A laboratory air ventilation device for agricultural product testing

Abstract

This invention discloses a laboratory air ventilation device for agricultural product testing, comprising a base with an exhaust duct extending to the outside of the laboratory at its upper end. The base is equipped with a fan, an acid removal chamber, and an alkali removal chamber, which are sequentially connected. Both the acid removal chamber and the alkali removal chamber are equipped with atomizing mechanisms. A reciprocating sliding guide hood is located at the bottom of the activated carbon plate, and jet nozzles corresponding to the activated carbon plate are penetrating through the guide hood. A heating plate is installed inside the acid removal chamber, heating the water to generate steam. The steam is transported to the guide hood through a connecting pipe and sprayed onto the activated carbon plate for desorption treatment. This invention improves acid-base neutralization efficiency and effectively removes acidic and alkaline components from waste gas through multi-stage purification of "acid-base atomization neutralization + activated carbon adsorption and steam desorption." It also enables the recycling of activated carbon, reducing consumable input and the generation of hazardous waste.

Description

Technical Field

[0001] This invention relates to the field of laboratory air ventilation equipment technology, and in particular to a laboratory air ventilation device for agricultural product testing. Background Technology

[0002] When conducting testing on specialty agricultural products from the Yellow River Estuary, such as rice and vegetables grown in saline-alkali soil, it is necessary to complete experiments including nutritional analysis, pesticide residue detection, and quality evaluation. These experiments utilize organic solvents such as acetonitrile, methanol, and n-hexane, generating waste gas containing these solvents and acidic or alkaline substances. This waste gas typically exhibits low concentrations (≤500 mg / m³). 3 The intermittent nature of emissions makes it a major source of air pollution in laboratories.

[0003] To reduce the health impact of such exhaust gases on laboratory personnel, ventilation measures are necessary. Currently used ventilation equipment primarily relies on activated carbon to adsorb organic solvent-based exhaust gases, which has a good adsorption effect, but it has significant limitations: once the activated carbon reaches saturation, it needs to be replaced periodically, generating a large amount of hazardous waste during the replacement process. Therefore, the waste activated carbon requires specialized post-treatment to avoid secondary environmental pollution.

[0004] This ventilation mode, which relies on regularly replacing activated carbon, not only increases the investment in activated carbon consumables and the workload of treating waste activated carbon, but also easily leads to incomplete adsorption because it is impossible to accurately determine the adsorption saturation state of activated carbon, resulting in exhaust gas leakage and emission, and causing environmental pollution problems.

[0005] To address the shortcomings of the existing technology, this application proposes a laboratory air ventilation device for agricultural product testing. Summary of the Invention

[0006] The purpose of this invention is to solve the above-mentioned technical problems by providing a laboratory air ventilation device for agricultural product testing.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A laboratory air ventilation device for agricultural product testing includes a base with an exhaust pipe extending to the outside of the laboratory at its upper end. The base is equipped with a fan, an acid removal chamber, and an alkali removal chamber. The fan, the acid removal chamber, the alkali removal chamber, and the exhaust pipe are connected in sequence. The acid removal chamber and the alkali removal chamber are each equipped with an atomizing mechanism. An activated carbon plate is installed inside the exhaust pipe. A reciprocating sliding guide hood is provided at the bottom of the activated carbon plate. An air jet hole is provided through the guide hood opposite to the activated carbon plate. A heating plate is provided inside the deacidification box. The heating plate heats the water in the deacidification box to generate water vapor. The water vapor is transported to the guide hood through a connecting pipe and sprayed onto the activated carbon plate for desorption treatment.

[0008] Preferably, the blower is installed on the deacidification box, the deacidification box and the alkali removal box are connected by a first pipe, and the alkali removal box and the exhaust pipe are connected by a second pipe, the second pipe being located below the activated carbon plate.

[0009] Preferably, an electric slide rail is installed inside the exhaust pipe, and a sealing plate is provided on the electric slide rail. The sealing plate is used to block the second pipe, and the connecting pipe is installed through the sealing plate.

[0010] Preferably, the atomizing mechanism includes a first movable block movably disposed inside the acid removal box and the alkali removal box. Airbags are installed at both ends of the first movable block. The ends of the airbags are fixedly connected to the inner walls of the acid removal box and the alkali removal box. A suction pipe and a discharge pipe are installed at the bottom of the airbags. An atomizing nozzle is installed at the bottom of the discharge pipe.

