Condensate recovery system of electrolytic hydrogen production device

Abstract

The utility model provides a condensate recovery system of an electrolytic hydrogen production device, which belongs to the technical field of water electrolysis hydrogen production and comprises a hydrogen side condensate recovery subsystem and an oxygen side condensate recovery subsystem. The hydrogen side condensate recovery subsystem comprises a hydrogen side drainer, a liquid phase outlet of the hydrogen side gas-water separator is connected with an inlet of the hydrogen side drainer through a hydrogen side drainage pipeline, and an outlet of the hydrogen side drainer is connected with a condensate inlet of the hydrogen separator through a hydrogen side drainage pipeline; the oxygen side condensate recovery subsystem comprises an oxygen side drainer, a liquid phase outlet of the oxygen side gas-water separator is connected with an inlet of the oxygen side drainer through an oxygen side drainage pipeline, and an outlet of the oxygen side drainer is connected with a condensate inlet of the oxygen separator through an oxygen side drainage pipeline. According to the system, the drainer is arranged, so that low-cost, efficient, safe and pollution-free condensate recovery and zero emission of electrolytic hydrogen production are realized, and the problems that the water supplementing amount, the alkali liquor supplementing amount and the production cost are increased due to the fact that the condensate is not recovered in the prior art are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of water electrolysis hydrogen production, in particular to a condensate recovery system of an electrolysis hydrogen production device. Background Art

[0002] Hydrogen is considered the most ideal energy carrier due to its advantages such as being green, low-carbon, efficient, storable and transportable. Currently, commercial water electrolysis hydrogen production technology routes mainly include alkaline water electrolysis hydrogen production and PEM (proton exchange membrane) water electrolysis hydrogen production. In the alkaline water electrolysis hydrogen production process, a 25-30% alkaline solution such as KOH is required as the electrolyte, while PEM water electrolysis hydrogen production requires pure water as the electrolyte. Therefore, both the alkaline water electrolysis hydrogen production system and the PEM water electrolysis hydrogen production system involve the problem of condensate discharge and recovery.

[0003] Condensate generated in a hydrogen electrolysis system refers to the alkali and / or water vapor carried along by the electrolyzed hydrogen and oxygen as they flow through pipes or containers, forming a liquid. Direct current decomposes the water in the electrolyzer into 1 part hydrogen and 1 / 2 part oxygen. The resulting hydrogen and oxygen, along with the electrolyte, are then transported to the separation frame for separation. The hydrogen and oxygen are cooled in the hydrogen-side and oxygen-side coolers, respectively, and dehydrated in the gas-liquid and gas-water separators. In the prior art, after hydrogen / oxygen is cooled in the hydrogen / oxygen side cooler, a large amount of saturated liquid water will condense. This liquid water will enter the gas-water separator along with the hydrogen / oxygen. In the related art, only the recovery of the electrolyte and the water in the hydrogen / oxygen side cooler is involved, and the recovery of the condensate produced after the gas-water separation is not involved. The condensate produced after the gas-water separation is often not recycled. Usually, in the gas-water separator on the hydrogen / oxygen side, the separated condensate is transported to the water seal through a pipeline for drainage. The drainage system includes at least two water seals, which also include corresponding supporting components, such as condensate drainage valves, flame arresters, connecting pipes, and water seal water supply pipes. If the drainage is automatic, corresponding electrical modules, such as electrical converters and PLC analog output points, must be added, which will increase the cost of condensate discharge. In addition, the process is complicated and will cause corresponding pollution to the environment. It also causes waste of water resources, thereby increasing the water replenishment amount, alkali solution replenishment amount and production cost of the entire electrolytic hydrogen production device. In addition, for some special industries (such as electrolysis of heavy water to produce hydrogen), the condensate discharged is also radioactive and has certain hazards to the human body. If it is discharged directly outdoors, it will also cause environmental pollution and threaten human health. Utility Model Content

[0004] The utility model provides a condensate recovery system for an electrolytic hydrogen production device, which is used to solve the problem in the prior art that the electrolytic hydrogen production device cannot effectively recycle the condensate, thereby causing waste of water resources, increasing the water replenishment amount of the electrolytic hydrogen production device, and increasing production costs.

