Gas-liquid separation tower, gas-liquid separation system and alkaline water electrolysis hydrogen production system

Abstract

The utility model discloses a gas-liquid separation tower, a gas-liquid separation system and an alkaline water electrolysis hydrogen production system. The gas-liquid separation tower comprises a tower body, and a gas introduction pipe and a heat exchange pipe which are positioned in the tower body; the tower body is provided with a first gas inlet, a water replenishing port, an overflow port, a refrigerant inlet, a refrigerant outlet and a first gas outlet; a washing and cooling cavity is formed in the tower body below the overflow port; the first gas inlet is connected with a gas source to be washed and cooled, one end of the gas introduction pipe is connected with the first gas inlet, the other end of the gas introduction pipe extends into the washing and cooling cavity, and the water replenishing port is connected with a washing liquid source; the heat exchange pipe is at least partially located in the washing cooling cavity, and the two ends of the heat exchange pipe are connected with the refrigerant inlet and the refrigerant outlet correspondingly. And the first gas outlet is positioned above the overflow port. When the gas-liquid separation tower is applied, washing and cooling of gas to be washed and cooled can be integrated in the same area of one device, so that the gas-liquid separation tower is relatively simple in structure and relatively small in occupied space.

Description

Technical Field

[0001] The present application relates to the technical field of hydrogen production by alkaline water electrolysis, and in particular to a gas-liquid separation tower, a gas-liquid separation system and an alkaline water electrolysis hydrogen production system. Background Art

[0002] The technology of hydrogen production by water electrolysis mainly includes alkaline water electrolysis, proton exchange membrane water electrolysis and high-temperature solid oxide water electrolysis. Among them, alkaline water electrolysis is the mainstream water electrolysis technology. Alkaline water electrolysis generally uses alkaline solution as electrolyte, and electrolyzes water into oxygen and hydrogen under the action of direct current. After the alkali liquid leaves the electrolyzer with hydrogen and oxygen, the gas-liquid separators of hydrogen and oxygen are usually used to separate the corresponding gas and alkali liquid respectively, and the separation efficiency of the gas-liquid separator is limited. The separated gas still carries a certain amount of alkali liquid. If it is directly transported to the outside, it will not only waste the alkali liquid, but also damage the downstream equipment, and will also bring great difficulties to the further purification of the gas. Therefore, a scrubber is usually used to wash the gas after gas-liquid separation to wash away part of the alkali liquid entrained by the gas. The washed gas is then cooled and dehydrated by a cooler. The cooled gas finally enters the gas-water separator for gas-water separation to obtain high-purity gas and discharge the remaining liquid to the outside. Most of the liquid produced by the above-mentioned washing and cooling flows back to the gas-liquid separator, and the water replenishment device will also replenish water to the electrolysis system through the scrubber to make up for the water consumed in the generation of hydrogen and oxygen, the liquid water discharged by the gas-water separator, and the saturated gaseous water leaving the system together with the gas.

[0003] In the related art, alkaline water electrolysis gas-liquid separation systems mostly use separate equipment to wash and cool the gas products respectively. Each device needs to be connected with pipelines, which makes the system structure complicated and occupies a large space.

[0004] To this end, the relevant technology has improved the gas-liquid separation system. For example, the invention patent application with publication number CN116726636A discloses a gas water washing tower and a gas separation system, in which a gas distributor is arranged in the gas water washing tower, and the tower body is divided into an upper water washing chamber and a lower kettle liquid chamber. A water washing gas outlet and a liquid distributor are arranged from top to bottom in the water washing chamber, a gas bubbler is arranged in the kettle liquid chamber, and an overflow port is arranged between the gas bubbler and the gas distributor, and the water washing gas outlet at the upper end of the water washing chamber is connected to a cooler, and the gas after water washing passes through the cooler from bottom to top for cooling; Authorization announcement number The utility model patent CN219314576U discloses an integrated gas treatment device and a water electrolysis system. The shell of the integrated gas treatment device is provided with a gas inlet and a gas outlet on the side wall, and a liquid outlet is provided at the bottom. A first capture mechanism, a washing mechanism, a cooling mechanism and a second capture mechanism are arranged in sequence from bottom to top. The first capture mechanism is used to remove liquid droplets in the gas to be treated entering the gas inlet, and then the washing mechanism is used to wash the gas, and then the cooling mechanism is used to remove saturated water in the gas, and finally the second capture mechanism is used to remove liquid droplets in the gas to be discharged. Although these gas-liquid separation systems integrate gas washing and cooling into one device, washing and cooling are still carried out separately in different areas of the device, and a synergistic effect cannot be formed, and the space occupied by the system is still large.

[0005] Therefore, how to provide a solution to overcome or alleviate the above-mentioned defects is still a technical problem that needs to be solved urgently by those skilled in the art. Utility Model Content

[0006] The purpose of the present application is to provide a gas-liquid separation tower, which can integrate the washing and cooling of the gas to be washed and cooled in the same area of ​​a device, which is not only relatively simple in structure, but also occupies relatively small space. Another purpose of the present application is to provide a gas-liquid separation system. Another purpose of the present application is to provide an alkaline water electrolysis hydrogen production system.

