A waste gas recovery filtration method

Abstract

The application discloses a waste gas recovery filtering method, which adopts a filtering device to filter, guides the waste gas into a gas guide box, and then the waste gas entering from the gas guide box enters a first area through a guide piece and is preliminarily treated by a treatment liquid in the first area. Then, the waste gas enters a first box body, a second box body, a first exhaust box and a second exhaust box to meet the demand of different filtering and is diverted to absorb different toxic substances. The waste gas recovery filtering method realizes the absorption and dust reduction of the waste gas through multi-stage filtering treatment. Meanwhile, the first box body, the second box body, the first exhaust box and the second exhaust box can be quickly unfolded through a movable mechanism, the reaction liquid or filtering substance can be conveniently replaced, the reaction liquid or filtering substance can be timely cleaned, the quick expansion is realized, the unfolding efficiency of the equipment is improved, the reaction substance can be quickly added, and the waste gas recovery treatment efficiency is improved.

Description

Technical Field

[0001] This invention relates to waste gas treatment technology, and more particularly to a waste gas recovery and filtration method. Background Technology

[0002] During waste recycling, significant amounts of dust and toxic gases are generated during crushing and heavy metal recovery. Timely filtration and recycling are essential to ensure safe emissions. Currently, most waste recycling filtration equipment employs a closed structure, making disassembly and cleaning after prolonged use, or the addition of reactive substances, inconvenient and resulting in excessively large and difficult-to-operate equipment.

[0003] CN115671893A discloses a new energy exhaust gas filter and filtration method, which employs an exhaust gas treatment box, a physical filtration mechanism, a rotating frame, a transmission mechanism, a rotating mechanism, a fully mixing reaction mechanism, a secondary reaction filtration mechanism, and an intermittent exhaust mechanism. This allows for thorough mixing of the exhaust gas and reactants. Simultaneously, as the rotating frame rotates, the gas treated by the reactants is re-drawn into the reactants, thus achieving secondary filtration of the exhaust gas. However, after long-term use, it becomes difficult to disassemble and clean the internal structure, and it cannot be used to reroute and treat special gases, affecting the efficiency of exhaust gas recovery and filtration. Summary of the Invention

[0004] To address the shortcomings of the existing technology, this invention proposes a waste gas recovery and filtration method.

[0005] The technical solution of this invention is implemented as follows:

[0006] A waste gas recovery and filtration method, characterized by employing a filtration device for filtration, specifically includes the following steps:

[0007] Step 1: Guide the exhaust gas into the air guide box. The exhaust gas entering from the air guide box enters the first area through the guide component, and the exhaust gas is initially treated by the treatment liquid in the first area.

[0008] Step 2: The exhaust gas discharged from the first area enters the first chamber. The first chamber can perform preliminary separation of the treatment liquid carried in the exhaust gas, and the separated treatment liquid re-enters the first area.

[0009] Step 3: The exhaust gas discharged from the first chamber enters the second chamber, which is equipped with filter material to filter and absorb the toxic gases in the exhaust gas.

[0010] Step 4: The exhaust gas discharged from the first box can also enter the first exhaust box. The lower end of the first exhaust box is provided with a first air inlet, which is connected to the first box.

[0011] Step 5: The exhaust gas discharged from the second chamber enters the second exhaust box. The lower end of the second exhaust box is equipped with a second air inlet, which is connected to the second chamber.

[0012] The first housing has a first notch, and the second housing has a second notch. A barrier is provided on both the first and second notches, and a first cylinder is located at the upper end of the barrier.

[0013] The air guide box has movable mechanisms at both ends, which are used to open and close the first box, the second box, the first exhaust box, and the second exhaust box. The upper end of the movable mechanism is connected by a pressure rod. The blocking member is located in the middle of the pressure rod and can move in the middle of the pressure rod. The upper end of the pressure rod is provided with a second cylinder. The movable mechanism has a symmetrical first hinge assembly and a second hinge assembly. The first hinge assembly has a first half gear, a first drive rod, a first connecting rod, and a first hinge rod. The second hinge assembly has a second half gear, a second drive rod, a second connecting rod, and a second hinge rod. The first half gear and the second half gear are connected by tooth meshing. One end of the first drive rod is hinged to the first half gear, and one end of the second drive rod is hinged to the second half gear. The other ends of the first drive rod and the second drive rod are hinged to one end of the pressure rod. When the pressure rod is pressed down, the first drive rod can drive the first half gear to rotate, and the second drive rod can drive the second half gear to rotate.

