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Latest VOCs common waste gas filtration process scheme
2017-01-161416
1. Biological deodorization process
Haidelier HB series biological deodorization equipment is suitable for odor control in municipal sewage treatment plant, sewage pump station, waste treatment plant (station), petrochemical industry, pharmaceutical and chemical industry, food processing, spraying, printing, textile printing and dyeing, leather processing and other production industries.
The automatic filtration system can effectively separate the pollutants such as hydrogen sulfide, ammonia, methane, trimethylamine, methylmercaptan, methylsulfide, dimethyldisulfide, carbon disulfide and styrene, which are produced by the relevant systems of the above industries. These odor components are mainly the products of the organic substances in the water under the condition of hypoxia. The filter bed in the rear section can be selected according to the waste gas source conditions to strengthen the treatment.
Introduction of biological purification process: after the odor at each odor source is collected by the negative pressure of the gas gathering system, it is directly led into the washing biological filter bed deodorization equipment through the suction of the centrifugal fan. The front washing bed has the functions of effective dedusting, regulating the wet temperature of odor, reducing the impact of peak concentration and removing some water-soluble substances. In the later stage of the multi-stage biofilter, the odorant is degraded by a variety of microorganisms through gas-liquid and liquid-solid mass transfer.
2. Low temperature plasma technology
Low temperature plasma deodorization equipment is suitable for industries, such as pharmaceutical industry, printing and dyeing industry, manufacturing industry, chemical industry, chemical fiber industry, etc. during the operation process, a large number of volatile organic pollutants (VOCs) will be generated. Traditional treatment methods such as absorption, adsorption, condensation and combustion are difficult to achieve for low concentration VOCs, while photocatalytic degradation of VOCs has the problem of catalyst deactivation. Low temperature plasma is used to degrade VOCs VOCs can be processed without the limitation of the above conditions, which has potential advantages.
Low temperature plasma waste gas treatment and filtration equipment has also been widely used in environmental protection, packaging, textile, plastic products, automobile manufacturing, electronic equipment manufacturing, home appliance manufacturing, computer manufacturing, mobile phone manufacturing, biological materials, health materials, medical utensils, sterilization and disinfection, environmental protection equipment, oil and gas pipelines, heating pipelines, chemical engineering, semiconductor, aerospace And other industries.
Low temperature plasma is the fourth state after the solid, liquid and gas. When the applied voltage reaches the discharge voltage of the gas, the gas is broken down and a mixture including electrons, various ions, atoms and free radicals is produced. Although the electron temperature is very high, the temperature of heavy particles is very low, and the whole system presents a low temperature state, so it is called low temperature plasma. Low temperature plasma degradation of pollutants is to use these high-energy electrons, free radicals and other active particles and pollutants in the exhaust gas, so that the pollutant molecules decompose in a very short time, and take place various subsequent reactions to achieve the purpose of degradation of pollutants.
3. Organic waste gas treatment process
Overview of organic waste gas treatment methods, carbon hydrogen compounds (HC) is one of the important air pollutants, including simple organic compounds. At present, there are many kinds of gaseous organic pollutants, and there are many kinds of treatment methods, including absorption method, adsorption method, catalytic combustion method, combustion method, condensation method, etc. These methods have their own characteristics and advantages and disadvantages in application, which need to be weighed according to pollution degree, using environment and conditions. The common concerns of the environmental inspection agency and the pollution control party are: the initial investment cost, operation cost, secondary pollution, treatment effect, maintenance and other issues. In short, these methods can satisfy the treatment of gaseous pollutants under certain conditions.
Organic waste gas adsorption desorption condensation filtration recovery technology, organic waste gas filtration device adopts the combination of adsorption and condensation method to purify organic waste gas. Give full play to their advantages of high purification efficiency, make their disadvantages available for conversion, use low-temperature water vapor desorption for regeneration treatment of adsorbent, restore the activity of adsorbent, and recycle the organics after desorption. This is a relatively advanced treatment method for the purification of organic waste gas.
4. Adsorption catalytic combustion
The purification and filtration device is designed according to two basic principles of adsorption and catalytic combustion, namely adsorption concentration catalytic combustion method. The dedusting equipment adopts single bed adsorption to purify organic waste gas and catalyst filtration device to regenerate activated carbon. Firstly, the organic waste gas is adsorbed by the active carbon with low concentration. When it is almost saturated, the adsorption operation is stopped, and then the organic matter is desorbed from the active carbon by the hot gas flow to regenerate the active carbon. The desorbed organic matter has been concentrated (the concentration is dozens of times higher than the original) and sent to the catalytic combustion chamber for catalytic conversion to CO2 and H2O for discharge. When the concentration of the organic waste gas reaches more than 2000 ppm The organic waste gas can maintain spontaneous combustion in the catalytic bed without external heating. Part of the tail gas after combustion is discharged into the atmosphere, and most of it is sent to the adsorption bed for desorption and regeneration of activated carbon. The regenerated activated carbon can be used for the next adsorption. The filter device uses the catalytic combustion method to convert toxic and harmful organic gases into non-toxic gases.
5. RTO regenerative oxidation furnace
RTO, regenerative oxidation furnace, is a kind of high efficiency organic waste gas filtration equipment. Its principle is to oxidize the combustible waste gas into corresponding oxides and water under high temperature, so as to purify the waste gas and recover the heat released during the decomposition of waste gas. The decomposition efficiency of waste gas is more than 99%, and the heat recovery efficiency is more than 95%. The main structure of RTO is composed of combustion chamber, ceramic packed bed and switching valve, etc
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