PEM water electrolysis hydrogen production water circulation system

Abstract

The utility model belongs to the technical field of PEM water electrolysis hydrogen production, and particularly relates to a water circulation system for PEM water electrolysis hydrogen production. The water inlet end of the pretreatment system is connected with the water outlet end of the raw water tank through a direct-current pump; the water inlet end of the secondary treatment equipment is connected with the water outlet end of the pretreatment system through an electromagnetic valve; the water inlet end of the pressure barrel is connected with the water outlet end of the secondary treatment equipment through a booster pump; the water inlet end of the purification column is connected with the water outlet end of the pressure barrel through an electromagnetic valve; the water inlet end of the pure water tank is connected with the water outlet end of the purification column through an electromagnetic valve; the water inlet end of the heat exchanger is connected with the water outlet end of the pure water tank through a centrifugal pump. According to the PEM water electrolysis hydrogen production system, the circulating water paths of the water purification machine and the hydrogen production equipment are integrated and mixed, so that the PEM water electrolysis hydrogen production system can directly use municipal water as a raw material, the pipeline between the PEM water electrolysis hydrogen production system and the water purification machine is optimized and integrated, and waste water can also be discharged into the pure water tank for recycling.

Description

Technical Field

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

[0002] The current PEM water electrolysis hydrogen production system has certain requirements for water quality, which means that the equipment often needs to be used in conjunction with a pure water machine specifically for water purification. This will lead to the following situations: ① Increased floor space: In addition to reserving area for hydrogen production equipment at the project site, the floor space of the pure water machine also needs to be considered; ② Additional connecting pipes are required: The hydrogen production equipment and the pure water machine are independent of each other, and often require pipes to connect them. If you want to check the status of the pure water machine through the hydrogen production equipment, you often need the pure water machine manufacturer to provide a communication line to connect to the hydrogen production equipment; ③ Both the pure water machine and the hydrogen production equipment produce wastewater, which can actually be recycled.

[0003] In view of this, the present invention provides a water circulation system for producing hydrogen by PEM electrolysis of water to meet the above requirements. Utility Model Content

[0004] To achieve the above objectives, the present invention provides the following technical solutions: a water circulation system for producing hydrogen by PEM electrolysis of water, comprising:

[0005] The raw water tank, whose water inlet is connected to the municipal water line through a solenoid valve, is used to store municipal water;

[0006] A pretreatment system, the water inlet of which is connected to the water outlet of the raw water tank via a DC pump, for primary treatment of municipal water;

[0007] A secondary treatment device, the water inlet of which is connected to the water outlet of the pretreatment system via a solenoid valve, for performing secondary treatment on municipal water;

[0008] A pressure tank, the water inlet of which is connected to the water outlet of the secondary treatment equipment via a booster pump;

[0009] The purification column, whose water inlet is connected to the water outlet of the pressure barrel through a solenoid valve, is used to purify municipal water;

[0010] A pure water tank, the water inlet of which is connected to the water outlet of the purification column through a solenoid valve, and is used to store purified municipal water;

[0011] A heat exchanger, the water inlet of which is connected to the water outlet of the pure water tank via a centrifugal pump;

[0012] The water inlet of the electrolytic cell is connected to the water outlet of the heat exchanger, and the water outlet is connected to the pure water tank to form a water circulation.

[0013] Preferably, liquid level sensors are provided inside the raw water tank and the pure water tank for real-time monitoring of the liquid level in the tank and controlling the opening and closing of the solenoid valves in the corresponding pipelines.

[0014] Preferably, the pretreatment system comprises: a PP cotton filter element, a UDF activated carbon filter element and a CTO granular activated carbon filter element connected in series.

[0015] Preferably, the secondary treatment equipment is a RO reverse osmosis membrane.

[0016] Preferably, a filter is connected between the pure water tank and the centrifugal pump to prevent large particles of impurities in the pure water from entering the centrifugal pump.

[0017] Preferably, the pure water tank is further provided with a temperature sensor and a hydrogen-in-oxygen sensor, which are used to detect the temperature of the pure water in the pure water tank and the content of hydrogen in the pure water tank respectively.

[0018] Preferably, the pure water tank is also equipped with an oxygen extraction blower for extracting hydrogen from the pure water tank.

