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71 Figure B -5. Typical RDF Processing Schematic' Other configurations may include additional separating equipment or exclude trommels, but the RDF generated is always shredded so that it is capable of being blown into a furnace. Although results vary with the processing configuration, in general, about 80 percent of the incoming waste stream is converted into RDF for the thermal process. An advantage of this system is in the removal of metals and other materials from the waste stream. While not all these facilities include this step in the processing line, those that do can realize revenue from the sale of recovered metal. For instance, at the North County Resource Recovery Project in West Palm Beach, Florida, the nominal 3,000 TPD facility removed and sold over 30,000 tons of ferrous metals in 2003, which represented over 3 percent of the weight of the incoming waste stream. With the removal of non - combustibles, the specific heat content of the RDF can be increased by 10 percent over the original MSW. 1.1.4 Refuse - derived Fuel /Fluidized Bed In this incineration process, MSW is shredded to less than four inches mean particle size (the same as with the RDF process described in 1.3.1 above) to produce the fuel (see Figure B -5) before it is blown into a bed of sand in a vertical cylindrical furnace. Hot air is also injected into the bed from below, and the sand has the appearance of a bubbling fluid as the hot air agitates the sand particles. Moisture in the RDF is evaporated almost instantaneously upon entering the bed, and organics burn out both within the bed and in the freeboard, the volume above the bed. Steam tubes are embedded within the bed, and a transverse section of boiler tubes captures heat from the flue gas exiting the furnace, as shown in Figure B -6. Source: generic. GBB/C08027 -01 B -8 August 15, 2008