Laboratory waste gas filtering and circulating purification device

Abstract

The invention discloses a laboratory waste gas filtering, circulating and purifying device, and belongs to the technical field of wastewater treatment equipment. The device mainly comprises a supporting mechanism suitable for moving, and the supporting mechanism is provided with a bottom frame and a side frame installed on the bottom frame. The gas suction mechanism is mounted on the side frame and is used for sucking waste gas; the pretreatment mechanism is mounted on the side frame, is used for separating solid particles in the waste gas and is provided with a front pipe; the reaction tank is mounted on the bottom frame, a neutralization solution is stored in the reaction tank, and the reaction tank is provided with an input port and an output port which are communicated with the front pipe; activated carbon is stored in the post-treatment mechanism, and the post-treatment mechanism is provided with a rear pipe communicated with the output port; and the drying mechanism is used for drying the waste gas. According to the laboratory waste gas filtering, circulating and purifying device, by arranging the reaction tank with the acid-base solution and the adsorber with the activated carbon, waste gas in a laboratory can be comprehensively treated in a mode of combining activated carbon adsorption and acid-base solution absorption.

Description

Technical Field

[0001] The present application relates to the technical field of wastewater treatment equipment, and specifically to a laboratory waste gas filtering and circulating purification device. Background Art

[0002] The laboratory is a place where experimenters conduct experimental analysis and scientific research activities. Various chemical reagents and medicines are used in the experimental analysis process. These reagents and medicines often volatilize toxic and harmful gases. Various chemical reaction liquids in the experiment process will produce waste gas. The sources of waste gas mainly include volatiles of reagents and samples, intermediates in the reaction process, etc. Its main components are organic waste gas (methane, ether, aldehydes, etc.) and inorganic waste gas (hydrogen chloride, chlorine, ammonia, etc.).

[0003] In recent years, with the increase in the number of experimental studies, laboratory pollution has become increasingly serious, among which the problem of waste gas pollution has attracted more attention. If not handled properly, it will not only affect the working environment and health of the experimenters, but also seriously affect the living air quality of the surrounding residents. Therefore, waste gas treatment devices matching the laboratory came into being;

[0004] For example, patent publication number CN113786678B specifically discloses a laboratory waste gas treatment device. This patent sets a dust removal component before the organic gas generated in the laboratory is absorbed by activated carbon, effectively preventing dust particles from clogging the activated carbon and affecting the absorption effect. At the same time, a desorption mechanism is provided to automatically peel off the dust according to the dust content. At the same time, it cooperates with a heating mechanism to desorb and recycle the activated carbon, effectively saving production costs.

[0005] However, the waste gas generated in the laboratory is of various types and complex composition. Not only organic waste gas but also inorganic waste gas exists. Therefore, it is impossible to completely purify the waste gas by adsorption alone using activated carbon. Therefore, it is necessary to provide a laboratory waste gas filtration and circulation purification device to solve the above problems.

[0006] It should be noted that the above information disclosed in this Background section is only for understanding the background technology of the present application concept, and therefore, it may contain information that does not constitute prior art. Summary of the Invention

[0007] Based on the above problems existing in the prior art, the problem to be solved by this application is: to provide a laboratory waste gas filtration and circulation purification device, which achieves the effect of comprehensive treatment of waste gas in the laboratory through a combination of activated carbon adsorption and acid-base solution absorption.

[0008] The technical solution adopted by the present application to solve its technical problems is: a laboratory waste gas filtering and circulating purification device, comprising a supporting mechanism suitable for movement, the supporting mechanism having a base frame and a side frame installed on the base frame; an air suction mechanism installed on the side frame for absorbing waste gas; a pretreatment mechanism installed on the side frame for separating solid particles in the inhaled waste gas, the pretreatment mechanism having a front pipe for conveying waste gas; a reaction tank installed on the base frame for absorbing inorganic matter in the waste gas and containing a neutralizing liquid, the reaction tank having an input port located at the bottom and connected to the front pipe, and an output port located at the top; a post-treatment mechanism for absorbing organic matter in the waste gas and containing activated carbon, the post-treatment mechanism having a rear pipe connected to the output port; and a drying mechanism for drying the treated waste gas; a drainage hole is provided at the bottom of the reaction tank, a waste liquid tank is provided on one side of the supporting mechanism, a collection pipe is connected between the drainage hole and the waste liquid tank, and a liquid pump is provided on the collection pipe.

