Multistage high-efficiency bubble dehumidification separation device, dehumidification separation method and application

Abstract

The application discloses a kind of multistage high-efficiency bubble dehumidification separation devices, including separation dehumidification tank body, and the inside of separation dehumidification tank body and located above the import is provided with at least two levels of independent gas-liquid bubble dehumidification component;Two-stage gas-liquid bubble dehumidification component includes cooling heat exchange component and gas inlet pipeline from bottom air inlet, gas-liquid bubble dehumidification component is filled with dehumidification liquid, and the gas in dehumidification liquid is cooled and dehumidified by cooling heat exchange component.Multiple gas bubble dehumidification components, can be mixed with dehumidification liquid to be processed gas, and utilize cooling heat exchange component to reduce gas temperature to be close to consistent with dehumidification liquid temperature, by the temperature difference design of each level dehumidification heat exchange, with better dehumidification efficiency, by multistage bubble dehumidification principle, can carry out efficient dehumidification in high temperature section and low temperature section respectively, suitable for the occasion needing high-precision dehumidification, such as electrolytic water hydrogen production process anode and cathode gas separation and dehumidification treatment.

Description

Technical Field

[0001] The present invention relates to the technical field of gas dehumidification, and in particular to a multi-stage high-efficiency bubbling dehumidification separation device, a dehumidification separation method and applications. Background Art

[0002] Gas dehumidification is an essential component of many industrial processes, particularly in hydrogen production from water electrolysis, where the dehumidification of both hydrogen and oxygen is crucial. Existing dehumidification technologies often face challenges with high energy consumption, bulky equipment, and high maintenance costs when handling high-humidity gases. Traditional single-stage dehumidification solutions are not only inefficient but also occupy large spaces, making them difficult to meet the demands of modern industrial production. Furthermore, traditional single-stage dehumidification devices struggle to achieve efficient dehumidification when handling highly dynamic operating conditions.

[0003] Currently, hydrogen production from water electrolysis boasts high operational stability and high gas moisture content, particularly in high-power hydrogen production systems, which produce large amounts of hydrogen. However, current dehumidification of gas from water electrolysis primarily utilizes a combination of horizontal separators and heat exchangers. This results in large overall system size, poor dynamic performance, slow startup and shutdown, and load changes, making it difficult to integrate with renewable energy sources such as wind and solar power.

[0004] Therefore, gas separation and dehumidification technologies often face several technical challenges:

[0005] 1. Traditional heat exchangers have poor adaptability to varying operating conditions for dehumidification. This is particularly true for hydrogen production from water electrolysis, which operates over a wide range of conditions. Under low operating conditions, the gas flows unevenly and slowly within traditional heat exchangers, resulting in low mass and heat transfer efficiency. Partially too low a flow rate makes it difficult to remove the condensed liquid film on the heat exchanger surface, forming a liquid film barrier that further impairs mass and heat transfer.

[0006] 2. Traditional heat exchangers have poor dehumidification shock resistance, especially in applications involving variable loads such as water electrolysis for hydrogen production. Gas production fluctuates significantly during these load changes, leading to rapid changes in the dehumidification load. Due to the indirect heat transfer principle of traditional heat exchangers, temperature differences exist between the cold and hot sides, making it difficult to maintain stable dehumidification performance during these rapid changes.

[0007] 3. Single-stage gas dehumidification has low efficiency, large dehumidification unit size, and large system volume, making it difficult to perform highly dynamic operating condition adjustments.

[0008] In view of this, the development of a multi-stage gas bubbling dehumidification separation device is of great significance for the research and development and performance verification of hydrogen production by water electrolysis, especially electrolyte hydrogen production. Summary of the Invention

[0009] The technical problem to be solved by the present invention is how to overcome the problem of low dehumidification and heat exchange efficiency of traditional heat exchangers.

[0010] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0011] A multi-stage high-efficiency bubbling dehumidification separation device comprises a separation dehumidification tank body, wherein the side wall of the separation dehumidification tank body is provided with an inlet, and the top and bottom of the separation dehumidification tank body are respectively provided with a gas outlet and a liquid outlet;

[0012] At least two stages of mutually independent gas-liquid bubbling dehumidification components are arranged inside the separation dehumidification tank and above the inlet; the two stages of the gas-liquid bubbling dehumidification components include a cooling heat exchange component and an air intake pipe that intakes air from the bottom, and 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;

[0013] Arranged from bottom to top, the gas temperature decreases step by step after dehumidification by each stage of gas-liquid bubbling dehumidification components.

