Electrolyte circulation bubble treatment device, gas-liquid separation equipment and application

Abstract

The invention discloses an electrolyte circulation bubble treatment device which comprises a separation and dehumidification tank body, a gas outlet formed in the bottom of the separation and dehumidification tank body, a liquid outlet formed in the bottom of the separation and dehumidification tank body, and an inlet formed in the wall of the tank body, and further comprises a bubble treatment device installed on the lower portion in the separation and dehumidification tank body. The bubble processing device comprises a filter element used for blocking bubbles, the bubbles flow outside the filter element and are combined into large bubbles to float upwards, and pressure difference exists between the front side and the rear side of the filter element and drives electrolyte to penetrate through. According to the bubble treatment device, tiny bubbles are blocked outside the filter element, reasonable filter particle size and structural design of the bubble filter is carried out, and the pressure difference between the front side and the rear side of the filter element is utilized to drive electrolyte to pass through, so that on one hand, the filter element can effectively block the bubbles, and on the other hand, turbulent flow generated by flowing of an electrolytic bath outside the filter element; the bubbles blocked outside the filter element flow randomly outside the filter element, collide with each other and are combined to form large bubbles, and the large bubbles float to the air cavity, so that the separation and treatment of the bubbles in the electrolyte are completed.

Description

Technical Field

[0001] The invention relates to the technical field of hydrogen production by electrolysis of water, and in particular to an electrolyte circulation bubble processing device, a gas-liquid separation device and applications. Background Art

[0002] Typical technologies for hydrogen production by water electrolysis include alkaline water electrolysis, proton exchange membrane electrolysis, anion exchange membrane electrolysis, and high-temperature solid oxide electrolysis. Among them, alkaline water electrolysis is the most mature and most commonly used green hydrogen production method. During the electrolysis process, the gases produced by the anode and cathode cannot be mixed due to the obstruction of the membrane, and thus flow out from different outlets with the flow of the electrolyte and enter different gas-liquid separation devices. Generally, they exist in the form of micro bubbles in the gas-liquid separator, and the diameter of the micro bubbles is about 50-200 microns. Due to the high viscosity of the electrolyte, the micro bubbles rise slowly, the separation effect is poor, and the efficiency is low. Therefore, traditional gas-liquid separation equipment is large in size and high in cost.

[0003] At the same time, when the fine bubbles are not separated cleanly, they will flow back to the electrolyzer, causing the gas content in the electrolyte to be too high, the resistance to increase, and the electrolysis efficiency to decrease. In addition, the electrolyte separated by the hydrogen separator and the oxygen separator will mix in the electrolyzer, and the hydrogen and oxygen will mix, which will cause safety hazards to the electrolyzer, especially in the field of hydrogen production by electrolysis of water. The operation of hydrogen production by electrolysis of water is stable, and the gas moisture content is high, especially in high-power hydrogen production systems, and the hydrogen production is large. At present, the gas separation and dehumidification of electrolysis of water mainly adopts the combination of horizontal separators and heat exchangers. The overall system size is large, the dynamic performance is low, the start and stop and load change are slow, and it is difficult to couple with new energy sources such as wind and light.

[0004] However, the treatment of microbubbles in electrolytes often faces several technical challenges:

[0005] Since the gas generated by water electrolysis is separated from the electrode in the form of micro bubbles, the diameter of the micro bubbles is about 50-130 microns. When the bubbles enter the separator with the electrolyte, the diameter of the bubbles is too small, resulting in a slow rise of the micro bubbles, poor separation effect, and low efficiency. Therefore, traditional gas-liquid separation equipment is large in size and high in cost.

[0006] Since the diameter of bubbles in the electrolyte is very small and the viscosity of the electrolyte is high, the bubbles easily flow with the electrolyte. Traditional baffles, partitions, etc. are difficult to constrain the flow direction of all electrolytes and separate them along a predetermined path. Generally speaking, some electrolytes are not fully treated for bubble separation. If the treatment is not thorough or the effect is poor, it will affect the performance and operational safety of the electrolytic cell. Summary of the invention

[0007] The technical problem to be solved by the present invention is how to solve the problem that bubbles in the electrolyte are separated and not completely treated as they flow in the electrolytic cell.

