Air pollution control by electrical discharges

摘要: Air pollution caused by gas emission of pollutants produced from a wide range sources including coal, oil and burning power plants, diesel engines, paper mills, steel chemical production plants must be reduced drastically urgently, as mandated recent worldwide national legislation which recently are being reinforced increasingly international agreements. Non-thermal plasmas in the mean energy electrons is substantially higher than that offer advantages reducing required to remove pollutants. The electrical supplied into discharge used preferentially create energetic then produce radicals dissociation ionization carrier present. These decompose There two technologically promising techniques for generating non-thermal atmospheric pressure containing pollutants, namely electron beam irradiation techniques. Both undergoing intensive continuous development worldwide. This done reduce requirement pollutant removal, therefore associated cost, well obtain better understanding physical processes involved In present only reviewed emphasis given more published work. summarizes reactions responsible removal major polluting constituents NO, NO/sub 2/ SO/sub encountered flue gases exhaust emissions. constructional features various types reactors commonly employed pilot systems industrial described briefly results on efficiency hydrocarbons volatile compounds their dependency type reactor, magnitude applied voltage (dc, ac pulsed), polarity (de effect pulse width, initial concentration addition ammonia, argon other hydrocarbons, flow rate, residence time temperature will reviewed. using arc discussed. specific density forms discharges expected one main considerations selecting technology it prime importance.