Gas-liquid separation device of water electrolysis hydrogen production system

Abstract

The utility model relates to the technical field of hydrogen production, and discloses a gas-liquid separation device of a water electrolysis hydrogen production system, which comprises a hydrogen-water-gas-liquid separator, a hydrogen condensation separator, an oxygen condensation separator and an oxygen-water-gas-liquid separator which are communicated in sequence, and the hydrogen-water-gas-liquid separator is communicated with the oxygen-water-gas-liquid separator. The utility model solves the problems of low separation efficiency, large occupied area of separation facilities and the like in the prior art.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrogen production, in particular to a gas-liquid separation device of a water electrolysis hydrogen production system. Background Art

[0002] Hydrogen production by water electrolysis is an important way of green hydrogen production. Among them, proton exchange membrane (PEM) water electrolysis hydrogen production has the advantages of high system conversion efficiency, fast response speed, and adaptability to the volatility of renewable energy power generation, and has gradually become a mature industry. Since hydrogen and oxygen produced by PEM water electrolysis contain a small amount of water, gravity separation, condensation dehydration, absorption and adsorption dehydration and other methods are required to remove the water in hydrogen and oxygen to obtain pure hydrogen and pure oxygen products. However, the gas-liquid separation scheme currently adopted has the following problems:

[0003] (1) The gas-liquid separation device is configured as a two-stage gas-liquid separator and a primary condenser. The separation facility occupies a large area, the pipeline layout is complex, and the separation efficiency is low;

[0004] (2) The temperature of pure water discharged from the primary gas-liquid separator does not meet the requirements for returning to the electrolytic cell. Usually, a heat exchanger needs to be set up to cool it to the pure water inlet temperature of the electrolytic cell. In addition, measures need to be taken to add additional water before the pure water is discharged from the gas-liquid separator to ensure that the container is in a liquid-sealed state.

[0005] (3) After the gas-liquid mixture is condensed in the first condenser of the gas-liquid separation device, the condensed water is discharged to the second gas-liquid separator together with the gas, which not only reduces the gas-liquid separation efficiency, but also the condensed water cannot be effectively recycled.

[0006] In the process of PEM water electrolysis to produce hydrogen, the electrolyzed hydrogen and oxygen contain a lot of water, and a separation and purification process is required to obtain pure hydrogen and oxygen products. However, the current separation process not only has low separation efficiency, but also the separation facilities occupy a large area. It is difficult to recover the condensed pure water of the gas-liquid mixture in the condenser. In addition, since the pure water discharged from the primary gas-liquid separator cannot be replenished, the pure water temperature cannot meet the needs of the electrolyzer. It is necessary to add an additional water replenishment device to maintain the water storage level of the primary gas-liquid separator, and set a heat exchange device to keep the water temperature of the return electrolyzer constant. Utility Model Content

[0007] In order to overcome the deficiencies of the prior art, the utility model provides a gas-liquid separation device for a water electrolysis hydrogen production system, which solves the problems of low separation efficiency and large footprint of separation facilities in the prior art.

[0008] The technical solution adopted by the utility model to solve the above problems is:

[0009] A gas-liquid separation device of a water electrolysis hydrogen production system comprises a hydrogen-water gas-liquid separator, a hydrogen condensation separator, an oxygen condensation separator, and an oxygen-water gas-liquid separator which are connected in sequence, and the hydrogen-water gas-liquid separator is connected to the oxygen-water gas-liquid separator.

[0010] As a preferred technical solution, the hydrogen-water gas-liquid separator is provided with a hydrogen-water mixture inlet, a hydrogen-water gas-liquid separator pure water outlet, a hydrogen outlet of the hydrogen-water gas-liquid separator, and a condensed water return inlet of the hydrogen-water gas-liquid separator;

[0011] The oxygen-water gas-liquid separator is provided with an oxygen-water mixture inlet, an oxygen-water gas-liquid separator pure water outlet, an oxygen outlet of the oxygen-water gas-liquid separator oxygen, and an oxygen-water gas-liquid separator condensation return water inlet;

[0012] The hydrogen condensation separator is provided with a hydrogen inlet for the hydrogen condensation separator, a condensation return water outlet for the hydrogen condensation separator, a hydrogen outlet for the hydrogen condensation separator, a cold water outlet for the hydrogen condensation separator, and a cold water inlet for the hydrogen condensation separator;

[0013] The oxygen condensation separator is provided with an oxygen inlet for the oxygen condensation separator, a condensation return water outlet for the oxygen condensation separator, an oxygen outlet for the oxygen-water condensation separator, a cold water outlet for the oxygen condensation separator, and a cold water inlet for the oxygen condensation separator;

