 can only pass the hydrogen discharged from the tubular heat exchanger 6 with a collector and enter the A cylinder purification cylinder 5 in one direction, while the A cylinder air outlet check valve 10 can only pass the hydrogen discharged from the A cylinder purification cylinder 5 and enter the tubular heat exchanger 6 with a collector in one direction.

[0033] Preferably: the B cylinder one-way valve assembly includes: a B cylinder air inlet one-way valve 9 and a B cylinder air outlet one-way valve 11, the air outlet end of the B cylinder purification cylinder 7 is connected to the air inlet end of the tubular heat exchanger with a collector 6 through the B cylinder air outlet one-way valve 11, and the air inlet end of the B cylinder purification cylinder 7 is connected to the air outlet end of the tubular heat exchanger with a collector 6 through the B cylinder air inlet one-way valve 9.

[0034] During specific use, the B cylinder air inlet check valve 9 can only pass the hydrogen discharged from the tubular heat exchanger 6 with a collector and enter the B cylinder purification cylinder 7 in one direction, while the B cylinder air outlet check valve 11 can only pass the hydrogen discharged from the B cylinder purification cylinder 7 and enter the tubular heat exchanger 6 with a collector in one direction.

[0035] In summary: the utility model reduces two tubular heat exchangers, one hydrogen purification cylinder, and two manual needle valves. The on-off direction of the three-tower control pipeline is also reduced from the original fifteen valve bodies to only five valve bodies after optimization to fully realize temperature-variable adsorption of hydrogen without loss. In addition, since there are many valve bodies and cylinder bodies in the three towers to control the direction of hydrogen, the hydrogen pipelines are relatively dense and large in number. After optimization, the number of pipelines is greatly reduced, thereby achieving cost reduction, efficiency improvement, and optimization of control logic in the process of PEM water electrolysis for hydrogen production.

[0036] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A PEM electrolytic water purification system, comprising a hydrogen heating cylinder (1) and a tubular heat exchanger (6) with a collector, wherein a tubular heat exchanger drain valve (4) is provided at a drain end of the tubular heat exchanger (6) with a collector, and characterized in that: The hydrogen heating cylinder (1) is connected in parallel with an A-cylinder purification cylinder (5) and a B-cylinder purification cylinder (7); the A-cylinder purification cylinder (5) and the B-cylinder purification cylinder (7) are connected to a tubular heat exchanger (6) with a collector via an A-cylinder check valve assembly and a B-cylinder check valve assembly, respectively; and a hydrogen inspection and qualified hydrogen output pipeline is connected between the outlets of the A-cylinder purification cylinder (5) and the B-cylinder purification cylinder (7).

2. A PEM electrolysis water purification system according to claim 1, characterized in that: An A-cylinder air intake valve (2) is installed between the air outlet end of the hydrogen heating cylinder (1) and the air intake end of the A-cylinder purification cylinder (5).

3. A PEM electrolysis water purification system according to claim 1, characterized in that: A cylinder B air intake valve (3) is installed between the air outlet end of the hydrogen heating cylinder (1) and the air intake end of the cylinder B purification cylinder (7).

4. A PEM electrolysis water purification system according to claim 1, characterized in that: The A cylinder non-return valve assembly comprises: an A cylinder air inlet non-return valve (8) and an A cylinder air outlet non-return valve (10); the air outlet end of the A cylinder purification cylinder (5) is connected to the air inlet end of the tubular heat exchanger (6) with a collector via the A cylinder air outlet non-return valve (10); and the air inlet end of the A cylinder purification cylinder (5) is connected to the air outlet end of the tubular heat exchanger (6) with a collector via the A cylinder air inlet non-return valve (8).

5. A PEM electrolysis water purification system according to claim 1, characterized in that: The B cylinder non-return valve assembly comprises: a B cylinder air inlet non-return valve (9) and a B cylinder air outlet non-return valve (11); the air outlet end of the B cylinder purification cylinder (7) is connected to the air inlet end of the tubular heat exchanger (6) with a collector via the B cylinder air outlet non-return valve (11); the air inlet end of the B cylinder purification cylinder (7) is connected to the air outlet end of the tubular heat exchanger (6) with a collector via the B cylinder air inlet non-return valve (9).

6. A PEM electrolysis water purification system according to claim 1, characterized in that: An A cylinder gas outlet valve (12) and a B cylinder gas outlet valve (13) are respectively provided between the A cylinder purification cylinder (5) and the B cylinder purification cylinder (7) and the hydrogen inspection and qualified hydrogen output pipeline.

7. A PEM electrolysis water purification system according to claim 1, characterized in that: The A cylinder purification cylinder (5) and the B cylinder purification cylinder (7) are It includes: hydrogen outlet and molecular sieve filling port (a), hydrogen inlet (b), molecular sieve discharge port (c), cylinder body lower temperature sensor installation port (d) and cylinder body upper temperature sensor installation port (e).

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