A cyclone gas-liquid separation device for VOCs waste gas recovery treatment

Abstract

The utility model relates to a cyclone gas-liquid separation device for VOCs waste gas recovery and treatment, including gas-liquid separation pipe and condensing heat exchange mechanism, the upper pipe department of U -shaped pipe's gas-liquid separation pipe is worn and is taken out the air inlet of box body one side upper part, the export of lower pipe department is located at the airflow orifice department of the baffle lower part in the box body, and the airflow orifice on the baffle is communicated with the front treatment bin and rear treatment bin, and the inner wall of gas-liquid separation pipe is equipped with the spiral flow guide plate with the drain hole bottom, and condensing heat exchange mechanism includes front refrigerant inlet pipe, jacket pipe and front refrigerant outlet pipe, and the outer periphery of gas-liquid separation pipe is sealed with jacket pipe, and front refrigerant inlet pipe is connected with front refrigerant outlet pipe through jacket pipe and is communicated, and the interface of front refrigerant inlet pipe and the interface of front refrigerant outlet pipe are set up in the outside of box body, and the low part of the box bottom plate of box body is obliquely arranged and is equipped with the drain pipe. The utility model has the advantages of simple structure, the effect of turbulent flow is increased to the waste gas cyclone collision, prolongs the path of waste gas to carry out organic liquid phase recovery, and can improve the gas-liquid dynamic separation efficiency.

Description

Technical Field

[0001] This utility model relates to a cyclone gas-liquid separation device for VOCs waste gas recovery and treatment, belonging to the field of volatile organic compound gas treatment technology. Background Technology

[0002] VOCs, or Volatile Organic Compounds, are a class of organic compounds that emit organic gases. The composition of VOCs waste gas is very complex. For VOCs waste gas containing organic compounds such as alcohols, aldehydes, and benzene, technologies such as combustion, adsorption, and condensation are commonly used.

[0003] Condensation-based VOCs recovery utilizes a condenser to generate low temperatures, thereby reducing the temperature of the VOCs-air mixture. While indirect heat transfer between the waste gas and refrigerant surface is less efficient than direct contact between the waste gas and refrigerant, it offers advantages in terms of installation, operation, and maintenance costs. Therefore, condensers are currently the preferred equipment for treating high-concentration VOCs waste gas.

[0004] Existing VOCs waste gas recovery and treatment equipment uses vertically placed heat exchangers and shells. However, the contact area between the waste gas and the heat exchange tube bundle inside the heat exchanger shell is limited, and the heat exchange path is short. Furthermore, the treatment efficiency is not high when using liquid nitrogen as the refrigerant. Therefore, multi-stage condensation is often used in the treatment system, which not only increases production costs but also occupies a large space.

[0005] To improve processing efficiency, a device for treating volatile organic compounds (VOCs) gases, such as the one disclosed in CN214862319U, includes a vertically arranged shell and a heat exchange mechanism disposed within the shell. An upper tube sheet and a lower tube sheet are disposed within the shell to fix the heat exchange mechanism, forming a heat exchange chamber. A first inlet for VOCs gas is disposed on the upper side of the heat exchange chamber, and a first outlet for VOCs gas is disposed on the lower side of the heat exchange chamber. An oil outlet pipe for condensed oil is disposed on the bottom side of the heat exchange chamber. The lower tube sheet is inclined towards the oil outlet pipe. A vertical spiral heat exchange tube serves as the oil separation structure. Under the combined action of gravity and the spiral pipe, the condensate can be smoothly condensed on the outer wall of the spiral heat exchange tube, resulting in smooth oil return at low temperatures, and the condensate can flow out automatically. Although the heat exchange area is increased by the spiral pipe, the exhaust gas still suffers from a short airflow path and low turbulence efficiency as it flows from top to bottom. Summary of the Invention

[0006] The purpose of this invention is to provide a cyclone gas-liquid separation device for VOCs waste gas recovery and treatment that has a simple structure, increases turbulence by cyclone collision with waste gas, extends the path for organic matter recovery from waste gas in the liquid phase, and improves the dynamic separation efficiency of gas and liquid.

