Purification tower and purification method for organic waste pyrolysis gas

Abstract

The invention belongs to the technical field of impurity gas removal, and relates to a purification tower and a purification method for organic waste pyrolysis gas. The purification tower is divided into an air inlet section, an absorption section, an ascending section and an exhaust section from bottom to top; a nozzle is arranged in the air inlet section; the nozzle is connected with a liquid storage tank; absorption liquid is stored in the liquid storage tank; the absorption section comprises a venturi contraction section, a venturi throat part, a venturi expansion section and a plurality of expansion section conical rings which are sequentially connected from bottom to top; a shell is arranged outside the absorption section, and a cavity area between the absorption section and the bottom of the shell forms a liquid gathering groove; the liquid gathering tank is connected with the liquid storage tank; the bottom of the upper expansion section conical ring is connected with the top of the lower expansion section conical ring, and a liquid flowing circular seam is prefabricated at the joint; a cavity area formed by the plurality of expansion section conical rings and the shell is an annular space; and a demister is arranged at the top of the ascending section. The problem that the efficiency of removing harmful gas and dust in waste gas is always contradictory to each other at low cost is solved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of impurity gas removal, and particularly relates to a purification tower and purification method for organic waste pyrolysis gas. BACKGROUND

[0002] With the improvement of urbanization process and consumption level, the output of household garbage, sludge, agricultural waste, industrial organic waste and the like increases substantially, and the traditional landfill and incineration mode causes problems such as land resource shortage and NIMBY effect. In addition, a large amount of leachate and greenhouse gas methane (CH4) is generated by landfill of organic waste; and toxic substances such as dioxin are generated by open-air incineration, polluting the atmosphere. In order to develop green low-carbon circular economy, pyrolysis technology has become an important technical path for pollution reduction and carbon reduction synergies, which can convert carbon elements in waste into combustible gas and stable carbon sequestration (biochar) to replace fossil fuels, realize carbon recycling, and realize energy and resource utilization of organic waste.

[0003] Organic waste (such as wood chips, straw, household garbage, sludge, plastic and the like) is heated (usually at 500-800°C) under anoxic conditions, and thermal decomposition occurs to produce pyrolysis gas including hydrogen (H2), carbon monoxide (CO), methane (CH4), carbon dioxide (CO2) and other small amounts of hydrocarbons (such as C2H4 and the like). These pyrolysis gases can be used as fuel, for power generation, for preparing synthesis gas and other chemical raw material gas, and have important significance for the development of organic waste pyrolysis gas in the direction of large-scale, integration and high value.

[0004] Compared with the traditional incineration treatment mode, the organic waste pyrolysis process has the advantages of better pollution control and higher product value. Since the pyrolysis process is carried out in anoxic or anoxic environment, the generation of dioxin and nitrogen oxides (NO x ) can be effectively inhibited from the source. The pyrolysis gas not only can produce heat and generate electricity, but also is an important raw material gas for extracting synthesis gas to prepare methanol. However, the impurity gases CO2 and SO2 contained in the pyrolysis gas often affect the quality of the raw material gas, and the removal and purification of the impurity gases from the organic pyrolysis gas have important research value for improving the quality of the synthesis gas.

[0005] Although the existing technology has disclosed a high-temperature flue gas purification tower, however, a wire mesh plate, a pipe grid and a sieve hole tray are installed in the rectangular spray tower, and the spray water flows through the pores to form a liquid film to remove the dust in the flue gas flowing through the liquid film. When the spray water flows through the pores and contacts the liquid film, part of the flue gas cannot contact the liquid film and leaves the spray tower, and the dust and waste gas carried by the flue gas are taken out of the spray tower, resulting in a decrease in the dust removal efficiency. Increasing the number of hole plates and grids to improve the dust and waste gas removal efficiency in the flue gas will increase the cost of the spray device. Therefore, there is a contradiction between improving the removal efficiency of harmful gases and dust in the waste gas at a lower cost. Summary of the Invention

[0006] The purpose of this invention is to provide a purification tower and purification method for pyrolysis gas of organic waste, which solves the contradictory problem of improving the removal efficiency of harmful gases and dust in waste gas at a lower cost.

