Efficient VOCs (Volatile Organic Compounds) deodorization system for reducing superoxide consumption

Abstract

The invention discloses an efficient VOCs (volatile organic compounds) deodorization system capable of reducing superoxide consumption, and relates to the technical field of waste gas deodorization treatment.The efficient VOCs deodorization system comprises a spraying dust removal unit, an oxidation deodorization unit and a chemical washing tower which are sequentially arranged in the waste gas flowing direction; the spraying dust removal unit comprises a washing dust removal tower and a preparation device, the waste gas flows from the lower part of the washing dust removal tower to the upper part of the washing dust removal tower, the preparation device is communicated with the washing dust removal tower, and the preparation device is used for generating oxygen-enriched ionized water and spraying the oxygen-enriched ionized water downwards from the top of the washing dust removal tower; the oxidation deodorization unit comprises a superoxide generator, a mixer and a roundabout reaction channel, a gas outlet of the superoxide generator is communicated with an inlet of the mixer, the roundabout reaction channel is communicated with an outlet of the mixer, the superoxide generator is used for generating superoxide, and waste gas entering the oxidation deodorization unit is subjected to mixed reaction with the superoxide in the mixer; and the gas enters the roundabout reaction channel to circulate. The kitchen waste deodorization device can efficiently deodorize kitchen waste.

Description

Technical Field

[0001] The present application relates to the technical field of waste gas deodorization treatment, and in particular to an efficient VOCs deodorization system for reducing the usage of superoxide. Background Art

[0002] Kitchen waste is the general term for food waste and kitchen leftovers. Kitchen waste is characterized by high moisture content, high salt content, a large amount of organic components, easy spoilage, and few harmful components. It can be rapidly degraded by microorganisms during the collection, transportation, and treatment processes, causing malodorous pollution.

[0003] The malodorous waste gas generated during the treatment of kitchen waste usually includes garbage putrid waste gas and garbage fermentation waste gas. Among them, the garbage putrid waste gas contains methanethiol and dimethyl disulfide, and the garbage fermentation waste gas contains methanethiol, methyl sulfide, and dimethyl disulfide. These components are all the main components of the VOCs that produce malodorous smells in the waste gas from kitchen waste treatment.

[0004] Currently, there are the following several processes for removing the malodorous VOCs generated during the treatment of kitchen waste: Removed by the method of "heat exchanger heat exchange + chemical washing + biological filtration", but the waste gas discharged from the high-temperature oxygen-controlled fermentation process contains a large amount of dust and grease. After the waste gas passes through the heat exchanger for heat exchange, the waste gas condenses, resulting in the easy adhesion of dust and grease to the heat exchanger, increasing the air resistance and reducing the heat exchange efficiency. Over time, it will also block the equipment and is difficult to clean.

[0005] Removed by the method of "water washing + chemical washing + plasma photocatalysis + biological filtration", but after chemical washing, the waste gas carries a large amount of water vapor, which is likely to affect the plasma photocatalysis, resulting in a high failure rate of plasma tubes and photocatalytic equipment. In addition, the free radicals excited by the plasma photocatalysis have an inactivating effect on the microorganisms in the subsequent biological filtration process, making it easy for the biological filtration process to malfunction.

[0006] Removed by the method of "chemical washing + biological filtration + activated carbon adsorption", but the waste gas discharged from the high-temperature oxygen-controlled fermentation process has a high temperature. One-time chemical washing cannot reduce the temperature to a suitable level for the operation of the biological filtration tower, which is likely to cause the death of microorganisms in the biological filtration tower.

[0007] Removed by the "combustion method", but the combustion method is suitable for treating high-concentration waste gas. For the relatively low concentration in the kitchen waste industry, the investment is huge and the operation and maintenance cost is high, so it is not applicable.

[0008] Therefore, there is an urgent need for a process for efficiently deodorizing the waste gas generated during the treatment of kitchen waste. Summary of the Invention

[0009] In order to solve the defects of the current kitchen waste deodorization process, the present application provides an efficient VOCs deodorization system for reducing the usage of superoxide.

