Organic waste gas treatment device by coupling molecular sieve ozone catalytic oxidation and use method thereof

Abstract

The invention relates to a coupling molecular sieve ozone catalytic oxidation organic waste gas treatment device and a use method thereof in the field of environmental protection. The device comprises a cooling device, a molecular sieve device, a spraying absorption device, a wastewater treatment device and an ozone generation device, the molecular sieve device comprises a molecular sieve box, the molecular sieve box is filled with molecular sieve particles, and the stirring blades are inserted into the molecular sieve particles; an atomizing nozzle is arranged at the top in a spraying tower of the spraying absorption device, a water outlet in the bottom of the spraying tower is connected to a water tank, and a circulating water pump is arranged between the atomizing nozzle and the water tank; a plurality of baffle plates are arranged in the spray tower from top to bottom; at least one catalyst loading layer is arranged in a water tank of the wastewater treatment device, and a catalyst is loaded in the catalyst loading layer; an ozone outlet of the ozone generating device is connected to the molecular sieve box and the aeration head, and the aeration head is positioned in the water tank. The device treats organic waste gas through catalytic ozonation, and is high in treatment efficiency, low in operation cost, simple to operate and easy to maintain.

Description

Technical Field

[0001] The present invention relates to the field of environmental protection, and in particular to a coupled molecular sieve ozone catalytic oxidation organic waste gas treatment device and a use method thereof. Background Art

[0002] Volatile Organic Compounds (VOCs) generally refer to organic compounds with a boiling point below 260°C at normal pressure or a saturated vapor pressure greater than 71Pa at room temperature. As an important type of environmental pollutant, VOCs emissions continue to grow under the rapid development of modern industrialization, which has attracted widespread attention from the country and society. VOCs are highly toxic and carcinogenic. Most VOCs emitted into the atmosphere can lead to the formation of secondary pollutants, such as ozone, peroxyacetyl nitrate and secondary organic aerosols in the troposphere. They are important primers for the formation of PM2.5 and PM10 in the atmosphere and can cause serious harm to human health. Therefore, effective treatment of organic waste gas is related to the health quality of all mankind and the earth's atmospheric environment.

[0003] Ozone has strong oxidizing properties. Under ideal reaction conditions, ozone can oxidize most elements and compounds in the environment to the highest oxidation state, and has a strong oxidative degradation effect on organic matter. Therefore, the application of ozone oxidation technology in the treatment of organic waste gas has a good prospect. Despite this, single ozone oxidation technology still has great limitations. First, ozone has poor reaction selectivity with organic matter and cannot oxidize some difficult-to-degrade organic matter, such as chloroform; second, single ozone oxidation technology cannot completely decompose organic matter into carbon dioxide and water, and it is difficult to achieve a high removal effect. Its products are often carboxylic acid organic matter, such as: monoaldehyde, dialdehyde, monocarboxylic acid, dicarboxylic acid and other organic small molecules. Therefore, how to apply ozone catalytic oxidation to waste gas and wastewater treatment requires further research and development. Summary of the invention

[0004] The purpose of the present invention is to solve the problem of low efficiency of organic waste gas treatment and easy formation of secondary pollution in the existing organic waste gas treatment technology, and propose a coupled molecular sieve ozone catalytic oxidation organic waste gas treatment device and its use method, which utilizes ozone catalytic oxidation to treat organic waste gas, so that the organic waste gas is degraded into carbon dioxide, water and small molecular organic matter, and the excess ozone and small molecular organic matter are absorbed in the spray tower, and the spray wastewater is treated by ozone catalytic oxidation in the water tank. The organic waste gas treatment efficiency is high, almost no pollution is generated, the operating cost is low, the operation is simple and easy to maintain, and it has engineering operability.

