VOCs treatment equipment and method based on room temperature ozone catalytic oxidation and micro-nano bubbles

Abstract

The present invention relates to a VOCs treatment device and method based on room-temperature ozone catalytic oxidation and micro-nano bubbles. The device comprises a pretreatment zone, a catalytic reaction zone and a deep purification zone which are sequentially connected. The pretreatment zone is provided for removing more than 99% of particulate matter in VOCs waste gas by a large-volume cyclone dust collector. At the same time, ozone generated by a first ozone decomposition module is fully mixed with the VOCs waste gas to decompose the VOCs waste gas. The catalytic reaction is then provided to deeply oxidize and decompose VOCs at room temperature, and to decompose cyclic compounds by ring-opening oxidation. The deep purification zone is then provided for convection and uniform mixing of the VOCs waste gas and the sprayed micro-nano bubble solution from bottom to top. At the same time, the rupture of the micro-nano bubbles locally generates a high-temperature, high-pressure subcritical state and produces a large number of active oxygen free radicals, thereby enhancing the degradation ability of the spraying process. Compared with existing commonly used technologies, the present invention has lower operating costs and energy consumption and stronger operating stability.

Description

Technical Field

[0001] The present invention relates to the technical field of environmentally friendly organic waste gas treatment, and in particular to a VOCs treatment device and method based on room-temperature ozone catalytic oxidation and micro-nano bubbles. Background Art

[0002] VOCs are a general term for volatile organic compounds (VOCs) with a melting point below room temperature and a boiling point between 50°C and 260°C. They are often important precursors to photochemical smog and haze, which not only impact the ecological environment but also pose serious risks to human health. A major source of VOCs is industrial production processes such as coal chemical industry, petrochemical industry, fuel manufacturing, and solvent production. Most VOC-containing exhaust gases have high air volumes and low concentrations, making direct incineration a significant energy drain.

[0003] End-of-pipe treatment methods for VOCs primarily include physical collection and chemical destruction. Collection methods include activated carbon adsorption and zeolite wheel adsorption and concentration. For example, patent CN 114917719, titled "A VOCs Removal Device for VOCs Waste Gas Treatment Technology," is an improvement to the activated carbon adsorption device. Patent CN 112546811, titled "A VOCs Adsorption Concentration Purification System and VOCs Adsorption Concentration Purification Method," proposes a zeolite wheel-based adsorption and concentration method for improving the economic benefits of VOC treatment. In addition to incineration, chemical destruction methods also include photocatalytic oxidation and low-temperature plasma. For example, patent number CN 102423611, entitled "Method for removing VOCs by ultraviolet photocatalytic oxidation and coordinated biofiltration," combines photocatalytic oxidation with biofiltration, and patent number CN113019083, entitled "VOCs low-temperature plasma coordinated adsorption catalysis integrated device and method for treating VOCs," proposes integrating a plasma generator and a catalyst.

[0004] Among the above methods, activated carbon adsorption and zeolite wheel adsorption concentration methods often need to be used in conjunction with thermal storage combustion, which results in high construction costs and subsequent operating costs; while photocatalytic oxidation and low-temperature plasma methods are prone to catalyst poisoning, resulting in reduced effectiveness, and ozone cannot be removed in time, resulting in secondary pollution. Therefore, the current VOCs control methods still have room for improvement. Summary of the Invention

[0005] The present invention aims to solve at least one of the problems existing in the existing related technologies to a certain extent. To this end, the present invention proposes a VOCs treatment device and method based on room temperature ozone catalytic oxidation and micro-nano bubbles.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The VOCs treatment equipment based on room temperature ozone catalytic oxidation and micro-nano bubbles includes a pretreatment zone, a catalytic reaction zone and a deep purification zone which are connected in sequence, wherein:

[0008] The pretreatment area includes a large air volume cyclone dust collector and a first ozone decomposition module;

[0009] The catalytic reaction zone includes an ozone catalytic oxidation reactor and a second ozone decomposition module. The ozone catalytic oxidation reactor includes a tank body and a first catalyst filler, a first ozone generator, and a first aeration disk arranged in the tank body. An opening and an automatic replacement mechanism are provided on the outer wall of the tank body. A sealing plate is sealed in the opening. The first catalyst filler is detachably arranged on the inner side of the sealing plate. The automatic replacement mechanism can open the sealing plate and replace the first catalyst filler.