[0007] This invention is achieved through the following technical solution: This invention discloses a purification tower for pyrolysis gas of organic waste, comprising a tower body, which is divided into an inlet section, an absorption section, an ascending section and an exhaust section from bottom to top; The air inlet section is equipped with an air inlet port for the flue gas to be treated to enter, and a nozzle is installed inside the air inlet section; the nozzle is connected to a liquid storage tank; the liquid storage tank stores absorbent liquid. The absorption segment, from bottom to top, includes the Venturi contraction segment, the Venturi throat, the Venturi expansion segment, and multiple expansion segment conical rings connected in sequence; The absorption section is surrounded by an outer shell, and the cavity area between the absorption section and the bottom of the outer shell forms a liquid collection tank; the liquid collection tank is connected to a storage tank for returning the waste liquid; The taper of multiple expansion segment conical rings increases sequentially from bottom to top, forming a gradient conical surface; the bottom of the upper expansion segment conical ring is connected to the top of the lower expansion segment conical ring, and a pre-fabricated flow annular gap is provided at the connection point; the cavity region formed by the multiple expansion segment conical rings and the outer shell is an annular gap; A demister is installed at the top of the ascending section.

[0008] Furthermore, the absorbent is an ammonia absorbent with added KOH; the amount of KOH added is 20%~32%.

[0009] Furthermore, the demister uses a corrugated plate to form a corrugated channel.

[0010] Furthermore, the bottom of the liquid pool is prefabricated with a liquid outlet, which is connected to the storage tank through a return pipe.

[0011] Furthermore, the storage tank is connected to the nozzle via a delivery pipe; multiple nozzles are provided and arranged in a ring array on the distribution pipe, and an absorbent inlet pipe is connected to one side of the distribution pipe. The delivery pipe is connected to the absorbent inlet pipe.

[0012] Furthermore, the ratio of the height to the diameter of the Venturi throat is 20-25:1.

[0013] Furthermore, a plurality of inner and outer shell connecting plates are provided between the expansion section conical ring and the outer shell.

[0014] This invention also discloses a purification method for a purification tower used for pyrolysis gas of organic waste, comprising the following processes: The flue gas to be treated enters through the inlet port, and at the same time, the absorbent liquid is delivered from the infusion tank to the nozzle, and the liquid mist sprayed out through the nozzle comes into contact with the flue gas. The liquid mist is carried by the upward flue gas flow and enters the Venturi contraction section, Venturi throat and Venturi expansion section in sequence. In the Venturi throat section, the narrow channel allows the liquid mist to come into full contact with the flue gas to be treated, and SO2 and CO2 are fully absorbed by the liquid mist. Then it enters the expansion section cone ring, the flue gas velocity decreases, the water mist is separated from the flue gas under the action of gravity and drips onto the inner wall of the expansion section cone ring, and the waste liquid flows from the liquid flow ring gap into the ring gap and finally slides into the liquid collection tank. The waste liquid is returned to the storage tank.

[0015] Furthermore, the temperature of the absorbent is set to 5~12℃.

[0016] Furthermore, the flow rate ratio of absorbent liquid to flue gas is set to 2~3L:1m³. 3 .

[0017] Compared with the prior art, the present invention has the following beneficial technical effects: This invention discloses a purification tower for pyrolysis gas from organic waste. The tower body is divided into an inlet section, an absorption section, an ascending section, and an exhaust section from bottom to top. This segmented design achieves multi-stage purification of the pyrolysis gas from organic waste. The inlet section is equipped with nozzles connected to a storage tank, allowing the absorbent liquid to initially contact the flue gas at the inlet for pre-absorption. The absorption section employs a Venturi structure (contraction section, throat, and expansion section) and multiple conical rings for the expansion sections. The inlet port is located at the bottom, facilitating the upward flow of the hot gas stream by its own buoyancy, reducing the power consumption for transporting the pyrolysis gas stream. Simultaneously, the pyrolysis gas comes into contact with the ejected liquid mist, facilitating the rapid absorption of SO2 and CO2 from the flue gas by the liquid mist. The nozzles spray the prepared absorbent liquid into a uniform mist. This mist is carried by the upward-flowing flue gas into the Venturi contraction section, the Venturi throat, and the Venturi expansion section. Particularly in the Venturi throat, the narrow channel facilitates full contact between the mist and the flue gas being treated, ensuring thorough absorption of SO2 and CO2 by the absorbent liquid. Furthermore, the limited space in the throat effectively suppresses ammonia escape. Above the Venturi expansion section, conical rings are arranged to significantly enlarge the expansion area, causing a decrease in flue gas velocity. This reduces the flue gas velocity to the point that it cannot sustain the water mist it carries. Under gravity, the water mist detaches from the flue gas and drips onto the inner wall of the conical rings. It then flows into the annular gaps through the liquid flow grooves of these rings and finally slides into the collection tank. The tapered gradient design of multiple expansion rings gradually reduces the flue gas velocity, facilitating droplet separation under gravity. The collection tank and the storage tank form a circulation system, enabling the recycling of the absorbent liquid and reducing operating costs. The demister is located at the top of the rising section to effectively remove liquid droplets entrained in the flue gas, ensuring that the emissions meet standards. Due to the use of a Venturi tube and a flow pattern in which the absorbent and organic waste gas are in the same direction at the throat, the Venturi effect enhances the gas-liquid mixing and absorption effect. This improves the absorption efficiency of low-concentration solvents for CO2 and other waste gases, effectively reducing solvent usage and lowering costs while achieving the target waste gas absorption rate.