[0010] This application provides an efficient VOCs deodorization system for reducing the amount of ozone used, adopting the following technical solutions: An efficient VOCs deodorization system for reducing the amount of ozone used, comprising a spray dust removal unit, an oxidation deodorization unit, and a chemical scrubbing tower arranged in sequence along the waste gas flow direction. The spray dust removal unit, the oxidation deodorization unit, and the chemical scrubbing tower are all connected through pipelines; The spray dust removal unit includes a scrubbing and dust removal tower and a preparation device. The waste gas flows from the bottom to the top of the scrubbing and dust removal tower. The preparation device is connected to the scrubbing and dust removal tower and is used to generate oxygen-rich ionized water and spray the oxygen-rich ionized water downward from the top of the scrubbing and dust removal tower; The oxidation deodorization unit includes an ozone generator, a mixer, and a circuitous reaction channel. The gas outlet of the ozone generator is connected to the inlet of the mixer, and the circuitous reaction channel is connected to the outlet of the mixer. The ozone generator is used to generate ozone. The waste gas entering the oxidation deodorization unit is mixed and reacted with ozone in the mixer and then enters the circuitous reaction channel for circulation; The chemical scrubbing tower is used to wash and decompose the gas discharged from the oxidation deodorization unit.

[0011] By adopting the above technical solutions, the malodorous waste gas generated during the kitchen waste treatment process enters the scrubbing and dust removal tower. At this time, the preparation device prepares oxygen-rich ionized water and sprays the oxygen-rich ionized water downward in the scrubbing and dust removal tower. The waste gas flows upward from the bottom of the scrubbing and dust removal tower. At this time, the oxygen-rich ionized water and the waste gas form a countercurrent, enabling the oxygen-rich ionized water to fully mix with the waste gas. On the one hand, the dust and grease carried by the waste gas are intercepted in the spray water, and some water-soluble odor components are dissolved in the spray water, removing some odor molecules; on the other hand, the oxygen-rich ionized water and the waste gas undergo an oxidation and decomposition reaction, oxidizing and decomposing the macromolecular organic matter in the waste gas into small molecular substances and further mineralizing, realizing the preliminary treatment of the waste gas.

[0012] After the waste gas passes through the spray dust removal unit, it enters the oxidation deodorization unit. The ozone generator generates ozone, and after the waste gas is fully mixed with ozone in the mixer, it enters the circuitous reaction channel. The waste gas can extend the reaction time with ozone by passing through the circuitous reaction channel, so that the waste gas fully reacts with ozone. Through the reaction with ozone, substances such as amines, hydrogen sulfide, and methyl mercaptan in the waste gas are oxidized into non-toxic and odorless small molecular substances, thus realizing the deodorization treatment of the waste gas.

[0013] Finally, the waste gas enters the chemical scrubbing tower, and the solution in the chemical scrubbing tower conducts the final treatment of the waste gas, finally completing the deodorization treatment of the waste gas.

[0014] Optionally, a packing structure and a spraying assembly are provided in both the washing and dust removal tower and the chemical washing tower. The spraying assembly is arranged above the packing structure. The packing structure has multiple layers, and a spacer is arranged between adjacent two layers of the packing structure. The spacer is connected to the washing and dust removal tower and the chemical washing tower.

[0015] By adopting the above technical solution, the spraying assembly sprays the oxygen-rich ion water downward from the top of the washing and dust removal tower to achieve full mixing of the oxygen-rich ion water and the waste gas; setting multiple layers of packing structures can increase the contact area between the oxygen-rich ion water and the waste gas, enabling the waste gas to fully react with the oxygen-rich ion water in the washing and dust removal tower and improving the deodorization efficiency; the spacer can support each layer of the packing structure.

[0016] Optionally, the packing structure in the washing and dust removal tower includes a number of Pall rings, and the packing structure in the chemical washing tower includes a number of PP multi-faceted hollow balls; A plurality of openable and closable discharge ports are provided on the side walls of both the washing and dust removal tower and the chemical washing tower, and the packing structure can be taken out from the discharge ports.

[0017] By adopting the above technical solution, both the Pall rings and the PP multi-faceted hollow balls can increase the contact area between the spraying liquid and the waste gas and enable the waste gas to fully mix and react with the spraying liquid, making the deodorization effect of the waste gas better; among them, using PP multi-faceted hollow balls for the packing structure in the chemical washing tower can prevent the packing structure from easily reacting with the spraying liquid in the chemical washing tower and reduce the corrosion of the spraying liquid on the packing structure; Since grease or dirt is likely to accumulate and adhere to the surface of the packing structure, the discharge ports are provided so that the staff can regularly take out a number of Pall rings from the washing and dust removal tower or take out a number of PP multi-faceted hollow balls from the chemical washing tower for cleaning and maintenance, thereby improving the deodorization effect of the washing and dust removal tower and the chemical washing tower.

[0018] Optionally, a liquid redistributor is fixed to the bottom of the spacer.

