High-purity PEM water electrolysis hydrogen production system

Abstract

The utility model belongs to the field of PEM water electrolysis hydrogen production, and particularly relates to a high-purity PEM water electrolysis hydrogen production system which comprises a primary purification system used for purifying hydrogen and a secondary high purification system connected to the tail end of the primary purification system and used for highly purifying hydrogen. The initial end of the primary purification system is connected with a water circulation system for producing hydrogen, and the hydrogen is produced by the water circulation system, is purified by the primary purification system and the secondary purification system in sequence, and is discharged in a high-purity manner. Compared with traditional high-purity hydrogen production equipment, the high-purity hydrogen production system is simple in technological process, high in equipment integration degree and low in cost, high-purity hydrogen can be produced only through pure water and electricity, so that a hydrogen storage bottle is replaced, and compared with a hydrogen steel bottle, the system does not store hydrogen, can be used while being produced, and is high in safety and reliability.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the PEM electrolytic water hydrogen production field, specifically relates to a kind of high-purity PEM electrolytic water hydrogen production system. BACKGROUND

[0002] Ultra-high purity hydrogen (99.99999%) is used for diamond production, and semiconductor field, and currently the generation of ultra-high purity hydrogen is mainly through finished hydrogen gas secondary purification, hydrogen gas with the purity of 99.99% is purified to 99.99999% by high-purity hydrogen gas purifier, and then the purified hydrogen gas is packaged and stored in hydrogen cylinder.

[0003] The existing high-purity hydrogen production and storage scheme has the problems of complicated process, long production cycle and low efficiency, high risk of gas cylinder storage, the need for cylinder replacement in high-purity hydrogen use places, poor stability and continuity, and inability to provide high-purity hydrogen for a long time.

[0004] Therefore, the utility model provides a kind of high-purity PEM electrolytic water hydrogen production system to meet the above needs. UTILITY MODEL CONTENTS

[0005] To achieve the above object, the utility model provides the following technical scheme: a kind of high-purity PEM electrolytic water hydrogen production system, including the first purification system for purifying hydrogen, and the second high purification system for highly purifying hydrogen connected at the end of the first purification system, a water circulation system for producing hydrogen is connected at the beginning of the first purification system, hydrogen is produced by the water circulation system, and is sequentially purified by the first purification system and the second high purification system, and is discharged with high purity.

[0006] The water circulation system includes a pure water tank and a PEM electrolytic cell connected to the pure water tank, and a water pump for pumping pure water from the pure water tank into the PEM electrolytic cell and a finned condenser for changing water temperature are sequentially connected between the pure water tank and the PEM electrolytic cell, and the outlet of the water pump is connected to the pure water tank through a pure water column.

[0007] As a preferred high-purity PEM electrolytic water hydrogen production system of the utility model, the first purification system includes a gas-liquid separator at the beginning, and a drying tower A and a drying tower B connected in parallel to the gas outlet end of the gas-liquid separator.

[0008] As a preferred high-purity PEM electrolytic water hydrogen production system of the utility model, the gas outlet end of the gas-liquid separator is connected to the gas inlet end of the drying tower A and the drying tower B through A tower gas inlet valve and B tower gas inlet valve, respectively.

[0009] As a kind of high-purity PEM electrolytic water hydrogen production system of the utility model, the outlet of drying tower A and drying tower B is connected with the beginning of two-stage high-purity system through A tower outlet one-way valve and B tower outlet one-way valve.

[0010] As a kind of high-purity PEM electrolytic water hydrogen production system of the utility model, purge metering valve is further connected on the parallel pipeline between drying tower A and drying tower B and the beginning of two-stage high-purity system, and the purge end of purge metering valve is further connected with the outlet of drying tower A and drying tower B through A tower purge one-way valve and B tower purge one-way valve respectively.