[0010] The deep purification area includes a micro-nano bubble spray module, which includes a spray tower, a second ozone generator, a second aeration disk and a micro-nano bubble generator. A spray head is provided on the upper inner portion of the spray tower, and a liquid storage chamber containing an alkaline solution is provided below. The second aeration disk is provided in the liquid storage chamber and is connected to the second ozone generator through a pipe. The spray head is connected to the liquid storage chamber through a circulation pipe. The micro-nano bubble generator is provided on the circulation pipe and is provided with a circulation water pump.

[0011] In some embodiments, two openings are symmetrically provided, so that two sealing plates are correspondingly provided, and the first catalyst filler is composed of two symmetrical semi-arc catalyst filler pieces, and the two semi-arc catalyst filler pieces are correspondingly provided on two sealing plates.

[0012] In some embodiments, the automatic replacement mechanism includes a longitudinal guide assembly arranged between the semi-arc catalyst filler and the sealing plate, and a guide limit assembly is arranged on the longitudinal guide assembly, and the guide limit assembly can limit the semi-arc catalyst filler to prevent it from falling down. Transverse guide rails are arranged on both sides of the opening on the tank body, and sliding members are arranged on both sides of the sealing plate. The sliding members are slidably arranged in the transverse guide rails. It also includes a first power mechanism and a second power mechanism. The first power mechanism can move the two sealing plates relative to each other and enable the sealing plates to be in an open state and then a closed state. A preparation area for placing the semi-arc catalyst filler to be replaced is provided on the lower side of the opening. When the sealing plate is in an open state, the semi-arc catalyst filler in the preparation area is arranged corresponding to the semi-arc catalyst filler on the sealing plate. The second power mechanism can push the semi-arc catalyst filler in the preparation area upward, so that the semi-arc catalyst filler in the preparation area is moved to the sealing plate.

[0013] In some embodiments, the longitudinal guide assembly includes a first dovetail key disposed on the inner side of the sealing plate, and the semi-arc-shaped catalyst filler is provided with a dovetail groove that cooperates with the first dovetail key.

[0014] In some embodiments, the guide limit assembly includes a groove arranged on the outside of the first dovetail key, and a spring and a limit block are arranged in the groove. The limit block can limit the semi-arc catalyst filler from falling downward, and the lower side of the outer end of the limit block is a slope structure.

[0015] In some embodiments, the first power mechanism includes a motor provided on the tank body and located between the two openings, a gear is provided on the output shaft of the motor, a first rack is provided on one of the sealing plates, and a second rack is provided on the other sealing plate, the first rack and the second rack are rotationally symmetrically arranged and can both engage with the gear.

[0016] In some embodiments, a second dovetail key is provided on the preparation area, and an arc-shaped limit strip is provided on the outside of the opening. When the sealing plate is in an open state, the sealing plate rests on the arc-shaped limit strip, and the first dovetail key and the second dovetail key are provided correspondingly.

[0017] In some embodiments, the second power mechanism includes a hydraulic cylinder disposed below the preparation area, and a support plate for pushing the semi-arc-shaped catalyst filler is disposed on the piston rod of the hydraulic cylinder.

[0018] In some embodiments, the first ozone decomposition module is arranged on the first delivery pipeline between the pretreatment zone and the catalytic reaction zone, and the second ozone decomposition module is arranged on the second delivery pipeline between the catalytic reaction zone and the deep purification zone. The first ozone decomposition module and the second ozone decomposition module are both ultraviolet lamps.