[0018] Furthermore, it is recommended that the amount of KOH added to the mixed absorbent be 20% to 32%, which will result in a 25.8% to 36.6% higher waste gas removal effect than that of pure KOH solution and pure ammonia solution.

[0019] Furthermore, due to the Venturi effect, the absorption rate of low-concentration KOH-ammonia solution for waste gases such as CO2 is effectively improved, reducing the number of absorption liquid cycles to 10 times, which is 67% less than that of conventional equal-diameter packed spray towers. Under the premise of achieving the target waste gas absorption capacity, the operating cost is effectively reduced, including the power cost provided by the circulating pump, electricity cost, labor maintenance cost, and consumption cost of absorbent and absorption liquid.

[0020] Furthermore, the ratio of the throat's height to its diameter is 20-25 to ensure that the organic waste gas and the spray absorption liquid have sufficient time to react chemically, promoting the absorption liquid to fully absorb and remove harmful gases from the organic waste gas. A ratio that is too large will lead to material waste and increased costs, while a ratio that is too small will cause a decrease in removal efficiency, resulting in the waste gas removal failing to meet standards.

[0021] Furthermore, during operation, the supply of absorbent liquid can be adjusted by regulating the valve on the storage tank to achieve the optimal gas-liquid ratio for different organic waste gas flow rates.

[0022] Furthermore, the demister uses corrugated plates to form corrugated channels, which facilitates the removal of mist droplets carried by the treated flue gas during the turbulence process inside the channel under the action of inertial force. These mist droplets will adhere to the corrugated plates, slide down to the absorption section under the action of gravity, and accumulate in the liquid collection tank, and be introduced into the liquid storage tank by the return pipe.

[0023] Furthermore, the temperature of the absorbent is set to 5~12℃ to prevent ammonia from escaping from the absorbent, thereby minimizing the escape of ammonia.

[0024] Furthermore, the flow rate ratio of absorbent to flue gas is set to: 2~3L (KOH-ammonia solution) / m³. 3 (Flue gas). Due to the use of ammonia solution with added KOH, the gas-liquid ratio can be reduced by 33-50% compared to conventional pure ammonia solution, effectively improving the power cost of the absorbent and increasing the absorption efficiency of the absorbent. Attached Figure Description

[0025] Figure 1 This is a front view of a purification tower for organic waste pyrolysis gas according to the present invention. Figure 2 for Figure 1 Enlarged view of section I in the middle; Figure 3 for Figure 2 Enlarged view at point II; Figure 4 This is an isometric view of the absorption section; Figure 5 for Figure 1 The enlarged view at point I shows another type of nozzle injection structure; Figure 6 for Figure 5 Axonometric drawing.

[0026] Explanation of icon numbers: 1. Air inlet port; 2. Air inlet section; 3. Nozzle; 4. Absorption section; 5. Tower body; 6. Demister; 7. Exhaust section; 8. Treated flue gas; 9. Storage tank; 10. Delivery pipe; 11. Absorbent liquid; 12. Return pipe; 13. Waste liquid; 31. Absorbent liquid inlet pipe; 32. Distribution pipe; 41. Venturi contraction section; 42. Liquid collection tank; 43. Venturi throat; 44. Venturi expansion section; 45. Expansion section conical ring; 46. Inner and outer shell connecting plate; 47. Outer shell; 48. Annular gap; 49. Flow annular gap. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the present invention clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention; that is, the described embodiments are only a part of the embodiments of the present invention, and not all of them.