[0014] In this invention, the first half gear is provided with a first support rod and a first push rod, and the second half gear is provided with a second support rod and a second push rod. One end of the first support rod is connected to the first half gear, and the other end is hinged to the first housing. One end of the first push rod is connected to the first half gear, and the other end of the first push rod is hinged to the lower end of the first drive rod. One end of the second support rod is connected to the second half gear, and the other end is hinged to the second housing. One end of the second push rod is connected to the second half gear, and the other end is hinged to the lower end of the second drive rod.

[0015] In this invention, one end of the first connecting rod is hinged to the air guide box, the middle is hinged to the first box body, and the other end is hinged to the first exhaust box. One end of the second connecting rod is hinged to the air guide box, the middle is hinged to the second box body, and the other end is hinged to the second exhaust box. One end of the first hinge rod is hinged to the first box body, and the other end is hinged to the first exhaust box. One end of the second hinge rod is hinged to the second box body, and the other end is hinged to the second exhaust box.

[0016] In this invention, the lower end of the barrier is provided with a connecting member, the connecting member is provided with a sliding hole, the barrier slides in the sliding hole, the middle of the connecting member is provided with a through hole, the through hole communicates with the sliding hole, the lower end of the barrier is provided with a protrusion, the protrusion is located in the through hole, and the width of the protrusion is greater than the width of the sliding hole.

[0017] In this invention, the air guide box has a partition plate inside, the middle of the partition plate forms a first region, one end of the guide member is installed on the partition plate, and the interior of the guide member is hollowed out, and the other end is connected to the interior of the air guide box through the partition plate. The guide member has a flat part, and the flat part has multiple air holes.

[0018] In this invention, the air guide box has a support ring inside, a sealing element is provided on the support ring, positioning holes are provided at the four corners of the support ring, and positioning pins that cooperate with the positioning holes are provided on the sealing element.

[0019] In this invention, the upper end of the sealing element is provided with a sealing part, the lower end of the first housing and the second housing is provided with a pressure groove that cooperates with the sealing part, the middle of the pressure groove is provided with a downwardly extending pressure part, the middle of the sealing part is provided with a partition part, the middle of the partition part is provided with a receiving opening, the upper end of the partition plate is placed in the receiving opening, the upper end of the partition part is also provided with a sealing sheet, the sealing sheet is located between the first housing and the second housing, and the first housing and the second housing are provided with a recessed area for receiving the sealing sheet.

[0020] In this invention, the first housing is provided with an air inlet, a partition plate is provided at the air inlet, an arc-shaped plate is provided on the partition plate, and a plurality of serrated portions are provided on the inner wall of the arc-shaped plate.

[0021] In this invention, inclined guide surfaces are provided on both sides of the air inlet, and the guide surfaces are located at the lower end of the arc-shaped plate.

[0022] In this invention, the first exhaust box and the second exhaust box are provided with a cover plate, the cover plate is composed of a cover body and an arc-shaped body, the arc-shaped body is hinged to the first exhaust box and / or the second exhaust box, and the cover body is provided with a counterweight.

[0023] The waste gas recovery and filtration method of this invention has the following beneficial effects: This waste gas recovery and filtration method achieves absorption and dust reduction of waste gas through multi-stage filtration. Simultaneously, it allows for the rapid deployment of the first chamber, second chamber, first exhaust box, and second exhaust box via a movable mechanism, facilitating the replacement of reaction liquid or filter material, timely cleaning, rapid expansion, improved equipment deployment efficiency, and rapid addition of reaction material, thereby accelerating the waste gas recovery and treatment efficiency. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the waste gas recovery and filtration method of the present invention;

[0025] Figure 2 for Figure 1 The main view;

[0026] Figure 3 for Figure 1 Cross-sectional view;

[0027] Figure 4 for Figure 1 Exploded view of the air guide box and sealing components in the diagram;

[0028] Figure 5 for Figure 4 Cross-sectional view of the sealing component structure in the middle;

[0029] Figure 6 for Figure 4 A schematic diagram of the air guide box structure in the middle;

[0030] Figure 7 for Figure 1 Cross-sectional view of the first box structure in the middle;

[0031] Figure 8 This is a schematic diagram of the active mechanism structure in this invention;

[0032] Figure 9 This is a perspective view of the barrier and connecting member structure in this invention;

[0033] Figure 10 for Figure 1 A schematic diagram of the first box structure in the diagram.

