An absorption-desorption process for organic waste gases

Abstract

This invention discloses an absorption and desorption process for organic waste gas, aiming to provide an absorption and desorption process for organic waste gas with good filtration and separation effects. The organic waste gas consists of paint particles and VOCs. The absorption and desorption steps are as follows: S1. The waste gas enters the absorption device, absorbs VOCs, and solvent extracts the paint particles, causing the particles to separate from the solvent; S2. The particles are collected by filtration; S3. Solvent flash evaporation desorption. The beneficial effects of this invention are: multiple filtrations ensure the absorption and purification effect of the waste gas; multiple filtrations simultaneously improve the filtration effect of particulate matter in the gas; and the separation and desorption effects are improved.

Description

Technical Field

[0001] This invention relates to the technical field of organic waste gas treatment, and in particular to an absorption and desorption process for organic waste gas. Background Technology

[0002] As is well known, spray painting workshops generate a large amount of exhaust gas during spray painting operations, mainly consisting of paint particles and VOCs. The typical oil-based paint spraying process mainly comprises surface pretreatment, spraying, leveling, and drying. This process produces a significant amount of exhaust gas, which, under environmental regulations, must be treated before being released. The current mainstream treatment process is dry filtration + adsorption + desorption. However, this process suffers from high investment, high operating costs, and cumbersome maintenance. A special oil absorption process is now being used. By adding a special oil to the tank, the oil utilizes the property of similar solvents dissolving in similar substances to absorb paint particles and VOCs from the exhaust gas. Simultaneously, based on the dispersion characteristics of paint particles, the absorption oil performs solvent extraction on the paint particles, allowing the particles to be removed from the solvent and ensuring the resulting gas meets emission standards. However, as exhaust gas is introduced, the filtration efficiency of the special oil in the tank decreases, necessitating further filtration and collection of the particles within the special oil. Current methods suffer from poor particle filtration efficiency. The solvent is dispersed into the absorbent oil. Flash evaporation is required to separate the solvent and absorbent oil. However, existing flash evaporation devices have the disadvantage of poor separation effect. Summary of the Invention

[0003] The present invention aims to overcome the shortcomings of poor filtration and separation in the prior art, and provides an absorption and desorption process for organic waste gas with good filtration and separation effects.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: an absorption and desorption process for organic waste gas, wherein the organic waste gas consists of paint particles and VOCs, and the absorption and desorption steps are as follows:

[0005] S1. The exhaust gas enters the absorption device, which absorbs VOCs and extracts paint particles using solvent, causing the particles to be removed from the solvent.

[0006] S2. Filter and collect particulate matter;

[0007] S3. Solvent flash desorption.

[0008] The waste gas first enters the absorption unit to absorb VOCs. Simultaneously, particulate matter in the waste gas is extracted by the absorbent oil, separating the particulate matter from the solvent. The particulate matter mixes in the absorbent oil, which is then filtered to absorb and collect the remaining particulate matter, ensuring its purity. The absorbent oil then enters the desorption unit, where the solvent is flash-evaporated and recovered. The absorbent oil is then returned to the absorption unit, completing the treatment of the organic waste gas. This process provides excellent filtration and separation effects, and compared to dry absorption filtration, it offers better performance, lower cost, and higher efficiency.