[0005] The object of the present invention is achieved as follows: a coupled molecular sieve ozone catalytic oxidation organic waste gas treatment device, comprising a cooling device, a molecular sieve device, a spray absorption device, a wastewater treatment device and an ozone generating device; the cooling device comprises a cooling box, a cooling pipe with a reciprocating bend is arranged in the cooling box, a spray head is arranged in the cooling box, and the spray head is connected to the water outlet of a water pump; the inlet of the cooling pipe is connected to the gas source to be treated; the molecular sieve device comprises a molecular sieve box, a motor is arranged on the top of the molecular sieve box, a stirring shaft is connected to the motor shaft end, a stirring blade is arranged on the stirring shaft, the molecular sieve box is filled with molecular sieve particles, and the stirring blade is inserted into the molecular sieve particles; the lower part of the side of the molecular sieve box is connected to the outlet of the cooling pipe, and the upper part of the side of the molecular sieve box is connected to the outlet of the cooling pipe. A molecular sieve box outlet is provided; the spray absorption device comprises a vertically arranged spray tower, a gas distributor is provided at the lower part of the spray tower, the gas distributor is connected to the molecular sieve box outlet through an air suction pump, a spray tower outlet is provided at the upper part of the side of the spray tower, an atomizing nozzle is provided at the top of the spray tower, the water outlet at the bottom of the spray tower is connected to a water tank, and a circulating water pump is provided between the atomizing nozzle and the water tank; a plurality of baffles are provided from top to bottom in the spray tower; the wastewater treatment device comprises a water tank, at least one catalyst loading layer is provided in the water tank, and the catalyst loading layer is loaded with a catalyst; the ozone generating device comprises an ozone outlet, and the ozone outlet is divided into two routes, one of which is connected to the bottom of the molecular sieve box, and an aeration head is provided at the outlet position of the other route, and the aeration head is located in the water tank.

[0006] Furthermore, the filling amount of the molecular sieve particles is 30%-70% of the total volume of the molecular sieve box.

[0007] Furthermore, the baffle is connected to the inner wall on the left and right sides of the spray tower, the baffle extends obliquely downward from the outside to the center, the baffles on the left and right sides are interspersed with each other, a plurality of strip-shaped drainage holes are provided on the baffle, the length direction of the drainage hole is perpendicular to the inclination direction of the baffle, and the upper side of the drainage hole is provided with an upward bending section. This solution solves the following technical problems: First, when the airflow rises, a part of the airflow bypasses the baffle and moves upward in a reciprocating manner, and its flow process becomes longer, so that the gas-liquid contact is more complete. Second, the setting of the baffle and the drainage hole can increase the gas-liquid contact area, and part of the gas passes through the drainage hole upward, and can have more contact with the liquid descending from the edge of the drainage hole. Third, the bending section has a water-blocking effect, which slows down the downward trend of the water flow, so that the gas-liquid contact is more complete.

[0008] For ease of manufacturing, the baffle is made by stamping a thin plate, a rectangular slit connected on one side is punched out of the thin plate, and the plate is bent along the connected position to form a drainage hole and a bent section at the same time.

[0009] Furthermore, a plurality of saw teeth are correspondingly arranged on the long sides and the bending sections of the drainage holes, and the drainage holes in adjacent rows are staggered. The sawtooth shape can further increase the specific surface area, and at the same time, the sawtooth shape can divide the water flow into multiple small runoffs, and can also increase the gas-liquid contact opportunity.

[0010] A further improvement of the present invention is that the catalyst loading layer in the water tank is provided with more than three layers, an overflow plate is provided in the water tank to separate the water tank into two parts, the overflow plate passes through all the catalyst loading layers upward, a water flow channel is provided on the lower side of the overflow plate to connect the left and right sides of the water tank, the aeration head is arranged at the inner bottom of the left side of the water tank, the water inlet of the water tank connected to the water outlet at the bottom of the spray tower is arranged on the left side wall of the water tank, and the water outlet of the water tank connected to the circulating water pump is arranged on the right side of the water tank. This structure enables the left and right sides of the overflow plate to form a laminar flow cycle as a whole, the gas generated by the aeration head pushes the water upward in the water, forms an upward force, and makes the gas and water pass upward through the catalyst loading layer on one side, and then overflows and goes down from the other side, part of the gas is separated from the water, and a small amount of fine gas does not have time to separate and goes down again with the water, and then returns to the left side of the water tank through the water flow channel, completing a cycle; the spray wastewater in the water tank is recycled by the circulating water pump. This structure can prevent the water from being pumped into the spray tower by the circulating pump without being treated, and at the same time increases the flow of water, so that its organic matter can be further degraded.