[0014] The condensation return water inlet of the hydrogen-water gas-liquid separator is connected to the condensation return water outlet of the hydrogen condensation separator, and the hydrogen outlet of the hydrogen-water gas-liquid separator is connected to the hydrogen inlet of the hydrogen condensation separator;

[0015] The cold water outlet of the hydrogen condensation separator is connected to the cold water outlet of the oxygen condensation separator, and the cold water inlet of the hydrogen condensation separator is connected to the cold water inlet of the oxygen condensation separator;

[0016] The oxygen outlet of the oxygen-water gas-liquid separator is communicated with the oxygen inlet of the oxygen condensation separator, and the condensation return water inlet of the oxygen-water gas-liquid separator is communicated with the condensation return water outlet of the oxygen condensation separator;

[0017] The pure water outlet of the hydrogen-water gas-liquid separator is communicated with the pure water outlet of the oxygen-water gas-liquid separator.

[0018] As a preferred technical solution, the hydrogen-water mixture inlet is arranged at the upper part of the hydrogen-water gas-liquid separator, and the pure water outlet of the hydrogen-water gas-liquid separator is arranged at the lower part of the hydrogen-water gas-liquid separator; the oxygen-water mixture inlet is arranged at the upper part of the oxygen-water gas-liquid separator, and the pure water outlet of the oxygen-water gas-liquid separator is arranged at the lower part of the oxygen-water gas-liquid separator.

[0019] As a preferred technical solution, the inner wall of the hydrogen-water mixture inlet is provided with a hydrogen-water mixture inlet baffle and a hydrogen-water flow baffle, and the inner wall of the oxygen-water mixture inlet is provided with an oxygen-water mixture inlet baffle and an oxygen-water flow baffle.

[0020] As a preferred technical solution, the hydrogen inlet of the hydrogen condensation separator is located at the lower part of the hydrogen condensation separator, the condensed water return outlet of the hydrogen condensation separator is located at the lower part of the hydrogen condensation separator, and the hydrogen outlet of the hydrogen condensation separator is located at the upper part of the hydrogen condensation separator;

[0021] The oxygen inlet of the oxygen condensation separator is located at the lower part of the oxygen condensation separator, the condensation return water outlet of the oxygen condensation separator is located at the lower part of the oxygen condensation separator, and the oxygen outlet of the oxygen-water condensation separator is located at the upper part of the oxygen condensation separator.

[0022] As a preferred technical solution, a hydrogen condensation separator cold water inlet valve is provided on the pipe of the hydrogen condensation separator cold water inlet, and a hydrogen condensation separator condensation return water outlet valve is provided on the pipe of the hydrogen condensation separator condensation return water outlet; an oxygen condensation separator cold water inlet valve is provided on the pipe of the oxygen condensation separator cold water inlet, and an oxygen condensation separator condensation return water outlet valve is provided on the pipe of the oxygen-water gas-liquid separator condensation return water inlet.

[0023] As a preferred technical solution, a hydrogen-water gas-liquid separator is provided with a hydrogen-water gas-liquid separator liquid level meter, and an oxygen-water gas-liquid separator is provided with an oxygen-water gas-liquid separator liquid level meter.

[0024] As a preferred technical solution, the hydrogen-water gas-liquid separator is provided with a hydrogen-water gas-liquid separator thermometer, and the oxygen-water gas-liquid separator is provided with an oxygen-water gas-liquid separator thermometer; the hydrogen condensation separator is provided with a hydrogen condensation separator thermometer, and the oxygen condensation separator is provided with an oxygen condensation separator thermometer.

[0025] As a preferred technical solution, the hydrogen outlet of the hydrogen-water gas-liquid separator is connected to a hydrogen outlet wire mesh mist collector, and the oxygen outlet of the oxygen-water gas-liquid separator is connected to an oxygen outlet wire mesh mist collector.

[0026] As a preferred technical solution, a hydrogen condensation separator is provided in the hydrogen condensation separator, and an oxygen condensation separator is provided in the oxygen condensation separator.

