Device for online biodegradation of VOCs (Volatile Organic Compounds)

Abstract

The utility model relates to a device for on-line biodegradation of VOCs (volatile organic compounds). The device comprises a cyclone tower, a gas-water separator and a biological enzyme reaction box which are connected in sequence, a cyclone is arranged at the bottom of the cyclone tower, an environment-friendly filler adsorption layer is arranged at the top of the cyclone tower, and an environment-friendly filler adsorption material is placed on the environment-friendly filler adsorption layer; a composite sprayer is arranged below the environment-friendly filler adsorption layer, is connected with a biological bacterium circulating water tank through a circulating pump, and can spray out biological bacterium liquid to degrade VOCs waste gas; the gas-water separator comprises a primary water absorption area formed by filter cotton and a deep water absorption area formed by a plurality of inorganic light porous fillers, and a biological enzyme taking activated carbon as a carrier is arranged in the biological enzyme reaction box. The plurality of sets of biological enzyme reaction boxes are arranged in parallel; the number of the cyclone towers can be multiple, and the multiple cyclone towers are installed in series. The device solves the problems that gas and liquid are difficult to mix and waste gas is difficult to capture and degrade, is safe and environment-friendly, low in energy consumption and low in cost, and can meet the requirements of continuous production and online degradation of VOCs of enterprises.

Description

Technical Field

[0001] The utility model relates to the technical field of VOCs waste gas treatment, in particular to an online biodegradation device for VOCs. Background Art

[0002] The exhaust gas from the painting workshop is mainly composed of organic solvents contained in the paint and decomposition products of the coating during spraying and drying, collectively known as volatile organic compounds (VOCs). The main components are benzene, toluene and xylene. These components are harmful to human health and living environment and have a bad odor. If people inhale low-concentration organic waste gas for a long time, it will cause chronic respiratory diseases such as coughing, chest tightness, asthma and even emphysema. This is currently recognized as a strong carcinogen.

[0003] The main treatment technologies for online treatment of VOCs are: regenerative high-temperature oxidation furnace (RTO) and regenerative catalytic oxidation furnace (RCO). RTO has high one-time investment cost, high treatment temperature (800-1100℃), high energy consumption, and requires a large amount of natural gas. It is not suitable for treating high-concentration organic waste gas. It has many moving parts and requires frequent maintenance, and has high operation and maintenance costs. RCO is only suitable for the treatment of organic waste gas containing low-boiling organic components and low ash content. It is not suitable for the treatment of waste gas containing sticky substances such as oil smoke. The treatment temperature is also high (300-600℃), and the core unit catalyst (precious metal) is easily poisoned and ineffective. In order to overcome the defects of RTO and RCO in the treatment of VOCs waste gas, such as high energy consumption and easy poisoning of catalysts, low-energy consumption biofilm method, photodecomposition method, ozone decomposition method, biodegradation method, etc. have been developed.

[0004] The current biodegradation VOCs process and device are mainly used for intermittent treatment, that is, first collect the gas, and then fully fuse the gas and biological bacteria in a closed space. There is no process and device for online continuous treatment of VOCs using biodegradation. At present, some biological methods for degrading VOCs cannot meet the needs of coating waste gas treatment. They basically use organisms as auxiliary, or need to collect waste gas before treatment, which cannot meet the needs of enterprises for continuous production and online degradation of VOCs. For example, the device in patent 202320759284.7 can only handle very small air volumes. The method and device for treating difficult-to-degrade organic waste gas by combining low-temperature plasma with biology first need to collect gas and then degrade it; secondly, the plasma equipment requires a high-voltage power supply, which is dangerous; finally, the main function of the biological trickling filter, filter tower or washing tower used in this technology is to remove dust and deodorize, and cannot play a degradation role. Utility Model Content

[0005] In order to solve the shortcomings of the current online VOCs treatment technology, the purpose of the utility model is to provide an online biodegradation VOCs device that can continuously degrade and treat VOCs online and meet the needs of enterprises for continuous production of online VOCs degradation.

