CN203355584U - Treatment equipment for volatile organic pollutant waste gas - Google Patents

Abstract

The utility model provides treatment equipment for volatile organic pollutant waste gas. The equipment comprises a gas-collecting hood, a dry type filtering and dust removing device, a plasma purification treatment device and an ozone oxidation treatment device; the gas-collecting hood is arranged in front of the dry type filtering and dust removing device and used for collecting waste gas containing organic pollutant and conveying the waste gas to the dry type filtering and dust removing device for dust removal treatment; the plasma purification treatment device is arranged behind the dry type filtering and dust removal device and used for preliminarily purifying the waste gas; the ozone oxidation treatment device is arranged behind the plasma purification treatment device and used for purifying the waste gas secondarily.

Description

Treatment equipment for volatile organic pollutant waste gas

technical field

The utility model belongs to waste gas treatment equipment, in particular to a treatment equipment for volatile organic pollutant waste gas.

Background technique

With the wide application of organic chemical products in industrial production, more and more organic pollutants enter the atmosphere, mainly low-boiling volatile organic compounds (volatile organic compounds, referred to as VOCs), that is, the saturated vapor pressure at room temperature Organic compounds with a boiling point greater than 71Pa or lower than 260°C under normal pressure. VOCs mainly come from: petrochemical, pharmaceutical, printing, papermaking, bonding, paint decoration and other processes, paint, shoemaking, spray painting, rubber and plastic product molding, photosensitive film and kinescope coating, surface anticorrosion, transportation The most common type of pollutants discharged during the production, storage and transportation of metal plating, textile and other industries. VOCs waste gas will be generated, including various hydrocarbons, halogenated hydrocarbons, alcohols, ketones, aldehydes, phenols, ethers, acids, amines, etc. Organic pollutants such as hydrocarbons, aromatic hydrocarbons, and lipids.

These pollutants are of various types and widely distributed. They are another class of air pollutants that cannot be ignored after particulate matter, sulfur dioxide and nitrogen oxides. Their emissions not only cause a great waste of resources, but also seriously pollute the environment. The discharge of volatile organic waste gas into the atmosphere will cause environmental problems such as photochemical smog and ozone layer destruction; most VOCs are also toxic, irritating, and even carcinogenic, which can damage blood components and cardiovascular system, cause gastrointestinal disorders, induce Immune system, endocrine system and hematopoietic system diseases cause metabolic defects and cause serious harm to human health. Excessive emissions of VOCs will also cause harm to industries such as agriculture, forestry and animal husbandry. At the same time, with the development of industry and the improvement of people's living standards, the emission of VOCs is increasing day by day, and has the characteristics of wide range and large emission. In 1990, the U.S. Clean Air Act Amendment listed 189 toxic and harmful gases, most of which are VOCs. Carrying out research on the comprehensive treatment of VOCs has become a hot spot in the current international environment. Therefore, the treatment of VOCs has attracted more and more attention from all over the world. Many countries have issued corresponding laws and regulations to limit the emission of VOCs; With the increasingly serious threat to health, it is urgent to find an economical and efficient VOCs degradation technology.

At present, the means of VOCs waste gas treatment at home and abroad are mainly adopted: 1. Adsorption method; 2. Absorption method; 3. Direct combustion method; 4. Catalytic combustion method; 5. Biological method; 6. Pollutant recovery method; Combustion; 8. Photocatalytic methods, etc., they have problems such as high equipment investment, high operating cost, small processing gas volume, unstable work, large space occupation, low processing efficiency, and secondary pollution to varying degrees.

Contents of the invention

The technical problem to be solved by the utility model is to provide a treatment equipment for volatile organic pollutant waste gas in view of the above-mentioned defects of the prior art, which can efficiently remove VOCs without secondary pollution, and the equipment can adapt to various Pollution environment, strong adaptability, large processing capacity.

Another object of the present utility model is to provide a treatment equipment for volatile organic pollutant waste gas, which has low investment, low operation cost and small equipment volume.