[0007] The technical solution of this utility model to achieve the above-mentioned objective is: a cyclone gas-liquid separation device for VOCs waste gas recovery and treatment, characterized in that: it includes a box with a pretreatment chamber, a gas-liquid separation pipe and a condensation heat exchange mechanism disposed in the pretreatment chamber, wherein the gas-liquid separation pipe is a U-shaped pipe, including an upper pipe section, a lower pipe section and an arc-shaped pipe section connecting the upper pipe section and the lower pipe section, the air inlet side of the upper pipe section extends out of the air inlet port on the upper part of one side of the box, and the outlet of the lower pipe section is located at the airflow orifice at the lower part of the partition plate inside the box, the airflow orifice on the partition plate is connected to the pretreatment chamber and the post-treatment chamber. The gas-liquid separation pipe has a spiral guide plate on its inner wall to rotate and guide the waste gas entering the pipe and generate turbulence during collision. The bottom of the spiral guide plate has a drain hole. The condensation heat exchange mechanism includes a front refrigerant inlet pipe, a jacketed pipe, and a front refrigerant outlet pipe. The jacketed pipe is sealed on the outer periphery of the gas-liquid separation pipe. The front refrigerant inlet pipe is connected to the inlet of the jacketed pipe, and the outlet on the jacketed pipe is connected to the front refrigerant outlet pipe. The interfaces of the front refrigerant inlet pipe and the front refrigerant outlet pipe are located outside the housing. The bottom of the inclined bottom plate of the housing has a drain pipe.

[0008] This invention features a gas-liquid separation pipe and a condensation heat exchange mechanism within the pretreatment chamber. The gas-liquid separation pipe is a vertical U-shaped pipe with a spiral guide plate inside. VOCs waste gas with a certain pressure and temperature is introduced into the gas-liquid separation pipe. Under the action of the spiral guide plate, the waste gas forms a vortex and is collided to form a highly efficient turbulent flow, significantly extending the path for the waste gas to recover organic matter in the liquid phase. The waste gas generates turbulence and forms liquid particles during rotation and collision. Under the action of centrifugal separation effect, the liquid particles are accelerated to aggregate and settle under their own weight to achieve gas-liquid separation, transferring the organic matter in the waste gas to the liquid phase. This invention features a jacketed tube outside the gas-liquid separation pipe. By introducing a refrigerant into the jacketed tube, the waste gas passing through the gas-liquid separation pipe undergoes heat exchange and condensation. The waste gas condenses through rotation and collision, extending the waste gas's path and heat exchange time, optimizing the smoke flow path, enhancing turbulence efficiency, and effectively converting organic matter in the waste gas into a liquid phase, thus improving the liquid phase conversion efficiency of the waste gas indirect contact with the refrigerant. The casing of this invention uses an inclined bottom plate, enabling non-powered directional liquid collection and guidance. Liquid organic matter accumulates at the bottom plate and is discharged through a drain pipe or recycled. This invention also features a vertically mounted heat exchange coil in the pretreatment chamber, connected to the jacketed tube. Therefore, the waste gas discharged from the gas-liquid separation pipe continues to undergo heat exchange and condensation in the pretreatment chamber for gas-liquid separation, further increasing the heat exchange area within a limited space and improving the dynamic gas-liquid separation effect. Attached Figure Description

[0009] The embodiments of this utility model will now be described in further detail with reference to the accompanying drawings.

[0010] Figure 1 This is a schematic diagram of the cyclone gas-liquid separation device for VOCs waste gas recovery and treatment according to this utility model.

[0011] Figure 2 yes Figure 1 A schematic diagram of the AA cross-sectional structure.

[0012] Figure 3 yes Figure 2 Schematic diagram of the BB cross-section structure.

[0013] Figure 4 yes Figure 2 A schematic diagram of the CC cross-section structure.

[0014] Wherein: 1—Gas-liquid separation pipe, 1-1—Upper pipe section, 1-2—Arc-shaped pipe section, 1-3—Lower pipe section, 2—Box body, 2-1—Gas outlet, 2-2—Drain pipe, 2-3—Support foot, 2-4—Pre-treatment chamber, 2-5—Post-treatment chamber, 2-6—Box bottom plate, 3—Second vertical pipe, 4—Baffle plate, 4-1—Airflow orifice, 5—First vertical pipe, 6—Jackaged liquid outlet pipe, 7—Pipe support seat, 7-1—Drain port, 8—Jackaged pipe, 8-1—Upper jacketed pipe, 8-2—Connecting pipe, 8-3—Lower jacketed pipe, 9—Front refrigerant inlet pipe, 10—Front refrigerant outlet pipe, 11—Spiral guide plate, 12—Heat exchange coil. Detailed Implementation