[0014] The present application adopts a multi-stage gas 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. Through the temperature difference design of each stage of dehumidification and heat exchange, it 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 multi-stage bubbling dehumidification principle 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.

[0015] As a further solution of the present invention: the several levels of gas-liquid bubbling dehumidification components are not simply superimposed levels. The gas-liquid bubbling dehumidification components located in the first few levels at the bottom use a large temperature difference to complete high-load dehumidification, and the gas-liquid bubbling dehumidification components located in the last few levels at the top use a large heat exchange area to achieve a low dehumidification temperature.

[0016] As a further solution of the present invention: the gas-liquid bubbling dehumidification component includes an air inlet pipeline, wherein the middle of the air inlet pipeline bulges upward, and the cooling and heat exchange component is arranged in a winding manner on the outside of the bulge; air outlets are opened at the horizontal positions at both ends of the air inlet pipeline, and the air outlet direction of the air outlet is toward the cooling and heat exchange component.

[0017] As a further solution of the present invention: an overflow pipe is further 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;

[0018] The overflow pipe in each level of gas-liquid bubbling dehumidification assembly from bottom to top can overflow the condensate above the liquid level after dehumidification into the next level of gas-liquid bubbling dehumidification assembly, while the overflow pipe in the first level of gas-liquid bubbling dehumidification assembly can overflow the condensate above the liquid level to the bottom of the separation dehumidification tank.

[0019] As a further solution of the present invention: the air intake pipeline includes an air intake pipe and an air guide pipe, wherein the middle position of the air guide pipe protrudes upward, the air intake pipe is installed inside the protrusion, and the top of the air intake pipe is connected to the air guide pipe.

[0020] As a further solution of the present invention: a droplet catching device is provided on the inner top of the separation and dehumidification tank body and below the gas outlet.

[0021] 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.

[0022] As a further solution of the present invention: a bubble processing device is provided at the inner bottom of the separation and dehumidification tank body and above the liquid outlet.

[0023] The present invention also discloses a dehumidification and separation method of a multi-stage high-efficiency bubbling dehumidification and separation device, comprising the following steps:

[0024] The gas to be treated enters the separation and dehumidification tank from the inlet;

[0025] After gravity separation, some of the liquid droplets in the gas settle to the bottom of the separation and dehumidification tank, and the gas rises into the separation and dehumidification component below;

[0026] The inflowing airflow contacts the bubbling water washing liquid in the separation and dehumidification component, undergoes water washing and bubbling treatment, and cools the gas to a temperature close to that of the water washing and bubbling liquid, thus achieving cooling and dehumidification;

[0027] The treated gas enters the separation and dehumidification component above for the same water washing and bubbling treatment, achieving two-stage cooling and dehumidification;

[0028] Finally, the gas separated by bubbling dehumidification is discharged from the gas outlet, and the liquid separated is discharged from the liquid outlet.

[0029] The invention also discloses the application of a multi-stage high-efficiency bubbling dehumidification separation device in the process of producing hydrogen by electrolysis of water.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1. This application utilizes a multi-stage gas bubbling dehumidification component to mix the gas to be treated with the dehumidifying liquid, and utilizes a cooling heat exchange component to reduce the gas temperature to a temperature close to that of the dehumidifying liquid. The temperature difference design of each stage of dehumidification and heat exchange achieves better dehumidification efficiency. The first stage utilizes a large temperature difference to complete heavy-load dehumidification, while the second stage utilizes a large heat exchange area to achieve a lower dehumidification temperature, thereby achieving better gas dehumidification efficiency and dehumidification effect. The device utilizes the principle of multi-stage bubbling dehumidification to achieve efficient dehumidification in both high-temperature and low-temperature sections, making it suitable for applications requiring high-precision dehumidification, such as cation-gas separation and dehumidification in the process of hydrogen production by water electrolysis.

[0032] 2. The multi-stage separation dehumidification unit of this application is arranged sequentially from bottom to top. The gas temperature decreases step by step after each dehumidification stage. Through the special design of the air inlet pipe and overflow pipe, the treated gas is dehumidified in sequence upward, and the dehumidified condensed liquid flows downward and enters the liquid storage tank at the bottom. The integrated design combines gas-liquid separation and dehumidification separation, reducing the equipment volume and improving the integration level.