[0019] Preferably, a water quality sensor is further connected to the water inlet end of the solenoid valve located between the purification column and the pure water tank, and the purification column is connected to the raw water tank through a pipeline between the water quality sensor and the solenoid valve.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] This utility model integrates the circulating water circuit of the water purifier and the hydrogen production equipment, thereby reducing the occupied area and reducing the difficulty of on-site installation. At the same time, it also enables the PEM electrolysis water hydrogen production system to directly use municipal water as raw material, and optimizes the integration of the pipeline between the PEM electrolysis water hydrogen production system and the water purifier. Wastewater can also be discharged into the pure water tank for recycling, saving water. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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:

[0023] Figure 1 It is a schematic diagram of the principle of the present utility model.

[0024] In the figure: 1. Raw water tank; 2. Pretreatment system; 3. Secondary treatment equipment; 4. Pressure tank; 5. Purification column; 6. Pure water tank; 7. Centrifugal pump; 8. Heat exchanger; 9. Electrolyzer; 10. Oxygen extraction fan; 11. DC pump; 12. Booster pump; 13. Filter; 14. First water supply solenoid valve; 15. Water inlet solenoid valve; 151. First pressure sensor; 16. Pure water solenoid valve; 17. Second water supply solenoid valve; 171. Second water quality sensor; 18. Electric ball valve; 181. Second pressure sensor; 19. Drain pipe; 20. Manual drain valve; 21. Drain solenoid valve; 22. Third pressure sensor; 23. Third water quality sensor; 24. Flow meter. DETAILED DESCRIPTION

[0025] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] See also Figure 1 The utility model relates to a water circulation system for hydrogen production by PEM water electrolysis, comprising: a raw water tank 1, a pretreatment system 2 whose water inlet end is connected to a water outlet pipe of the raw water tank 1 through a DC pump 11, a secondary treatment device 3 whose water inlet end is connected to a water outlet pipe of the pretreatment system 2 through a water inlet solenoid valve 15, a pressure barrel 4 whose water inlet end is connected to a water outlet pipe of the secondary treatment device 3 through a booster pump 12, a purification column 5 connected to a water outlet pipe of the pressure barrel 4 through a pure water solenoid valve 16, a pure water tank 6 whose water inlet end is connected to a water outlet pipe of the purification column 5 through a second water supply solenoid valve 17, a heat exchanger 8 whose water inlet end is connected to a water outlet pipe of the pure water tank 6 through a centrifugal pump 7, and an electrolyzer 9 whose water inlet end is connected to a water outlet pipe of the heat exchanger 8 and whose water outlet pipe is connected to the pure water tank 6.

[0027] The raw water tank 1 is connected to the municipal water line through the first water supply solenoid valve 14, and a liquid level sensor is provided therein to control the opening and closing of the first water supply solenoid valve 14, so that municipal water enters the raw water tank 1 for storage and use;

[0028] The pretreatment system 2 comprises a PP cotton filter element, a UDF activated carbon filter element, and a CTO granular activated carbon filter element connected in series. The filter element is primarily used to treat suspended solids in municipal water and adsorb residual chlorine in the municipal water to prevent these substances from clogging the secondary treatment device 3. A first pressure sensor 151 is also provided at the water inlet end of the water inlet solenoid valve 15 between the pretreatment system 2 and the secondary treatment device 3. The first pressure sensor 151 is used to control the opening and closing of the water inlet solenoid valve 15 (i.e., when the pressure is high, the water inlet solenoid valve 15 is opened, and vice versa). In this embodiment, the secondary treatment device 3 is preferably an RO reverse osmosis membrane, which primarily adsorbs metal ions from the non-desalted portion of the reverse osmosis membrane.

[0029] A second water quality sensor 171 is further connected to the water inlet of the second water supply solenoid valve 17 located between the purification column 5 and the pure water tank 6. Furthermore, a pipeline is provided between the second water quality sensor 171 and the second water supply solenoid valve 17, and the purification column 5 is connected to the raw water tank 1, for discharging water with substandard water quality into the raw water tank 1 for recirculation and purification. Specifically, when the second water quality sensor 171 detects that the purified water quality is substandard, the second water supply solenoid valve 17 is disconnected, and the purified water enters the raw water tank 1 through the pipeline for secondary purification and filtration to meet the water quality requirements for electrolytic hydrogen production.