[0015] See Figures 1-3 As shown, this utility model discloses a cyclone gas-liquid separation device for VOCs waste gas recovery and treatment, comprising a housing 2 with a pretreatment chamber 2-4, a gas-liquid separation pipe 1 and a condensation heat exchange mechanism within the pretreatment chamber 2-4, wherein the housing 2 is provided with a partition 4 that separates the housing 2 into a front pretreatment chamber 2-4 and a rear posttreatment chamber 2-5. The housing 2 is constructed using a frame and a panel fixed to the frame, forming a sealed space. The bottom of the housing 2 is provided with support feet 2-3, and one side of the pretreatment chamber 2-4... The unit has an air inlet and an air outlet 2-1 on the other side of the post-treatment chamber 2-5. The exhaust gas entering the box 2 can be recycled and treated in the two treatment chambers in sequence. Finally, the exhaust gas with reduced organic matter concentration after treatment is discharged from the air outlet 2-1 into the external air pipe. Since the cyclone gas-liquid separation device and the condensation gas-liquid separation device of the post-treatment chamber 2-5 are integrated in the same box, the area occupied is small, which facilitates the optimization of the smoke flow path and cooling efficiency of the VOCs exhaust gas entering the box 2, realizes the airflow turbulence enhancement, and improves the gas-liquid dynamic separation effect.

[0016] See Figures 2-4As shown, the gas-liquid separation pipe 1 of this utility model is a U-shaped pipe, including an upper pipe section 1-1, a lower pipe section 1-3, and an arc-shaped pipe section 1-2 connecting the upper pipe section 1-1 and the lower pipe section 1-3. The U-shaped pipe is placed horizontally in the pretreatment chamber 2-4, improving the path of gas-liquid separation of waste gas in a limited space. The air inlet side of the upper pipe section 1-1 exits through the air inlet on the upper part of one side of the box body 2, and the outlet of the lower pipe section 1-3 is located on one side of the airflow orifice 4-1 on the lower part of the partition 4 inside the box body 2. The airflow orifice 4-1 on the partition 4 connects the pretreatment chamber 2-4 and the posttreatment chamber. Chambers 2-5 are interconnected. Within the limited space, the high-concentration VOCs waste gas to be treated is first introduced into gas-liquid separation pipe 1. Then, the waste gas treated by gas-liquid separation pipe 1 is introduced into pretreatment chamber 2-4 for further heat exchange and condensation, separating the liquid phase in stages. It then enters posttreatment chamber 2-5 for further condensation and gas-liquid separation, discharging or recovering the organic matter in liquid form. The treated low-concentration organic waste gas is discharged through outlet 2-1 into the gas pipe. The treated waste gas is then discharged into the RTO incinerator for combustion, reducing the workload of the RTO incinerator. See [link to product details]. Figure 2 , 3 As shown, the gas-liquid separation pipe 1 of this utility model is provided with a spiral guide plate 11 on the inner wall for rotating and guiding the waste gas entering the pipe and generating turbulence in the collision. The bottom of the spiral guide plate 11 is provided with a drain hole. VOCs waste gas with a certain pressure and temperature enters the gas-liquid separation pipe 1. Under the action of the spiral guide plate 11, the forced airflow forms a swirling and rolling flow towards the outlet, which greatly enhances the turbulence efficiency of the waste gas. The U-shaped pipe not only extends the path of the waste gas through the gas-liquid separation pipe 1, but also generates more liquid particles in the rotation and collision of the waste gas. Under the action of centrifugal force, the liquid particles gradually aggregate to form droplets, and under the action of their own weight, they flow to the bottom of the pipe and are discharged.