[0011] Preferably, a first one-way valve is installed on the liquid outlet tube, which only allows fluid to flow through the airbag into the liquid outlet tube; a second one-way valve is installed on the liquid suction tube, which only allows fluid to enter the airbag through the liquid suction tube.

[0012] Preferably, a motor is installed on the deacidification tank, and a first reciprocating screw is fixed to the output end of the motor. The first reciprocating screw passes through the first moving block and is threadedly connected to it. A first telescopic hose is fixed to both sides of the first moving block. The first telescopic hose is sleeved on the outside of the first reciprocating screw and is fixedly connected to the inner wall of the deacidification tank and the dealkali removal tank. The first reciprocating screws inside the deacidification tank and the dealkali removal tank are connected through a first transmission rod.

[0013] Preferably, a first guide rod is fixed inside the deacidification box and the dealkaliification box, and the first guide rod passes through the first moving block and is slidably connected to it.

[0014] Preferably, a second transmission rod is fixed on the first reciprocating screw inside the alkali removal box. The second transmission rod passes through the exhaust pipe and is rotatably connected to it. A second reciprocating screw is fixed on the second transmission rod. A second moving block is threadedly connected to the outside of the second reciprocating screw. A second guide rod is fixed inside the exhaust pipe. The second guide rod passes through the second moving block and is slidably connected to it. The second moving block is fixedly connected to the bottom of the guide shroud.

[0015] Preferably, a second telescopic hose is fixed on both sides of the second movable block, the second telescopic hose is sleeved on the outside of the second reciprocating screw, and the other end of the second telescopic hose is fixedly connected to the inner wall of the exhaust pipe.

[0016] Preferably, a condenser pipe is installed inside the exhaust pipe, and a collection box is provided below the condenser pipe, the collection box being installed through the exhaust pipe.

[0017] Compared with the prior art, the beneficial effects of this invention are as follows: 1. By adopting a multi-stage purification structure of "acid-base atomization neutralization + activated carbon adsorption + water vapor desorption", many shortcomings of existing equipment are solved: First, the atomization mechanism enables full contact between the acid and alkali treatment liquid and the waste gas, improves the acid-base neutralization efficiency, effectively removes acidic and alkaline components in the waste gas, and lays the foundation for subsequent activated carbon adsorption.

[0018] 2. An activated carbon plate reciprocating desorption mechanism is set up to desorb the activated carbon using water vapor, so as to realize the recycling of activated carbon without the need for regular replacement, reduce the investment in activated carbon consumables, and avoid the hazardous waste and secondary pollution generated by discarded activated carbon.

[0019] 3. The synchronous linkage between the atomizing mechanism and the guide shroud is achieved by motor drive, which simplifies the equipment structure, reduces energy consumption, and prevents exhaust gas leakage by sealing the pipeline through the sealing plate during the desorption process; the organic solvent after desorption is recovered through the condenser and the collection box, realizing the centralized treatment of pollutants and further reducing the risk of environmental pollution.

[0020] In summary, this invention improves acid-base neutralization efficiency and effectively removes acidic and alkaline components from waste gas through multi-stage purification of "acid-base atomization neutralization + activated carbon adsorption + water vapor desorption"; it also enables the recycling of activated carbon, reducing consumable input and the generation of hazardous waste. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a laboratory air ventilation device for agricultural product testing proposed in this invention; Figure 2 This is a perspective view of a laboratory air ventilation device for agricultural product testing proposed in this invention; Figure 3 This is a side view of a laboratory air ventilation device for agricultural product testing proposed in this invention; Figure 4 This is a cross-sectional view of a laboratory air ventilation device for agricultural product testing proposed in this invention; Figure 5 This is a schematic diagram of the air bladder structure in a laboratory air ventilation device for agricultural product testing proposed in this invention; Figure 6 This is a schematic diagram of the structure of the first reciprocating lead screw in a laboratory air ventilation device for agricultural product testing proposed in this invention; Figure 7 This is a schematic diagram of the air guide hood in a laboratory air ventilation device for agricultural product testing proposed in this invention; Figure 8This is a schematic diagram of the structure of the second reciprocating lead screw in a laboratory air ventilation device for agricultural product testing proposed in this invention.

