Gas separation device, water electrolysis hydrogen production device system and application of water electrolysis hydrogen production device system

Abstract

The invention relates to a gas separation device, a water electrolysis hydrogen production device system and application of the water electrolysis hydrogen production device system, the gas separation device not only can realize gas-liquid separation, but also can realize removal of impurities and iron suspended matters, the gas-liquid separation efficiency is improved, and the corrosion degree of alkali liquor in gas to gas subsequent treatment is weakened; moreover, the electrolytic water hydrogen production device system can avoid adverse effects caused by suspended solids and sediments formed by dissolved iron, solves the problems that the suspended solids block micropores of a diaphragm part and consequently the resistance of the diaphragm is increased, and solves the problems that the electrolysis energy consumption is increased and the hydrogen evolution performance of a cathode is reduced; and the performance and the service life of the water electrolysis hydrogen production device system are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of water electrolysis hydrogen production, and relates to an alkaline water electrolysis hydrogen production system and applications thereof, and in particular to a gas separation device, a water electrolysis hydrogen production device system and applications thereof. Background Art

[0002] Alkaline water electrolysis is the current mainstream method for producing hydrogen by water electrolysis. The electrolysis process includes the anodic oxygen evolution reaction and the cathode hydrogen evolution reaction in the alkaline electrolyte. The overpotential and current density of these two electrochemical reactions have a crucial influence on the energy consumption and hydrogen production rate of water electrolysis.

[0003] Precious metals Ru or Ir have good oxygen evolution performance in the oxygen evolution reaction (OER), but they are expensive and not suitable for large-scale use. Nickel mesh, nickel foam or Raney nickel are often used as oxygen evolution electrode materials in industry, but due to the limited OER activity of nickel itself, these electrodes cannot meet the needs of high current density water electrolysis for hydrogen production.

[0004] The nickel-iron electrode obtained by adding a small amount of iron to nickel can greatly improve the oxygen evolution current density. The nickel-iron electrode shows excellent oxygen evolution activity and stability in low-concentration alkaline solution, but there is a defect that the iron element dissolves slowly under high temperature and strong alkaline conditions. The solubility of iron in alkaline electrolyte is not high, and solid suspended matter or precipitation such as iron hydroxide or oxide will gradually form. On the one hand, the suspended matter or precipitation will block some of the micropores of the diaphragm, resulting in an increase in the resistance of the diaphragm, further leading to an increase in the energy consumption of electrolysis; on the other hand, the suspended matter or precipitation is deposited on the cathode, resulting in a decrease in the hydrogen evolution performance of the cathode.

[0005] CN114717608A discloses a long-life alkaline water electrolysis system and control method, the system includes a hydrogen separator, an oxygen separator and an electrolyzer, the liquid outlets of the hydrogen separator and the oxygen separator are connected to an alkaline solution circulation pump, the alkaline solution circulation pump is connected to an adsorption unit, an alkaline solution cooler and an electrolyzer liquid inlet in sequence through a pipeline, and the two gas outlets of the electrolyzer are connected to the gas inlets of the hydrogen separator and the oxygen separator respectively through pipelines; the gas outlet is connected to a dealkalization unit in sequence through a pipeline. It removes impurities in the alkaline electrolyte through the adsorption unit, but the adsorption unit is a filtering device in conventional technology and is only suitable for solid particles with larger particle sizes.

[0006] CN103463872A discloses a single-layer dust reduction chamber, which includes a dust reduction box, a gas inlet pipe and a gas outlet pipe are respectively arranged on the front and rear sides of the dust reduction box, a plurality of dust particle hoppers are arranged on the bottom surface of the dust reduction chamber, and cross-direction change plates are evenly arranged in the dust reduction box. The single-layer dust reduction chamber can settle large solid particles, but cannot be used for the separation of iron oxides or hydroxides with smaller particle sizes.

[0007] Since the particle size of solid suspended matter or precipitate such as iron hydroxide or oxide is small (particle size ≤ 30 μm), it is difficult to remove it through conventional filtering devices; the use of mesh filtering devices with too fine pores will increase the flow resistance of alkaline electrolyte, thereby causing the flow rate of electrolyte to decrease. Therefore, it is necessary to provide a gas separation device with low impedance, a water electrolysis hydrogen production device system and its application. Summary of the invention

[0008] The object of the present invention is to provide a gas separation device, a water electrolysis hydrogen production device system and applications thereof. The use of the gas separation device in the water electrolysis hydrogen production device system can effectively settle the iron suspension in the electrolyte, solve the problem of iron suspension blocking the micropores of some diaphragms, and avoid the increase of diaphragm resistance, the increase of energy consumption and the decrease of cathode hydrogen evolution performance.

