Multi-stage efficient bubbling, dehumidifying and separating device, dehumidifying and separating method and application

Abstract

The invention discloses a multi-stage efficient bubbling, dehumidifying and separating device which comprises a separating and dehumidifying tank body, and at least two stages of mutually independent gas-liquid bubbling and dehumidifying assemblies are arranged in the separating and dehumidifying tank body and located above an inlet; the two-stage gas-liquid bubbling dehumidification assembly comprises a cooling heat exchange assembly and a gas inlet pipeline allowing gas to enter from the bottom, the gas-liquid bubbling dehumidification assembly is filled with dehumidification liquid, and gas in the dehumidification liquid is cooled and dehumidified through the cooling heat exchange assembly. According to the multi-stage gas bubbling dehumidification assembly, to-be-treated gas and dehumidification liquid can be mixed, the temperature of the gas is reduced to be approximately consistent with the temperature of the dehumidification liquid through the cooling heat exchange assembly, through the temperature difference design of all stages of dehumidification heat exchange, the better dehumidification efficiency is achieved, and through the multi-stage bubbling dehumidification principle, the dehumidification efficiency is improved. Efficient dehumidification can be respectively carried out in a high-temperature section and a low-temperature section, and the device is suitable for occasions needing high-precision dehumidification, such as cathode and anode gas separation and dehumidification treatment in the process of producing hydrogen by electrolyzing water.

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 indispensable part of many industrial processes, especially in the process of hydrogen production by water electrolysis, where the dehumidification of hydrogen and oxygen is crucial. Existing dehumidification technologies often face problems such as high energy consumption, bulky equipment, and high maintenance costs when dealing with high-humidity gases. The traditional single-stage dehumidification solution is not only inefficient, but also occupies a large space and is difficult to meet the needs of modern industrial production. At the same time, traditional single-stage dehumidification devices are difficult to achieve efficient dehumidification effects when dealing with highly dynamic conditions.

[0003] At present, in the field of hydrogen production by water electrolysis, the operation of hydrogen production by water electrolysis is relatively stable, and the gas moisture content is high, especially the high-power hydrogen production system, which produces a large amount of hydrogen. However, the current dehumidification of gas by water electrolysis mainly adopts the combination of horizontal separator and heat exchanger. The overall system size is large, the dynamic performance is low, the start-stop and load change are slow, and it is difficult to couple with new energy sources such as wind and light.

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

[0005] 1. Traditional heat exchangers have poor adaptability to different operating conditions; especially for the wide range of operating conditions for hydrogen production by water electrolysis, the low-condition gas flows unevenly and slowly in the traditional heat exchanger, and the mass and heat transfer efficiency is low. Partially too low flow rate makes it difficult to remove the condensed liquid film on the surface of the heat exchanger, forming a liquid film layer barrier, which further affects mass and heat transfer.

[0006] 2. Traditional heat exchangers have poor dehumidification and shock resistance. Especially for the application of water electrolysis to produce hydrogen, there are variable load conditions. The gas output changes greatly during the load change. This leads to rapid changes in the dehumidification load. Due to the indirect heat exchange principle of traditional heat exchangers, there is a temperature difference between the cold side and the hot side. When the temperature changes rapidly, it is difficult to ensure the stability of the dehumidification effect.

[0007] 3. Single-stage gas dehumidification has low efficiency, large dehumidification unit size, large system volume, and difficulty in performing 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 levels of mutually independent gas-liquid bubbling dehumidification components are arranged inside the separation dehumidification tank and above the inlet; the two-level gas-liquid bubbling dehumidification components include a cooling heat exchange component and an air intake pipeline for air intake 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 gas-liquid bubbling dehumidification component.