[0005] The utility model provides a condensate recovery system for an electrolytic hydrogen production device, comprising: a hydrogen side condensate recovery subsystem and an oxygen side condensate recovery subsystem; the hydrogen side condensate recovery subsystem comprises a hydrogen side drainer, a hydrogen side drainage pipeline, and a hydrogen side drainage pipeline; the inlet of the hydrogen side drainer is connected to the liquid phase outlet of a hydrogen side gas-water separator through the hydrogen side drainage pipeline, the gas phase outlet of the hydrogen side gas-water separator is connected to the hydrogen pipeline, the inlet of the hydrogen side gas-water separator is connected to the gas phase outlet of a hydrogen side gas cooler, and the liquid phase outlet of the hydrogen side gas cooler is connected to the coolant inlet of the hydrogen separator through a cooler reflux pipeline; the hydrogen side drainer The outlet is connected to the condensate inlet of the hydrogen separator through the hydrogen side drainage pipe; the oxygen side condensate recovery subsystem includes an oxygen side drainer, an oxygen side drainage pipe, and an oxygen side drainage pipe; the inlet of the oxygen side drainer is connected to the liquid phase outlet of the oxygen side gas-water separator through the oxygen side drainage pipe, the gas phase outlet of the oxygen side gas-water separator is connected to the oxygen pipe, the inlet of the oxygen side gas-water separator is connected to the gas phase outlet of the oxygen side gas cooler, and the liquid phase outlet of the oxygen side gas cooler is connected to the coolant inlet of the oxygen separator through the cooler reflux pipe; the outlet of the oxygen side drainer is connected to the condensate inlet of the oxygen separator through the oxygen side drainage pipe.

[0006] Preferably, the installation position of the hydrogen side gas-water separator is not lower than the hydrogen side drainer, and the installation position of the hydrogen side drainer is not lower than the hydrogen separator; the installation position of the oxygen side gas-water separator is not lower than the oxygen side drainer, and the installation position of the oxygen side drainer is not lower than the oxygen separator.

[0007] Preferably, a hydrogen side drain valve is provided on the hydrogen side drain pipe, and a hydrogen side liquid drain valve is provided on the hydrogen side drain pipe; wherein, at most one of the hydrogen side drain valve and the hydrogen side liquid drain valve is in an open state; an oxygen side drain valve is provided on the oxygen side drain pipe, and an oxygen side liquid drain valve is provided on the oxygen side drain pipe; wherein, at most one of the oxygen side drain valve and the oxygen side liquid drain valve is in an open state.

[0008] Preferably, a hydrogen side balancing pipe is arranged between the hydrogen side drainage pipe located on the rear side of the hydrogen side drainage valve and the hydrogen side liquid drainage pipe located on the rear side of the hydrogen side drain valve; the installation position of the hydrogen side balancing pipe is higher than the hydrogen side liquid drainage pipe; a hydrogen side balancing valve is arranged on the hydrogen side balancing pipe; the hydrogen side balancing valve and the hydrogen side liquid drainage valve are maintained in the same opening and closing state.

[0009] Preferably, an oxygen side balancing pipe is arranged between the oxygen side drainage pipe located at the rear side of the oxygen side drainage valve and the oxygen side liquid drainage pipe located at the rear side of the oxygen side drain valve; the installation position of the oxygen side balancing pipe is higher than the oxygen side liquid drainage pipe; an oxygen side balancing valve is arranged on the oxygen side balancing pipe; the oxygen side balancing valve and the oxygen side liquid drainage valve are kept in the same opening and closing state.

[0010] Preferably, a first hydrogen side liquid level gauge is provided in the hydrogen side gas-water separator, and a second hydrogen side liquid level gauge is provided in the hydrogen side drainer; a first oxygen side liquid level gauge is provided in the oxygen side gas-water separator, and a second oxygen side liquid level gauge is provided in the oxygen side drainer; wherein the liquid level height of the condensate in the hydrogen side drainer and the oxygen side drainer does not exceed 1 / 3 of the height of the hydrogen side drainer and the oxygen side drainer.

[0011] Preferably, the hydrogen side condensate recovery subsystem also includes a hydrogen side controller, which is electrically connected to the hydrogen side drain valve, the hydrogen side liquid drain valve, the hydrogen side balance valve, the hydrogen side first liquid level gauge, and the hydrogen side second liquid level gauge.

[0012] Preferably, the oxygen side condensate recovery subsystem further includes an oxygen side controller, which is electrically connected to the oxygen side drain valve, the oxygen side liquid discharge valve, the oxygen side balance valve, the oxygen side first liquid level gauge, and the oxygen side second liquid level gauge.

[0013] Preferably, liquid blockers are respectively provided on the hydrogen side drainage pipe between the hydrogen side drainage valve and the hydrogen side gas-water separator, and on the oxygen side drainage pipe between the oxygen side drainage valve and the oxygen side gas-water separator.

[0014] The condensate recovery system of the electrolytic hydrogen production device provided by the present invention realizes the recovery and reuse of the condensate by buffering the condensate separated by the hydrogen-side / oxygen-side gas-water separator through the hydrogen-side / oxygen-side drainer and finally transporting it to the hydrogen-side / oxygen separator. The opening sequence and time of each valve are controlled by the hydrogen-side / oxygen-side drain valve, the hydrogen-side / oxygen-side liquid discharge valve, the hydrogen-side / oxygen-side balancing valve, and the hydrogen-side / oxygen-side controller, thereby realizing zero emission of the electrolytic hydrogen production device, greatly reducing the amount of sewage discharged, reducing the loss of raw alkali solution and the amount of alkali solution replenished in the subsequent electrolysis process, avoiding the waste of water resources, and overcoming the problem of increased water replenishment amount, alkali solution replenishment amount and production cost caused by failure to recover the condensate generated by the gas-water separator in the prior art, thereby realizing high utilization rate of water resources.