[0006] The technical solution of the utility model is as follows:

[0007] A device for online biodegradation of VOCs, comprising a cyclone tower, a gas-water separator and a biological enzyme reaction box connected in sequence; the cyclone tower causes VOCs waste gas to perform high-speed rotational motion, and in this motion state, the VOCs waste gas is fully mixed and reacted with a biological bacterial liquid sprayed in the cyclone tower to obtain a first purified gas that degrades and removes most of the VOCs; the gas-water separator is used to remove moisture and impurities from the first purified gas to obtain a second purified gas; the biological enzyme reaction box is provided with a biological enzyme with activated carbon as a carrier, which is used to decompose and purify the second purified gas through the biological enzyme to obtain a third purified gas that can meet emission standards.

[0008] Preferably, a cyclone is provided at the bottom of the cyclone tower, and an environmentally friendly filler adsorption layer is provided at the top of the tower, on which an environmentally friendly filler adsorption material is placed; a composite sprayer is provided below the environmentally friendly filler adsorption layer, which is connected to the biological bacteria circulating water tank through a circulating pump and can spray out biological bacteria liquid; wherein, the cyclone is used to make the VOCs waste gas entering the cyclone tower rotate at a high speed, the environmentally friendly filler adsorption layer is used to place the environmentally friendly filler adsorption material, and the composite sprayer is used to spray out the biological bacteria liquid, a part of the biological bacteria liquid is a continuously flowing liquid, and the other part is a liquid attached to the environmentally friendly filler adsorption material.

[0009] Alternatively, preferably, a rotating packing layer is provided in the cyclone tower, and the rotating packing layer is used to place environmentally friendly packing adsorption materials; a liquid distributor is provided in the center of the rotating packing layer, which is connected to the biological bacteria circulating water tank through a circulating pump and can spray out biological bacteria liquid, a part of which is a continuously flowing liquid, and the other part is a liquid attached to the environmentally friendly packing adsorption material.

[0010] Preferably, the gas-water separator includes a primary water absorption zone composed of filter cotton and a deep water absorption zone composed of multiple inorganic lightweight porous fillers. The first purified gas first passes through the filter cotton to initially remove moisture and impurities, and then passes through multiple inorganic lightweight porous fillers to completely remove moisture and impurities to obtain the second purified gas.

[0011] Preferably, the bio-enzyme reaction boxes are in multiple sets, and the multiple sets of bio-enzyme reaction boxes are installed in parallel.

[0012] Preferably, there are multiple cyclone towers, which are installed in series.

[0013] Preferably, the environmentally friendly filler adsorption material or inorganic lightweight porous filler is an irregular particle with a diameter of 5-50 mm, and the particle is a microporous structure with a porosity of 50% to 90% and a specific surface area of ​​more than 2m 2 More preferably, the particle specific gravity is less than or equal to 0.3KG / m 3 The microporous structures are mostly through holes, and the minimum pore size is as fine as micron level.

[0014] The microbial liquid in the cyclone tower can be fully mixed with the VOC waste gas, and the liquid-gas contact time reaches more than 3S. Under the efficient solubilization effect of the microbial liquid on organic gas, the microorganisms can capture organic gas to the greatest extent, making VOC S Entering the microbial liquid phase, VOCs entering the microbial liquid phase S Microorganisms efficiently decompose and metabolize some VOCs S Transform into microorganisms to achieve VOC S The carbon fixation function of the remaining VOC S As microbial energy, it is converted into carbon dioxide and water, thereby achieving VOC S Removal and purification;

[0015] The air-water separator uses inorganic porous lightweight fillers to remove moisture and impurities from the air, improve air dryness and cleanliness, reduce wind resistance, and at the same time extend the life of the bio-enzyme reaction box and reduce the subsequent reaction time;

[0016] The bio-enzyme reaction box further purifies the trace impurity gas components in the air after being degraded by microorganisms, and further decomposes and purifies them under the action of high-efficiency bio-enzymes with activated carbon as the carrier, ensuring that the outlet air meets the emission standards.