[0011] As a kind of high-purity PEM electrolytic water hydrogen production system of the utility model, the first-stage purification system further comprises water seal and water seal drainage valve connected with the drainage end of water seal, the drainage end of gas-liquid separator is communicated with the water inlet end of water seal through gas separation drainage valve, and the water inlet end of water seal is further communicated with the gas inlet end of drying tower A and drying tower B through A tower outlet valve and B tower outlet valve respectively.

[0012] As a kind of high-purity PEM electrolytic water hydrogen production system of the utility model, the two-stage high-purity system comprises first-stage back pressure valve at the beginning and high-purity hydrogen purifier at the end, and first-stage pressure reducing valve and high-purifier inlet one-way valve are further connected in sequence between the first-stage back pressure valve and high-purity hydrogen purifier.

[0013] As a kind of high-purity PEM electrolytic water hydrogen production system of the utility model, the two-stage high-purity system further comprises second-stage back pressure valve connected with the outlet of high-purity hydrogen purifier, and second-stage pressure reducing valve and dew point instrument connected with the second-stage back pressure valve in turn.

[0014] Compared with the prior art, the utility model has the advantages that:

[0015] Compared with traditional high-purity hydrogen production equipment, the system has simple process flow, high degree of equipment integration and low cost, and only needs pure water and electricity to produce high-purity hydrogen, so as to replace hydrogen storage cylinder, compared with hydrogen cylinder, the system does not store hydrogen, and is safe and reliable. BRIEF DESCRIPTION OF DRAWINGS

[0016] The accompanying drawings are included to provide a further understanding of the utility model, and constitute a part of the specification, and are used to explain the utility model together with embodiments of the utility model, and do not constitute a limitation on the utility model. In the drawings:

[0017] Figure 1 It is the system flow schematic diagram of the utility model.

[0018] In the figure: 101, pure water tank; 102, water pump; 103, finned condenser; 104, pure water column; 105, PEM electrolytic cell; 201, gas-liquid separator; 202, gas separation drain valve; 203, water seal device; 204, water seal drain valve; 205, A tower air inlet valve; 206, B tower air inlet valve; 207, drying tower A; 208, drying tower B; 209, A tower air outlet valve; 210, B tower air outlet valve; 211, A tower air outlet check valve; 212, B tower air outlet check valve; 213, purge metering valve; 214, A tower purge check valve; 215, B tower purge check valve; 301, primary back pressure valve; 302, primary pressure reducing valve; 303, high purity device air inlet check valve; 304, high purity hydrogen purifier; 305, secondary back pressure valve; 306, secondary pressure reducing valve; 307, dew point instrument. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0020] The utility model relates to a kind of high-purity PEM electrolytic water hydrogen production systems, as shown in Figure 1 It includes: the first purification system for purifying hydrogen, and the second high purification system for highly purifying hydrogen connected at the end of the first purification system, water circulation system for producing hydrogen is connected at the beginning of the first purification system, hydrogen is produced by the water circulation system, and is purified in turn after the first purification system, the second high purification system, and is discharged with high purity.

[0021] Please refer to Figure 1The primary purification system comprises a gas-liquid separator 201 at the beginning end, a drying tower A 207 and a drying tower B 208 connected in parallel with the gas outlet end of the gas-liquid separator 201, a water seal device 203 and a water seal drainage valve 204 connected at the water outlet end of the water seal device 203, the gas outlet end of the gas-liquid separator 201 is connected with the gas inlet end of the drying tower A 207 and the drying tower B 208 through A tower gas inlet valve 205 and B tower gas inlet valve 206 respectively, the gas outlet end of the drying tower A 207 and the drying tower B 208 is connected with the beginning end of the secondary high-purity purification system through A tower gas outlet check valve 211 and B tower gas outlet check valve 212 respectively, a purge metering valve 213 is further connected on the parallel pipeline between the drying tower A 207 and the drying tower B 208 and the beginning end of the secondary high-purity purification system, the purge end of the purge metering valve 213 is further connected with the gas outlet end of the drying tower A 207 and the drying tower B 208 through A tower purge check valve 214 and B tower purge check valve 215 respectively, the water outlet end of the gas-liquid separator 201 is connected with the water inlet end of the water seal device 203 through a gas separation drainage valve 202, and the water inlet end of the water seal device 203 is further connected with the gas inlet end of the drying tower A 207 and the drying tower B 208 through A tower gas outlet valve 209 and B tower gas outlet valve 210 respectively.