[0022] In the diagram: 1. Base, 2. Exhaust duct, 3. Fan, 4. Motor, 5. Acid removal box, 6. First transmission rod, 7. First pipe, 8. Alkali removal box, 9. Second transmission rod, 10. Second pipe, 11. Heating plate, 12. Container box, 13. Condenser pipe, 14. Sealing plate, 15. Connecting pipe, 16. First guide rod, 17. First telescopic hose, 18. Airbag, 19. Activated carbon plate, 20. First moving block, 21. First reciprocating screw, 22. Atomizing nozzle, 23. Liquid outlet pipe, 24. Liquid suction pipe, 25. First one-way valve, 26. Second one-way valve, 27. Flow guide hood, 28. Jet nozzle, 29. Second guide rod, 30. Second telescopic hose, 31. Second reciprocating screw, 32. Second moving block, 33. Electric slide rail. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0024] Reference Figures 1-8 A laboratory air ventilation device for agricultural product testing includes a base 1, which serves as the overall support structure and is made of corrosion-resistant hard alloy material to ensure the stability of the equipment during operation and adapt to the complex working environment of the laboratory. An exhaust duct 2 extending to the outside of the laboratory is fixedly installed at the upper end of the base 1. The exhaust duct 2 adopts a sealed pipe structure with an anti-corrosion coating on the inner wall to prevent long-term erosion by exhaust gases from causing pipe damage and leakage. Its top extends to an open outdoor area to ensure that the purified gas meets emission standards.

[0025] The base 1 is equipped with a fan 3, an acid removal box 5, and an alkali removal box 8 in sequence. The four are connected in sequence through pipes to form a complete waste gas transportation and purification channel: the fan 3 is fixedly installed on the top of the acid removal box 5, and the air inlet of the fan 3 is connected to the inside of the laboratory to draw out the waste gas inside the laboratory and provide power for the flow of waste gas; the acid removal box 5 and the alkali removal box 8 are sealed and connected through the first pipe 7 to transport the waste gas after acid removal treatment to the alkali removal box 8 for secondary purification; the alkali removal box 8 and the exhaust pipe 2 are sealed and connected through the second pipe 10, and the outlet end of the second pipe 10 is located below the activated carbon plate 19 inside the exhaust pipe 2 to ensure that the waste gas after acid and alkali treatment is first adsorbed by activated carbon before being discharged outdoors.

[0026] Both the acid removal tank 5 and the alkali removal tank 8 are equipped with atomizing mechanisms to atomize the acid and alkali treatment solutions, increasing the contact area between the treatment solutions and the waste gas, and improving the acid-alkali neutralization efficiency. Simultaneously, a heating plate 11 is fixedly installed inside the acid removal tank 5. The heating plate 11 uses electric heating and is positioned against the bottom of the acid removal tank 5 to heat the water inside, generating steam for subsequent desorption treatment by the activated carbon plate 19.

[0027] The atomizing mechanism specifically includes a first movable block 20 movably disposed inside the acid removal tank 5 and the alkali removal tank 8. Airbags 18 are fixedly connected to both ends of the first movable block 20. The ends of the airbags 18 are sealed and fixed to the inner walls of the corresponding acid removal tank 5 and alkali removal tank 8. The airbags 18 can extend and retract as the first movable block 20 moves. A suction pipe 24 and an outlet pipe 23 are fixedly connected to the bottom of the airbags 18. The bottom end of the suction pipe 24 extends to the bottom of the acid removal tank 5 and the alkali removal tank 8, used to extract the treatment liquid inside the tanks (the acid removal tank contains alkaline treatment liquid, and the alkali removal tank contains acidic treatment liquid). An atomizing nozzle 22 is fixedly installed at the bottom of the outlet pipe 23. The atomizing nozzle 22 can atomize the treatment liquid into fine droplets, which are evenly sprayed into the exhaust gas to improve the neutralization effect.