[0019] The present invention also provides a VOCs treatment method based on room-temperature ozone catalytic oxidation and micro-nano bubbles, comprising the following steps:

[0020] S1. Preprocessing:

[0021] The particulate matter in the VOCs waste gas is separated from the air flow by a large air volume cyclone dust collector. The VOCs waste gas after the particulate matter is separated is mixed with the first ozone decomposition module, and the VOCs waste gas is decomposed in the first conveying pipeline;

[0022] S2. Catalytic reaction:

[0023] Ozone is generated by the first ozone generator and enters the tank through the first aeration plate, then passes through the first catalyst filler, and is finally mixed with the second ozone decomposition module, allowing the VOCs waste gas to be decomposed again in the second transmission pipeline;

[0024] S3, deep purification:

[0025] Ozone is generated by the second ozone generator and enters the spray tower through the second aeration plate and mixes with the alkaline solution in the liquid storage chamber. The alkaline liquid dissolved in ozone enters the micro-nano bubble generator through the circulation pipe and generates micro-nano bubbles, forming a liquid dissolved in ozone and micro-nano bubbles, which is then sprayed out through the spray head.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. The present invention achieves efficient degradation of VOCs at room temperature. Compared with existing common technologies, including physical adsorption, photocatalytic degradation, and plasma methods, it has lower operating costs and energy consumption and stronger operating stability.

[0028] 2. A pre-treatment area is set up, which removes more than 99% of particulate matter in the VOCs exhaust gas through a large air volume cyclone dust collector. At the same time, the ozone generated by the first ozone decomposition module is fully mixed with the VOCs exhaust gas to decompose the VOCs exhaust gas. The pre-treatment area also plays a certain buffering role, allowing it to enter the next process stably.

[0029] 3. Through the setting of catalytic reaction, VOCs can be deeply oxidized and decomposed at room temperature, and cyclic compounds can also be ring-opened and oxidized;

[0030] 4. A deep purification zone is set up at the end, through which the VOCs exhaust gas and the sprayed micro-nano bubble solution convect from bottom to top and mix evenly; the micro-nano bubbles have a high mass transfer efficiency due to their small particle size and large specific surface area. On the other hand, the pressure inside them is higher than normal pressure, which has a solubilizing effect on the remaining VOCs and ozone in the exhaust gas; at the same time, the rupture of the micro-nano bubbles will produce a high-temperature, high-pressure subcritical state locally, and generate more active oxygen free radicals, which enhances the degradation ability of the spraying process.

[0031] 5. By using the method and equipment of the present invention in multiple stages, the degradation rate of VOCs in large-volume exhaust gas can be greatly improved, and the removal rate of difficult-to-degrade triphenyl pollutants can also be greatly improved;

[0032] 6. In addition, the first catalyst filler is detachable and can be automatically disassembled and replaced by an automatic replacement mechanism, which has high disassembly and installation efficiency, reduces manual labor intensity, and ensures the normal operation of the first catalyst filler. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the main structure of the device of the present invention;

[0034] Figure 2Schematic diagram of the structure of the ozone catalytic oxidation reactor of the present invention;

[0035] Figure 3 This is a schematic structural diagram of the micro-nano bubble spray module of the present invention;

[0036] Figure 4 This is a schematic structural diagram of the sealing plate of the present invention when it is in a closed state;

[0037] Figure 5 This is a schematic diagram of the three-dimensional structure of the sealing plate of the present invention when it is in an open state;

[0038] Figure 6 This is a side view of the structure of the sealing plate of the present invention when it is in an open state;

[0039] Figure 7 This is a schematic diagram of the combination of two semi-arc-shaped catalyst packing members of the present invention;

[0040] Figure 8 It is a cross-sectional schematic diagram of the combination of two semi-arc-shaped catalyst packing members of the present invention;

[0041] Figure 9 For the present invention Figure 4 A magnified schematic diagram of point A;

[0042] Figure 10 For the present invention Figure 8 Enlarged schematic diagram of point B. DETAILED DESCRIPTION

[0043] The following detailed description provides various embodiments or examples for implementing the present invention. Of course, these are merely examples or embodiments and are not intended to be limiting. Furthermore, repeated reference numerals, such as repeated numbers and / or letters, may be used in different embodiments. Such repetition is for simplicity and clarity in describing the present invention and does not imply a specific relationship between the different embodiments and / or configurations discussed.

[0044] The present invention is further described below with reference to the accompanying drawings and specific embodiments: Figures 1 to 10 The VOCs treatment equipment based on room temperature ozone catalytic oxidation and micro-nano bubbles shown includes a pretreatment zone 1, a catalytic reaction zone 2, and a deep purification zone 3 connected in sequence, wherein:

[0045] The pretreatment zone 1 includes a high-volume cyclone dust collector 11 and a first ozone decomposition module 12; more than 99% of particulate matter in the VOCs waste gas is removed by the high-volume cyclone dust collector 11, and at the same time, the ozone generated by the first ozone decomposition module 12 is fully mixed with the VOCs waste gas to decompose the VOCs waste gas. The pretreatment zone also plays a certain buffering role, allowing it to enter the next process stably.