[0008] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0009] A device for treating bubbles in electrolyte circulation comprises a separation and dehumidification tank body, a gas outlet is arranged at the bottom of the separation and dehumidification tank body, a liquid outlet is arranged at the bottom, an inlet is arranged on the tank body wall, and a bubble treating device is installed at the lower part of the separation and dehumidification tank body. The bubble treating device comprises a filter element for blocking bubbles, so that the bubbles flow outside the filter element and merge into large bubbles to float up. There is a pressure difference between the front and rear sides of the filter element and drives the electrolyte to pass through.

[0010] The present application installs a bubble treatment device in the separation and dehumidification tank to block tiny bubbles outside the filter element, performs reasonable bubble filter particle size and structural design, utilizes the pressure difference between the front and rear sides of the filter element and drives the electrolyte to pass through. On the one hand, the filter element can effectively block the bubbles, and on the other hand, the turbulence generated by the flow of the electrolytic cell outside the filter element causes the bubbles blocked outside the filter element to flow randomly outside the filter element, collide with each other and merge to form large bubbles, which float to the air cavity, thereby completing the separation and treatment of bubbles in the electrolyte.

[0011] As a further solution of the present invention: the pore diameter of the filter element is selected in the range of 0.1μm-1000μm, and the flow resistance of the filter element is designed to be lower than 200Kpa.

[0012] As a further solution of the present invention: the pore diameter of the filter element is smaller than the diameter of the electrolyte bubbles.

[0013] As a further solution of the present invention: the bubble pressure difference unbalanced force FG=PA=PπD^2 / 4(1);

[0014] The liquid tension on the bubble surface FL = ScosθL = ScosθπD (2);

[0015] The vector equation can be expressed as:

[0016] PπD^2 / 4=ScosθπD

[0017] Then the filter element pore diameter D = 4Scosθ / P(3);

[0018] Where P is the pressure difference on both sides of the filter element; A is the pore area of ​​the filter element; D is the pore diameter of the filter element; θ is the contact angle of the liquid relative to the pore wall; S is the surface tension of the liquid in contact with the gas; FG is the unbalanced force of the bubble pressure difference on both sides of the filter element; FL is the liquid tension on the surface of the bubble.

[0019] As a further solution of the present invention: the top of the filter element is connected to at least one exhaust pipe, and the top of the exhaust pipe is located above the liquid level of the electrolyte.

[0020] The present invention also discloses a gas-liquid separation device, comprising the electrolyte circulation bubble processing device, and also comprising a gas-liquid bubbling dehumidification component arranged in a separation dehumidification tank for gas cooling and dehumidification, wherein the gas-liquid bubbling dehumidification component is provided with at least two stages and is independent of each other, and the two stages of the gas-liquid bubbling dehumidification components are both located above the bubble processing device;

[0021] The gas-liquid mixture enters from the inlet, the gas rises and enters the gas-liquid bubbling dehumidification component, and the liquid descends and enters the bubble processing device.

[0022] As a further solution of the present invention: the two-stage gas-liquid bubbling dehumidification components both include a cooling heat exchange component and an air intake pipeline for air intake from the bottom. The gas-liquid bubbling dehumidification component is filled with dehumidification liquid, and the gas inside the dehumidification liquid is cooled and dehumidified by the cooling heat exchange component.

[0023] As a further solution of the present invention: an overflow pipe is provided in the gas-liquid bubbling dehumidification component, and the top horizontal plane of the overflow pipe is lower than the top horizontal plane of the air inlet pipeline;

[0024] The bottom of the overflow pipe in the gas-liquid bubbling dehumidification component located at the top extends into the next gas-liquid bubbling dehumidification component; the bottom of the overflow pipe in the gas-liquid bubbling dehumidification component located at the bottom extends into the bubble processing device.

[0025] As a further solution of the present invention: the cooling heat exchange component includes a cooling heat exchange coil, which is spirally arranged, and one end of the cooling heat exchange coil is connected to the coolant inlet located on the separation dehumidification tank body, and the other end of the cooling heat exchange coil is connected to the coolant outlet located on the separation dehumidification tank body.