The utility model is achieved in the following way: a treatment equipment for volatile organic pollutant waste gas, which is characterized in that the equipment includes a gas collecting hood, a dry filter dust removal device, a plasma purification treatment device and an ozone oxidation treatment device, the said The gas collection hood is set before the dry filter and dust removal device to collect the waste gas containing organic pollutants, and transmit the waste gas to the dry filter and dust removal device for dust removal treatment. The dry filter and dust removal device is equipped with plasma purification treatment after device, the plasma purification treatment device performs the first step of purification of the exhaust gas, and the plasma purification treatment device is equipped with an ozone oxidation treatment device, and the ozone oxidation treatment device performs the second step of purification of the exhaust gas.

The utility model equipment filters and removes VOCs waste gas through a dry filter and dust removal device to remove dust particles in the waste gas, avoiding the influence of dust particles on subsequent processing, and further performs cracking and purification treatment on VOCs waste gas through a plasma purification treatment device: In the plasma purification treatment device, high-energy electrons collide with gas molecules and atoms inelastically, and the energy is converted into the internal energy of molecules and atoms in the ground state, and a series of processes such as excitation, dissociation and ionization occur, so that the gas is in an activated state; During the process, a large number of free radicals such as O, OH, HO ₂ and active particles and highly oxidizing O ₃ are produced. These active species are easy to chemically react with the gas in the activated state. At the same time, the catalyst on the catalytic purification net can further Convert most O ₃ into oxygen ions (O-, O+) and hydroxyl OH and active oxygen species (O ^* , O ₂ ^*, etc.), these particles are more active than O ₃ , thus greatly improving the treatment efficiency. O, OH, HO ₂ , O-, O+, O ₃ , active oxygen species (O ^* , O ₂ ^* , etc.) These active species react with organic molecules, broken organic molecular groups, etc., organic molecules Harmless or low-hazardous substances that are finally oxidized and degraded into CO ₂ and H ₂ O or small molecules. Then use the ozone oxidation treatment device to completely oxidize and purify the untreated escaped part of the pollutants and partially generated intermediate products in the gas, so that the organic molecules are finally completely oxidized and degraded into CO ₂ and H ₂ O or small molecules. Harmless substances, avoiding the use of low-temperature plasma for treatment alone, some pollutants escape and partially generated intermediate products have not been treated, and the defects of incomplete decomposition are not complete. The utility model has thorough decomposition treatment, high purification treatment efficiency, and reduces The pollution of volatile organic pollutants to the environment and the harm to human health are eliminated.

The treatment equipment for waste gas of volatile organic pollutants, the gas collecting hood, the dry filter dust removal device, the plasma purification treatment device and the ozone oxidation treatment device are respectively connected through pipelines.

The dry filter and dust removal device has a closed dry filter and dust removal box, which is provided with at least one layer of filter material composed of high-grade filter paper, synthetic fiber non-woven fabric, etc., and the opposite sides of the filter and dust removal box are respectively A box body inlet for waste gas entering the box body and a box body outlet for exhaust gas to flow out after dust removal treatment are provided.

The plasma purification treatment device has a closed plasma purification box, the plasma purification box is provided with an inlet and an outlet; the plasma purification box is provided with at least one group of high-energy plasma generating devices, and each plasma The generating device is composed of at least one high-energy plasma purification tube, the at least one high-energy plasma purification tube is arranged in layers at intervals, and at the same time, plasma Body catalytic purification net.

Each of the above-mentioned high-energy plasma purification tubes is uniformly arranged in a vertical state and fixed in the box, or the high-energy plasma purification tubes are arranged in a horizontal state and evenly layered, and fixed on the inner wall of the plasma purification box .

Furthermore, the above-mentioned plasma catalytic purification net adopts a hexagonal honeycomb aluminum substrate structure, so that the left and right sides of the plasma catalytic purification net are transparent and the wind resistance is extremely small.