[0046] The catalytic reaction zone 2 includes an ozone catalytic oxidation reactor 21 and a second ozone decomposition module 22. The ozone catalytic oxidation reactor 21 includes a tank body 23 and a first catalyst filler 24, a first ozone generator 25 and a first aeration plate 26 arranged in the tank body 23. An opening 27 and an automatic replacement mechanism are provided on the outer wall of the tank body 23. A sealing plate 28 is sealed in the opening 27. The first catalyst filler 24 is detachably arranged on the inner side of the sealing plate 28. The automatic replacement mechanism can open the sealing plate 28 and replace the first catalyst filler 24. Through the setting of the ozone catalytic oxidation reactor 21, VOCs can be deeply oxidized and decomposed at room temperature, and cyclic compounds can also be ring-opening oxidized and decomposed.

[0047] In addition, the first catalyst filler 24 is detachable and can be automatically disassembled and replaced by an automatic replacement mechanism, which has high disassembly and installation efficiency, reduces manual labor intensity, and ensures the normal operation of the first catalyst filler.

[0048] The deep purification area 3 includes a micro-nano bubble spray module, which includes a spray tower 31, a second ozone generator 32, a second aeration disk 33 and a micro-nano bubble generator 34. A spray head 35 is provided on the upper part of the spray tower 31, and a liquid storage chamber 36 with alkaline solution is provided below. The second aeration disk 33 is provided in the liquid storage chamber 36 and is connected to the second ozone generator 32 through a pipeline. The spray head 35 is connected to the liquid storage chamber 36 through a circulation pipeline 37. The micro-nano bubble generator 34 It is located on the circulation pipe 37 and is equipped with a circulation water pump 38; the VOCs waste gas and the sprayed micro-nano bubble solution convect from bottom to top and mix evenly; the micro-nano bubbles have a high mass transfer efficiency due to their small particle size and large specific surface area. On the other hand, the pressure inside them is higher than normal pressure, which has a solubilizing effect on the remaining VOCs and ozone in the waste gas; at the same time, the rupture of the micro-nano bubbles will produce a high-temperature, high-pressure subcritical state locally, and produce more active oxygen free radicals, which enhances the degradation ability of the spraying process.

[0049] Therefore, the present invention achieves efficient degradation of VOCs under normal temperature conditions. Compared with existing commonly used technologies, including physical adsorption, photocatalytic degradation, plasma method, etc., it has lower operating costs and energy consumption and stronger operating stability.

[0050] Furthermore, by using the method and apparatus of the present invention in multi-stage combination, the degradation rate of VOCs in large-volume exhaust gas can be greatly improved, and the removal rate of difficult-to-degrade triphenyl pollutants can also be greatly improved.

[0051] In the present invention, the openings 27 are symmetrically provided with two, so that the sealing plates 28 are correspondingly provided with two, the first catalyst filler 24 is composed of two symmetrical semi-arc catalyst filler pieces 201, and the two semi-arc catalyst filler pieces 201 are correspondingly provided on the two sealing plates 28.

[0052] Furthermore, the automatic replacement mechanism includes a longitudinal guide assembly arranged between the semi-arc catalyst filler 201 and the sealing plate 28, and a guide limit assembly is provided on the longitudinal guide assembly, the guide limit assembly can limit the semi-arc catalyst filler 201 to prevent it from falling down, and transverse guide rails 202 are provided on both sides of the opening 27 of the tank body 23, and sliding members 203 are provided on both sides of the sealing plate 28. The sliding member 203 is slidably arranged in the transverse guide rails 202, and also includes a first power mechanism and a second power mechanism, the first power mechanism The two sealing plates 28 can move relative to each other, and the sealing plates 28 can be in an open state and then a closed state. A preparation area 204 is provided on the lower side of the opening 27 for placing the semi-arc catalyst filler 201 to be replaced. When the sealing plate 28 is in an open state, the semi-arc catalyst filler 201 in the preparation area 204 is arranged corresponding to the semi-arc catalyst filler 201 on the sealing plate 28. The second power mechanism can push the semi-arc catalyst filler 201 in the preparation area 204 upward, so that the semi-arc catalyst filler 201 in the preparation area 204 is moved onto the sealing plate 28.

