VOCs (Volatile Organic Compounds) room-temperature decomposition system and method for purifying industrial waste gas by utilizing ozone and spray tower

Abstract

The invention belongs to the technical field of ozone and VOCs decomposition, and relates to a VOCs room temperature decomposition system and method for purifying industrial waste gas by utilizing ozone and a spray tower. The VOCs decomposition system comprises a mixing system, a two-stage catalytic ozonation system and an ozone spraying system. Furthermore, VOCs are decomposed at room temperature by utilizing the system, VOCs in industrial waste gas are removed through ozone, and the economic cost is low. Compared with an existing catalytic oxidation technology, the VOCs decomposition system and the two-stage catalytic ozonization system are connected in series, industrial VOCs waste gas can be subjected to catalytic reaction treatment at the room temperature, deep purification is achieved, the problem that in the prior art, catalytic reaction needs to be carried out at the high temperature is solved, ozone secondary pollution is treated through the ozone spraying system, and the treatment effect is good. The method has the advantages of high efficiency and low cost.

Description

Technical Field

[0001] The invention belongs to the technical field of ozone and VOCs decomposition, and more specifically relates to a VOCs room temperature decomposition system and method for purifying industrial waste gas by using ozone and a spray tower. Background Art

[0002] Petrochemicals, industrial spraying and packaging printing are one of the main sources of volatile organic compounds (VOCs) in the environment. There are many existing methods for controlling industrial VOCs emissions. Among them, the more mainstream technology is to use thermal storage incineration technology (RTO) for high-concentration scenarios, which directly burns VOCs into carbon dioxide and then emits them into the atmosphere. Another is to use catalytic oxidation technology (RCO) for medium and low concentration VOCs emissions, which rapidly converts VOCs into water and carbon dioxide at high temperatures through catalytic oxidation at the catalyst interface. Compared with thermal storage incineration technology, catalytic oxidation has the advantages of lower process operating costs, energy saving and higher safety, making it an ideal process route for industrial VOCs management.

[0003] Although catalytic oxidation technology has great advantages in processing efficiency, the catalytic reaction still needs to be carried out at high temperature (300-800°C). The resulting high energy consumption and high carbon emissions still restrict its development in the field of VOCs decomposition technology.

[0004] In the prior art, the VOCs catalytic purification method and device generally remove the ozone contained in the tail gas through a tail gas destroyer, and the ozone catalyst needs to be frequently replaced to solve the secondary pollution that may be caused by the ozone in the tail gas.

[0005] How to provide an integrated device that can be used for room temperature catalytic purification of VOCs under room temperature conditions while overcoming the impact of ozone emissions in exhaust gas on the environment has become a difficult problem that technical personnel in this field urgently need to overcome. Summary of the invention

[0006] The purpose of the present invention is to provide a VOCs room temperature decomposition system and method for industrial waste gas purification using ozone and a spray tower, so as to solve the problems existing in the above-mentioned prior art and realize the purification of industrial waste gas at room temperature.

[0007] To achieve the above object, the present invention provides the following solutions:

[0008] One of the technical solutions of the present invention is to provide a VOCs room temperature decomposition system for industrial waste gas purification using ozone and a spray tower, comprising:

[0009] A mixing system, comprising a mixer, a VOCs waste gas collection system and an ozone generation system; the VOCs waste gas collection system and the ozone generation system are respectively connected to the mixer;

[0010] A catalytic ozonation system, comprising a drying system, a first-stage catalytic ozonation system and a second-stage catalytic ozonation system connected in sequence; the drying system is connected to the mixer;

[0011] The ozone spray system comprises a connected spray tower and a reduction system; the bottom of the spray tower is connected to the second-stage catalytic ozonation system through a pipeline; and a nozzle is arranged on the top of the spray tower.

[0012] Furthermore, the ozone generating system comprises an oxygen concentrator and an ozone generator connected in sequence; wherein the ozone generator is connected to the mixer.