[0034] In the diagram: Filter device 101, air guide box 1, first box 2, second box 3, first exhaust box 4, second exhaust box 5, moving mechanism 6, barrier 7, guide 8, first area 9, second cylinder 10, first hinge assembly 11, second hinge assembly 111, partition plate 12, connecting member 13, flat part 14, air hole 15, first notch 16, second notch 17, first cylinder 18, fixing plate 19, sliding hole 20, through hole 21, protrusion 22, cover plate 23, support ring 24, seal 25, positioning hole 26, positioning post 27, sealing part 2 8. Pressure groove 29, pressure part 30, partition part 31, receiving port 32, sealing plate 33, recessed area 34, air inlet 35, partition plate 36, arc plate 37, serrated part 38, guide surface 39, cover 40, arc body 41, counterweight block 42, pressure rod 43, first half gear 44, first drive rod 45, first connecting rod 46, first hinge rod 47, second half gear 48, second drive rod 49, second connecting rod 50, second hinge rod 51, first support rod 52, first push rod 53, second support rod 54, second push rod 55, connecting hole 56. Detailed Implementation

[0035] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0036] like Figures 1 to 10 As shown, this waste gas recovery and filtration method of the present invention uses a filtration device 101 for filtration. The filtration device 101 includes a gas guide box 1, a first box 2, a second box 3, a first exhaust box 4, a second exhaust box 5, a movable mechanism 6, and a barrier 7. The gas guide box 1 is used to guide the gas to be recovered and filtered, allowing it to enter the gas guide box 1, and then enter the first region 9 through the guide 8. Different reaction liquids can be set in the first region 9 according to different gases. Then, the gas discharged from the first region 9 can enter the first exhaust box 4 or the second box 3, so as to realize that the gas enters into different channels, change the gas's forward path, and recover and filter different substances in the gas.

[0037] The first chamber 2, the second chamber 3, the first exhaust chamber 4, and the second exhaust chamber 5 are mounted on the air guide box 1 via the movable mechanism 6. The movable mechanism 6 can be driven by the second cylinder 10 to unfold the hinge assembly 11, thereby pushing the first chamber 2, the second chamber 3, the first exhaust chamber 4, and the second exhaust chamber 5 to clean the interior or add reaction liquid.

[0038] The interior of the air guide box 1 is hollowed out, and a partition plate 12 is provided inside the air guide box 1. The middle of the partition plate 12 forms a first region 9. The first region 9 can be used to perform preliminary treatment on the incoming gas, and then perform separate treatment or centralized treatment. It is only necessary to change the position of the barrier 7 in the connecting member 13.

[0039] One end of the guide member 8 is mounted on the partition plate 12, and the interior of the guide member 8 is hollowed out. The other end is connected to the interior of the gas guide box 1 through the partition plate 12. The guide member 8 is provided with a flat part 14, and the flat part 14 is provided with multiple air holes 15. The gas entering from the guide member 8 is discharged from the air holes 15 and then reacted and processed in the first region 9.

[0040] Both the first housing 2 and the second housing 3 have openings at their top ends to facilitate cleaning of the interior after unfolding. The first housing 2 has a first notch 16, and the second housing 3 has a second notch 17, with the first notch 16 and the second notch 17 connected.

[0041] A connecting hole 56 is provided on the first exhaust box 4 and the second exhaust box 5. The connecting hole 56 is used to connect the first exhaust box 4 with the first box 2 and the second exhaust box 5 with the second box 3.

[0042] A barrier 7 is provided on the first notch 16 and the second notch 17. A first cylinder 18 is provided at the upper end of the barrier 7. The first cylinder 18 and the second cylinder 10 are mounted on the fixed plate 19. A connecting member 13 is provided at the lower end of the barrier 7. A sliding hole 20 is provided on the connecting member 13. The barrier 7 slides in the sliding hole 20. A through hole 21 is provided in the middle of the connecting member 13. The through hole 21 communicates with the sliding hole 20. A protrusion 22 is provided at the lower end of the barrier 7. The protrusion 22 is located in the through hole 21. The width of the protrusion 22 is greater than the width of the sliding hole 20.

[0043] By pulling the barrier 7 with the first cylinder 18, the barrier 7 can move inside the through hole 21, thereby connecting the first notch 16 and the second notch 17, so that the gas inside the first box 2 can enter the second box 3.