The ozone oxidation treatment device includes an ozone generator and an oxidation treatment tower, and the air inlet of the ozone generator is communicated with the external environment for delivering oxygen in the air to the ozone generator; the ozone outlet of the ozone generator is connected with the oxidation treatment tower. The treatment towers are connected, and the oxidation treatment towers are respectively provided with an oxidation treatment tower inlet and an oxidation treatment tower outlet.

Furthermore, a deflector is arranged in the oxidation purification tower, the deflector is arranged horizontally in the oxidation purification tower, one end is fixed on the oxidation purification tower wall, and one end extends laterally to prolong the residence time of the exhaust gas in the oxidation purification tower, The exhaust gas can be fully oxidized in the oxidation purification tower.

Moreover, there are a plurality of deflectors, which are staggeredly arranged in the oxidation purification tower, so as to effectively increase the residence time of the exhaust gas in the oxidation purification tower.

The volatile organic pollutant waste gas treatment equipment is also provided with a waste gas conveying device, and the waste gas conveying device is arranged before the dry filter and dust removal device, or after the ozone oxidation treatment device; usually, the The waste gas conveying device is a fan or a conveying pump.

The utility model can efficiently treat volatile organic pollutants. Not only can it efficiently remove VOCs, but it can also efficiently remove major pollutants such as inorganic substances, hydrogen sulfide, ammonia, mercaptans, and various high-concentration odorous waste gases, especially VOCs purification treatment efficiency can reach up to 99%, which is higher than that of a single The purification treatment efficiency of low-temperature plasma cracking treatment is increased by more than 26%, and there is no secondary pollution; the equipment can adapt to a variety of polluted environments, with strong adaptability and large processing capacity, and is suitable for various concentrations, various air volumes, and different types of volatilization Purification of waste gas of sexual organic pollutants.

Description of drawings

Fig. 1 is a schematic diagram of the equipment structure implemented by the utility model.

Fig. 2 is a schematic structural diagram of a plasma purification treatment device implemented in the present invention.

Fig. 3 is a structural schematic diagram of an ozone oxidation treatment device implemented in the utility model.

Detailed ways

Below in conjunction with accompanying drawing, technical solution of the utility model is described in detail:

Fig. 1 is a structural schematic diagram of an embodiment of the utility model equipment. As shown in Figure 1, the volatile organic pollutant exhaust gas treatment equipment realized by the utility model includes a gas collection hood 1 connected through a pipeline 2, a dry filter dust removal device 4, a plasma purification treatment device 7, an ozone Oxidation treatment device. Wherein, the gas collecting hood 1 is arranged before the dry filter and dust removal device 4 to collect waste gas containing organic pollutants, and transmit the waste gas to the dry filter and dust removal device 4 for dust removal; A control valve 3 is provided to control the input waste gas; a plasma purification treatment device 7 is arranged after the dry filter and dust removal device 4, and the plasma purification treatment device 7 performs the first step of purifying the waste gas, and the plasma purification treatment device 7 Finally, an ozone oxidation treatment device is installed, and the ozone oxidation treatment device performs a second step of purification of the exhaust gas.

The ozone oxidation treatment device comprises an ozone generator 5, an oxidation purification tower 8, and the ozone outlet of the ozone generator 5 is communicated with the oxidation purification tower 8 through a pipeline 2, and a blower fan is arranged between the ozone generator 5 and the oxidation purification tower 8 6.

A centrifugal blower 9 is provided on the pipeline 2 behind the oxidation purification tower 8, and the centrifugal blower 9 is connected to a discharge cylinder 10 to discharge the purified gas into the atmosphere.

Fig. 2 is a schematic diagram of the structure of the plasma purification treatment device of the present invention. As shown in Figure 2, the plasma purification processing device 7 has a closed plasma purification box 71, and the plasma purification box 7 is provided with an inlet and an outlet (conventional settings, so not marked); in the plasma purification box 71 There are multiple sets of high-energy plasma generating devices 72 (set the number of high-energy plasma generating devices 72 according to the needs of waste gas treatment, generally 4-6 groups), and the plasma generating devices 72 are composed of one or more high-energy plasma Purification pipe 73 forms.