[0013] Furthermore, the VOCs waste gas collection system includes a gas collection hood and a fan, and the industrial waste gas is collected and transported through the gas collection hood and the fan.

[0014] Furthermore, a manganese-cobalt catalyst fixed bed (manganese-cobalt honeycomb ceramic monolithic catalyst) is provided in the first-stage catalytic ozonation system and the second-stage catalytic ozonation system.

[0015] Furthermore, a fixed bed of ozone and VOCs synergistic decomposition catalyst composed of ceramic Raschig rings (manganese-cobalt ceramic Raschig ring monolithic catalyst) is arranged in the tower column of the spray tower.

[0016] Furthermore, the reduction system includes a reducing solution storage tank, which is connected to the nozzle at the top of the spray tower through a circulation pump and a pipeline.

[0017] Furthermore, the air inlet of the spray tower is arranged opposite to the nozzle, and the gas outlet direction of the air inlet is the same as that of the nozzle.

[0018] The second technical solution of the present invention is to provide a method for purifying industrial waste gas using ozone and a spray tower, using the above-mentioned VOCs room temperature decomposition system, and the steps include:

[0019] After the ozone and industrial waste gas containing VOCs merge, they enter the drying system to remove water, and then enter the catalytic ozonation system to catalytically decompose VOCs to obtain purified tail gas;

[0020] The purified tail gas enters the spray tower from the air inlet at the bottom of the spray tower, and the ozone in the purified tail gas is converted into oxygen under the action of the reducing solution and the catalyst.

[0021] In the present invention, the oxygen produced by the oxygen generator enters the ozone generator to produce ozone.

[0022] Furthermore, the space velocity of the gas flowing through the catalytic ozonation system is 60,000 to 120,000 h -1 .

[0023] Furthermore, the catalyst filled in the catalytic ozonation system is a manganese-cobalt honeycomb ceramic monolithic catalyst.

[0024] Furthermore, the catalyst filled in the spray tower is a ceramic Raschig ring with a manganese-cobalt catalyst in situ grown on the surface (manganese-cobalt ceramic Raschig ring monolithic catalyst).

[0025] Preferably, the main materials of the ceramic Raschig ring include SiO2 and Al2O3, and the diameter is 6 to 50 mm.

[0026] Preferably, the filling amount of the ceramic Raschig rings in the column of the spray tower is 1 / 2 to 2 / 3 of the column height.

[0027] Furthermore, the reducing solution is pressed into the spray tower from the reducing solution storage tank through a nozzle arranged at the top of the spray tower by a circulation pump.

[0028] Furthermore, the reducing solution includes one of potassium iodide solution, ferrous sulfate solution and sodium thiosulfate solution, and the concentration is 0.1-0.5 mol / L.

[0029] Preferably, the step of purifying industrial waste gas using ozone and a spray tower comprises:

[0030] The oxygen produced by the oxygen generator is introduced into the ozone generator to generate ozone; the ozone is combined with the industrial waste gas containing VOCs and then enters the drying system to remove water, and then enters the catalytic ozone oxidation system filled with a manganese-cobalt honeycomb ceramic integral first-stage catalyst and a catalytic ozone oxidation system with a second-stage catalyst to catalytically decompose VOCs to obtain purified tail gas; the purified tail gas is introduced into the spray tower from the bottom of the spray tower column; the reducing solution is pressed into the spray tower from the reducing solution storage tank by a circulating pump, and is discharged through a nozzle arranged at the top of the spray tower; the purified tail gas is mixed and reacted with the reducing solution and the catalyst loaded in the spray tower column to convert the ozone in the purified tail gas into oxygen, which is discharged from the exhaust port at the top of the spray tower; the reducing solution after the reaction flows into the collection pool at the bottom of the spray tower.