[0009] Preferably, the absorption and desorption of organic waste gas employs an absorption and desorption device, which includes an absorption unit and a desorption unit. The absorption unit is equipped with several oil tanks connected in series. An outlet pipe is installed at the top of one end of the oil tank, and an inlet pipe is connected to the side wall of the other end of the oil tank. A rotatable rotating rod is connected to the top of the oil tank and is placed inside the oil tank. Several adjustable-angle filter components are connected to the lower end of the rotating rod, and a movable pressing plate is connected to the upper end of the rotating rod. The pressing plate corresponds to the filter components. The desorption unit is equipped with a flash tank, and a buffer chamber is provided on the outside of the flash tank. An inlet pipe is connected to the top of the flash tank, penetrating the buffer chamber. A vacuum pump is installed on the inlet pipe, which communicates with the oil tank. A rotatable heating element assembly is installed inside the flash tank, and a connecting hole is provided at the top of the flash tank, communicating with the buffer chamber. A condensing plate is installed at the top of the buffer chamber. Several oil tanks are connected in series to form a multi-stage absorption tower. One tank has an outlet pipe at its top, while the other tank has an inlet pipe connected to its side wall. Special oil for absorption and filtration is added to the tanks. A rotating rod is installed inside the tank, with several filter components connected to it. The rotating rod can rotate within the tank, and the angle of the filter components is adjustable. This adjustment, combined with the rotation of the rod, regulates the stirring speed and effect of the special oil within the tank. This ensures that the stirred oil collides with the filter components, filtering and collecting particulate matter from the oil, ensuring good and high filtration efficiency. A pressing plate is installed at the upper end of the rotating rod, and it can move up and down along the rod. After rotating for a certain period, the rod stops, the filter components are adjusted to a horizontal position, and the pressing plate moves down along the rotating rod to press the collected particulate matter, squeezing out the special oil from the particles, ensuring good and high filtration efficiency. Meanwhile, this filtration and absorption device performs multiple absorption cycles to ensure absorption and improve filtration efficiency. The flash tank is a tank structure with a rotatable heating element assembly inside. This assembly flashes the mixture entering the tank, separating the solvent from the absorbent oil by vaporizing it. A buffer chamber is located on the outer layer of the flash tank, and a connecting hole at the top connects the flash tank to the buffer chamber. A condenser plate at the top of the buffer chamber condenses the gaseous solvent, and the buffer chamber collects the condensed solvent. The rotatable heating element assembly heats the mixture entering the flash tank; its rotation during heating increases the rate at which the vaporized solvent diffuses into the buffer chamber, resulting in better separation.

[0010] Preferably, the opposite sidewall of the rotating rod is provided with several through guide grooves. The filter assembly includes a fixed filter unit and a movable filter unit. The fixed filter unit is provided with a fixed block connected to the middle of the guide groove. The movable filter unit is provided with a movable block embedded in the guide groove. The movable block is located below the fixed block and is arranged perpendicular to the fixed block. A telescopic cylinder is connected between the bottom surface of the movable block and the bottom surface of the guide groove. The two ends of the fixed block and the movable block are respectively connected to filter plates through a rotating motor. The filter plates are provided with filter grooves, and the bottom of the filter grooves is provided with several filter holes. A guide groove is provided on the rotating rod, penetrating the opposing sidewalls. The filter assembly consists of a fixed filter unit and a movable filter unit. A fixed block is installed in the middle of the guide groove in the fixed filter unit. A movable block is installed below the fixed block in the movable filter unit. The movable block slides up and down within the guide groove via a telescopic cylinder connected to it, maintaining a perpendicular position to the fixed block. Filter plates are connected to both ends of the fixed and movable blocks via rotating motors. These motors adjust the rotation angle of the filter plates, ensuring they can filter and collect particulate matter at any angle within the special oil in the tank, guaranteeing filtration effectiveness. The telescopic cylinder moves the movable block up and down to filter and collect particulate matter from different layers within the special oil in the tank, ensuring filtration effect and efficiency. Filter grooves are provided on the filter plates to collect the filtered particulate matter, facilitating its transfer out of the tank. Filter holes at the bottom of the filter grooves filter the special oil, ensuring filtration effectiveness.

[0011] Preferably, the bottom surface of the fixed block is provided with a relief groove, the top of the movable block is provided with a slot, the slot is connected to the relief groove, a detachable filter screen is connected inside the filter groove, the filter hole is a conical hole, the large diameter end of the filter hole faces the filter screen, the inner diameter of the filter screen is smaller than the inner diameter of the large diameter end of the filter hole, and the mesh of the filter screen is connected with several barbs. After filtration and collection, the filter plates are adjusted to a horizontal position by rotating the motor. The clearance groove on the fixed block and the locking groove on the moving block engage with each other, ensuring that the filter plates on the fixed block and the moving block are on the same horizontal plane. This guarantees the subsequent cooperation between the filter plates and the pressing plates, ensuring the filtration effect. The filter holes are tapered, allowing special oils to pass through them. A filter screen is installed inside the filter tank to improve the filtration and collection effect. The inner diameter of the filter screen's mesh is smaller than the inner diameter of the filter holes, ensuring the filter screen's filtration effect. This allows for better filtration and collection of particulate matter in the special oil within the oil tank, ensuring the filtration effect. The added barbs hook the particulate matter in the special oil as it passes through the filter screen, improving the filtration and collection effect and ensuring filtration efficiency.

