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Show INTRODUCTION The disposal of hazardous and non-hazardous wastes is a growing concern for both municipalities and industry. The declining availability of landfills and landfill disposal restrictions imposed by the 1984 Resource Conservation and Recovery Act (RCRA) has brought a heightened awareness of this issue to both the public and U.S. industry. While municipal waste is the most common, considerable amounts of chemical and biological wastes are produced by industrial, commercial, and agricultural activities. The petroleum industry alone, for example, disposes 850,000 wet tons of waste per year. Commercial activities also produce significant amounts of difficult to treat waste such as discarded automobile and truck tires. An important disposal and treatment alternative is the burning of wastes to generate electrical and thermal energy. Much of our industrial waste has sufficient heat content to sustain combustion. However, unlike conventional fuels, waste materials have irregular composition and widely varying heating values. Many fuels such as refinery wastes and industrial sludges often contain as much as 30 to 90% water. In addition, there is growing interest in adding recycling operations into waste-to-energy operations. Depending on which materials in the waste stream are recycled, the remaining material may be more or less difficult to incinerate. The expanding list of potential waste fuels, varying fuel properties, and mounting pressure for federal emission standards for resource recovery plants will require new and more advanced incineration technologies. This paper will discuss the applicability and potenial of a new combustion technology known as Multisolid Fluidized Bed Combustion (MSFBC) for the incineration of wastes. Advanced MSFBC systems are capable of burning a variety of fuels efficiently while meeting stringent emission standards. MSFBC PROCESS MSFBC is a circulating fluidized bed combustion process capable of operating at superficial gas velocities of up to 40 ft/sec. Its development was begun in 1974 by the Battelle Development Corporation(l). Early development efforts were also supported by the U.S. Department of Energy(2). In 1984, this technology was licensed to Riley Stoker Corporationi for the design, construction, and manufacture of industrial and utility boilers. Several industrial MSFBC coal-fired boilers have recently been constructed in both the U.S. and Japan(3). In Japan, MSFB boilers are supplied by Mitsui Engineering and--Shipbuilding Co., Ltd. under a license from Riley Stoker. 1 |