[0031] The present invention discloses the following technical effects:

[0032] The present invention utilizes ozone to remove VOCs in industrial waste gas, and the economic cost is low. Compared with the existing catalytic oxidation technology, the VOCs decomposition system of the present invention can catalytically treat industrial waste gas at room temperature and achieve deep purification, which overcomes the problem that the catalytic reaction in the prior art needs to be carried out at high temperature, and then treats ozone secondary pollution through the ozone spray system, which has the advantages of high efficiency and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0034] Figure 1 It is a schematic diagram of the device of the VOCs decomposition system of the present invention;

[0035] Figure 2 is the room temperature catalytic ozonation decomposition efficiency of toluene;

[0036] Figure 3 Comparison of ozone removal activity curves under different working conditions;

[0037] Figure 4 This is a schematic diagram of the spray tower structure used in the specific implementation scheme of the present application, wherein 1 is the exhaust port, 2 is the nozzle, 3 is the catalyst, 4 is the air inlet, and 5 is the collection tank. DETAILED DESCRIPTION

[0038] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as limiting the present invention, but should be understood as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0039] It should be understood that the terms described in the present invention are only for describing a particular embodiment and are not intended to limit the present invention. In addition, for the numerical range in the present invention, it should be understood that each intermediate value between the upper and lower limits of the scope is also specifically disclosed. The intermediate value in any stated value or stated range, and each smaller range between any other stated value or intermediate value in the described range is also included in the present invention. The upper and lower limits of these smaller ranges can be independently included or excluded in the scope.

[0040] Unless otherwise indicated, all technical and scientific terms used herein have the same meanings as those generally understood by those skilled in the art. Although the present invention describes only preferred methods and materials, any methods and materials similar or equivalent to those described herein may also be used in the implementation or testing of the present invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials associated with the documents. In the event of a conflict with any incorporated document, the content of this specification shall prevail.

[0041] It will be apparent to those skilled in the art that various modifications and variations may be made to the specific embodiments of the present invention description without departing from the scope or spirit of the present invention. Other embodiments derived from the present invention description will be apparent to those skilled in the art. The present invention description and examples are exemplary only.

[0042] The words “include,” “including,” “have,” “contain,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0043] In a specific embodiment of the present invention, the raw materials and reagents used are all commercially available products, wherein the spray tower is filled with a manganese-cobalt ceramic Raschig ring monolithic catalyst, and the manganese-cobalt catalyst can generally be loaded on the surface of the ceramic Raschig ring carrier by an impregnation method, and the molar ratio of manganese element to cobalt element is about 7:10. An exemplary preparation method is given below, and the specific steps are:

[0044] S1, mixing potassium permanganate (concentration in the mixed solution: 0.032 mol / L) and cobalt nitrate hexahydrate (concentration in the mixed solution: 0.048 mol / L) at a manganese-cobalt molar ratio of 7:10 and adding the mixture into water for dissolution by ultrasonic stirring to obtain a mixed solution;

[0045] S2, add the mixed solution into a water tank with a ceramic Raschig ring substrate and stir at 86°C for 4.5 hours, and discharge the solution after it turns light purple;

[0046] S3, repeating steps S1 to S2 for 3 times, placing the ceramic Raschig ring substrate in an oven and drying it at 150°C for 6 hours, then heating it to 500°C at a heating rate of 10°C / min and calcining it for 2.5 hours to obtain a manganese-cobalt ceramic Raschig ring monolithic catalyst precursor;

[0047] S4. Soak the manganese-cobalt ceramic Raschig ring monolithic catalyst in an acetic acid solution (concentration: 0.1 mol / L) for 60 min, blow away the excess solution in the pores, take it out and soak it in a lanthanum nitrate hexahydrate solution (concentration: 0.15 mol / L) for 10 min, blow away the excess solution in the pores, place it in an oven at 150°C and dry it for 6 hours, finally heat it to 500°C at a heating rate of 10°C / min and calcine it at a constant temperature for 2.5 hours to obtain a manganese-cobalt ceramic Raschig ring monolithic catalyst.