Moreover, a plurality of high-energy plasma purification tubes 73 are arranged in layers at intervals, and plasma catalytic purification nets (conventional settings) are arranged at each layer interval position of the high-energy plasma purification tubes 73, the inlet and the outlet of the plasma purification box 71 , so not marked). As shown in FIG. 2 , each high-energy plasma purification tube 73 is vertically and evenly arranged in layers, and is fixed in the plasma purification box 71 . In other embodiments, the high-energy plasma purification tubes may also be arranged horizontally and evenly in layers.

The high-energy plasma purification tube 73 of this embodiment adopts an AC220V alternating power supply, and the power is adjustable from 40 to 100 W. The high-voltage alternating current acts on the high-energy plasma purification tube 73 to generate high-energy active plasma, which can be It can purify the exhaust gas and is suitable for continuous and uninterrupted operation. The opposite sides of the plasma purification box 71 are respectively provided with a box inlet for exhaust gas to enter the box and a box outlet for exhaust gas to flow out after purification treatment. The outlets of the bodies are equipped with multi-layer catalytic purification nets. The catalyst on the catalytic purification nets in this embodiment is MnO ₂ , and the catalyst MnO ₂ is impregnated and coated on the catalytic purification nets with γ-Al ₂ O ₃ as the carrier. The catalytic purification nets are made of six The side-shaped honeycomb-shaped aluminum substrate structure has extremely small air resistance on the left and right sides. During the plasma purification process, a certain amount of ozone O ₃ will be generated. Under the action of the catalyst, O ₃ can be converted into oxygen ions (O-, O+ ) and hydroxyl OH and active oxygen species (O ^* , O ₂ ^*, etc.), and the activity of these particles is higher than O ₃ , thereby greatly improving the treatment efficiency.

Fig. 3 is shown in conjunction with Fig. 1, is the structural representation of the ozone oxidation treatment device that the utility model implements, and as shown in the figure, the ozone oxidation treatment device comprises ozone generator 5, oxidation purification tower 8, and the ozone outlet of ozone generator 5 passes through The pipeline 2 communicates with the oxidation purification tower 8, and the air inlet of the ozone generator is connected with the external environment, and is used to deliver the oxygen in the air to the ozone generator 5. In order to satisfy the amount of oxygen in the ozone generator, the ozone The generator 5 is followed by a fan 6 (possibly also a delivery pump, eg a vacuum pump). The ozone generator 5 adopts a high-voltage discharge type ozone generator, and a high-voltage current of a certain frequency creates a high-voltage corona electric field, so that oxygen molecules in the air in or around the electric field undergo electrochemical reactions to produce ozone. Moreover, in the implementation of the utility model, both the fan 6 and the ozone generator 5 are controlled by frequency conversion, which can automatically adjust the amount of ozone produced according to different waste gas treatment conditions, so as to achieve the best treatment effect and reduce energy consumption.

In other embodiments, the fan 6 used to provide air to the ozone generator on the pipeline 2 may not be provided, depending on the on-site treatment situation. If the exhaust gas volume is large and the concentration is high, the fan 6 should be provided. To provide sufficient air for ozone generation.

Referring to Fig. 3, the oxidation purification tower 8 is respectively provided with an oxidation purification tower inlet 81 and an oxidation purification tower outlet 82, and at the same time, a deflector 83 is arranged in the oxidation purification tower 8, and multiple deflectors 83 can be arranged, and they are arranged in a staggered manner on the oxidation purification tower 8. In the purification tower 8, the residence time of the exhaust gas in the oxidation purification tower is prolonged, so that the exhaust gas can be fully oxidized in the oxidation purification tower.