[0053] The longitudinal guide assembly includes a first dovetail key 41 disposed on the inner side of the sealing plate 28 , and the semi-arc-shaped catalyst filler 201 is provided with a dovetail groove 42 that cooperates with the first dovetail key 41 .

[0054] The guide limit assembly includes a groove 51 arranged on the outside of the first dovetail key 41, and a spring 52 and a limit block 53 are arranged in the groove 51. The limit block 53 can limit the semi-arc catalyst filler 201 from falling downward, and the lower side of the outer end of the limit block 53 is a slope structure 54.

[0055] The first power mechanism includes a motor 61 provided on the tank body 23 and located between the two openings 27. A gear 62 is provided on the output shaft of the motor 61. A first rack 63 is provided on one of the sealing plates 28, and a second rack 64 is provided on the other sealing plate 28. The first rack 63 and the second rack 64 are rotationally symmetrically arranged and can both engage with the gear 62.

[0056] A second dovetail key 71 is provided on the preparation area 204 , and an arc-shaped limit strip 72 is provided on the outer side of the opening 27 . When the sealing plate 28 is in the open state, the sealing plate 28 rests on the arc-shaped limit strip 72 , and the first dovetail key 41 and the second dovetail key 71 are provided correspondingly.

[0057] The second power mechanism includes a hydraulic cylinder 81 disposed below the preparation area 204 . A support plate 82 for pushing the semi-arc-shaped catalyst filler 201 is disposed on the piston rod of the hydraulic cylinder 81 .

[0058] The first ozone decomposition module 12 is arranged on the first delivery pipe 91 between the pretreatment zone 1 and the catalytic reaction zone 2, and the second ozone decomposition module 22 is arranged on the second delivery pipe 92 between the catalytic reaction zone 2 and the deep purification zone 3. The first ozone decomposition module 12 and the second ozone decomposition module 22 are both ultraviolet lamps.

[0059] The specific working process of replacing the first catalyst filler 24 in the present invention is as follows:

[0060] The semi-arc catalyst filler 201 to be replaced is placed in the preparation area 204, and the dovetail groove 42 on the semi-arc catalyst filler 201 is set on the second dovetail key 71 on the preparation area 204, and then the semi-arc catalyst filler 201 is supported by the support plate 82; then, the motor 61 works, the gear 62 rotates and engages with the first rack 63 and the second rack 64, and the two sealing plates 28 drive the corresponding semi-arc catalyst filler 201 to move out of the tank body 23. After moving out, the first dovetail key 41 on the sealing plate 28 is corresponding to the second dovetail key 71 on the preparation area 204; the hydraulic cylinder 81 works, and drives the semi-arc catalyst filler to be installed to move upward through the support plate 82, and the semi-arc catalyst filler to be installed pushes the sealing plate 28 The semi-arc catalyst filler 201 moves upward and enters the first dovetail key 41 on the sealing plate 28, and the limit block 53 retracts inward. When it moves to the appropriate position, the limit block 53 pops outward, thereby limiting the semi-arc catalyst filler 201. The semi-arc catalyst filler that is pushed upward abuts against the side wall of the tank body 23 when the sealing plate 28 is closed, and when the sealing plate 28 is completely closed, the semi-arc catalyst filler falls freely. Of course, a limiter for limiting the semi-arc catalyst filler (similar to the structure of the arc limit strip 72) can be set on the side wall of the tank body 23, so that the replaced semi-arc catalyst filler can fall freely onto the support plate 82 for subsequent collection; thus, the entire replacement process requires less manual participation and the replacement efficiency is fast.