[0048] The synthesis method of the manganese-cobalt honeycomb ceramic monolithic catalyst loaded in the first-stage catalytic ozonation system and the second-stage catalytic ozonation system is the same as the above, except that the Raschig ring carrier is replaced by a honeycomb ceramic carrier, wherein the mesh number of the honeycomb ceramic carrier is 200 meshes.

[0049] During the preparation process, the molar ratio of manganese to cobalt is 7:10, so the molar ratio of manganese to cobalt in the prepared manganese-cobalt ceramic Raschig ring monolithic catalyst is about 7:10.

[0050] Manganese-cobalt catalyst is a commonly used heterogeneous catalyst and plays an important role in VOCs (volatile organic compounds) decomposition system. The main components include manganese (Mn) and cobalt (Co) oxides, and the common forms are MnO x, Co3O4, etc. In order to improve the activity and stability of the catalyst, other metal oxides such as cerium (Ce), copper (Cu), iron (Fe), etc. are sometimes added. It usually exists in the form of powder, granules or honeycomb to facilitate full contact with the gas. Manganese cobalt catalysts promote the oxidation reaction between VOCs and oxygen by providing active sites. These active sites can reduce the activation energy of the reaction, thereby accelerating the reaction rate. VOCs molecules are first adsorbed on the surface of the catalyst, and then react with oxygen molecules adsorbed on the surface to produce harmless substances such as CO2 and H2O. Manganese cobalt catalysts can still maintain high activity and stability at high temperatures and are suitable for various high-temperature VOCs treatment processes. Manganese cobalt catalysts have high catalytic activity for a variety of VOCs and can effectively promote their oxidative decomposition. Under long-term operation and high temperature conditions, manganese cobalt catalysts can maintain stable catalytic performance and are not easy to deactivate. Compared with some precious metal catalysts, manganese cobalt catalysts have better tolerance to certain poisons (such as sulfides, chlorides, etc.). Compared with precious metal catalysts, manganese cobalt catalysts have lower costs and better economy. It is widely used in petrochemical, coating, printing, pharmaceutical and other industries to treat exhaust gas containing VOCs. In automobile exhaust purification systems, manganese cobalt catalysts can effectively reduce harmful substances in exhaust gas. In air purifiers, manganese cobalt catalysts can remove indoor VOCs and improve air quality.

[0051] The preparation method is generally co-precipitation, impregnation or sol-gel method.

[0052] Co-precipitation method: A mixed solution of manganese salt and cobalt salt is reacted with an alkaline solution to generate a hydroxide precipitate, which is then washed, dried and calcined to obtain a catalyst.

[0053] Impregnation method: The support (such as alumina, silica, etc.) is impregnated into a precursor solution containing manganese and cobalt, followed by drying and calcination.

[0054] Sol-gel method: A uniform manganese-cobalt composite oxide is prepared by a sol-gel process, and then heat treated to obtain a catalyst.

[0055] In the specific implementation manner of the present invention, unless otherwise specified, the room temperature is 20-30°C.

[0056] The oxygen generator, ozone generator, drying system, catalytic ozonation system and reducing solution storage tank used in the specific implementation of the present invention are all existing equipment, and any equipment in the prior art that can achieve the corresponding functions can be equivalently replaced.

[0057] Oxygen generator: Oxygen generator mainly uses pressure swing adsorption (PSA) technology or membrane separation technology to extract oxygen from the air. PSA technology is achieved by the different adsorption capacities of adsorbents for nitrogen and oxygen in the air under different pressures; while membrane separation technology uses the difference in diffusion speed of gas molecules on a specific material membrane for separation. It provides high-concentration oxygen for the ozone generator, increases ozone production and purity, and thus enhances the oxidation effect of VOCs.

[0058] Ozone generator: uses corona discharge or other methods to convert oxygen into ozone (O3). Ozone is a strong oxidant that can effectively react with VOCs and convert them into harmless substances such as carbon dioxide and water. In the process of VOCs decomposition, ozone produced by ozone generators is one of the key active ingredients.

