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superheated St= Heater <br />40000 <br />Fluidized bed <br />1,300-1,4001C <br />500-600V <br />Nan combust]es Molten slag <br />I StUMTUNne ' <br />Econonuzer Air Bag Filter <br />Preheater <br />LJ <br />Figure B-S. RDF Fluidized Bed Gasification Systernlo <br />Although this system is described as gasification technology, it does not export a <br />burnable gas. RDF is first prepared using a process similar to the ones illustrated in <br />Figures B-4 and B-5. The RDF (called "wastes" in Figures B-7 and 13-8) is then <br />charged to the fluid bed and the gas generated is directed to a secondary <br />combustion chamber, shown above, with molten slag dropping out to a water-cooled <br />sump. The molten slag solidifies into a glass-like material which can be used as a <br />construction material or fill. Heat from the gas fired in the combustion chamber is <br />captured in hot water tubes to generate steam which can be used for electric power <br />generation. Without the generation of a usable gas stream and with the necessity of <br />a combustion chamber for gas burn-out, this system is an incinerator. <br />A gasifier marketed for MSW is built by EnTech of Devon, England, as shown in the <br />schematic in Figure B-9. This is a complex system which generates recyclable <br />metals, plastics and other potential revenue streams, in addition to a salable gas <br />(syngas). EnTech provides case studies of nine small-scale facilities in operation. A <br />67 TPD facility operates on a mixture of MSW. <br />10 source: Ebara Corporation, Tokyo. <br />GBB/C08027-01 B-11 August 15, 2008 <br />