[0019] By adopting the above technical solution, since the spraying liquid is likely to gather and flow down after passing through one layer of the packing structure, resulting in the spraying liquid not being evenly sprayed into the lower layer of the packing structure, setting the liquid redistributor can collect the spraying liquid discharged from the upper layer of the packing structure and evenly discharge it into the lower layer of the packing structure, enabling the waste gas entering each layer of the packing structure to fully mix and react with the spraying liquid, and thus making the treatment efficiency of the washing and dust removal tower and the chemical washing tower higher.

[0020] Optionally, the inlet of the tortuous reaction channel is arranged below the outlet of the tortuous reaction channel, and the bottom wall of the tortuous reaction channel is provided with a slope surface inclined from the outlet height plane towards the inlet height plane.

[0021] By adopting the above technical solution, the humidity of the waste gas is relatively high after passing through the washing and dust removal tower. When it reacts fully with superoxide in the tortuous reaction channel, sewage will be generated. A slope surface is provided on the bottom wall of the tortuous reaction channel so that the sewage flows along the tortuous reaction channel and converges to the bottom of the tortuous reaction channel for discharge.

[0022] Optionally, the tortuous reaction channel includes a circulation chamber, and a plurality of spaced deflector plates are detachably installed in the circulation chamber, and the deflector plates are inclined. The deflector plates include a plurality of first deflector plates and a plurality of second deflector plates arranged alternately, and the circulation chamber includes opposite first side walls and second side walls. One end of the first deflector plate is connected to the first side wall, and the other end is spaced from the second side wall. One end of the second deflector plate is connected to the second side wall, and the other end is spaced from the first side wall.

[0023] By adopting the above technical solution, the installation method of the plurality of first deflector plates and the plurality of second deflector plates forms a tortuous circulation channel for the waste gas in the circulation chamber, making the circulation path of the waste gas longer, so that the superoxide and the waste gas can react fully. At the same time, the deflector plates are detachably installed in the circulation chamber, so that the deflector plates can be removed and cleaned regularly, thereby maintaining the cleanliness of the deflector plates.

[0024] Optionally, an exhaust pipe is connected to the exhaust port of the chemical scrubbing tower. The exhaust pipe is used to discharge the treated waste gas, and a superoxide detector is provided at the exhaust pipe.

[0025] By adopting the above technical solution, since the discharge of superoxide molecules into the atmosphere will also cause pollution, a superoxide detector is provided at the exhaust pipe, which can detect the amount of superoxide in the discharged waste gas, and then adjust the generation amount of superoxide according to the excess amount of superoxide, thereby reducing the operating cost and reducing the secondary pollution of superoxide to the atmosphere.

[0026] Optionally, a cooling unit is further provided between the spray dust removal unit and the oxidation deodorization unit, and the cooling unit is simultaneously connected to the spray dust removal unit and the oxidation deodorization unit through pipelines.

[0027] By adopting the above technical solution, the temperature of the waste gas is still relatively high after passing through the washing and dust removal tower. To improve the deodorization effect in the subsequent steps, the waste gas needs to be cooled, and the cooling unit can cool the incoming waste gas.

[0028] Optionally, the cooling unit includes a plurality of cooling channels, and one of the cooling channels is connected to the superoxide generator, and the aqueous solution for generating superoxide flows into the superoxide generator through the cooling channel.

[0029] By adopting the above technical solution, the waste gas exchanges heat with the aqueous solution in the cooling channel, thereby achieving temperature reduction. After using the aqueous solution that generates superoxide to cool the waste gas, the aqueous solution is then discharged into the superoxide generator for the preparation of superoxide, enabling the aqueous solution used to generate superoxide to be reused multiple times and being more energy-efficient.

[0030] Optionally, the spraying liquid in the chemical scrubbing tower includes an alkaline solution and a sodium hypochlorite solution.

[0031] By adopting the above technical solution, the chemical scrubbing tower circulates and convects with the waste gas through the alkaline solution plus the sodium hypochlorite solution, realizing further absorption and oxidation of the VOCs components in the waste gas. And the residual superoxide gas molecules have further enhanced oxidation ability under alkaline conditions and can react with the VOCs components in the waste gas again.