[0028] The detailed description of the embodiments of the present invention provided in the following figures is not intended to limit the scope of the claimed invention, but merely to illustrate one selected embodiment of the invention. All other embodiments obtained by those skilled in the art based on the figures and embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0029] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0030] like Figure 1 As shown, the purification tower for the gas products of organic waste pyrolysis gasification according to the present invention includes a tower body 5, which is divided into an inlet section 2, an absorption section 4, an ascending section and an exhaust section 7 from bottom to top. The intake section 2 is provided with an intake port 1 for the flue gas to be treated. A nozzle 3 is arranged inside the intake section 2. A demister 6 is provided at the top of the rising section. The treated flue gas 8 is discharged from the end of the exhaust section 7. A conveying pipe 10 is installed on the left side of the nozzle 3. The absorbent liquid 11 flowing inside the conveying pipe 10 leads to the nozzle 3. A return pipe 12 is installed on the left side of the absorption section 4. The return pipe 12 sends the waste liquid 13 into the storage tank 9.

[0031] like Figures 2-4As shown, the absorption section 4 is configured as a Venturi structure, specifically including a Venturi contraction section 41, a Venturi throat 43, a Venturi expansion section 44, and an expansion section conical ring 45 connected sequentially from bottom to top. A shell 47 is provided around the Venturi throat 43 and the Venturi expansion section 44. A liquid collection groove 42 is formed in the cavity area between the absorption section 4 and the bottom of the shell 47. The cavity area formed by the multiple expansion section conical rings 45 and the shell 47 is an annular gap 48. An inner and outer shell connecting plate 46 is provided between the expansion section conical rings 45 and the shell 47. There is a liquid flow annular gap 49 inside the inner and outer shell connecting plate 46.

[0032] The inner and outer shell connecting plate 46 enhances the structural strength and stability of the tower body 5. The inner and outer shell connecting plate 46 securely connects the expansion section conical ring 45 to the outer shell 47, preventing vibration and deformation under high-speed airflow. Multiple inner and outer shell connecting plates 46 are evenly distributed along the height of the tower body 5, forming a stable support structure and improving the service life of the equipment. At the same time, it does not significantly affect airflow, ensuring the purification effect.

[0033] The tower body 5 can be made of 1-2mm thick stainless steel plate. During the flow of the treated flue gas 8 inside the tower body 5, some of the liquid droplets carried can still fall off due to insufficient power, slide from the inner wall of the expansion section conical ring 45 into the annular gap 48, and finally fall into the liquid collection tank 42. In order to make its liquid removal effect good and facilitate connection with other containers, the height of the tower body 5 can be set according to the place where the treated flue gas is introduced, and it is recommended not less than 2.5-3m.

[0034] Figure 2 In the process, the ratio of the height 'a' to the diameter 'Фb' of the Venturi throat 43 is 20-25, ensuring that the organic waste gas and the spray absorption liquid 11 have sufficient time to react chemically, promoting the absorption liquid 11 to fully absorb and remove the harmful gases from the organic waste gas. A ratio that is too large will result in material waste and increased costs, while a ratio that is too small will cause a decrease in removal efficiency, leading to the waste gas removal failing to meet standards.

[0035] Even better, such as Figures 5-6 As shown, the conveying pipe 10 is connected to the absorbent inlet pipe 31, and the absorbent inlet pipe 31 and the distribution pipe 32 are connected to each other. A nozzle 3 is installed on the distribution pipe 32. When the absorbent 11 enters the absorbent inlet pipe 31, it flows through the distribution pipe 32 and is sprayed out from the nozzle 3 to form droplets. After contacting the flue gas to be treated, the flue gas to be treated flows upward to the tower body 5. The waste liquid 13, which has absorbed CO2 and SO2 gases after contacting the flue gas, flows from the liquid flow annular gap 49 through the annular gap 48 into the liquid collection tank 42, and then flows out from the return pipe 12.

