Multi-bed gas purification device and system

Abstract

The application discloses a multi-bed gas purification device and system, wherein a first catcher and a partition plate are arranged in a purification reactor from top to bottom, so as to divide the inner cavity of the purification reactor into a first purification zone, a second purification zone and a third purification zone from top to bottom; the partition plate is provided with a plurality of porous sintered tubes extending to the second purification zone, and the two ends of the porous sintered tubes are opened to form a gas-liquid passage connecting the second purification zone and the third purification zone; the pressure nozzle is located in the first purification zone, and after the lean liquid is sprayed out through the pressure nozzle, the lean liquid first enters the first catcher and forms a gas-liquid adsorption bed, then a part of the lean liquid accumulates on the partition plate to form a liquid accumulation bed, and the other part of the lean liquid passes through the gas-liquid passage together with the overflow of the liquid accumulation bed and forms a liquid phase bed in the third purification zone; the first micro-bubble generator is located in the liquid phase bed; and the exhaust pipe is connected with a backflow pipe for backflowing a part of the purified gas to the liquid accumulation bed and forming micro-bubbles.

Description

Technical Field

[0001] This invention relates to the field of gas purification technology, specifically a multi-bed gas purification device and system. Background Technology

[0002] Raw natural gas and sulfur recovery tail gas generally contain high concentrations of H2S. High concentrations of H2S not only corrode equipment and pipelines, but also cause poisoning and deactivation of catalysts in subsequent processing. At the same time, H2S is a highly toxic gas that pollutes the environment and forms acid rain, posing a great threat to personal safety. It is a gaseous pollutant that must be strictly controlled.

[0003] Industrially, wet and dry methods are commonly used to remove H2S. Wet desulfurization methods include chemical absorption, physical absorption, and physical-absorption-chemical (i.e., wet oxidation), suitable for applications with large gas volumes and high H2S content. Dry desulfurization is often used for treating low-sulfur gases, and common methods include membrane separation, molecular sieve methods, pressure swing adsorption, non-renewable fixed-bed adsorption, and cryogenic separation. In the petrochemical industry, chemical absorption is widely used to remove H2S from liquefied petroleum gas (LPG), with commonly used absorbents including N-methyldiethanolamine solution, sodium hydroxide solution, or ammonia.

[0004] Currently, H2S in desulfurized liquefied petroleum gas (LPG) is mainly removed through a desulfurization tower, specifically by passing gaseous LPG into a hydrogen sulfide absorbent. However, when using this method, the gaseous LPG quickly escapes from the absorbent, resulting in a short reaction time with the absorbent. Consequently, the amine solution does not completely absorb the absorbent, leading to a slow desulfurization rate and frequent failures in desulfurization testing of the desulfurized LPG.

[0005] Therefore, in 2023, the applicant filed patent CN117065539A, proposing a micro-droplet dual-enhanced liquefied gas desulfurization reactor, reaction system, and reaction method. This method disperses the desulfurized liquefied gas into liquefied gas droplets and introduces them into an amine liquid environment for desulfurization mass transfer. The mass transfer mechanism of the liquefied gas droplets in both the amine liquid and liquefied gas-liquid zones is countercurrent contact mass transfer, enhancing the mass transfer effect between the liquefied gas and the amine liquid. In 2023, the applicant also filed patent CN116712846A, proposing a micro-droplet and microbubble dual-enhanced desulfurization device and method. This method introduces lean desulfurization solvent into the desulfurization reactor through a pressure nozzle, and introduces sulfur-containing gas into the liquid phase through a microbubble generator to generate microbubbles. During the upward movement of the microbubbles, they undergo mass transfer desulfurization with the downward-flowing lean desulfurization solvent. Then, the microbubbles, having removed most of the sulfur, escape from the surface of the lean desulfurization solvent and come into contact with the sprayed lean desulfurization droplets for further mass transfer desulfurization, thus improving the desulfurization efficiency. However, in practical applications, although the escaping gas comes into contact with the small droplets, it cannot be guaranteed that the flue gas will completely contact the small droplets, and the flue gas rises too quickly, resulting in a short contact reaction time, which still affects the desulfurization effect. At the same time, when the desulfurization reactor stops working, if the flow of sulfur-containing gas and lean desulfurization solvent is stopped at the same time, the residual sulfur-containing gas in the reactor will not be completely desulfurized and will flow out, affecting the desulfurization effect. It is only possible to continue to inject lean desulfurization solvent for a period of time after the flow of sulfur-containing gas is stopped to ensure the desulfurization of the residual sulfur-containing gas, resulting in the waste of lean desulfurization solvent. Summary of the Invention