[0022] As shown in Figure 1 The secondary high-purity purification system comprises a primary back pressure valve 301 at the beginning end and a high-purity hydrogen purifier 304 at the end, further comprising a secondary back pressure valve 305 connected at the gas outlet end of the high-purity hydrogen purifier 304, a primary pressure reducing valve 302 and a high-purity purifier gas inlet check valve 303 are further connected in sequence between the primary back pressure valve 301 and the high-purity hydrogen purifier 304, a branch is further connected at the circumferential side of the gas outlet end of the secondary back pressure valve 305, and a secondary pressure reducing valve 306 and a dew point instrument 307 are further connected in sequence on the branch.

[0023] Specific use: as Figure 1As shown, deionized pure water is added into the pure water tank 101, and the pure water enters the PEM electrolytic cell 105 for electrolysis under the action of the circulating water pump 102. Since electrolysis of the electrolytic cell generates heat, the finned condenser 103 functions to reduce the water temperature to the optimal working temperature. Part of the pure water is branched into the pure water column 104, which functions to remove ions and other impurities in the water. The electrolyzed and purified water is finally returned to the pure water tank 101. The hydrogen gas generated by electrolysis of the PEM electrolytic cell 105 removes most of the water after passing through the gas-liquid separator 201, and the deposited water is discharged into the water seal 203 through the gas-water drainage valve 202. The hydrogen gas after gas-liquid separation enters the drying tower A 207 and the drying tower B 208, which work alternately, and PSA is regenerated. The working principle is that when the drying tower A 207 works, the drying tower B 208 is regenerated, the A-tower gas inlet valve 205 is opened, the A-tower gas outlet valve 209 is closed, hydrogen gas enters the drying tower A 207 for adsorption, the first-purified hydrogen gas enters the first back pressure valve 301 through the A-tower gas outlet one-way valve 211, a small amount of hydrogen gas enters the drying tower B 208 for sweeping and regeneration through the sweeping metering valve 213 and the B-tower sweeping one-way valve 215, the B-tower gas inlet valve 206 is closed, and the B-tower gas outlet valve 210 is opened. The regenerated hydrogen gas is discharged to the water seal 203 through the B-tower gas outlet valve 210. Similarly, when the drying tower B 208 works, the drying tower A 207 is regenerated, and the principle is the same, that is, when the drying tower B 208 works, the drying tower A 207 is regenerated, the B-tower gas inlet valve 206 is opened, the B-tower gas outlet valve 210 is closed, hydrogen gas enters the drying tower B 208 for adsorption, the first-purified hydrogen gas enters the first back pressure valve 301 through the B-tower gas outlet one-way valve 212, a small amount of hydrogen gas enters the drying tower A 207 for sweeping and regeneration through the sweeping metering valve 213 and the A-tower sweeping one-way valve 214, the A-tower gas inlet valve 205 is closed, and the A-tower gas outlet valve 209 is opened. The regenerated hydrogen gas is discharged to the water seal 203 through the A-tower gas outlet valve 209. The working pressure is 3 MPa. The first-purified hydrogen gas is adjusted to the working pressure of the high-purity hydrogen gas purifier 304 after passing through the first back pressure valve 301 and the first pressure reducing valve 302. The hydrogen gas enters the high-purity hydrogen gas purifier 304 through the high-purity purifier gas inlet one-way valve 303, and the first-purified hydrogen gas with a concentration of 99.99% is purified to 99.99999%. The second pressure reducing valve 306 and the dew point instrument 307 are used to detect the water content in the hydrogen gas. The high-purity purifier gas inlet one-way valve 303 and the second back pressure valve 305 function to maintain a certain working pressure in the high-purity hydrogen gas purifier 304, and the purifier still maintains positive pressure after the equipment is shut down, which is convenient for storage.