[0009] Furthermore, the suction mechanism includes at least two groups of branch pipes fixedly arranged on the supporting mechanism, and multiple groups of branch pipes are provided with manual valves; the multiple groups of branch pipes are divided into two groups, one group of branch pipes is connected to an suction pipe, and the end of the suction pipe away from the branch pipe is connected to a suction cup; one group of branch pipes is connected to a connecting pipe, and the connecting pipe is connected to the exhaust port of the experimental environment.

[0010] Furthermore, the reaction tank is arranged into two groups of smaller tank bodies, and the two groups of tank bodies are suitable for switching.

[0011] Furthermore, the bottoms of the two groups of tank bodies are connected to an air inlet pipe, the other ends of the two groups of air inlet pipes are connected to the front pipe, and an air inlet valve is provided on the air inlet pipe; the tops of the two groups of tank bodies are connected to an air outlet pipe, the other ends of the two groups of air outlet pipes are connected to the rear pipe, and an air outlet valve is provided on the air outlet pipe; the bottoms of the two groups of tank bodies are connected to a liquid outlet pipe, and a three-way valve is provided between the two groups of liquid outlet pipes and the collecting pipe.

[0012] Furthermore, an injection assembly is provided at the upper end of the two groups of tank bodies, and the injection assembly includes an injection tube, and the injection tube is connected to an external liquid storage tank; a rotating tube is rotatably provided at the lower end of the injection tube, and the rotating tube has a liquid outlet, and the upper end of the tank body is connected to a guide tube, and the guide tube is suitable for aligning with the liquid outlet of the rotating tube.

[0013] Furthermore, a pipe sleeve is fixedly provided between the two groups of guide pipes, and the pipe sleeve is located on the outer ring of the rotating tube.

[0014] Furthermore, a first motor is fixedly mounted on the outer side of the injection tube, a first gear is fixedly mounted on the output end of the first motor, a second gear is fixedly mounted on the outer ring of the rotating tube, and the second gear is meshed with the first gear.

[0015] Furthermore, a stirring mechanism is provided on the tank body, and the stirring mechanism includes a second motor fixedly mounted on the upper end of the tank body, a stirring rod is mounted on the output end of the second motor, and a stirring blade is fixedly mounted on the end of the stirring rod.

[0016] Furthermore, a scraper is fitted on the inner wall of the tank body, the scraper is made of magnetic material, and the outer ring of the tank body is provided with a magnetic ring; an electric cylinder is fixedly installed on the output end of the second motor, and the output end of the electric cylinder is connected to the stirring rod; an extension rod is provided on the scraper.

[0017] Furthermore, a corresponding control valve is provided on the flow guide pipe.

[0018] The laboratory waste gas filtration and circulation purification device provided in this application has the following beneficial effects:

[0019] 1. By setting up a reaction tank with acid and alkali solution and an adsorber with activated carbon, the exhaust gas in the laboratory can be comprehensively treated by combining activated carbon adsorption and acid and alkali solution absorption.

[0020] 2. By setting the reaction tank into two groups of tank bodies, the tank body used can be switched and replaced without interrupting the waste gas treatment process, thereby increasing the total amount and efficiency of waste gas treatment in the reaction tank without increasing the volume of the reaction tank.

[0021] 3. By setting up a stirring mechanism, the neutralizing liquid can be stirred during the waste gas treatment process to promote full contact between the waste gas and the neutralizing liquid. At the same time, when the tank body needs to be cleaned, the scraper adsorbed on the inner wall of the tank body is driven by the stirring blade to operate.

[0022] In addition to the above-described purposes, features and advantages, the present application also has other purposes, features and advantages. The present application will be further described in detail below with reference to the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings in the specification, which constitute a part of this application, are used to provide further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute improper limitations on this application.

