A condensate water recycling system of a water electrolysis hydrogen production device

Abstract

This invention provides a condensate recovery and utilization system for a water electrolysis hydrogen production device, comprising a hydrogen production device, a hydrogen purification device, a first water collection tank, a second water collection tank, and a raw material water tank. The first water collection tank is equipped with a pure water inlet, a drain outlet, a first exhaust pipe, a second exhaust pipe, and a self-regulating valve connecting to nitrogen. The first water collection tank also contains a level gauge, a first level transmitter, a pressure gauge, and a pressure transmitter. The drain outlet of the first water collection tank is connected to the second water collection tank via a drain pipe equipped with a first pneumatic valve. The first level transmitter is electrically connected to the first pneumatic valve. This invention, through the sequential connection of the first water collection tank, the second water collection tank, the centrifugal pump, and the raw material water tank, achieves condensate recovery and recycling, reducing production costs and environmental pollution. Furthermore, it allows for real-time control of the pressure and level within the first water collection tank within a suitable range, ensuring safe hydrogen emission and significantly improving system operational safety.

Description

Technical Field

[0001] This utility model relates to the field of water electrolysis hydrogen production technology, and in particular to a condensate recovery and utilization system for a water electrolysis hydrogen production device. Background Technology

[0002] In the alkaline water electrolysis hydrogen production process, the hydrogen production unit generates hydrogen and oxygen containing a significant amount of water, while the hydrogen purification unit also produces condensate. In previous small-scale projects, the condensate recovery value was low, and it was often directly discharged. However, with the increasing scale of projects, condensate recovery and reuse have significant economic value.

[0003] Currently, because the hydrogen-side condensate contains trace amounts of hydrogen, it is first discharged into a water-sealed tank. This tank has an inner and outer cylinder structure; water overflows from the inner cylinder, while hydrogen from the outer cylinder is released into the atmosphere through a vent pipe and flame arrester. However, since the condensate contains trace amounts of alkaline solution, direct discharge from the water-sealed tank not only wastes condensate and increases costs but also causes environmental pollution. Furthermore, the water-sealed tank's structure is too simple to guarantee the safe discharge of hydrogen, posing a safety hazard. Utility Model Content

[0004] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a condensate recovery and utilization system for a water electrolysis hydrogen production device, which can realize the recovery and reuse of condensate, reduce costs, protect the environment, ensure the safe emission of hydrogen, and eliminate the safety hazards in the prior art.

[0005] To achieve the above and other related objectives, this utility model provides a condensate recovery and utilization system for a water electrolysis hydrogen production device, including a hydrogen production device, a hydrogen purification device, a first water collection tank, a second water collection tank, and a raw material water tank. The condensate from the hydrogen production device and the condensate from the hydrogen purification device are collected through pipelines and connected to the first water collection tank. The condensate from the oxygen side of the hydrogen production device is discharged to the second water collection tank. The second water collection tank is connected to the raw material water tank through a centrifugal pump. The raw material water tank is connected to the water supply port of the hydrogen production device.

[0006] The first water collection tank is equipped with a pure water inlet, a drain outlet, a first exhaust pipe, a second exhaust pipe, and a self-regulating valve for connecting nitrogen. The first water collection tank is also equipped with a level gauge, a first level transmitter, a pressure gauge, and a pressure transmitter. The drain outlet of the first water collection tank is connected to the second water collection tank through a drain pipe equipped with a first pneumatic valve. The first level transmitter is electrically connected to the first pneumatic valve.

[0007] In one embodiment of the present invention, a second pneumatic valve is provided on the first exhaust pipe, and the pressure transmitter is electrically connected to the second pneumatic valve.

[0008] In one embodiment of this utility model, a safety valve is provided on the second exhaust pipe for overpressure protection.

[0009] In one embodiment of the present invention, a flame arrester and a vent pipe are provided at the end of the first exhaust pipe and the second exhaust pipe after they converge, and the flame arrester is located at a high point.