[0061] The present invention also provides a VOCs treatment method based on room-temperature ozone catalytic oxidation and micro-nano bubbles, comprising the following steps:

[0062] S1. Preprocessing:

[0063] The particulate matter in the VOCs waste gas is separated from the air flow by the large air volume cyclone dust collector 11. The VOCs waste gas after the particulate matter is separated is mixed with the first ozone decomposition module 12, and the VOCs waste gas is decomposed in the first conveying pipe 91;

[0064] S2. Catalytic reaction:

[0065] Ozone is generated by the first ozone generator 25 and enters the tank 23 through the first aeration plate 26, then passes through the first catalyst filler 24, and is mixed with the second ozone decomposition module 22, allowing the VOCs waste gas to be decomposed again in the second delivery pipe 92;

[0066] S3, deep purification:

[0067] Ozone is generated by the second ozone generator 32 and enters the spray tower 31 through the second aeration plate 33, and is mixed with the alkaline solution in the liquid storage chamber 36. The alkaline liquid containing ozone enters the micro-nano bubble generator 34 through the circulation pipe 37 and generates micro-nano bubbles, forming a liquid containing ozone and micro-nano bubbles, which is then sprayed out through the spray head 35.

[0068] Of course, a second catalyst filler 300 is further provided between the liquid storage chamber 36 and the shower head 35 .

[0069] In step S2, the catalytic oxidation reaction mechanism is as follows:

[0070] O3+active site→[O]+O2

[0071] O3+active site+H2O→2[·OH]+O2

[0072] VOCs+active site→[VOCs]

[0073] [VOCs]+[O]→[VOCsO·]+[O]→CO2+H2O

[0074] [VOCs]+[·OH]→[VOCsOH·]+[·OH]→CO2+H2O

[0075] In the catalytic reaction, most VOCs are degraded into smaller molecules or completely degraded into CO2 and H2O. At the same time, excess ozone is captured and decomposed in the ozone decomposition module at the end of the reaction to reduce ozone pollution in the exhaust gas.

[0076] Specifically, several embodiments of the VOCs treatment method based on room temperature ozone catalytic oxidation and micro-nano bubbles of the present invention are also provided:

[0077] Example 1:

[0078] In this example, the VOCs waste gas was glass fiber reinforced plastic (FRP) styrene waste gas, with an air volume of 20,000 m³ / h and an initial pollutant concentration of 220 mg / m³. The VOCs waste gas was first passed into a pretreatment zone, where particulate matter was removed before entering the catalytic reaction zone along with the generated ozone. It remained in the catalytic reaction zone for 30 seconds, with a tank containing 1,000 g of composite catalyst. After initial treatment, the waste gas entered a deep purification zone, where a spray water scrubbing module used a micro-nano bubble solution and glass fiber reinforced plastic as filler, with a residence time of 20 seconds. Using a single-stage process, the exhaust gas outlet concentration was 12.2 mg / m³, and the VOCs removal rate was 94.5%. No residual ozone was detected.

[0079] Example 2:

[0080] In this embodiment, the VOCs waste gas is glass fiber reinforced plastic styrene waste gas, the air volume is 20,000 m3 / h, and the initial pollutant concentration is 220 mg / m3; the VOCs waste gas is first passed into the pretreatment zone, the particulate matter is removed after passing through the pretreatment zone, and enters the catalytic reaction zone together with the generated ozone; it stays in the catalytic reaction zone for 30 seconds, and the tank body contains 1,000 g of composite catalyst; after preliminary treatment, the waste gas enters the deep purification zone, and the spray water washing module uses a micro-nano bubble solution, the filler is glass fiber reinforced plastic, and the residence time is 20 seconds; a two-stage process is used in combination, the waste gas outlet concentration is 1.4 mg / m3, and the VOCs removal rate is 99.4%; no ozone residue is detected.

[0081] Example 3:

[0082] In this example, the VOC waste gas is styrene waste gas, with an air volume of 160,000 m³ / h and an initial pollutant concentration of 250 mg / m³. The VOC waste gas is first passed into a pretreatment zone, where particulate matter is removed and then, along with the generated ozone, enters the catalytic reaction zone. It remains in the catalytic reaction zone for 60 seconds, with the tank containing 10,000 g of composite catalyst. After initial treatment, the waste gas enters a deep purification zone, where a spray water washing module uses a micro-nano bubble solution filled with polyethylene, with a residence time of 30 seconds. Using a two-stage process, the waste gas outlet concentration is 0.8 mg / m³, with a VOC removal rate of 99.7%. No residual ozone is detected.