[0026] The invention also discloses the application of an electrolyte circulation bubble treatment device in the process of producing hydrogen by electrolyzing water.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. The present application filters the bubbles in the electrolyte by means of a filter element filtration method. By utilizing the liquid tension on the bubble surface, the bubbles can be kept intact within a suitable range of working conditions, and the bubbles can be blocked to prevent them from being carried through the filter element by the electrolyte. At the same time, the flow of electrolyte outside the filter element is utilized to form a turbulent flow, so that the blocked bubbles are randomly collided and merged into large bubbles, and then float up and separate;

[0029] 2. The present application has a higher separation efficiency. Since the diameter of bubbles in the electrolyte is very small and the viscosity of the electrolyte is high, bubbles easily flow with the electrolyte. This invention can force bubble separation treatment on all circulating electrolytes by matching the appropriate filter element design and constraining the electrolyte circulation path, and the bubble treatment and separation effect is better.

[0030] 3. This application is of great significance for the research and development and performance verification of hydrogen production by water electrolysis, especially electrolyte hydrogen production stacks. The device needs to overcome the problems of large size and slow dynamic response of traditional separators, and solve the problem of incomplete separation and treatment of bubbles in the electrolyte when they flow with the electrolytic cell;

[0031] 4. This application solves the shortcomings of the existing technology, such as large separation unit volume, low dynamic performance, and narrow operating range, and achieves comprehensive technical improvement through the filter-type bubble separation device, which brings significant benefits to the development and testing of water electrolysis hydrogen production system;

[0032] 5. The present application integrates the gas-liquid bubbling dehumidification component and the bubble processing device in the separation dehumidification tank, and realizes the separation of liquid in gas and gas in liquid at the same time, so that the liquid at the separation point falls into the bubble processing device, and the separated gas enters the gas-liquid bubbling dehumidification component. The integrated design integrates gas-liquid separation, dehumidification separation and bubble separation, reduces the equipment volume and improves the integration degree;

[0033] 6. The present application adopts a multi-stage gas-liquid bubbling dehumidification component to mix the gas to be treated with the dehumidification liquid, and uses a cooling heat exchange component to reduce the gas temperature to a temperature close to that of the dehumidification liquid. The temperature difference design of each stage of dehumidification and heat exchange has better dehumidification efficiency. The first stage uses a large temperature difference to complete large load dehumidification, and the second stage uses a large heat exchange area to achieve a lower dehumidification temperature, thereby achieving better gas dehumidification efficiency and dehumidification effect. The device uses the principle of multi-stage bubbling dehumidification to perform efficient dehumidification in high temperature and low temperature sections respectively, and is suitable for occasions requiring high-precision dehumidification, such as the separation and dehumidification of anode and cathode gases in the process of hydrogen production by electrolysis of water. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic structural diagram of the bubble treatment device in Example 1 of the present invention when placed vertically;

[0035] Figure 2 This is the electrolyte circulation bubble treatment device of Example 1 of the present invention;

[0036] Figure 3 This is a schematic structural diagram of the bubble treatment device of Example 2 of the present invention when placed horizontally;

[0037] Figure 4 This is a schematic diagram of the integration of a vertical bubble treatment device and a gas-liquid bubbling dehumidification component in Example 3 of the present invention;

[0038] Figure 5 This is a schematic diagram of the structure of the gas-liquid bubbling dehumidification component of Example 3 of the present invention;

[0039] Figure 6This is a schematic diagram of the integration of a horizontal bubble treatment device and a gas-liquid bubbling dehumidification component in Example 4 of the present invention;

[0040] Description of reference numerals:

[0041] 1. Inlet; 2. Gas outlet; 3. Liquid outlet; 4. Separation and dehumidification tank; 5. Liquid level sensor; 6. Water supply port; 7. Gas-liquid combing device; 8. Droplet capture device;

[0042] 900, bubble treatment device; 901, exhaust pipe; 902, filter element;

[0043] 200, gas-liquid bubbling dehumidification component; 201, partition; 202, air inlet pipe; 203, air guide pipe; 204, gas distribution plate; 205, cooling heat exchange coil; 206, coolant inlet; 207, coolant outlet; 208, overflow pipe. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] Example 1

[0046] Reference Figure 1 , an electrolyte circulation bubble treatment device, includes a separation dehumidification tank body 4 and a bubble treatment device 900 installed at the inner bottom of the separation dehumidification tank body 4, a gas outlet 2 is opened at the top of the separation dehumidification tank body 4, a liquid outlet 3 is opened at the bottom of the separation dehumidification tank body 4, and an inlet 1 is opened at a lower position of a side wall of the separation dehumidification tank body 4, wherein the bubble treatment device 900 is located below the inlet 1 and above the liquid outlet 3; a liquid level sensor 5 is also provided at a lower position of the separation dehumidification tank body 4.

