Orange County NC Website
Browse       Search
74 <br />Superheated Stem Neater <br />600— <br />40VC <br />Fhulized-bed <br />Gasifier <br />Wastes <br />�Q 00 C <br />NDE]D <br />s <br />x <br />Econonm Air Bag Filter <br />l ,c QQ 1,44Q�C: I Preheater t� <br />' Waste heat moiler <br />mlaustxbles Molten Slag <br />Figure B -8. RDF Fluidized Bed Gasification System" <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 B -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 />io Source: Ebara Corporation, Tokyo. <br />GBB/CO8O27 -01 B -11 August 15, 2008 <br />