[0010] In one embodiment of the present invention, a regulating valve is also installed on the drainage pipe, and the first liquid level transmitter is electrically connected to the regulating valve.

[0011] In one embodiment of the present invention, the first water collection tank is provided with a pressure detection pipe communicating with its interior, and the pressure gauge and pressure transmitter are sequentially arranged on the pressure detection pipe.

[0012] In one embodiment of this utility model, the first water collection tank is also equipped with a thermometer.

[0013] In one embodiment of the present invention, a second level transmitter is provided on the second water collection tank, and the second level transmitter is electrically connected to the centrifugal pump.

[0014] In one embodiment of the present invention, the bottom of the first water collection tank and the second water collection tank are respectively provided with a sewage discharge pipe, and the sewage discharge pipe is provided with a ball valve.

[0015] As described above, the condensate recovery and utilization system of the water electrolysis hydrogen production device of this utility model has the following beneficial effects:

[0016] (1) In this utility model, the first water collection tank is connected to the second water collection tank through a drainage pipe. The second water collection tank uses a centrifugal pump to transport the condensate to the raw material water tank for recycling, and then sends it to the hydrogen production device for recycling. This realizes the recycling and reuse of condensate, reduces production costs, and reduces environmental pollution.

[0017] (2) This utility model controls the pressure in the first water collection tank in real time within a suitable range through a pressure transmitter, a second pneumatic valve and a self-regulating valve, and controls the liquid level in the first water collection tank in real time within a suitable range through a first liquid level transmitter, a first pneumatic valve and a regulating valve, thereby preventing hydrogen from entering the upstream and downstream, effectively ensuring the safe discharge of hydrogen, and greatly improving the safety of the system operation. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the condensate recovery and utilization system of the water electrolysis hydrogen production device disclosed in this utility model.

[0019] Component designation explanation

[0020] 1. Hydrogen production unit; 2. Hydrogen purification unit; 3. First water collection tank; 4. Pure water inlet; 5. Thermometer; 6. Level gauge; 7. First level transmitter; 8. Pressure gauge; 9. Pressure transmitter; 10. Second pneumatic valve; 11. Safety valve; 12. Flame arrester; 13. Vent pipe; 14. Self-regulating valve; 15. First pneumatic valve; 16. Regulating valve; 17. Second water collection tank; 18. Second level transmitter; 19. Centrifugal pump; 20. Raw material water tank. Detailed Implementation

[0021] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. It should be noted that, unless otherwise specified, the following embodiments and features described herein can be combined with each other.

[0022] Please see Figure 1 This utility model provides a condensate recovery and utilization system for a water electrolysis hydrogen production device, including a hydrogen production device 1, a hydrogen purification device 2, a first water collection tank 3, a second water collection tank 17, and a raw material water tank 20. The hydrogen production device 1 is provided with a hydrogen-side condensate outlet, an oxygen-side condensate outlet, and a water inlet. The hydrogen-side condensate from the hydrogen production device 1 and the condensate from the hydrogen purification device 2 are collected through pipelines and connected to the first water collection tank 3. The oxygen-side condensate from the hydrogen production device 1 is discharged to the second water collection tank 17. The second water collection tank 17 is connected to the raw material water tank 20 through a centrifugal pump 19. The raw material water tank 20 is connected to the water inlet of the hydrogen production device 1.

[0023] The first water collection tank 3 is equipped with a pure water inlet 4, a drain outlet, a first exhaust pipe, a second exhaust pipe, and a self-regulating valve 14 that connects to nitrogen. The self-regulating valve 14 can automatically replenish nitrogen to the first water collection tank 3 to a set pressure. The first water collection tank 3 is also equipped with a level gauge 6, a first level transmitter 7, a pressure gauge 8, and a pressure transmitter 9. The drain outlet of the first water collection tank 3 is connected to the second water collection tank 17 through a drain pipe equipped with a first pneumatic valve 15. The first level transmitter 7 is electrically connected to the first pneumatic valve 15 and is used to control the first pneumatic valve 15 to open when the liquid level reaches a high set value, so as to discharge the condensate recovered in the first water collection tank 3 to the second water collection tank 17. The condensate is then pumped to the raw material water tank 20 through the second water collection tank 17 and the centrifugal pump 19, thereby realizing the recycling and reuse of condensate.