[0006] To address the problem of poor desulfurization performance in existing technologies, this invention provides a multi-bed gas purification device that allows for more thorough and complete mixing of the gas to be purified with lean liquid, thereby improving the desulfurization effect and further reducing the sulfur content of the purified gas.

[0007] To achieve the above objectives, the specific solution adopted by the present invention is as follows: a multi-bed gas purification device, comprising a vertical purification reactor, a rich liquid outlet at the bottom of the purification reactor, an exhaust pipe at the top for discharging purified gas, a pressure nozzle at the top of the purification reactor for injecting lean liquid into the purification reactor, a first microbubble generator at the bottom of the purification reactor for introducing the gas to be purified into the purification reactor, and a first trap and a partition plate arranged from top to bottom inside the purification reactor, thereby dividing the inner cavity of the purification reactor into a first purification zone, a second purification zone, and a third purification zone from top to bottom. The partition plate is provided with multiple porous sintered tubes extending to the second purification zone, and the two ends of the porous sintered tubes are open to form a gas-liquid channel connecting the second purification zone and the third purification zone; the pressure nozzle is located in the first purification zone. After the lean liquid is sprayed out through the pressure nozzle, it first enters the first trap and forms a gas-liquid adsorption bed. Then, part of it accumulates on the partition plate to form a liquid bed, and the other part, together with the overflow of the liquid bed, passes through the gas-liquid channel and forms a liquid bed in the third purification zone. The first microbubble generator is located in the liquid bed; the exhaust pipe is connected to a return pipe that returns part of the purified gas to the liquid bed to form microbubbles.

[0008] As an optimized solution of the above-mentioned multi-bed gas purification device: the first trap includes two pressure plates arranged horizontally in the purification reactor, a filling area is formed between the two pressure plates, the filling area is filled with metal wires, and gas-liquid mass transfer gaps are formed between the metal wires.

[0009] As another optimized solution for the aforementioned multi-bed gas purification device, the partition plate and the porous sintered tube are made of porous ceramic material.

[0010] As another optimized solution for the aforementioned multi-bed gas purification device: one end of the return pipe is connected to the side wall of the exhaust pipe, and the other end of the return pipe is connected to multiple branch pipes, with a second microbubble generator located in the liquid accumulation bed at the end of the branch pipe.

[0011] As another optimized solution for the aforementioned multi-bed gas purification device: a second trap is provided in the first purification zone above the pressure nozzle.

[0012] As another optimized solution for the aforementioned multi-bed gas purification device: each of the porous sintered tubes is provided with a long strip-shaped elastic sheet at its top end, one end of which extends to the gas-liquid channel, and the other end of which extends to the liquid accumulation bed.

[0013] As another optimized solution for the aforementioned multi-bed gas purification device, multiple flexible strips are distributed on the upper and lower surfaces of the elastic sheet.

[0014] As another optimized solution for the aforementioned multi-bed gas purification device: the elastic sheet is inclined, with its top end located above the liquid accumulation bed and its bottom end located inside the gas-liquid channel.

[0015] As another optimized solution for the aforementioned multi-bed gas purification device, the elastic sheet is S-shaped or an upwardly convex arc.

