Tank area VOCs waste gas treatment process and device

Abstract

The invention relates to the field of VOCs waste gas treatment, and particularly discloses a tank field VOCs waste gas treatment process and device, which adopts a condensation-water washing-adsorption-desorption integrated process to realize deep purification, that is, each process is complementary, VOCs with different physicochemical properties are covered, the overall removal rate is effectively improved, and the treatment effect is good. Meanwhile, through linkage matching of a transverse pipe, a moving rod, a rotating rod II, an air bag and other parts, on one hand, mixed gas is fully contacted with filler in the water washing tower to improve the adsorption efficiency of the gas, and on the other hand, high-temperature steam is pressurized through the transverse pipe to improve the penetrability of the steam and improve the desorption efficiency of an adsorption bed layer; and the high-temperature steam in the air bag is directly conveyed into the adsorption bed layer through the air outlet pipe, so that internal-external combined action is formed, the desorption efficiency of the adsorption bed layer is effectively improved, and the waste gas treatment efficiency is further improved.

Description

Technical Field

[0001] The present invention relates to the field of VOCs waste gas treatment, and particularly to a treatment process and device for VOCs waste gas in a tank farm. Background Art

[0002] With the increasingly strict standards for air pollution control, the problem of VOCs waste gas emissions has received attention. As one of the industries with the largest waste gas emissions, the coking industry is a key area for waste gas treatment. Currently, there are various technologies for treating coking VOCs waste gas. In the tank farm of the chemical production area, tar storage tanks, ammonia water circulation tanks for gas purification, top charging bins, dry quenching tanks, and start-up and shutdown operations will all emit a large amount of VOCs waste gas mainly composed of hydrogen sulfide, ammonia, hydrogen cyanide, tar, naphthalene, benzene series, polycyclic and heterocyclic aromatic hydrocarbons, etc.

[0003] Long-term inhalation of such gases will cause serious harm to the health of workers, surrounding residents, and the atmospheric environment. Therefore, waste gas treatment devices are often required to collect and treat such gases.

[0004] In view of the above problems, a waste gas treatment method and a method for treating waste gas containing organic substances (publication number: CN108816018A) are provided. It adopts a wet treatment process to completely eliminate the risks of explosion and combustion. For the waste gas treatment spray system with excessive VOCs, it can be transformed by adding a dosing system, which is convenient for upgrading the standards.

[0005] However, in actual use, the spray tower and packing tower in the above technical solutions still have disadvantages such as short gas-liquid contact time, uneven mixing, and low absorption efficiency. This may cause unabsorbed pollutants to escape with the waste gas, or the absorption liquid may cause increased difficulty in treating waste liquid due to overload, generating high-concentration wastewater and increasing the pressure of subsequent treatment. Summary of the Invention

[0006] The purpose of the present invention is to provide a treatment process and device for VOCs waste gas in a tank farm to solve the technical defects proposed in the background art.

[0007] The purpose of the present invention can be achieved by the following technical solutions: A treatment process for VOCs waste gas in a tank farm is based on a treatment device for VOCs waste gas in a tank farm, and the treatment process for VOCs waste gas in a tank farm includes the following process steps:

[0008] Pretreatment: Pass the mixed gas through three condensation tanks in sequence, with condensation temperatures of -5°C, -25°C, and -70°C respectively. During the process, the recovered condensate flows into a temporary storage tank for recovery.

[0009] Initial adsorption: The mixed gas after condensation enters the water scrubber, and the waste gas in the mixed gas is absorbed by the water scrubber. The waste gas treated by the water scrubber enters the spray tower, where the water-soluble organic substances in the mixed gas dissolve, and the sewage is discharged through the sewage pump.

[0010] Re-adsorption: The mixed gas treated by the spray tower enters the adsorption tank, and the volatile organic compounds in the mixed gas are adsorbed by the adsorption bed layer. The remaining gas is discharged. After adsorption is completed, the adsorption bed layer is cleaned by the treatment device, and the sewage flows into the temporary storage tank for recovery.