[0024] Furthermore, a second pneumatic valve 10 is installed on the first exhaust pipe, and the pressure transmitter 9 is electrically connected to the second pneumatic valve 10. The pressure gauge 8 and the pressure transmitter 9 monitor the pressure in the first water collection tank 3 in real time. When the pressure in the tank reaches the high set value, the second pneumatic valve 10 is controlled to open and exhaust the air to avoid excessive pressure causing safety hazards; when the pressure in the tank reaches the low set value, the second pneumatic valve 10 is controlled to close to maintain the pressure in the tank within the normal operating range.

[0025] Furthermore, a safety valve 11 is provided on the second exhaust pipe for overpressure protection to avoid safety hazards.

[0026] Furthermore, a flame arrester 12 and a vent pipe 13 are sequentially provided at the end of the first exhaust pipe and the second exhaust pipe after they converge. The flame arrester 12 is located at a high point, which can not only effectively prevent backfire, but also facilitate the emission of hydrogen, thereby achieving safe emission of hydrogen.

[0027] Furthermore, a regulating valve 16 is installed on the drainage pipe, and the first level transmitter 7 is electrically connected to the regulating valve 16. The first pneumatic valve 15 on the drainage pipe controls the opening and closing of the drainage pipe based on the feedback of the liquid level information in the first water collection tank 3. When it is open, the regulating valve 16 can adjust the flow rate according to the feedback of the liquid level information, so that the liquid levels in the first water collection tank 3 and the second water collection tank 17 are both within a suitable range, enabling the system to adapt to different working conditions and maintain a good operating state.

[0028] Furthermore, the first water collection tank 3 is provided with a pressure detection pipe connected to its interior, and the pressure gauge 8 and pressure transmitter 9 are sequentially installed on the pressure detection pipe.

[0029] Furthermore, the first water collection tank 3 is also equipped with a thermometer 5.

[0030] Furthermore, a second level transmitter 18 is provided on the second water collection tank 17, and the second level transmitter 18 is electrically connected to the centrifugal pump 19. The second level transmitter 18 monitors the liquid level in the second water collection tank 17 in real time. When the liquid level reaches a high set value, it controls the centrifugal pump 19 to start and discharge the condensate to the raw material water tank 20; when the liquid level reaches a low set value, it controls the centrifugal pump 19 to shut down.

[0031] Furthermore, the bottom of the first water collection tank 3 and the second water collection tank 17 are respectively provided with sewage pipes, and ball valves are provided on the sewage pipes.

[0032] Working principle:

[0033] (1) Condensate collection: The condensate from the hydrogen side of the hydrogen production unit 1 and the condensate from the hydrogen purification unit are collected and discharged into the first water collection tank 3. The condensate from the oxygen side of the hydrogen production unit 1 is directly discharged into the second water collection tank 17.

[0034] (2) Control of the first water collection tank 3: When the first water collection tank 3 is used for the first time, it is replenished with water through the pure water inlet 4. During operation, the pressure transmitter 9 monitors the pressure inside the tank in real time. When the pressure reaches the high set value, it controls the second pneumatic valve 10 to open and exhaust air. When the pressure reaches the low set value, it controls the second pneumatic valve 10 to close. When the pressure inside the tank is too low, the self-regulating valve 14 automatically replenishes nitrogen into the tank to the set pressure. The first liquid level transmitter 7 monitors the liquid level in real time. When the liquid level reaches the high set value, it controls the first pneumatic valve 15 to open and drain water, and the regulating valve 16 controls the opening degree. When the liquid level reaches the low set value, it controls the first pneumatic valve 15 to close.