[0044] The cover plate 23 on the first exhaust box 4 and the second exhaust box 5 is opened by high pressure gas. When the second cylinder 10 drives the blocking component 7 to move, the first notch 16 and the second notch 17 are connected, which causes the air pressure inside the first box 2 to drop. As a result, the gas cannot open the cover plate 23 on the first exhaust box 4, and the gas will enter the second box 3 for filtration.

[0045] The air guide box 1 has a support ring 24 inside, and a sealing element 25 is provided on the support ring 24. Positioning holes 26 are provided at the four corners of the support ring 24, and positioning pins 27 that mate with the positioning holes 26 are provided on the sealing element 25. The cooperation between the sealing element 25 and the support ring 24 achieves a seal.

[0046] The upper end of the seal 25 is provided with a sealing part 28. The lower end of the first housing 2 and the second housing 3 is provided with a pressure groove 29 that cooperates with the sealing part 28. The middle of the pressure groove 29 is provided with a downwardly extending pressure part 30. The middle of the sealing part 28 is provided with a partition part 31. The middle of the partition part 31 is provided with a receiving opening 32. The upper end of the partition plate 12 is placed in the receiving opening 32. The upper end of the partition part 31 is also provided with a sealing piece 33. The sealing piece 33 is located between the first housing 2 and the second housing 3. The first housing 2 and the second housing 3 are provided with a recessed area 34 for receiving the sealing piece 33.

[0047] Since the height of the sealing part 28 is higher than the height of the air guide box 1, it needs to be pressed onto the air guide box 1 by the first box 2 and the second box 3, thereby forcing the sealing part 28 into the pressure groove 29. The pressure is applied to the sealing part 28 by the pressure applying part 30, causing the middle of the sealing part 28 to be recessed downwards, thus achieving a seal.

[0048] The original shape of the sealing part 28 is a semi-circle. After the pressure is applied by the pressure application part 30, it forms two semi-circles, keeping the sealing part 28 squeezed in the pressure groove 29.

[0049] An air inlet 35 is provided on the first housing 2. A partition plate 36 is provided at the air inlet 35. An arc-shaped plate 37 is provided on the partition plate 36. Multiple serrated sections 38 are provided on the inner wall of the arc-shaped plate 37. Inclined guide surfaces 39 are provided on both sides of the air inlet 35. The guide surfaces 39 are located at the lower end of the arc-shaped plate 37.

[0050] When the gas from the first region 9 enters the first chamber 2 through the air inlet 35, it carries a significant amount of reaction liquid, making the gas quite humid. Upon encountering the sharp serrated edges 38, the gas can condense into water droplets and fall back into the first region 9. Furthermore, because the curved plate 37 is curved, there is a small gap between its two sides and the inner wall of the first chamber 2.

[0051] Meanwhile, the length of the guide surface 39 is greater than half the length of the arc plate 37, so that the reaction liquid dripping from the arc plate 37 can flow from the guide surface 39 into the first region 9.

[0052] The first exhaust box 4 and the second exhaust box 5 are equipped with cover plates 23. The cover plate 23 consists of a cover body 40 and an arc-shaped body 41. The arc-shaped body 41 is hinged to the first exhaust box 4 and / or the second exhaust box 5. A counterweight 42 is provided on the cover body 40. This allows the gas in the first exhaust box 4 to push the cover plate 23 open due to higher gas pressure, causing the arc-shaped body 41 to rotate on the first exhaust box 4. Increasing the weight of the counterweight 42 can change the gas discharge flow rate and the gas pressure of the discharged gas.

[0053] The air guide box 1 has movable mechanisms 6 at both ends. The movable mechanisms 6 are used to open and close the first box 2, the second box 3, the first exhaust box 4, and the second exhaust box 5. The upper end of the movable mechanism 6 is connected by a pressure rod 43. The blocking member 7 is located in the middle of the pressure rod 43 and can move in the middle of the pressure rod 43. The upper end of the pressure rod 43 is provided with a second cylinder 10.

[0054] The movable mechanism 6 includes a symmetrical first hinge assembly 11 and a second hinge assembly 111. The first hinge assembly 11 includes a first half-gear 44, a first drive rod 45, a first connecting rod 46, and a first hinge rod 47. The second hinge assembly 111 includes a second half-gear 48, a second drive rod 49, a second connecting rod 50, and a second hinge rod 51. The first half-gear 44 and the second half-gear 48 are connected by tooth meshing. One end of the first drive rod 45 is hinged to the first half-gear 44, and one end of the second drive rod 49 is hinged to the second half-gear 48. The other ends of the first drive rod 45 and the second drive rod 49 are hinged to one end of the pressure rod 43. When the pressure rod 43 applies downward pressure, the first drive rod 45 can drive the first half-gear 44 to rotate, and the second drive rod 49 can drive the second half-gear 48 to rotate.

