低温プラズマによる排ガス中のＮＯｘ除去

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  • NOx Removal from Flue Gases Using Non-Thermal Plasma
  • テイオン プラズマ ニ ヨル ハイガス チュウ ノ NOx ジョキョ

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Air pollution caused by gas emission of pollutants produced from a wide range of sources including coal, oil and gas burning power plants, diesel engines, paper mills, steel and chemical production plants must be reduced drastically and urgently, as mandated by recent worldwide nation legislation which recently are being reinforced increasingly by international agreements. Non-thermal plasma in which the mean energy of electrons is substantially higher than that of the gas offer advantages in reducing energy required to remove the pollutants. The electrical energy supplied into the discharge is used preferentially to create energetic electrons which are then used to produce radicals by dissociation and ionization of the carrier gas in which the pollutants are present. These radicals are used to decompose the pollutants. There are two technologically promising techniques for generating non-thermal plasmas in atmospheric gas pressure containing the pollutants, namely electron beam irradiation and electrical discharge techniques. Both techniques are undergoing intensive and continuous development worldwide. This is done to reduce the energy requirement for pollutant removal, and therefore the associated cost, as well as to obtain a better understanding of the physical and chemical processes involved in reducing the pollutants. In the present paper only electrical discharge techniques for NOx removal from flue gases and exhaust emissions are reviewed. This paper summarizes the chemical reactions responsible for the removal of the major polluting constituents of NO and NO2 encountered in the flue gases.

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