[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. 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 anode and cathode gas separation and dehumidification treatment 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 stages. The gas-liquid bubbling dehumidification components located at the first few stages at the bottom use a large temperature difference to complete high-load dehumidification, and the gas-liquid bubbling dehumidification components located at the last few stages 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 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 assembly, 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 stage of the gas-liquid bubbling dehumidification component from bottom to top can overflow the condensate above the liquid level after dehumidification into the next stage of the gas-liquid bubbling dehumidification component, while the overflow pipe in the first stage of the gas-liquid bubbling dehumidification component 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 treatment 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 separation method of a multi-stage high-efficiency bubbling dehumidification 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 contained 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 secondary cooling and dehumidification;

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

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

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

[0031] 1. 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 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 yin and yang gas separation and dehumidification treatment in the process of hydrogen production by electrolysis of water;

[0032] 2. The multi-stage separation dehumidification unit of the present application is arranged from bottom to top in sequence. The gas temperature decreases step by step after each stage of dehumidification. Through the special design of the air inlet pipe and the overflow pipe, it is ensured that the treated gas runs upward for dehumidification in sequence, and the dehumidified condensed liquid flows downward in sequence and enters the bottom liquid storage tank. The integrated design integrates gas-liquid separation and dehumidification separation, reduces the equipment volume, and improves the integration;

[0033] 3. The present application has a wider range of working conditions: the bubbling water washing dehumidification method is adopted to allow the high-temperature and high-humidity gas to directly contact the bubbling water washing liquid. Through reasonable gas distribution, bubbling liquid level, bubbling flow rate, liquid entrainment rate, mass transfer and heat transfer coefficient and other designs, the gas flow and liquid have sufficient mass transfer and heat transfer area to carry out sufficient mass and heat exchange; at the same time, the advantage of gas bubbling in the liquid is utilized, and the gas can be fully and violently mixed with the liquid in the range of high and low working conditions (1-150%), avoiding the defects of uneven gas flow and low heat transfer efficiency in the traditional heat exchanger when the traditional heat exchanger is operated under low working conditions; therefore, it can adapt to a wider range of working conditions;

[0034] 4. The present application has a higher ability to resist variable loads: the bubbling water washing dehumidification method is adopted to allow the high-temperature and high-humidity gas to directly contact the bubbling water washing liquid. The temperature of the bubbling dehumidification gas is close to the temperature of the bubbling water washing water and the bubbling dehumidification water has a large hot melt, which is equivalent to having a very large low-temperature hot melt. It can adapt to the impact of high-dynamic working conditions and keep the water washing temperature consistent. In the traditional heat exchanger cooling method, there is a temperature difference between the cold side and the hot side. When the working condition rises, the temperature difference becomes larger, which affects the dehumidification effect.

[0035] 5. This application has a higher integration level and a smaller volume, meeting the requirements of highly dynamic working conditions. 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, and the main dehumidification heat load is concentrated in the high temperature section, 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 within a limited area, and the second stage uses the large heat exchange area to reduce the temperature difference between the cooling coil and the bubbling dehumidification water to achieve 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 diagram of the structure of the gas-liquid bubbling dehumidification component in Example 1 of the present invention;

[0039] Figure 3 This is a schematic diagram of the structure 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 diagram of the structure 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] 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 below 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.

[0046] Example 1

[0047] Reference Figure 1A multi-stage high-efficiency bubbling dehumidification separation device comprises a separation dehumidification tank body 4 and a two-stage gas bubbling dehumidification assembly 200 installed inside the separation dehumidification tank body 4, a gas outlet 2 is provided at the top of the separation dehumidification tank body 4, a liquid outlet 3 is provided at the bottom of the separation dehumidification tank body 4, an inlet 1 is provided at a lower position of a side wall of the separation 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 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 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 of the preferred implementation modes. 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 structures of the two-stage gas bubbling dehumidification components 200 are the same, and the present application takes the first-stage gas bubbling dehumidification component 200 as an example for description:

[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 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.

[0052] Furthermore, a dehumidification liquid is filled in the gas bubbling dehumidification component 200 and located above the partition 201. The dehumidification liquid may 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 a 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 a 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. 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 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 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 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 set at the bottom of the separation dehumidification tank body 4. A liquid level sensor 5 is set 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 the initial operation or when liquid replenishment is needed.

[0055] 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.

[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 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.

[0057] The gas bubbling dehumidification of the present application is a direct contact dehumidification method, and the heat of the liquid is taken away by cooling the heat exchange coil 205 or other similar heat exchangers; the gas-liquid two-phase fluid is violently 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] It adopts a multi-stage bubbling water washing dehumidification design, 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, so as to achieve better dehumidification efficiency.