[0047] Furthermore, a gas-liquid combing device 7 is added inside the separation and dehumidification tank body 4 and on one side of the inlet 1. The gas-liquid combing device 7 can reduce the impact of the gas-liquid mixture at the inlet 1, change the flow direction of the gas-liquid mixture, and evacuate the gas and liquid to make it easier for the droplets to settle. The gas-liquid combing device 7 of this embodiment can adopt various methods such as a distribution plate, a corrugated packing, a baffle, etc., which are not limited in this application.

[0048] Furthermore, a droplet catching device 8 is added to the top of the inner side of the separation and dehumidification tank 4 and below the gas outlet 2, wherein the droplet catching device 8 can further separate the tiny droplets entrained in the gas after filtering and bubbling dehumidification. After the gas flow is processed by the droplet catching device 8, it is discharged from the separator gas outlet 2; the droplet catching device 8 of this embodiment can be made of materials such as a wire mesh demister, a filler, and a polymer filter element, which is not limited in this application.

[0049] The electrolyte circulating liquid containing bubbles enters the separation dehumidification tank body 4 from the circulating liquid inlet 1 of the separation device. Under the action of gravity and inertia, the circulating liquid flows downward into the liquid storage tank at the bottom of the separation dehumidification tank body 4. In this process, tiny bubbles in the electrolyte will also fall into the liquid storage tank. Since the bubble particle size is very small and the circulating liquid has a certain viscosity, the tiny bubbles float up very slowly. The tiny bubbles flow along the electrolyte circulation path.

[0050] Reference Figure 1 and Figure 2 The bubble treatment device 900 includes a filter element 902 for blocking bubbles, so that the bubbles flow outside the filter element 902 and merge into large bubbles to float up. There is a pressure difference between the front and rear sides of the filter element 902 and drives the electrolyte to pass through. The preferred filter element 902 filter particle size range generally ranges from 0.1-1000um, and the filter element flow resistance is designed to be less than 200Kpa. It should be noted that the filter particle size range here is mainly based on the actual operating conditions. The specific needs are determined in combination with the bubble diameter, electrolyte medium, and electrolyte circulation flow rate to determine the filter element size, filter element surface contact angle, etc. This application does not limit it.

[0051] The preferred filter element 902 can be a sintered filter element, a non-metallic coalescing filter element, a non-metallic microporous filter element, a metal mesh filter element, a pleated filter element, etc. This application does not limit this and only gives a few implementation methods.

[0052] Specifically, the filter element is designed according to the bubble particle size distribution in the electrolyte; since the pore diameter of the filter element is reduced, the bubble can be better blocked; but too low a pore size of the filter element will reduce the porosity of the filter element, resulting in an increase in flow resistance, such as Figure 2 As shown in the figure, when the pressure difference on both sides of the filter element 902 is too large and FG (bubble pressure imbalance force) is greater than FL (liquid tension on the bubble surface), the bubbles will pass through the filter element 902 and enter the other side under the pressure difference, resulting in the failure of bubble barrier. Therefore, it is necessary to design a reasonable filter element pore diameter. The specific calculation is as follows:

[0053] Bubble pressure difference unbalance force FG=PA=PπD^2 / 4(1);

[0054] The liquid tension on the bubble surface is FL = ScosθL = ScosθπD (2);

[0055] The vector equation can be expressed as:

[0056] PπD^2 / 4=ScosθπD;

[0057] Therefore, the pore diameter of the filter element (902) is D = 4Scosθ / P(3);

[0058] Among them, P is the pressure difference on both sides of the filter element; A is the filter element pore area; D is the filter element pore diameter; θ is the contact angle of the liquid relative to the pore wall; S is the surface tension of the liquid in contact with the gas; FG is the pressure difference imbalance force of the bubbles on both sides of the filter element; FL is the liquid tension on the surface of the bubble. The filter element with large area, high porosity and low contact angle is preferred to better perform bubble isolation treatment.

