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pelletizing. Pelletizing is the compression of "fluff" RDF into dense pellets generally <br />to be fired along with lump coal. The pellet size depends on the size of the coal used <br />in existing power plants. <br />RDF production is a distinct process; therefore, it is not necessary to be co- located <br />with the combustion plant. In Figure B -4, RDF is blown into the furnace from the <br />left, above the grate. What does not burn in suspension (above the grate) will burn <br />on the grate, and the hot gases generated will pass through a waterwall section and <br />then a boiler section. This system is similar to the mass -burn waterwall facility <br />except in the nature of waste charging and burnout. <br />STEW <br />MR O Y <br />L_.`_.._ ... ` .... <br />_.J <br />Figure B -4. Typical RDF Combustion Fac11111ty6 <br />The unique feature of RDF systems is in the pre - processing of waste. As seen in the <br />diagram of a typical RDF processing facility in Figure B -5, MSW enters the facility and <br />then passes through a trommel, where bags of waste are broken open and large <br />material is removed. The small material dropping out of the first trommel passes <br />through a second trammel to remove fine noncombustible material. The majority of <br />waste goes through a shredder for size reduction. A magnetic separator removes <br />ferrous metals and the balance of the material is fired in the furnace. <br />6 Source: Energy Answers Corporation. <br />GBB/C08027 -01 B -7 August 15, 2008 <br />