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PURPOSE : A method for generating arc plasma is provided to reduce production cost by treating noxious gas and PM at the same time and simplifying structure for easy fabrication and obtain economical product by reducing material cost of apparatus using inexpensive materials, and an apparatus for removing noxious gas using the same is provided. CONSTITUTION : In a plasma reactor for treating noxious gases by consistently generating strong arc plasma, the plasma reactor is characterized in that a power supply is partially impressed, particles are formed around electrodes, and dielectric substance put on earth is spaced apart from the particles and electrodes in a distance of several mm or less, wherein the reactor not only generates strong arc plasma consistently compared to existing plasma apparatus, but also has excellent stability and substantially reduce energy consumption compared to other products, and although impurities such as PM generated during combustion are penetrated into the reactor, electric discharging is stably performed, and a certain level of PM is burnt and treated together with noxious gases in the reactor.