[0007] In order to solve the above technical problems, the present application provides a gas-liquid separation tower, which includes a tower body, a gas introduction pipe and a heat exchange pipe located inside the tower body;

[0008] The tower body has a first gas inlet, a water replenishment port, an overflow port, a refrigerant inlet, a refrigerant outlet and a first gas outlet;

[0009] The tower body forms a washing and cooling cavity below the overflow port; the first gas inlet is used to connect to the cooling gas source to be washed, one end of the gas introduction pipe is connected to the first gas inlet and the other end extends into the washing and cooling cavity, and the water replenishment port is used to connect to the water washing liquid source; the heat exchange tube is at least partially located in the washing and cooling cavity, and the two ends of the heat exchange tube are respectively connected to the refrigerant inlet and the refrigerant outlet; the first gas outlet is located above the overflow port.

[0010] The gas-liquid separation tower provided in the present application is provided with a gas introduction pipe and a heat exchange pipe inside the tower body, and is provided with a first gas inlet, a water replenishment port, an overflow port, a refrigerant inlet, a refrigerant outlet and a first gas outlet on the tower body. At the same time, a washing cooling chamber is formed below the overflow port, and the first gas inlet is connected to the cooling gas source to be washed, one end of the gas introduction pipe is connected to the first gas inlet and the other end extends into the washing cooling chamber, the water replenishment port is connected to the washing liquid source, the heat exchange pipe is at least partially located in the washing cooling chamber, and the two ends of the heat exchange pipe are respectively connected to the refrigerant inlet and the refrigerant outlet, and the first gas outlet is located above the overflow port. In this way, when in use, the washing liquid enters the washing and cooling chamber through the water replenishment port, so that the liquid level in the washing and cooling chamber is maintained at the same level or below the overflow port, and the cooling gas to be washed enters the washing and cooling chamber through the gas inlet pipe, and can be washed in the washing and cooling chamber. At the same time, the refrigerant can enter the heat exchange tube through the refrigerant inlet, and then flow out of the heat exchange tube through the refrigerant outlet. The gas can exchange heat with the liquid in the washing and cooling chamber and the heat exchange tube, so that the washing and cooling of the cooling gas to be washed are integrated in the same area of ​​​​a device, with a high degree of integration. Not only does it occupy a relatively small space and have a relatively simple structure, but it can also achieve a collaborative effect.

[0011] Optionally, the gas-liquid separation tower further comprises a gas distribution plate;

[0012] The gas distribution plate is arranged in the washing and cooling chamber, and the other end of the gas introduction pipe is located below the gas distribution plate.

[0013] Optionally, the heat exchange tube is a spiral disc heat exchange tube.

[0014] Optionally, the gas introduction pipe includes a horizontal introduction pipe and a vertical introduction pipe that are interconnected;

[0015] The first gas inlet is located above the overflow port, the horizontal introduction pipe is connected to the first gas inlet, and the bottom end of the vertical introduction pipe extends into the washing and cooling chamber.

[0016] Optionally, the gas-liquid separation tower further includes a demister;

[0017] The demister is arranged inside the tower body and located above the overflow port, and the first gas outlet is located above the demister.

[0018] The present application also provides a gas-liquid separation system, comprising a gas-liquid separator and the gas-liquid separation tower;

[0019] The gas-liquid separator includes a gas-liquid separator body, which has a liquid inlet, a liquid outlet, a second gas outlet and a first reflux port, the liquid inlet is used to be connected to a source of a gas-liquid mixture to be separated, the second gas outlet is connected to the first gas inlet, and the overflow port is connected to the first reflux port.

[0020] Optionally, the gas-liquid separation system further includes a gas-water separator;

[0021] The gas-water separator comprises a gas-water separator body, the gas-water separator body has a second gas inlet and a liquid discharge port, the second gas inlet is connected to the first gas outlet, the tower body has a second reflux port, the liquid discharge port is connected to the second reflux port.

[0022] Optionally, the gas-liquid separator, the gas-liquid separation tower and the gas-water separator are arranged in sequence from bottom to top.

[0023] The present application also provides an alkaline water electrolysis hydrogen production system, comprising an alkaline electrolytic cell and two of the gas-liquid separation systems;

[0024] The oxygen side outlet and the hydrogen side outlet of the alkaline electrolytic cell are respectively connected to the liquid inlets of the two gas-liquid separation systems, and the alkali liquid inlet of the alkaline electrolytic cell is connected to the liquid outlets of the two gas-liquid separation systems.

[0025] Optionally, a balance port is provided at the bottom of the gas-liquid separator body, and the balance ports of the two gas-liquid separation systems are connected. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the structure of the gas-liquid separation tower of the embodiment provided in this application;

[0027] Figure 2 This is a schematic diagram of the structure of the gas-liquid separation system of the embodiment provided in this application.

[0028] The reference numerals in the above drawings are described as follows:

[0029] 1-gas-liquid separator, 1a-liquid inlet, 1b-liquid outlet, 1c-second gas outlet, 1d-first reflux port, 1e-balance port, 1f-liquid pool, 1g-gravity separation chamber, 11-gas-liquid separator body, 12-liquid distribution pipe;

[0030] 2-gas-liquid separation tower, 2a-first gas inlet, 2b-water replenishment port, 2c-overflow port, 2d-refrigerant inlet, 2e-refrigerant outlet, 2f-first gas outlet, 2g-second reflux port, 2h-washing cooling chamber, 21-tower body, 22-gas inlet pipe, 221-horizontal inlet pipe, 222-vertical inlet pipe, 23-heat exchange pipe, 24-gas distribution plate, 25-demister;

[0031] 3-gas-water separator, 3a-second gas inlet, 3b-liquid discharge port, 3c-third gas outlet, 31-gas-water separator body, 32-packing layer;

[0032] 4-first gas outlet pipe;

[0033] 5- second gas outlet pipe;

[0034] 6- Overflow pipe;

[0035] 7-liquid return pipe;

[0036] 8- Check valve. DETAILED DESCRIPTION

[0037] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0038] It should be specially noted that the words “first”, “second”, etc. in this application are only used to facilitate the description of two or more structures or components with the same or similar structures and / or functions, and do not imply any special limitation on the order and / or importance.

