Experiment Investigation Of Pulse Corona Discharge Decompose Gaseity Pollution VOCs

With the fast development of technology, the scope of chemical products becomes bigger and bigger, the variety of them are more and more ,their applications become wider and wider, and they are closer and closer to our lives. However, most of them are volatile which include volatile organic compounds (VOCs ) , emitting to the space in form of steam,. Many of them do harm to people' s health, they may result in cancer, aberrance, mutation. Volatile organic compounds would deteriorate air quality, which are paid more and more attention to. pulsed discharge plasma technology has been considerated to be a promising method among all technologies for controlling VOCs.Experimental research on decomposing VOCs by high-voltage pulse discharge is discussed in this paper. Based on the theory of pulse discharge, we built experimental device. The matching between the structure of discharge plasma reactor and high-voltage generator plays an important role in decomposition of VOCs, base on this reason, the manner of reactor combined with high-voltage power as we talked below: A needle-plate electrode structure driven by high-voltage pulse and AC power, In experiments, three types of electrode (taper-electrode, frustum-electrode, thallus-electrode) are used ,then compared the efficiency of toluene decomposition. A chisel-plate electrode structure driven by high-voltage pulse and AC power is used to investigate the decomposition characteristic of chlorobenzene. A line-cylinder electrode structure driven by high-voltage pulse and AC power is used to investigate the decomposition characteristic of chlorobenzene. Toluene and chlorobenzene are selected as representational matter of VOCs. Results of the research indicated that:(1) Three electrode structure bringed in pulse high voltage can increase breakdown voltage and enhance the stabilization of streamer discharge, which is advantageous for production of prompt energetic particle and for increasing the removal efficiency of VOCs.(2 ) Needle-plate electrode structure is investigated, different types of electrodes have effect on the discharge characteristic of the reactor and removal efficiency. In experiments, the highest decomposition rate and decomposition efficiency of toluene is attained with the frustum-electrode, which is 43% and 6.2. As chisel-plate electrode structure is used, streamer discharge is more stabilized, and the energy input is more efficient. This electrode is advantageous for production of energitic particle and for increasing of removal efficiency of VOCs. with the equivalence energy input, the highest decomposition rate and decompositionefficiency of toluene is attained, which is 35% and 6.5. Toluene is easier decomposed than chlorobenzene.(3) Experimental results of chisel-plate and line-cylinder decompose chlorobenzene indicates that peak voltage, chlorobenzene concentration and resort time have effect on chlorobenzene decomposition, and it is find that two electrode structure have same experimental results: the removal rate of chlorobenzene increases when applied voltage raises, and deduces when inlet concentration raises or resort time shorter.(4) Chisel-plate and line-cylinder driven by pulse power, catalyzer inspired by pulse high-voltage, the position of catalyzer introduced is investigated, results indicated that catalyzer combined with chisel-plate behind ground and line-cylinder combined with catalyzer in after-glow zone is more effective.