[0015] The utility model replaces the traditional water seal with a hydrogen side condensate recovery subsystem and an oxygen side condensate recovery subsystem, and recovers and reuses the condensate in the electrolytic hydrogen production device to the greatest extent. The structural design is scientific and reasonable, and has the advantages of reducing production costs, improving recovery efficiency, and being safe and pollution-free. In the recovery process, pressure difference and gravity are used to discharge the liquid, which ensures the efficiency and convenience of condensate recovery. At the same time, the installation of power equipment such as a delivery pump is avoided, and the energy consumption of the equipment and production costs are effectively saved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 A schematic structural diagram of a condensate recovery system for an electrolytic hydrogen production device according to one embodiment of the present invention;

[0018] Figure 2 A schematic structural diagram of a condensate recovery system for an electrolytic hydrogen production device provided in another embodiment of the present invention;

[0019] Figure 3 This is a structural schematic diagram of a condensate recovery system for an electrolytic hydrogen production device provided in another embodiment of the present invention.

[0020] Description of reference numerals:

[0021] 100-electrolyzer, 200-hydrogen separator, 300-oxygen separator, 210-hydrogen side gas cooler, 220-hydrogen side gas-water separator, 230-hydrogen side drainer, 240-liquid blocker, 310-oxygen side gas cooler, 320-oxygen side gas-water separator, 330-oxygen side drainer, 231-hydrogen side drainage pipe, 232-hydrogen side liquid drainage pipe, 233-hydrogen side drainage valve, 234-hydrogen side liquid drainage valve, 235-hydrogen Side balancing pipeline, 236-hydrogen side balancing valve, 237-hydrogen side first liquid level gauge, 238-hydrogen side second liquid level gauge, 239-hydrogen side controller, 331-oxygen side drainage pipeline, 332-oxygen side drainage pipeline, 333-oxygen side drainage valve, 334-oxygen side discharge valve, 335-oxygen side balancing pipeline, 336-oxygen side balancing valve, 337-oxygen side first liquid level gauge, 338-oxygen side second liquid level gauge, 339-oxygen side controller. DETAILED DESCRIPTION

[0022] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described below. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts also fall within the scope of protection of the present invention.

[0023] like Figure 1 The utility model provides a condensate recovery system for an electrolytic hydrogen production device, comprising: a hydrogen side condensate recovery subsystem and an oxygen side condensate recovery subsystem; the hydrogen side condensate recovery subsystem comprises a hydrogen side drainer 230, a hydrogen side drainage pipe 231, and a hydrogen side drainage pipe 232; the inlet of the hydrogen side drainer 230 is connected to the liquid phase outlet of the hydrogen side gas-water separator 220 through the hydrogen side drainage pipe 231, the gas phase outlet of the hydrogen side gas-water separator 220 is connected to the hydrogen pipeline, the inlet of the hydrogen side gas-water separator 220 is connected to the gas phase outlet of the hydrogen side gas cooler 210, and the liquid phase outlet of the hydrogen side gas cooler 210 is connected to the coolant inlet of the hydrogen separator 200 through the cooler reflux pipe; the outlet of the hydrogen side drainer 230 is connected to the hydrogen side gas cooler 210 through the cooler reflux pipe. The hydrogen side drain pipe 232 is connected to the condensate inlet of the hydrogen separator 200; the oxygen side condensate recovery subsystem includes an oxygen side drainer 330, an oxygen side drain pipe 331, and an oxygen side drain pipe 332; the inlet of the oxygen side drainer 330 is connected to the liquid phase outlet of the oxygen side gas-water separator 320 through the oxygen side drain pipe 331, the gas phase outlet of the oxygen side gas-water separator 320 is connected to the oxygen pipe, the inlet of the oxygen side gas-water separator 320 is connected to the gas phase outlet of the oxygen side gas cooler 310, and the liquid phase outlet of the oxygen side gas cooler 310 is connected to the coolant inlet of the oxygen separator 300 through the cooler reflux pipe; the outlet of the oxygen side drainer 330 is connected to the condensate inlet of the oxygen separator 300 through the oxygen side drain pipe 332.

