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Show Figure 16 shows the predicted solid temperatures with respect to gas temperatures for a noncontaminated soil with 10% moisture and co-current kiln flow. Conclusions The data indicated that several parameters affect the evolution and desorption rate of toluene from sorbent, but temperature appears to be most important. As the temperature was increased, the desorption rate increased and less contaminant remained in the solid. In the kiln there appeared to be more hydrocarbon combustion at higher temperatures. The concentration of contaminant did not appear to affect the desorption of contaminant, as shown in the Particle Characterization Reactor studies, but in the kiln environment, an increase in concentration increased the degree of combustion. The method of sorbent contamination and the time of contamination, 1 day versus 2 weeks, did not appear to influence the desorption rate. Charge size in the kiln seemed to influence only the heat transfer within the bed, as expected. Future work will explore the adsorption/desorption equilibrium characteristics of the sorbent so that modeling of the particle phenomena can be initiated. In addition, the Bed Characterization Reactor must be completed, data collected and a model generated before the kiln heat transfer model can be coupled with the bed models. Acknowledgements This work was sponsored by the Advanced Combustion Engineering Research Center. Funds for this Center are received from the National Science Foundation, the State of Utah, 22 industrials participants, and the U.S. Department of Energy. Funding from the National Science Foundation and the EPA, in conjunction with LSU, is appreciated, as well as the assistance of David Gordon in the gathering of the toluene/sorbent data.. References 1. Oppelt, E. T., "Incineration of Hazardous Waste: A Critical Review," JAPCA, 37: 558-586 (May 1987). 2. "CBO Study Examines Recent Changes & Policy Alternatives for Hazardous Waste Management,"JAPCA, 35 : 761-764 (July 1985). 3. Rhein, R.W. and J. Trewhitt,"Time has run out for land disposal facilities ," Chemical Engineering: 30- 32 (December 9, 1985). 4. Huffman, G.L.and L. J. Staley, "The Formation of Products of Incomplete Combustion in Research Combustors", Proceedings of the Twelfth Annual Research Symposium on Land Disposal, Remedial Action, Incineration , & Treatment of Hazardous Waste, EP N600/9-86/022 (August 1986). 5. Trenholm, A.R. and C.C. Lee, " Analysis of PIC and Total Mass Emissions from an Incinerator," Proceedings of the Twelfth Annual Research Symposium on Land Disposal, Remedial Action, Incineration, & Treatment of Hazardous Waste, EP N600/9-86/022 (August 1986). |