[0027] Compared with the prior art, the utility model has the following beneficial effects:

[0028] (1) The gas condensation separator is fixed on the top of the gas-liquid separator through the equipment support, and a condensation return water port and a gas pipe port are set to directly connect the condensation separator and the gas-liquid separator, thereby ensuring the compact layout of the equipment, reducing the number of connecting pipes between the equipment that are bent, and saving space. The straight-through butt joint port set between the equipment ensures that the liquid phase fluid flows freely in the condensation return water port connected to the equipment and the gas phase fluid flows freely in the gas pipe port connected to the equipment. The fluid is secondary separated between the equipment by gravity. The water storage baffle set on the inner wall of the condensation return water inlet of the gas-liquid separator liquid-seals the internal gas phase space of the gas-liquid separator to ensure that the gas does not flow into the condensation return water inlet;

[0029] (2) The interior of the gas condensation separator is divided into three parts, wherein the upper layer is set as a cavity (occupying 1 / 2 of the tank volume), which can not only realize the condensation and dehydration of the gas-liquid mixture in the gas condensation separator, but also obtain a good gas-liquid gravity separation effect; the middle layer is set as a gas heat exchange device (occupying 1 / 4 of the tank volume); the lower layer is set as a cavity (occupying 1 / 4 of the tank volume) as a water storage function; the mixed gas entering the gas condensation separator is effectively separated from the condensed water contained in the gas under the dual separation effects of condensation separation and gravity separation of the gas condensation separator, and returns to the gas-liquid separator for storage through the condensation return port, and finally flows out through the liquid outlet of the gas-liquid separator, realizing efficient recovery of liquid in the electrolyzed water product gas;

[0030] (3) Automatic regulating valves are provided on the cold water inlet pipes of the hydrogen condensation separator and the oxygen condensation separator. The valve opening is adjusted according to the bottom liquid storage temperature of the gas condensation separator to ensure that the cold water flow meets the requirements of the condensed gas; automatic regulating valves are provided on the condensation return water pipes of the hydrogen condensation separator and the oxygen condensation separator. The valve opening is adjusted according to the bottom liquid storage temperature of the hydrogen-water gas-liquid separator and the oxygen-water gas-liquid separator to ensure that the bottom water storage temperature of the hydrogen-water gas-liquid separator and the oxygen-water gas-liquid separator meets the temperature requirements of the return electrolyzer, thereby reducing the need for heat exchange devices to maintain the return water temperature of the electrolyzer and saving equipment costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the structure of the utility model;

[0032] Figure 2 for Figure 1 One of the partial enlarged pictures;

[0033] Figure 3 for Figure 1 The second partial enlarged picture;

[0034] Figure 4 This is the implementation process and operating parameter diagram of PEM water electrolysis hydrogen production.

[0035] The symbols and their corresponding names in the attached drawings are: 1. Hydrogen-water mixture inlet, 2. Hydrogen-water gas-liquid separator condensation return water inlet, 3. Hydrogen-water gas-liquid separator hydrogen outlet, 4. Hydrogen-water gas-liquid separator pure water outlet, 5. Hydrogen-water gas-liquid separator liquid level gauge, 6. Container support, 7. Hydrogen-water mixture inlet baffle, 8. Hydrogen-water flow baffle, 9. Hydrogen-water gas-liquid separator water storage baffle, 10. Hydrogen outlet wire mesh mist collector, 11. Hydrogen-water gas-liquid separator thermometer, 12. Hydrogen Gas-water gas-liquid separator pure water outlet valve, 13, hydrogen condensation separator hydrogen outlet, 14, hydrogen condensation separator condensate return water outlet, 15, hydrogen condensation separator hydrogen inlet, 16, hydrogen condensation separator cold water outlet, 17, hydrogen condensation separator cold water inlet, 18, hydrogen condensation separator heat exchange device, 19, hydrogen condensation separator thermometer, 20, hydrogen condensation separator condensate return water outlet valve, 21, hydrogen condensation separator cold water inlet valve, 22, oxygen-water mixture inlet, 23, oxygen - Water gas-liquid separator condensation return water inlet, 24, oxygen-water gas-liquid separator oxygen outlet, 25, oxygen-water gas-liquid separator pure water outlet, 26, oxygen-water gas-liquid separator liquid level gauge, 27, oxygen-water mixture inlet baffle, 28, oxygen-water flow baffle, 29, oxygen-water gas-liquid separator water storage baffle, 30, oxygen outlet wire mesh mist collector, 31, oxygen-water gas-liquid separator thermometer, 32, oxygen-water gas-liquid separator pure water outlet valve, 33, oxygen-water condensation separator oxygen outlet, 34. Condensate return water outlet of oxygen condensation separator, 35. Oxygen inlet of oxygen condensation separator, 36. Cold water outlet of oxygen condensation separator, 37. Cold water inlet of oxygen condensation separator, 38. Heat exchange device of oxygen condensation separator, 39. Thermometer of oxygen condensation separator, 40. Condensate return water outlet valve of oxygen condensation separator, 41. Cold water inlet valve of oxygen condensation separator, 51. Hydrogen-water gas-liquid separator, 52. Hydrogen condensation separator, 53. Oxygen-water gas-liquid separator, 54. Oxygen condensation separator. DETAILED DESCRIPTION

[0036] The present invention will be further described in detail below in conjunction with the embodiments and drawings, but the implementation manner of the present invention is not limited thereto.