[0059] For example:

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

[0061] After the first-stage dehumidification, the temperature is reduced 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 reduced 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 86% of the total dehumidification from 90℃ to 20℃. The first-stage dehumidification coil cooling water inlet temperature is 12℃, outlet temperature is 25℃, and the average logarithmic temperature difference is 36.5℃

[0064] The secondary dehumidification is reduced from 50℃ to 20℃, accounting for about 14% of the total dehumidification from 90℃ to 20℃. The secondary dehumidification coil cooling water inlet temperature is 12℃, outlet temperature is 18℃, and the average logarithmic temperature difference is 4.32℃.

[0065] Therefore, 86% of the dehumidification heat is completed at a higher temperature difference of 36.5°C, and 14% of the dehumidification heat is completed at a low 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] By using the relationship between saturated gas moisture content and temperature, under the same pressure, the moisture content is high 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, in which 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, and the second stage has a small temperature difference, but the dehumidification load is lower. 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 by about, and the dehumidification load of the first stage is about 4 times that of the second stage.

[0067] 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, and there is a large temperature difference with the cooling liquid in the coil 205, so that a small heat exchange area can be used to complete a large load of heat exchange. 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, which is smaller than the first stage high temperature section dehumidification and dehumidification heat exchange load. Therefore, there is no need for a lot of heat exchange coils 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 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, and evacuate the gas and liquid to make the droplets more easily settle.

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

[0071] 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;

[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 9 is added to the inner bottom of the separation dehumidification tank body 4. The bubble processing device 9 can effectively block and capture bubbles in the circulating liquid to prevent the 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 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. A multi-stage high-efficiency bubbling dehumidification separation device, comprising a separation dehumidification tank (4), characterized in that: The side wall of the separation dehumidification tank body (4) is provided with an inlet (1), and the top and bottom of the separation dehumidification tank body (4) are respectively provided with a gas outlet (2) and a liquid outlet (3); At least two stages of mutually independent gas-liquid bubbling dehumidification components (200) are arranged 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 pipeline for air intake from the bottom; the gas-liquid bubbling dehumidification components (200) are filled with dehumidification liquid, and the gas inside the dehumidification liquid is cooled and dehumidified by the cooling heat exchange component; Arranged in sequence from bottom to top, the gas temperature decreases step by step after dehumidification in each stage of the gas-liquid bubbling dehumidification assembly (200).

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 stacked, the gas-liquid bubbling dehumidification components (200) located at the front several stages at the bottom use a large temperature difference to complete a large-load dehumidification, and the gas-liquid bubbling dehumidification components (200) located at the rear several stages at the top use a large heat exchange area to achieve a low dehumidification temperature.

3. A multi-stage high-efficiency bubbling dehumidification separation device according to claim 1, characterized in that: The gas-liquid bubbling dehumidification component (200) comprises an air inlet pipeline, wherein the middle of the air inlet pipeline is bulged upward, and the cooling heat exchange component is arranged in a winding manner on the outside of the bulge; 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.

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

5. The multi-stage high-efficiency bubbling dehumidification separation device according to claim 3 is characterized in that: The air intake pipeline comprises an air intake pipe (202) and an air guide pipe (203), wherein the middle position of the air guide pipe (203) protrudes upwards, the air intake pipe (202) is installed inside the protrusion, and the top of the air intake pipe (202) is connected to the air guide pipe (203).

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

7. The multi-stage high-efficiency bubbling dehumidification separation device according to claim 1 is 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).

8. 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).

9. A dehumidification separation method of the multi-stage high-efficiency bubbling dehumidification separation device according to any one of claims 1 to 8, 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 contained 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, and performs water washing and bubbling treatment to cool the gas to a temperature close to that of the water washing and bubbling liquid, thereby achieving cooling and dehumidification; The treated gas enters the separation and dehumidification component above for the same water washing and bubbling treatment, achieving secondary cooling and dehumidification; Finally, the gas separated by bubbling dehumidification is discharged from the gas outlet, and the separated liquid is discharged from the liquid outlet.

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

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