[0012] Preferably, a guide block is provided in the middle of the pressing plate, and a telescopic cylinder is connected to the top of the guide block and the top of the guide groove. A pressing block is provided at the bottom of the pressing plate, and the pressing block corresponds to the filter groove. A buffer spring is connected to the top of the fixed block, and a buffer plate is connected to the buffer spring, which corresponds to the guide block. The guide block in the middle of the pressing plate allows the pressing plate to move up and down along the guide groove under the action of the telescopic cylinder. Several pressing blocks are provided below the pressing plate, so that after the pressing plate moves down, the pressing blocks cooperate with the filter plate. The pressing blocks contact the particles collected in the filter groove and perform pressing, pressing out the special oil in the particles, achieving a good filtration effect. The buffer spring and buffer plate can buffer the pressing plate when it moves down, ensuring the cooperation between the pressing blocks and the filter plate, achieving a good pressing effect, and ensuring the filtration effect.

[0013] Preferably, the upper end of the rotating rod is provided with a mounting groove, and the top of the oil tank is provided with a mounting hole. The inner wall of the mounting hole is embedded in the mounting groove. A drive motor is connected to the top of the rotating rod, and the drive motor is connected to the top of the oil tank. The mounting groove of the rotating rod matches and is sleeved with the mounting hole on the top of the oil tank. The drive motor is installed on the top of the oil tank, and the drive motor can drive the rotating rod to rotate, thereby driving the filter plate to rotate in the special oil and ensuring the filtration effect.

[0014] Preferably, the air inlet pipe is J-shaped, with its end positioned at the bottom of the oil tank. The J-shape and bottom placement of the air inlet pipe allow the incoming gas to move upwards from the bottom of the tank. This gas entry agitates the special oil, increasing its movement and thus improving the gas filtration effect. This ensures that VOCs and paint particles contained in the gas are fully retained within the special oil, enhancing the gas absorption and filtration efficiency.

[0015] Preferably, the heating element assembly includes a connecting block and several heating elements. A rotating motor is connected to the outside of the flash tank. The rotating shaft of the motor is horizontally inserted into the flash tank and connected to the connecting block. The heating elements are connected to the connecting block and evenly arranged, and are positioned below the liquid inlet pipe. The heating element assembly consists of a connecting block and heating elements, with the heating elements mounted on the connecting block. The rotating motor is mounted on the outside of the flash tank, with its rotating shaft extending into the flash tank and connected to the connecting block, driving the heating elements to rotate. This heats the mixture entering the flash tank, causing the solvent components in the mixture to become gaseous, thus improving the separation effect.

[0016] Preferably, the condenser plate is an inverted V-shaped plate, and its lower surface is provided with a plurality of evenly arranged condensation grooves. The V-shape of the condenser plate and the condensation grooves on its lower surface serve to guide the condensation flow, while also increasing the condensation area and condensation effect, thus ensuring the separation effect.

[0017] Preferably, the inner wall of the buffer chamber is provided with a heat insulation layer, and a manifold plate with a V-shaped cross-section is provided at the top of the buffer chamber. The manifold plate has a manifold hole and is positioned below the end of the condenser plate. The heat insulation layer serves to insulate the flash tank from the buffer chamber, ensuring that the temperature inside the buffer chamber is not affected by the temperature of the flash tank, thus maintaining a suitable temperature for collecting the condensed solvent liquid and ensuring separation efficiency. The manifold plate has a V-shaped cross-section and a manifold hole at its bottom, which collects the solvent liquid flowing into the buffer chamber for easy collection.

[0018] The beneficial effects of this invention are:

[0019] 1. Exhaust gas passes sequentially through a series of oil tanks, undergoing multiple filtrations to ensure effective absorption and purification. The multiple filtrations enhance the removal of particulate matter. The filter plates, adjustable via a rotating motor, optimize the filtration and recovery of particulate matter from the special oil. The filter plates rotate with a rotating rod, further improving filtration efficiency. Filter grooves with removable filter screens are installed on the filter plates, allowing them to collect particulate matter from the special oil into the grooves during rotation. The removable filter screens allow for the removal of collected particulate matter from the oil tank after a certain amount has been collected. The filter screens are equipped with barbs to further enhance filtration. The filtration assembly on the rotating rod consists of a fixed filter unit and a moving filter unit. After filtration and recovery, the filter plates on both units form a flat surface. A pressing plate above the rotating rod presses down, squeezing out the special oil from the collected particulate matter and facilitating subsequent cleaning.