[0024] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and is not intended to limit the present application, although the foregoing embodiments of the present application have been described in detail, for the skilled in the art, it still can be modified, or for the equivalent replacement of part of the technical features of the technical solutions recorded in the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application, shall be included within the scope of the present application.

Claims

1. A high-purity PEM electrolysis water production system, comprising a primary purification system for purifying hydrogen, and a secondary high-purification system connected to the end of the primary purification system for further high-purification of hydrogen, characterized in that: A water circulation system for producing hydrogen is connected to the beginning of the primary purification system. The hydrogen is produced by the water circulation system and is discharged in high purity after being purified by the primary purification system and the secondary high purification system in sequence. The water circulation system includes a pure water tank (101) and a PEM electrolysis cell (105) connected to the pure water tank (101). A water pump (102) for pumping pure water from the pure water tank (101) into the PEM electrolysis cell (105) and a finned condenser (103) for changing the water temperature are also connected in sequence between the pure water tank (101) and the PEM electrolysis cell (105). The outlet of the water pump (102) is also connected to the pure water tank (101) through a pure water column (104).

2. The high-purity PEM electrolysis water production system according to claim 1, characterized in that: The primary purification system includes a gas-liquid separator (201) located at the beginning, and drying towers A (207) and B (208) connected in parallel with the gas outlet of the gas-liquid separator (201).

3. The high-purity PEM electrolysis water production system according to claim 2, characterized in that: The outlet of the gas-liquid separator (201) is connected to the inlet of the drying tower A (207) and the drying tower B (208) through the inlet valve of tower A (205) and the inlet valve of tower B (206), respectively.

4. The high-purity PEM electrolysis water production system according to claim 2, characterized in that: The outlets of drying tower A (207) and drying tower B (208) are connected in parallel to the starting point of the secondary high purification system through one-way valves (211) for tower A and (212) for tower B, respectively.

5. The high-purity PEM electrolysis water production system according to claim 4, characterized in that: A purge metering valve (213) is also connected to the parallel pipeline between the drying tower A (207) and the drying tower B (208) and the beginning of the secondary high purification system. The purge end of the purge metering valve (213) is also connected to the gas outlet of the drying tower A (207) and the drying tower B (208) through the A tower purge check valve (214) and the B tower purge check valve (215), respectively.

6. The high-purity PEM electrolysis water production system according to claim 2, characterized in that: The primary purification system further includes a water seal (203) and a water seal drain valve (204) connected to the drain end of the water seal (203). The drain end of the gas-liquid separator (201) is connected to the water inlet end of the water seal (203) through the gas separation drain valve (202). The water inlet end of the water seal (203) is also connected to the gas inlet ends of the drying tower A (207) and the drying tower B (208) through the gas outlet valve (209) of tower A and the gas outlet valve (210) of tower B, respectively.

7. A high-purity PEM electrolysis water production system according to any one of claims 1-6, characterized in that: The secondary high-purification system includes a primary back pressure valve (301) at the beginning and a high-purity hydrogen purifier (304) at the end. A primary pressure reducing valve (302) and a high-purity hydrogen purifier inlet check valve (303) are also connected in sequence between the primary back pressure valve (301) and the high-purity hydrogen purifier (304).

8. A high-purity PEM electrolysis water production system according to claim 7, characterized in that: The secondary high-purity system further includes: a secondary back pressure valve (305) connected to the outlet of the high-purity hydrogen purifier (304), and a secondary pressure reducing valve (306) and a dew point meter (307) connected in sequence to the secondary back pressure valve (305).

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