[0024] In the attached figure:

[0025] Figure 1 This is a 3D modeling diagram of a laboratory exhaust gas filtration and circulation purification device in this application;

[0026] Figure 2 This is an overall diagram of a laboratory waste gas filtration and circulation purification device in this application Figure 1 ;

[0027] Figure 3 This is an overall diagram of a laboratory waste gas filtration and circulation purification device in this application Figure 2 ;

[0028] Figure 4 for Figure 2 Schematic diagram of the local structure at point A;

[0029] Figure 5 for Figure 3 Schematic diagram of the local structure at B in the middle;

[0030] Figure 6 for Figure 3 Schematic diagram of the local structure at point C in the middle;

[0031] Figure 7 for Figure 3 Schematic diagram of the local structure at D in the middle;

[0032] Figure 8 for Figure 2 A schematic diagram of the overall structure of another embodiment of the middle reaction tank;

[0033] Figure 9 for Figure 8 Exploded schematic diagram of the overall structure;

[0034] Figure 10 for Figure 9 Schematic diagram of the local structure at E in the middle;

[0035] Figure 11 for Figure 9 Schematic diagram of the overall structure of the stirring mechanism;

[0036] Figure 12 for Figure 11 Schematic diagram of the local structure at F in the middle;

[0037] Among them, the reference numerals in the figures are:

[0038] 1. Support mechanism; 11. Side frame; 12. Base frame; 13. Handle; 14. Wheel; 15. Screw; 16. Clamp;

[0039] 2. Suction mechanism; 21. Branch pipe; 22. Suction pipe; 23. Suction cup; 231. Suction hole; 24. Connecting pipe; 25. Main pipe; 26. On / off valve;

[0040] 3. Pretreatment mechanism; 31. Main pipe; 32. First dust collector; 33. Second dust collector;

[0041] 4. Reactor; 41. Tank body; 42. Air inlet pipe; 43. Air inlet valve; 44. Air outlet pipe; 45. Air outlet valve; 46. Liquid injection pipe; 47. First motor; 48. First gear; 49. Second gear; 410. Rotating tube; 411. Pipe sleeve; 412. Flow guide pipe; 413. Liquid outlet pipe; 414. Three-way valve; 415. Control valve;

[0042] 5. Post-processing mechanism; 51. Rear pipe; 52. First adsorber; 53. Second adsorber;

[0043] 6. Drying mechanism; 61. Air pump; 62. Drying tube; 63. Drying cylinder; 63. Drying cylinder; 64. Exhaust pipe;

[0044] 7. Collection mechanism; 71. Collection pipe; 72. Waste liquid tank; 73. Liquid pump;

[0045] 8. Stirring mechanism; 81. Second motor; 82. Electric cylinder; 83. Stirring rod; 84. Stirring blade; 85. Scraper; 86. Extension rod. DETAILED DESCRIPTION

[0046] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0047] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0048] Example 1:

[0049] This embodiment mainly describes the basic structure and principle of the laboratory exhaust gas filtration and circulation purification device, specifically:

[0050] like Figure 2 - Figure 3 As shown, the present application provides a laboratory exhaust gas filtering and circulating purification device, including a supporting mechanism 1 for carrying, the supporting mechanism 1 including a base frame 12, the bottom of the base frame 12 is provided with wheels 14, and a side frame 11 is fixedly installed on one side of the base frame 12, and a handle 13 is fixedly provided on the upper end of the side frame 11, so that the staff can use the handle 13 to drive the supporting mechanism 1 to move in the laboratory and reach the position where the exhaust gas needs to be treated;

[0051] At the same time, an air suction mechanism 2 is provided on the side frame 11, which is used to collect the waste gas in the laboratory. It should be noted that the generation of waste gas in the laboratory is relatively complicated. Some waste gas is generated in a closed experimental environment, while some waste gas is not very harmful and is generally generated in an open environment. Therefore, in order to efficiently collect waste gas from different environments, such as Figure 2 and Figure 4 As shown, the air suction mechanism 2 includes at least two groups of pipes 21 fixedly mounted on the side frame 11, and each of the multiple groups of pipes 21 is provided with a manual valve (not shown in the figure) to facilitate manual opening or closing by the staff;

[0052] The multi-component tubes 21 are divided into two groups. One of the group of branch tubes 21 is connected to an air suction pipe 22. The end of the air suction pipe 22 away from the branch tube 21 is connected to a suction cup 23. The suction cup 23 is provided with a suction hole 231 connected to the air suction pipe 22, so that the waste gas dispersed in the laboratory air can be sucked out through the suction hole 231.