[0017] Beneficial effects of the utility model:

[0018] Compared with the prior art, the utility model has the following advantages:

[0019] 1. It can be processed at room temperature, which is safer. 2. It does not use natural gas, which avoids energy waste, and does not use catalysts. It relies on biological bacteria for online degradation, which is more environmentally friendly. 3. The equipment is simple, the investment cost-effectiveness is high, the operation is simple, the maintenance cost is low, and it is more economical. 4. It solves the problems of difficult gas-liquid mixing and difficult waste gas capture and degradation. 5. The cyclone tower in the utility model device can reuse the biological bacterial liquid to ensure the activity of the biological bacterial liquid, reduce space, and reduce costs at the same time. 6. It has low energy consumption, low cost, safety and environmental protection, and can meet the needs of enterprises for continuous production and online degradation of VOCs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of an embodiment of the online biodegradation VOCs device of the utility model.

[0021] Figure 2 This is a schematic structural diagram of another embodiment of the online VOCs biodegradation device of the utility model.

[0022] Reference numerals:

[0023] 1. Cyclone tower; 11. Cyclone; 12. Environmentally friendly filler adsorption layer; 13. Composite sprayer;

[0024] 2. Gas-water separator; 21. Primary water absorption zone; 22. Deep water absorption zone;

[0025] 3. Biological enzyme reaction box; 31. Biological enzyme;

[0026] 4. Fan;

[0027] 5. Chimney. DETAILED DESCRIPTION

[0028] The following is a further detailed description of the above contents of the utility model through specific implementation methods in the form of embodiments in conjunction with the accompanying drawings. However, it should not be understood that the scope of the above subject matter of the utility model is limited to the following examples. All technologies realized based on the above contents of the utility model belong to the scope of the utility model.

[0029] Example 1

[0030] like Figure 1As shown, an online biodegradation device for VOCs comprises a cyclone tower 1, a gas-water separator 2 and a biological enzyme reaction box 3 connected in sequence; the cyclone tower 1 causes the VOCs waste gas to perform high-speed rotational motion, and in this motion state, it is fully mixed and reacted with the biological bacterial liquid sprayed in the cyclone tower 1 to obtain a first purified gas that degrades and removes most of the VOCs; the gas-water separator 2 is used to remove moisture and impurities from the first purified gas to obtain a second purified gas; the biological enzyme reaction box 3 is provided with a biological enzyme 31 with activated carbon as a carrier, which is used to decompose and purify the second purified gas by the biological enzyme to obtain a third purified gas that can meet the emission standards. The cyclone tower 1 is provided with a cyclone 11 at the bottom, an environmentally friendly filler adsorption layer 12 at the top, and a composite sprayer 13 is provided below the environmentally friendly filler adsorption layer 12; wherein, the cyclone 11 is used to make the VOCs waste gas entering the cyclone tower 1 rotate at high speed, the environmentally friendly filler adsorption layer 12 is used to place environmentally friendly filler adsorption materials, and the composite sprayer 13 is used to spray biological bacterial liquid to degrade VOCs waste gas, and a part of the biological bacterial liquid is a continuously flowing liquid, and the other part is a liquid attached to the environmentally friendly filler adsorption material. The gas-water separator 2 includes a primary water absorption zone 21 composed of filter cotton and a deep water absorption zone 22 composed of multiple inorganic light porous fillers. The first purified gas first passes through the filter cotton to remove moisture and impurities, and then passes through multiple inorganic light porous fillers to completely remove moisture and impurities to obtain the second purified gas.