[0036] Multiple nozzles 3 are arranged in a ring array on the liquid distribution pipe 32, and the liquid is supplied through the absorbent inlet pipe 31. The ring array arrangement of multiple nozzles 3 ensures that the absorbent 11 is evenly distributed on the cross-section of the air inlet section 2, avoiding spray dead zones and ensuring full contact between the flue gas and the absorbent 11. The connection between the liquid distribution pipe 32 and the absorbent inlet pipe 31 is simple and reliable, facilitating installation and maintenance. The delivery pipe 10 is connected to the absorbent inlet pipe 31, forming a complete liquid supply circuit to ensure stable system operation.

[0037] The purification method for a purification tower used for pyrolysis gas of organic waste includes the following processes: The flue gas to be treated enters through the inlet port 1. At the same time, the absorbent liquid 11 is transported from the infusion tank 9 to the nozzle 3. The liquid mist sprayed out through the nozzle 3 comes into contact with the flue gas. The liquid mist is carried by the upward flue gas flow and enters the Venturi contraction section 41, the Venturi throat 43, and the Venturi expansion section 44 in sequence. In the Venturi throat section 44, the narrow channel allows the liquid mist and the flue gas to be treated to come into full contact, and SO2 and CO2 are fully absorbed by the liquid mist. Then, it enters the expansion section cone ring 45, where the flue gas velocity decreases. Water mist is separated from the flue gas under the action of gravity and drips onto the inner wall of the expansion section cone ring 45. The waste liquid flows from the liquid flow ring gap into the ring gap 48 and finally slides into the liquid collection tank 42. The waste liquid 13 is returned to the liquid storage tank 9.

[0038] This purification method achieves highly efficient purification of organic waste pyrolysis gas through a multi-stage purification process. The flue gas and absorbent liquid 11 come into full contact at the Venturi throat 43, where high-speed airflow enhances mass transfer, allowing SO2 and CO2 to be rapidly absorbed. The gradient conical surface design of the expansion section conical ring 45 gradually reduces the flue gas velocity, effectively separating droplets under gravity. The spent liquid 13 flows into the annular gap 48 through the flow ring slit 49 and is ultimately returned to the storage tank 9 for recycling, achieving zero discharge of the absorbent liquid 11. The entire process is simple, easy to operate, highly efficient, and has low operating costs, making it suitable for industrial applications.

[0039] Example 1 This device and method are used to remove waste gas emitted from a wet-process phosphoric acid production plant. The waste gas contains pollutants including fluorides, sulfur dioxide, and acidic mist. The flow rate ratio of waste gas to absorbent liquid 11 is 2.5 L / m³. 3The temperature of the absorbent 11 is 8~10℃; the absorbent is ammonia solution with 23% KOH added; the mass concentration of the absorbent is 3%~5%; the absorbent 11 is circulated 10 times, and the absorption efficiency of fluoride is 96%~97.8%; the absorption efficiency of sulfur dioxide is 95%~97%; the absorption efficiency of acid mist is 95%~96.7%; compared with the traditional spray tower for removing waste gas, the removal rate is increased by 15.6%~30.4%, the number of cycles is reduced by 52.3%, and the operating cost is saved by 30.2%~37%.

[0040] Example 2 This device and method are used to remove organic waste gas emitted from rubber factories. The pollutants contained in this gas include methanethiol, ethanethiol, carbon disulfide, chloromethane, and dichloroethane, with a content of 20% to 25%. The flow ratio of organic waste gas to absorbent liquid 11 is 3 L / m³. 3 The temperature of absorbent 11 is 6~8℃; the absorbent is ammonia solution containing 28% KOH; the mass concentration of the absorbent is 3%~5%; the absorption liquid 11 is circulated 12 times; the absorption efficiency of methanethiol is 95.6~97.5%; the absorption efficiency of ethanethiol is 92~93%; the absorption efficiency of carbon disulfide is 95~97%; the absorption efficiency of chloromethane is 96~97%; and the absorption efficiency of dichloroethane is 93~94%. Compared with the traditional spray tower for removing organic waste gas, the removal rate is increased by 15.6~30.4%, the number of cycles is reduced by 52.3%, and the operating cost is saved by 30.2%~37%; the ammonia escape is 10~20ppm, which is reduced by 93~96%.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the protection scope of the present invention.