[0028] To prevent backflow of the treatment fluid and ensure stable operation of the atomizing mechanism, a first one-way valve 25 is installed on the outlet pipe 23. The first one-way valve 25 only allows fluid to flow from the air bladder 18 to the outlet pipe 23. A second one-way valve 26 is installed on the suction pipe 24. The second one-way valve 26 only allows fluid to enter the air bladder 18 from the suction pipe 24. Through the cooperation of the two one-way valves, the one-way delivery of the treatment fluid is realized, ensuring the continuity of the atomization process.

[0029] A motor 4 is fixedly installed at the top of the deacidification tank 5. The motor 4 serves as a power source, and its output end is fixedly connected to a first reciprocating screw 21. The first reciprocating screw 21 passes through the first moving block 20 and is threadedly connected to it. A first guide rod 16 is fixed inside both the deacidification tank 5 and the dealkali removal tank 8. The first guide rod 16 passes through the first moving block 20 and is slidably connected to it. The first guide rod 16 is used to limit the movement trajectory of the first moving block 20, prevent it from rotating synchronously with the first reciprocating screw 21, and ensure that the first moving block 20 moves back and forth in a straight line.

[0030] Both sides of the first movable block 20 are fixedly connected with a first telescopic hose 17. The first telescopic hose 17 is sleeved on the outside of the first reciprocating screw 21, and both ends of the first telescopic hose 17 are sealed and fixed to the inner walls of the acid removal tank 5 and the alkali removal tank 8, respectively, to seal and protect the first reciprocating screw 21, preventing the treatment liquid from corroding the screw and preventing exhaust gas from contacting the screw and causing damage. In addition, the first reciprocating screw 21 in the acid removal tank 5 and the alkali removal tank 8 are connected by a first transmission rod 6, so that after the motor 4 starts, it can drive the two first reciprocating screws 21 to rotate synchronously through the first transmission rod 6, realizing the synchronous operation of the atomizing mechanism in the two tanks and improving the exhaust gas treatment efficiency.

[0031] Acid-base purification process: Start motor 4 and fan 3. Fan 3 extracts laboratory waste gas and delivers it to the deacidification tank 5. Motor 4 drives the first reciprocating screw 21 to rotate, driving the first moving block 20 to slide back and forth along the first guide rod 16. When the first moving block 20 moves away from the airbag 18, the airbag 18 is stretched, the internal air pressure decreases, the second one-way valve 26 opens, and the suction pipe 24 draws the treatment liquid in the tank into the airbag 18. When the first moving block 20 moves closer to the airbag 18... When the airbag 18 moves in the direction of the airbag, the internal air pressure increases, the first one-way valve 25 opens, and the treatment liquid in the airbag 18 is transported to the atomizing nozzle 22 through the liquid outlet pipe 23. After atomization, it comes into full contact with the exhaust gas. Since the two airbags 18 are compressed alternately, the atomizing nozzle 22 can continuously spray atomized acid and alkali liquid. The alkaline treatment liquid in the acid removal tank 5 neutralizes the acid components in the exhaust gas, and the acid treatment liquid in the alkali removal tank 8 neutralizes the alkaline components in the exhaust gas, thus completing the acid and alkali pretreatment of the exhaust gas.

[0032] An activated carbon plate 19 is fixedly installed inside the exhaust duct 2. The activated carbon plate 19 is made of coal-based columnar activated carbon (particle size 4-8mm) or coconut shell activated carbon (specific surface area ≥1000m²). 2 / g), coconut shell activated carbon has higher adsorption efficiency and is more suitable for low-concentration VOCs. It can be used to adsorb organic solvent components in waste gas after acid and alkali pretreatment, further improving the waste gas purification effect.

[0033] The exhaust pipe 2 is equipped with a guide hood 27 located below the activated carbon plate 19 and capable of reciprocating sliding. The top of the guide hood 27 is attached to the bottom of the activated carbon plate 19. The guide hood 27 is provided with jet holes 28 corresponding to the activated carbon plate 19. The jet holes 28 are evenly distributed on the guide hood 27, which can evenly spray water vapor onto the surface of the activated carbon plate 19 to achieve complete desorption of activated carbon.