[0020] 2. The buffer chamber is connected to the flash tank. The rotatable heating plate assembly inside the flash tank can rotate while heating, which improves the evaporation of solvent in the mixed liquid and enhances the separation effect. The condenser plate and manifold plate in the buffer chamber can quickly condense the gaseous solvent into liquid and collect it, which facilitates solvent recovery and improves the separation effect. Attached Figure Description

[0021] Figure 1 This is the front view of the present invention;

[0022] Figure 2 This is a cross-sectional view of the absorption device of the present invention;

[0023] Figure 3 This is a perspective view of the rotating rod and filter assembly of the present invention;

[0024] Figure 4 This is a cross-sectional view of the rotating rod and filter assembly of the present invention;

[0025] Figure 5 yes Figure 4 Enlarged view of point A in the middle;

[0026] Figure 6 This is a cross-sectional view of the desorption device in this invention. Figure 1 ;

[0027] Figure 7 This is a cross-sectional view of the desorption device in this invention. Figure 2 ;

[0028] Figure 8 This is a three-dimensional view of the condenser plate in this invention.

[0029] Attached Figure

[0030] 1. Oil tank body; 2. Air outlet pipe; 3. Air inlet pipe; 4. Rotating rod; 5. Filter assembly; 6. Pressing plate; 7. Flash tank; 8. Buffer chamber; 9. Heating element assembly; 10. Mounting hole; 40. Guide groove; 41. Mounting groove; 42. Drive motor; 50. Fixed block; 51. Moving block; 52. Filter plate; 53. Filter groove; 54. Filter hole; 55. Filter screen; 60. Guide block; 61. Pressing plate. 70. Press block, 71. Liquid inlet pipe, 72. Vacuum pump, 73. Connecting hole, 80. Condensing plate, 81. Insulation layer, 82. Condensing tank, 83. Manifold, 84. Manifold hole, 90. Connecting block, 91. Heating element, 92. Rotating motor, 500. Relief groove one, 501. Buffer spring, 502. Buffer plate, 510. Telescopic cylinder one, 511. Slot, 550. Hanging bar, 600. Telescopic cylinder two. Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present application or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0032] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0033] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components illustrated in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0034] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0035] Example 1, as Figure 1-8 As shown, an absorption and desorption process for organic waste gas is characterized in that the organic waste gas consists of paint particles and VOCs, and the absorption and desorption steps are as follows:

[0036] S1. The exhaust gas enters the absorption device, which absorbs VOCs and extracts paint particles using solvent, causing the particles to be removed from the solvent.

[0037] S2. Filter and collect particulate matter;

[0038] S3. Solvent flash desorption.

[0039] The absorption and desorption of organic waste gas is achieved using an absorption and desorption device. This device includes an absorption unit and a desorption unit. The absorption unit consists of several oil tanks 1 connected in series. One end of each oil tank 1 has an outlet pipe 2 at its top, and the other end has an inlet pipe 3 connected to its side wall. A rotatable rotating rod 4 is connected to the top of each oil tank 1. The rotating rod 4 is housed inside the oil tank 1. Several adjustable-angle filter components 5 are connected to the lower end of the rotating rod 4. A movable pressing plate 6 is connected to the upper end of the rotating rod 4. The pressing plate 6 corresponds to the filter components 5. The desorption device includes a flash tank 7. A buffer chamber 8 is located on the outside of the flash tank 7. An inlet pipe 70, penetrating the buffer chamber 8, is connected to the top of the flash tank 7. A vacuum pump 71 is installed on the inlet pipe 70. The inlet pipe 70 communicates with the oil tank 1. A rotatable heating element group 9 is installed inside the flash tank 7. A connecting hole 72 is located at the top of the flash tank 7. The connecting hole 72 is connected to the buffer chamber 8. A condenser plate 80 is provided on the top of the buffer chamber 8.