[0032] In summary, the present application includes at least one of the following beneficial effects: 1. The present application first fully reacts the oxygen-rich ionic water with the waste gas to preliminarily wash and oxidize the waste gas; then fully reacts the superoxide with the waste gas to fully decompose and oxidize the waste gas into colorless and odorless small molecules; finally, the chemical scrubbing tower conducts final treatment on the waste gas to achieve treatment of the odor components in the waste gas generated during the treatment process of kitchen waste and reduce the emission of odors. 2. The present application sets a multi-layer packing structure in the dust removal scrubbing tower and the chemical scrubbing tower, and introduces the waste gas from below and sprays the spraying liquid from above, which can realize the convection of the spraying liquid and the waste gas, and further enable the waste gas and the spraying liquid to be fully mixed and react, improving the treatment efficiency of the waste gas. 3. Setting a superoxide detector can detect the amount of superoxide contained in the waste gas discharged into the atmosphere, and then adjust the generation amount of superoxide in real time. On the one hand, it reduces the secondary pollution of the atmosphere by superoxide, and on the other hand, it can reduce the operating cost. 4. Set a meandering reaction channel, and set a slope at the bottom of the meandering reaction channel, so that the waste gas can fully react with the superoxide in the meandering reaction channel, and at the same time, the wastewater generated by the reaction can be collected along the meandering reaction channel to the bottom of the meandering reaction channel and discharged. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is the top view of the deodorization system of the present application; Figure 2 is the front sectional view of the deodorization system of the present application; Figure 3 is the schematic diagram of the bending path of the first embodiment of the meandering reaction channel of the present application.

[0034] Description of reference numerals: 1. Spray dust removal unit; 11. Washing dust removal tower; 2. Oxidation deodorization unit; 21. Ozone generator; 22. Mixer; 23. Circuitous reaction channel; 231. Flow chamber; 232. First deflector; 233. Second deflector; 234. First side wall; 235. Second side wall; 3. Chemical scrubbing tower; 31. Packing structure; 32. Spray assembly; 33. Isolator; 34. Discharge port; 35. Liquid redistributor; 4. Exhaust stack; 5. Cooling and temperature reduction unit; 51. Cooling box; 52. Cooling channel. Detailed implementation manners

[0035] The following further describes the present application in detail with reference to the Figures 1 - 3 accompanying drawings.

[0036] A highly efficient VOCs deodorization system for reducing the ozone dosage disclosed in the embodiments of the present application is referred to Figure 1 and Figure 2 . A highly efficient VOCs deodorization system for reducing the ozone dosage includes a spray dust removal unit 1, a cooling and temperature reduction unit 5, an oxidation deodorization unit 2, and a chemical scrubbing tower 3 arranged in sequence, and the spray dust removal unit

[0037] 1, the cooling and temperature reduction unit 5, the oxidation deodorization unit 2, and the chemical scrubbing tower 3 are all connected through pipelines. Figure 1 and Figure 2 . The mixed malodorous exhaust gas after the putrefaction and high-temperature fermentation of kitchen waste is collected in a relatively sealed collection system, and is transported to the spray dust removal unit 1 for deodorization treatment through a collection air inlet, a conveying air duct, and a fan. Among them, a negative pressure fan is used for the fan, and an axial flow fan can be used to compensate for the wind pressure loss when the pipeline is long, so as to keep the deodorization system of the present application in a negative pressure state, so as to reduce the overflow of malodorous exhaust gas and pollute the air.

[0038] Refer to Figure 1 and Figure 2 . The spray dust removal unit 1 includes a washing dust removal tower 11 and a preparation device. The preparation device is used to generate oxygen-rich ion water. A spray assembly 32 and multiple layers of packing structures 31 are arranged in the washing dust removal tower 11. The spray assembly 32 is arranged at the top of the washing dust removal tower 11, and the preparation device is connected to the spray assembly 32, so that the oxygen-rich ion water can be sprayed into the washing dust removal tower 11 through the spray assembly 32. The spray assembly 32 includes a plurality of spray heads. The spray heads can specifically be high-pressure atomizing spray heads. The plurality of spray heads can be evenly arranged in a circle around the washing dust removal tower 11, and at the same time, spray heads can also be installed in the middle of the washing dust removal tower 11 to achieve uniform and sufficient spraying in each area of the washing dust removal tower 11. The exhaust gas enters the washing dust removal tower 11 from the bottom of the washing dust removal tower 11 and flows upward, thereby realizing the convection of the exhaust gas and the oxygen-rich ion water.

[0039] Refer to Figure 1 andFigure 2 The multi-layer packing structure 31 is arranged in layers along the height direction of the washing and dust-removing tower 11, and a separator 33 is arranged between adjacent two layers of packing structures 31. Each layer of packing structure 31 is supported by the separator 33. The separator 33 is fixed in the washing and dust-removing tower 11, and the separator 33 can specifically be a mesh sheet. The packing structure 31 arranged in the washing and dust-removing tower 11 includes a number of Pall rings stacked on the separator 33. Through the packing structure 31, the contact area between the oxygen-rich ion water and the waste gas can be increased, thereby improving the reaction efficiency. Since the Pall ring has the advantages of large throughput, small resistance, high separation efficiency and large operating flexibility, under the same pressure reduction, the processing capacity is more than that of the packing with other structures. Therefore, the packing structure 31 is selected as the Pall ring.

