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Show o Dependability of Tire Supply Since the scrap tire is a headache ior solid disposal, it may be possible to operate an FBC tire incinerator by collecting a fee, or simply by accepting scrap tires from the dealer. However, in a free market society competition for tire burning may force the scrap tire price up. Should the scrap tire supply become a problem, conventional coal may be used as a fuel supplement. o Pollutant Control Pilot plant and industrial scale FBC boilers have demonstrated that high-sulfur coal can be burned in an environmentally acceptable manner. Chemically, tires and coal are very much alike so that, aside from the presence of zinc oxide, we do not expect unusual environmental problems in the FBC of scrap tires. o Product and By-Product Markets The major product of FBC of tires is heat for processes or space heating in the form of steam or hot air. However, moderate to high-pressure steam could also be generated from a tire-burning FBC boiler and used to supply mechanical power (blowers or compressors) and/or electric power generation. The major solid by-products are steel, glass, carbon black, and zinc oxide, ZnO for which markets exist. 1 The Future of Scrap Tire Disposal This year, 1.2 million tires will be discarded in Fairfax County, VA; 770 thousand passenger tires, 260 thousand truck tires, and 140 thousand farm machine tires. This amounts to the equivalent of 62 thousand barrels of crude oil "stored" in Fairfax County. Ironically, in 1980 some of the schools in Fairfax County were closed down because of the shortage of heating fuels, and business hours were reduced to conserve fuel. In the meantime, the equivalent of 62 thousand barrels of fuel was simply discarded. It would not be an exaggeration to say that many times that number of scrap tires are currently lying around in solid waste burying areas. When we checked with industrial fluidized-bed incineration people, we learned that at least two of them are currently conducting tire incineration development on their own initiative. These people agree that fluidized-bed combustion of scrap tires is feasible. According to our findings, a tire FBC boiler can pay for itself within 2 or 3 years. 11-33 |