[0040] The opposing sidewall of the rotating rod 4 is provided with several through guide grooves 40. The filter assembly 5 includes a fixed filter unit and a movable filter unit. The fixed filter unit is provided with a fixed block 50. The fixed block 50 is connected to the middle of the guide groove 40. The movable filter unit is provided with a movable block 51. The movable block 51 is embedded in the guide groove 40. The movable block 51 is located below the fixed block 50 and is arranged perpendicular to the fixed block 50. A telescopic cylinder 510 is connected between the bottom surface of the movable block 51 and the bottom surface of the guide groove 40. The two ends of the fixed block 50 and the movable block 51 are respectively connected to filter plates 52 through a rotating motor. The filter plates 52 are provided with filter grooves 53. The bottom of the filter grooves 53 is provided with several filter holes 54.

[0041] The bottom surface of the fixed block 50 is provided with a clearance groove 500. The top of the movable block 51 is provided with a retaining groove 511. The retaining groove 511 is connected to the clearance groove 500. A detachable filter screen 55 is connected inside the filter tank 53. The filter hole 54 is a conical hole. The larger diameter end of the filter hole 54 faces the filter screen 55. The inner diameter of the mesh of the filter screen 55 is smaller than the inner diameter of the larger diameter end of the filter hole 54. Several barbs 550 are connected to the mesh of the filter screen 55.

[0042] A guide block 60 is provided in the middle of the pressing plate 6. A telescopic cylinder 600 is connected to the top of the guide block 60 and the top of the guide groove 40. A pressing block 61 is provided at the bottom of the pressing plate 6. The pressing block 61 corresponds to the filter groove 53. A buffer spring 501 is connected to the top of the fixing block 50. A buffer plate 502 is connected to the buffer spring 501. The buffer plate 502 corresponds to the guide block 60.

[0043] The upper end of the rotating rod 4 is provided with a mounting groove 41. The top of the oil tank body 1 is provided with a mounting hole 10. The inner wall of the mounting hole 10 is embedded in the mounting groove 41. The top end of the rotating rod 4 is connected to a drive motor 42. The drive motor 42 is connected to the top of the oil tank body 1.

[0044] The air intake pipe 3 is J-shaped. The end of the air intake pipe 3 is located at the bottom of the oil tank body 1.

[0045] The heating element assembly 9 includes a connecting block 90 and several heating elements 91. A rotating motor 92 is externally connected to the flash tank 7. The shaft of the rotating motor 92 is horizontally inserted into the flash tank 7 and connected to the connecting block 90. ​​The heating elements 91 are connected to the connecting block 90 and are evenly arranged. The heating elements 91 are positioned below the liquid inlet pipe 70.

[0046] The condenser plate 80 is an inverted V-shaped plate. The lower surface of the condenser plate 80 is provided with several evenly arranged condensation grooves 82.

[0047] A heat insulation layer 81 is provided on the inner wall of the buffer cavity 8. A flow manifold 83 is provided at the top of the buffer cavity 8. The flow manifold 83 has a V-shaped cross-section. The flow manifold 83 is provided with a flow manifold hole 84. The flow manifold 83 is located below the end of the condenser plate 80.