[0053] At the same time, another group of branch pipes 21 is connected to a connecting pipe 24, which can be connected to the exhaust port of the closed experimental environment, so that the exhaust gas can be discharged into the branch pipe 21 through the connecting pipe 24;

[0054] A main pipe 25 is fixedly mounted on the side frame 11 . The main pipe 25 serves as a collecting pipe for the multi-component pipes 21 and is connected to all the multi-component pipes 21 , so that the exhaust gas introduced from the branch pipes 21 can enter the main pipe 25 . An on-off valve 26 is provided on the main pipe 25 to control the on-off of the airflow in the main pipe 25 .

[0055] like Figure 2 - Figure 3 and Figure 5 As shown, a pretreatment mechanism 3 is provided on the side frame 11, and the pretreatment mechanism 3 is used for performing preliminary treatment on the exhaust gas to remove solid particles in the exhaust gas. The pretreatment mechanism 3 includes a front pipe 31 connected to the main pipe 25, and a first dust collector 32 and a second dust collector 33 are sequentially provided on the front pipe 31. The first dust collector 32 and the second dust collector 33 are both provided with a filter (not shown in the figure) to filter the solid particles in the exhaust gas. It should be noted that the pore size of the filter in the first dust collector 32 and the second dust collector 33 decreases successively, so that fixed particles of different particle sizes can be intercepted.

[0056] In order to treat inorganic substances in exhaust gas, such as Figure 2 - Figure 3 As shown, a reaction tank 4 is provided on the base frame 12, and a neutralizing liquid is stored in the reaction tank 4. The neutralizing liquid can be provided with a corresponding acid or alkali solution according to the composition of the exhaust gas to neutralize the inorganic substances in the exhaust gas;

[0057] In order to fix the reaction tank 4, a screw 15 is fixedly installed on the side frame 11. One end of the screw 15 is penetrated by a clamping plate 16, so that the reaction tank 4 can be fixed between the side frame 11 and the clamping plate 16 by a nut and kept stable.

[0058] At the same time, an input port (not shown in the figure) is provided at the bottom of the reaction tank 4, which is connected to the front pipe 31, so that the exhaust gas after dust removal can enter the reaction tank 4 through the front pipe 31;

[0059] An output port (not shown) is provided at the top of the reaction tank 4, which is used to discharge the neutralized waste gas for further processing.

[0060] It should be noted that a neutralizing liquid is placed at the bottom of the reaction tank 4 , and the exhaust gas introduced from the front pipe 31 will enter the neutralizing liquid for reaction purification. The purified exhaust gas will escape from the neutralizing liquid and be discharged through the output port at the upper end of the reaction tank 4 .

[0061] In order to discharge the neutralized liquid after the reaction is completed, Figure 2 As shown, a collecting mechanism 7 is provided on one side of the base frame 12, and the collecting mechanism 7 includes a waste liquid tank 72. At the same time, a drainage hole (not shown) is provided at the bottom of the reaction tank 4. A collecting pipe 71 is connected between the drainage hole and the waste liquid tank 72. A liquid pump 73 is provided on the collecting pipe 71 (refer to FIG. Figure 8 ), so that the neutralized liquid after the reaction in the reaction tank 4 can be discharged into the waste liquid tank 72 through the liquid pump 73 for subsequent recycling and treatment.

[0062] like Figure 3 and Figure 6 As shown, an output port (not marked in the figure) is provided at the top of the reaction tank 4, and the output port is connected to a post-processing mechanism 5. The post-processing mechanism 5 includes a rear pipe 51 connected to the output port of the reaction tank 4, and a first adsorber 52 and a second adsorber 53 are provided on the rear pipe 51. The first adsorber 52 and the second adsorber 53 are both provided with activated carbon to absorb organic matter in the exhaust gas.