[0035] (3) Control of the second water collection tank 17: The second water collection tank 17 is an atmospheric pressure vessel. The second liquid level transmitter 18 monitors the liquid level in the second water collection tank 17 in real time. When the liquid level reaches the high set value, the centrifugal pump 19 is controlled to start and discharge the condensate to the raw material water tank 20. When the liquid level reaches the low set value, the centrifugal pump 19 is controlled to shut down.

[0036] In summary, this invention, by setting up a first water collection tank, a second water collection tank, a centrifugal pump, and a raw material water tank connected in sequence, achieves condensate recovery and recycling, reducing production costs and environmental pollution. Furthermore, it controls the pressure and liquid level in the first water collection tank in real time within a suitable range, ensuring the safe emission of hydrogen and greatly improving the safety of system operation. Therefore, this invention effectively overcomes the various shortcomings of existing technologies and has high industrial application value.

[0037] The terms used in this specification, such as "upper", "lower", "left", "right", "front", "back", "middle" and "one", are merely for clarity of description and are not intended to limit the scope of implementation of this utility model. Any changes or adjustments to their relative relationships, without substantially altering the technical content, shall also be considered within the scope of implementation of this utility model.

[0038] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit this utility model. All equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A condensate water recycling system for a water electrolysis hydrogen generation device, characterized by, The device includes a hydrogen production unit, a hydrogen purification unit, a first water collection tank, a second water collection tank, and a raw material water tank. The hydrogen-side condensate from the hydrogen production unit and the condensate from the hydrogen purification unit are collected through pipelines and connected to the first water collection tank. The oxygen-side condensate from the hydrogen production unit is discharged to the second water collection tank. The second water collection tank is connected to the raw material water tank through a centrifugal pump. The raw material water tank is connected to the water supply port of the hydrogen production unit. The first water collection tank is equipped with a pure water inlet, a drain outlet, a first exhaust pipe, a second exhaust pipe, and a self-regulating valve for connecting nitrogen. The first water collection tank is also equipped with a level gauge, a first level transmitter, a pressure gauge, and a pressure transmitter. The drain outlet of the first water collection tank is connected to the second water collection tank through a drain pipe equipped with a first pneumatic valve. The first level transmitter is electrically connected to the first pneumatic valve.

2. The condensate water recycling system of a water electrolysis hydrogen generation device according to claim 1, characterized by, The first exhaust pipe is equipped with a second pneumatic valve, and the pressure transmitter is electrically connected to the second pneumatic valve.

3. The condensate water recycling system of a water electrolysis hydrogen generation device according to claim 1, characterized by, The second exhaust pipe is equipped with a safety valve for overpressure protection.

4. The condensate water recycling system of a water electrolysis hydrogen generation device according to claim 1, characterized by, The first exhaust pipe and the second exhaust pipe are connected at their ends and are equipped with a flame arrester and a vent pipe. The flame arrester is located at a high point.

5. A condensate recovery and utilization system for a water electrolysis hydrogen production device according to claim 1, characterized in that, A regulating valve is also installed on the drainage pipe, and the first level transmitter is electrically connected to the regulating valve.

6. The condensate recovery and utilization system of a water electrolysis hydrogen production device according to claim 1, characterized in that, The first water collection tank is equipped with a pressure detection pipe that is connected to its interior, and the pressure gauge and pressure transmitter are sequentially installed on the pressure detection pipe.

7. A condensate recovery and utilization system for a water electrolysis hydrogen production device according to claim 1, characterized in that, The first water collection tank is also equipped with a thermometer.

8. A condensate recovery and utilization system for a water electrolysis hydrogen production apparatus according to any one of claims 1 to 7, characterized in that, The second water collection tank is equipped with a second level transmitter, which is electrically connected to the centrifugal pump.

9. A condensate recovery and utilization system for a water electrolysis hydrogen production device according to claim 8, characterized in that, The bottom of the first and second water collection tanks are respectively equipped with sewage pipes, and ball valves are installed on the sewage pipes.

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