[0011] The present invention also provides a tank area VOCs waste gas treatment device, which is used in the above-mentioned tank area VOCs waste gas treatment process, and includes a horizontal pipe, a moving rod, a rotating rod one, and a rotating rod two. The horizontal pipe is located on one side of the adsorption tank, and the moving rod is movably installed in the horizontal pipe;

[0012] One end of the horizontal pipe is fixedly connected to the adsorption tank through a pipeline. An air inlet pipe is fixedly installed on one side of the horizontal pipe. The rotating rod one is movably installed on one side of the water scrubber, and the rotating rod two is movably installed in the water scrubber. The rotating rod two and the rotating rod one are in transmission connection, and a rotating fan blade is fixedly installed on the rotating rod two;

[0013] It also includes a rotating rod three, a lead screw, a moving plate, and an air bag. The rotating rod three is movably installed in the adsorption tank, and a wind cup is fixedly installed on the rotating rod three. The lead screw is movably installed on one side of the adsorption tank. The rotating rod three and the lead screw are in transmission connection, and the moving plate is movably installed on the lead screw;

[0014] The top of the moving plate is fixedly connected to the air bag. The bottom of the air bag is fixedly connected to the temporary storage tank through an air delivery pipe, and the top of the air bag is fixedly connected to the temporary storage tank through an air outlet pipe.

[0015] Preferably, a piston is movably installed in the horizontal pipe. The piston is fixedly connected to the moving rod. A turntable is fixedly installed at the bottom of the rotating rod one. An adjusting rod is movably installed on the turntable, and the adjusting rod is movably connected to the moving rod. A synchronous wheel is fixedly installed on the rotating rod one.

[0016] Preferably, a synchronous wheel is fixedly installed at the bottom of the rotating rod two, and the synchronous wheels are in transmission connection through a synchronous belt. A rotating block is fixedly installed at the top of the rotating rod two, and the rotating fan blade is fixedly installed on the rotating block.

[0017] Preferably, a bevel gear one is fixedly installed at one end of the rotating rod three, and a bevel gear two is fixedly installed at the bottom of the lead screw. The bevel gear one and the bevel gear two are meshed and connected. A moving nut is movably installed on the lead screw through a thread, and one side of the moving nut is fixedly connected to the moving plate.

[0018] Preferably, there are two adsorption tanks, and both adsorption tanks are fixedly connected to the top of the spray tower through pipelines. A steam pipe is fixedly installed on the top of the adsorption tank, and the steam pipe is fixedly connected to the cooling tank.

[0019] Preferably, a plurality of wind cups are provided, and the plurality of wind cups are evenly spaced apart on the rotating rod three, the air supply pipe is located above the wind cups, and the air outlet pipe is located at one side of the adsorption bed layer.

[0020] The beneficial effects of the present invention are as follows:

[0021] (1) The present invention adopts an integrated process of condensation-water washing-adsorption-desorption, that is, firstly, the mixed gas is cooled by a condenser, and the organic matter is directly recovered by low-temperature liquefaction for high-concentration and high-boiling-point VOCs (such as benzene series and esters), thereby reducing the subsequent processing load. At the same time, the water-soluble components and particulate matter are removed by water washing treatment in a spray tower, and the waste gas is cooled and purified at the same time, reducing the risk of blockage in the adsorption section. Then, deep purification is achieved by adsorption treatment in an adsorption tank, that is, each process complements each other, covers VOCs with different physical and chemical properties, and effectively improves the overall removal rate;

[0022] (2) The present invention also uses the linkage of the horizontal tube, the moving rod, the second rotating rod and the airbag. When the mixed gas enters the water scrubber, the first rotating rod is driven to rotate. At this time, the second rotating rod rotates synchronously, and then the rotating fan blades are used to disperse the mixed gas, so that the mixed gas is fully in contact with the filler in the water scrubber, thereby improving the gas adsorption efficiency;

[0023] At the same time, when the rotating rod rotates, the moving rod moves in the horizontal pipe, thereby transporting high-temperature steam to the unoperated adsorption tank through the air inlet pipe and pipeline, desorbing the adsorption bed through the high temperature, and collecting the sewage. The high-temperature steam is pressurized through the horizontal pipe to improve the steam penetration and the desorption efficiency of the adsorption bed.