[0040] Refer to Figure 2 When the waste gas passes through the washing and dust-removing tower 11, the grease and dust carried in the waste gas are easily deposited on the surface of the packing structure 31. Therefore, a plurality of openable and closable discharge ports 34 are provided on the side wall of the washing and dust-removing tower 11. Specifically, one or more discharge ports 34 are provided above each separator 33. Through the discharge ports 34, a plurality of Pall rings can be taken out for unified cleaning and maintenance.

[0041] Refer to Figure 2 At the bottom of each separator 33, a liquid redistributor 35 is further fixed. The liquid redistributor 35 covers the cross section of the washing and dust-removing tower 11. The liquid redistributor 35 can purchase a common liquid redistributor on the market. The structure of the liquid redistributor 35 will not be elaborated here. By arranging the liquid redistributor 35, the oxygen-rich ion water can be evenly sprayed into each layer of packing structure 31, so that the oxygen-rich ion water can wash and redox the waste gas of each layer of packing structure 31 in the washing and dust-removing tower 11.

[0042] Refer to Figure 1 and Figure 2 When the washing and dust-removing tower 11 treats the waste gas, a large amount of active oxygen generated by the oxygen-rich ion atomizer in the preparation device dissolves in water to form oxygen-rich ion water. The oxygen-rich ion water is evenly sprayed into the washing and dust-removing tower 11 through the spraying assembly 32 to wash the waste gas entering the washing and dust-removing tower 11, so that the dust and grease carried in the high-temperature waste gas are intercepted in the oxygen-rich ion water, and some of the malodorous components in the waste gas can also be preliminarily removed.

[0043] Refer to Figure 1 and Figure 2, The oxygen-rich ion water is sprayed from top to bottom in the washing and dedusting tower 11 through the spraying system. The waste gas enters from the bottom of the washing and dedusting tower 11 and flows upward, forming a countercurrent with the oxygen-rich ion water, so as to achieve the full mixing and reaction of the waste gas and the oxygen-rich ion water. Both the aqueous phase and the gas phase of the oxygen-rich ion water participate in the oxidation and decomposition process of the odor components in the waste gas, which improves the removal rate and efficiency of VOCs in the waste gas. Part of the water-soluble odor components will dissolve in the oxygen-rich ion water to remove the odor molecules; part of the odor components react with the gas phase formed by the atomization of the oxygen-rich ion water. The oxygen-rich ions dissolved in the aqueous solution are partially ionized to generate hydroxyl radicals. The oxidation ability of hydroxyl radicals is stronger than that of oxygen-rich ions, and they can oxidize and decompose the odor components. After the oxidation and decomposition reaction, the macromolecular organic matter in the odor components is oxidized and decomposed into small molecule substances and further mineralized. Some small molecule organic matter and inorganic matter that are difficult to remove by simple chemical methods are also removed by oxidation and decomposition or converted into easily degradable components.

[0044] Refer to Figure 1 and Figure 2 , After the preliminary treatment of the waste gas by the washing and dedusting tower 11, it enters the cooling unit 5. The waste gas can be cooled after passing through the washing and dedusting tower 11, but it is difficult to reach the specified temperature for entering the oxidation deodorization unit 2 only through the washing and dedusting tower 11. Therefore, the waste gas needs to be cooled again by the cooling unit 5.

[0045] Refer to Figure 2 , The cooling unit 5 can be various structures that can cool the waste gas. This application example provides one preferred example. The cooling unit 5 includes a cooling box 51, and a plurality of cooling channels 52 are arranged in the cooling box 51, and one of the cooling channels 52 is communicated with the oxidation deodorization unit 2. By introducing flowing cooling water into the cooling channel 52, the waste gas passing through the cooling unit 5 can exchange heat with the cooling water, so as to achieve the cooling of the waste gas.