[0055] The first half-gear 44 is provided with a first support rod 52 and a first push rod 53, and the second half-gear 48 is provided with a second support rod 54 and a second push rod 55. One end of the first support rod 52 is connected to the first half-gear 44, and the other end is hinged to the first housing 2. One end of the first push rod 53 is connected to the first half-gear 44, and the other end is hinged to the lower end of the first drive rod 45. One end of the second support rod 54 is connected to the second half-gear 48, and the other end is hinged to the second housing 3. One end of the second push rod 55 is connected to the second half-gear 48, and the other end is hinged to the lower end of the second drive rod 49.

[0056] One end of the first connecting rod 46 is hinged to the air guide box 1, the middle is hinged to the first box 2, and the other end is hinged to the first exhaust box 4. One end of the second connecting rod 50 is hinged to the air guide box 1, the middle is hinged to the second box 3, and the other end is hinged to the second exhaust box 5. One end of the first hinge rod 47 is hinged to the first box 2, and the other end is hinged to the first exhaust box 4. One end of the second hinge rod 51 is hinged to the second box 3, and the other end is hinged to the second exhaust box 5.

[0057] Furthermore, the angle between the first support rod 52 and the first push rod 53 is 90°, and the angle between the second support rod 54 and the second push rod 55 is 90°. When the pressure rod 43 moves downward, the first drive rod 45 and the second drive rod 49 are kept moving downward, driving the first half gear 44 and the second half gear 48 to rotate, which in turn drives the first housing 2 and the second housing 3 to move to both sides, and the first exhaust box 4 and the second exhaust box 5 to move to both sides.

[0058] Since the connecting rods and hinge rods of the first housing 2, the second housing 3, the first exhaust box 4, and the second exhaust box 5 are inclined when not deployed, and remain inclined after deployment, the deployment trajectory of the first housing 2, the second housing 3, the first exhaust box 4, and the second exhaust box 5 is arc-shaped. When the connecting rods and hinge rods are in a vertical state, the first housing 2, the second housing 3, the first exhaust box 4, and the second exhaust box 5 are at their highest points.

[0059] The specific steps of the waste gas recovery and filtration method include:

[0060] Step 1: Guide the exhaust gas into the air guide box 1. The exhaust gas entering from the air guide box 1 enters the first area 9 through the guide 8. The exhaust gas is then preliminarily treated by the treatment liquid in the first area 9.

[0061] Step 2: The exhaust gas discharged from the first area 9 enters the first chamber 2. The first chamber 2 can perform preliminary separation of the treatment liquid carried in the exhaust gas, and the separated treatment liquid re-enters the first area 9.

[0062] Step 3: The exhaust gas discharged from the first chamber 2 enters the second chamber 3. The second chamber 3 is equipped with filter material, which can filter and absorb the toxic gases in the exhaust gas.

[0063] Step 4: The exhaust gas discharged from the first housing 2 can also enter the first exhaust box 4. The lower end of the first exhaust box 4 is provided with a first air inlet 35, which is connected to the first housing 2.

[0064] Step 5: The exhaust gas discharged from the second housing 3 enters the second exhaust box 5. The lower end of the second exhaust box 5 is provided with a second air inlet 35, which is connected to the second housing 3.