[0063] In order to dry the gas discharged from the rear pipe 51, Figure 2 and Figure 7 As shown, a drying mechanism 6 is provided in communication with the rear pipe 51. The drying mechanism 6 includes an air pump 61 fixedly mounted on the base frame 12. The input end of the air pump 61 is in communication with the rear pipe 51. A drying pipe 62 is provided in communication with the output end of the air pump 61. Thus, the gas discharged from the rear pipe 51 can enter the drying pipe 62.

[0064] Meanwhile, a drying cylinder 63 is fixedly mounted on the base frame 12. A desiccant (e.g., anhydrous calcium chloride, phosphorus pentoxide, etc.) is disposed in the drying cylinder 63. The drying cylinder 63 is connected to the drying pipe 62, and an exhaust pipe 64 is disposed on the drying cylinder 63. Thus, the gas entering the drying pipe 62 enters the drying cylinder 63 for drying, and the dried gas is discharged through the exhaust pipe 64.

[0065] In summary, when the waste gas in the laboratory needs to be dried, the waste gas is sucked in by the suction mechanism 2, and the solid particles in the waste gas are removed by the pretreatment mechanism 3. The gas is then introduced into the reaction tank 4, and the inorganic matter in the waste gas is removed through the neutralization reaction.

[0066] Finally, the waste gas is discharged from the reaction tank 4, and inorganic substances in the waste gas are removed through the post-processing mechanism 5. After subsequent drying, the purified waste gas is discharged.

[0067] Example 2:

[0068] In the above embodiment, although a neutralizing liquid is placed in the reaction tank 4 to neutralize and absorb inorganic substances in the exhaust gas, when the amount of exhaust gas generated in the laboratory is large, a large amount of neutralizing liquid needs to be placed in the reaction tank 4, which increases the volume of the reaction tank 4 and is inconvenient to use in the laboratory.

[0069] In order to solve the above problems, Figure 8 - Figure 9 As shown, the reaction tank 4 is arranged into two groups of smaller tank bodies 41, so that switching can be performed between the two groups of tank bodies 41 to achieve the purpose of continuously neutralizing the exhaust gas. Specifically:

[0070] The two sets of tank bodies 41 are fixedly mounted on the base frame 12. An air intake pipe 42 is provided at the bottom of each set of tank bodies 41. The other ends of the two sets of air intake pipes 42 are connected to the front pipe 31, so that exhaust gas can be introduced into either set of tank bodies 41 through the air intake pipe 42 as needed. An air intake valve 43 is provided on the air intake pipe 42 to control the on / off of the air intake pipe 42.

[0071] At the same time, an air outlet pipe 44 is provided on the top of each of the two sets of tank bodies 41. The other ends of the two sets of air outlet pipes 44 are connected to the rear pipe 51, so that the exhaust gas can be introduced into the rear pipe 51 through the air outlet pipe 44. At the same time, an air outlet valve 45 is provided on the air outlet pipe 44, and the air outlet valve 45 is used to control the opening and closing of the air outlet pipe 44.

[0072] In addition, a liquid outlet pipe 413 is connected to the bottom of the two groups of tank bodies 41, and a three-way valve 414 is provided between the two groups of liquid outlet pipes 413 and the collection pipe 71, so that the wastewater inside the two groups of tank bodies 41 can be introduced into the collection pipe 71 and then enter the waste liquid tank 72 for collection.

[0073] In order to realize the switching use of the two groups of tanks 41, as shown in FIG. Figure 8 - Figure 10 As shown, a liquid injection assembly is provided at the upper end of the two groups of tank bodies 41, and the liquid injection assembly includes a liquid injection pipe 46, which can be connected to an external liquid storage tank and introduce the neutralizing liquid from the external liquid storage tank into the liquid injection pipe 46;

[0074] A rotating tube 410 is rotatably provided at the lower end of the liquid injection tube 46. The rotating tube 410 has a liquid outlet (not shown). A guide tube 412 is connected to the upper end of the tank body 41. The guide tube 412 is adapted to align with the liquid outlet of the rotating tube 410 and guide the neutralized liquid into the tank body 41.