[0059] Furthermore, the filter element 902 is designed to be on the circulation path of the circulating liquid, so that the circulating liquid containing microbubbles flows through the filter element 902, and the pressure difference before and after the filter element 902 drives the liquid to pass through the pores of the filter element. The pores of the filter element 902 are smaller than the diameter of the bubbles of the electrolytic circulating liquid, and due to the liquid tension on the surface of the bubbles, the microbubbles will not pass through the filter element within a certain pressure difference range (that is, FG is less than FL), and thus the microbubbles are blocked outside the filter element.

[0060] Furthermore, the bubbles blocked by the filter element flow with the electrolyte outside the filter element 902, and the bubbles collide with each other and merge to gradually grow larger. When the bubbles merge to a large enough size, the buoyancy of the bubbles increases, and the upward flow rate of the bubbles is greater than the downward flow rate of the circulating liquid. The bubbles float from the external accessories of the filter element to the liquid surface, break away from the liquid surface, enter the separator air cavity, and can finally be discharged from the gas outlet 2 of the separation device along with the air flow.

[0061] Reference Figure 1 and Figure 2 , because the electrolytic circulating liquid and the bubbles are evenly mixed, the gas is in a saturated dissolved state in the electrolyte; according to Henry's law, the gas solubility is positively correlated with pressure and negatively correlated with temperature, and the solubility at high pressure is higher than that at low pressure. On the one hand, due to the electrolyte flow resistance; the pressure before the filter element is greater than the pressure after the filter. Therefore, after the electrolyte passes through the filter element, due to the pressure change, a small amount of bubbles are precipitated; on the other hand, for some applications with changing operating pressures, such as electrolysis of water to produce hydrogen, when the pressure or temperature changes, there is a possibility of gas precipitation; the bubbles precipitated from the filtered liquid also rise due to buoyancy and gather in the top area of ​​the filter element; when the bubbles gather to a certain extent, they are discharged from the exhaust pipe 901. Avoid long-term operation with a large number of bubbles gathering at the bottom of the filter element.

[0062] It should be noted that the exhaust pipe 901 can be provided in a single piece or in a plurality of pieces, wherein the exhaust pipe 901 is connected to the top of the filter element 902, and the top of the exhaust pipe 901 is located above the liquid level of the electrolyte.

[0063] Example 2

[0064] Reference Figure 3 The rest is the same as in Example 1, except that the separation dehumidification tank body 4 of this Example 2 is placed horizontally, while the separation dehumidification tank body 4 in Example 1 is placed vertically; its working process is the same as that of Example 1, and this example will not be described in detail.

[0065] Example 3

[0066] Reference Figure 4 This embodiment 3 discloses a gas-liquid separation device, which integrates electrolyte bubble separation and electrolytic gas dehumidification separation functions, and both functions are integrated in the separation and dehumidification tank 4; on the basis of embodiment 1, a two-stage gas-liquid bubbling dehumidification component 200 is added, wherein the two-stage gas-liquid bubbling dehumidification component 200 is located directly above the bubble treatment device 900, and the two-stage gas-liquid bubbling dehumidification component 200 is located above the inlet 1.

[0067] The overall principle is as follows: the gas-liquid mixture to be treated can enter the separation dehumidification tank body 4 from the inlet 1. After gravity separation, most of the liquid drips and settles to the bubble treatment device 900 at the bottom of the separation dehumidification tank body 4. Under the action of the bubble treatment device 900, the electrolyte settled here is separated from the internal gas, and the separated gas can rise to the separation dehumidification component 200; and the initially separated high-temperature and high-humidity gas entrains some droplets and enters the two-stage separation dehumidification component 200 for water washing, cooling and dehumidification. The gas rising here can be separated from the internal liquid, and the separated liquid can fall into the bubble treatment device 900; and the gas after dehumidification and separation by the two-stage separation dehumidification component 200 is finally discharged from the gas outlet 2, and the liquid separated by the bubble treatment device 900 is discharged from the liquid outlet 3.

[0068] Reference Figure 4 The two-stage gas-liquid bubbling dehumidification components 200 are arranged in two groups in this application, but are not limited to two groups. It depends on the actual situation. This application only gives one preferred implementation mode; the gas-liquid bubbling dehumidification components 200 are used for gas dehumidification and are installed inside the separator 4. Each stage of the gas-liquid bubbling dehumidification components 200 are independent of each other; there is a certain distance between the two.