[0011] Except for this, a gas redistribution plate is tilted on the lower side of each catalyst loading layer, and a number of triangular distribution holes are arranged in an array on the gas redistribution plate. When the gas passes through the bottom catalyst loading layer, some small bubbles gather and merge to form large bubbles. After passing through the gas redistribution plate, the large bubbles can be divided, thereby ensuring that the whole has a larger specific surface area. The triangular distribution holes can better divide the bubbles and break them as quickly as possible.

[0012] Furthermore, a box cover is provided on the top of the water tank, an exhaust pipe is provided on the box cover, and an air flow baffle is provided in the box body to separate the box body space corresponding to the front end of the exhaust pipe into a maze channel. The maze channel can prevent liquid from being discharged with gas, and can prevent the discharge of entrained pollutants.

[0013] The method for using the above-mentioned coupled molecular sieve ozone catalytic oxidation organic waste gas treatment device comprises the following steps: 1) Using dry purified air or oxygen as raw materials, ozone is produced when the high voltage AC reaches 10-15KV; the ozone-containing gas is supplied to the molecular sieve box and water tank; 2) Add water to the water tank, start the circulating water pump, and allow the return water in the spray tower to enter the water tank. Continue to add water until the water level is higher than the overflow plate after stabilization, and then stop adding water; 3) Load molecular sieve particles into the molecular sieve box, the filling amount is 30%-70% of the total volume of the molecular sieve box, and start the motor so that the stirring blades continuously stir the molecular sieve particles; 4) Start the water pump to allow the sprinkler head to continue spraying to cool the cooling pipe; 5) Start the suction pump. After the high-temperature waste gas to be treated is cooled by the cooling pipe, it enters the molecular sieve box. The waste gas contacts the ozone generated by the ozone generator and is degraded into carbon dioxide, water and small molecular organic matter by the ozone and the strong oxidizing free radicals generated by the ozone catalysis. Then the waste gas enters the spray tower. The atomized water absorbs the excess ozone and small molecular organic matter. The baffle makes the airflow reciprocate. The several drainage holes divide the airflow upward. The bending section has a flow blocking effect. The three work together to give water and gas more contact opportunities, which can fully absorb the organic matter in the waste gas. The water that absorbs the organic matter and excess ozone flows back to the water tank from the bottom of the spray tower. The tail gas that meets the requirements after treatment is discharged. If it does not meet the environmental protection requirements, the tail gas will flow back to the inlet of the cooling pipe for secondary treatment. 6) In the water tank, the aeration head breaks up and discharges the bromine-oxygen-containing gas from the ozone generator. The catalyst loading layer is loaded with a catalyst. The wastewater undergoes an ozone-catalyzed oxidation reaction in the water tank, and the organic matter is further degraded. The gas generated by the aeration head is mixed with the water, which reduces the overall density of the water, thereby forming a driving force for the water to rise. The water flows upward through each catalyst loading layer in a laminar state, and then overflows downward from the upper end of the overflow plate. Part of the gas separates from the liquid, and a small amount of fine gas does not have time to separate and goes down again with the water, and then returns to the left side of the water tank through the water flow channel, completing a cycle; the spray wastewater in the water tank is recycled by the circulating water pump.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The present invention improves the efficiency of treating organic waste gas, improves the utilization rate of molecular sieves, makes full use of ozone oxidation and catalyst adsorption catalytic capabilities, and expands the types and concentrations of treated organic waste gas. Its molecular sieve device can not only strongly oxidize organic waste gas and degrade it into carbon dioxide, water and small molecular organic matter, but also use stirring blades to improve the utilization rate of molecular sieves and facilitate the replacement of molecular sieves. The subsequent spray absorption device absorbs the generated small molecular organic matter and excess ozone. The spray wastewater after absorption is treated with ozone catalytic oxidation in the water tank to reduce secondary pollution and allow the spray liquid to be recycled. The entire process has less pollution, low operating costs, and engineering operability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a flow chart of the present invention, in which the hollow arrows represent the direction of air flow, and the solid arrows represent the direction of water flow.

[0016] Figure 2 Schematic diagram of the three-dimensional structure of the baffle.

[0017] Figure 3 for Figure 2 A partial enlarged view of middle A.

[0018] Figure 4 This is a schematic diagram of the structure of a wastewater treatment plant.