[0039] In this application, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or a communication connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0040] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of the gas-liquid separation tower of the embodiment provided in this application.

[0041] In the embodiment provided in the present application, the gas-liquid separation tower 2 includes a tower body 21, a gas inlet pipe 22 and a heat exchange pipe 23 located inside the tower body 21; the tower body 21 has a first gas inlet 2a, a water replenishment port 2b, an overflow port 2c, a refrigerant inlet 2d, a refrigerant outlet 2e and a first gas outlet 2f; the tower body 21 forms a washing and cooling chamber 2h below the overflow port 2c; the first gas inlet 2a is used to connect to the cooling gas source to be washed, one end of the gas inlet pipe 22 is connected to the first gas inlet 2a, and the other end extends into the washing and cooling chamber 2h, and the water replenishment port 2b is used to connect to the water washing liquid source; the heat exchange pipe 23 is at least partially located in the washing and cooling chamber 2h, and the two ends of the heat exchange pipe 23 are respectively connected to the refrigerant inlet 2d and the refrigerant outlet 2e; the first gas outlet 2f is located above the overflow port 2c.

[0042] When in use, the washing liquid can enter the washing and cooling chamber 2h through the water replenishment port 2b, so that the liquid level of the washing and cooling chamber 2h can be maintained at the same level or below the overflow port 2c, and the cooling gas to be washed can enter the washing and cooling chamber 2h through the gas introduction pipe 22 to be washed in the washing and cooling chamber 2h. At the same time, the refrigerant can enter the heat exchange tube 23 through the refrigerant inlet 2d, and then flow out of the heat exchange tube 23 through the refrigerant outlet 2e. The gas can exchange heat with the liquid in the washing and cooling chamber 2h and the heat exchange tube 23, so that the washing and cooling of the cooling gas to be washed are integrated in the same area of ​​a device, namely the gas-liquid separation tower 2, with a high degree of integration. Not only is the space occupied relatively small, the equipment investment cost can be reduced, the structure is relatively simple, and it can also achieve the effect of collaborative work.

[0043] Furthermore, in the related art, for example, in a gas washing tower disclosed in the invention patent application with publication number CN116726636A, the washed gas passes through the vertical heat exchange tubes of the cooler from bottom to top, and heat is exchanged with the refrigerant in the cooler to achieve gas cooling. In an integrated gas processing device disclosed in the utility model patent with authorization announcement number CN219314576U, the washed gas passes through the heat exchange tubes of the cooling mechanism from bottom to top, and heat is exchanged with the refrigerant in the cooling mechanism to achieve gas cooling. It can be seen that the cooling methods of the cooling components of both are gas-liquid indirect heat exchange, and the total heat transfer coefficient is determined by the gas side with poor heat transfer efficiency, and the heat transfer coefficient of the longitudinal gas convection heat transfer is low, and the heat transfer effect is poor. Compared with the above-mentioned prior art, the gas-liquid separation tower 2 provided in the embodiment of the present application introduces the cooling gas to be washed into the liquid in the washing and cooling chamber 2h. The cooling gas to be washed can directly contact the liquid for heat exchange, and the liquid can exchange heat with the refrigerant in the heat exchange tube 23, thereby realizing the composite heat exchange of gas-liquid-refrigerant and enhancing the heat exchange effect.

[0044] Please combine Figure 1It is understood that in the embodiment provided in the present application, the gas-liquid separation tower 2 also includes a gas distribution plate 24 ; the gas distribution plate 24 is arranged in the washing and cooling chamber 2h, and the other end of the gas introduction pipe 22 is located below the gas distribution plate 24 .

[0045] It is not difficult to understand that the gas distribution plate 24 can be provided with a plurality of gas through holes. When the cooling gas to be washed is introduced into the washing and cooling chamber 2h and below the gas distribution plate 24 through the gas introduction pipe 22, the cooling gas to be washed can be dispersed upward from the lower part of the washing and cooling chamber 2h through the gas through holes of the gas distribution plate 24 to the upper part of the washing and cooling chamber 2h to form gas dispersion bubbles, which can increase the contact area between the cooling gas to be washed and the liquid inside the washing and cooling chamber 2h, and can achieve uniform distribution of the cooling gas to be washed in the washing and cooling chamber 2h through the uniform distribution of the gas through holes, thereby further enhancing the washing effect and cooling effect.

[0046] In actual setting, the water replenishment port 2b can be arranged above the overflow port 2c, or can be arranged below the overflow port 2c, that is, arranged on the wall corresponding to the washing and cooling chamber 2h, without specific limitation.

[0047] In the examples provided in this application, please refer to Figure 1 The water replenishment port 2b is arranged on the wall corresponding to the washing and cooling chamber 2h and is located above the gas distribution plate 24. In this way, when the washing liquid moves into the interior of the washing and cooling chamber 2h through the water replenishment port 2b, a water replenishment jet can be formed. The water replenishment jet and the gas dispersion bubbles can further form a strong turbulence, thereby forming a composite enhanced heat exchange form of bubbles-liquid-refrigerant, which can further enhance the washing effect and cooling effect.