[0033] 3. This application has a wider range of operating conditions: it uses a bubbling water-washing dehumidification method, allowing high-temperature and high-humidity gas to directly contact the bubbling water-washing liquid. Through reasonable design of gas distribution, bubbling liquid level, bubbling flow rate, liquid gas entrainment rate, mass transfer and heat transfer coefficient, the airflow and liquid have sufficient mass and heat transfer area for sufficient mass and heat exchange. At the same time, the advantage of gas bubbling in the liquid is that the gas can be fully and vigorously mixed with the liquid in both high and low operating conditions (1-150%), avoiding the defects of traditional heat exchangers in low operating conditions such as uneven gas flow and low heat transfer efficiency. Therefore, it can adapt to a wider range of operating conditions.

[0034] 4. This application has a higher ability to withstand variable loads: it uses a bubbling water washing dehumidification method, allowing high-temperature and high-humidity gas to directly contact the bubbling water washing liquid. Utilizing the close temperature of the bubbling dehumidification gas and the large thermal melt of the bubbling dehumidification water, it is equivalent to having a very large low-temperature thermal melt. This can adapt to the impact of highly dynamic working conditions and maintain a consistent water washing temperature. Traditional heat exchanger cooling methods have a temperature difference between the cold side and the hot side. When the working conditions increase, the temperature difference becomes larger, thereby affecting the dehumidification effect.

[0035] 5. This application has a higher level of integration and a smaller cavity, meeting the needs of highly dynamic working conditions. Since the moisture content of gas is highly correlated with temperature, with high moisture content at high temperatures and low moisture content at low temperatures, the main dehumidification heat load is concentrated in the high-temperature section. Therefore, the first stage uses the large temperature difference between the cooling water inside the coil and the external dehumidification liquid to achieve a higher dehumidification load within a limited area. The second stage uses the large heat exchange area to reduce the temperature difference between the cooling coil and the bubbling dehumidification water, achieving a lower dehumidification temperature.

[0036] 6. This application solves the shortcomings of the existing technology, such as large separation and dehumidification unit volume, low dynamic performance, and narrow operating range. It achieves comprehensive technical improvement through an integrated multi-stage bubbling dehumidification separation device, bringing significant benefits to the development and testing of water electrolysis hydrogen production systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a schematic structural diagram of a multi-stage high-efficiency bubbling dehumidification separation device according to Example 1 of the present invention;

[0038] Figure 2 This is a schematic structural diagram of the gas-liquid bubbling dehumidification component in Example 1 of the present invention;

[0039] Figure 3 This is a schematic structural diagram of a multi-stage high-efficiency bubbling dehumidification separation device according to Example 2 of the present invention;

[0040] Figure 4 This is a schematic structural diagram of a multi-stage high-efficiency bubbling dehumidification separation device according to Example 3 of the present invention;

[0041] Description of reference numerals:

[0042] 1. Inlet; 2. Gas outlet; 3. Liquid outlet; 4. Separation and dehumidification tank; 5. Liquid level sensor; 6. Water supply port; 7. Gas-liquid separation device; 8. Droplet capture device;

[0043] 200, gas-liquid bubbling dehumidification assembly; 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;

[0044] 900. Bubble treatment device. DETAILED DESCRIPTION

[0045] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0046] Example 1

[0047] Reference Figure 1A multi-stage high-efficiency bubbling dehumidification separation device includes a separation and dehumidification tank body 4 and a two-stage gas bubbling dehumidification assembly 200 installed inside the separation and dehumidification tank body 4. A gas outlet 2 is opened at the top of the separation and dehumidification tank body 4, a liquid outlet 3 is opened at the bottom of the separation and dehumidification tank body 4, and an inlet 1 is opened at a lower position of a side wall of the separation and dehumidification tank body 4, wherein the two-stage gas bubbling dehumidification assembly 200 is located above the inlet 1; a liquid level sensor 5 is also provided at a lower position of the separation and dehumidification tank body 4;

[0048] The gas-liquid mixture to be treated can enter the separation and dehumidification tank body 4 from the inlet 1. After gravity separation, most of the liquid drops and settles to the inner bottom of the separation and dehumidification tank body 4, and the initially separated high-temperature and high-humidity gas with some liquid droplets enters the two-stage separation and dehumidification component 200 for water washing, cooling and dehumidification. The gas after dehumidification and separation by the two-stage separation and dehumidification component 200 is finally discharged from the gas outlet 2, and the separated liquid is discharged from the liquid outlet 3.

