NOVELTY - A gasification processing system uses gasifying gas delivered from a gasification facility (1) as a raw material to a gas utilization installation (2). The gasification facility consists of a gasifier having a raw-material introducing portion (1a), a gasifying-agent introducing portion (1b), and a gas delivery portion. A gas-treatment portion having either a dust collector for dust-removal, a cooler, or a purification device is provided. Reflux path (R1) is branched from the gasifying-gas supply flow path (L1) to the gas utilization installation.    USE - System is used for gasification processing of organic raw materials (claimed), such as biomass, wood chips, and sewage sludge in methanol synthesis process, dimethyl ether synthesis plants, and liquefied petroleum gas synthesis plants.    ADVANTAGE - The gasification system is energy-efficient, and ensures safety, operativity and stability.    DETAILED DESCRIPTION - A gasification processing system uses gasifying gas delivered from a gasification facility as a raw material supplied to a gas utilization installation having a synthesis reaction installation, gasification power generation equipment, and/or a combustion installation. The gasification facility consists of a gasifier having a raw-material introducing portion, a gasifying-agent introducing portion, and a gas delivery portion. A gas-treatment portion having either a dust collector for dust-removal, a cooler, or a purification device is provided. Reflux path is branched from the gasifying-gas supply flow path to the gas utilization installation from the gasification facility, and a portion of gasifying gas is refluxed to gasification facility through controlling valve (V1). Reflux path (R2) is branched from the flow path (L2) where consumption gas is delivered from the gas utilization installation, and a portion of consumption gas is refluxed to gasification facility through controlling valve (V2). The controlling valves are operated so that the reflux paths are selectively connected with the gasification facility. A controller is provided for controlling such that a portion of gasifying gas and/or consumption gas is supplied as the purging fluid of the flow path in the gasification facility, and the backwashing fluid of the dust collector. An INDEPENDENT CLAIM is included for gasification processing method, which involves, in gasification facility, gasifying organic type raw materials, such as biomass, with the supplied gasifying agent, gas-treating by cooling, dust-removal or purification with respect to gasified gas as required, synthesizing methanol, dimethyl ether, etc. by using the gasifying as a raw material, and/or burning and utilizing the off gas emitted in the synthesis reaction process, or gasifying gas, selectively supplying a portion of gasifying gas, off gas, or waste gas emitted in the utilization process, and purging or backwashing the flow path and installation used in the gasification process or gas-treatment process.    DESCRIPTION OF DRAWING(S) - The drawing shows a block diagram of the gasification processing system. (Drawing includes non-English language text)    Gasification facility (1)    Raw-material introducing portion (1a)    Gasifying-agent introducing portion (1b)    Gas utilization installation (2)    Headers (H1,H2)    Flow paths (L1,L2)    Pressure-rise unit (P1)    Pressure-reduction unit (P2)    Reflux paths (R1,R2)    Controlling valves (V1,V2)