[0037] Example 1

[0038] like Figures 1 to 4 As shown, in response to the problems of the prior art, the utility model provides a gas-liquid separation device for a water electrolysis hydrogen production system, which is configured as a single-stage gas-liquid separator and a single-stage condensation separator. While effectively improving the gas-liquid separation efficiency and reducing the space occupied by the gas-liquid separation device, it can also recycle the gas-liquid in the condenser to replenish water for the gas-liquid separator and output it to the electrolyzer at a suitable water temperature.

[0039] The utility model aims to provide an efficient gas-liquid separation system for a PEM hydrogen production device, which can deeply separate the oxygen-water and hydrogen-water two-phase mixtures produced by the PEM electrolyzer, and recycle the pure water separated from the two-phase mixture to replenish the gas-liquid separator, and utilize the condensation separator to ensure that the pure water temperature meets the water temperature requirement of the return electrolyzer, and at the same time obtain low dew point product hydrogen and oxygen, and has the characteristics of high separation efficiency, small footprint, and direct recycling of pure water.

[0040] A gas-liquid separation device for a water electrolysis hydrogen production system comprises a hydrogen-water gas-liquid separator 51, a hydrogen condensation separator 52, an oxygen-water gas-liquid separator 53, an oxygen condensation separator 54, and pipelines, instruments, and valves connecting the above devices.

[0041] The hydrogen-water gas-liquid separator 51 is provided with a hydrogen-water mixture inlet 1, a hydrogen-water gas-liquid separator pure water outlet 4, a hydrogen outlet 3 for the hydrogen-water gas-liquid separator, and a hydrogen-water gas-liquid separator condensed water return inlet 2, wherein the hydrogen-water mixture inlet 1 is provided at the upper part of the hydrogen-water gas-liquid separator 51, and a hydrogen-water mixture inlet baffle 7 is provided on the inner wall surface of the hydrogen-water mixture inlet 1, and the hydrogen-water gas-liquid separator pure water outlet 4 is provided at the lower middle position of the hydrogen-water gas-liquid separator 51;

[0042] The oxygen-water gas-liquid separator 53 is provided with an oxygen-water mixture inlet 22, an oxygen-water gas-liquid separator pure water outlet 25, an oxygen-water gas-liquid separator oxygen outlet 24, and an oxygen-water gas-liquid separator condensed water return inlet 23, wherein the oxygen-water mixture inlet 22 is provided at the upper part of the oxygen-water gas-liquid separator 53, and an oxygen-water mixture inlet baffle 27 is provided on the inner wall surface of the oxygen-water mixture inlet 22, and the oxygen-water gas-liquid separator pure water outlet 25 is provided at the lower middle position of the oxygen-water gas-liquid separator 53;

[0043] The outlet pipeline is provided with an automatic control valve, which is interlocked with the liquid level gauge switch provided on the hydrogen-water gas-liquid separator and the oxygen-water gas-liquid separator; the gas outlet is provided at the upper part of the hydrogen-water gas-liquid separator and the oxygen-water gas-liquid separator, away from the position of the gas-liquid mixture inlet, and a wire mesh demister (hydrogen outlet wire mesh mist collector 10, oxygen outlet wire mesh mist collector 30) is further provided at the gas outlet, which is located at the gas outlet of the hydrogen-water gas-liquid separator and the oxygen-water gas-liquid separator; the condensation return water inlet is provided at the hydrogen The upper part of the hydrogen-water gas-liquid separator and the oxygen-water gas-liquid separator is directly connected to the corresponding condensation return water outlet of the hydrogen condensation separator and the oxygen condensation separator. In addition, a water storage baffle (hydrogen-water gas-liquid separator water storage baffle 9, oxygen-water gas-liquid separator water storage baffle 29) and a flow baffle (hydrogen-water flow baffle 8, oxygen-water flow baffle 28) are arranged in the hydrogen-water gas-liquid separator and the oxygen-water gas-liquid separator, and are located on the inner wall of the condensation return water inlet of the hydrogen-water gas-liquid separator and the oxygen-water gas-liquid separator. The hydrogen-water gas-liquid separator and the oxygen-water gas-liquid separator are provided with a liquid level gauge (hydrogen-water gas-liquid separator liquid level gauge 5, oxygen-water gas-liquid separator liquid level gauge 26) and a thermometer (hydrogen-water gas-liquid separator thermometer 11, oxygen-water gas-liquid separator thermometer 31), and the thermometer is inserted below the liquid level of the container.