[0049] Reference Figure 2 The two-stage gas bubbling dehumidification components 200 are set in two groups in this application, but are not limited to two groups. The specific implementation depends on the actual situation. This application only gives one of the preferred implementation methods; the gas bubbling dehumidification components 200 are used for gas dehumidification and are installed inside the separator 4. Each stage of the gas bubbling dehumidification components 200 are independent of each other; there is a certain distance between the two.

[0050] Furthermore, the two-stage gas bubbling dehumidification assembly 200 has the same structure. This application describes the first-stage gas bubbling dehumidification assembly 200 as an example:

[0051] Reference Figure 2 The gas 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 air inlet. The air pipe 202 is equipped 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 open 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 out from the air guide pipe 203 downward, and finally be discharged from the gas distribution plate 204.

[0052] Furthermore, a dehumidification liquid is filled in the gas 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. When the gas is inside the air inlet pipe 202 and the air duct 203, it can be cooled to a certain extent. 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 bubbling dehumidification component 200 and the high-temperature and high-humidity gas with some droplets entering can be cooled.

[0053] 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 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. the bottom of the dehumidification tank; therefore, the high-temperature and high-humidity gas containing some liquid droplets is discharged from the gas distribution plate 204 and mixed with the dehumidification liquid. At this time, the cooling heat exchange coil 205 cools the dehumidification 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 dehumidification liquid, the dehumidification 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 body 4 or the next-level gas bubbling dehumidification component 200.

[0054] 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 descends along the outer wall of the air inlet pipe 202 and the internal space of the air guide pipe 203 to the bottom gas distribution chamber. After being evenly distributed by the gas distribution plate 204, it flows out. The outflowing airflow contacts the dehumidification liquid (or cooling water) in the gas-liquid bubbling dehumidification component 200, undergoing a water-washing bubbling reaction. By rationally designing the bubbling area, bubbling flow rate, and bubbling liquid level, 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 provided at the bottom of the separation and dehumidification tank body 4. A liquid level sensor 5 is provided at the lower upper position of the separation and dehumidification tank body 4 for liquid level monitoring or control. A liquid replenishing 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 the initial operation or when liquid replenishment is required.

[0055] The overflow port of overflow pipe 208 is designed near the coil, allowing the coil to be mostly submerged in the liquid for sufficient heat exchange. When the liquid level exceeds overflow pipe 208, condensed liquid flows downward through overflow pipe 208, ensuring a stable liquid level. The top of inlet pipe 202 is positioned above the liquid level to prevent liquid backflow after shutdown. Air guide pipe 203 is positioned higher than inlet pipe 202 to ensure sufficient space for gas to circulate between the two.

[0056] It should be noted that the bubbling area, bubbling flow rate, and bubbling liquid level are determined by the plate hole diameter, porosity, and distribution plate hole arrangement of the gas distribution plate 204. It is necessary to design a reasonable gas flow rate based on the actual working conditions involved, adjust the size of the bubbling bubbles, and make the air flow out in the form of uniform small bubbles 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 the gas at each level can be fully dehumidified. The specific design is based on actual conditions and is not limited by this application.

[0057] The gas bubbling dehumidification of this application is a direct contact dehumidification method, and the heat of the liquid is taken away by the cooling heat exchange coil 205 or other similar heat exchangers; the gas-liquid two-phase fluid is vigorously mixed in the gas-liquid bubbling dehumidification component 200, and the gas temperature is basically the same as the liquid temperature after mixing. Generally speaking, the dehumidification temperature is required to be low, and the lower the temperature, the better the dehumidification effect. It is usually required to be reduced to below 20°C. The general coolant temperature is 8-12°C, and the temperature difference on both sides of the coil or heat exchanger is small. When the heat dissipation load is constant, a larger heat exchange area is required for heat transfer.

[0058] The multi-stage bubbling water washing dehumidification design is adopted, and the temperature difference design of the two stages is calculated through comprehensive evaluation, rather than simply superimposing the number of stages or the size of the dehumidification unit, thereby achieving better dehumidification efficiency.

[0059] For example:

[0060] Assume that the inlet temperature of the gas-liquid mixture is 90°C @ 1 bar (g), the water vapor partial pressure is 70.34 kPa, and the moisture content is about 334.07 g / kg.