[0016] A multi-bed gas purification system includes a purification device and a regeneration tower. The purification device is the one described above. The pressure nozzle and the rich liquid outlet are both connected to the regeneration tower. The rich liquid at the bottom of the purification reactor is regenerated into a lean liquid by the regeneration tower, and the lean liquid is sprayed into the purification reactor through the pressure nozzle.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. This invention provides a multi-bed gas purification device. The gas to be purified enters the liquid phase bed through a first microbubble generator and undergoes mass transfer with the downward-flowing lean liquid during its upward movement. Microbubbles then escape from the liquid phase bed and continue to move upward. A portion of the escaping gas passes through a gas-liquid channel into a second purification zone, while another portion passes through the sidewall of a porous sintered tube and a partition plate into a liquid accumulation bed, forming bubbles for mass transfer. Return gas enters the liquid accumulation bed in the form of microbubbles for mass transfer. The two bubble flows collide in the liquid accumulation bed, enhancing the liquid accumulation bed. The turbulence of microbubbles within the bed enhances mass transfer. Two streams of bubbles then escape from the liquid-filled bed and enter the second purification zone. This escaping gas merges with the escaping gas entering the second space through the gas-liquid channel, creating a turbulence zone above the porous sintered tube. This increases the residence time of the gas to be purified in the second purification zone. Furthermore, the lean liquid, after passing through the first trap, drips down in droplets. The gas to be purified undergoes mass transfer with these droplets as it rises, then re-enters the first trap and undergoes mass transfer again within the gas-liquid mass transfer gap. Finally, the purified gas is discharged through the exhaust pipe. The gas to be purified undergoes mass transfer through multiple beds, and each purification zone contains droplets of lean liquid above it. This means that even after escaping the bed, the gas can still undergo mass transfer with the droplets of lean liquid, further improving the desulfurization effect and reducing the sulfur content in the purified gas.

[0019] 2. In this invention, the lean liquid in the porous sintered tube overflows into the liquid phase bed. The overflowing lean liquid column impacts the gas escaping from the liquid phase bed, changing the gas flow pattern and further improving the desulfurization effect while reducing the sulfur content of the purified gas. When the purification reactor stops working, the accumulated liquid bed in the porous sintered tube leaks, causing the lean liquid to form droplets that fall down, performing mass transfer on the residual sulfur-containing gas, improving the desulfurization effect and avoiding waste of the lean liquid.

[0020] 3. In this invention, an elastic sheet is provided at the top of the porous sintered tube. The escaping gas and lean liquid passing through the gas-liquid channel will collide with the elastic sheet, causing the elastic sheet to vibrate, thereby affecting the flow state of the gas. At the same time, microbubbles in the liquid bed or gas escaping from the liquid bed will also collide with the elastic sheet, causing the elastic sheet to vibrate, thereby affecting the flow state of the gas and microbubbles, further improving the desulfurization effect. Meanwhile, the droplets collide with the elastic sheet and break, further increasing the contact area between the gas and the droplets, thus improving the desulfurization effect.

[0021] 4. In this invention, the elastic sheet is inclined. Droplets falling from above the elastic sheet first adhere to and converge on the elastic sheet. When the converged droplets are large, they flow down from the elastic sheet. The moment they flow down, the elastic sheet vibrates significantly, meaning the amplitude of the vibration is variable, which further increases the degree of gas turbulence and improves the desulfurization effect. The top of the elastic sheet is located above the liquid accumulation bed, and the bottom of the elastic sheet is located inside the gas-liquid channel. When the liquid accumulation bed overflows, the elastic sheet also has a guiding function.

[0022] 5. In this invention, when the elastic sheet is tilted, if the bottom end of the elastic sheet extends to the liquid accumulation bed and the top end of the elastic sheet extends above the gas-liquid channel, the droplets will collect liquid flow on the upper surface of the elastic sheet and then flow into the liquid accumulation bed, which will impact the liquid accumulation bed, enhance the turbulence of the liquid accumulation bed, and thus improve the desulfurization effect.

[0023] 6. In this invention, flexible strips are provided on both sides of the elastic sheet. When gas blows over the flexible strips or droplets hit the flexible strips, the flexible strips will swing, thereby enhancing the turbulence around them and further enhancing the desulfurization effect of the gas. At the same time, when the liquid bed overflows, during the flow of the elastic sheet, the liquid flows down from different flexible strips, which also plays a role in dispersing the liquid, thereby increasing the contact area between the gas and the droplets and improving the desulfurization effect. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the present invention;

[0025] Figure 2 yes Figure 1 A magnified view of a portion of the image;

[0026] Figure 3 This is a schematic diagram of the structure when the bottom end of the elastic sheet is located in the gas-liquid channel;