[0083] Example 4:

[0084] In this example, the VOC waste gas was sludge drying waste gas, with a volume of 50,000 m³ / h and an initial pollutant concentration of 500 mg / m³. The VOC waste gas was first passed into a pretreatment zone, where particulate matter was removed before entering the catalytic reaction zone along with the generated ozone. It remained in the catalytic reaction zone for 60 seconds. The tank contained 5,000 g of a composite catalyst solution, with polyethylene as the filler, and a residence time of 30 seconds. Using a two-stage process, the exhaust gas outlet concentration was 3.9 mg / m³, and the VOC removal rate was 99.2%. No residual ozone was detected.

[0085] Example 5:

[0086] In this example, the VOC waste gas, derived from pharmaceutical organic waste, was flowed at a rate of 3500 m³ / h and an initial pollutant concentration of 740 mg / m³. The VOC waste gas was first passed through a pretreatment zone, where particulate matter was removed before entering the catalytic reaction zone along with the generated ozone. It remained in the catalytic reaction zone for 40 seconds, with a tank containing 500g of composite catalyst. After initial treatment, the waste gas entered a deep purification zone, where a spray water scrubber module used a micro-nano bubble solution filled with polyethylene for a 20-second residence time. Using a single-stage process, the waste gas outlet concentration was 18.7 mg / m³, and the VOC removal rate was 97.5%. No residual ozone was detected.

[0087] The basic principles, main features, and advantages of the present invention are shown and described above in conjunction with the accompanying drawings. Those skilled in the art should understand that the present invention is not limited to the above-described embodiments. The above-described embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention as claimed. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. VOCs treatment equipment based on room temperature ozone catalytic oxidation and micro-nano bubbles, characterized by: It comprises a pretreatment zone (1), a catalytic reaction zone (2) and a deep purification zone (3) which are connected in sequence, wherein: The pretreatment zone (1) includes a large air volume cyclone dust collector (11) and a first ozone decomposition module (12); The catalytic reaction zone (2) includes an ozone catalytic oxidation reactor (21) and a second ozone decomposition module (22). The ozone catalytic oxidation reactor (21) includes a tank body (23) and a first catalyst filler (24), a first ozone generating device (25) and a first aeration disk (26) arranged in the tank body (23). An opening (27) and an automatic replacement mechanism are provided on the outer wall of the tank body (23). A sealing plate (28) is sealed in the opening (27). The first catalyst filler (24) is detachably arranged on the inner side of the sealing plate (28). The automatic replacement mechanism can open the sealing plate (28) and replace the first catalyst filler (24). The deep purification zone (3) includes a micro-nano bubble spray module, which includes a spray tower (31), a second ozone generator (32), a second aeration disk (33) and a micro-nano bubble generator (34). A spray head (35) is provided on the upper inner portion of the spray tower (31), and a liquid storage chamber (36) storing an alkaline solution is provided on the lower inner portion. The second aeration disk (33) is provided in the liquid storage chamber (36) and is connected to the second ozone generator (32) through a pipeline. The spray head (35) is connected to the liquid storage chamber (36) through a circulation pipeline (37). The micro-nano bubble generator (34) is provided on the circulation pipeline (37) and is provided with a circulation water pump (38). The openings (27) are symmetrically provided with two, so that the sealing plates (28) are correspondingly provided with two. The first catalyst filler (24) is composed of two symmetrical semi-arc catalyst filler pieces (201). The two semi-arc catalyst filler pieces (201) are correspondingly provided on the two sealing plates (28). The automatic replacement mechanism includes a longitudinal guide component provided between the semi-arc catalyst filler piece (201) and the sealing plate (28), and a guide limit component is provided on the longitudinal guide component. The guide limit component can limit the semi-arc catalyst filler piece (201) to prevent it from falling down. Transverse guide rails (202) are provided on both sides of the opening (27) on the tank body (23), and sliding members (203) are provided on both sides of the sealing plate (28). The sliding member (203) is slidably provided in the transverse guide rails (202). The first power mechanism and the second power mechanism are also included. The first power mechanism The force mechanism can drive the two sealing plates (28) to move relative to each other, and enable the sealing plates (28) to be in an open state and then a closed state. A preparation area (204) for placing the semi-arc catalyst filler (201) to be replaced is provided on the lower side of the opening (27). When the sealing plate (28) is in the open state, the semi-arc catalyst filler (201) in the preparation area (204) is arranged corresponding to the semi-arc catalyst filler (201) on the sealing plate (28). The second power mechanism can push the semi-arc catalyst filler (201) in the preparation area (204) upward, so that the semi-arc catalyst filler (201) in the preparation area (204) moves to the sealing plate (28). The longitudinal guide assembly includes a first dovetail key (41) provided on the inner side of the sealing plate (28), and a dovetail groove (42) is provided on the semi-arc catalyst filler (201) to cooperate with the first dovetail key (41).