[0069] Furthermore, the two-stage gas-liquid bubbling dehumidification assembly 200 has the same structure, and the present application takes one of the first-stage gas-liquid bubbling dehumidification assembly 200 as an example for description:

[0070] Reference Figure 5The gas-liquid bubbling dehumidification component 200 includes a partition 201, an air inlet pipe 202, an air guide pipe 203, a gas distribution plate 204, a cooling heat exchange coil 205, a coolant inlet 206, a coolant outlet 207 and an overflow pipe 208, wherein the partition 201 is placed at the bottom, the outer side of the partition 201 is fixed to the inner wall of the separation dehumidification tank 4, and a hole is opened in the middle of the partition 201 for connecting the air inlet pipe 202. The air inlet pipe 202 is installed vertically, and the outer side of the air inlet pipe 202 surrounds the inlet The air pipe 202 is installed with an air guide pipe 203, wherein the middle position of the air guide pipe 203 bulges upward, the air intake pipe 202 is located inside the bulge, and the top of the air intake pipe 202 is connected to the air guide pipe 203; and both ends of the air guide pipe 203 are opened and connected to the gas distribution plate 204, so that the gas can enter from the air intake pipe 202, and then enter from the top of the air intake pipe 202 to the top of the inner side of the air guide pipe 203, and then flow downward from the air guide pipe 203, and finally be discharged from the gas distribution plate 204.

[0071] Dehumidification liquid is filled in the gas-liquid bubbling dehumidification component 200 and located above the partition 201. The dehumidification liquid can be water; the cooling heat exchange coil 205 is arranged in a winding manner on the outside of the air inlet pipe 202 and the air duct 203, so that the gas can be cooled to a certain extent when it is inside the air inlet pipe 202 and the air duct 203; one end of the cooling heat exchange coil 205 is connected to the cooling liquid inlet 206 provided on the separation dehumidification tank body 4, and the other end of the cooling heat exchange coil 205 is connected to the cooling liquid outlet 207 provided on the separation dehumidification tank body 4. Low-temperature (0-25°C) external cooling water enters the cooling coil 205 from the separation component cooling liquid inlet 206, flows from top to bottom, and is discharged from the cooling liquid outlet 207. In this process, the dehumidification liquid in the gas-liquid bubbling dehumidification component 200 and the high-temperature and high-humidity gas with some droplets entering can be cooled.

[0072] Furthermore, the overflow pipe 208 is installed on one side of the air guide pipe 203, wherein the top horizontal plane of the overflow pipe 208 is lower than the top horizontal plane of the air guide pipe 203, and the bottom of the overflow pipe 208 extends into the inner bottom of the separation dehumidification tank body 4 or the next-stage gas-liquid bubbling dehumidification component 200; specifically, the bottom of the overflow pipe 208 in the uppermost gas-liquid bubbling dehumidification component 200 extends into the next gas-liquid bubbling dehumidification component 200; the bottom of the overflow pipe 208 in the lowermost gas-liquid bubbling dehumidification component 200 extends into the separation dehumidification tank body 4. at the bottom; therefore, the high-temperature and high-humidity gas containing some liquid droplets is discharged from the gas distribution plate 204 and mixed with the dehumidified liquid. At this time, the cooling heat exchange coil 205 cools down the dehumidified liquid and gas mixture. Since the moisture content of the gas is highly correlated with the temperature, the moisture content is high at high temperatures and low at low temperatures. Therefore, after some of the liquid droplets in the gas are mixed with the dehumidified liquid, the dehumidified liquid level will rise. When it reaches the overflow position of the overflow pipe 208, it will flow out from the overflow pipe 208 to the inner bottom of the separation dehumidification tank 4 or the next-stage gas-liquid bubbling dehumidification component 200.

[0073] The gas to be treated enters from the lower part of the air inlet pipe 202, flows to the upper part of the air inlet pipe 202, and then goes down to the bottom gas distribution chamber on the outer wall of the air inlet pipe 202 and the internal space of the air guide pipe 203, and flows out after being evenly distributed by the gas distribution plate 204. The outflowing gas stream contacts the dehumidification liquid (or cooling water) in the gas-liquid bubbling dehumidification component 200, and performs a water washing bubbling reaction. By reasonably designing the bubbling area, bubbling flow rate, and bubbling liquid level height, the gas is cooled to a temperature close to that of the water washing bubbling liquid. The cooling coil 205 is immersed in the bubbling dehumidification liquid to cool the dehumidification liquid. The overflow pipe 208 is used to overflow the condensed liquid in the gas to the upper level, and finally to the liquid storage chamber of the bubble treatment device 900 at the bottom of the separation dehumidification tank body 4. A liquid level sensor 5 is provided at the lower position of the separation dehumidification tank body 4 for liquid level monitoring or control. A liquid replenishment port 6 is provided on the separation dehumidification tank body 4 and on one side of the uppermost gas-liquid bubbling dehumidification component 200, through which liquid replenishment can be performed during initial operation or when liquid replenishment is required.