Working process: After the equipment is started, the plasma purification treatment device and the ozone oxidation treatment device are started, the gas collection hood 1 will collect the VOCs waste gas to be treated and enter the dry filter and dust removal device 4, and the dust removal treatment will be carried out first, and the waste gas after dust removal will enter again In the plasma purification box 71 of the plasma purification treatment device 7, multi-layer catalytic purification nets are arranged at the entrance, middle, and exit of the plasma purification box, and high-energy plasma purification tubes (using AC220V alternating power supply) are used in the box. , the power is adjustable from 40 to 100W), instantly cracking and purifying the VOCs waste gas molecules: the high-energy electrons in the low-temperature plasma collide with gas molecules and atoms inelastically, and convert the energy into the internal energy of molecules and atoms in the ground state. A series of processes such as excitation, dissociation, and ionization make the gas in an activated state; during the collision process, a large number of free radicals such as O, OH, and HO ₂ and active particles and highly oxidizing O ₃ are generated. These active species are easily A chemical reaction occurs with the gas in the activated state, and at the same time, the catalyst on the catalytic purification network can further convert most of the _O3 into oxygen ions (O-, O+) and hydroxyl OH and active oxygen species (O ^* , _O2 ^* , etc. ), these particles are more active than O ₃ , thus greatly improving the treatment efficiency. O, OH, HO ₂ , O-, O+, O ₃ , and reactive oxygen species (O ^* , O ₂ ^*, etc.) These active species react with organic molecules, broken organic molecular groups, etc., organic matter Molecules are finally oxidized and degraded into _CO2 and _H2O or small molecules of harmless or low-hazardous substances. Then use the ozone oxidation treatment device to completely oxidize and purify the untreated escaped part of the pollutants and partially generated intermediate products in the gas, so that the organic molecules are finally completely oxidized and degraded into CO ₂ and H ₂ O or small molecules. Harmless substances, the utility model decomposes and treats thoroughly, has high purification treatment efficiency, reduces the pollution of volatile organic pollutants to the environment and the harm to human health, and finally discharges them up to the standard through the discharge cylinder.

The utility model is suitable for petrochemical, pharmaceutical, printing, papermaking, bonding, paint decoration and other processes, paint, shoemaking, painting, rubber and plastic product molding, photosensitive film and kinescope smearing, surface anticorrosion, transportation, The VOCs discharged during the production, storage and transportation of metal plating and textile industries are purified, and the purification treatment efficiency of VOCs waste gas such as toluene, xylene, and non-methane total hydrocarbons reaches more than 99%.

In a word, the utility model has the following beneficial effects: 1. The equipment can work continuously 24 hours a day, and the operation is stable and reliable. 2. Low energy consumption and low operating cost: it can react with the catalyst at room temperature without heating, which greatly saves energy. The purification equipment has no mechanical action, no noise, no special management and daily maintenance, and only needs regular inspection. The purification equipment has low energy consumption (only about 0.26 kWh of electricity is consumed per 1,000 cubic meters per hour of processing), and the wind resistance of the purification equipment of the utility model is extremely low, generally less than 150pa, which can save a lot of exhaust power energy consumption. 3. Easy to use: It can be adjusted according to the change of air volume and site conditions during design. 4. Exhaust gas does not need pretreatment: VOCs exhaust gas does not need special pretreatment, such as heating, etc., and the working environment temperature of the equipment can operate normally between -35°C and 95°C. 5. The equipment occupies a small area and has a light weight: it is suitable for special occasions such as compact layout and small venues. 6. It is suitable for treating exhaust gases of various concentrations and air volumes, especially for odorous and low-concentration gases with large air volumes: the purification equipment has a high degree of automation and controllability, adopts PLC automatic control, and can be discharged according to the composition and concentration of VOCs exhaust gas , The gas volume automatically regulates the output power and purification efficiency of the purification treatment equipment, such as automatically opening the number of plasma purification tubes with different numbers, and automatically adjusting the output power of the ozone generator, which not only achieves the best purification treatment effect of exhaust gas, but also greatly reduces Reduce energy consumption and achieve a win-win situation of environmental protection and economic benefits. 7. No radiation is produced. 8. The equipment of the utility model can completely crack and oxidize the toxic and harmful substances in the VOCs waste gas without producing by-products. The catalyst has strong adaptability, and can selectively degrade the by-products produced in the plasma reaction, while reusing ozone The oxidation treatment device completely oxidizes and purifies some untreated escaped pollutants and intermediate products in the gas, so that the pollutant molecules are finally completely oxidized and degraded into CO ₂ and H ₂ O or small molecular harmless substances , After VOCs waste gas purification treatment, the gas completely reaches the harmless high standard discharge, no waste, waste water and other intermediate products are discharged, and no secondary pollution occurs.