[0034] An electric slide rail 33 is installed inside the exhaust pipe 2. A sealing plate 14 is slidably connected to the electric slide rail 33. The sealing plate 14 is sealed and fitted to the inner wall of the exhaust pipe 2 to block the outlet end of the second pipe 10. One end of the connecting pipe 15 is installed through the sealing plate 14, so water vapor can only be discharged through the connecting pipe 15. The temperature of the water vapor is in the range of 100-120℃.

[0035] The other end of the connecting pipe 15 extends into the guide shroud 27 to transport the water vapor generated by heating in the deacidification box 5 to the guide shroud 27. The connecting pipe 15 is a high-temperature resistant sealed pipe to prevent water vapor leakage.

[0036] To achieve the reciprocating sliding of the flow guide shroud 27, a second transmission rod 9 is fixedly connected to the first reciprocating lead screw 21 inside the alkali removal box 8. The second transmission rod 9 passes through the exhaust pipe 2 and is rotatably connected to it. A second reciprocating lead screw 31 is fixedly connected to one end of the second transmission rod 9 inside the exhaust pipe 2. A second moving block 32 is threadedly connected to the outside of the second reciprocating lead screw 31. A second guide rod 29 is fixed inside the exhaust pipe 2. The second guide rod 29 passes through the second moving block 32 and is slidably connected to it to limit the movement trajectory of the second moving block 32. The top of the second moving block 32 is fixedly connected to the bottom of the flow guide shroud 27, so that the flow guide shroud 27 reciprocates synchronously with the second moving block 32.

[0037] The second movable block 32 is fixedly connected to both sides of the second telescopic hose 30. The second telescopic hose 30 is sleeved on the outside of the second reciprocating screw 31, and the other end of the second telescopic hose 30 is sealed and fixed to the inner wall of the exhaust pipe 2. This is used to seal and protect the second reciprocating screw 31 and the second movable block 32, so as to prevent the organic solvents adsorbed by activated carbon or the desorbed waste gas from corroding the parts and ensure the stable operation of the mechanism.

[0038] Inside the exhaust pipe 2, above the activated carbon plate 19, a condenser pipe 13 is installed. The condenser pipe 13 has a serpentine structure to increase the condensation area. Below the condenser pipe 13, there is a collection box 12. The collection box 12 runs through the exhaust pipe 2 and the connection between the collection box 12 and the exhaust pipe 2 is sealed. It is used to collect the liquid organic solvents condensed by the condenser pipe 13, which facilitates subsequent centralized treatment and avoids direct discharge of organic solvents that may cause environmental pollution.

[0039] After the laboratory is completed, the activated carbon adsorption and desorption process is as follows: The waste gas after acid and alkali pretreatment enters the exhaust pipe 2 through the second pipe 10. When it passes through the activated carbon plate 19, the organic solvent components in the waste gas are adsorbed by the activated carbon plate 19, and the purified gas is discharged outdoors through the exhaust pipe 2. When the activated carbon plate 19 has adsorbed for a certain period of time, the electric slide rail 33 is activated to move the sealing plate 14 to the outlet end of the second pipe 10 to block it and prevent the waste gas from entering the exhaust pipe 2. Then the heating plate 11 is activated to heat the water in the acid removal box 5. The generated water vapor flows through the first pipe 7 to the alkali removal box 8. The water vapor in the alkali removal box 8 flows to the second pipe 10 and is then transported to the guide hood 27 through the connecting pipe 15. Simultaneously, the second transmission rod 9 rotates synchronously with the first reciprocating screw 21, driving the second reciprocating screw 31 to rotate, driving the second moving block 32 to slide back and forth along the second guide rod 29, thereby driving the guide shroud 27 to move back and forth. The jet hole 28 sprays water vapor evenly onto the entire surface of the activated carbon plate 19. Heat passes through the activated carbon plate 19, completely desorbing it. The desorbed organic solvent flows upward with the water vapor, and when it passes through the condenser tube 13, it is condensed into liquid and drips into the collection box 12 below. After desorption is completed, the heating plate 11 is turned off. After the condenser tube 13 cools down, the electric slide rail 33 is activated, driving the sealing plate 14 to reset, releasing the blockage of the second pipe 10. The activated carbon plate 19 resumes adsorption work. It can be recycled without replacing the activated carbon. Generally, the activated carbon can be regenerated 3-5 times, after which it needs to be replaced entirely.