[0009] In order to achieve the purpose of the invention, the present invention adopts the following technical solutions:

[0010] In a first aspect, the present invention provides a gas separation device, the gas separation device comprising a gas-liquid separation chamber;

[0011] The bottom of the gas-liquid separation chamber is divided into a liquid inlet chamber and a liquid outlet chamber by a baffle plate; the liquid inlet chamber is connected to the top of the liquid outlet chamber;

[0012] The side wall of the liquid inlet chamber is provided with a liquid inlet, and the side wall of the liquid outlet chamber is provided with a liquid outlet; the heights of the liquid inlet and the liquid outlet are both lower than the height of the baffle plate, and the height of the liquid outlet is higher than the height of the liquid inlet;

[0013] The bottom of the gas separation device is provided with a sewage outlet, and the top of the gas separation device is provided with an exhaust port.

[0014] The gas separation device provided by the present invention also includes necessary pipelines and valves, which are not specifically limited in the present invention and those skilled in the art can reasonably configure them according to needs.

[0015] In the gas separation device provided by the present invention, the flow direction of the electrolyte is changed by the provision of the baffle plate, thereby achieving a reduction in the flow rate of the electrolyte. Moreover, when the electrolyte in the liquid inlet chamber flows upward, the suspended matter in the electrolyte gradually settles due to the effect of gravity and the effect of the slowing flow rate; the suspended matter that has not settled in the liquid inlet chamber passes over the baffle plate with the electrolyte and changes the flow direction, and the suspended matter is further settled in combination with the effect of gravity. Therefore, the gas separation device provided by the present invention can solve the problem of suspended matter blocking part of the micropores of the diaphragm, resulting in an increase in the resistance of the diaphragm, and solves the problem of increased electrolysis energy consumption and decreased cathode hydrogen evolution performance.

[0016] The gas separation device of the present invention is provided with a drain outlet at the bottom, which means that the bottom of the liquid inlet chamber and / or the bottom of the liquid outlet chamber are provided with a drain outlet, and the provision of the drain outlet is conducive to discharging pollutants in the gas separation device.

[0017] Preferably, a condensing element and a liquid-catching element are sequentially arranged on the top of the gas-liquid separation chamber in a direction from low to high in height.

[0018] The gas separation device provided by the present invention is provided with a condensing element and a liquid catching element, wherein the condensing element forms a low temperature through a refrigerant to accelerate the condensation of liquid droplets in the gas; the liquid that has not condensed on the condensing element is further condensed through the liquid catching element, and the condensed liquid drips into the gas-liquid separation chamber of the gas separation device through the action of gravity, thereby reducing the liquid content in the gas and facilitating gas-liquid separation.

[0019] The liquid-catching member of the present invention includes but is not limited to a liquid-catching net or a drip-replenishing net.

[0020] Exemplarily, the condensing element of the present invention includes a refrigerant inlet and a refrigerant outlet disposed in the gas separation device;

[0021] The refrigerant inlet and the refrigerant outlet are connected through a condensing coil inside the gas-liquid separation chamber.

[0022] The present invention increases the heat exchange area between the condensing element and the gas by disposing the condensing coil, and also increases the condensation area of ​​the droplets, thereby improving the condensation efficiency.

[0023] Preferably, a liquid outlet baffle is obliquely arranged in the liquid outlet chamber;

[0024] One end of the liquid outlet baffle is connected to the side wall above the liquid outlet, and the other end extends to the bottom of the liquid outlet.

[0025] The present invention arranges a liquid outlet baffle so that the suspended matter that has not settled in the liquid inlet chamber can pass over the baffle with the electrolyte and change the flow direction, and further settle the iron suspended matter in combination with the action of gravity; the supernatant in the liquid outlet chamber is decelerated by the liquid outlet baffle, settles again, and finally flows out at the liquid outlet.