[0027] Figure 4 This is a schematic diagram of the elastic sheet structure in Example 5;

[0028] Reference numerals: 1. Purification reactor; 101. Exhaust pipe; 102. Rich liquid outlet; 103. First purification zone; 104. Second purification zone; 105. Third purification zone; 106. Second trap; 2. Pressure nozzle; 3. First microbubble generator; 4. First trap; 5. Divider plate; 501. Liquid accumulation bed; 6. Porous sintered tube; 601. Gas-liquid channel; 7. Elastic sheet; 701. Flexible strip; 702. Spring; 8. Return pipe; 801. Second microbubble generator. Detailed Implementation

[0029] The technical solution of the present invention will be further described in detail below with reference to specific embodiments. Parts not described or disclosed in detail in the following embodiments of the present invention should be understood as prior art known or should be known by those skilled in the art, such as the structure of the pressure nozzle 2, how the pressure nozzle 2 sprays the lean liquid into the purification reactor 1, the specific structure of the first microbubble generator 3 and the second microbubble generator 801, how the first trap 4 and the partition plate 5 are connected to the inner wall of the purification reactor 1, etc.

[0030] Example 1

[0031] A multi-bed gas purification device, such as Figure 1 As shown, the purification reactor 1 is a vertical structure. A rich liquid outlet 102 is located at the bottom of the purification reactor 1, and an exhaust pipe 101 for discharging purified gas is located at the top. In this embodiment, the purification reactor 1 has a cylindrical structure with both its top and bottom plates being arc-shaped. The rich liquid outlet 102 and the exhaust pipe 101 are coaxial with the purification reactor 1. After mass transfer within the purification reactor 1, the lean liquid becomes rich liquid, which is then discharged from the purification reactor 1 through the rich liquid outlet 102. Similarly, after mass transfer within the purification reactor 1, the purified gas becomes purified gas and is then discharged through the exhaust pipe 101. A pressure nozzle 2 is located at the top of the purification reactor 1 for injecting lean liquid into the reactor 1. The pressure nozzle 2 atomizes the lean liquid into small droplets and diffuses them across the entire cross-section of the purification reactor 1. In this embodiment, the pressure nozzle 2 is a solid cone-shaped nozzle. The bottom of the purification reactor 1 is provided with a first microbubble generator 3 for introducing the gas to be purified into the purification reactor 1. The first microbubble generator 3 is connected to the gas source to be purified. The first microbubble generator 3 is used to introduce the gas to be purified into the lean liquid phase environment and generate microbubbles. In this embodiment, the first microbubble generator 3 is a tube-type structure with a dendritic structure, which has a larger flow area and can reduce the pressure drop of the gas to be purified flowing through the first microbubble generator 3.

[0032] The purification reactor 1 is equipped with a first trap 4 and a partition plate 5 arranged from top to bottom, thereby dividing the inner cavity of the purification reactor 1 into a first purification zone 103, a second purification zone 104, and a third purification zone 105 from top to bottom. There are 1-2 first traps 4; in this embodiment, there is one. The first trap 4 includes two horizontally arranged pressure plates within the purification reactor 1. Both pressure plates are circular grid structures, and their edges are sealed to the inner wall of the purification reactor 1 to prevent lean liquid from flowing down the gap between the inner wall of the purification reactor 1 and the edge of the pressure plate, thus affecting the mass transfer between the lean liquid and the gas to be purified. The two pressure plates are distributed along the height of the purification reactor 1, and a filling area is formed between the two pressure plates. The filling area is filled with metal wires made of titanium nanomaterials, and gas-liquid mass transfer gaps are formed between the metal wires. A pressure nozzle 2 is located within the first purification zone 103.