[0048] The working principle of this invention is as follows: Figure 1-8 As shown, the oil tank 1 has a tank-shaped structure. An outlet pipe 2 is installed on the top of the oil tank 1 at one end of the series connection. An inlet pipe 3 is connected to the side wall of the oil tank 1 at the other end of the series connection. The inlet pipe 3 is J-shaped, with its end close to the bottom of the oil tank 1, ensuring that the gas exiting from the inlet pipe 3 can move from the bottom to the top of the oil tank 1, ensuring that the gas is filtered by the special oil in the oil tank 1. Adjacent oil tanks are connected by a connecting pipe. The connecting pipe has the same structure as the inlet pipe, both being J-shaped, with one end of the connecting pipe placed at the bottom of the oil tank 1 and the other end placed at the top of the side wall of the oil tank 1. A vertically arranged rotating rod 4 is installed inside the oil tank 1. A mounting groove 41 is provided on the upper part of the rotating rod 4, and a mounting hole 10 is provided on the top of the oil tank 1. The side wall of the mounting hole 10 is inserted into the mounting groove 41 for snap-fit ​​installation. A drive motor is installed on the top of the oil tank 1, and the drive motor is connected to the rotating rod 4 to drive the rotating rod 4 to rotate. A guide groove 40 is provided on the rotating rod 4, wherein the guide groove 40 allows the opposing sidewalls to pass through, and the cross section of the guide groove 40 is cross-shaped. A filter assembly 5 is connected to the rotating rod 4, wherein the filter assembly 5 consists of a fixed filter unit and a movable filter unit. The fixed filter unit includes a fixed block 50, and the movable filter unit includes a movable block 51. The fixed block 50 is installed in the middle of the guide groove 40, and the movable block 51 is located below the fixed block 50, arranged perpendicularly to the fixed block 50, and can slide along the guide groove 40. A telescopic cylinder 510 is connected to the lower end of the movable block 51, one end of which is fixed to the bottom of the guide groove 40. The telescopic movement of the cylinder can drive the movable block 51 to slide up and down along the guide groove 40. A rotary motor is installed at both ends of the fixed block 50 and the movable block 51, and a filter plate 52 is installed at the shaft end of the rotary motor. By adjusting the rotation angle of the rotating motor, the filter plate 52 can be adjusted to a certain tilt angle, achieving filtration as it rotates with the rotating rod 4. A filter groove 53 is provided on the filter plate 52, and several filter holes 54, which are conical, are provided at the bottom of the filter groove 53. A grooved filter screen 55 is installed inside the filter groove 53, its shape matching the inner cavity of the filter groove 53. The filter screen 55 is detachably connected to the filter groove 53 using screws. The inner diameter of the mesh openings of the filter screen 55 is smaller than the inner diameter of the filter holes 54. Barbs 550 are provided on the inner wall of the mesh openings of the filter screen 55. These barbs 550 can hook and trap particulate matter in the special oil as it passes through the filter screen 55, improving the filtration and collection effect and ensuring filtration efficiency.

[0049] A clearance groove 500 is provided at the bottom of the fixed block 50, and a slot 511 is provided at the top of the movable block 51. The movable block 51 moves upward so that the slot 511 can engage with the clearance groove 500. Before engaging, the filter plate 52 connected to the fixed block 50 and the movable block 51 needs to be adjusted to a horizontal position by adjusting the rotation motor. By engaging the movable block 51 with the fixed block 50, the filter plates 52 of the fixed block 50 and the movable block 51 are placed on the same plane. A pressing plate 6 is provided at the upper end of the rotating rod 4. A telescopic cylinder 600 is provided between the pressing plate 6 and the top of the guide groove 40. At the same time, a guide block 60 is provided in the middle of the pressing plate 6. The guide block 60 is cross-shaped and is embedded in the guide groove 40. The telescopic movement of the telescopic cylinder 600 can drive the pressing plate 6 to move downward. Several pressing blocks 61 are provided on the lower surface of the pressing plate 6. The outer contour of the pressing blocks 61 is the same as the inner contour of the filter tank 53. When the pressing plate 6 moves down to a certain position, the pressing blocks 61 enter the filter tank 53 to press the particles collected in the filter tank 53 and squeeze out the special oil in the filter tank 53, thereby improving the filtration effect. A buffer spring 501 is connected to the upper surface of the fixed block 50. The buffer spring 501 is connected to the buffer plate 502. When the pressing plate 6 moves down to press, the guide block 60 contacts the buffer plate 502. The buffer spring 501 plays a certain buffering role, so that the pressing plate 6 can move down slowly when pressing downward, which prolongs the pressing process, ensures the pressing effect, and improves the filtration effect.