[0048] In actual setting, the specific structure and arrangement of the heat exchange tube 23 are not limited. For example, it can be a straight tube, a curved tube, or a spiral disc heat exchange tube. It can be set horizontally, vertically, or inclined.

[0049] In the embodiments provided in this application, please combine Figure 1 It is understood that the heat exchange tube 23 is a spiral disc heat exchange tube. In this way, the refrigerant inside the spiral disc heat exchange tube can flow not only in the vertical direction but also in the horizontal direction, which can increase the contact area between the heat exchange tube 23 and the liquid inside the washing and cooling chamber 2h, further enhance the heat exchange effect between the liquid inside the washing and cooling chamber 2h and the refrigerant inside the heat exchange tube 23, thereby enhancing the cooling effect of the cooling gas to be washed.

[0050] In actual setting, the specific position of the first gas inlet 2a and the structural form and specific position of the gas introduction pipe 22 are not limited.

[0051] As an alternative, please refer to Figure 1The first gas inlet 2a can be arranged above the overflow port 2c, and the gas introduction pipe 22 can include a horizontal introduction pipe 221 and a vertical introduction pipe 222 that are interconnected. The horizontal introduction pipe 221 can be connected to the first gas inlet 2a, and the bottom end of the vertical introduction pipe 222 can extend into the washing and cooling chamber 2h.

[0052] In fact, the first gas inlet 2a can also be provided on the side wall of the washing and cooling chamber 2h, and correspondingly, the gas introduction pipe 22 can be located in the washing and cooling chamber 2h, for example, it can be arranged horizontally to introduce the cooling gas to be washed into the washing and cooling chamber 2h in the horizontal direction. However, this form of gas introduction is similar to the gas introduction form of the gas water washing tower disclosed in the invention patent application with publication number CN116726636A in the above-mentioned related technology. In this related technology, the air inlet is provided on the wall corresponding to the liquid holding layer in the tower, and the gas bubbler connected to the air inlet is horizontally arranged in the liquid holding layer. When the pressure of the liquid in the tower or the upstream cooling gas source to be washed fluctuates, it may cause intermittent empty tower, affecting the washing effect. Figure 1 The gas introduction pipe 22 provided in the embodiment of the present application is L-shaped, and the cooling gas to be washed can be first introduced in the horizontal direction through the horizontal introduction pipe 221, and then introduced into the liquid inside the washing and cooling chamber 2h through the vertical introduction pipe 222 in the vertical direction. The vertical introduction pipe 222 can balance the above pressure fluctuations. For example, when the pressure inside the gas-liquid separation tower 2 is greater than the pressure of the upstream cooling gas source to be washed, the liquid level of the washing and cooling chamber 2h may drop, and the liquid level inside the vertical introduction pipe 222 may rise. The liquid level difference between the two can balance the pressure difference before and after; similarly, when the pressure inside the gas-liquid separation tower 2 is less than the pressure of the upstream cooling gas source to be washed, the liquid level of the washing and cooling chamber 2h may rise, and the liquid level inside the vertical introduction pipe 222 may drop. The liquid level difference between the two can balance the pressure difference before and after. In this way, the stable washing and cooling process can be guaranteed.

[0053] During the specific setting, the shape of the gas distribution plate 24 can match the cross-section of the gas-liquid separation tower 2, for example, both can be circular, and the vertical inlet pipe 222 of the gas inlet pipe 22 can pass through the middle of the gas distribution plate 24 and be inserted into the lower part of the washing and cooling chamber 2h. In this way, the distribution of the cooling gas to be washed can be more uniform, further improving the washing effect and cooling effect.

[0054] In the embodiment provided in the present application, the gas-liquid separation tower 2 further includes a demister 25 ; the demister 25 is arranged inside the tower body 21 and located above the overflow port 2c , and the first gas outlet 2f is located above the demister 25 .

[0055] It is not difficult to understand that the washing and cooling chamber 2h can be filled with liquid. After the washing and cooling gas is introduced into the liquid in the washing and cooling chamber 2h through the gas introduction pipe 22, the gas will leave the liquid layer in the form of bubbles due to its low density, and the initial separation of gas and liquid can be achieved; in the process of the gas leaving the liquid layer in the form of bubbles, a part of the liquid will be taken out, for example, a part of the liquid will be splashed out, and in the space above the washing and cooling chamber 2h, due to the density difference between the gas and the liquid, the liquid will fall back to the washing and cooling chamber 2h under the action of gravity, so that the gravity of the space can be used to achieve further separation of gas and liquid. The gas after washing and cooling can be dehydrated through the defoamer 25 to achieve another step of separation of gas and liquid and improve the gas-liquid separation effect.

[0056] The gas obtained after water removal by the demister 25 can leave the gas-liquid separation tower 2 through the first gas outlet 2f and can enter the subsequent processing process; the inside of the gas-liquid separation tower 2 can produce additional liquid due to washing, cooling, spatial gravity separation, and water removal by the demister 25, the liquid level in the washing and cooling chamber 2h can increase, and the liquid will overflow the gas-liquid separation tower 2 from the overflow port 2c.

[0057] In specific configuration, the demister 25 may be a corrugated plate demister or a wire mesh demister, without limitation.

