This paper introduces the principle of low temperature plasma technology to degrade VOCs, the existing problems of low temperature plasma and the improvement of low temperature plasma technology to degrade VOCs. In general, plasma technology is expected to overcome immediate shortcomings and put into large-scale applications in the near future.
Low-temperature plasma degradation of VOCs new technology is expected to large-scale application
VOCs, also known as volatile organic compounds, are known to over 300 species including non-methane total hydrocarbons, benzene compounds, volatile halogenated hydrocarbons, alcohols, ethers, lipids, phenols, fatty acids ), Small molecule polymers, polymers, thiols, amines and the like. VOCs treatment technologies include recycling technologies and destruction technologies. Among them, traditional technologies include condensation technology, adsorption technology, absorption technology, thermal incineration, catalytic combustion and biodegradation. New technologies include membrane separation, plasma, photolysis and oxidation Method and photocatalytic oxidation method.
In the new technology, the membrane separation technology is adopted for VOCs gas with high concentration, easy recovery and recovery value. However, for low concentration and non-recovery VOCs, the plasma technology, photodecomposition oxidation technology and photocatalytic oxidation technology are used to decompose them into small Molecule, carbon dioxide and water. Plasma technology is a new technology, now the principle of plasma degradation of VOCs, existing problems and improvements are described below:
1, low-temperature plasma technology to degrade VOCs principle
The basic principles of low-temperature plasma degradation of various pollutants are as follows:
Under the action of a strong electric field, electrons are released from the electric field to generate energetic electrons through the discharge medium. A large number of electron-excited entrained electrons continuously and rapidly bombard and tear pollutant molecules and pollutant molecules under such conditions, Ionization, dissociation and excitation and so on, and thus become active groups; these reactive groups and molecules or atoms, reactive groups and reactive groups collide with each other, will cause a series of pollutants molecule complex chemical and physical Reaction; these reactions make more complex, long-chain contaminant macromolecules tear into a simple, safe small molecule material, to achieve the transformation of toxic and harmful substances as low toxicity, low toxicity, non-toxic and harmless safety Substance, to remove, degradation of pollutants. Due to the average energy of 10eV generated after the ionization of electrons, the energy transfer process can achieve a chemical reaction which is very slow or difficult to react and the reaction rate is very high under strict control of the reaction conditions. Low-temperature plasma technology has become a high-tech with extremely strong advantages in the field of VOCs processing and has been widely applied in the market. Plasma technology has gained wide attention and high recognition in relevant disciplines at home and abroad.
2, low-temperature plasma problems
1) When the VOCs concentration is high, the low temperature plasma should not be used as an independent processing unit generally. It needs to be used jointly with other processing units to obtain good treatment effect as a secondary purification unit.
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