[0033] In this embodiment, the partition plate 5 is a circular plate structure, and the edge of the partition plate 5 is sealed to the inner wall of the purification reactor 1. Multiple porous sintered tubes 6 extending to the second purification zone 104 are provided on the partition plate 5. The porous sintered tubes 6 are circular tubular structures and are evenly spaced on the partition plate 5. Both the partition plate 5 and the porous sintered tubes 6 are made of porous ceramic material. The axis of the porous sintered tubes 6 is parallel to the axis of the purification reactor 1, and both ends of the porous sintered tubes 6 are open to form a gas-liquid channel 601 connecting the second purification zone 104 and the third purification zone 105. In this embodiment, the connection between the porous sintered tubes 6 and the partition plate 5 is as follows: the partition plate 5 has multiple mounting holes, the number of which is the same as the number of porous sintered tubes 6. The diameter of the mounting holes is equal to the outer diameter of the porous sintered tubes 6. The bottom end of the porous sintered tube 6 passes through the mounting hole, and its outer wall is sealed to the side wall of the mounting hole. The bottom end of the porous sintered tube 6 is flush with the lower surface of the partition plate 5.

[0034] After the lean liquid is sprayed out through the pressure nozzle 2, it is sprayed into the first purification zone 103, where it first enters the first trap 4 and forms a gas-liquid adsorption bed. Then, a portion accumulates on the partition plate 5 to form a liquid accumulation bed 501, while the other portion, connected to the overflow of the liquid accumulation bed 501, passes through the gas-liquid channel 601 and forms a liquid phase bed in the third purification zone 105. The first microbubble generator 3 is located within the liquid phase bed. In this embodiment, there are atomized droplets in the area between the pressure nozzle 2 and the first trap 4, and small droplets falling from the first trap 4 in the area between the first trap 4 and the liquid accumulation bed 501. The area between the liquid surface of the liquid phase bed and the lower surface of the partition plate 5 contains lean liquid overflowing from the liquid accumulation bed 501 and droplets seeping from the porous sintered tube 6 and the partition plate 5. During the ascent, the gas undergoes mass transfer with the lean liquid in these areas, improving the desulfurization effect of the purified gas.

[0035] The exhaust pipe 101 is connected to a return pipe 8 that returns a portion of the purified gas to the liquid bed 501 and forms microbubbles. The return pipe 8 is located outside the purification reactor 1, and one end of the return pipe 8 is connected to the side wall of the exhaust pipe 101. The other end of the return pipe 8 is connected to multiple branch pipes. The end of the branch pipe is equipped with a second microbubble generator 801 located in the liquid bed 501. The return gas enters the liquid bed 501 in the form of microbubbles through the second microbubble generator 801. After mass transfer in the liquid bed 501, the return microbubbles escape, which improves the desulfurization effect of the purified gas, that is, reduces the sulfur content of the purified gas.

[0036] Based on the above purification device, the gas purification method of this embodiment is as follows:

[0037] Before the gas is introduced into the purification reactor 1, lean liquid is introduced so that the liquid level of the liquid phase bed is at least above the first microbubble generator 3 and the liquid level of the accumulated liquid bed 501 is at least above the second microbubble generator 801. Then the gas to be purified is introduced into the purification reactor 1 and the operation begins.

[0038] The gas to be purified enters the liquid bed in the purification reactor 1 through the first microbubble generator 3, forming numerous micron-sized microbubbles within the liquid bed. As these microbubbles rise, they undergo mass transfer and desulfurization with the downward-flowing lean liquid. After most of the sulfur has been removed, the microbubbles escape from the liquid surface. The escaping gas then contacts the liquid flow and droplets in the third purification zone 105, further enhancing mass transfer and improving the desulfurization effect. As the escaping gas moves upward, it collides with the partition plate 5, causing turbulence in the area above the liquid bed in the third purification zone 105. Simultaneously, the droplets and liquid columns impact the escaping gas as they fall into the third purification zone 105, further increasing the turbulence and residence time, thus improving the desulfurization effect.

[0039] The escaping gas continues to move upwards. Most of the gas passes through the gas-liquid channel 601 and enters the second purification zone 104, while a portion of the gas passes through the partition plate 5 and the sidewall of the porous sintered tube 6 into the liquid bed 501, forming bubbles. These bubbles collide with the microbubbles formed by the returning gas in the liquid bed 501, changing the flow pattern of the two bubble streams and increasing their residence time in the liquid bed 501, further improving the desulfurization effect. The two bubble streams float to the surface in the liquid bed 501 and escape into the second purification zone 104. The gas passing through the gas-liquid channel 601 merges with the escaping gas in the liquid bed 501, forming a turbulence zone above the edge of the porous sintered tube 6, further enhancing the desulfurization effect. The merged gas continues to move upwards, transferring mass with the small droplets in the second purification zone 104 during its movement.