[0046] Refer to Figure 1 and Figure 2, after the waste gas is cooled by the cooling and temperature reduction unit 5, it is discharged into the oxidation and deodorization unit 2. The oxidation and deodorization unit 2 includes an ozone generator 21, a mixer 22 and a tortuous reaction channel 23. The ozone generator 21 generates ozone by the dielectric barrier discharge method, which is a prior art and will not be elaborated here. The mixer 22 can specifically be a jet mixer 22. The air chamber in the mixer 22 forms a negative pressure under the action of a high-speed air flow, sucking the ozone generated by the ozone generator 21 into the mixer 22 through a pipeline. At the same time, the exhaust port of the cooling channel 52 is communicated with the mixer 22, so that the waste gas enters the mixer 22. The ozone and the waste gas are mixed in the mixer 22 and then discharged into the tortuous reaction channel 23. The ozone and the odor molecules in the waste gas undergo an oxidation reaction in the tortuous reaction channel 23, oxidizing components such as amine, hydrogen sulfide, and methyl mercaptan in the waste gas to generate non-toxic and odorless small molecule substances.

[0047] Refer to Figure 1 and Figure 2 , the above-mentioned cooling channel 52 communicated with the oxidation and deodorization unit 2 is specifically communicated with the ozone generator 21, and is used to supply the aqueous solution required for the dielectric barrier discharge method to the ozone generator 21, so that the water in the cooling channel 52 can be first used for cooling the waste gas and then for the ozone generator 21 to prepare ozone, realizing the multiple use of the aqueous solution and being more energy-saving.

[0048] Refer to Figure 1 and Figure 2 , the tortuous reaction channel 23 is provided to increase the oxidation reaction time of the ozone and the waste gas, so that the ozone and the waste gas can fully react in the tortuous reaction channel 23. The ozone and the waste gas enter from the bottom of the tortuous reaction channel 23, flow along the tortuous reaction channel 23 and are discharged from the top.

[0049] Refer to Figure 1 and Figure 3 , in this application, two implementation examples of the setting of the tortuous reaction channel 23 are provided. In the first embodiment, the tortuous reaction channel 23 includes a continuous pipeline, which is bent back and forth from bottom to top into multiple layers, and the pipeline is also bent back and forth in each layer to form the tortuous reaction channel 23. The bottom wall of the pipeline is provided with a slope surface inclined from the discharge port height surface to the intake port height surface. The slope surface is not shown in Figure 3 , so that the sewage generated during the reaction of the waste gas and the ozone can flow down along the bottom wall of the tortuous reaction channel 23 and be collected at the bottom of the tortuous reaction channel 23 for centralized discharge.

[0050] Refer to Figure 2, in the second embodiment, the detour reaction channel 23 includes a circulation chamber 231. Multiple flow guiding plates are detachably installed in the circulation chamber 231. Specifically, one side wall of the circulation chamber 231 is defined as the first side wall 234, and the side wall opposite to the first side wall 234 is defined as the second side wall 235. Exhaust gas and superoxide enter the circulation chamber 231 from the bottom of the first side wall 234 and are discharged from the top of the second side wall 235. The flow guiding plates include multiple first flow guiding plates 232 and multiple second flow guiding plates 233. Multiple plugging holes are spaced apart on both the first side wall 234 and the second side wall 235. Multiple first flow guiding plates 232 are plugged into the circulation chamber 231 one by one through the plugging holes on the first side wall 234, and the connection parts are sealed. The free ends of the first flow guiding plates 232 are spaced from the second side wall 235. Multiple second flow guiding plates 233 are plugged into the circulation chamber 231 one by one through the plugging holes on the second side wall 235, and the connection parts are sealed. The free ends of the second flow guiding plates 233 are spaced from the first side wall 234. The first flow guiding plates 232 and the second flow guiding plates 233 are alternately and spacedly arranged, so as to form a detour exhaust gas circulation channel in the circulation chamber 231 through the first flow guiding plates 232 and the second flow guiding plates 233. Plugging and connecting the flow guiding plates to the circulation chamber 231 can realize the detachable of the flow guiding plates, making the flow guiding plates convenient for cleaning and maintenance. In addition, each flow guiding plate inclines towards the bottom wall of the circulation chamber 231, so that the waste water generated by the reaction of the exhaust gas and the superoxide can flow down along the flow guiding plates and converge to be discharged from the bottom of the circulation chamber 231.

[0051] Refer to Figure 1 and Figure 2 , the exhaust gas discharged after being treated by the oxidation deodorization unit 2 enters the chemical scrubbing tower 3. The structure of the chemical scrubbing tower 3 is the same as that of the washing and dust removal tower 11, and will not be elaborated here too much. The difference between the chemical scrubbing tower 3 and the washing and dust removal tower 11 is that the packing structure 31 in the chemical scrubbing tower 3 adopts PP multi-faceted hollow balls to reduce the corrosion of the packing structure 31 by the spraying liquid in the chemical scrubbing tower. The arrangement of the nozzles in the chemical scrubbing tower 3 should ensure that each area in the chemical scrubbing tower 3 is completely and evenly covered by the spraying liquid.