[0030] A filter 13 is further connected between the pure water tank 6 and the centrifugal pump 7. In this embodiment, the filter 13 is a Y-type filter for filtering large particles of impurities in the pure water to prevent the large particles of impurities in the pure water from entering the centrifugal pump 7.

[0031] A temperature sensor (not marked in the figure) and a hydrogen-in-oxygen sensor (not marked in the figure) are provided in the pure water tank 6, which are used to detect the temperature of the pure water in the pure water tank 6 and the hydrogen content in the pure water tank 6, respectively. A liquid level sensor is also provided in the pure water tank 6 for real-time monitoring of the liquid level in the tank. At the same time, it can also control the opening and closing of the second water supply solenoid valve 17 between the pure water tank 6 and the purification column 5. When the pure water in the pure water tank 6 reaches the liquid level, the second water supply solenoid valve 17 is disconnected, so that the water purified by the purification column 5 no longer flows into the pure water tank 6;

[0032] In addition, an oxygen extraction fan 10 is installed on the top surface of the pure water tank 6 to extract the hydrogen in the pure water tank 6 to prevent the accumulation of hydrogen in the pure water tank 6.

[0033] In addition, the pure water tank 6 and the raw water tank 1 are also connected through a drain pipe 19, and a manual drain valve 20 is provided on the drain pipe 19 for controlling the on and off of the drain pipe 19. The drain pipe 19 is also connected to the pipe between the centrifugal pump 7 and the heat exchanger 8 through a drain solenoid valve 21, so that the pure water discharged by the centrifugal pump 7 can enter the drain pipe 19 through the drain solenoid valve 21 to return to the raw water tank 1 for circulation purification to improve the water quality. It should be noted here that the drain solenoid valve 21 and the manual drain valve 20 are staggered to ensure that the on and off of the manual drain valve 20 will not affect the pure water discharged by the centrifugal pump 7 entering the raw water tank 1.

[0034] In this embodiment, the heat exchanger 8 is a plate-type heat exchanger, and the cooling water inlet end thereof is sequentially connected to an electric ball valve 18 and a second pressure sensor 181, which cooperate with the temperature sensor provided in the pure water tank 6 to control the flow rate of the cooling water inlet end and detect the water pressure at the cooling water inlet end, respectively. That is, when the temperature sensor in the pure water tank 6 detects a high temperature, the electric ball valve 18 is fully opened, allowing more cooling water to enter the heat exchanger 8 for heat exchange with the pure water for hydrogen production, thereby reducing the temperature of the pure water for hydrogen production and maintaining it at an appropriate temperature, for example, between 4°C and 80°C. At this temperature, the activity of water molecules is high, which is conducive to the electrolysis reaction, thereby improving the efficiency and output of hydrogen production. Conversely, the entry of cooling water is reduced to reduce energy consumption.

[0035] A third water quality sensor 23 is installed on the connecting pipeline between the heat exchanger 8 and the electrolyzer 9 to detect the water quality of the pure water for hydrogen production. If the water quality is unqualified, the water in the pure water tank 6 will no longer flow into the electrolyzer 9, but will be discharged into the raw water tank 1 through the drainage pipeline 19 for circulation and reprocessing and purification until the water quality requirements for hydrogen production are met. At the same time, a flow meter 24 and a third pressure sensor 22 can also be optionally installed to better understand the operating status and data of the electrolyzer 9.

[0036] When used specifically: municipal water enters the raw water tank 1 through the solenoid valve, and the opening and closing of the solenoid valve can be controlled by the liquid level sensor in the raw water tank 1, that is: when the liquid level is high, the solenoid valve is disconnected, otherwise the solenoid valve is closed; then it passes through the pre-treatment system 2 and the secondary treatment equipment 3 through the DC pump 11, and the booster pump 12 sends the preliminary purified water to the pressure barrel 4. After a certain amount of water is stored in the pressure barrel 4, it enters the purification column 5 for further purification. If the water quality is unqualified, it is discharged into the raw water tank 1 for re-purification. Purification, otherwise it enters the pure water tank 6, and passes through the Y-type filter, centrifugal pump 7 and heat exchanger 8 into the electrolyzer 9 for hydrogen production. The produced hydrogen goes to the subsequent hydrogen purification system, while water and oxygen return to the pure water tank 6. The cooling water flow of the heat exchanger 8 can be controlled according to the temperature sensor data in the pure water tank 6 to control the water temperature of the circulating water circuit. According to the monitoring data of the hydrogen in oxygen sensor, the operation of the oxygen extraction fan 10 can be controlled to extract the hydrogen in the pure water tank 6 to prevent accumulation.