[0058] In the examples provided in this application, please refer to Figure 1 The tower body 21 may also be provided with a second reflux port 2g, which may be connected to the outlet of a subsequent dehydration device. With such a configuration, the gas obtained after dehydration by the demister 25 may enter a subsequent process for further dehydration, and the liquid generated after dehydration may flow back to the washing and cooling chamber 2h through the second reflux port 2g, thereby saving resources.

[0059] When setting up specifically, the relative positions of the water supply port 2b, the refrigerant inlet 2d, the refrigerant outlet 2e and the second return port 2g are not limited. As an optional solution, please refer to Figure 1 The refrigerant inlet 2d can be arranged above the overflow port 2c, the water replenishment port 2b, the refrigerant outlet 2e and the second return port 2g can be arranged on the wall of the washing and cooling chamber 2h and located above the gas distribution plate 24, the water replenishment port 2b and the second return port 2g can be arranged above the refrigerant outlet 2e, and the refrigerant outlet 2e can be as close to the gas distribution plate 24 as possible to increase the vertical length of the heat exchange tube 23 in the washing and cooling chamber 2h and enhance the heat exchange effect.

[0060] In addition, the spiral heat exchange tube can be coaxially arranged with the tower body 21, which can increase the overall horizontal radial dimension of the spiral heat exchange tube as much as possible, which is beneficial to increase the contact area between the spiral heat exchange tube and the liquid in the washing and cooling chamber 2h, and can enhance the heat exchange effect.

[0061] It is worth noting that the distance of the overflow port 2c relative to the bottom of the tower body 21 is not limited. The distance from the overflow port 2c to the bottom of the tower body 21 is defined as D1, and the distance from the top of the tower body 21 to the bottom of the tower body 21 is defined as D2. D1 can be between 60%D2 and 70%D2, for example, it can be 2D2 / 3. In this way, the height of the liquid holding layer of the washing and cooling chamber 2h can be relatively guaranteed to be within a suitable range, so that the liquid holding layer will not be too low to affect the washing and cooling effect of the gas. It can also be relatively guaranteed that the height between the overflow port 2c and the demister 25 is within a suitable range, so that the length of the vertical introduction pipe 222 of the gas introduction pipe 22 located above the liquid holding layer of the washing and cooling chamber 2h is within a suitable range, thereby relatively guaranteeing the pressure balance effect of the vertical introduction pipe 222, and at the same time, the gas overflowing the liquid holding layer can have a certain space to separate the carried droplets.

[0062] Please refer to Figure 2 , Figure 2 This is a schematic diagram of the structure of the gas-liquid separation system of the embodiment provided in this application.

[0063] In the embodiments provided in the present application, the gas-liquid separation system includes a gas-liquid separator 1 and a gas-liquid separation tower 2 in all the above embodiments; the gas-liquid separator 1 includes a gas-liquid separator body 11, the gas-liquid separator body 11 has a liquid inlet 1a, a liquid outlet 1b, a second gas outlet 1c and a first reflux port 1d, the liquid inlet 1a is used to be connected to a source of a gas-liquid mixture to be separated, the second gas outlet 1c is connected to the first gas inlet 2a, the second gas outlet 1c can be specifically connected to the first gas inlet 2a of the gas-liquid separation tower 2 through a first gas outlet pipe 4, the overflow port 2c is connected to the first reflux port 1d, and the overflow port 2c can be specifically connected to the first reflux port 1d through an overflow pipe 6.

[0064] The gas-liquid separation system provided in the embodiment of the present application adopts the gas-liquid separation tower 2 in all the above embodiments, which can improve the integration of the system, occupy less space, and has a simpler structure. At the same time, it can also improve the washing and cooling effect of the gas-liquid mixture.

[0065] It is not difficult to understand that the liquid level inside the gas-liquid separator body 11 can be controlled within a certain range, a liquid pool 1f can be formed below the water surface, and a gravity separation chamber 1g can be formed above the water surface. The liquid inlet 1a can be located on the wall corresponding to the liquid pool 1f, and the gas-liquid mixture to be separated can enter the liquid pool 1f through the liquid inlet 1a. The gas in the gas-liquid mixture to be separated will leave the liquid layer in the form of bubbles due to its low density, thereby realizing the preliminary gas-liquid separation of the gas-liquid mixture to be separated; in the process of the gas leaving the liquid layer in the form of bubbles, a part of the liquid may be brought out, for example, a part of the liquid may be splashed out, and after the gas and the part of the liquid brought out enter the upper gravity separation chamber 1g, in the large space of the gravity separation chamber 1g, due to the density difference between the gas and the liquid, the liquid will fall back into the liquid pool 1f under the action of gravity, thereby realizing further gas-liquid separation of the gas-liquid mixture to be separated.

[0066] In the embodiment provided in the present application, the gas-liquid separation system also includes a gas-water separator 3; the gas-water separator 3 includes a gas-water separator body 31, the gas-water separator body 31 has a second gas inlet 3a and a liquid discharge port 3b, the second gas inlet 3a is connected to the first gas outlet 2f, the second gas inlet 3a can be specifically connected to the first gas outlet 2f of the gas-liquid separation tower 2 through the second gas introduction pipe 5, the liquid discharge port 3b can be connected to the second reflux port 2g of the tower body 21, and the liquid discharge port 3b can be specifically connected to the second reflux port 2g through the liquid return pipe 7.