[0052] Refer to Figure 2 , the spraying liquid in the chemical scrubbing tower 3 includes an alkaline solution and a sodium hypochlorite solution. The pH value of the alkaline solution is in the range of 9-11, and specifically can be sodium hydroxide or sodium carbonate. Through the convective washing of the spraying liquid and the exhaust gas, the VOCs components in the exhaust gas are further absorbed, neutralized and oxidized. At the same time, the residual superoxide gas molecules are further enhanced in oxidation ability under alkaline conditions. After the free superoxide molecules pass through the two reaction towers, they are all converted into hydroxyl radicals, which not only greatly increases the reaction time of the superoxide and the malodorous gas, but also reduces the situation that the superoxide molecules remain in the discharged gas and cause secondary pollution.

[0053] Refer to Figure 1 andFigure 2 , an exhaust pipe 4 is connected to the exhaust port of the chemical scrubbing tower 3. The waste gas is treated after passing through the chemical scrubbing tower 3 and discharged from the exhaust pipe 4 of the deodorization system of the present application. An ozone detector is provided at the exhaust pipe 4 to detect the ozone content of the discharged gas through the ozone detector. Since the total amount and component content of the waste gas generated during the high-temperature aerobic fermentation stage of food waste are not the same, installing an ozone detector at the exhaust pipe 4 can adjust the ozone generation amount according to the excess ozone detected by the ozone detector, thereby reducing the operating cost and reducing the secondary pollution of the atmosphere caused by ozone discharge.

[0054] The implementation principle of the high-efficiency VOCs deodorization system for reducing ozone usage in the embodiments of the present application is as follows: This deodorization system adopts a negative-pressure deodorization process of "oxygen-rich ion water washing and dust removal + cooling and temperature reduction + ozone oxidation + chemical washing", which solves the problem of unqualified VOCs emissions in the deodorization system of the food waste fermentation process, and has low overall equipment investment cost, low operating cost, high removal efficiency, and complete safeguard measures.

[0055] The reaction between oxygen-rich ion water and malodorous gas increases the heterogeneous reaction interface, greatly increasing the removal rate and efficiency of VOCs. The design of the two-stage reaction tower also effectively increases the ozone reaction time. The free ozone molecules coming out of the washing and dust removal tower 11 are completely converted into hydroxyl radicals under the alkaline conditions of the chemical scrubbing tower 3, reducing the ozone residue in the subsequent waste gas and reducing secondary pollution.

[0056] Ozone has extremely strong oxidizing ability. The main components causing odors and putrefaction in nature are amines R3N, hydrogen sulfide H2S, methyl mercaptan CH3SH, etc. Using the strong oxidizing property of ozone, the above components can be oxidized and decomposed, and the above components can be oxidized and decomposed into non-toxic and odorless small molecule substances, thereby achieving the effect of deodorization.

[0057] The reaction molecular formulas of ozone with the above components are as follows: R3N + O3 → R3N - O + O2 H2O + O3 → S + H2O + O2 → SO2 + H2O CH3SH + O3 → [CH3 - S - S - CH3] - - → CH3SO3H + O2 Ozone first oxidizes and decomposes the macromolecular organic matter in the waste gas into small molecule substances. Some small molecule organic matter and inorganic matter that are difficult to remove by simple chemical methods are also removed by oxidation and decomposition or converted into easily degradable components, which is more conducive to the removal of the remaining VOCs and their oxidation products in the chemical scrubbing tower 3. This system realizes strict control of the ozone dosage through an ozone detector, which can not only reduce the waste of ozone during operation, reduce the operating cost, but also reduce the ozone emissions and reduce the pollution of the atmosphere by ozone.

[0058] The principle of treating VOCs with sodium hypochlorite solution is to utilize the oxidation reaction of hypochlorite ions on VOCs. Sodium hypochlorite will release hypochlorite ions in water. This ion has strong oxidizing properties and can react with carbon atoms in VOCs, destroying their chemical structures, thereby converting them into harmless substances. Treating VOCs with sodium hypochlorite usually needs to be carried out under alkaline conditions to improve the reaction effect.