[0024] At the same time, when high-speed steam enters the adsorption tank, it first contacts the wind cup, and then drives the rotating rod three to rotate through the wind cup, thereby using the rotating rod three to drive the screw to rotate. At this time, the moving plate makes reciprocating motion on the screw, driving the airbag to expand and contract periodically. When the airbag expands, the high-temperature steam is drawn into the airbag through the air pipe. When the airbag contracts, the high-temperature steam in the airbag is directly transported to the adsorption bed through the air outlet pipe, thereby forming an internal and external joint effect, effectively improving the desorption efficiency of the adsorption bed, and thus improving the exhaust gas treatment efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below in conjunction with the accompanying drawings;

[0026] Figure 1 It is a schematic diagram of the treatment process flow of the present invention;

[0027] Figure 2 It is a schematic diagram of the structure of the present invention;

[0028] Figure 3It is a schematic structural diagram of the processing device in the present invention;

[0029] Figure 4 It is a schematic structural diagram of the horizontal pipe in the present invention;

[0030] Figure 5 It is a schematic structural diagram of the turntable in the present invention;

[0031] Figure 6 It is a schematic structural diagram of the moving rod in the present invention;

[0032] Figure 7 It is a schematic structural diagram of the airbag in the present invention.

[0033] Legend: 1. Condensation tank; 11. Temporary storage tank; 12. Water washing tower; 13. Spray tower; 14. Adsorption tank; 2. Processing device; 21. Horizontal pipe; 22. Moving rod; 23. Rotating rod one; 24. Rotating rod two; 25. Inlet pipe; 26. Rotating fan blade; 27. Rotating rod three; 28. Lead screw; 29. Moving plate; 30. Airbag; 31. Wind cup; 32. Air delivery pipe; 33. Outlet pipe; 34. Piston; 35. Turntable; 36. Adjusting rod; 37. Bevel gear one; 38. Bevel gear two; 39. Moving nut; 40. Steam pipe. Specific embodiments

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0035] Example 1: Please refer to Figure 1 As shown, this embodiment is a VOCs waste gas treatment process for a tank farm, including the following process steps:

[0036] Pretreatment: The mixed gas is sequentially passed through three condensation tanks 1, and the condensation temperatures are -5°C, -25°C, and -70°C respectively. During the process, the condensed recovered material flows into the temporary storage tank 11 for recovery;

[0037] Initial adsorption: The condensed mixed gas enters the water washing tower 12, and the waste gas in the mixed gas is absorbed through the water washing tower 12. The waste gas treated by the water washing tower 12 enters the spray tower 13, and the water-soluble organic matter in the mixed gas dissolves, and the sewage is discharged through the sewage pump.

[0038] Re-adsorption: The mixed gas treated by the spray tower 13 enters the adsorption tank 14, and the volatile organic compounds in the mixed gas are adsorbed through the adsorption bed layer. The remaining gas is discharged. After adsorption is completed, the adsorption bed layer is cleaned by the treatment device 2, and the sewage flows into the temporary storage tank 11 for recovery.

[0039] There are two adsorption tanks 14, and both adsorption tanks 14 are fixedly connected to the top of the spray tower 13 through pipelines. By alternately operating the two adsorption tanks 14, continuous treatment of waste gas is achieved, improving the waste gas treatment efficiency. A steam pipe 40 is fixedly installed at the top of the adsorption tank 14, and the steam pipe 40 is fixedly connected to the cooling tank. When the mixed gas passes through the adsorption bed layer in the adsorption tank 14, the volatile organic compound components are selectively adsorbed into the pores of the adsorbent under normal pressure and normal temperature conditions, while inorganic substances such as air and moisture are not adsorbed and directly pass through the adsorption bed layer and are discharged into the atmosphere.

[0040] The regeneration of the adsorbent adopts the principle of temperature swing desorption, specifically: using the characteristic that the equilibrium adsorption capacity of the adsorbent decreases with the increase of temperature, the adsorbed organic matter is brought to a state where it is easy to fall off through steam, and the adsorbed organic matter is desorbed. The desorbed organic matter vapor is condensed by the cooling tank, and then the sewage enters the temporary storage tank 11. When the temporary storage tank 11 reaches the set liquid level, the sewage transfer pump is started to send the sewage to the sewage treatment plant. At the same time, after desorption is completed, fresh air is introduced to purge and cool the bed layer, remove the residual moisture and reduce the temperature of the adsorption bed layer to the normal temperature state.