[0026] As a preferred technical solution, a liquid inlet baffle is obliquely arranged in the liquid inlet chamber;

[0027] One end of the liquid inlet baffle is connected to the side wall above the liquid inlet, and the other end extends to the bottom of the liquid inlet.

[0028] The present invention arranges the liquid inlet baffle plate so that the suspended matter entering the liquid inlet chamber for settling changes its flow direction with the electrolyte under the action of the liquid inlet baffle plate, and realizes the initial settling of the suspended matter in combination with the action of gravity.

[0029] Preferably, the gas separation device is further provided with an external magnetic attraction member;

[0030] The external magnetic attraction component is arranged outside the gas separation device and is located below the liquid inlet.

[0031] The external magnetic attraction component described in the present invention includes but is not limited to a magnet; the present invention can accelerate the sedimentation of suspended iron by setting the external magnetic attraction component; and the external magnetic attraction component is set below the liquid inlet, ensuring that the suspended iron can be attracted by the external force of the magnet from the liquid inlet, thereby increasing the sedimentation efficiency; in addition, the liquid outlet of the iron suspension sedimentation device is higher than the liquid inlet, ensuring that the supernatant is not affected by the suspended iron attracted by the magnet, and the suspended iron in the supernatant can be effectively removed.

[0032] Preferably, the volume of the liquid inlet chamber is greater than the volume of the liquid outlet chamber.

[0033] The present invention increases the flow rate in the liquid outlet chamber by making the volume of the liquid inlet chamber larger than that of the liquid outlet chamber, and facilitates the sedimentation of suspended matter that has not settled in the liquid inlet chamber in the liquid outlet chamber in combination with the gravity effect.

[0034] Preferably, the gas separation device comprises a liquid level measuring member;

[0035] The liquid level measuring element is used to detect the liquid level height in the gas separation device.

[0036] Preferably, the gas separation device is also provided with a differential pressure gauge interface;

[0037] The differential pressure gauge interface is used to connect a differential pressure gauge.

[0038] The present invention provides a differential pressure gauge interface in the gas separation device, which facilitates the installation of a pressure sensor to monitor the pressure of the inner wall of the gas separation device in real time. The present invention does not limit the specific position of the differential pressure gauge interface, as long as the function of the differential pressure gauge can be realized.

[0039] Exemplarily, the material of the gas separation device of the present invention includes a corrosion-resistant material. Specifically, the corrosion-resistant material is a material resistant to corrosion by chloride ions and trivalent iron ions. Those skilled in the art can select a suitable material according to actual use needs, and the present invention does not make specific limitations here.

[0040] In a second aspect, the present invention provides a water electrolysis hydrogen production device system, wherein the hydrogen separator and / or oxygen separator in the water electrolysis hydrogen production system is the gas separation device described in the first aspect.

[0041] As a preferred technical solution, the hydrogen separator and oxygen separator in the water electrolysis hydrogen production system are the gas separation devices described in the first aspect.

[0042] The use of the gas separation device in the water electrolysis hydrogen production device system of the present invention can solve the problem of suspended matter blocking the micropores of the diaphragm part and causing the diaphragm resistance to increase, solve the problem of increased electrolysis energy consumption and decreased cathode hydrogen evolution performance, and improve the performance and service life of the water electrolysis hydrogen production device system.

[0043] Preferably, the water electrolysis hydrogen production device system comprises an electrolyzer, a hydrogen separator, an oxygen separator and a post-processing unit;

[0044] The post-processing unit includes a cooling device and a filtering device connected in sequence;

[0045] The two discharge ports of the electrolyzer are respectively connected to the liquid inlets of the hydrogen separator and the oxygen separator through pipelines;

[0046] The liquid outlets of the hydrogen separator and the oxygen separator are connected to the feed inlet of the cooling device;

[0047] The discharge port of the filtering device is connected to the feed port of the electrolytic cell.

[0048] The water electrolysis hydrogen production device system of the present invention also includes a circulation device for driving the flow of electrolyte, including but not limited to a circulation pump.

[0049] The filtering device in the post-processing unit described in the present invention is a conventional filtering device in the art. The conventional filtering device in the art can only filter solid impurities and cannot effectively filter magnetic iron suspensions. The present invention does not impose too many limitations on its structure.

[0050] Preferably, a sampling port is provided at the liquid inlet or outlet of the circulation pump to facilitate sampling, analysis and detection.