[0024] In the present invention, the entire electrolysis hydrogen production device includes the following equipment: an electrolytic cell 100, a hydrogen separator 200, an oxygen separator 300, a hydrogen side gas cooler 210, an oxygen side gas cooler 310, a hydrogen side gas-water separator 220, an oxygen side gas-water separator 320, a hydrogen side condensate recovery subsystem, and an oxygen side condensate recovery subsystem, etc. Some of the connection relationships are as follows: the hydrogen side outlet of the electrolyzer 100 is connected to the mixed phase inlet of the hydrogen separator 200, the gas phase outlet of the hydrogen separator 200 is connected to the inlet of the hydrogen side gas cooler 210, the gas phase outlet of the hydrogen side gas cooler 210 is connected to the inlet of the hydrogen side gas-water separator 220, and the liquid phase outlet of the hydrogen side gas cooler 210 is connected to the coolant inlet of the hydrogen separator 200 through a cooler reflux pipe; the oxygen side outlet of the electrolyzer 100 is connected to the mixed phase inlet of the oxygen separator 300, the gas phase outlet of the oxygen separator 300 is connected to the inlet of the oxygen side gas cooler 310, the gas phase outlet of the oxygen side gas cooler 310 is connected to the inlet of the oxygen side gas-water separator 320, and the liquid phase outlet of the oxygen side gas cooler 310 is connected to the coolant inlet of the oxygen separator 300 through a cooler reflux pipe. In addition, the condensate recovery system is mainly a system for separating the hydrogen and oxygen obtained from hydrogen production from the condensate, such as the alkali liquid circulation in the hydrogen / oxygen separator included in the electrolytic hydrogen production device and the hydrogen / oxygen pipeline transportation system. It is a conventional setting in the existing technology and will not be described in detail here.

[0025] The electrolyzer 100 is the main device for electrolyzing water to produce hydrogen and oxygen. Electrolytic tanks and other equipment can also be used. Their structures are all existing technologies and will not be described in detail here. The electrolyzer 100 generates oxygen and hydrogen by electrolyzing water through direct current from anode and cathode, and the oxygen and hydrogen enter their corresponding separators respectively. The hydrogen / oxygen separator is a device for separating the hydrogen and oxygen electrolyzed by the electrolyzer 100 from the alkali solution. While storing the alkali solution, it also stores the condensate from the hydrogen side / oxygen side gas cooler and the hydrogen side / oxygen side gas-water separator. The oxygen side / hydrogen side gas cooler 210 cools the hydrogen / oxygen separator to separate hydrogen and oxygen, and further condenses the water vapor carried by the gas to form a condensate, the cooling capacity of which is provided by industrial cooling water. The oxygen side / hydrogen side gas-water separator 220 further separates the cooled gas-water mixture, and the purified hydrogen and oxygen enter the subsequent system. The hydrogen side / oxygen side drainer is the collection point for the condensate separated by the hydrogen side / oxygen side gas-water separator, and transports the condensate to the hydrogen / oxygen separator for easy recycling.

[0026] The separation and condensate recovery process for hydrogen, oxygen, and condensate is as follows: alkali liquid carrying hydrogen and oxygen is transported from the corresponding hydrogen / oxygen outlets of the electrolyzer 100 to the hydrogen / oxygen separator. In the hydrogen / oxygen separator, hydrogen and oxygen are separated from the alkali liquid. The temperature of the initially separated hydrogen / oxygen is generally around 80°C. The gas temperature is then cooled to around 40°C by the hydrogen / oxygen gas cooler. The resulting coolant is then discharged into the corresponding hydrogen / oxygen separator. The gas enters the hydrogen / oxygen gas-water separator to further separate the water it carries, and the resulting hydrogen and oxygen enter the subsequent system. The condensate separated by the hydrogen / oxygen gas-water separator is gravity-fed through the hydrogen / oxygen drainage pipe into the hydrogen / oxygen drainer for buffering. The condensate in the hydrogen / oxygen drainer is gravity-fed through the hydrogen / oxygen drainage pipe to the hydrogen / oxygen separator for later recycling and reuse.

[0027] The system of the present invention buffers the condensate separated by the hydrogen-side / oxygen-side gas-water separator through the hydrogen-side / oxygen-side drainer and finally transports it to the hydrogen-oxygen separator, thereby realizing low-cost, high-efficiency, safe and pollution-free recovery and reuse of the condensate of the electrolytic hydrogen production device, and also realizing zero emission of the electrolytic hydrogen production device, greatly reducing the amount of sewage discharge, reducing the loss of raw material alkali liquid and the amount of alkali liquid replenishment in the subsequent electrolysis process, avoiding waste of water resources, and reducing the pollution to the environment and the threat to personnel safety caused by sewage discharge. While effectively recovering the raw material liquid (i.e., alkali liquid) and water vapor entrained by gas discharge in the electrolytic hydrogen production device through the above-mentioned system, it also overcomes the problem of increased water replenishment, alkali liquid replenishment and production cost caused by the failure to recover the condensate generated by the gas-water separator in the prior art, thereby realizing high utilization rate of water resources.

[0028] Preferably, the hydrogen-side gas-water separator 220 is installed at a position no lower than the hydrogen-side drain 230, which in turn is installed at a position no lower than the hydrogen separator 200. The oxygen-side gas-water separator 320 is installed at a position no lower than the oxygen-side drain 330, which in turn is installed at a position no lower than the oxygen separator 300. By installing the hydrogen-side / oxygen-side gas-water separator, the hydrogen-side / oxygen-side drain, and the hydrogen / oxygen separator in descending heights, the condensate separated in the hydrogen-side / oxygen-side gas-water separator can be more quickly returned to the hydrogen / oxygen separator through the hydrogen-side / oxygen-side drain under the action of gravity, thereby ensuring efficient and convenient condensate recovery.