[0041] That is, an integrated process of condensation - water washing - adsorption - desorption is adopted. First, the mixed gas is cooled by the condensation tank 1. For high-concentration and high-boiling VOCs (such as benzene series and esters), the organic matter is directly recovered by low-temperature liquefaction, reducing the subsequent treatment load. At the same time, through the water washing treatment of the spray tower 13, the water-soluble components and particulate matter are removed, and the waste gas is cooled and purified at the same time, reducing the risk of blockage in the adsorption section. Then, through the adsorption treatment of the adsorption tank 14, deep purification is achieved, that is, each process complements each other, covering VOCs with different physical and chemical properties, and effectively improving the overall removal rate.

[0042] Embodiment 2: Please refer to Figure 2 - Figure 7 As shown, the present invention further includes a VOCs waste gas treatment device for a tank area, which is used in the above-mentioned VOCs waste gas treatment process for a tank area, including a horizontal pipe 21, a moving rod 22, a rotating rod one 23 and a rotating rod two 24. The horizontal pipe 21 is located on one side of the adsorption tank 14, and the moving rod 22 is movably installed in the horizontal pipe 21. One end of the horizontal pipe 21 is fixedly connected to the adsorption tank 14 through a pipeline. There are two adsorption tanks 14, and solenoid valves are arranged on the pipeline. When the adsorption tank 14 is not working, the solenoid valve corresponding to the adsorption tank 14 is in the open state, and the other solenoid valve is closed. By alternately controlling in this way, continuous desorption of the adsorption tank 14 is achieved.

[0043] An air inlet pipe 25 is fixedly installed on one side of the horizontal pipe 21. The air inlet pipe 25 is fixedly connected to the steam pipe 40. By extracting high-temperature steam into the interior of the horizontal pipe 21, the first rotating rod 23 is movably installed on one side of the water washing tower 12, the second rotating rod 24 is movably installed in the water washing tower 12, the second rotating rod 24 and the first rotating rod 23 are in transmission connection, a rotating fan blade 26 is fixedly installed on the second rotating rod 24, a rotating block is fixedly installed at the top of the second rotating rod 24, and the rotating fan blade 26 is fixedly installed on the rotating block;

[0044] That is, when the second rotating rod 24 rotates, it drives the rotating block to rotate synchronously, and then drives the rotating fan blade 26 to rotate. On the one hand, the rotating fan blade 26 disperses the aggregated mixed gas, reducing the adsorption burden of the water washing tower 12. On the other hand, it increases the contact area between the mixed gas and the packing section in the water washing tower 12, improving the adsorption efficiency of the packing.

[0045] It further includes a third rotating rod 27, a lead screw 28, a moving plate 29 and an air bag 30. The third rotating rod 27 is movably installed in the adsorption tank 14. A wind cup 31 is fixedly installed on the third rotating rod 27. There are multiple wind cups 31, and the multiple wind cups 31 are evenly spaced on the third rotating rod 27. When the horizontal pipe 21 transports high-temperature steam to the adsorption tank 14, the high-temperature steam impacts the wind cups 31, and then uses the wind cups 31 to drive the third rotating rod 27 to rotate.

[0046] The lead screw 28 is movably installed on one side of the adsorption tank 14. The third rotating rod 27 and the lead screw 28 are in transmission connection. The moving plate 29 is movably installed on the lead screw 28. A piston 34 is movably installed in the horizontal pipe 21. The piston 34 is fixedly connected to the moving rod 22. A turntable 35 is fixedly installed at the bottom of the first rotating rod 23. An adjusting rod 36 is movably installed on the turntable 35. The adjusting rod 36 is movably connected to the moving rod 22. A synchronous pulley is fixedly installed on the first rotating rod 23, and a synchronous pulley is fixedly installed at the bottom of the second rotating rod 24. The synchronous pulleys are in transmission connection through a synchronous belt. By using the synchronous pulleys and the synchronous belt, it is ensured that the first rotating rod 23 and the second rotating rod 24 rotate synchronously.