[0061] After the first stage of dehumidification, the temperature is lowered to 55℃@1bar(g), the water vapor partial pressure is 15.82kPa, and the moisture content is about 53.06g / kg;

[0062] After secondary dehumidification, the temperature is lowered to 20℃@1bar(g), the water vapor partial pressure is 2.35kPa, and the moisture content is about 7.355g / kg;

[0063] The first stage dehumidification reduces the temperature from 90℃ to 55℃, accounting for about 86% of the total dehumidification from 90℃ to 20℃. The cooling water inlet temperature of the first stage dehumidification coil is 12℃ and the outlet temperature is 25℃, with an average logarithmic temperature difference of 36.5℃.

[0064] The second stage dehumidification reduces humidity from 50°C to 20°C, accounting for approximately 14% of the total dehumidification from 90°C to 20°C. The cooling water inlet temperature of the second stage dehumidification coil is 12°C and the outlet temperature is 18°C, with an average logarithmic temperature difference of 4.32°C.

[0065] Therefore, 86% of the dehumidification heat is completed at a higher temperature difference of 36.5℃, and 14% of the dehumidification heat is completed at a lower temperature difference. The use of multi-stage separation utilizes the high temperature difference of the first stage for efficient dehumidification, and the second stage for more thorough low-temperature dehumidification.

[0066] Exploiting the relationship between saturated gas moisture content and temperature, at the same pressure, the moisture content is higher at high temperatures and lower at low temperatures, resulting in the primary dehumidification heat load being concentrated in the high-temperature range. As the temperature drops, the saturated gas moisture content decreases significantly, reducing the dehumidification heat exchange load in the low-temperature range. Therefore, leveraging this characteristic, multi-stage bubbling dehumidification offers higher efficiency. The first stage utilizes the large temperature difference between the cooling water inside the coil and the external dehumidifying liquid to achieve a higher dehumidification load within a limited area. The second stage, with a smaller temperature difference, offers a lower dehumidification load. Through appropriate heat transfer area design, even lower dehumidification temperatures can be achieved. For example, at 1 MPa, the first stage reduces the temperature from 90°C to 60°C, while the second stage reduces the temperature from 60°C to 20°C. The enthalpy change between the two operating conditions is approximately 0.1%, meaning the dehumidification load of the first stage is approximately four times that of the second stage.

[0067] The water-wash bubbling dehumidification method ensures thorough mixing of the gas and liquid for mass and heat transfer, resulting in high efficiency. The dehumidified gas temperature is essentially the same as the dehumidification water temperature. A staged approach is employed, with the first-stage water wash at a relatively medium-high temperature of 50-90°C, creating a significant temperature difference with the coolant in coil 205. This allows for high-load heat exchange with a small heat exchange area. After the dehumidified gas enters the second stage, the water-wash dehumidification temperature is designed to be 10-30°C, enhancing the final dehumidification effect and ensuring a low moisture content in the dehumidified gas. Due to the small temperature difference between the bubbling water wash and the coolant in coil 205, the second stage is designed to reduce the gas temperature from 50-90°C to 10-30°C, resulting in a lower heat exchange load compared to the first-stage high-temperature dehumidification section. Consequently, a larger number of heat exchange coils is not required to increase the heat exchange area.

[0068] Example 2

[0069] Reference Figure 3 , the rest is the same as Example 1, except that: in this Example 2, a gas-liquid separation device 7 is added inside the separation and dehumidification tank body 4 and on one side of the inlet 1. The gas-liquid separation device 7 can reduce the impact of the gas-liquid mixture at the inlet 1, change the flow direction of the gas-liquid mixture, evacuate the gas and liquid, and make the droplets more likely to settle.

[0070] The gas-liquid combing device 7 of this embodiment can adopt various forms such as a distribution plate, a corrugated packing, a baffle, etc., and this application does not limit it.

[0071] A droplet capture device 8 is installed on the top inner side of the separation and dehumidification tank 4, below the gas outlet 2. This device further separates tiny droplets from the gas after filtering, bubbling, and dehumidification. After being processed by the droplet capture device 8, the gas is discharged from the separator gas outlet 2.

[0072] The droplet capture device 8 of this embodiment can be made of materials such as a wire mesh demister, a filler, and a polymer filter element, and this application does not limit this.