[0029] like Figure 2Preferably, a hydrogen side drain valve 233 is provided on the hydrogen side drain pipe 231, and a hydrogen side drain valve 234 is provided on the hydrogen side liquid drain pipe 232; wherein, at most one of the hydrogen side drain valve 233 and the hydrogen side liquid drain valve 234 is in an open state; an oxygen side drain valve 333 is provided on the oxygen side drain pipe 331, and an oxygen side liquid drain valve 334 is provided on the oxygen side drain pipe 332; wherein, at most one of the oxygen side drain valve 333 and the oxygen side liquid drain valve 334 is in an open state.

[0030] The hydrogen side / oxygen side drain valve is used to control the on-off of the hydrogen side / oxygen side drain pipe, and the hydrogen side / oxygen side liquid discharge valve is used to control the on-off of the hydrogen side / oxygen side liquid discharge pipe to ensure effective control of the discharge of condensate. At most one of the hydrogen side / oxygen side drain valve and the hydrogen side / oxygen side liquid discharge valve is in the open state to prevent the gas in the hydrogen / oxygen separator from entering the hydrogen side / oxygen side gas-water separator, thereby ensuring the safe operation of the system. As for the design of the buffering and discharge cycle of the condensate in the hydrogen side / oxygen side drainer, it is selected by those skilled in the art based on the actual production situation on site. It can be a fixed time discharge cycle, or a gas production accumulation cycle, etc., which is not limited here. It should be noted that the hydrogen side / oxygen side drain valve and the hydrogen side / oxygen side liquid discharge valve can be pneumatic valves, or solenoid valves, etc., which are not limited to this.

[0031] Preferably, a hydrogen side balancing pipe 235 is arranged between the hydrogen side drainage pipe 231 located on the rear side of the hydrogen side drainage valve 233 and the hydrogen side liquid drainage pipe 232 located on the rear side of the hydrogen side liquid drainage valve 234; the installation position of the hydrogen side balancing pipe 235 is higher than the hydrogen side liquid drainage pipe 232; a hydrogen side balancing valve 236 is arranged on the hydrogen side balancing pipe 235; the hydrogen side balancing valve 236 and the hydrogen side liquid drainage valve 234 are maintained in the same opening and closing state.

[0032] Preferably, an oxygen side balancing pipe 335 is arranged between the oxygen side drainage pipe 331 located on the rear side of the oxygen side drainage valve 333 and the oxygen side liquid drainage pipe 332 located on the rear side of the oxygen side liquid drainage valve 334; the installation position of the oxygen side balancing pipe 335 is higher than the oxygen side liquid drainage pipe 332; an oxygen side balancing valve 336 is arranged on the oxygen side balancing pipe 335; the oxygen side balancing valve 336 and the oxygen side liquid drainage valve 334 are maintained in the same opening and closing state.

[0033] The pressure in the hydrogen / oxygen drain is relatively low. To facilitate smoother and faster drainage, the hydrogen / oxygen balancing valve and the hydrogen / oxygen drain valve are maintained at the same open / closed position. Opening the hydrogen / oxygen drain valve simultaneously with the hydrogen / oxygen balancing valve allows the hydrogen / oxygen balancing pipe to connect to the hydrogen / oxygen drain and the hydrogen / oxygen separator, balancing the pressure and accelerating the drainage rate. The hydrogen / oxygen balancing pipe is installed at a higher position than the hydrogen / oxygen drain pipe to facilitate gas-liquid countercurrent in the pipe, allowing the gas phase to continue upward through the hydrogen / oxygen balancing pipe and into the hydrogen / oxygen drain.

[0034] The provision of hydrogen / oxygen balancing pipes and valves ensures sufficient power for smooth liquid drainage, while eliminating the need for a transfer pump between the hydrogen / oxygen drainer and the hydrogen / oxygen separator, saving equipment and energy consumption, and also reducing production costs. Preferably, the hydrogen / oxygen balancing valves are gas one-way breathing valves, ensuring that the hydrogen / oxygen balancing pipes are used only for balancing gas pressure and do not flow liquid materials.

[0035] like Figure 3 Preferably, a first hydrogen side liquid level gauge 237 is provided in the hydrogen side gas-water separator 220, and a second hydrogen side liquid level gauge 238 is provided in the hydrogen side drainer 230; a first oxygen side liquid level gauge 337 is provided in the oxygen side gas-water separator 320, and a second oxygen side liquid level gauge 338 is provided in the oxygen side drainer 330; wherein, the liquid level height of the condensate in the hydrogen side drainer 230 and the oxygen side drainer 330 does not exceed 1 / 3 of the height of the hydrogen side drainer 230 and the oxygen side drainer 330.