[0017] See Figures 2-4 As shown, the condensing heat exchange mechanism of this utility model includes a front refrigerant inlet pipe 9, a jacketed pipe 8, and a front refrigerant outlet pipe 10. The jacketed pipe 8 is installed on the gas-liquid separation pipe 1. The front refrigerant inlet pipe 9 is connected to the inlet of the jacketed pipe 8, and the outlet of the jacketed pipe 8 is connected to the front refrigerant outlet pipe 10. Therefore, when the refrigerant is introduced into the jacketed pipe 8, it cools and exchanges heat with the exhaust gas passing through the gas-liquid separation pipe 1, causing the liquid particles in the pipe to quickly aggregate, improving the gas-liquid separation effect, and effectively removing organic matter from the exhaust gas. See Figures 1-4 As shown, the interfaces of the front refrigerant inlet pipe 9 and the front refrigerant outlet pipe 10 of this invention are located outside the housing 2 for convenient on-site installation. The front refrigerant inlet pipe 9 and the front refrigerant outlet pipe 10 are located at the lower part of the housing 2 on the side of the air inlet. Neither the front refrigerant inlet pipe 9 nor the front refrigerant outlet pipe 10 has a temperature detection port. A temperature sensor is installed at the temperature detection port to detect the temperature of the incoming refrigerant and the temperature of the refrigerant after heat exchange. See... Figure 3 , 4As shown, the bottom of the inclined bottom plate 2-6 of the box body 2 of this utility model is provided with a drain pipe 2-2 at its lower part, which can realize non-powered fixed flow liquid collection, collecting liquid containing organic matter at the bottom plate 2-6 and then discharging or recovering it through the drain pipe 2-2. As shown in 3 and 4, the angle β between the bottom plate 2-6 and the horizontal plane of this utility model is 0.5~3°. If the angle β is 2°, the opening on the bottom plate 2-6 is connected to the drain pipe 2-2, and the drain pipe 2-2 is located on the air inlet side of the box body 2. The drain pipe 2-2 is provided with a flange interface, which is connected to the waste liquid pipe through the flange interface by fasteners, so as to recover or discharge the treated liquid.

[0018] See Figure 2 , 3 As shown, the upper pipe section 1-1 of the gas-liquid separator 1 of this utility model is a downwardly inclined pipe section. One end of the inclined pipe section extends out of the box body 2, and the other end is connected to the arc-shaped pipe section 1-2. Alternatively, the upper pipe section 1-1 of the gas-liquid separator 1 includes a straight pipe section extending out of the box body 2 and a downwardly inclined pipe section. The two ends of the inclined pipe section are connected to the straight pipe section and the arc-shaped pipe section 1-2, respectively. The waste gas that needs to be treated and has a certain pressure and temperature is introduced into the inclined pipe section. Under the action of the spiral guide plate 11, the liquid particles generated by the waste gas when passing through the gas-liquid separator 1 gradually gather into droplets under the action of centrifugal force of collision. Under its own weight, they gather at the bottom of the gas-liquid separator 1. Since the upper pipe section 1-1 has a certain downward inclination angle, the liquid can be quickly discharged to the lower pipe section and discharged out of the pipe with the waste gas. The angle α between the central axis of the inclined tube section 1-1 of this invention and the horizontal plane is 2~5°. If the angle α is 3°, turbulence is forced into the gas-liquid separator 1 when the VOCs waste gas enters it. This causes the waste gas to generate liquid particles during rotation and collision, which gradually aggregate into droplets and fall, discharging the liquid out of the gas-liquid separator into the pretreatment chamber. The upper tube section 1-1 of this invention has an upper connecting flange at its interface, which connects to the inlet pipe. The upper tube section 1-1 has a pressure detection port and a temperature detection port on the outside of the housing 2. Pressure gauges and temperature sensors can be installed on the corresponding pressure detection ports and temperature detection ports to monitor the pressure and temperature of the VOCs waste gas entering the gas-liquid separator 1 in real time, facilitating the control of the waste gas flow rate into the system. The spiral guide plates 11 inside the gas-liquid separation pipe 1 of this utility model are arranged at intervals or continuously. When arranged at intervals, the front part of the upper pipe 1-1 and the tail part of the lower pipe 1-3 have spiral guide plates 11, so that the waste gas generates liquid particles in the rotation and collision. Under the action of centrifugal force, the liquid particles are formed into droplets and discharged outside the pipe with the flow of waste gas.