[0050] A buffer chamber 8 is fitted around the outside of the flash tank 7. A connecting hole 72 is provided at the top of the flash tank 7, connecting the flash tank 7 and the buffer chamber 8. An inlet pipe 70 is connected to the top of the flash tank 7, passing through the buffer chamber 8. A vacuum pump 71 is installed on the inlet pipe 70, which is used to draw the mixture in the oil tank 1 into the flash tank 7. A rotary motor 92 is installed on the outer wall of the flash tank 7. The shaft of the rotary motor 92 passes through the buffer chamber 8 and enters the flash tank 7. A connecting block 90 is installed on the rotary motor 92, and several evenly arranged heating elements 91 are connected to the connecting block 90. ​​The rotary motor 92 can drive the heating elements 91 to rotate. The connecting block 90 is positioned below the inlet pipe. When the mixed liquid flows out of the inlet pipe 70, it comes into contact with the rotating heating element 91. Due to the low pressure inside the flash tank 7, the solvent mixed in the mixed liquid can be rapidly vaporized after entering the flash tank 7, achieving separation of the solvent and the absorbent oil and improving the separation effect. A condensing plate 80 is provided at the top of the buffer chamber 8. The condensing plate 80 is V-shaped, and several condensing grooves 82 are provided on the bottom surface of the condensing plate 80. The condensing grooves 82 can increase the condensation area and improve the condensation efficiency. At the same time, the condensing grooves 82 also guide the condensed solvent liquid along the condensing grooves 82 to the manifold 83 provided below the condensing plate 80. The manifold 83 has a V-shaped cross-section, and a manifold hole 84 is provided at the bottom of the manifold 83. The manifold hole 84 collects and recovers the solvent liquid flowing down from the condensing plate 80. An insulation layer 81 is provided on the inner side of the buffer chamber 8. The insulation layer 81 isolates the flash tank 7 from the buffer chamber 8, so that the temperature inside the buffer chamber 8 is lower than the temperature inside the flash tank 7, thus achieving a better condensation effect.

[0051] The main working steps of this invention are as follows: Exhaust gas enters the oil tank 1 through the inlet pipe 3. The exhaust gas is filtered by the special oil in the oil tank 1, which absorbs VOCs and paint particles. The paint particles are extracted by the solvent in the special oil, resulting in solvent removal and suspension of the particles within the special oil. The exhaust gas passes through the series of oil tanks 1, further enhancing the filtration effect. A telescopic cylinder 510 moves the moving block 51 downwards to a certain position. The rotating motor is adjusted to rotate the filter plate 52 at a certain angle. The drive motor is then activated, causing the rotating rod 4 to rotate. The rotating rod 4 rotates the filter plate 52. The filter screen 55 installed on the filter plate 52 filters the special oil and collects the particles within it. The barbs 550 installed within the mesh of the filter screen 55 further improve the filtration and collection effect. After a certain period of filtration and collection, the special oil in oil tank 1 is discharged. The rotating motor is adjusted to make the filter plate 52 flip to a horizontal position. The telescopic cylinder 510 pushes the moving block 51 upward, and the slot 511 and the clearance slot 500 engage, making the filter plate 52 installed on the fixed block 50 and the filter plate 52 installed on the moving block 51 planar. At the same time, the telescopic cylinder 600 drives the pressing plate 6 to move downward, embedding the pressing block 61 on the lower surface of the pressing plate 6 into the filter groove 53, pressing the particles collected in the filter groove 53, and discharging the special oil in the filter groove 53, thus improving the filtration effect. When the pressing plate 6 moves down to a certain position, the guide block 60 of the pressing plate 6 contacts the buffer plate 502, slowing down the downward movement of the pressing plate 6, allowing the pressing plate 6 to better press the collected particles and ensure the pressing and filtration effect.

[0052] Under the action of vacuum pump 71, the filtered absorbent oil in oil tank 1 is drawn into flash tank 7. The absorbent oil entering flash tank 7 passes through rotating heating plate 91, which vaporizes the solvent components in the absorbent oil. The vaporized components enter buffer chamber 8 through the connecting hole 70 of flash tank 7, and are liquefied and collected by condenser plate 80 and manifold 83 in buffer chamber 8. At the same time, pure absorbent oil is left in flash tank 7. After flash evaporation, the absorbent oil is transferred back to oil tank 1 for recycling.