[0059] Drying system: In the process of VOCs treatment, removing moisture from the exhaust gas is a very important step. The drying system reduces the humidity of the exhaust gas through physical or chemical means to prevent moisture from affecting the efficiency of ozone generation and subsequent catalytic reactions. In addition, drying can also prevent rust and corrosion inside the equipment.

[0060] Catalytic ozonation system: This system combines the effects of a catalyst and ozone to improve the efficiency of VOC decomposition. In the presence of a catalyst, ozone can react with VOCs more effectively to form more stable products. The choice of catalyst is critical to improving reaction rate and selectivity.

[0061] Reducing solution storage tank: In some cases, after the decomposition of VOCs, some intermediates or by-products (such as formaldehyde, formaldehyde, carbon monoxide, etc.) may be produced, which require further treatment to be completely removed. The reducing solution storage tank is filled with specific chemical reagents to capture or neutralize these by-products to ensure that the final emission gas meets environmental standards.

[0062] Catalyst filler: used to further react and decompose a small amount of VOCs intermediates and ozone that are not completely degraded in the previous catalytic ozonation system into CO2 and oxygen.

[0063] Circulation pump: used to transport the reducing solution in the reducing solution storage tank to the nozzle at the top of the spray tower at a certain flow rate.

[0064] The spray tower used in the specific embodiment of the present invention is shown in Figure 4 .

[0065] Example 1

[0066] Method for purifying industrial waste gas VOCs at room temperature using ozone and spray tower, using Figure 1 The VOCs decomposition system shown includes the following steps:

[0067] S1. The oxygen produced by the oxygen generator enters the ozone generator to produce ozone, which is then mixed with the industrial waste gas containing VOCs and enters the drying device for dehydration. After dehydration, it passes through the first-stage catalytic ozone oxidation system and the second-stage catalytic ozone oxidation system filled with manganese-cobalt catalyst (manganese-cobalt honeycomb ceramic monolithic catalyst) in sequence, with an air velocity of 60,000 h -1 , catalytically decompose VOCs in industrial waste gas into carbon dioxide and water;

[0068] S2. The gas after catalytic decomposition in step S1 is introduced into the spray tower through the air inlet at the bottom of the spray tower; the reducing solution (potassium iodide solution, concentration 0.1 mol / L) is pressed into the spray tower from the reducing solution storage tank by a circulating pump, and discharged through the nozzle arranged at the top of the spray tower; the spray tower column is provided with a manganese-cobalt ceramic Raschig ring monolithic catalyst (a ceramic Raschig ring with manganese-cobalt catalyst grown in situ on the surface, wherein the main material of the ceramic Raschig ring is SiO2 and Al2O3, and the diameter is 6 mm) with a height of 1 / 2 of the tower column; the gas after catalytic decomposition is mixed and reacted under the action of the reducing solution and the catalyst, and the remaining ozone in the gas after catalytic decomposition is converted into oxygen, which is harmlessly discharged from the exhaust port at the top of the spray tower; the reducing solution after the reaction flows into the collection pool at the bottom of the spray tower.

[0069] The reaction mechanism of the catalytic decomposition of VOCs in step S1 is shown in Formula 1 and Formula 2:

[0070] O3+active site→O2+O (Formula 1);

[0071] VOCs+O→CO2+H2O (Formula 2).

[0072] The redox reaction mechanism involved in step S2 is shown in Equation 3:

[0073] O3+2KI+H2O→O2+I2+2KOH (Formula 3).