[0051] The water electrolysis hydrogen production device of the present invention also includes an alkali tank for preparing and storing electrolyte, and a water tank for storing water that needs to be replenished.

[0052] The present invention does not limit the specific positions of the alkali tank and the water tank, as long as electrolysis of water and water replenishment can be achieved.

[0053] Exemplarily, when the water electrolysis hydrogen production device system is used, a DC power supply is used to power the electrolyzer, and the electrolyte in the electrolyzer is electrolyzed to form hydrogen and oxygen; hydrogen enters the hydrogen separator with the electrolyte, and oxygen enters the oxygen separator with the electrolyte. Hydrogen is discharged through the upper end of the hydrogen separator for subsequent treatment; oxygen is discharged through the upper end of the oxygen separator for subsequent treatment. The lower ends of the hydrogen separator and the oxygen separator are electrolyte outlets, which enter the post-processing unit for cooling and filtering, and flow into the electrolyzer for circulation.

[0054] In a third aspect, the present invention provides an application of a water electrolysis hydrogen production device system as described in the second aspect, wherein during the process of water electrolysis hydrogen production device system performing water electrolysis hydrogen production, a hydrogen separator and / or an oxygen separator is used to remove suspended iron in the electrolyzed water.

[0055] Exemplarily, the application includes the following steps:

[0056] (1) a KOH electrolyte with a concentration of 30 wt% is prepared in an alkali tank, and the electrolyte is pumped into an iron suspension sedimentation device through a circulation pump to ensure that the inlet flow rate of the iron suspension sedimentation device is consistent with the outlet flow rate, and then the inlet and outlet of the iron suspension sedimentation device are closed;

[0057] (2) Pumping the electrolyte into the water electrolysis hydrogen production device system through a circulation pump, opening the liquid inlet and liquid outlet of the hydrogen separator and the oxygen separator to ensure the normal circulation of the alkaline electrolyte, turning on the condensation component, and cooling the condensation component through a refrigerant such as cold water or cold air;

[0058] (3) The electrolytic water system is turned on to start electrolysis. The electrolyte in the electrolytic cell is electrolyzed to form hydrogen and oxygen. The hydrogen enters the hydrogen separator together with the electrolyte, and the oxygen enters the oxygen separator together with the electrolyte. The hydrogen is discharged through the upper end of the hydrogen separator, and the oxygen is discharged through the upper end of the oxygen separator. The lower ends of the oxygen separator and the hydrogen separator are the liquid outlets. After flowing through the cooling device and the filtering device, the liquid is pumped into the electrolytic cell by the circulation pump for circulation.

[0059] During the electrolysis process, the suspended matter settles to the bottom of the hydrogen separator and the oxygen separator; according to a certain period, the external magnetic suction part is moved up and down below the liquid inlet to open the sewage outlet and perform sewage discharge operations.

[0060] Compared with the prior art, the present invention has the following beneficial effects:

[0061] In the gas separation device provided by the present invention, the flow direction of the electrolyte is changed by the provision of the baffle plate, thereby achieving a reduction in the flow rate of the electrolyte. Moreover, when the electrolyte in the liquid inlet chamber flows upward, the suspended matter in the electrolyte gradually settles due to the effect of gravity and the effect of the slowing flow rate; the suspended matter that has not settled in the liquid inlet chamber passes over the baffle plate with the electrolyte and changes the flow direction, and the suspended matter is further settled in combination with the effect of gravity. Therefore, the gas separation device provided by the present invention can solve the problem of suspended matter blocking part of the micropores of the diaphragm, resulting in an increase in the resistance of the diaphragm, and solves the problem of increased electrolysis energy consumption and decreased cathode hydrogen evolution performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Figure 1 is a schematic structural diagram of a gas separation device provided in Example 1;

[0063] Figure 2is a schematic structural diagram of a gas separation device provided in Example 2;

[0064] Figure 3 This is a schematic diagram of the structure of the water electrolysis hydrogen production device system provided for Application Example 1-2.