[0019] Figure 5 This is a plan view of the partial structure of the gas redistribution plate.

[0020] In the figure, 1 is an ozone generator, 2 is a cooling pipe, 3 is a cooling box, 4 is a spray head, 5 is a water pump, 6 is an ozone outlet, 7 is a molecular sieve particle, 8 is a stirring blade, 9 is a stirring shaft, 10 is a motor, 11 is a molecular sieve box air outlet, 12 is a molecular sieve box, 13 is an air suction pump, 14 is a spray tower, 15 is an atomizing nozzle, 16 is a spray tower air outlet, 17 is a baffle, 17a is a bending section, 17b is a drainage hole, 17c is a sawtooth, 18 is a gas distributor, 19 is a circulating water pump, 20 is an exhaust pipe, 21 is a water tank, 22 is a catalyst loading layer, 23 is an overflow plate, 24 is an aeration head, 25 is a box cover, 26 is an air flow baffle, 27 is a gas redistribution plate, 27a is a distribution hole, 28 is a water tank water outlet, 29 is a water tank water inlet, and 30 is a water flow channel. DETAILED DESCRIPTION

[0021] like Figure 1-5 As shown, a coupled molecular sieve ozone catalytic oxidation organic waste gas treatment device, the structure of which mainly includes a cooling device, a molecular sieve device, a spray absorption device, a wastewater treatment device and an ozone generating device 1.

[0022] The cooling device comprises a cooling box 3, in which a reciprocatingly bent cooling pipe 2 is arranged, and in which a spray head 4 is arranged, and the spray head 4 is connected to the water outlet of a water pump 5; the inlet of the cooling pipe 2 is connected to the gas source to be processed.

[0023] The molecular sieve device includes a molecular sieve box 12, a motor 10 is provided on the top of the molecular sieve box 12, a stirring shaft 9 is connected to the shaft end of the motor 10, a stirring blade 8 is provided on the stirring shaft 9, the molecular sieve box 12 is filled with molecular sieve particles 7, and the stirring blade 8 is inserted into the molecular sieve particles 7; the filling amount of the molecular sieve particles 7 is 50% of the total volume of the molecular sieve box 12, and 30%-70% can be selected; the lower part of the side of the molecular sieve box 12 is connected to the outlet of the cooling pipe 2, and the upper part of the side of the molecular sieve box 12 is provided with a molecular sieve box air outlet 11.

[0024] The spray absorption device includes a vertically arranged spray tower 14, a gas distributor 18 is provided at the lower part of the spray tower 14, the gas distributor 18 is connected to the molecular sieve box outlet 11 through the suction pump 13, a spray tower outlet 16 is provided at the upper part of the side of the spray tower 14, an atomizing nozzle 15 is provided at the top of the spray tower 14, the water outlet at the bottom of the spray tower 14 is connected to the water tank 21, and a circulating water pump 19 is provided between the atomizing nozzle 15 and the water tank 21; a plurality of baffles 17 are provided from top to bottom in the spray tower 14.

[0025] The wastewater treatment device comprises a water tank 21 , in which a catalyst loading layer 22 is arranged. The catalyst loading layer 22 preferably has three layers or more, and the catalyst loading layer 22 is loaded with a catalyst.

[0026] The ozone generating device 1 comprises an ozone outlet 6 , which is divided into two paths. One path is connected to the bottom of the molecular sieve box 12 , and an aeration head 24 is provided at the outlet of the other path. The aeration head 24 is located in the water tank 21 .

[0027] The baffles 17 are connected to the inner walls on the left and right sides of the spray tower 14. The baffles 17 extend downward from the outside to the center. The baffles 17 on the left and right sides are interlaced with each other. The baffles 17 are provided with a plurality of strip-shaped drainage holes 17b. The length direction of the drainage holes 17b is perpendicular to the inclination direction of the baffles 17. The upper side of the drainage holes 17b is provided with an upward bending section 17a. The baffles 17 are made by stamping a thin plate. A rectangular slit connected to one side is punched out on the thin plate, and the plate is bent along the connected position to form the drainage holes 17b and the bending section 17a at the same time. A plurality of saw teeth 17c are correspondingly provided on the long side of the drainage holes 17b and the bending section 17a, and the drainage holes 17b in adjacent rows are staggered.