[0074] Example 2

[0075] Method for purifying industrial waste gas at room temperature using ozone and spray tower, using Figure 1 The VOCs decomposition system shown includes the following steps:

[0076] S1. The oxygen produced by the oxygen generator enters the ozone generator to produce ozone, which is then mixed with the industrial waste gas containing VOCs and enters the drying device for dehydration. After dehydration, it passes through the first-stage catalytic ozone oxidation system and the second-stage catalytic ozone oxidation system filled with manganese-cobalt catalyst (manganese-cobalt honeycomb ceramic monolithic catalyst) in sequence, with an air velocity of 60,000 h -1 , catalytically decompose VOCs in industrial waste gas into carbon dioxide and water;

[0077] S2. The gas after catalytic decomposition in step S1 is introduced into the spray tower through the air inlet at the bottom of the spray tower; the reducing solution (potassium iodide solution, concentration 0.2 mol / L) is pressed into the spray tower from the reducing solution storage tank by a circulating pump, and discharged through the nozzle arranged at the top of the spray tower; the spray tower column is provided with a manganese-cobalt ceramic Raschig ring monolithic catalyst (a ceramic Raschig ring with manganese-cobalt catalyst grown in situ on the surface, wherein the main material of the ceramic Raschig ring is SiO2 and Al2O3, and the diameter is 6 mm) with a height of 1 / 2 of the tower column; the gas after catalytic decomposition is mixed and reacted under the action of the reducing solution and the catalyst, and the remaining ozone in the gas after catalytic decomposition is converted into oxygen, which is discharged harmlessly from the exhaust port at the top of the spray tower; the reducing solution after the reaction flows into the collection pool at the bottom of the spray tower.

[0078] Example 3

[0079] Method for purifying industrial waste gas at room temperature using ozone and spray tower, using Figure 1 The VOCs decomposition system shown includes the following steps:

[0080] S1. The oxygen produced by the oxygen generator enters the ozone generator to produce ozone, which is then mixed with the industrial waste gas containing VOCs and enters the drying device for dehydration. After dehydration, it passes through the first-stage catalytic ozone oxidation system and the second-stage catalytic ozone oxidation system filled with manganese-cobalt catalyst (manganese-cobalt honeycomb ceramic monolithic catalyst) in sequence, with an air velocity of 60,000 h -1 , catalytically decompose VOCs in industrial waste gas into carbon dioxide and water;

[0081] S2. The gas after catalytic decomposition in step S1 is introduced into the spray tower through the air inlet at the bottom of the spray tower; the reducing solution (potassium iodide solution, concentration 0.5 mol / L) is pressed into the spray tower from the reducing solution storage tank by a circulating pump, and discharged through the nozzle arranged at the top of the spray tower; the spray tower column is provided with a manganese-cobalt ceramic Raschig ring monolithic catalyst (ceramic Raschig ring with manganese-cobalt catalyst grown in situ on the surface, wherein the main material of the ceramic Raschig ring is SiO2 and Al2O3, and the diameter is 10 mm) with a height of 2 / 3 of the tower column; the gas after catalytic decomposition is mixed and reacted under the action of the reducing solution and the catalyst, and the remaining ozone in the gas after catalytic decomposition is converted into oxygen, which is discharged harmlessly from the exhaust port at the top of the spray tower; the reducing solution after the reaction flows into the collection pool at the bottom of the spray tower.

[0082] Test example

[0083] In order to further verify the role of the VOCs decomposition system of the present invention in solving the problem of ozone secondary pollution, a typical industrial toluene room temperature catalytic ozonation decomposition activity test was selected, and the test conditions were:

[0084] The test gas is toluene, the toluene concentration of the mixed gas is 100ppm, the total gas flow rate is controlled to 4L / min, and the volumetric space velocity is 120,000h -1 , where the oxygen flow rate is 30mL / min, the ozone concentration is 700ppm, the test humidity is 30%; the flow rate of the reducing potassium iodide solution is 200L / h, and the concentration is 0.5mol / L. The gas flow rate and the flow rate of the reducing potassium iodide solution are basically maintained at about 1:1; the test temperature is room temperature (25℃); and the control test is performed without using potassium iodide solution.

[0085] The toluene concentration in the tail gas is collected by gas collection bags and analyzed by gas chromatography. The test results are as follows: Figure 2 As shown; the ozone concentration is detected by an ozone detector, and the results are as follows Figure 2 shown.