The foregoing descriptions are merely examples of the present invention, and should not limit the scope of implementation of the present invention. All equal changes and modifications made according to the patent scope of the utility model should fall within the coverage of the utility model patent.

Claims (10)

1. the treatment facility of a volatile organic contaminant waste gas, it is characterized in that this equipment includes gas skirt, dry filter dust arrester, plasma for purification treating apparatus and ozone Oxidation Treatment device, before described gas skirt is arranged at the dry filter dust arrester, be provided with the plasma for purification treating apparatus after described dry filter dust arrester, be provided with the ozone Oxidation Treatment device after the plasma for purification treating apparatus.

2. the treatment facility of volatile organic contaminant waste gas as claimed in claim 1, is characterized in that described gas skirt, dry filter dust arrester, plasma for purification treating apparatus and ozone Oxidation Treatment device pass through respectively pipeline connection.

3. the treatment facility of volatile organic contaminant waste gas as claimed in claim 1, it is characterized in that described dry filter dust arrester has the dry filter dust-removing box of sealing, be provided with the filtering material of at least one floor height level filter paper, non-woven fabrics of synthetic fiber formation in the dust removal by filtration casing, the both sides that the dust removal by filtration casing is relative are respectively arranged with the casing outlet that enters the casing import of casing and flow out for waste gas after dust removal process for waste gas.

4. the treatment facility of volatile organic contaminant waste gas as claimed in claim 1, is characterized in that described plasma for purification treating apparatus has the plasma for purification casing of a sealing, is provided with import and outlet on the plasma for purification casing; Be provided with at least one group of energetic plasma generating means in the plasma for purification casing, and each plasma producing apparatus is to consist of at least one energetic plasma purification pipe, described at least one energetic plasma purification pipe interval layering arranges, simultaneously, all be provided with the plasma-catalytic purifying net in interval location place, import and the exit of every floor height energy plasma for purification pipe.

5. the treatment facility of volatile organic contaminant waste gas as claimed in claim 4, all layering in vertical state is evenly distributed to it is characterized in that above-mentioned each energetic plasma purification pipe, and be fixed in casing, the perhaps described energetic plasma purification pipe even laminating setting that is the level of state, and be fixed on plasma for purification box inside wall.

6. the treatment facility of volatile organic contaminant waste gas as claimed in claim 4, is characterized in that above-mentioned plasma-catalytic purifying net adopts the cellular aluminium base structure of hexagon.

7. the treatment facility of volatile organic contaminant waste gas as claimed in claim 1, it is characterized in that the ozone Oxidation Treatment device includes ozone generator, oxidation processes tower, the air intlet of ozone generator and external environment UNICOM, for by airborne oxygen infusion to ozone generator; The ozone delivery outlet of ozone generator is communicated with the oxidation processes tower, is respectively arranged with the import of oxidation processes tower and the outlet of oxidation processes tower on the oxidation processes tower.

8. the treatment facility of volatile organic contaminant waste gas as claimed in claim 7, is characterized in that, in described oxidation, purification tower, deflector is set, and deflector is horizontally set in the oxidation, purification tower, and an end is fixed on oxidation, purification tower wall, and an end crosses out.

9. the treatment facility of volatile organic contaminant waste gas as claimed in claim 8, is characterized in that described deflector, has a plurality ofly, is crisscross arranged in the oxidation, purification tower.

10. the treatment facility of volatile organic contaminant waste gas as claimed in claim 1, the treatment facility that it is characterized in that described volatile organic contaminant waste gas, also be provided with exhaust-carrying device, before described exhaust-carrying device is arranged on the dry filter dust arrester, or after being arranged on the ozone Oxidation Treatment device.

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