Experimental Study Of Treatment Of Formaldehyde By RF Discharge

Oil processing, production of industrial solvents and chemical products, and the storage and transportation of organic materials, and so on, will produce all sorts of VOCs. Most of VOCs are toxic, hazardous to human health; and participate in the formation of photochemical smog and aerosols, pollute the environment; halogenated organic compounds can damage the ozone layer. VOCs pollution problem has attracted world attention. The United States, Japan, and the European Union implement strict emission standards for VOCs many years ago.At the present time, the ways of dealing with them (condensation,absorption,adsorption,combustion et al.) for the VOCs of low concentration and big flux have the limitation in technique and economy. So study the ways of how to reclaim or decompose that is one of the important things of our country's environment protection work. With the development of non-thermal plasma technique, non—thermal plasma processing is considered as an effective ways to deal with VOCs, having the advantage of high decomposition efficiency,low energy consumption and simple structure. According to the science study in the past, the kinds of cryogenic plasma oxidation for the removal of VOCs mainly include pulsed corona discharge, dielectric barrier discharge, and capacitively coupled discharge and so on, but study on inductively coupled plasma is less. This article focuses on the treatment of formaldehyde by inductively coupled plasma.Under the foundation of referring to a lot of mutually literature, the author summarizes the latest research general situation, rationale and developmental tendency. Based on the research and basic principle of the deleterious gas, the experimental equipment and object about the degradation of formaldehyde by inductively coupled plasma is designed. The influencing factors and influencing disciplinarians obtained from the experiments shows that the removal rate reaches to 99.3%. Formaldehyde removal efficiency increases with time and input power increasing. But formaldehyde removal efficiency reduces with system pressure, flux and inlet concentration increasing.Finally, in-depth analysis and discuss on the experimental data are accomplished. The results show that high-energy electrons produced by inductively coupled plasma collide with formaldehyde molecules to produce various chemical activated species such as CH2O*. At the same time, C-H of formaldehyde molecules can be cut easier than C=O. It will produce·CHO, which enriches the variety of chemical reaction in the reactor system. The air will produce excavated oxygen atom by inductively coupled plasma. When they collide with·CHO and other atom, molecule, they produce all kinds of radical which contains oxygen atom. These radical react more and the final reaction products are CO2, H2O, CO. The result indicates that plasma technology is available to remove indoor formaldehyde.