[0028] An overflow plate 23 is provided in the water tank 21 to separate the water tank 21 into two parts, the overflow plate 23 passes through all the catalyst loading layers 22 upwards, a water flow channel 30 is provided on the lower side of the overflow plate 23 to connect the left and right sides of the water tank 21, an aeration head 24 is provided at the inner bottom of the left side of the water tank 21, a water tank inlet 29 connected to the water outlet at the bottom of the spray tower 14 is provided on the left side wall of the water tank 21, and a water tank outlet 28 connected to the circulating water pump 19 is provided on the right side of the water tank 21. Except for the bottommost catalyst loading layer 22, a gas redistribution plate 27 is provided obliquely on the lower side of each catalyst loading layer 22, and a plurality of triangular distribution holes 27a are provided in an array on the gas redistribution plate 27.

[0029] A box cover 25 is provided on the top of the water tank 21, and an exhaust pipe 20 is provided on the box cover 25. An air flow baffle 26 is provided inside the box body to divide the space inside the box body corresponding to the front end of the exhaust pipe 20 into a maze channel.

[0030] The method for using the above-mentioned coupled molecular sieve ozone catalytic oxidation organic waste gas treatment device comprises the following steps: 1) Using dry purified air or oxygen as raw materials, ozone is produced when the high voltage AC reaches 10-15KV; the gas containing bromine and oxygen is supplied to the molecular sieve box 12 and the water tank 21; the ozone flow rate is 1.5L / min, and the ozone gas concentration is 300mg / L; 2) Add water to the water tank 21, start the circulating water pump 19, and the return water in the spray tower 14 enters the water tank 21. Continue to add water until the water level is higher than the overflow plate 23 after stabilization, and then stop the water intake. The water can also be replaced by other acid-base absorption liquids, and a suitable organic solvent can also be selected according to the physical and chemical properties of the organic waste gas; 3) Load the molecular sieve particles 7 into the molecular sieve box 12, the filling amount being 30%-70% of the total volume of the molecular sieve box 12, and start the motor 10 so that the stirring blades 8 continuously push the molecular sieve particles 7 to change positions; 4) Start the water pump 5 to make the spray head 4 spray the cooling pipe 2 continuously to cool it down; 5) Start the suction pump 13, the organic waste gas to be treated containing benzyl alcohol, xylene and epichlorohydrin is cooled by the cooling pipe 2 and enters the molecular sieve box 12, the waste gas contacts the ozone generated by the ozone generator 1, and is degraded into carbon dioxide, water and small molecular organic matter by the ozone and the strong oxidizing free radicals generated by the ozone catalysis; then the waste gas enters the spray tower 14, the atomizing nozzle 15 sprays a fine mist liquid, which can fully contact with the small molecular organic matter and better absorb the excess ozone and small molecular organic matter, the baffle 17 makes the airflow reciprocate, the plurality of drainage holes 17b makes the airflow be divided and moved upward, the bending section 17a has a flow blocking effect, the three work together to give water and gas more contact opportunities, and can fully absorb the organic matter in the waste gas, the water that absorbs the organic matter and the excess ozone flows back from the bottom of the spray tower 14 to the water tank 21, and the tail gas that meets the requirements after treatment is discharged; if it does not meet the environmental protection requirements, the tail gas is returned to the inlet of the cooling pipe 2 for secondary treatment; 6) In the water tank 21, the aeration head 24 breaks up and discharges the bromine-oxygen-containing gas from the ozone generator 1, and the catalyst loading layer 22 is loaded with a catalyst. The wastewater undergoes an ozone catalytic oxidation reaction in the water tank 21, and the organic matter is further degraded. The gas generated by the aeration head 24 is mixed with the water, which reduces the overall density of the water, thereby forming a driving force for the water flow to rise. The water flows upward through each catalyst loading layer 22 in a laminar state, and then overflows downward from the upper end of the overflow plate 23. Part of the gas separates and leaves the liquid, and a small amount of fine gas does not have time to separate and goes down again with the water, and then returns to the left side of the water tank 21 through the water flow channel 30, completing a cycle; the spray wastewater in the water tank 21 is recycled by the circulating water pump 19.