[0019] See Figure 2 , 3As shown, the jacketed pipe 8 of this utility model includes an upper jacketed pipe 8-1, a lower jacketed pipe 8-3, and a connecting pipe 8-2. The upper jacketed pipe 8-1 is located in the inclined section of the upper pipe part 1-1, and the lower jacketed pipe 8-3 is located in the lower pipe part 1-3. A connecting pipe 8-2, communicating between the upper jacketed pipe 8-1 and the lower jacketed pipe 8-3, is located on the side of the arc-shaped pipe part 1-2 near the lower jacketed pipe 8-3. The jacket inlet on the lower jacketed pipe 8-3 is connected to the front refrigerant inlet pipe 9. The arc-shaped pipe part 1-2 does not have a jacketed pipe 8, which facilitates processing and allows the refrigerant to smoothly enter the jacketed pipe 8, while providing counter-current cooling for the waste gas in the gas-liquid separation pipe 1. See Figures 2-4 As shown, the jacket outlet on the upper jacketed tube 8-1 of this utility model is connected to the inlet at the top of the first vertical tube 5 via the jacketed liquid outlet pipe 6. The outlet at the bottom of the first vertical tube 5 is connected to the liquid inlet at the bottom of the vertically placed heat exchange coil 12 in the pretreatment chamber 2-4. The outlet at the top of the finned heat exchange coil 12 is connected to the inlet at the top of the second vertical tube 3. The outlet at the bottom of the second vertical tube 3 is connected to the front refrigerant outlet pipe 10. The first vertical tube 5 and the second vertical tube 3 also have fins, thereby increasing the heat exchange area. Figure 3 , 4 As shown, the heat exchange coil 12 of this utility model is composed of multiple interconnected U-shaped tubes and is installed at the top from the bottom of the pretreatment chamber 2-4. The refrigerant discharged from the upper jacket pipe 8-1 enters the bottom of the heat exchange coil 12 through the first vertical pipe 5, and is discharged from the top of the heat exchange coil 12 through the second vertical pipe 3 and the front refrigerant outlet pipe 10 for recycling. Similarly, the heat exchange coil 12 is vertically placed and installed in the housing 2. The refrigerant is introduced through the bottom of the heat exchange coil 12 and discharged from the top. The pretreatment chamber 2-4 has a large heat exchange area. See Figures 2-4 As shown, the interface between the front refrigerant inlet pipe 9 and the front refrigerant outlet pipe 10 of this utility model is provided with a connecting flange. After the connecting flange is connected to the flange on the refrigerant inlet pipe and the refrigerant outlet pipe, it is connected with fasteners. The refrigerant is introduced into the jacket pipe 8 and the heat exchange coil 12 to exchange heat and condense the waste gas in the gas-liquid separation pipe 1 and the waste gas in the pretreatment chamber 2-4, and the liquid phase in the waste gas is collected and separated into gas and liquid. The refrigerant of this utility model can be ethylene glycol or calcium chloride. The front refrigerant inlet pipe 9 introduces the refrigerant at -20° to -40°, and after heat exchange, the refrigerant at -1° to -5° is discharged from the front refrigerant outlet pipe 10.

[0020] See Figures 2-4As shown, the housing 2 of this utility model is provided with multiple pipe support seats 7. Multiple upper pipe support seats 7 are arranged at intervals, and one end of the upper pipe support seat 7 is connected to the upper part of the housing 2, and the other end is connected to the upper jacket pipe 8-1 and the upper part of the heat exchange coil 12. Multiple lower pipe support seats 7 are arranged at intervals, and one end of the lower pipe support seat 7 is connected to the lower plate of the housing 2, and the other end is connected to the lower jacket pipe 8-3 and the lower part of the heat exchange coil 12. The bottom of the lower pipe support seat 7 is provided with a drain port 7-1, which does not affect the discharge of liquid. The jacket pipe 8 is fixed by the pipe support seat 7, thereby fixing the gas-liquid separation pipe 1, and at the same time fixing and limiting the heat exchange coil 12.

Claims

1. A cyclone gas-liquid separator for VOCs waste gas recovery and treatment, characterized in that: The system includes a housing (2) with a pretreatment chamber (2-4) and a gas-liquid separation pipe (1) and a condensation heat exchange mechanism disposed within the pretreatment chamber (2-4). The gas-liquid separation pipe (1) is a U-shaped pipe, comprising an upper pipe section (1-1), a lower pipe section (1-3), and an arc-shaped pipe section (1-2) connecting the upper pipe section (1-1) and the lower pipe section (1-3). The air inlet side of the upper pipe section (1-1) extends out of the air inlet on the upper side of one side of the housing (2). The outlet of the lower pipe section (1-3) of the gas-liquid separation pipe (1) is located at the airflow orifice (4-1) at the lower part of the partition (4) inside the housing (2). The airflow orifice (4-1) on the partition (4) communicates with the pretreatment chamber (2-4) and the posttreatment chamber (2-5). A spiral guide plate (11) is provided on the inner wall of the gas-liquid separation pipe (1) to rotate and guide the waste gas entering the pipe and generate turbulence in the collision. The bottom of the spiral guide plate (11) is provided with a drain hole. The condensation heat exchange mechanism includes a front refrigerant inlet pipe (9), a jacket pipe (8) and a front refrigerant outlet pipe (10). The jacket pipe (8) is sealed on the outer periphery of the gas-liquid separation pipe (1). The front refrigerant inlet pipe (9) is connected to the inlet of the jacket pipe (8). The outlet on the jacket pipe (8) is connected to the front refrigerant outlet pipe (10). The interface of the front refrigerant inlet pipe (9) and the interface of the front refrigerant outlet pipe (10) are located outside the box body (2). The bottom part of the inclined box bottom plate (2-6) of the box body (2) is provided with a drain pipe (2-2).