[0036] The first hydrogen / oxygen side liquid level gauge and the second hydrogen / oxygen side liquid level gauge are both used to monitor the condensate level in the corresponding equipment in real time, facilitating the subsequent condensate discharge and the coordination of other valves, etc., and also facilitating the operator to adjust the condensate discharge time interval or discharge cycle according to the preset liquid level. For example, when the preset condensate level in the hydrogen / oxygen side gas-water separator is 1 / 3 of the hydrogen / oxygen side gas-water separator height, when the water level measured by the first hydrogen / oxygen side liquid level gauge reaches this preset height, the hydrogen / oxygen side drain valve needs to be opened to drain the water into the hydrogen / oxygen side drain; when the water level measured by the second hydrogen / oxygen side liquid level gauge reaches the preset height of the hydrogen / oxygen side drain, the hydrogen / oxygen side drain valve needs to be closed, and the hydrogen / oxygen side liquid drain valve needs to be opened to discharge the condensate into the hydrogen / oxygen separator, thereby realizing the recycling of the condensate in the hydrogen / oxygen side gas-water separator.

[0037] Preferably, the hydrogen side condensate recovery subsystem also includes a hydrogen side controller 239, which is electrically connected to the hydrogen side drain valve 233, the hydrogen side liquid drain valve 234, the hydrogen side balance valve 236, the hydrogen side first liquid level gauge 237, and the hydrogen side second liquid level gauge 238.

[0038] Preferably, the oxygen side condensate recovery subsystem also includes an oxygen side controller 339, which is electrically connected to the oxygen side drain valve 333, the oxygen side liquid drain valve 334, the oxygen side balance valve 336, the oxygen side first liquid level meter 337, and the oxygen side second liquid level meter 338.

[0039] Using hydrogen-side / oxygen-side controllers to interlock and control the valves and liquid level gauges on the corresponding side can reduce manual intervention and labor intensity, better control the valve opening sequence and timing based on the liquid level, and effectively prevent the simultaneous opening of the hydrogen-side / oxygen-side drain valve and the hydrogen-side / oxygen-side liquid discharge valve, thereby ensuring stable and safe operation of the system. It should be noted that hydrogen-side controller 239 and oxygen-side controller 339 can be two separate controllers, or the same controller can be used to achieve simultaneous control, both of which fall within the scope of protection of this patent.

[0040] When implementing the above-described condensate recovery system, both asynchronous hydrogen / oxygen side drainage and synchronous hydrogen / oxygen side drainage can be employed. Condensate can be discharged from the hydrogen and oxygen sides simultaneously or at intervals. Preferably, the valves on the hydrogen and oxygen sides operate synchronously. This synchronous drainage method ensures a stable liquid level in the system's hydrogen / oxygen separator, avoiding level fluctuations caused by asynchronous operation.

[0041] Preferably, a liquid blocker 240 is provided on the hydrogen-side drain pipe 231 between the hydrogen-side drain valve 233 and the hydrogen-side gas-water separator 220, and on the oxygen-side drain pipe 331 between the oxygen-side drain valve 333 and the oxygen-side gas-water separator 320. The liquid blocker 240 is a conventional technology and has a backflow prevention function. When the pressure in the hydrogen-side / oxygen-side gas-water separator drops rapidly during shutdown or emergency operation, the liquid blocker 240 is used to prevent the backflow of condensate in the hydrogen-side / oxygen-side drain, thereby ensuring the normal operation of the system.

[0042] The present invention will be further described in detail below with reference to specific embodiments.

[0043] Example 1

[0044] In this embodiment, the condensate recovery system of the electrolytic hydrogen production device is operated in an asynchronous manner, with the hydrogen side and the oxygen side draining in an unrelated order. Here, the hydrogen side is drained first as an example. The specific operation process is as follows:

[0045] Based on the reading from the first hydrogen-side liquid level gauge 237 in the hydrogen-side gas-water separator 220, the hydrogen-side controller 239 controls the opening of the hydrogen-side drain valve 233 every 20 seconds. This allows the condensate to be drained into the hydrogen-side drain 230 by gravity and pressure differential. After 1800 seconds, when the liquid level in the hydrogen-side drain 230 reaches one-third of the level as measured by the second hydrogen-side liquid level gauge 238, the hydrogen-side controller 239 controls the closing of the hydrogen-side drain valve 233 and simultaneously opens the hydrogen-side liquid drain valve 234 and the hydrogen-side balancing valve 236. This balances the pressure in the hydrogen-side drain 230 with the pressure in the hydrogen separator 200, allowing the condensate to be drained from the hydrogen-side drain 230 into the hydrogen separator 200. After the hydrogen-side liquid drain valve 234 and the hydrogen-side balancing valve 236 are opened for 20 seconds, draining is complete. The hydrogen-side liquid drain valve 234 and the hydrogen-side balancing valve 236 are then closed, and the hydrogen-side drain valve 233 is opened, repeating the cycle.