[0074] The overflow port height of the overflow pipe 208 is designed near the coil, and most of the coil is immersed in the liquid for sufficient heat exchange. When the liquid level is higher than the overflow pipe 208, the condensed liquid flows downward from the overflow pipe 208 to ensure the stability of the liquid level. The top of the air inlet pipe 202 is set higher than the liquid level to avoid liquid backflow after shutdown. The air guide pipe 203 is higher than the air inlet pipe 202 to ensure that there is enough space for gas to flow between the two.

[0075] It should be noted that the bubbling area, bubbling flow rate, and bubbling liquid level are determined by the plate hole diameter, opening rate, and distribution plate hole arrangement of the gas distribution plate 204. It is necessary to design a reasonable gas flow rate in combination with the actual working conditions involved, adjust the size of the bubbling bubbles, and make the air flow flow out in a uniform small bubble manner to fully exchange heat with the dehumidification water. Smaller bubbles have a larger mass transfer and heat transfer area, and a higher effect; the gas content of the bubbling dehumidification liquid is evaluated by parameters such as gas flow rate and bubble diameter, and the bubbling liquid level is reasonably designed to ensure that each level of gas can be fully dehumidified; the specific design is based on the actual situation, and this application does not limit it.

[0076] The multi-stage bubbling water washing dehumidification design is adopted. The temperature difference design of the two poles is calculated by comprehensive evaluation, rather than simply superimposing the number of stages or the size of the dehumidification unit, so as to have better dehumidification efficiency. Utilizing the relationship between the moisture content of saturated gas and temperature, under the same pressure, the moisture content is large at high temperature and low at low temperature, and the main dehumidification heat load is concentrated in the high temperature section; after the temperature drops, the saturated moisture content of the gas drops significantly, and the dehumidification heat exchange load in the low temperature section is small. Therefore, using this characteristic to adopt multi-stage bubbling dehumidification has higher efficiency. The first stage uses the large temperature difference between the cooling water inside the coil and the external dehumidification liquid to complete a higher dehumidification load in a limited area. The second stage has a small temperature difference, but the dehumidification load is low. Through reasonable heat transfer area design, a lower dehumidification temperature can be achieved. For example, at 1Mpa, the first stage is reduced from 90℃ to 60℃, and the second stage is reduced from 60℃ to 20℃. The enthalpy values ​​of the two working conditions change greatly, and the dehumidification load of the first stage is about 4 times that of the second stage.

[0077] The water washing bubbling dehumidification method is adopted, and the gas and liquid are fully mixed for mass transfer and heat transfer, which is highly efficient. The gas temperature after dehumidification is basically consistent with the dehumidification water temperature. The first stage water washing is at a relatively medium and high temperature of 50-90°C by adopting a graded method, which has a large temperature difference with the cooling liquid in the coil 205, so that a large load of heat exchange can be completed with a small heat exchange area. After the dehumidified gas enters the second stage, the water washing dehumidification temperature is designed to be 10-30°C, which improves the final dehumidification effect and makes the water content of the dehumidified gas lower. Since the temperature difference between the bubbling water washing water temperature and the cooling liquid in the coil 205 is small. Therefore, the second stage is designed to reduce the gas temperature from 50-90°C to 10-30°C. Compared with the first stage high temperature section, the dehumidification heat exchange load is smaller, so there is no need for a lot of heat exchange coils to increase the heat exchange area.

[0078] Example 4

[0079] Reference Figure 6 , the rest is the same as Example 3, the difference is that the separation dehumidification tank body 4 is designed to be placed horizontally (i.e. the installation method in Example 2), and Example 4 also integrates the electrolyte bubble separation and electrolytic gas dehumidification separation functions, and both functions are integrated in the separation dehumidification tank body 4; its working process is the same as that of Example 3, and this embodiment will not be repeated in detail.

