NOVELTY - A purifier has an activated-carbon type adsorption apparatus (3) equipped with two or more activated-carbon adsorption layers (3a,3b). An adsorption apparatus (2) which adsorbs mist-form moisture content, tar of high-boiling-point hydrocarbon compound, dioxins, and solid dust contained in gasification gas, is provided at the front stage of the gasification-gas flow direction. The activated-carbon type adsorption apparatus is provided at the later stage of the adsorption apparatus.    USE - Purifier is used for purifying gasification gas (claimed) obtained by thermal-decomposition of solid organic matter, such as organic waste, waste plastic, biomass, and coal.    ADVANTAGE - The purifier efficiently removes dioxins and high-boiling-point hydrocarbon compounds contained in gasification gas, maintains purification capability over a long period of time, and steadily and economically provides high-calorie gasification gas.    DETAILED DESCRIPTION - A purifier has an activated-carbon type adsorption apparatus (3) equipped with two or more activated-carbon adsorption layers (3a,3b) in parallel. The adsorption apparatus is operated by changing between the activated-carbon layers. The substance adsorbed by letting the gas at 100 degrees C or more not containing oxygen is passed through the activated-carbon layer not used for absorption-and-removal, and adsorption performance is maintained. An adsorption apparatus (2) which adsorbs mist-form moisture content, tar of high-boiling-point hydrocarbon compound, dioxins, and solid dust contained in gasification gas, is provided at the front stage of the gasification-gas flow direction. The activated-carbon type adsorption apparatus is provided at the later stage of the adsorption apparatus.    DESCRIPTION OF DRAWING(S) - The drawing shows a block diagram of the purifier. (Drawing includes non-English language text)    Gasifier (1)    Adsorption apparatus (2)    Activated-carbon adsorption layers (2a,2b,3a,3b)    Activated-carbon type adsorption apparatus (3)    Gasification gas service main (4)