[0040] When using this invention, the process of purifying exhaust gas is as follows: First, start motor 4 and fan 3. Fan 3 draws out laboratory waste gas and delivers it to deacidification box 5. Then, start motor 4. The output of motor 4 drives the first reciprocating screw 21 to rotate, driving the first moving block 20 to slide back and forth along the first guide rod 16. When the first moving block 20 moves away from the airbag 18 (left side), the left airbag 18 is stretched, the internal air pressure decreases, the second one-way valve 26 opens, and the suction pipe 24 draws the treatment liquid in the box into the airbag 18. At this time, when the first moving block 20 moves closer to the right airbag 18, the airbag 18 is compressed, the internal air pressure increases, the first one-way valve 25 opens, and the treatment liquid in the airbag 18 is delivered to the atomizing nozzle 22 through the right outlet pipe 23. After atomization, it fully contacts the waste gas. When the first moving block 20 moves to the right, the left airbag 18 is compressed, and the right airbag 18 is stretched. At this time, the left atomizing nozzle 22 sprays out atomized liquid. As the two airbags 18 are alternately compressed, the atomizing nozzle 22 continuously sprays atomized acid and alkali solutions; the alkaline treatment solution in the acid removal tank 5 neutralizes the acidic components in the waste gas, and the acidic treatment solution in the alkali removal tank 8 neutralizes the alkaline components in the waste gas. As described above, the acidic atomized solution is sprayed out to complete the acid and alkali pretreatment of the waste gas.

[0041] The waste gas residue after acid and alkaline treatment is organic solvent. The organic solvent flows into the exhaust pipe 2 through the second pipe 10. When it passes through the activated carbon plate 19, the organic solvent components in the waste gas are adsorbed by the activated carbon plate 19. The purified gas is discharged outdoors through the exhaust pipe 2, so as not to cause pollution to the environment.

[0042] After laboratory use, before desorption, first drain the residual liquid in the tank, then inject deionized water to rinse the inner walls of the acid removal tank 5 and the alkali removal tank 8 twice, and use a high-pressure air nozzle to blow out the dead corners of the tank. Finally, drain the tank again and inject new deionized water for steam generation to thoroughly remove the acid and alkali substances adsorbed on the inner walls and ensure that the water vapor is neutral and pure. Then, start the electric slide rail 33 to move the sealing plate 14 to the outlet end of the second pipe 10 to seal it and prevent waste gas from entering the exhaust pipe 2. Then, start the heating plate 11 to heat the clean water in the acid removal tank 5. The generated water vapor flows through the first pipe 7 into the alkali removal tank 8. As the water vapor in the alkali removal tank 8 increases, it flows to the second pipe 10 and is then transported to the guide hood 27 through the connecting pipe 15. At the same time, the second reciprocating screw 31 is driven to rotate, driving the second moving block 32 to slide back and forth along the second guide rod 29, thereby driving the guide hood 27 to move back and forth. The jet nozzle 28 sprays water vapor evenly onto the entire surface of the activated carbon plate 19. Heat passes through the activated carbon plate 19, causing complete desorption of the activated carbon plate 19.

[0043] The exhaust duct 2 is equipped with an organic solvent concentration monitoring module and a nitrogen supply device for real-time monitoring of organic solvent concentration. When the fan 4 is running at low power during the desorption stage, the system will simultaneously activate the real-time monitoring of organic solvent concentration. During the desorption stage, when the organic solvent concentration monitoring module detects that the concentration of organic vapor reaches 25% of the lower explosive limit, the fan volume will be automatically reduced to 10% of the purification stage, and the gas supply valve will be opened simultaneously to introduce nitrogen to dilute the vapor concentration and fundamentally avoid the risk of explosion.

[0044] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A laboratory air ventilation device for agricultural product testing, comprising a base (1) with an exhaust duct (2) extending to the outside of the laboratory at its upper end, characterized in that, The base (1) is equipped with a fan (3), an acid removal box (5), and an alkali removal box (8). The fan (3), the acid removal box (5), the alkali removal box (8), and the exhaust pipe (2) are connected in sequence. The acid removal box (5) and the alkali removal box (8) are both equipped with an atomizing mechanism. The exhaust pipe (2) is equipped with an activated carbon plate (19). The bottom of the activated carbon plate (19) is equipped with a reciprocating sliding guide hood (27). The guide hood (27) is provided with a jet hole (28) opposite to the activated carbon plate (19). The deacidification box (5) is equipped with a heating plate (11). The heating plate (11) heats the water in the deacidification box (5) to generate water vapor. The water vapor is transported to the guide hood (27) through the connecting pipe (15) and sprayed onto the activated carbon plate (19) for desorption treatment.