[0044] The hydrogen condensation separator 52 is provided with a hydrogen condensation separator hydrogen inlet 15, a hydrogen condensation separator condensate return water outlet 14, a hydrogen condensation separator hydrogen outlet 13, a hydrogen condensation separator hydrogen inlet 15, and a hydrogen condensation separator cold water outlet 16, wherein the hydrogen condensation separator hydrogen inlet 15 is located at the lower part of the hydrogen condensation separator 52 and corresponds to the hydrogen condensation separator hydrogen outlet 13 of the hydrogen condensation separator 52; the hydrogen condensation separator condensate return water outlet 14 is located at the lower part of the hydrogen condensation separator 52 and corresponds to the hydrogen-water gas-liquid separator 5 1, an automatic regulating valve (hydrogen condensation separator condensation return water outlet valve 20) and a thermometer interlocking switch of the hydrogen condensation separator 52 are arranged on the condensation return water outlet pipeline; the hydrogen outlet 13 of the hydrogen condensation separator is located at the upper part of the hydrogen condensation separator 52, close to the head position; the cold water inlet 17 of the hydrogen condensation separator is located at the lower half of the head, and an automatic regulating valve (hydrogen condensation separator cold water inlet valve 21) is arranged on the cold water inlet pipeline to adjust the cold water flow; the cold water outlet 16 of the hydrogen condensation separator is located at the upper half of the head;

[0045] The oxygen condensation separator 54 is provided with an oxygen condensation separator oxygen inlet 35, an oxygen condensation separator condensation return water outlet 34, an oxygen-water condensation separator oxygen outlet 33, an oxygen condensation separator cold water inlet 37, and an oxygen condensation separator cold water outlet 36, wherein the oxygen condensation separator oxygen inlet 35 is located at the lower part of the oxygen condensation separator 54 and corresponds to the oxygen-water condensation separator oxygen outlet 33 on the oxygen condensation separator 54; the oxygen condensation separator condensation return water outlet 34 is located at the lower part of the oxygen condensation separator 54 and corresponds to the oxygen-water gas-liquid separator. 53, an automatic regulating valve (oxygen condensation separator condensation return water outlet valve 40) and a thermometer interlocking switch of the oxygen condensation separator 54 are arranged on the condensation return water outlet pipeline; the oxygen outlet 33 of the oxygen-water condensation separator is located at the upper part of the oxygen condensation separator 54, close to the end cap position; the cold water inlet 37 of the oxygen condensation separator is located at the lower half of the end cap, and an automatic regulating valve (oxygen condensation separator cold water inlet valve 41) is arranged on the cold water inlet pipeline to adjust the cold water flow; the cold water outlet 36 of the oxygen condensation separator is located at the upper half of the end cap;

[0046] Gas heat exchange devices (hydrogen condensation separator heat exchange device 18, oxygen condensation separator heat exchange device 38) are arranged in the cavities of the hydrogen condensation separator and the oxygen condensation separator for gas condensation heat exchange. The hydrogen condensation separator and the oxygen condensation separator have two other cavities, one of which is located above the heat exchange device to increase the gas-liquid separation time and enhance the gas-liquid separation effect, and the other is located below the heat exchange device for liquid storage; the hydrogen condensation separator and the oxygen condensation separator are also provided with thermometers (hydrogen condensation separator thermometer 19, oxygen condensation separator thermometer 39) inserted below the liquid level of the container; the hydrogen condensation separator and the oxygen condensation separator are arranged on the top of the hydrogen and oxygen gas-liquid separators, respectively, and are fixed on the hydrogen gas-liquid separator and the oxygen gas-liquid separator through equipment support, and the condensation return water inlet is connected to ensure that the condensed and separated liquid flows smoothly back to the gas-liquid separator from the condensation return water inlet of the gas cooling separator, so as to realize the recovery of liquid carried in the gas.

[0047] Example 2

[0048] like Figures 1 to 4 As shown, as a further optimization of Example 1, based on Example 1, this embodiment also includes the following technical features:

[0049] Figure 4 The patent shows a gas-liquid separation device for a water electrolysis hydrogen production system, and the working process is as follows:

[0050] The hydrogen-water mixture produced by PEM water electrolysis enters the hydrogen-water gas-liquid separator from the gas-liquid mixture inlet. After gravity separation in the separator, the gas phase enters the hydrogen-water condensation separator through the hydrogen outlet, and the liquid phase remains at the bottom of the gas-liquid separator.