2. The VOCs treatment equipment based on room temperature ozone catalytic oxidation and micro-nano bubbles according to claim 1 is characterized in that: The guide limit assembly includes a groove (51) arranged outside the first dovetail key (41), a spring (52) and a limit block (53) are arranged in the groove (51), the limit block (53) can limit the semi-arc-shaped catalyst filler (201) from falling downward, and the lower side of the outer end of the limit block (53) is a slope structure (54).

3. The VOCs treatment equipment based on room temperature ozone catalytic oxidation and micro-nano bubbles according to claim 1 is characterized in that: The first power mechanism includes a motor (61) provided on the tank body (23) and located between the two openings (27); a gear (62) is provided on the output shaft of the motor (61); a first rack (63) is provided on one of the sealing plates (28); and a second rack (64) is provided on the other sealing plate (28); the first rack (63) and the second rack (64) are arranged in rotational symmetry and can both mesh with the gear (62).

4. The VOCs treatment equipment based on room temperature ozone catalytic oxidation and micro-nano bubbles according to claim 1 is characterized in that: A second dovetail key (71) is provided on the preparation area (204), and an arc-shaped limiting strip (72) is provided on the outer side of the opening (27). When the sealing plate (28) is in an open state, the sealing plate (28) abuts against the arc-shaped limiting strip (72), and the first dovetail key (41) and the second dovetail key (71) are provided correspondingly.

5. The VOCs treatment equipment based on room temperature ozone catalytic oxidation and micro-nano bubbles according to claim 4 is characterized in that: The second power mechanism comprises a hydraulic cylinder (81) arranged below the preparation area (204), and a support plate (82) for pushing the semi-arc-shaped catalyst filler (201) is provided on the piston rod of the hydraulic cylinder (81).

6. The VOCs treatment equipment based on room temperature ozone catalytic oxidation and micro-nano bubbles according to claim 1 is characterized in that: The first ozone decomposition module (12) is arranged on a first delivery pipe (91) between the pretreatment zone (1) and the catalytic reaction zone (2), and the second ozone decomposition module (22) is arranged on a second delivery pipe (92) between the catalytic reaction zone (2) and the deep purification zone (3). Both the first ozone decomposition module (12) and the second ozone decomposition module (22) are ultraviolet lamps.

7. A VOCs treatment method based on room temperature ozone catalytic oxidation and micro-nano bubbles, using the VOCs treatment equipment of claim 6, characterized in that: The following steps are involved: S1. Preprocessing: The particulate matter in the VOCs waste gas is separated from the air flow by a large air volume cyclone dust collector (11), the VOCs waste gas after the particulate matter is separated is mixed with the first ozone decomposition module (12), and the VOCs waste gas is decomposed in the first conveying pipe (91); S2. Catalytic reaction: Ozone is generated by the first ozone generating device (25) and enters the tank body (23) through the first aeration plate (26), then passes through the first catalyst filler (24), and is mixed with the second ozone decomposition module (22), so that the VOCs waste gas is decomposed again in the second delivery pipe (92); S3, deep purification: Ozone is generated by the second ozone generating device (32) and enters the spray tower (31) through the second aeration plate (33) and is mixed with the alkaline solution in the liquid storage chamber (36). The alkaline liquid containing ozone enters the micro-nano bubble generator (34) through the circulation pipe (37) and generates micro-nano bubbles, forming a liquid containing ozone and micro-nano bubbles, which is then sprayed out through the spray head (35).

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