[0065] Among them: 11, baffle plate; 12, liquid outlet baffle plate; 13, liquid inlet; 14, liquid outlet; 15, exhaust port; 16, external magnetic device; 17, sewage outlet; 18, refrigerant inlet; 19, refrigerant outlet; 110, liquid catching member; 111, liquid inlet baffle plate; 1, electrolytic cell; 2, hydrogen separator; 3, oxygen separator; 4, cooling device; 5, filtering device. DETAILED DESCRIPTION

[0066] The technical solution of the present invention is further described below by specific implementation methods. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0067] Example 1

[0068] This embodiment provides a Figure 1 The gas separation device shown comprises a gas-liquid separation chamber;

[0069] The bottom of the gas-liquid separation chamber is divided into a liquid inlet chamber and a liquid outlet chamber by a baffle plate 11; the liquid inlet chamber is connected to the top of the liquid outlet chamber; the volume of the liquid inlet chamber is 1.2 times the volume of the liquid outlet chamber;

[0070] A liquid outlet baffle 12 is obliquely arranged in the liquid outlet chamber; one end of the liquid outlet baffle 12 is connected to the side wall above the liquid outlet 14, and the other end extends to the bottom of the liquid outlet 14;

[0071] The side wall of the liquid inlet chamber is provided with a liquid inlet 13, and the side wall of the liquid outlet chamber is provided with a liquid outlet 14; the heights of the liquid inlet 13 and the liquid outlet 14 are both lower than the height of the baffle 11, and the height of the liquid outlet 14 is higher than the height of the liquid inlet 13;

[0072] The top of the gas-liquid separation chamber is provided with a condensation element and a liquid-catching element 110 in order from low to high in height; the liquid-catching element 110 is a liquid-catching net;

[0073] The bottom of the gas separation device is provided with a sewage outlet 17, and the top of the gas separation device is provided with an exhaust port 15.

[0074] The condensing element includes a refrigerant inlet 18 and a refrigerant outlet 19 which are arranged on the gas separation device; the refrigerant inlet 18 and the refrigerant outlet 19 are connected through a condensing coil inside the gas-liquid separation chamber.

[0075] The gas separation device is further provided with an external magnetic attraction component 16 ; the external magnetic attraction component 16 is arranged outside the gas separation device and is located below the liquid inlet 13 .

[0076] The gas separation device comprises a liquid level measuring component (not shown in the figure); the liquid level measuring component is used to detect the liquid level height in the gas separation device.

[0077] The gas separation device is also provided with a differential pressure gauge interface (not shown in the figure), and the differential pressure gauge interface is used to connect a differential pressure gauge.

[0078] Example 2

[0079] This embodiment provides a Figure 2 Compared with the embodiment 1, the gas separation device provided in the embodiment further includes a liquid inlet baffle 111 which is arranged obliquely in the liquid inlet chamber;

[0080] One end of the liquid inlet baffle 111 is connected to the side wall above the liquid inlet 13 , and the other end extends to the bottom of the liquid inlet 13 .

[0081] Comparative Example 1

[0082] This comparative example provides a gas separation device, which is the same as Example 1 except that the baffle plate 11 is not provided.

[0083] Comparative Example 2

[0084] This comparative example provides a gas separation device, which is the same as Example 1 except that no condensation element is provided.

[0085] Application Example 1

[0086] This application example provides a Figure 3 The water electrolysis hydrogen production device system shown includes an electrolyzer 1, a hydrogen separator 2, an oxygen separator 3 and a post-processing unit;

[0087] The post-processing unit comprises a cooling device 4 and a filtering device 5 connected in sequence;

[0088] The two discharge ports of the electrolyzer 1 are connected to the liquid inlet 13 of the hydrogen separator 2 and the oxygen separator 3 respectively through pipelines;

[0089] The liquid outlets 14 of the hydrogen separator 2 and the oxygen separator 3 are connected to the feed inlet of the cooling device 4;

[0090] The discharge port of the filtering device 5 is connected to the feed port of the electrolytic cell 1 .

[0091] The hydrogen separator 2 and the oxygen separator 3 are respectively and independently the gas separation devices provided in Example 1.

[0092] When the water electrolysis hydrogen production device system is used, a DC power supply is used to power the electrolyzer 1, and the electrolyte in the electrolyzer 1 is electrolyzed to form hydrogen and oxygen; hydrogen enters the hydrogen separator 2 along with the electrolyte, and oxygen enters the oxygen separator 3 along with the electrolyte; hydrogen is discharged through the exhaust port 15 of the hydrogen separator 2 for subsequent treatment; oxygen is discharged through the exhaust port 15 of the oxygen separator 3 for subsequent treatment; the lower ends of the hydrogen separator 2 and the oxygen separator 3 are liquid outlets 14, and the liquid flows out from the liquid outlet 14, enters the post-processing unit for conventional cooling treatment and filtering treatment, and then flows into the electrolyzer 1 for circulation under the transportation of the circulation device.

