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    The present situation of the application of activated carbon in the treatment of waste gas
    Source: Jiangsu Liaoyuan Activated Carbon Co., Ltd   Time2016/6/24 11:37:03

    Activated carbon which in the waste gas treatment of far less wastewater treatment active, because the traditional waste gas processing method, such as electric dust collector, cyclone dust collector method, granite water film removal law are of exhaust gas treatment can achieve good results, such as electrostatic precipitator removal of pollutants can reach 98%. But this does not mean that the activated carbon in this useless, activated carbon in the removal of a strong carcinogenic substance of aromatic compounds became a hot research, and the two people this is only for few research. Moreover, the research direction and wastewater processing overlap (if the application of activated carbon fiber.
    Application of activated carbon fiber in waste gas treatment. China's coating industry in the production process uses large amounts of organic solvents, there are three benzene (benzene, toluene, xylene, styrene cyclohexanone, acetone, turpentine, methanol, ethanol, propanol, butanol and gasoline, methyl acetate, ethyl acetate, butyl acetate, etc.. These volatile organic solvents, in addition to a waste of resources, but also seriously harm the health of the production workers. Jin Yuquan and other than the surface area of 1200m2/g. Fibrous battings monolayer thickness of 2mm activated carbon fiber for the treatment of benzene waste gas, when in the filtration rate of 0 to 20m / s. below, the activated carbon fiber for benzene, toluene, xylene, and their mixture purification efficiency as high as 90%. Also in dichloromethane waste gas treatment project. The design uses three boxes adsorption system, when the exhaust gas flow of 10000 m3 / h, concentration of dichloromethane waste gas 3000mg/m3 conditions, equipment after half a year, running status has been good, adsorption efficiency has been guaranteed to in more than 97%, has greatly improved the atmospheric environment, the annual net income of 75 4 million yuan. And the traditional activated carbon adsorption removal efficiency is about 70%.
    Application of modified activated carbon in the treatment of waste gas. As is known to all, China's energy consumption in the contribution of the largest coal, resulting in the largest number of exhaust gas. Coal mainly produces SO2 and NOX emissions, these two kinds of waste gas is the main reason for the formation of acid rain. China's third largest acid rain area there are two major is belongs to the soot type acid rain and a (acid rain in South China) is belong to the soot - car exhaust compound type acid rain, coal waste gas emission control of our country environment is of great significance. The desulfurization and denitrification treatment effect of modified activated carbon material is good, the cost of investment is low, and it is easy to use and so on. Modified activated carbon materials for flue gas desulfurization and denitration is, first of all, the adsorption properties of activated carbon materials using the flue gas pollution of SO2 and NOx physical adsorption on the surface of activated carbon materials, in the functional groups on the surface of activated carbon materials or bear the catalytic effect of metal loading under, SO2 and NOx into SO3 and no pollution of N2 or O2. In the presence of water vapor, SO3 will be combined with water to produce sulfuric acid recovery.
    Study on factors influencing the adsorption of activated carbon. Studies have shown that with active carbon fiber (ACF) as an adsorbent, with constant temperature and constant pressure air as carrier gas, by bubbling method the allocation of a certain concentration of butyl acetate in gas, when the gas velocity is 0.06m/s, near the equilibrium adsorption capacity of ACF 600mg/g. Experimental results show that, in the temperature, gas flow rate, gas concentration of three factors, the equilibrium adsorption amount of the ACF temperature, with the increase of temperature, the equilibrium adsorption amount of butyl acetate in ACF decreased, reduce the mass transfer coefficient penetrating layer height increases.
    Activated carbon adsorption method is used for the treatment of low concentration organic waste gas, which has the advantages of high removal rate, convenient recovery and so on. Waste gas is often mixed with water vapor. The working efficiency of the adsorption column is decreased and the operating cost is increased, and the recovery efficiency of the organic solvent is decreased. The isothermal adsorption capacity of 4 low concentration organic vapors (VOC) on activated carbon at different relative humidity () at different relative humidity (RH) was determined by the adsorption column breakthrough curve method at the Environmental Engineering Institute of Zhejiang University. The results showed that the inhibitory effect of water vapor on the VOC adsorption equilibrium, increases with increasing RH increases, the VOC concentration decreased and with the enhancement of VOC molecules polarity has increased in size; inhibition of VOC on water vapor adsorption equilibrium. With the enhancement of VOC molecules polarity and weakened. A based on the competitive adsorption mechanism of polanyin dubiin equation explain effects of low concentration VOCs on activated carbon adsorption equilibrium of air humidity.


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