[0067] With such arrangement, the gas-liquid mixture to be separated can be initially separated from the gas and liquid in the gas-liquid separator 1, and then further separated from the gas and liquid after washing and cooling in the gas-liquid separation tower 2, and finally finally separated from the gas and liquid in the gas-water separator 3. The liquid generated in the gas-water separator 3 can be refluxed to the gas-liquid separation tower 2 through the drain port 3b and the second reflux port 2g in sequence, and the additional liquid generated by water replenishment, washing, cooling and reflux from the downstream in the gas-liquid separation tower 2 can be refluxed to the gas-liquid separator 1 through the overflow port 2c and the first reflux port 1d in sequence, so that the liquid generated in the gas-water separator 3 can be recycled, the loss of water and alkali in the system can be reduced, and secondary water treatment is not required.

[0068] In the related art, a gas-liquid separation system is proposed to realize the recycling of the liquid generated by the gas-water separator 3. For example, the utility model patent with the authorization announcement number CN216891240U discloses a waste liquid recovery system for a water electrolysis hydrogen production device. The waste liquid recovery system includes a gas-liquid separator, a scrubber, a gas cooler, and a gas-water separator connected in sequence to the gas outlet of the self-made hydrogen device. One end of the recovery pipeline is connected to the water outlet of the gas-water separator and the other end is connected to the scrubber. A water storage tank and a pumping part are arranged on the recovery pipeline. The gas coming out of the gas cooler is passed into the gas-water separator. The water separated by the gas-water separator can be collected and recovered in the water storage tank, and enter the scrubber for recycling under the action of the pumping parts. The recovered liquid needs to return to the scrubber through the water storage tank and the booster pump. Each level must be drained and pumped separately according to the liquid level, which will increase the complexity of the system. In addition, the process of the drainage from the gas-water separator into the water storage tank is a pressure reduction process (from about 1.6MPa to atmospheric pressure), and then it is pressurized to more than 1.6MPa by the pump and returned to the scrubber, which will cause energy waste. At the same time, the process of the drainage entering the water storage tank will discharge a certain amount of hydrogen into the air, which will also cause energy waste. For another example, the utility model patent with authorization announcement number CN219315090U discloses a water electrolysis hydrogen production system with no waste liquid discharge, which includes an electrolyzer unit, a hydrogen gas-liquid separation unit, an oxygen gas-liquid separation unit and an alkali liquid circulation pump unit. The oxygen port and the hydrogen port of the electrolyzer unit are respectively connected to the inlet of the oxygen gas-liquid separation unit and the inlet of the hydrogen gas-liquid separation unit. A condensate recovery pipeline is connected between the condensate outlet of the gas-water separator of the gas-liquid separation unit and the inlet of the alkali liquid circulation pump unit. The condensate output port of the condensate recovery pipeline is located within the pump suction range of the alkali liquid circulation pump unit, and waste liquid can be recovered. However, the system pipeline is relatively complicated, and even if the recovered liquid is directly sent to the inlet of the alkali liquid circulation pump, the system's liquid return is directly subject to the pressure conditions of the pump inlet. When the pumping pressure is high, it may cause problems such as liquid return difficulty.

[0069] Please combine Figure 2 It is understood that in the embodiment of the present application, the gas-liquid separator 1, the gas-liquid separation tower 2 and the gas-water separator 3 are arranged in sequence from bottom to top, that is, the gas-liquid separator 1 is at the bottom, the gas-liquid separation tower 2 is in the middle, and the gas-water separator 3 is at the top. In this way, gravity can be used to realize automatic reflux and overflow of liquid. In particular, the gas-water separator 3 only needs to use a return liquid pipe 7 to realize the automatic reflux of the produced liquid to the gas-liquid separation tower 2, without the need to add additional components such as water storage tanks and booster pumps, so that the structure of the system is simpler, energy can be saved, and reflux is easy, which can improve the return liquid efficiency.

[0070] In the embodiment of the present application, the gas-liquid separator 1 may further be provided with a liquid distribution pipe 12 inside, and the liquid distribution pipe 12 may be connected to the liquid inlet 1a. Figure 2 As shown, it is arranged horizontally and can be arranged in the liquid pool 1f. The tube wall of the liquid distribution pipe 12 can be provided with multiple liquid passing holes. In this way, the gas-liquid mixture to be separated can be dispersed into the liquid pool 1f through the liquid distribution pipe 12, which is beneficial to increase the contact area between the gas-liquid mixture to be separated and the liquid in the liquid pool 1f, and improve the gas-liquid separation effect of the gas-liquid mixture to be separated.

[0071] In the embodiment of the present application, the lower end of the overflow pipe 6 can extend into the liquid pool 1f in the gas-liquid separator body 11, and can be specifically located below the liquid distribution pipe 12. In this way, the overflowing liquid can be directly sent into the liquid in the liquid pool 1f to achieve stable liquid overflow.

[0072] During actual configuration, the specific structure of the gas-water separator 3 is not limited.

[0073] In the embodiment provided in the present application, the gas-water separator 3 further includes a packing layer 32, which is arranged inside the gas-water separator body 31 and above the second gas inlet 3a, and the drain port 3b can be arranged at the bottom of the gas-water separator body 31, and the top of the gas-water separator body 31 can be provided with a third gas outlet 3c. In this way, the gas washed and cooled by the gas-liquid separation tower 2 can enter the gas-water separator body 31 through the second gas introduction pipe 5, and can first achieve a preliminary separation of gas and liquid under the action of gravity, and the separated gas can be further dehydrated upward through the packing layer 32, and the gas after further dehydration can leave the gas-water separator 3 through the third gas outlet 3c, and the liquid produced by the gas-water separation can be concentrated in the lower part of the gas-water separator body 31, and can be refluxed to the gas-liquid separation tower 2 from the drain port 3b through the liquid return pipe 7, which can not only achieve efficient separation of gas and liquid, but also achieve recycling of separated water.