[0040] The gas continues to move upward and enters the second trap 106. The gas undergoes mass transfer in the gas-liquid adsorption bed and moves upward into the first purification zone 103. It then comes into contact with the atomized droplets sprayed from above for further mass transfer and desulfurization. The purified gas is finally discharged through the exhaust pipe 101.

[0041] In this embodiment, the gas to be purified passes through a liquid phase bed, a liquid accumulation bed 501, and a gas-liquid adsorption bed in sequence to complete multi-bed purification. At the same time, after escaping from the bed, it can transfer mass with the lean liquid in the corresponding purification zone, which improves the desulfurization effect and reduces the sulfur content in the purified gas.

[0042] After mass transfer with the gas to be purified, the lean liquid in the liquid phase bed becomes the rich liquid, which is discharged from the purification reactor 1 through the rich liquid outlet 102. When the purification device stops operating, the gas and lean liquid are stopped simultaneously. The lean liquid in the liquid accumulation bed 501 seeps down through the side wall of the porous sintered tube 6 and the partition plate 5, forming droplets that enter the third purification zone 105. The residual gas to be purified in the liquid phase bed undergoes mass transfer sequentially through the liquid phase bed, the droplets in the third purification zone 105, the liquid accumulation bed 501, the small droplets in the second purification zone 104, and the gas-liquid adsorption bed, thus avoiding the waste of the lean liquid.

[0043] The above are the basic embodiments of the present invention. Further improvements, optimizations, and limitations can be made based on the above to obtain the following embodiments:

[0044] Example 2

[0045] This embodiment is an improvement on embodiment 1. Its main structure is the same as that of embodiment 1. The improvement is that a second trap 106 is provided in the first purification zone 103 above the pressure nozzle 2. The droplets ejected from the pressure nozzle 2 have a small mass and may be carried away by the upward airflow. Therefore, a second trap 106 is provided above the pressure nozzle 2 to adsorb the lean liquid in the gas and reduce the waste of lean liquid.

[0046] Example 3

[0047] This embodiment is an improvement on Embodiment 1. Its main structure is the same as Embodiment 1, but the improvement lies in that each porous sintered tube 6 has an elastic sheet 7 at its top end. One end of the elastic sheet 7 extends to the gas-liquid channel 601, and the other end extends to the liquid accumulation bed 501. The connection between the elastic sheet 7 and the porous sintered tube 6 is either a fixed connection or a hinged connection.

[0048] When the elastic sheet 7 is hinged to the porous sintered tube 6, the center of the elastic sheet 7 is connected to the top of the porous sintered tube 6. The two ends of the elastic element extend to the top of the gas-liquid channel 601 and the top of the liquid accumulation bed 501, respectively. During the operation of the purification device, the droplets from top to bottom impact the upper surface of the elastic element, and the gas from bottom to top impacts the lower surface of the elastic element. When the two ends of the elastic element are not evenly stressed, the elastic sheet 7 will rotate back and forth along its hinge, which will cause the turbulence of the gas and liquid around the elastic sheet 7, further increasing the desulfurization effect. At the same time, the droplets break when they hit the elastic element, which increases the contact area between the droplets and the gas, thereby improving the desulfurization effect.

[0049] When the elastic sheet 7 is fixedly connected to the porous sintered tube 6, the gas flowing out of the gas-liquid channel 601 and the liquid droplets falling from above the elastic sheet 7 will collide with the elastic sheet 7, causing the elastic sheet 7 to vibrate or fluctuate. At the same time, some of the gas escaping from the liquid bed 501 will also collide with the elastic sheet 7, causing it to vibrate or fluctuate, which in turn affects the gas flow state around the elastic sheet 7, increases the degree of gas turbulence, and further enhances the desulfurization effect.

[0050] In this embodiment, the elastic sheet 7 is fixedly connected to the porous sintered tube 6.