[0031] The present invention has an ozone concentration of 12 mg / L and an organic matter inlet concentration of 500 mg / m 3 Using molecular sieve catalyst, molecular sieve particles 7 account for 50% of the total volume of the molecular sieve box 12, the reaction time of the molecular sieve device is 3s, and under the condition of absorption liquid pH=8, the treatment efficiency of benzyl alcohol, xylene and epichlorohydrin waste gas is above 95%.

[0032] The present invention is not limited to the above-mentioned embodiments. On the basis of the technical solution disclosed in the present invention, technicians in this field can make some substitutions and deformations to some technical features therein according to the disclosed technical content without creative labor, and these substitutions and deformations are all within the protection scope of the present invention.

Claims

1. A coupled molecular sieve ozone catalytic oxidation organic waste gas treatment device, characterized in that: It includes a cooling device, a molecular sieve device, a spray absorption device, a wastewater treatment device and an ozone generating device (1); The cooling device comprises a cooling box (3), a reciprocatingly bent cooling pipe (2) is arranged in the cooling box (3), a spray head (4) is arranged in the cooling box (3), and the spray head (4) is connected to the water outlet of the water pump (5); the inlet of the cooling pipe (2) is connected to the gas source to be treated; The molecular sieve device comprises a molecular sieve box (12), a motor (10) is provided on the top of the molecular sieve box (12), a stirring shaft (9) is drivingly connected to the shaft end of the motor (10), a stirring blade (8) is provided on the stirring shaft (9), the molecular sieve box (12) is filled with molecular sieve particles (7), and the stirring blade (8) is inserted into the molecular sieve particles (7); the lower part of the side of the molecular sieve box (12) is connected to the outlet of the cooling pipe (2), and the upper part of the side of the molecular sieve box (12) is provided with a molecular sieve box air outlet (11); The spray absorption device comprises a vertically arranged spray tower (14), a gas distributor (18) is provided at the lower part of the spray tower (14), the gas distributor (18) is connected to the molecular sieve box gas outlet (11) through an air suction pump (13), a spray tower gas outlet (16) is provided at the upper part of the side of the spray tower (14), an atomizing nozzle (15) is provided at the top of the spray tower (14), a water outlet at the bottom of the spray tower (14) is connected to a water tank (21), and a circulating water pump (19) is provided between the atomizing nozzle (15) and the water tank (21); a plurality of baffles (17) are provided from top to bottom in the spray tower (14); The wastewater treatment device comprises a water tank (21), wherein at least one catalyst loading layer (22) is provided in the water tank (21), and the catalyst loading layer (22) is loaded with a catalyst; The ozone generating device (1) comprises an ozone outlet (6), wherein the ozone outlet (6) is divided into two paths, one of which is connected to the bottom of the molecular sieve box (12), and the other of which is provided with an aeration head (24) at the outlet position, wherein the aeration head (24) is located in the water tank (21).

2. The coupled molecular sieve ozone catalytic oxidation organic waste gas treatment device according to claim 1 is characterized in that: The filling amount of the molecular sieve particles (7) is 30% to 70% of the total volume of the molecular sieve box (12).

3. The coupled molecular sieve ozone catalytic oxidation organic waste gas treatment device according to claim 1 is characterized in that: The baffles (17) are connected to the inner walls on the left and right sides of the spray tower (14), the baffles (17) extend obliquely downward from the outside to the center, the baffles (17) on the left and right sides are arranged to intersect with each other, and a plurality of strip-shaped drainage holes (17b) are provided on the baffles (17), the length direction of the drainage holes (17b) is perpendicular to the inclination direction of the baffles (17), and the upper side of the drainage holes (17b) is provided with an upward bending section (17a).

4. The coupled molecular sieve ozone catalytic oxidation organic waste gas treatment device according to claim 1 is characterized in that: The baffle (17) is made by stamping a thin plate, and a rectangular slit connected on one side is punched out of the thin plate, which is bent along the connected position to simultaneously form a drainage hole (17b) and a bent section (17a).

5. The coupled molecular sieve ozone catalytic oxidation organic waste gas treatment device according to claim 4 is characterized in that: A plurality of saw teeth (17c) are correspondingly provided on the long sides and the bent sections (17a) of the drainage holes (17b), and the drainage holes (17b) in adjacent rows are staggered.