[0047] The top of the moving plate 29 is fixedly connected to the air bag 30. The bottom of the air bag 30 is fixedly connected to the storage tank 11 through an air delivery pipe 32, and the top of the air bag 30 is fixedly connected to the storage tank 11 through an air outlet pipe 33. The air delivery pipe 32 is located above the wind cups 31, and the air outlet pipe 33 is located on one side of the adsorption bed layer. The working principle of the air bag 30 is specifically as follows: One-way ventilation valves are fixedly installed in both the air delivery pipe 32 and the air outlet pipe 33;

[0048] That is, the gas can only enter the airbag 30 from the gas pipeline 32 and can only be output from the gas outlet pipe 33. When the adsorption tank 14 is performing adsorption treatment, due to the low flow rate of the incoming gas, there is a certain rotational resistance for the third rotating rod 27. At this time, the third rotating rod 27 remains stable. When the adsorption tank 14 starts desorption, under the action of the horizontal pipe 21, the high-temperature steam has a high flow rate. Under the action of the steam, the third rotating rod 27 starts to rotate.

[0049] One end of the third rotating rod 27 is fixedly installed with a first bevel gear 37, and the bottom of the lead screw 28 is fixedly installed with a second bevel gear 38. The first bevel gear 37 and the second bevel gear 38 are meshed and connected. A moving nut 39 is movably installed on the lead screw 28 through a thread. One side of the moving nut 39 is fixedly connected to the moving plate 29. When the third rotating rod 27 rotates, the first bevel gear 37 and the second bevel gear 38 are used to drive the lead screw 28 to rotate, and then drive the moving nut 39 to reciprocate on the lead screw 28, so as to regulate the airbag 30.

[0050] That is, when the mixed gas enters the water washing tower 12, it drives the first rotating rod 23 to rotate. At this time, the second rotating rod 24 rotates synchronously, and then the rotating fan blades 26 are used to disperse the mixed gas, so that the mixed gas is in full contact with the packing in the water washing tower 12, improving the adsorption efficiency of the gas;

[0051] At the same time, during the rotation of the first rotating rod 23, the moving rod 22 moves in the horizontal pipe 21, so as to transport the high-temperature steam to the unoperated adsorption tank 14 through the air inlet pipe 25 and the pipeline. Through high temperature, the adsorption bed layer is desorbed, and the sewage is collected. The high-temperature steam is pressurized through the horizontal pipe 21 to improve the penetrability of the steam and the desorption efficiency of the adsorption bed layer;

[0052] At the same time, when the high-speed steam enters the adsorption tank 14, it first contacts the wind cup 31, and then drives the third rotating rod 27 to rotate through the wind cup 31, so as to drive the lead screw 28 to rotate by using the third rotating rod 27. At this time, the moving plate 29 reciprocates on the lead screw 28, driving the airbag 30 to expand and contract periodically. When the airbag 30 expands, the high-temperature steam is extracted into the airbag 30 through the gas pipeline 32. When the airbag 30 contracts, the high-temperature steam in the airbag 30 is directly transported to the adsorption bed layer through the gas outlet pipe 33, so as to form an internal-external combined action, effectively improving the desorption efficiency of the adsorption bed layer and further improving the waste gas treatment efficiency.

[0053] Combined with Embodiment 1 and Embodiment 2, it can be seen that an integrated process of condensation - water washing - adsorption - desorption is adopted to achieve deep purification, that is, each process complements each other, covering VOCs with different physical and chemical properties, effectively improving the overall removal rate. At the same time, through the linkage cooperation of components such as the horizontal pipe 21, the moving rod 22, the second rotating rod 24, and the airbag 30, on the one hand, the mixed gas is fully contacted with the packing in the water washing tower 12 to improve the gas adsorption efficiency. On the other hand, the high-temperature steam is pressurized by the horizontal pipe 21 to improve the steam penetration and the desorption efficiency of the adsorption bed layer. At the same time, the high-temperature steam in the airbag 30 is directly transported to the adsorption bed layer through the air outlet pipe 33, so as to form an internal - external combined effect, effectively improving the desorption efficiency of the adsorption bed layer, and further improving the waste gas treatment efficiency.