[0051] The elastic sheet 7 can be a long strip plate, an S-shape, or an upwardly convex arc. When the elastic sheet 7 is S-shaped or an upwardly convex arc, the turbulence of the gas is greater. In this embodiment, the elastic sheet 7 is a long strip plate.

[0052] Example 4

[0053] This embodiment is an improvement on embodiment 3. Its main structure is the same as that of embodiment 3. The improvement is that the elastic sheet 7 can be set horizontally or inclined. When the elastic sheet 7 is set horizontally, one end of the elastic sheet 7 extends to the opening of the porous sintering tube 6 and the other end extends to the liquid surface of the liquid bed 501. If the elastic sheet 7 is set inclined, the bottom end of the elastic sheet 7 can be located inside or above the liquid bed 501.

[0054] Specifically, such as Figure 2 As shown, the elastic sheet 7 is inclined, and the bottom end of the elastic sheet 7 extends into the liquid accumulation bed 501. The top end of the elastic sheet 7 is located above the gas-liquid channel 601. The droplets falling from top to bottom gather into a liquid flow on the upper surface of the elastic sheet 7 and then flow into the liquid accumulation bed 501. The liquid flow will impact the liquid accumulation bed 501, enhance the turbulence of the lean liquid in the liquid accumulation bed 501, and thus improve the desulfurization effect.

[0055] like Figure 3As shown, the elastic sheet 7 is inclined, with the bottom end of the elastic element located inside the liquid accumulation bed 501 and the top end of the elastic sheet 7 located inside the gas-liquid channel 601. The lean liquid in the liquid accumulation bed 501 will flow along the elastic sheet 7 into the gas-liquid channel 601, instead of simply overflowing downwards along the inner wall of the gas-liquid channel 601. This serves to divert the flow, increase the contact area between the gas and the lean liquid, and improve the desulfurization effect.

[0056] In this embodiment, the elastic sheet 7 is tilted and fixed at the top of the porous sintering tube 6, and the top of the elastic sheet 7 is located above the liquid bed 501, while the bottom of the elastic sheet 7 is located inside the gas-liquid channel 601.

[0057] Example 5

[0058] This embodiment is an improvement on embodiment 3. Its main structure is the same as embodiment 3, but the improvement lies in the following: In this embodiment, the elastic sheet 7 is connected to the top end of the porous sintered tube 6 via a spring 702. Specifically, one end of the spring 702 is connected to the top end of the porous sintered tube 6, and the other end of the spring 702 is fixedly connected to the lower surface of the elastic sheet 7. Figure 4 As shown, when droplets and gas collide with the elastic sheet 7, the elastic sheet 7 will swing up and down and left and right, and at the same time, the elastic sheet 7 will vibrate itself, which will further increase the turbulence of droplets and gas around the elastic sheet 7 and improve the desulfurization effect.

[0059] Example 6

[0060] This embodiment is an improvement on embodiment 3. Its main structure is the same as that of embodiment 3, but the improvement lies in: [The following is a more detailed description of the improvement.] Figure 2 As shown, multiple flexible strips 701 are distributed on the upper and lower surfaces of the elastic sheet 7. The flexible strips 701 are evenly spaced on the surface of the elastic sheet 7. When gas blows across the flexible strips 701 or liquid droplets hit the flexible strips 701, the flexible strips 701 will swing, thereby enhancing the turbulence around them and further enhancing the desulfurization effect of the gas.

[0061] Example 7

[0062] This embodiment is an improvement on embodiment 4. Its main structure is the same as that of embodiment 4, but the improvement lies in: [The following is a more detailed description of the improvement.] Figure 3 As shown, multiple flexible strips 701 are distributed on the upper and lower surfaces of the elastic sheet 7. The flexible strips 701 are evenly spaced on the surface of the elastic sheet 7. When gas blows across the flexible strips 701 or liquid droplets hit the flexible strips 701, the flexible strips 701 will swing, thereby enhancing the turbulence around them and further enhancing the desulfurization effect of the gas.

[0063] Meanwhile, during the flow diversion process of the elastic sheet 7, the lean liquid will fall along the different flexible strips 701, which will disperse the overflowed lean liquid, increase the contact area between the gas and the lean liquid, and thus improve the desulfurization effect.