[0051] After the gas phase enters the hydrogen-water condensation separator, it is heat exchanged and condensed and separated in the gas heat exchange device in the lower part, and is gravity-separated for the second time in the upper part of the hydrogen-water condensation separator. The hydrogen after condensation and gravity separation is discharged from the hydrogen outlet of the hydrogen-water condensation separator to the product area, and the pure water enters the liquid phase space of the hydrogen-water gas-liquid separator through the condensation return water outlet. The automatic regulating valve of the cold water inlet pipeline of the hydrogen condensation separator is interlocked with the condensation water temperature in the hydrogen condensation separator. The temperature of the pure water in the hydrogen condensation separator is controlled by adjusting the cold water flow. The pure water outlet valve of the hydrogen-water gas-liquid separator is interlocked with the liquid level switch. When the liquid level is high, the pure water is discharged and recycled. The opening of the automatic valve of the condensation return water outlet 14 of the hydrogen condensation separator is controlled by the bottom liquid temperature in the hydrogen-water gas-liquid separator to keep the return water temperature of the electrolyzer discharged from the hydrogen-water gas-liquid separator constant and meet the temperature requirements.

[0052] Similarly, the oxygen-water mixture produced by PEM water electrolysis to produce hydrogen enters the oxygen-water gas-liquid separator from the gas-liquid mixture inlet. After gravity separation in the separator, the gas phase enters the oxygen-water condensation separator through the oxygen outlet, and the liquid phase remains at the bottom of the gas-liquid separator.

[0053] After the gas phase enters the oxygen-water condensation separator, it is heat exchanged and condensed in the gas heat exchange device in the lower part, and is gravity-separated for the second time in the upper part of the oxygen-water condensation separator. The oxygen after condensation and gravity separation is discharged from the oxygen outlet of the oxygen-water condensation separator to the product area, and the pure water enters the liquid phase space of the oxygen-water gas-liquid separator through the condensation return water outlet. The automatic regulating valve of the cold water inlet pipeline of the oxygen condensation separator is interlocked with the condensation water temperature in the oxygen condensation separator, and the pure water temperature in the oxygen condensation separator is controlled by adjusting the cold water flow. The pure water outlet valve of the oxygen-water gas-liquid separator directly discharges the pure water for recycling. The opening of the automatic valve of the condensation return water outlet 34 of the oxygen condensation separator is controlled by the bottom liquid temperature in the hydrogen-water gas-liquid separator to keep the water temperature of the return electrolyzer discharged from the oxygen-water gas-liquid separator constant and meet the temperature requirements.

[0054] Implementation measures:

[0055] (1) Design: The gas-liquid separator is provided with a gas-liquid mixture inlet, a pure water outlet, a gas outlet, and a condensate return water inlet. The gas-liquid separator is provided with a gas-liquid mixture inlet baffle, a gas-liquid mixture flow baffle and a gas outlet wire mesh mist collector. The condensate separator is provided with a gas inlet, a condensate return water outlet, a gas outlet, a cold water inlet and a cold water outlet. The interior of the condensate separator is provided with three parts, the upper layer (occupying 1 / 2 of the tank volume) is a cavity, the middle layer (occupying 1 / 4 of the tank volume) is provided with a heat exchange device, and the lower layer (occupying 1 / 4 of the tank volume) is a cavity, wherein the condensate return water inlet and the gas outlet of the gas-liquid separator are directly connected to the condensate return water outlet and the gas inlet of the condensate separator respectively, and the condensate separator is fixed to the upper part of the gas-liquid separator by the equipment support.

[0056] (2) Operation: Take the PEM water electrolysis hydrogen production system with a rated power of 1000kW as an example. Figure 3 The parameters of the gas-liquid separation device shown are as follows: the hydrogen and oxygen after electrolysis in the electrolytic cell enter the gas-liquid separator and condensation separator for one condensation and two gravity separations to obtain high-purity hydrogen and oxygen products, and recover pure water that meets the temperature requirements for entering the electrolytic cell.

[0057] In the utility model, a design in which a gas-liquid separator is directly connected to a condensation separator includes but is not limited to direct communication between the gas outlet of the gas-liquid separator and the gas inlet of the condensation separator, direct communication between the condensation return water outlet of the condensation separator and the condensation return water inlet of the gas-liquid separator, and the fixing method of the condensation separator on the gas-liquid separator includes but is not limited to a saddle support. Through this connection and fixing method, the detour and bends in the pipeline connection between the equipment are reduced, and the equipment layout space is saved.