[0059] The above are all preferred embodiments of this application. The protection scope of this application is not limited by this. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. An efficient VOCs deodorization system for reducing the usage of superoxide, characterized in that: It includes a spray dust removal unit (1), an oxidation deodorization unit (2), and a chemical scrubbing tower (3) arranged in sequence along the waste gas flow direction. The spray dust removal unit (1), the oxidation deodorization unit (2), and the chemical scrubbing tower (3) are all connected through pipelines; The spray dust removal unit (1) includes a washing and dust removal tower (11) and a preparation device. The waste gas flows from the bottom of the washing and dust removal tower (11) towards the top of the washing and dust removal tower (11). The preparation device is connected to the washing and dust removal tower (11), and the preparation device is used to generate oxygen-rich ion water and spray the oxygen-rich ion water downward from the top of the washing and dust removal tower (11); The oxidation deodorization unit (2) includes a superoxide generator (21), a mixer (22), and a tortuous reaction channel (23). The gas outlet of the superoxide generator (21) is connected to the inlet of the mixer (22), and the tortuous reaction channel (23) is connected to the outlet of the mixer (22). The superoxide generator (21) is used to generate superoxide. The waste gas entering the oxidation deodorization unit (2) is mixed and reacted with superoxide in the mixer (22) and then flows into the tortuous reaction channel (23); The chemical scrubbing tower (3) is used to wash and decompose the gas discharged from the oxidation deodorization unit (2).

2. The high-efficiency VOC deodorization system for reducing the usage amount of superoxide according to claim 1, wherein: Packing structures (31) and spray components (32) are both arranged in the washing and dust removal tower (11) and the chemical scrubbing tower (3). The spray components (32) are arranged above the packing structures (31). The packing structures (31) are provided with multiple layers, and a separator (33) is arranged between adjacent two layers of the packing structures (31). The separator (33) is connected to the washing and dust removal tower (11) and the chemical scrubbing tower (3).

3. The highly efficient VOCs deodorization system for reducing the amount of superoxide used according to claim 2, characterized in that: The packing structure (31) in the washing and dust removal tower (11) includes a number of Pall rings, and the packing structure (31) in the chemical scrubbing tower (3) includes a number of PP multi-faceted hollow balls; A plurality of openable and closable discharge ports (34) are opened on the side walls of the washing and dust removal tower (11) and the chemical scrubbing tower (3), and the packing structure (31) can be taken out from the discharge ports (34).

4. The high-efficiency VOCs deodorization system for reducing the amount of superoxide used according to claim 2, characterized in that: A liquid redistributor (35) is fixed at the bottom of the separator (33).

5. An efficient VOC deodorization system for reducing the amount of superoxide used according to claim 1, characterized in that: The inlet of the tortuous reaction channel (23) is arranged below the outlet of the tortuous reaction channel (23), and the bottom wall of the tortuous reaction channel (23) is provided with a slope surface inclined from the outlet height surface towards the inlet height surface; 6. The highly efficient VOC deodorization system for reducing the amount of superoxide used according to claim 5, characterized in that: The tortuous reaction channel (23) includes a flow-through chamber (231), and a plurality of spaced baffle plates are detachably installed in the flow-through chamber (231). The baffle plates are inclined; The baffle plates include a plurality of first baffle plates (232) and a plurality of second baffle plates (233) arranged alternately. The flow-through chamber (231) includes opposite first side walls (234) and second side walls (235); One end of the first baffle plate (232) is connected to the first side wall (234), and the other end is spaced from the second side wall (235); One end of the second guide plate (233) is connected to the second side wall (235), and the other end is spaced apart from the first side wall (234).

7. An efficient VOCs deodorization system for reducing the amount of superoxide used according to claim 1, characterized in that: An exhaust pipe (4) is connected to the exhaust port of the chemical scrubbing tower (3), and the exhaust pipe (4) is used to discharge the treated waste gas. An over-oxygen detector is provided at the exhaust pipe (4).

8. An efficient VOCs deodorization system for reducing the amount of superoxide used according to claim 1, characterized in that: A cooling unit (5) is further provided between the spray dust removal unit (1) and the oxidation deodorization unit (2), and the cooling unit (5) is simultaneously connected to the spray dust removal unit (1) and the oxidation deodorization unit (2) through a pipeline.

9. An efficient VOCs deodorization system for reducing the amount of superoxide used according to claim 8, characterized in that: The cooling unit (5) comprises a plurality of cooling channels (52), and one of the cooling channels (52) is in communication with the superoxide generator (21), and an aqueous solution for generating superoxide flows into the superoxide generator (21) through the cooling channel (52).

10. The high-efficiency VOC deodorization system for reducing the amount of superoxide used according to claim 2, characterized in that: The spray liquid in the chemical washing tower (3) includes an alkaline solution and a sodium hypochlorite solution.

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