[0064] Example 8

[0065] A multi-bed gas purification system includes a purification device and a regeneration tower. The purification device is any of the purification devices described in embodiments 1-4 above. The pressure nozzle 2 and the rich liquid outlet 102 are both connected to the regeneration tower. The rich liquid at the bottom of the purification reactor 1 is regenerated into a lean liquid by the regeneration tower, and the lean liquid is sprayed into the purification reactor 1 through the pressure nozzle 2.

[0066] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A multi-bed gas purification device, comprising a vertical purification reactor (1), wherein a rich liquid outlet (102) is provided at the bottom of the purification reactor (1), an exhaust pipe (101) for discharging purified gas is provided at the top of the purification reactor (1), a pressure nozzle (2) for injecting lean liquid into the purification reactor (1) is provided at the top of the purification reactor (1), and a first microbubble generator (3) for introducing the gas to be purified into the purification reactor (1) is provided at the bottom of the purification reactor (1), characterized in that: The purification reactor (1) is equipped with a first trap (4) and a partition plate (5) arranged from top to bottom, thereby dividing the inner cavity of the purification reactor (1) into a first purification zone (103), a second purification zone (104), and a third purification zone (105) from top to bottom. The partition plate (5) is provided with a plurality of porous sintered tubes (6) extending to the second purification zone (104), and the porous sintered tubes (6) are open at both ends to form a gas-liquid channel (601) connecting the second purification zone (104) and the third purification zone (105). The pressure nozzle (2) is located in the first purification zone. (103) After the lean liquid is sprayed out through the pressure nozzle (2), it first enters the first trap (4) and forms a gas-liquid adsorption bed. Then, part of it accumulates on the partition plate (5) to form a liquid bed (501), and the other part, together with the overflow of the liquid bed (501), passes through the gas-liquid channel (601) and forms a liquid bed in the third purification zone (105). The first microbubble generator (3) is located in the liquid bed. The exhaust pipe (101) is connected to a return pipe (8) that returns part of the purified gas to the liquid bed (501) and forms microbubbles.

2. The multi-bed gas purification device as described in claim 1, characterized in that: The first trap (4) includes two pressure plates arranged laterally in the purification reactor (1), a filling area is formed between the two pressure plates, the filling area is filled with metal wires, and gas-liquid mass transfer gaps are formed between the metal wires.

3. The multi-bed gas purification device as described in claim 1, characterized in that: The partition plate (5) and the porous sintered tube (6) are made of porous ceramic material.

4. The multi-bed gas purification device as described in claim 1, characterized in that: One end of the return pipe (8) is connected to the side wall of the exhaust pipe (101), and the other end of the return pipe (8) is connected to multiple branch pipes. The end of the branch pipe is provided with a second microbubble generator (801) located in the liquid accumulation bed (501).

5. The multi-bed gas purification device as described in claim 1, characterized in that: A second trap (106) is provided in the first purification zone (103) above the pressure nozzle (2).

6. The multi-bed gas purification device as described in claim 1, characterized in that: Each of the porous sintered tubes (6) is provided with an elastic sheet (7) at its top end. One end of the elastic sheet (7) extends to the gas-liquid channel (601), and the other end of the elastic sheet (7) extends to the liquid accumulation bed (501).

7. The multi-bed gas purification device as described in claim 6, characterized in that: Multiple flexible strips (701) are distributed on the upper and lower surfaces of the elastic sheet (7).

8. The multi-bed gas purification device as described in claim 6, characterized in that: The elastic sheet (7) is inclined, with its top end located above the liquid bed (501) and its bottom end located inside the gas-liquid channel (601).

9. A multi-bed gas purification device as described in claim 6, characterized in that: The elastic sheet (7) is S-shaped or an upwardly convex arc.

10. A multi-bed gas purification system, comprising a purification device and a regeneration tower, characterized in that: The purification device is the purification device described in any one of claims 1-9. The pressure nozzle (2) and the rich liquid outlet (102) are both connected to the regeneration tower. The rich liquid at the bottom of the purification reactor (1) is regenerated into a lean liquid by the regeneration tower, and the lean liquid is sprayed into the purification reactor (1) through the pressure nozzle (2).

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