[0093] When the water electrolysis hydrogen production device system provided in this application example is used, the anode in the electrolytic cell 1 is a nickel-iron alloy oxygen evolution electrode, the cathode is a commercial porous nickel cathode (N6), and the diaphragm is a commercial polyphenylene sulfide diaphragm (6165A4SD3002);

[0094] The application method includes the following steps:

[0095] (1) A KOH electrolyte with a concentration of 30 wt% and a temperature of 85°C is prepared in the alkali tank, and the electrolyte is pumped into the electrolytic water hydrogen production device system through a circulation pump to make the inlet flow rate and outlet flow rate of the hydrogen separator 2 and the oxygen separator 3 consistent.

[0096] (2) Pumping the electrolyte into the water electrolysis hydrogen production device system through a circulation pump, opening the liquid inlet 13 and the liquid outlet 14 of the hydrogen separator 2 and the oxygen separator 3 to ensure the normal circulation of the alkaline electrolyte, turning on the condensation component, and cooling the condensation component through the refrigerant;

[0097] (3) Turn on the water electrolysis system and start electrolysis with a current density of 6000A / m 2 , the electrolyte flow rate is 600L / h, the electrolyte in the electrolytic cell 1 is electrolyzed to form hydrogen and oxygen, the hydrogen enters the hydrogen separator 2 together with the electrolyte, the oxygen enters the oxygen separator 3 together with the electrolyte, the hydrogen is discharged through the upper end of the hydrogen separator 2, and the oxygen is discharged through the upper end of the oxygen separator 3; the lower ends of the oxygen separator 3 and the hydrogen separator 2 are the liquid outlet 14, after flowing through the cooling device 4 and the filtering device 5, it is pumped into the electrolytic cell 1 by the circulation pump for circulation;

[0098] In this application example, after the electrolyte was circulated and electrolyzed for 12 hours, a sample was taken from the sampling port for analysis. After cooling, filtering, washing, drying, and weighing, the mass percentage of solid suspended matter was 0.1243 g / L. During the 72-hour test period, the cell voltage rose by less than 0.1 V, which was within the normal fluctuation range. The purity of hydrogen discharged from the hydrogen separator was tested to be 99.85%, and the purity of oxygen discharged from the oxygen separator was 99.82%.

[0099] Application Example 2

[0100] This application example provides a Figure 3 The water electrolysis hydrogen production device system shown includes an electrolyzer 1, a hydrogen separator 2, an oxygen separator 3 and a post-processing unit;

[0101] The post-processing unit comprises a cooling device 4 and a filtering device 5 connected in sequence;

[0102] The two discharge ports of the electrolyzer 1 are connected to the liquid inlet 13 of the hydrogen separator 2 and the oxygen separator 3 respectively through pipelines;

[0103] The liquid outlets 14 of the hydrogen separator 2 and the oxygen separator 3 are connected to the feed inlet of the cooling device 4;

[0104] The discharge port of the filtering device 5 is connected to the feed port of the electrolytic cell 1 .

[0105] The hydrogen separator 2 and the oxygen separator 3 are respectively and independently the gas separation devices provided in Example 2.

[0106] When the water electrolysis hydrogen production device system is used, a DC power supply is used to power the electrolyzer 1, and the electrolyte in the electrolyzer 1 is electrolyzed to form hydrogen and oxygen; hydrogen enters the hydrogen separator 2 along with the electrolyte, and oxygen enters the oxygen separator 3 along with the electrolyte; hydrogen is discharged through the exhaust port 15 of the hydrogen separator 2 for subsequent treatment; oxygen is discharged through the exhaust port 15 of the oxygen separator 3 for subsequent treatment; the lower ends of the hydrogen separator 2 and the oxygen separator 3 are liquid outlets 14, and the liquid flows out from the liquid outlet 14, enters the post-processing unit for conventional cooling treatment and filtering treatment, and then flows into the electrolyzer 1 for circulation under the transportation of the circulation device.