[0058] In the utility model, a heat exchange zone, a gravity separation zone and a water storage zone are arranged inside the condensation separator. The heat exchange device of the heat exchange zone includes but is not limited to heat exchange of a condensation tube bundle. The gravity separation zone is arranged above the heat exchange zone, and the water storage zone is arranged below the heat exchange zone to store pure water at a set temperature. The condensation separator has the functions of condensation separation and gravity separation of gas-liquid two-phases and can store pure water at a set temperature. The cold water inlet pipeline of the condensation separator is provided with an automatic regulating valve to control the water storage zone of the condensation separator to maintain the set temperature. The condensation return water outlet pipeline of the condensation separator is provided with an automatic regulating valve to adjust the bottom water storage in the gas-liquid separator to maintain the water temperature condition required by the electrolytic cell, and fully recover the pure water in the hydrogen-water mixture and the oxygen-water mixture to the electrolytic cell for reuse. The bottom design of the condensation separator is conducive to the discharge of condensed water from the condensation return water outlet, including but not limited to setting the inclination angle of the cylinder body to be inclined to the condensation return water outlet. The condensation separator is provided with measures that are conducive to the gas entering the condensation separator from the gas inlet, including but not limited to extending the gas inlet of the condensation separator into the heat exchange zone.

[0059] In the utility model, various forms of internal component designs can be carried out inside the gas-liquid separator, including but not limited to setting a guide plate at the inlet of the gas-liquid mixture, setting a baffle inside the gas-liquid separator, setting a mist collector at the gas outlet of the gas-liquid separator, and setting a liquid seal at the condensation return pipe mouth where the condensation separator is connected to the gas-liquid separator. The form of the liquid seal includes but is not limited to extending the condensation return pipe mouth into the interior of the gas-liquid separator, and setting a water storage baffle at the outlet of the condensation return pipe mouth, to ensure that the liquid phase is recovered from the condensation separator by gravity self-flow and stored in the gas-liquid separator, and the pipe mouth is closed in the liquid phase space and no air can enter.

[0060] As described above, the utility model can be implemented well.

[0061] The above is only a preferred embodiment of the utility model and does not limit the utility model in any form. According to the technical essence of the utility model, within the spirit and principles of the utility model, any simple modification, equivalent replacement and improvement made to the above embodiment still falls within the protection scope of the technical solution of the utility model.

Claims

1. A gas-liquid separation device for a water electrolysis hydrogen production system, It is characterized in that The invention comprises a hydrogen-water gas-liquid separator (51), a hydrogen condensation separator (52), an oxygen condensation separator (54), and an oxygen-water gas-liquid separator (53) which are connected in sequence, and the hydrogen-water gas-liquid separator (51) is connected to the oxygen-water gas-liquid separator (53).

2. The gas-liquid separation device of a water electrolysis hydrogen production system according to claim 1, It is characterized in that The hydrogen-water gas-liquid separator (51) is provided with a hydrogen-water mixture inlet (1), a hydrogen-water gas-liquid separator pure water outlet (4), a hydrogen-water gas-liquid separator hydrogen outlet (3), and a hydrogen-water gas-liquid separator condensate return water inlet (2); The oxygen-water gas-liquid separator (53) is provided with an oxygen-water mixture inlet (22), an oxygen-water gas-liquid separator pure water outlet (25), an oxygen-water gas-liquid separator oxygen outlet (24), and an oxygen-water gas-liquid separator condensed water return inlet (23); The hydrogen condensation separator (52) is provided with a hydrogen condensation separator hydrogen inlet (15), a hydrogen condensation separator condensate return water outlet (14), a hydrogen condensation separator hydrogen outlet (13), a hydrogen condensation separator cold water outlet (16), and a hydrogen condensation separator cold water inlet (17); The oxygen condensation separator (54) is provided with an oxygen condensation separator oxygen inlet (35), an oxygen condensation separator condensation return water outlet (34), an oxygen-water condensation separator oxygen outlet (33), an oxygen condensation separator cold water outlet (36), and an oxygen condensation separator cold water inlet (37); The condensation return water inlet (2) of the hydrogen-water gas-liquid separator is connected to the condensation return water outlet (14) of the hydrogen condensation separator, and the hydrogen outlet (3) of the hydrogen-water gas-liquid separator is connected to the hydrogen inlet (15) of the hydrogen condensation separator; The cold water outlet (16) of the hydrogen condensation separator is connected to the cold water outlet (36) of the oxygen condensation separator, and the cold water inlet (17) of the hydrogen condensation separator is connected to the cold water inlet (37) of the oxygen condensation separator; The oxygen outlet (24) of the oxygen-water gas-liquid separator is connected to the oxygen inlet (35) of the oxygen condensation separator, and the condensation return water inlet (23) of the oxygen-water gas-liquid separator is connected to the condensation return water outlet (34) of the oxygen condensation separator; The pure water outlet (4) of the hydrogen-water gas-liquid separator is communicated with the pure water outlet (25) of the oxygen-water gas-liquid separator.