6. A coupled molecular sieve ozone catalytic oxidation organic waste gas treatment device according to any one of claims 1 to 5, characterized in that: The catalyst loading layer (22) in the water tank (21) is provided with more than three layers. An overflow plate (23) is provided in the water tank (21) to divide the water tank (21) into two parts, the overflow plate (23) passes through all the catalyst loading layers (22) upwards, and a water flow channel (30) is provided on the lower side of the overflow plate (23) to connect the left and right sides of the water tank (21). The aeration head (24) is arranged at the inner bottom of the left side of the water tank (21). The water inlet (29) of the water tank connected to the water outlet at the bottom of the spray tower (14) is arranged on the left side wall of the water tank (21). The water outlet (29) of the water tank connected to the circulating water pump (19) is arranged on the right side of the water tank (21).

7. The coupled molecular sieve ozone catalytic oxidation organic waste gas treatment device according to claim 6, characterized in that: Except for the bottommost catalyst loading layer (22), each of the remaining catalyst loading layers (22) is provided with a gas redistribution plate (27) at an angle on its lower side, and a plurality of triangular distribution holes (27a) are arranged in an array on the gas redistribution plate (27).

8. The coupled molecular sieve ozone catalytic oxidation organic waste gas treatment device according to claim 7 is characterized in that: The water tank (21) is provided with a tank cover (25) on the top, an exhaust pipe (20) is provided on the tank cover (25), and an air flow baffle (26) is provided inside the tank body to divide the space inside the tank body corresponding to the front end of the exhaust pipe (20) into a maze channel.

9. The method for using a coupled molecular sieve ozone catalytic oxidation organic waste gas treatment device according to claim 6, characterized in that: The steps include: 1) Using dry purified air or oxygen as raw material, ozone is produced when the high voltage alternating current reaches 10-15KV; the ozone-containing gas is supplied to a molecular sieve box (12) and a water tank (21); 2) adding water to the water tank (21), starting the circulating water pump (19), and allowing the return water in the spray tower (14) to enter the water tank (21). Water is continuously added until the water level is higher than the overflow plate (23) after stabilization, and then stopping the water intake; 3) Loading molecular sieve particles (7) into the molecular sieve box (14) with a filling amount of 30% to 70% of the total volume of the molecular sieve box (12), and starting the motor (10) so that the stirring blades (8) continuously push the molecular sieve particles (7) to change positions; 4) starting the water pump (5) so that the spray head (5) continuously sprays to cool the cooling pipe (2); 5) Start the suction pump (13), the organic waste gas to be treated is cooled by the cooling pipe (2), and then enters the molecular sieve box (12), the organic waste gas contacts the ozone generated by the ozone generator (1), and is degraded into carbon dioxide, water and small molecular organic matter by the ozone and the strong oxidizing free radicals generated by the ozone catalysis; then the waste gas enters the spray tower (14), the atomized water absorbs the excess ozone and small molecular organic matter, the baffle (17) makes the air flow reciprocate, the plurality of drainage holes (17b) divides the air flow and makes it move upward, the bending section (17a) has a flow blocking effect, the three together make the water and the gas have more contact opportunities, and can fully absorb the organic matter in the waste gas, the water that absorbs the organic matter and the excess ozone flows back from the bottom of the spray tower to the water tank (21), and the tail gas that meets the requirements after treatment is discharged; If the environmental protection requirements are not met, the exhaust gas is returned to the inlet of the cooling pipe (2) for secondary treatment; 6) In the water tank (21), the aeration head (24) breaks up and discharges the ozone-containing gas from the ozone generator (1). The catalyst loading layer (22) is loaded with a catalyst. The wastewater undergoes an ozone catalytic oxidation reaction in the water tank (21), and the organic matter is further degraded. The gas generated by the aeration head (24) is mixed with the water, which reduces the overall density of the water, thereby forming a driving force for the water to rise. The water flows upward through each catalyst loading layer (22) in a laminar flow state, and then overflows downward from the upper end of the overflow plate (23). Part of the gas separates and leaves the liquid, and a small amount of fine gas does not have time to separate and flows downward again with the water, and then returns to the left side of the water tank through the water flow channel (30), completing a cycle; the spray wastewater in the water tank (21) is recycled by the circulating water pump (19).

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