[0107] When the water electrolysis hydrogen production device system provided in this application example is used, the anode in the electrolytic cell 1 is a nickel-iron alloy oxygen evolution electrode, the cathode is a commercial porous nickel cathode (N6), and the diaphragm is a commercial polyphenylene sulfide diaphragm (6165A4SD3002);

[0108] The application method includes the following steps:

[0109] (1) A KOH electrolyte with a concentration of 30 wt% and a temperature of 85°C is prepared in the alkali tank, and the electrolyte is pumped into the electrolytic water hydrogen production device system through a circulation pump to make the inlet flow rate and outlet flow rate of the hydrogen separator 2 and the oxygen separator 3 consistent.

[0110] (2) Pumping the electrolyte into the water electrolysis hydrogen production device system through a circulation pump, opening the liquid inlet 13 and the liquid outlet 14 of the hydrogen separator 2 and the oxygen separator 3 to ensure the normal circulation of the alkaline electrolyte, turning on the condensation component, and cooling the condensation component through the refrigerant;

[0111] (3) Turn on the water electrolysis system and start electrolysis with a current density of 6000A / m 2 , the electrolyte flow rate is 600L / h, the electrolyte in the electrolytic cell 1 is electrolyzed to form hydrogen and oxygen, the hydrogen enters the hydrogen separator 2 together with the electrolyte, the oxygen enters the oxygen separator 3 together with the electrolyte, the hydrogen is discharged through the upper end of the hydrogen separator 2, and the oxygen is discharged through the upper end of the oxygen separator 3; the lower ends of the oxygen separator 3 and the hydrogen separator 2 are the liquid outlet 14, after flowing through the cooling device 4 and the filtering device 5, it is pumped into the electrolytic cell 1 by the circulation pump for circulation;

[0112] In this application example, after the electrolyte was circulated and electrolyzed for 12 hours, samples were taken from the sampling port for analysis. After cooling, filtering, washing, drying, and weighing, the mass percentage of solid suspended matter was 0.1123 g / L. During the 72-hour test period, the cell voltage rose by less than 0.1 V, which was within the normal fluctuation range. The purity of hydrogen discharged from the hydrogen separator was tested to be 99.83%, and the purity of oxygen discharged from the oxygen separator was 99.84%.

[0113] Comparative application example 1

[0114] This comparative application example provides a water electrolysis hydrogen production device system, except that the hydrogen separator 2 and the oxygen separator 3 in the water electrolysis hydrogen production device system are independently the gas separation devices provided in comparative example 1, the rest are the same as application example 1.

[0115] In this application example, after the electrolyte was circulated and electrolyzed for 12 hours, samples were taken from the sampling port for analysis. After cooling, filtering, washing, drying, and weighing analysis, the mass percentage of solid suspended matter was 1.0231 g / L, which was significantly higher than that in Application Example 1. During the 72-hour test, the cell voltage rose by 0.32 V, and the voltage increase was significantly higher than that in Application Example 1. It can be seen that when the baffle 11 is not set, the solid suspended matter content and the cell pressure are increased. The purity of hydrogen discharged from the hydrogen separator was tested to be 99.83%, and the purity of oxygen discharged from the oxygen separator was 99.82%. The gas purity of Application Example 1 is basically consistent with that of Application Example 1.

[0116] Comparative Application Example 2

[0117] This comparative application example provides a water electrolysis hydrogen production device system, except that the hydrogen separator 2 and the oxygen separator 3 in the water electrolysis hydrogen production device system are independently gas separation devices provided in comparative example 2, the rest are the same as application example 1.

[0118] In this application example, after the electrolyte was circulated and electrolyzed for 12 hours, samples were taken from the sampling port for analysis. After cooling, filtering, washing, drying, and weighing, the mass percentage of solid suspended matter was 0.1257 g / L. During the 72-hour test period, the cell voltage rose by less than 0.1 V, which was within the normal fluctuation range. The purity of hydrogen discharged from the hydrogen separator was 98.3%, and the purity of oxygen discharged from the oxygen separator was 98.2%. It can be seen that when no condensing element is set, the gas purity of the comparative application example 2 is lower than that of the application example 1.