[0086] Figure 2 is the room temperature catalytic ozonation decomposition efficiency of toluene. As can be seen from the figure, the room temperature catalytic ozonation decomposition efficiency of toluene can be maintained at 100%.

[0087] Figure 3 Comparison of ozone removal activity curves under different working conditions. Figure 3 It can be seen that the ozone removal efficiency of the spray tower with the addition of reducing potassium iodide solution can reach 100%, and there is no significant decline in stable operation for 170 hours. In the test without the addition of reducing agent potassium iodide, the ozone removal efficiency is 0%, and there is basically no ozone decomposition activity.

[0088] Figure 4 This is a schematic diagram of the spray tower structure used in the specific implementation scheme of the present application, wherein 1 is the exhaust port, 2 is the nozzle, 3 is the catalyst, 4 is the air inlet, and 5 is the collection tank. The specific arrangement of the air inlet and the nozzle can be seen from the figure.

[0089] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0090] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A VOCs room temperature decomposition system for industrial waste gas purification using ozone and a spray tower, characterized in that: include: A mixing system, comprising a mixer, a VOCs waste gas collection system and an ozone generation system; the VOCs waste gas collection system and the ozone generation system are respectively connected to the mixer; A catalytic ozonation system, comprising a drying system, a first-stage catalytic ozonation system and a second-stage catalytic ozonation system connected in sequence; the drying system is connected to the mixer; The ozone spray system comprises a connected spray tower and a reduction system; the bottom of the spray tower is connected to the second-stage catalytic ozonation system through a pipeline; and a nozzle is arranged on the top of the spray tower.

2. The VOCs room temperature decomposition system according to claim 1, characterized in that: The ozone generating system comprises an oxygen concentrator and an ozone generator which are connected in sequence; wherein the ozone generator is connected to the mixer.

3. The VOCs room temperature decomposition system according to claim 1, characterized in that: The VOCs waste gas collection system includes a gas collection hood and a fan.

4. The VOCs room temperature decomposition system according to claim 1, characterized in that: The first-stage catalytic ozonation system and the second-stage catalytic ozonation system are provided with a manganese-cobalt catalyst fixed bed; the column of the spray tower is provided with an ozone and VOCs synergistic decomposition catalyst fixed bed composed of ceramic Raschig rings.

5. The VOCs room temperature decomposition system according to claim 1, characterized in that: The reduction system comprises a reducing solution storage tank, which is connected to the nozzle at the top of the spray tower through a circulating pump and a pipeline.

6. A method for purifying industrial waste gas using ozone and a spray tower, characterized in that: The VOCs room temperature decomposition system according to any one of claims 1 to 5 is used, and the steps include: After the ozone and industrial waste gas containing VOCs merge, they enter the drying system to remove water, and then enter the catalytic ozonation system to catalytically decompose VOCs to obtain purified tail gas; The purified tail gas enters the spray tower from the air inlet at the bottom of the spray tower, and the ozone in the purified tail gas is converted into oxygen under the action of the reducing solution and the catalyst.

7. The method according to claim 6, characterized in that The space velocity of the gas in the catalytic ozonation system is 60000~120000h -1 .

8. The method according to claim 6, characterized in that The catalyst filled in the catalytic ozonation system is a manganese-cobalt honeycomb ceramic monolithic catalyst; and / or, The catalyst filled in the spray tower is a ceramic Raschig ring with a manganese-cobalt catalyst grown in situ on the surface.

9. The method according to claim 8, characterized in that The filling amount of the ceramic Raschig ring in the column of the spray tower is 1 / 2 to 2 / 3 of the column height.

10. The method according to claim 6, characterized in that The reducing solution is pressed into the spray tower from the reducing solution storage tank through a nozzle arranged at the top of the spray tower by a circulation pump; and / or, The reducing solution includes one of potassium iodide solution, ferrous sulfate solution and sodium thiosulfate solution, and the concentration is 0.1-0.5 mol / L.

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