[0031] After the VOCs waste gas enters the cyclone tower 1, it passes through the cyclone in the tower. Under the traction of the fan 4, the waste gas enters the cyclone tangentially and makes a high-speed horizontal circular motion. Under the action of centrifugal force, it is fully mixed and reacted with the biological bacteria liquid. Another part of the waste gas passes through the environmentally friendly filler adsorption layer (the corresponding biological bacteria sprayed by the spiral nozzle of the composite sprayer are also evenly distributed on the environmentally friendly filler adsorption material). Due to the reasonable design of the environmentally friendly filler adsorption layer, the waste gas passes through the environmentally friendly filler adsorption layer for a long time, and the waste gas and the biological bacteria liquid have sufficient gas-liquid dissolution reaction time on the surface of the special environmentally friendly filler adsorption material, thereby achieving a higher purification rate. The gas-liquid mixed flow achieves the purpose of purification under the action of centrifugal force. It can ensure the purification of viscous waste gas, oily waste gas, fiber waste gas, and polishing waste gas, and it is not easy to block the air inlet channel and the environmentally friendly filler adsorption layer. The environmentally friendly filler adsorption material is an inorganic mineral, such as quartz sand, borax, boric acid, barite, barium carbonate, limestone, feldspar, etc., with a foaming agent added, and a lightweight porous inorganic filter material formed by high-temperature refining. Usually, it is an irregular particle with a diameter of 5-50 mm. The particle has a microporous structure with a porosity of 50% to 90% and a specific surface area of ​​more than 2 m 2 / g. Preferably, the particle specific gravity is less than or equal to 0.3KG / m3, and the microporous structure is mostly through-holes, with the minimum pore size as fine as micron level. Lightweight porous inorganic filter stone has good corrosion resistance to both acid and alkali. As a new type of filter material, it has the characteristics of large specific surface area, low density, low thermal conductivity, low relative density, high porosity and high adsorption rate. After the biological bacteria liquid is adsorbed on the surface, VOCs waste gas is effectively adsorbed, and the gas-liquid phase dissolution reaction time is increased, which has a good use effect on VOCs waste gas treatment.

[0032] After passing through the cyclone tower, the exhaust gas enters the gas-water separator 2, where it first passes through filter cotton to remove moisture and impurities, and then passes through multiple inorganic lightweight porous fillers to completely remove moisture and impurities in the gas.

[0033] After passing through the gas-water separator, the waste gas enters the bio-enzyme reaction box 3, where it is decomposed and purified under the action of bio-enzymes with activated carbon as the carrier to further purify the gas components containing trace impurities, ensuring that the outlet air meets the emission standards, and finally directly discharged from the chimney 5 through the fan 4.

[0034] The device for online biodegradation of VOCs described in this embodiment can continuously produce online degradable VOCs, has low energy consumption, low cost, safety and environmental protection, and can meet the needs of enterprises for continuous production of online degradable VOCs.

[0035] Example 2

[0036] The online biodegradation device for VOCs described in this embodiment is basically the same as the online biodegradation device for VOCs described in Example 1, except that: there are two sets of cyclone towers 1, and the two sets of cyclone towers 1 are connected in series. Figure 2 As shown, the device comprises two sets of cyclone towers 1, a set of gas-water separators 2 and a set of biological enzyme reaction boxes 3 which are connected in sequence.

[0037] like Figure 2 As shown, the bio-enzyme reaction boxes 3 are multiple sets, and the multiple sets of bio-enzyme reaction boxes are installed in parallel. The purpose is to provide spare bio-enzyme reaction boxes to ensure reliable waste gas treatment and ensure that the waste gas can meet the emission standards after treatment.

[0038] like Figure 2 As shown, the cyclone towers are multiple, and the multiple cyclone towers are installed in series. The purpose is to provide more effective waste gas treatment. For high-concentration VOCs waste gas, the use of two-stage series cyclone towers 1 can improve the degradation rate; after further purification through gas-water separation and biological enzyme reaction, it can meet the emission standards.

[0039] Example 3

[0040] The device for online biodegradation of VOCs described in this embodiment is basically the same as the device for online biodegradation of VOCs described in Example 1, except that: a rotating packing layer is arranged in the cyclone tower, and an environmentally friendly packing adsorption material is placed on the rotating packing layer; a liquid distributor is arranged in the center of the rotating packing layer, which is connected to the biological bacteria circulating water tank through a circulating pump, and can spray out biological bacteria liquid to degrade VOCs waste gas; a part of the biological bacteria liquid is a continuously flowing liquid, and the other part is a liquid attached to the environmentally friendly packing adsorption material.

[0041] After the VOCs waste gas enters the cyclone tower 1, it passes through the cyclone in the tower. Under the traction of the fan 4, the waste gas enters the cyclone tangentially and makes high-speed horizontal circular motion. Under the action of centrifugal force, it is fully mixed and reacted with the biological bacteria liquid. Another part of the waste gas passes through the rotating packing layer (the corresponding biological bacteria sprayed by the spiral nozzle of the composite sprayer are also evenly distributed on the environmentally friendly packing adsorption material on the rotating packing layer). Due to the reasonable design of the rotating packing layer and the environmentally friendly packing adsorption layer, the waste gas passes through the environmentally friendly packing adsorption layer for a long time, and the waste gas and the biological bacteria liquid have sufficient gas-liquid dissolution reaction time on the surface of the special environmentally friendly packing adsorption material, thereby achieving a higher purification rate.