[0074] In the specific setting, a one-way valve 8 can be provided in the liquid return pipe 7 to prevent the system pressure fluctuation from causing the liquid inside the gas-liquid separation tower 2 to return to the gas-water separator 3, thereby ensuring the stable recovery and utilization process of the liquid produced by the gas-water separator 3.

[0075] Please combine Figure 2 It is understood that in the gas-liquid separation system provided in the embodiment of the present application, the gas-liquid separator 1 can be horizontal, the gas-liquid separation tower 2 can be vertical, and the gas-water separator 3 can also be vertical, so that the efficiency of gas-liquid separation can be further improved.

[0076] In the embodiments provided in the present application, the alkaline water electrolysis hydrogen production system includes an alkaline electrolyzer (not shown in the figure) and two gas-liquid separation systems in all the above embodiments; the oxygen side outlet and the hydrogen side outlet of the alkaline electrolyzer are respectively connected to the liquid inlets 1a of the two gas-liquid separation systems, that is, the oxygen side outlet of the alkaline electrolyzer is connected to the liquid inlet 1a of one of the gas-liquid separation systems, the hydrogen side outlet of the alkaline electrolyzer is connected to the liquid inlet 1a of the other gas-liquid separation system, and the alkali liquid inlet of the alkaline electrolyzer is connected to the liquid outlets 1b of the two gas-liquid separation systems.

[0077] It is not difficult to understand that electrolysis in an alkaline electrolytic cell produces hydrogen and oxygen. When leaving the alkaline electrolytic cell, hydrogen and oxygen will carry along part of the alkali liquid to form a hydrogen-alkali liquid mixture and an oxygen-alkali liquid mixture. The hydrogen-alkali liquid mixture and the oxygen-alkali liquid mixture can respectively enter the gas-liquid separator 1 of the corresponding gas-liquid separation system to perform preliminary separation of the corresponding gas and alkali liquid. The gas obtained by the preliminary separation may carry a certain amount of alkali liquid and needs to be further separated by gas-liquid separation. The water replenishment device connected to the water replenishment port 2b of the gas-liquid separation tower 2 can replenish water according to the liquid level of the washing and cooling chamber 2h, so that the washing and cooling chamber 2h can be filled with low-concentration alkali solution. After the gas obtained by preliminary separation carries the alkali solution into the liquid inside the washing and cooling chamber 2h, it is washed and part of the alkali solution is washed into the washing and cooling chamber 2h. At the same time, the gas and liquid as well as the refrigerant inside the heat exchange tube 23 perform heat exchange to cool the gas. Part of the alkali solution carried by the gas is condensed and liquefied and remains in the washing and cooling chamber 2h. Subsequently, the washed and cooled gas may carry moisture when leaving the washing and cooling chamber 2h. When passing through the space above the overflow port 2c and between the demister 25, gas-liquid separation is further realized under the action of gravity. After further dehydration by the demister 25, the gas leaves the gas-liquid separation tower 2 through the first gas outlet 2f. The gas leaving the gas-liquid separation tower 2 may still carry some water, and finally enters the gas-water separator 3 for further dehydration. After dehydration in the gas-water separator 3, high-purity hydrogen or oxygen can be obtained. The hydrogen or oxygen leaves the gas-water separator 3 from the third gas outlet 3c and can enter the subsequent collection or processing device.

[0078] Among them, the gas-liquid separation tower 2 can realize the integrated integration of washing, cooling and water replenishment, and the three functions are integrated in the same area, which has a good collaborative working effect and a high degree of integration, so that the entire alkaline water electrolysis hydrogen production system occupies a relatively small space, has a relatively simple structure, and has a relatively low equipment investment cost.

[0079] The liquid obtained by gas-water separation in the gas-water separator 3 can be refluxed to the gas-liquid separation tower 2 through the liquid return pipe 7. The liquid generated by water replenishment, washing, cooling, spatial gravity separation, dewatering by the demister 25, and reflux from the gas-water separator 3 in the gas-liquid separation tower 2 is concentrated in the washing and cooling chamber 2h. When the liquid level of the washing and cooling chamber 2h is higher than the height of the overflow port 2c, the alkali liquid inside the washing and cooling chamber 2h overflows from the overflow port 2c through the overflow pipe 6 to the inside of the gas-liquid separator 1. This overflowed part of the alkali liquid and the alkali liquid obtained by gas-liquid separation in the gas-liquid separator 1 can enter the alkali liquid cooling circulation system (not shown in the figure) through the liquid outlet 1b for cooling, and finally reflux to the alkaline electrolytic cell. In this process, the alkali liquid in the hydrogen alkali liquid mixture and the oxygen alkali liquid mixture can be recycled, especially the water produced by the most downstream gas-water separator 3 can be recycled, which can reduce the loss of water, hydrogen, oxygen and alkali liquid in the alkaline water electrolysis hydrogen production system to ensure the smooth progress of the alkaline water electrolysis hydrogen production process. There is no need to perform secondary treatment on the water produced by the gas-water separator 3, which can reduce the water treatment cost.