[0073] Example 3

[0074] Reference Figure 4 The rest is the same as Example 2, except that, in this Example 3, a bubble processing device 900 is added to the inner bottom of the separation and dehumidification tank body 4. The bubble processing device 900 can effectively block and capture bubbles in the circulating liquid, and prevent bubbles from being directly discharged from the liquid outlet 3.

[0075] 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 they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. 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 various embodiments of the present invention.

Claims

1. A multi-stage high-efficiency bubbling dehumidification separation device, comprising a separation and dehumidification tank (4), characterized in that: An inlet (1) is provided on the side wall of the separation and dehumidification tank body (4), and a gas outlet (2) and a liquid outlet (3) are provided on the top and bottom of the separation and dehumidification tank body (4), respectively; At least two stages of mutually independent gas-liquid bubbling dehumidification components (200) are provided inside the separation dehumidification tank (4) and above the inlet (1); the two stages of the gas-liquid bubbling dehumidification components (200) include a cooling heat exchange component and an air intake pipe for air intake 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; Arranged sequentially from bottom to top, the gas temperature of each stage of the gas-liquid bubbling dehumidification component (200) decreases step by step after dehumidification; The gas-liquid bubbling dehumidification component (200) includes an air inlet pipeline, wherein the middle of the air inlet pipeline is convex upward, and the cooling heat exchange component is arranged in a winding manner on the outside of the convexity; air outlets are provided at horizontal positions at both ends of the air inlet pipeline, and the air outlet direction of the air outlet is toward the cooling heat exchange component; an overflow pipe (208) is also 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 air intake pipeline comprises an air intake pipe (202) and an air guide pipe (203). The middle position of the air guide pipe (203) is raised upwards, the air intake pipe (202) is installed inside the raised portion, and the top of the air intake pipe (202) is in communication with the air guide pipe (203).

2. A multi-stage high-efficiency bubbling dehumidification separation device according to claim 1, characterized in that: The gas-liquid bubbling dehumidification components (200) of the plurality of stages are not simply superimposed stages. The gas-liquid bubbling dehumidification components (200) located at the front stages below utilize a large temperature difference to complete heavy-load dehumidification, and the gas-liquid bubbling dehumidification components (200) located at the rear stages above utilize a large heat exchange area to achieve a low dehumidification temperature.

3. The multi-stage high-efficiency bubbling dehumidification separation device according to claim 1, characterized in that: The overflow pipe (208) in each stage of the gas-liquid bubbling dehumidification assembly (200) from bottom to top can overflow the condensed liquid above the liquid level after dehumidification into the gas-liquid bubbling dehumidification assembly (200) of the next stage, and the overflow pipe (208) in the first stage of the gas-liquid bubbling dehumidification assembly (200) can overflow the condensed liquid above the liquid level to the bottom of the separation dehumidification tank (4).

4. The multi-stage high-efficiency bubbling dehumidification separation device according to claim 1, characterized in that: A droplet catching device (8) is provided on the inner top of the separation and dehumidification tank body (4) and below the gas outlet (2).

5. The multi-stage high-efficiency bubbling dehumidification separation device according to claim 1, characterized in that: The cooling heat exchange component includes a cooling heat exchange coil (205), the cooling heat exchange coil (205) is spirally arranged, 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).

6. The multi-stage high-efficiency bubbling dehumidification separation device according to claim 1, characterized in that: A bubble processing device (900) is provided at the inner bottom of the separation and dehumidification tank body (4) and above the liquid outlet (3).

7. A dehumidification and separation method using a multi-stage high-efficiency bubbling dehumidification and separation device according to any one of claims 1 to 6, characterized in that: The steps include: The gas to be treated enters the separation and dehumidification tank from the inlet; After gravity separation, some of the liquid droplets in the gas settle to the bottom of the separation and dehumidification tank, and the gas rises into the separation and dehumidification component below; The inflowing airflow contacts the bubbling water washing liquid in the separation and dehumidification component, undergoes water washing and bubbling treatment, and cools the gas to a temperature close to that of the water washing and bubbling liquid, thus achieving cooling and dehumidification; The treated gas enters the separation and dehumidification component above for the same water washing and bubbling treatment, achieving two-stage cooling and dehumidification; Finally, the gas separated by bubbling dehumidification is discharged from the gas outlet, and the liquid separated is discharged from the liquid outlet.

8. Use of the multi-stage high-efficiency bubbling dehumidification separation device according to any one of claims 1 to 6 in a process of producing hydrogen by electrolysis of water.

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