2. The laboratory air ventilation equipment for agricultural product testing according to claim 1, characterized in that, The blower (3) is installed on the deacidification box (5). The deacidification box (5) and the alkali removal box (8) are connected by the first pipe (7). The alkali removal box (8) and the exhaust pipe (2) are connected by the second pipe (10). The second pipe (10) is located below the activated carbon plate (19).

3. The laboratory air ventilation equipment for agricultural product testing according to claim 1, characterized in that, An electric slide rail (33) is installed inside the exhaust pipe (2). A sealing plate (14) is provided on the electric slide rail (33). The sealing plate (14) is used to block the second pipe (10). The connecting pipe (15) is installed through the sealing plate (14).

4. The laboratory air ventilation equipment for agricultural product testing according to claim 1, characterized in that, The atomizing mechanism includes a first movable block (20) movably disposed inside the deacidification box (5) and the dealkali removal box (8). Both ends of the first movable block (20) are equipped with airbags (18). The ends of the airbags (18) are fixedly connected to the inner walls of the deacidification box (5) and the dealkali removal box (8). The bottom of the airbags (18) is equipped with a suction pipe (24) and a discharge pipe (23). The bottom of the discharge pipe (23) is equipped with an atomizing nozzle (22).

5. A laboratory air ventilation device for agricultural product testing according to claim 4, characterized in that, The discharge tube (23) is equipped with a first one-way valve (25), which allows fluid to flow through the airbag (18) into the discharge tube (23); the suction tube (24) is equipped with a second one-way valve (26), which allows fluid to enter the airbag (18) through the suction tube (24).

6. The laboratory air ventilation equipment for agricultural product testing according to claim 5, characterized in that, A motor (4) is installed on the deacidification box (5). A first reciprocating screw (21) is fixed at the output end of the motor (4). The first reciprocating screw (21) passes through the first moving block (20) and is threadedly connected to it. A first telescopic hose (17) is fixed on both sides of the first moving block (20). The first telescopic hose (17) is sleeved on the outside of the first reciprocating screw (21). The first telescopic hose (17) is fixedly connected to the inner wall of the deacidification box (5) and the alkali removal box (8). The first reciprocating screw (21) inside the deacidification box (5) and the alkali removal box (8) is connected to each other through the first transmission rod (6).

7. A laboratory air ventilation device for agricultural product testing according to claim 6, characterized in that, The deacidification box (5) and the dealkali removal box (8) are fixed with a first guide rod (16), which passes through the first moving block (20) and is slidably connected to it.

8. A laboratory air ventilation device for agricultural product testing according to claim 7, characterized in that, A second transmission rod (9) is fixed on the first reciprocating screw (21) inside the alkali removal box (8). The second transmission rod (9) passes through the exhaust pipe (2) and is rotatably connected to it. A second reciprocating screw (31) is fixed on the second transmission rod (9). A second moving block (32) is threadedly connected to the outside of the second reciprocating screw (31). A second guide rod (29) is fixed inside the exhaust pipe (2). The second guide rod (29) passes through the second moving block (32) and is slidably connected to it. The second moving block (32) is fixedly connected to the bottom of the guide shroud (27).

9. A laboratory air ventilation device for agricultural product testing according to claim 8, characterized in that, The second movable block (32) has a second telescopic hose (30) fixed on both sides. The second telescopic hose (30) is sleeved on the outside of the second reciprocating screw (31). The other end of the second telescopic hose (30) is fixedly connected to the inner wall of the exhaust pipe (2).

10. A laboratory air ventilation device for agricultural product testing according to claim 1, characterized in that, The exhaust pipe (2) is equipped with a condenser pipe (13), and a receiving box (12) is provided below the condenser pipe (13). The receiving box (12) is installed through the exhaust pipe (2).

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