2. The cyclone gas-liquid separator for VOCs waste gas recovery and treatment according to claim 1, characterized in that: The upper pipe section (1-1) of the gas-liquid separator (1) is a downwardly inclined pipe section, or the upper pipe section (1-1) of the gas-liquid separator (1) includes a straight pipe section extending out of the box body (2) and a downwardly inclined pipe section. The interface outside the upper pipe section (1-1) is provided with a connecting flange. The upper pipe section (1-1) is provided with a pressure detection port and a temperature detection port outside the box body (2). The spiral guide plates (11) inside the gas-liquid separator (1) are arranged at intervals or continuously. When arranged at intervals, the tail of the lower pipe section (1-3) at the front of the upper pipe section (1-1) has a spiral guide plate (11).

3. The cyclone gas-liquid separator for VOCs waste gas recovery and treatment according to claim 2, characterized in that: The angle α between the central axis of the inclined tube section of the upper tube (1-1) and the horizontal plane is 2~5°.

4. The cyclone gas-liquid separator for VOCs waste gas recovery and treatment according to claim 1, characterized in that: The jacketed tube (8) includes an upper jacketed tube (8-1), a lower jacketed tube (8-3), and a connecting tube (8-2). The upper jacketed tube (8-1) is located in the inclined section of the upper tube (1-1), and the lower jacketed tube (8-3) is located in the lower tube (1-3). A connecting tube (8-2) is provided on the side of the upper jacketed tube (8-1) and the lower jacketed tube (8-3) near the arc-shaped tube section (1-2) to connect the upper jacketed tube (8-1) and the lower jacketed tube (8-3). The jacketed tube on the lower jacketed tube (8-3) has a... The inlet is connected to the front refrigerant inlet pipe (9). The jacket outlet on the upper jacket pipe (8-1) is connected to the inlet at the top of the first vertical pipe (5) through the jacket liquid outlet pipe (6). The outlet at the bottom of the first vertical pipe (5) is connected to the liquid inlet at the bottom of the vertically placed heat exchange coil (12) in the pretreatment chamber (2-4). The outlet at the top of the finned heat exchange coil (12) is connected to the inlet at the top of the second vertical pipe (3). The outlet at the bottom of the second vertical pipe (3) is connected to the front refrigerant outlet pipe (10).

5. A cyclone gas-liquid separator for VOCs waste gas recovery and treatment according to claim 1, characterized in that: The front refrigerant inlet pipe (9) and the front refrigerant outlet pipe (10) are located at the lower part of the air inlet side of the housing (2), and the interfaces of the front refrigerant inlet pipe (9) and the front refrigerant outlet pipe (10) are provided with connecting flanges. There are no temperature detection ports on the front refrigerant inlet pipe (9) and the front refrigerant outlet pipe (10).

6. A cyclone gas-liquid separator for VOCs waste gas recovery and treatment according to claim 1, characterized in that: The box body (2) is provided with multiple pipe support seats (7). Multiple upper pipe support seats (7) are spaced apart. One end of the upper pipe support seat (7) is connected to the upper part of the box body (2), and the other end is connected to the upper part of the upper jacket pipe (8-1) and the heat exchange coil (12). Multiple lower pipe support seats (7) are spaced apart. One end of the lower pipe support seat (7) is connected to the lower part of the box body (2), and the other end is connected to the lower part of the lower jacket pipe (8-3) and the heat exchange coil (12). The bottom of the lower pipe support seat (7) is provided with a drain port (7-1).

7. A cyclone gas-liquid separator for VOCs waste gas recovery and treatment according to claim 1, characterized in that: The included angle β between the bottom plate (2-6) of the box and the horizontal plane is 0.5~3°, and the hole on the bottom plate (2-6) is connected to the drain pipe (2-2). The drain pipe (2-2) is located on the side of the air inlet of the box body (2), and the drain pipe (2-2) is provided with a flange interface.

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