[0065] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for recovering and filtering waste gas, characterized in that, Filtration using a filtration device specifically includes the following steps: Step 1: Guide the exhaust gas into the air guide box. The exhaust gas entering from the air guide box enters the first area through the guide component, and the exhaust gas is initially treated by the treatment liquid in the first area. Step 2: The exhaust gas discharged from the first area enters the first chamber. The first chamber can perform preliminary separation of the treatment liquid carried in the exhaust gas, and the separated treatment liquid re-enters the first area. Step 3: The exhaust gas discharged from the first chamber enters the second chamber, which is equipped with filter material to filter and absorb the toxic gases in the exhaust gas. Step 4: The exhaust gas discharged from the first box can also enter the first exhaust box. The lower end of the first exhaust box is provided with a first air inlet, which is connected to the first box. Step 5: The exhaust gas discharged from the second chamber enters the second exhaust box. The lower end of the second exhaust box is equipped with a second air inlet, which is connected to the second chamber. The first housing has a first notch, and the second housing has a second notch. A barrier is provided on both the first and second notches, and a first cylinder is located at the upper end of the barrier. The air guide box has movable mechanisms at both ends, which are used to open and close the first box, the second box, the first exhaust box, and the second exhaust box. The upper end of the movable mechanism is connected by a pressure rod. The blocking member is located in the middle of the pressure rod and can move in the middle of the pressure rod. The upper end of the pressure rod is provided with a second cylinder. The movable mechanism has a symmetrical first hinge assembly and a second hinge assembly. The first hinge assembly has a first half gear, a first drive rod, a first connecting rod, and a first hinge rod. The second hinge assembly has a second half gear, a second drive rod, a second connecting rod, and a second hinge rod. The first half gear and the second half gear are connected by tooth meshing. One end of the first drive rod is hinged to the first half gear, and one end of the second drive rod is hinged to the second half gear. The other ends of the first drive rod and the second drive rod are hinged to one end of the pressure rod. When the pressure rod is pressed down, the first drive rod can drive the first half gear to rotate, and the second drive rod can drive the second half gear to rotate.

2. The waste gas recovery and filtration method according to claim 1, characterized in that, The first half gear is provided with a first support rod and a first push rod, and the second half gear is provided with a second support rod and a second push rod. One end of the first support rod is connected to the first half gear and the other end is hinged to the first housing. One end of the first push rod is connected to the first half gear and the other end is hinged to the lower end of the first drive rod. One end of the second support rod is connected to the second half gear and the other end is hinged to the second housing. One end of the second push rod is connected to the second half gear and the other end is hinged to the lower end of the second drive rod.

3. The waste gas recovery and filtration method according to claim 1, characterized in that, One end of the first connecting rod is hinged to the air guide box, the middle is hinged to the first box body, and the other end is hinged to the first exhaust box. One end of the second connecting rod is hinged to the air guide box, the middle is hinged to the second box body, and the other end is hinged to the second exhaust box. One end of the first hinge rod is hinged to the first box body, and the other end is hinged to the first exhaust box. One end of the second hinge rod is hinged to the second box body, and the other end is hinged to the second exhaust box.

4. The waste gas recovery and filtration method according to claim 1, characterized in that, The lower end of the barrier is provided with a connecting member, and the connecting member is provided with a sliding hole. The barrier slides in the sliding hole. The middle of the connecting member is provided with a through hole, which communicates with the sliding hole. The lower end of the barrier is provided with a protrusion, which is located in the through hole. The width of the protrusion is greater than the width of the sliding hole.

5. The waste gas recovery and filtration method according to claim 1, characterized in that, The air guide box has a partition plate inside, and the middle of the partition plate forms a first region. One end of the guide is installed on the partition plate, and the inside of the guide is hollow. The other end is connected to the inside of the air guide box through the partition plate. The guide has a flat part with multiple air holes.

6. The waste gas recovery and filtration method according to claim 5, characterized in that, The air guide box has a support ring inside, a sealing element on the support ring, positioning holes at the four corners of the support ring, and positioning pins on the sealing element that cooperate with the positioning holes.

7. The waste gas recovery and filtration method according to claim 6, characterized in that, The upper end of the sealing element is provided with a sealing part, the lower end of the first box and the second box is provided with a pressure groove that cooperates with the sealing part, the middle of the pressure groove is provided with a downwardly extending pressure part, the middle of the sealing part is provided with a partition part, the middle of the partition part is provided with a receiving opening, the upper end of the partition plate is placed in the receiving opening, the upper end of the partition part is also provided with a sealing sheet, the sealing sheet is located between the first box and the second box, and the first box and the second box are provided with a recessed area for receiving the sealing sheet.

8. The waste gas recovery and filtration method according to claim 1, characterized in that, The first housing is provided with an air inlet, and a partition plate is provided at the air inlet. An arc-shaped plate is provided on the partition plate, and multiple serrated sections are provided on the inner wall of the arc-shaped plate.

9. The waste gas recovery and filtration method according to claim 8, characterized in that, The air inlet has inclined guide surfaces on both sides, and the guide surfaces are located at the lower end of the arc-shaped plate.

10. The waste gas recovery and filtration method according to claim 1, characterized in that, The first exhaust box and the second exhaust box are provided with cover plates. The cover plates are composed of a cover body and an arc-shaped body. The arc-shaped body is hinged to the first exhaust box and / or the second exhaust box. The cover body is provided with a counterweight.

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