[0042] The microbial liquid in the cyclone tower can be fully mixed with the VOC waste gas, and the liquid-gas contact time reaches more than 3S. Under the efficient solubilization effect of the microbial liquid on organic gas, the microorganisms can capture organic gas to the greatest extent, making VOC S Entering the microbial liquid phase, VOCs entering the microbial liquid phase S Microorganisms efficiently decompose and metabolize some VOCs S Transform into microorganisms to achieve VOC S The carbon fixation function of the remaining VOC S As microbial energy, it is converted into carbon dioxide and water, thereby achieving VOC S Removal and purification;

[0043] The air-water separator uses inorganic porous lightweight fillers to remove moisture and impurities from the air, improve air dryness and cleanliness, reduce wind resistance, and at the same time extend the life of the bio-enzyme reaction box and reduce the subsequent reaction time;

[0044] The bio-enzyme reaction box further purifies the trace impurity gas components in the air after being degraded by microorganisms, and further decomposes and purifies them under the action of high-efficiency bio-enzymes with activated carbon as the carrier, ensuring that the outlet air meets the emission standards.

[0045] The device for online biodegradation of VOCs described in this embodiment can continuously produce online degradable VOCs, has low energy consumption, low cost, safety and environmental protection, and can meet the needs of enterprises for continuous production of online degradable VOCs.

Claims

1. An online biodegradation device for VOCs, characterized in that: The device comprises a cyclone tower, a gas-water separator and a biological enzyme reaction box which are connected in sequence; the cyclone tower makes the VOCs waste gas perform high-speed rotational motion, and in this motion state, it is fully mixed and reacted with the biological bacterial liquid sprayed in the cyclone tower to obtain a first purified gas which degrades and removes most of the VOCs; the gas-water separator is used to remove moisture and impurities from the first purified gas to obtain a second purified gas; the biological enzyme reaction box is provided with a biological enzyme with activated carbon as a carrier, which is used to decompose and purify the second purified gas by the biological enzyme to obtain a third purified gas which can meet the emission standards.

2. The device according to claim 1, characterized in that The cyclone tower is provided with a cyclone at the bottom, and an environmentally friendly filler adsorption layer is provided at the top, on which environmentally friendly filler adsorption material is placed; a composite sprayer is provided below the environmentally friendly filler adsorption layer, which is connected to the biological bacteria circulating water tank through a circulating pump and can spray biological bacteria liquid to degrade VOCs waste gas.

3. The device according to claim 1, characterized in that A rotating packing layer is arranged in the cyclone tower, and the rotating packing layer is used to place environmentally friendly packing adsorption materials; a liquid distributor is arranged at the center of the rotating packing layer, which is connected to the biological bacteria circulating water tank through a circulating pump and can spray biological bacteria liquid.

4. The device according to claim 1, characterized in that The gas-water separator comprises a primary water absorption zone formed by filter cotton and a deep water absorption zone formed by multiple channels of inorganic light porous fillers.

5. The device according to claim 4, characterized in that The inorganic light porous filler is an irregular particle with a diameter of 5-50 mm, and the particle has a microporous structure, a porosity of 50% to 90%, and a specific surface area of ​​more than 2 m 2 / g.

6. The device according to claim 1, characterized in that The biological enzyme reaction boxes are in multiple sets, and the multiple sets of biological enzyme reaction boxes are installed in parallel.

7. The device according to claim 1, characterized in that The cyclone towers are multiple sets, and the multiple sets of cyclone towers are installed in series.

8. The device according to claim 2 or 3, characterized in that The environmentally friendly filler adsorption material is irregular particles with a diameter of 5-50 mm. The particles are microporous structures with a porosity of 50% to 90% and a specific surface area of ​​more than 2 m 2 / g.

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