[0075] It should be noted that when the tank body 41 is switched, the rotating tube 410 is rotated so that the liquid outlet is moved from the position of one set of guide tubes 412 to the position of another set of guide tubes 412, thereby completing the switching of the tank body 41. After the switching is completed, the used tank body 41 is drained, thereby facilitating subsequent use.

[0076] Furthermore, a pipe sleeve 411 is fixedly provided between the two groups of guide pipes 412. The pipe sleeve 411 is located on the outer ring of the rotating tube 410 to prevent leakage of the neutralizing liquid.

[0077] In order to drive the rotating tube 410 to rotate, as shown in FIG. Figure 9 - Figure 10 As shown, a first motor 47 is fixedly mounted on the outside of the liquid injection tube 46, and a first gear 48 is fixedly mounted on the output end of the first motor 47. At the same time, a second gear 49 is fixedly mounted on the outer ring of the rotating tube 410. The second gear 49 meshes with the first gear 48. When the first motor 47 is started, it can drive the rotating tube 410 to rotate, thereby driving the liquid outlet to align with the guide tube 412 at different positions, so as to realize the switching of the tank body 41.

[0078] In this embodiment, corresponding control valves 415 may be provided on the flow guide pipe 412 to achieve switching between the two groups of tanks 41 .

[0079] In order to promote the full contact between the exhaust gas and the neutralizing liquid, such as Figure 9 and Figure 11 As shown, a stirring mechanism 8 is provided on the tank body 41, and the stirring mechanism 8 includes a second motor 81 fixedly mounted on the upper end of the tank body 41, and a stirring rod 83 is mounted on the output end of the second motor 81, and a stirring blade 84 is fixedly mounted on the end of the stirring rod 83, so that the second motor 81 can drive the stirring rod 83 to rotate, and then the stirring blade 84 stirs the neutralization liquid to accelerate the fusion of the exhaust gas and the neutralization liquid;

[0080] During the reaction between the exhaust gas and the neutralizing liquid, impurities are generated and may adhere to the inner wall of the tank 41. If they are not cleaned, when the neutralizing liquid in the tank 41 is switched, the newly replaced neutralizing liquid will be contaminated.

[0081] In order to solve the above problems, Figure 11 - Figure 12 As shown, a scraper 85 is attached to the inner wall of the tank body 41. The scraper 85 is made of magnetic material. A magnet is partially provided on the outer shell of the tank body 41, or a magnetic ring is provided on the outer ring of the tank body 41, so that the scraper 85 can be adsorbed on the inner wall of the tank body 41.

[0082] At the same time, an electric cylinder 82 is fixedly installed at the output end of the second motor 81, and the output end of the electric cylinder 82 is connected to the stirring rod 83, so that the electric cylinder 82 can drive the stirring rod 83 to move in the vertical direction;

[0083] An extension rod 86 is provided on the scraper 85 so that when the neutralization liquid needs to be stirred, the stirring rod 83 can be driven downward by the electric cylinder 82, thereby driving the stirring blade 84 to rotate and stir through the second motor 81;

[0084] When the inner wall of the tank body 41 needs to be cleaned, the electric cylinder 82 retracts. At this time, the stirring blade 84 and the extension rod 86 are at the same height. At this time, the rotation of the stirring blade 84 can drive the scraper 85 to rotate on the inner wall of the tank body 41, thereby cleaning the inner wall of the tank body 41.

[0085] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A laboratory waste gas filtration and circulation purification device, characterized by: include: A support mechanism (1) adapted for movement, the support mechanism (1) comprising a base frame (12) and a side frame (11) mounted on the base frame (12); An air suction mechanism (2) mounted on the side frame (11) for absorbing exhaust gas; A pre-treatment mechanism (3) mounted on the side frame (11) for separating solid particles from the inhaled exhaust gas, the pre-treatment mechanism (3) having a front pipe (31) for conveying the exhaust gas; A reaction tank (4) is mounted on the base frame (12) to absorb inorganic substances in the exhaust gas and contains a neutralizing liquid. The reaction tank (4) has an input port at the bottom and connected to the front pipe (31), and an output port at the top. A post-processing mechanism (5) for absorbing organic matter in the exhaust gas and containing activated carbon, wherein the post-processing mechanism (5) has a rear pipe (51) connected to the output port; and a drying mechanism (6) for drying the treated exhaust gas; The bottom of the reaction tank (4) is provided with a drainage hole, a waste liquid tank (72) is provided on one side of the support mechanism (1), a collection pipe (71) is connected between the drainage hole and the waste liquid tank (72), and a liquid pump (73) is provided on the collection pipe (71).