[0119] In summary, in the gas separation device provided by the present invention, the flow direction of the electrolyte is changed by the setting of the baffle, so that the flow rate of the electrolyte is reduced. Moreover, when the electrolyte in the liquid inlet chamber flows upward, the suspended matter in the electrolyte gradually settles due to the action of gravity and the effect of slowing down the flow rate; the suspended matter that has not settled in the liquid inlet chamber passes over the baffle with the electrolyte and changes the flow direction, and the suspended matter is further settled by the action of gravity. Therefore, the gas separation device provided by the present invention can solve the problem that the suspended matter blocks the micropores of the diaphragm part and causes the diaphragm resistance to increase, and solves the problem of increased electrolysis energy consumption and decreased cathode hydrogen evolution performance; the gas separation device provided by the present invention is provided with a condensing member and a liquid catching member, wherein the condensing member forms a low temperature through a refrigerant to accelerate the condensation of liquid droplets in the gas; the liquid that has not condensed on the condensing member is further condensed by the liquid catching member, and the condensed liquid drips into the gas-liquid separation chamber of the gas separation device by the action of gravity, thereby reducing the liquid content in the gas and facilitating gas-liquid separation.

[0120] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention are within the protection scope and disclosure scope of the present invention.

Claims

1. A gas separation device, characterized in that: The gas separation device comprises a gas-liquid separation chamber; The bottom of the gas-liquid separation chamber is divided into a liquid inlet chamber and a liquid outlet chamber by a baffle plate; the liquid inlet chamber is connected to the top of the liquid outlet chamber; The side wall of the liquid inlet chamber is provided with a liquid inlet, and the side wall of the liquid outlet chamber is provided with a liquid outlet; the heights of the liquid inlet and the liquid outlet are both lower than the height of the baffle plate, and the height of the liquid outlet is higher than the height of the liquid inlet; The bottom of the gas separation device is provided with a sewage outlet, and the top of the gas separation device is provided with an exhaust port.

2. The gas separation device according to claim 1, characterized in that: The top of the gas-liquid separation chamber is provided with a condensing element and a liquid catching element in sequence from low to high.

3. The gas separation device according to claim 1 or 2, characterized in that: A liquid outlet baffle is obliquely arranged in the liquid outlet chamber; One end of the liquid outlet baffle is connected to the side wall above the liquid outlet, and the other end extends to the bottom of the liquid outlet; Preferably, a liquid inlet baffle is obliquely arranged in the liquid inlet chamber; One end of the liquid inlet baffle is connected to the side wall above the liquid inlet, and the other end extends to the bottom of the liquid inlet.

4. The gas separation device according to any one of claims 1 to 3, characterized in that: The gas separation device is also provided with an external magnetic attraction member; The external magnetic attraction component is arranged outside the gas separation device and is located below the liquid inlet.

5. The gas separation device according to any one of claims 1 to 4, characterized in that: The volume of the liquid inlet chamber is greater than the volume of the liquid outlet chamber.

6. The gas separation device according to any one of claims 1 to 5, characterized in that: The gas separation device includes a liquid level measuring member; The liquid level measuring element is used to detect the liquid level height in the gas separation device.

7. The gas separation device according to any one of claims 1 to 6, characterized in that: The gas separation device is also provided with a differential pressure gauge interface; The differential pressure gauge interface is used to connect a differential pressure gauge.

8. A water electrolysis hydrogen production device system, characterized in that: The hydrogen separator and / or oxygen separator in the water electrolysis hydrogen production system is a gas separation device as described in any one of claims 1-7.

9. The water electrolysis hydrogen production device system according to claim 8, characterized in that: The water electrolysis hydrogen production device system comprises an electrolyzer, a hydrogen separator, an oxygen separator and a post-processing unit; The post-processing unit includes a cooling device and a filtering device connected in sequence; The two discharge ports of the electrolyzer are respectively connected to the liquid inlets of the hydrogen separator and the oxygen separator through pipelines; The liquid outlets of the hydrogen separator and the oxygen separator are connected to the feed inlet of the cooling device; The discharge port of the filtering device is connected to the feed port of the electrolytic cell.

10. An application of the water electrolysis hydrogen production device system as claimed in claim 8 or 9, characterized in that: During the process of producing hydrogen by electrolyzing water, the hydrogen separator and / or oxygen separator is used to remove suspended iron in the electrolyzed water.

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