Shigeharu MATSUURA* and Takehiko INADA**

(*No.1 Designing Section Enviromental Engineering Dep. Mitsubishi Heavy Industries, LTD
**Planning Section Enviromental Plant Engineering Dep. NKK Corporation)

Abstract

Various noxious gases are discharged from a refuse incineration plant, such as dust, sulphur oxide, hydrogen chloride, and nitrogen oxide. They are controlled by applicable regulations. This paper discuses in brief where the present techniques to treat such gases new stand, how new gas removal technologies are being put into practical use and what the future prospects of new technology development are.

For dust removal, the electrostatic precipitator and other various mechanical dust collectors are discussed, For removal of hydrogen chloride and surfur oxide, various methods, categorized into dry, semi dry, and wet type, are introduced. For removal of nitrogen oxide, the combustion control method, non-catalytic reduction method, and catalytic reduction method are discussed.

Recent moves for improvement of flue gas treatment techniques are directed at the research and development of more efficient removal of dioxins and heavy metals as well as the above mentioned noxious gases which aim at the realization of those efforts. In addition, an ideal flue gas treatment facility is being considered in the discussion of future research and development of the bag filter system and other processes.

Key words: gas treatment, harmful gas, noxious gas