2. A laboratory waste gas filtration and circulation purification device according to claim 1, characterized in that: The air suction mechanism (2) comprises at least two groups of branch pipes (21) fixedly arranged on the support mechanism (1), and manual valves are arranged on the plurality of groups of branch pipes (21); The plurality of branch pipes (21) are divided into two groups, wherein one group of the branch pipes (21) is connected to an air suction pipe (22), and one end of the air suction pipe (22) away from the branch pipe (21) is connected to a suction cup (23); A group of branch pipes (21) is connected to a connecting pipe (24), and the connecting pipe (24) is connected to the exhaust port of the experimental environment.

3. A laboratory waste gas filtration and circulation purification device according to claim 2, characterized in that: The reaction tank (4) is configured as two groups of smaller tank bodies (41), and the two groups of tank bodies (41) are suitable for switching.

4. The laboratory waste gas filtering and circulating purification device according to claim 3 is characterized in that: The bottoms of the two groups of tank bodies (41) are both connected to each other and are provided with air intake pipes (42). The other ends of the two groups of air intake pipes (42) are both connected to the front pipe (31). An air intake valve (43) is provided on the air intake pipes (42). The tops of the two groups of tank bodies (41) are both connected to each other and are provided with air outlet pipes (44), the other ends of the two groups of air outlet pipes (44) are both connected to the rear pipe (51), and the air outlet pipes (44) are provided with air outlet valves (45); The bottoms of the two groups of tank bodies (41) are both connected with liquid outlet pipes (413), and a three-way valve (414) is provided between the two groups of liquid outlet pipes (413) and the collecting pipe (71).

5. The laboratory waste gas filtering and circulating purification device according to claim 4 is characterized in that: The upper ends of the two groups of tank bodies (41) are provided with a liquid injection assembly, which includes a liquid injection pipe (46), and the liquid injection pipe (46) is communicated with an external liquid storage tank; The lower end of the liquid injection pipe (46) is rotatably provided with a rotating pipe (410), and the rotating pipe (410) has a liquid outlet. The upper end of the tank body (41) is connected to a flow guide pipe (412), and the flow guide pipe (412) is suitable for being aligned with the liquid outlet of the rotating pipe (410).

6. The laboratory waste gas filtering and circulating purification device according to claim 5 is characterized in that: A pipe sleeve (411) is fixedly arranged between the two groups of guide pipes (412), and the pipe sleeve (411) is located on the outer ring of the rotating pipe (410).

7. The laboratory waste gas filtering and circulating purification device according to claim 6, characterized in that: A first motor (47) is fixedly mounted on the outer side of the injection tube (46), a first gear (48) is fixedly mounted on the output end of the first motor (47), a second gear (49) is fixedly mounted on the outer ring of the rotating tube (410), and the second gear (49) is meshed with the first gear (48).

8. The laboratory waste gas filtering and circulating purification device according to claim 7, characterized in that: The tank body (41) is provided with a stirring mechanism (8), the stirring mechanism (8) comprising a second motor (81) fixedly mounted on the upper end of the tank body (41), a stirring rod (83) being mounted on the output end of the second motor (81), and a stirring blade (84) being fixedly mounted on the end of the stirring rod (83).

9. The laboratory waste gas filtering and circulating purification device according to claim 8, characterized in that: The inner wall of the tank body (41) is fitted with a scraper (85), the scraper (85) is made of magnetic material, and the outer ring of the tank body (41) is provided with a magnetic ring; An electric cylinder (82) is fixedly mounted on the output end of the second motor (81), and the output end of the electric cylinder (82) is connected to the stirring rod (83); An extension rod (86) is provided on the scraper (85).

10. The laboratory waste gas filtering and circulating purification device according to claim 6, characterized in that: A corresponding control valve (415) is provided on the flow guide pipe (412).

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