[0080] In the examples provided in this application, please refer to Figure 2 A balance port 1e may be provided at the bottom of the gas-liquid separator body 11, and the balance ports 1e of the two gas-liquid separation systems may be connected via a balance pipe (not shown in the figure).

[0081] It is not difficult to understand that the liquid outlet 1b of the gas-liquid separator 1 of the two gas-liquid separation systems on the oxygen side and the hydrogen side can be connected to the relevant pipelines (not shown in the figure) and the alkali liquid inlet of the alkaline electrolyzer through the alkali liquid circulation pump (not shown in the figure), the alkali liquid cooler (not shown in the figure), that is, the alkali liquid inside the two gas-liquid separators 1 will eventually converge together. By connecting the balance ports 1e of the two gas-liquid separators 1 through a balance pipe, the liquid levels of the two gas-liquid separators 1 can be basically balanced, which can prevent one of the gas-liquid separators 1 from having no alkali liquid, resulting in the two gas-liquid separators 1 on the hydrogen side and the oxygen side being connected and causing gas to explode, which can improve the safety of the gas-liquid separation process of the alkaline water electrolysis hydrogen production system and relatively ensure the smooth progress of the alkaline water electrolysis hydrogen production process.

[0082] The principles and implementation methods of the present application are described in this article using specific examples. The description of the above embodiments is only used to help understand the device and its core idea of ​​the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A gas-liquid separation tower, characterized in that: The gas-liquid separation tower (2) comprises a tower body (21), a gas introduction pipe (22) and a heat exchange pipe (23) located inside the tower body (21); The tower body (21) has a first gas inlet (2a), a water replenishment port (2b), an overflow port (2c), a refrigerant inlet (2d), a refrigerant outlet (2e) and a first gas outlet (2f); The tower body (21) forms a washing and cooling chamber (2h) below the overflow port (2c); the first gas inlet (2a) is used to connect to a cooling gas source to be washed, one end of the gas introduction pipe (22) is connected to the first gas inlet (2a) and the other end extends into the washing and cooling chamber (2h), and the water replenishment port (2b) is used to connect to a washing liquid source; the heat exchange tube (23) is at least partially located in the washing and cooling chamber (2h), and the two ends of the heat exchange tube (23) are respectively connected to the refrigerant inlet (2d) and the refrigerant outlet (2e); the first gas outlet (2f) is located above the overflow port (2c).

2. The gas-liquid separation tower according to claim 1, characterized in that: The gas-liquid separation tower (2) further comprises a gas distribution plate (24); The gas distribution plate (24) is arranged in the washing and cooling chamber (2h), and the other end of the gas introduction pipe (22) is located below the gas distribution plate (24).

3. The gas-liquid separation tower according to claim 1 or 2, characterized in that: The heat exchange tube (23) is a spiral disc type heat exchange tube.

4. The gas-liquid separation tower according to claim 1 or 2, characterized in that: The gas introduction pipe (22) comprises a horizontal introduction pipe (221) and a vertical introduction pipe (222) which are interconnected; The first gas inlet (2a) is located above the overflow port (2c), the horizontal introduction pipe (221) is connected to the first gas inlet (2a), and the bottom end of the vertical introduction pipe (222) extends into the washing and cooling chamber (2h).

5. The gas-liquid separation tower according to claim 1 or 2, characterized in that: The gas-liquid separation tower (2) further comprises a demister (25); The demister (25) is arranged inside the tower body (21) and is located above the overflow port (2c); the first gas outlet (2f) is located above the demister (25).

6. A gas-liquid separation system, characterized in that: Comprising a gas-liquid separator (1) and a gas-liquid separation tower (2) according to any one of claims 1 to 5; The gas-liquid separator (1) comprises a gas-liquid separator body (11), the gas-liquid separator body (11) having a liquid inlet (1a), a liquid outlet (1b), a second gas outlet (1c) and a first reflux port (1d), the liquid inlet (1a) being used to be connected to a source of a gas-liquid mixture to be separated, the second gas outlet (1c) being connected to the first gas inlet (2a), and the overflow port (2c) being connected to the first reflux port (1d).

7. The gas-liquid separation system according to claim 6, characterized in that: The gas-liquid separation system further comprises a gas-water separator (3); The gas-water separator (3) comprises a gas-water separator body (31), the gas-water separator body (31) having a second gas inlet (3a) and a liquid discharge port (3b), the second gas inlet (3a) being connected to the first gas outlet (2f), the tower body (21) having a second reflux port (2g), the liquid discharge port (3b) being connected to the second reflux port (2g).

8. The gas-liquid separation system according to claim 7, characterized in that: The gas-liquid separator (1), the gas-liquid separation tower (2) and the gas-water separator (3) are arranged in sequence from bottom to top.

9. An alkaline water electrolysis hydrogen production system, characterized in that: comprising an alkaline electrolytic cell and two gas-liquid separation systems according to any one of claims 6 to 8; The oxygen side outlet and the hydrogen side outlet of the alkaline electrolytic cell are respectively connected to the liquid inlets (1a) of the two gas-liquid separation systems, and the alkali liquid inlet of the alkaline electrolytic cell is connected to the liquid outlets (1b) of the two gas-liquid separation systems.

10. The alkaline water electrolysis hydrogen production system according to claim 9, characterized in that: A balance port (1e) is provided at the bottom of the gas-liquid separator body (11), and the balance ports (1e) of the two gas-liquid separation systems are connected.

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