[0080] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An electrolyte circulation bubble treatment device, comprising a separation dehumidification tank body (4), a gas outlet (2) is arranged at the bottom of the separation dehumidification tank body (4), a liquid outlet (3) is arranged at the bottom, and an inlet (1) is arranged on the tank body wall, characterized in that: It also includes a bubble processing device (900) installed at the lower part of the separation and dehumidification tank body (4), wherein the bubble processing device (900) includes a filter element (902) for blocking bubbles, so that the bubbles flow outside the filter element (902) and merge into large bubbles to float upward, and there is a pressure difference between the front and rear sides of the filter element (902) to drive the electrolyte to pass through.

2. The electrolyte circulation bubble treatment device according to claim 1, characterized in that: The pore diameter of the filter element (902) is selected in the range of 0.1 μm-1000 μm, and the flow resistance of the filter element is designed to be lower than 200 Kpa.

3. The electrolyte circulation bubble treatment device according to claim 1, characterized in that: The pore diameter of the filter element (902) is smaller than the diameter of the electrolyte bubbles.

4. The electrolyte circulation bubble treatment device according to claim 2, characterized in that: Bubble pressure difference unbalance force FG=PA=PπD^2 / 4(1); The liquid tension on the bubble surface is FL = ScosθL = ScosθπD (2); The vector equation can be expressed as: PπD^2 / 4=ScosθπD; Then the pore diameter of the filter element (902) D = 4Scosθ / P(3); Where P is the pressure difference on both sides of the filter element; A is the pore area of ​​the filter element; D is the pore diameter of the filter element; θ is the contact angle of the liquid relative to the pore wall; S is the surface tension of the liquid in contact with the gas; FG is the unbalanced force of the bubble pressure difference on both sides of the filter element; FL is the liquid tension on the surface of the bubble.

5. The electrolyte circulation bubble treatment device according to claim 1, characterized in that: The top of the filter element (902) is connected to at least one exhaust pipe (901), and the top of the exhaust pipe (901) is located above the liquid level of the electrolyte.

6. A gas-liquid separation device, characterized in that: The invention comprises an electrolyte circulation bubble treatment device according to any one of claims 1 to 5, and further comprises a gas-liquid bubbling dehumidification component (200) arranged in a separation dehumidification tank (4) for gas cooling and dehumidification, wherein the gas-liquid bubbling dehumidification component (200) is provided with at least two stages and is independent of each other, and the two stages of the gas-liquid bubbling dehumidification components (200) are both located above the bubble treatment device (900); The gas-liquid mixture enters from the inlet (1), the gas rises and enters the gas-liquid bubbling dehumidification component (200), and the liquid descends and enters the bubble processing device (900).

7. A gas-liquid separation device according to claim 6, characterized in that: The two-stage gas-liquid bubbling dehumidification components (200) both include a cooling heat exchange component and an air intake pipeline for taking air from the bottom. The gas-liquid bubbling dehumidification component (200) is filled with dehumidification liquid, and the gas inside the dehumidification liquid is cooled and dehumidified by the cooling heat exchange component.

8. A gas-liquid separation device according to claim 7, characterized in that: An overflow pipe (208) is provided in the gas-liquid bubbling dehumidification component (200), and the top horizontal plane of the overflow pipe (208) is lower than the top horizontal plane of the air inlet pipeline; The bottom of the overflow pipe (208) in the gas-liquid bubbling dehumidification component (200) located at the top extends into the next gas-liquid bubbling dehumidification component (200); the bottom of the overflow pipe (208) in the gas-liquid bubbling dehumidification component (200) located at the bottom extends into the bubble processing device (900).

9. The gas-liquid separation device according to claim 7, characterized in that: The cooling heat exchange component comprises a cooling heat exchange coil (205), wherein the cooling heat exchange coil (205) is arranged in a spiral manner, and one end of the cooling heat exchange coil (205) is connected to a cooling liquid inlet (206) located on the separation dehumidification tank body (4), and the other end of the cooling heat exchange coil (205) is connected to a cooling liquid outlet (207) located on the separation dehumidification tank body (4).

10. Use of the electrolyte circulation bubble treatment device as described in any one of claims 1 to 5 in a process of producing hydrogen by electrolysis of water.

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