[0053] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An absorption and desorption process for organic waste gas, characterized in that, Organic waste gas consists of paint particles and VOCs. The absorption and desorption steps are as follows: S1. The exhaust gas enters the absorption device, which absorbs VOCs and extracts paint particles using solvent, causing the particles to be removed from the solvent. S2. Filter and collect particulate matter; S3. Solvent flash desorption The absorption and desorption of organic waste gas is performed using an absorption and desorption device, which includes an absorption device and a desorption device. The absorption device is equipped with several oil tanks (1) connected in series. One end of the oil tank (1) is equipped with an outlet pipe (2) at the top, and the other end of the oil tank (1) is connected to an inlet pipe (3) on the side wall. The top of the oil tank (1) is connected to a rotatable rotating rod (4), which is placed inside the oil tank (1). The lower end of the rotating rod (4) is connected to several adjustable-angle filter components (5), and the upper end of the rotating rod (4) is connected to a movable pressing plate (6). The pressing plate (6) corresponds to the filter components (5). The desorption device is equipped with a flash evaporator (7), and the outside of the flash evaporator (7) is equipped with... A buffer chamber (8) is provided. The top of the flash tank (7) is connected to an inlet pipe (70) that penetrates the buffer chamber (8). A vacuum pump (71) is installed on the inlet pipe (70). The inlet pipe (70) is connected to the oil tank body (1). A rotatable heating element group (9) is provided inside the flash tank (7). A connecting hole (72) is provided at the top of the flash tank (7). The connecting hole (72) is connected to the buffer chamber (8). A condenser plate (80) is provided at the top of the buffer chamber (8). Several through guide grooves (40) are provided on the opposite side wall of the rotating rod (4). The filter assembly (5) includes a fixed filter unit and a movable filter unit. The fixed filter unit is provided with a fixing block (50). The fixing block (50) is connected to... The movable filter unit is provided with a movable block (51) in the middle of the guide slide (40). The movable block (51) is embedded in the guide slide (40) and is located below the fixed block (50) and arranged perpendicularly to the fixed block (50). A telescopic cylinder (510) is connected between the bottom surface of the movable block (51) and the bottom surface of the guide slide (40). The two ends of the fixed block (50) and the movable block (51) are respectively connected to filter plates (52) through a rotating motor. The filter plate (52) is provided with a filter groove (53). The bottom of the filter groove (53) is provided with a plurality of filter holes (54). The bottom surface of the fixed block (50) is provided with a clearance groove (500). The top of the movable block (51) is provided with a... The card slot (511) is connected to the first relief groove (500). A detachable filter screen (55) is connected inside the filter groove (53). The filter hole (54) is a conical hole. The large diameter end of the filter hole (54) faces the filter screen (55). The inner diameter of the mesh of the filter screen (55) is smaller than the inner diameter of the large diameter end of the filter hole (54). Several barbs (550) are connected to the mesh of the filter screen (55). A guide block (60) is provided in the middle of the pressing plate (6). The top of the guide block (60) is connected to the top of the guide slide groove (40) by a telescopic cylinder (600). A pressing block (61) is provided at the bottom of the pressing plate (6). The pressing block (61) corresponds to the filter groove (53).A buffer spring (501) is connected to the top of the fixed block (50), and a buffer plate (502) is connected to the buffer spring (501). The buffer plate (502) corresponds to the guide block (60).

2. The absorption and desorption process for organic waste gas according to claim 1, characterized in that, The upper end of the rotating rod (4) is provided with an installation groove (41), and the top of the oil tank (1) is provided with an installation hole (10). The inner wall of the installation hole (10) is embedded in the installation groove (41). The top end of the rotating rod (4) is connected to a drive motor (42), and the drive motor (42) is connected to the top of the oil tank (1).

3. The absorption and desorption process for organic waste gas according to claim 1, characterized in that, The air inlet pipe (3) is J-shaped, and the end of the air inlet pipe (3) is placed at the bottom of the oil tank body (1).

4. The absorption and desorption process for organic waste gas according to claim 1, characterized in that, The heating element group (9) includes a connecting block (90) and several heating elements (91). A rotating motor (92) is connected to the outside of the flash tank (7). The rotating shaft of the rotating motor (92) is horizontally inserted into the flash tank (7) and connected to the connecting block (90). Several heating elements (91) are connected to the connecting block (90) and evenly arranged. The heating elements (91) are placed below the liquid inlet pipe (70).

5. The absorption and desorption process for organic waste gas according to claim 1, characterized in that, The condenser plate (80) is an inverted V-shaped plate, and the lower surface of the condenser plate (80) is provided with a plurality of evenly arranged condenser grooves (82).

6. The absorption and desorption process for organic waste gas according to claim 1, characterized in that, The inner wall of the buffer cavity (8) is provided with a heat insulation layer (81), and a flow-collecting plate (83) is provided at the top of the buffer cavity (8). The flow-collecting plate (83) has a V-shaped cross section and a flow-collecting hole (84). The flow-collecting plate (83) is located below the end of the condenser plate (80).

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