Claims

1. A purification tower for pyrolysis gas of organic waste, characterized in that, The tower body (5) is divided into an air inlet section (2), an absorption section (4), an ascending section and an air outlet section (7) from bottom to top. The air inlet section (2) is provided with an air inlet port (1) for the flue gas to be treated to enter, and the air inlet section (2) is internally provided with a nozzle (3); the nozzle (3) is connected with a liquid storage tank (9); the liquid storage tank (9) stores an absorption liquid (11); The absorption section (4) comprises, from bottom to top, a Venturi converging section (41), a Venturi throat (43), a Venturi diverging section (44) and a plurality of diverging section cone rings (45) connected in sequence. The absorption section (4) is externally provided with an outer shell (47), and a cavity region between the absorption section (4) and the bottom of the outer shell (47) forms a liquid collecting groove (42); the liquid collecting groove (42) is connected with the liquid storage tank (9) and used for backflow of the liquid (13). The taper of the plurality of diverging section cone rings (45) increases from bottom to top, forming a gradient taper surface; the bottom of the diverging section cone ring (45) located at the upper side is connected with the top of the diverging section cone ring (45) located at the lower side, and a liquid flow ring gap (49) is preformed at the connection; the cavity region formed by the plurality of diverging section cone rings (45) and the outer shell (47) is a ring gap (48). The top of the ascending section is provided with a demister (6).

2. A purification tower for pyrolysis gas of organic waste according to claim 1, characterized in that, The absorption liquid (11) is ammonia water absorption liquid with KOH added. The amount of KOH added is 20% to 32%.

3. A purification tower for pyrolysis gas of organic waste according to claim 1, characterized in that, The demister (6) adopts a corrugated plate to form a corrugated channel.

4. A purification tower for pyrolysis gas of organic waste according to claim 1, characterized in that, The bottom of the liquid collecting groove (42) is preformed with a liquid outlet hole, and the liquid outlet hole is connected to the liquid storage tank (9) through a backflow pipe (12).

5. A purification tower for pyrolysis gas of organic waste according to claim 1, characterized in that, The liquid storage tank (9) is connected to the nozzle (3) through a conveying pipe (10); the nozzle (3) is provided with a plurality of nozzles and arranged in a ring array on a liquid distribution pipe (32), and one side of the liquid distribution pipe (32) is connected with an absorption liquid inlet pipe (31); The conveying pipe (10) is connected with the absorption liquid inlet pipe (31).

6. A purification tower for pyrolysis gas of organic waste according to claim 5, characterized in that, The height to diameter ratio of the Venturi throat (43) is 20 to 25:

1.

7. A purification tower for pyrolysis gas of organic waste according to claim 1, characterized in that, A plurality of inner and outer shell connecting plates (46) are arranged between the diverging section cone rings (45) and the outer shell (47).

8. A purification method for a purification column for pyrolysis gas of organic waste according to any one of claims 1 to 7, characterized in that, The following processes are included: The flue gas to be treated enters through the air inlet port (1), and at the same time, the absorption liquid (11) is conveyed from the liquid storage tank to the nozzle (3), and the liquid mist sprayed out of the nozzle (3) contacts the flue gas; The liquid mist is carried by the flue gas flowing upwards into the Venturi converging section (41), the Venturi throat (43) and the Venturi diverging section (44) in sequence, in the Venturi throat section, the narrow channel enables the liquid mist and the flue gas to be treated to fully contact, and SO2 and CO2 are fully absorbed by the liquid mist; Then, the flue gas enters the diverging section cone ring (45), the flue gas flow rate decreases, the water mist is separated from the flue gas under the action of gravity, and drops on the inner wall surface of the diverging section cone ring (45), the liquid (13) flows into the ring gap (48) from the liquid flow ring gap, and finally slides into the liquid collecting groove (42); The liquid (13) is backflowed into the liquid storage tank (9).

9. A purification method for a purification column for pyrolysis gas of organic waste according to claim 8, characterized in that, The temperature of the absorption liquid (11) is set to 5 to 12℃.

10. The purification method of claim 8, wherein the purification method is characterized by, The flow ratio of the absorption solution (11) and the flue gas is set to 2 to 3 L: 1 m 3 .

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