[0037] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A water circulation system for producing hydrogen by PEM electrolysis of water, characterized in that: include: A raw water tank (1), the water inlet of which is connected to the municipal water line via a solenoid valve and is used to store municipal water; A pretreatment system (2), the water inlet of which is connected to the water outlet of the raw water tank (1) via a DC pump (11), for performing primary treatment on municipal water; A secondary treatment device (3), the water inlet of which is connected to the water outlet of the pretreatment system (2) via a solenoid valve, for performing secondary treatment on municipal water; A pressure barrel (4), the water inlet of which is connected to the water outlet of the secondary treatment equipment (3) via a booster pump (12); A purification column (5), the water inlet of which is connected to the water outlet of the pressure barrel (4) via a solenoid valve, for purifying municipal water; A pure water tank (6), the water inlet of which is connected to the water outlet of the purification column (5) via a solenoid valve, and is used to store purified municipal water; A heat exchanger (8), the water inlet of which is connected to the water outlet of the pure water tank (6) via a centrifugal pump (7); The electrolytic cell (9) has a water inlet connected to the water outlet of the heat exchanger (8), and its water outlet is connected to the pure water tank (6) to form a water cycle.

2. The water circulation system for producing hydrogen by PEM water electrolysis according to claim 1, characterized in that: Liquid level sensors are provided inside the raw water tank (1) and the pure water tank (6) for real-time monitoring of the liquid level in the tank and controlling the opening and closing of the electromagnetic valves in the corresponding pipelines.

3. The water circulation system for producing hydrogen by PEM water electrolysis according to claim 1, characterized in that: A first pressure sensor (151) for controlling the opening and closing of the solenoid valve is also provided at the water inlet end of the solenoid valve located between the pretreatment system (2) and the secondary treatment equipment (3); The pretreatment system (2) comprises: a PP cotton filter element, a UDF activated carbon filter element and a CTO granular activated carbon filter element connected in series.

4. The water circulation system for producing hydrogen by PEM water electrolysis according to claim 1, characterized in that: The secondary treatment equipment (3) is a RO reverse osmosis membrane.

5. The water circulation system for producing hydrogen by PEM water electrolysis according to claim 1, characterized in that: A filter (13) is also connected between the pure water tank (6) and the centrifugal pump (7) to prevent large particles of impurities in the pure water from entering the centrifugal pump (7).

6. The water circulation system for producing hydrogen by PEM water electrolysis according to claim 1, characterized in that: The pure water tank (6) is also provided with a temperature sensor and an oxygen-hydrogen sensor, which are used to detect the temperature of the pure water in the pure water tank (6) and the content of hydrogen in the pure water tank (6), respectively.

7. The water circulation system for producing hydrogen by PEM water electrolysis according to claim 1, characterized in that: The pure water tank (6) is also equipped with an oxygen extraction blower (10) for extracting hydrogen from the pure water tank (6).

8. The water circulation system for producing hydrogen by PEM water electrolysis according to claim 1, characterized in that: The water inlet end of the solenoid valve located between the purification column (5) and the pure water tank (6) is also connected to a second water quality sensor (171), and between the second water quality sensor (171) and the solenoid valve, the purification column (5) is connected to the raw water tank (1) through a pipeline.

9. The water circulation system for producing hydrogen by PEM water electrolysis according to claim 1, characterized in that: The pure water tank (6) and the raw water tank (1) are also connected via a drainage pipeline (19), and a manual drainage valve (20) is also provided on the drainage pipeline (19).

10. The water circulation system for producing hydrogen by PEM water electrolysis according to claim 9, characterized in that: The drainage pipeline (19) is also connected to the pipeline between the centrifugal pump (7) and the heat exchanger (8) through a drainage solenoid valve (21) staggered with the manual drainage valve (20).

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