[0046] After one round of hydrogen-side condensate discharge, the same operation is performed to discharge the condensate in the oxygen-side gas-water separator 320. Specifically, based on the detection value of the first oxygen-side liquid level gauge 337 in the oxygen-side gas-water separator 320, the oxygen-side controller 339 controls the opening of the oxygen-side drain valve 333 every 20 seconds. The condensate is discharged into the oxygen-side drain 330 by gravity and pressure differential. After 1800 seconds, when the liquid level in the oxygen-side drain 330 reaches 1 / 3 as detected by the second oxygen-side liquid level gauge 338, the oxygen-side controller 339 controls the closing of the oxygen-side drain valve 333 and simultaneously opens the oxygen-side drain valve 334 and the oxygen-side balancing valve 336. This balances the pressure in the oxygen-side drain 330 with the pressure in the oxygen separator 300, allowing the condensate to be smoothly discharged from the oxygen-side drain 330 into the oxygen separator 300. After the oxygen side drain valve 334 and the oxygen side balance valve 336 are opened for 20 seconds, the draining is completed, the oxygen side drain valve 334 and the oxygen side balance valve 336 are closed, the oxygen side drain valve 333 is opened, and the above cycle is repeated.

[0047] It should be noted that the drainage time in this embodiment is designed according to the volume of the hydrogen side / oxygen side drainer, which is only for illustration and not for limitation of the present invention.

[0048] Example 2

[0049] In this embodiment, the condensate recovery system of the electrolytic hydrogen production device is operated by discharging liquid synchronously on the hydrogen side and the oxygen side. The specific operation process is as follows:

[0050] Based on the readings from the first hydrogen / oxygen level gauge in the hydrogen / oxygen gas-water separator, the hydrogen / oxygen controller controls the opening of the hydrogen / oxygen drain valve every 20 seconds. This allows the condensate to drain into the hydrogen / oxygen drain via gravity and pressure differential. After 1800 seconds, when the liquid level in the hydrogen / oxygen drain reaches 1 / 3 of its original height as measured by the second hydrogen / oxygen level gauge, the hydrogen / oxygen controller closes the hydrogen / oxygen drain valve and simultaneously opens the hydrogen / oxygen drain valve and the hydrogen / oxygen balance valve. This balances the pressure in the hydrogen / oxygen drain and the hydrogen / oxygen separator, allowing the condensate to drain smoothly from the hydrogen / oxygen drain into the hydrogen / oxygen separator. After the hydrogen / oxygen drain valve and balance valve remain open for 20 seconds, draining is complete. The hydrogen / oxygen drain valve and balance valve are then closed, and the hydrogen / oxygen drain valve is opened, repeating the cycle.

[0051] Example 3

[0052] Based on the above embodiment, in this embodiment, the hydrogen and oxygen sides are drained synchronously. A hydrogen / oxygen side controller controls the hydrogen / oxygen side drain valve to be normally open. Condensate in the hydrogen / oxygen side gas-water separator flows directly into the hydrogen / oxygen side drain during operation. When the liquid level in the hydrogen / oxygen side drain reaches 1 / 3 as detected by a second hydrogen / oxygen side level gauge, the hydrogen / oxygen side controller controls the hydrogen / oxygen side drain valve to close and simultaneously opens the hydrogen / oxygen side drain valve and the hydrogen / oxygen side balance valve. The draining time is generally no less than one minute. After draining is complete, the hydrogen / oxygen side drain valve and the hydrogen / oxygen side balance valve are closed, the hydrogen / oxygen side drain valve is opened, and the cycle is repeated.

[0053] Compared with the operation of the above-mentioned Examples 1 to 3, preferably, the valves on the hydrogen side and the oxygen side are operated synchronously. This synchronous liquid discharge method can ensure the stability of the liquid level in the system hydrogen / oxygen separator and avoid liquid level fluctuations caused by asynchronous operation.

[0054] It should be noted that the detailed structures of some devices are not described in detail in this utility model, but they belong to the prior art known to those skilled in the art, so they will not be described here. In addition, the parts not mentioned in this system are the same as the prior art or can be implemented using the prior art.