3. The gas-liquid separation device of a water electrolysis hydrogen production system according to claim 2, It is characterized in that The hydrogen-water mixture inlet (1) is arranged at the upper part of the hydrogen-water gas-liquid separator (51), and the hydrogen-water gas-liquid separator pure water outlet (4) is arranged at the lower part of the hydrogen-water gas-liquid separator (51); the oxygen-water mixture inlet (22) is arranged at the upper part of the oxygen-water gas-liquid separator (53), and the oxygen-water gas-liquid separator pure water outlet (25) is arranged at the lower part of the oxygen-water gas-liquid separator (53).

4. The gas-liquid separation device of a water electrolysis hydrogen production system according to claim 2, It is characterized in that The inner wall surface of the hydrogen-water mixture inlet (1) is provided with a hydrogen-water mixture inlet baffle (7) and a hydrogen-water flow baffle (8), and the inner wall surface of the oxygen-water mixture inlet (22) is provided with an oxygen-water mixture inlet baffle (27) and an oxygen-water flow baffle (28).

5. The gas-liquid separation device of a water electrolysis hydrogen production system according to claim 2, It is characterized in that The hydrogen inlet (15) of the hydrogen condensation separator is located at the lower part of the hydrogen condensation separator (52), the condensation return water outlet (14) of the hydrogen condensation separator is located at the lower part of the hydrogen condensation separator (52), and the hydrogen outlet (13) of the hydrogen condensation separator is located at the upper part of the hydrogen condensation separator (52); The oxygen inlet (35) of the oxygen condensation separator is located at the lower part of the oxygen condensation separator (54), the condensation return water outlet (34) of the oxygen condensation separator is located at the lower part of the oxygen condensation separator (54), and the oxygen outlet (33) of the oxygen-water condensation separator is located at the upper part of the oxygen condensation separator (54).

6. The gas-liquid separation device of a water electrolysis hydrogen production system according to claim 2, It is characterized in that A hydrogen condensation separator cold water inlet valve (21) is provided on the pipeline of the hydrogen condensation separator cold water inlet (17), and a hydrogen condensation separator condensation return water outlet valve (20) is provided on the pipeline of the hydrogen condensation separator condensation return water outlet (14); an oxygen condensation separator cold water inlet valve (41) is provided on the pipeline of the oxygen condensation separator cold water inlet (37), and an oxygen condensation separator condensation return water outlet valve (40) is provided on the pipeline of the oxygen-water gas-liquid separator condensation return water inlet (23).

7. The gas-liquid separation device of a water electrolysis hydrogen production system according to claim 2, It is characterized in that The hydrogen-water gas-liquid separator (51) is provided with a hydrogen-water gas-liquid separator liquid level meter (5), and the oxygen-water gas-liquid separator (53) is provided with an oxygen-water gas-liquid separator liquid level meter (26).

8. The gas-liquid separation device of a water electrolysis hydrogen production system according to claim 2, It is characterized in that The hydrogen-water gas-liquid separator (51) is provided with a hydrogen-water gas-liquid separator thermometer (11), and the oxygen-water gas-liquid separator (53) is provided with an oxygen-water gas-liquid separator thermometer (31); the hydrogen condensation separator (52) is provided with a hydrogen condensation separator thermometer (19), and the oxygen condensation separator (54) is provided with an oxygen condensation separator thermometer (39).

9. The gas-liquid separation device of a water electrolysis hydrogen production system according to claim 2, It is characterized in that The hydrogen outlet (3) of the hydrogen-water gas-liquid separator is connected to a hydrogen outlet wire mesh mist collector (10), and the oxygen outlet (24) of the oxygen-water gas-liquid separator is connected to an oxygen outlet wire mesh mist collector (30).

10. A gas-liquid separation device for a water electrolysis hydrogen production system according to any one of claims 1 to 9, It is characterized in that A hydrogen condensation separator heat exchange device (18) is provided in the hydrogen condensation separator (52), and an oxygen condensation separator heat exchange device (38) is provided in the oxygen condensation separator (54).

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