[0054] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor limit the present invention to the specific embodiments shown. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification to better explain the principle and practical application of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A tank area VOCs waste gas treatment process, characterized in that: The tank area VOCs waste gas treatment process is based on the tank area VOCs waste gas treatment device, and the tank area VOCs waste gas treatment process includes the following process steps: Pretreatment: the mixed gas is passed through three condensation tanks (1) in sequence, with condensation temperatures of -5°C, -25°C, and -70°C respectively, and the recovered gas condensed in the process is flowed into a temporary storage tank (11) for recovery; Initial adsorption: the condensed mixed gas enters the water scrubber (12), and the waste gas in the mixed gas is absorbed by the water scrubber (12). The waste gas treated by the water scrubber (12) enters the spray tower (13), the water-soluble organic matter in the mixed gas is dissolved, and the waste water is discharged through the sewage pump; Secondary adsorption: the mixed gas treated by the spray tower (13) enters the adsorption tank (14), and the volatile organic matter in the mixed gas is adsorbed by the adsorption bed, and the remaining gas is discharged. After the adsorption is completed, the adsorption bed is cleaned by the treatment device (2), and the wastewater flows into the temporary storage tank (11) for recovery.

2. A tank area VOCs waste gas treatment device, using a tank area VOCs waste gas treatment process as claimed in claim 1, characterized in that: It comprises a transverse tube (21), a moving rod (22), a first rotating rod (23) and a second rotating rod (24), wherein the transverse tube (21) is located at one side of the adsorption tank (14), and the moving rod (22) is movably installed in the transverse tube (21); One end of the transverse tube (21) is fixedly connected to the adsorption tank (14) through a pipeline, an air inlet pipe (25) is fixedly installed on one side of the transverse tube (21), the first rotating rod (23) is movably installed on one side of the water washing tower (12), the second rotating rod (24) is movably installed in the water washing tower (12), the second rotating rod (24) is transmission-connected to the first rotating rod (23), and a rotating fan blade (26) is fixedly installed on the second rotating rod (24); It also comprises a rotating rod (27), a screw rod (28), a movable plate (29) and an air bag (30), wherein the rotating rod (27) is movably mounted in the adsorption tank (14), a wind cup (31) is fixedly mounted on the rotating rod (27), the screw rod (28) is movably mounted on one side of the adsorption tank (14), the rotating rod (27) and the screw rod (28) are transmission-connected, and the movable plate (29) is movably mounted on the screw rod (28); The top of the movable plate (29) is fixedly connected to the air bag (30), the bottom of the air bag (30) is fixedly connected to the temporary storage tank (11) via an air delivery pipe (32), and the top of the air bag (30) is fixedly connected to the temporary storage tank (11) via an air outlet pipe (33).

3. A tank area VOCs waste gas treatment device according to claim 2, characterized in that: A piston (34) is movably mounted in the transverse tube (21), and the piston (34) is fixedly connected to the moving rod (22). A turntable (35) is fixedly mounted on the bottom of the rotating rod (23), and an adjusting rod (36) is movably mounted on the turntable (35), and the adjusting rod (36) is movably connected to the moving rod (22). A synchronous wheel is fixedly mounted on the rotating rod (23), and a motor is fixedly mounted on the outer wall of the water washing tower (12), and an output end of the motor is fixedly connected to the rotating rod (23).

4. A tank area VOCs waste gas treatment device according to claim 3, characterized in that: A synchronous wheel is fixedly mounted on the bottom of the second rotating rod (24), and the synchronous wheels are connected through a synchronous belt transmission. A rotating block is fixedly mounted on the top of the second rotating rod (24), and the rotating blade (26) is fixedly mounted on the rotating block.

5. A tank area VOCs waste gas treatment device according to claim 4, characterized in that: A bevel gear one (37) is fixedly mounted on one end of the rotating rod three (27), a bevel gear two (38) is fixedly mounted on the bottom of the screw rod (28), the bevel gear one (37) and the bevel gear two (38) are meshingly connected, a movable nut (39) is movably mounted on the screw rod (28) through a thread, and one side of the movable nut (39) is fixedly connected to the movable plate (29).

6. A tank area VOCs waste gas treatment device according to claim 2, characterized in that: Two adsorption tanks (14) are provided, and both of the two adsorption tanks (14) are fixedly connected to the top of the spray tower (13) through pipelines. A steam pipe (40) is fixedly installed on the top of the adsorption tank (14), and the steam pipe (40) is fixedly connected to the cooling tank.

7. A tank area VOCs waste gas treatment device according to claim 6, characterized in that: A plurality of wind cups (31) are provided, and the plurality of wind cups (31) are evenly spaced and distributed on the rotating rod three (27); the air delivery pipe (32) is located above the wind cups (31); and the air outlet pipe (33) is located on one side of the adsorption bed layer.

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