[0055] It should be noted that those skilled in the art, guided by the present invention, may also make some modifications to the above-mentioned system. For example, the equipment within the system may be equipped with a liquid level gauge, overflow / nitrogen pipeline, etc.; the internal delivery pipelines within the system may be equipped with pumps, pressure sensors, flow meters, or temperature sensors between different units, devices, and equipment; various valves may also be installed, such as pressure relief valves, pressure regulating valves, safety valves, and pneumatic valves, for regulating and stabilizing the pressure of the entire system. The valve opening may also be adjusted to regulate the flow of materials within the pipeline.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A condensate recovery system for an electrolytic hydrogen production device, characterized in that: include: Hydrogen side condensate recovery subsystem and oxygen side condensate recovery subsystem; The hydrogen side condensate recovery subsystem includes a hydrogen side drainer, a hydrogen side drain pipe, and a hydrogen side drainage pipe; the inlet of the hydrogen side drainer is connected to the liquid phase outlet of the hydrogen side gas-water separator through the hydrogen side drain pipe, the gas phase outlet of the hydrogen side gas-water separator is connected to the hydrogen pipe, the inlet of the hydrogen side gas-water separator is connected to the gas phase outlet of the hydrogen side gas cooler, and the liquid phase outlet of the hydrogen side gas cooler is connected to the coolant inlet of the hydrogen separator through the cooler reflux pipe; the outlet of the hydrogen side drainer is connected to the condensate inlet of the hydrogen separator through the hydrogen side drainage pipe; The oxygen side condensate recovery subsystem includes an oxygen side drainer, an oxygen side drainage pipe, and an oxygen side drainage pipe; the inlet of the oxygen side drainer is connected to the liquid phase outlet of the oxygen side gas-water separator through the oxygen side drainage pipe, the gas phase outlet of the oxygen side gas-water separator is connected to the oxygen pipe, the inlet of the oxygen side gas-water separator is connected to the gas phase outlet of the oxygen side gas cooler, and the liquid phase outlet of the oxygen side gas cooler is connected to the coolant inlet of the oxygen separator through the cooler reflux pipe; the outlet of the oxygen side drainer is connected to the condensate inlet of the oxygen separator through the oxygen side drainage pipe.

2. The condensate recovery system of the electrolytic hydrogen production device according to claim 1, characterized in that: The installation position of the hydrogen side gas-water separator is not lower than the hydrogen side drainer, and the installation position of the hydrogen side drainer is not lower than the hydrogen separator; the installation position of the oxygen side gas-water separator is not lower than the oxygen side drainer, and the installation position of the oxygen side drainer is not lower than the oxygen separator.

3. The condensate recovery system of the electrolytic hydrogen production device according to claim 1, characterized in that: The hydrogen side drainage pipe is provided with a hydrogen side drainage valve, and the hydrogen side liquid drainage pipe is provided with a hydrogen side liquid drainage valve; wherein at most one of the hydrogen side drainage valve and the hydrogen side liquid drainage valve is in an open state; The oxygen side drainage pipe is provided with an oxygen side drainage valve, and the oxygen side liquid drainage pipe is provided with an oxygen side liquid drainage valve; wherein, at most one of the oxygen side drainage valve and the oxygen side liquid drainage valve is in an open state.

4. The condensate recovery system of the electrolytic hydrogen production device according to claim 3, characterized in that: A hydrogen side balancing pipe is provided between the hydrogen side drainage pipe located at the rear side of the hydrogen side drainage valve and the hydrogen side liquid drainage pipe located at the rear side of the hydrogen side liquid drainage valve; the installation position of the hydrogen side balancing pipe is higher than the hydrogen side liquid drainage pipe; The hydrogen side balancing pipeline is provided with a hydrogen side balancing valve; the hydrogen side balancing valve and the hydrogen side drain valve are kept in the same opening and closing state.

5. The condensate recovery system of the electrolytic hydrogen production device according to claim 4, characterized in that: An oxygen side balancing pipe is provided between the oxygen side drainage pipe located at the rear side of the oxygen side drainage valve and the oxygen side liquid drainage pipe located at the rear side of the oxygen side liquid drainage valve; the installation position of the oxygen side balancing pipe is higher than the oxygen side liquid drainage pipe; An oxygen side balancing valve is provided on the oxygen side balancing pipeline; the oxygen side balancing valve and the oxygen side drain valve are kept in the same opening and closing state.

6. The condensate recovery system of the electrolytic hydrogen production device according to claim 5, characterized in that: The hydrogen side gas-water separator is provided with a first hydrogen side liquid level gauge, and the hydrogen side drainer is provided with a second hydrogen side liquid level gauge; the oxygen side gas-water separator is provided with a first oxygen side liquid level gauge, and the oxygen side drainer is provided with a second oxygen side liquid level gauge; wherein the liquid level height of the condensate in the hydrogen side drainer and the oxygen side drainer does not exceed 1 / 3 of the height of the hydrogen side drainer and the oxygen side drainer.

7. The condensate recovery system of the electrolytic hydrogen production device according to claim 6, characterized in that: The hydrogen side condensate recovery subsystem also includes a hydrogen side controller, which is electrically connected to the hydrogen side drain valve, the hydrogen side liquid drain valve, the hydrogen side balancing valve, the hydrogen side first liquid level gauge, and the hydrogen side second liquid level gauge.

8. The condensate recovery system of the electrolytic hydrogen production device according to claim 6, characterized in that: The oxygen side condensate recovery subsystem also includes an oxygen side controller, which is electrically connected to the oxygen side drain valve, the oxygen side liquid drain valve, the oxygen side balance valve, the oxygen side first liquid level gauge, and the oxygen side second liquid level gauge.

9. The condensate recovery system of the electrolytic hydrogen production device according to claim 3, characterized in that: Liquid blockers are respectively provided on the hydrogen side drainage pipeline between the hydrogen side drainage valve and the hydrogen side gas-water separator, and on the oxygen side drainage pipeline between the oxygen side drainage valve and the oxygen side gas-water separator.

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