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Show Engineering Study The final phase of the program will include a detailed engineering study by B&W's commercial Environmental Equipment and Energy Services Divisions for the application of SNRB technology to one or more candidate commercial boilers. This study will provide infonnation needed to perfonn a detailed economic assessment of the SNRB process. This study will incorporate the results of the 5 MW e demonstration and filter fabric assessment tests. SUMMARY At baghouse operating temperatures of 8(Xt - 8S0·F, the laboratory pilot tests demonstrated that: • Particulate emissions less than 0.03 lb/million Btu are attainable with the NextelTh1 filter bags. • 90% NOx removal can be achieved at a NH3/NOx stoichiometry of 0.95 - 1.05. NH:>fNOx stoichiometry is the primary parameter affecting NOx removal performance. Baghouse operating temperature appears to be of secondary importance. • 70 to 80% S02 removal can be achieved over a Ca(OHh/S02 stoichiometry range of 2.0 - 2.5. It appears that baghouse operating temperatures of 800' to 850°F are necessary to achieve acceptable S02 removal. Future testing will focus on assessment of alternative bag filter fabrics and S02 removal perfonnance with alternative sorbents. These two areas appear to present the greatest opportunity for reducing operating and capital costs associated with the SNRB technology. Construction of the 5 MW e SNRB demonstration facility is nearly complete and operation is expected to begin 10 in January 1992. Operation of this larger scale' facility will support continued efforts to commercialize the technology. Potential sites for a commercial demonstration of the technology are being pursued. ACKNOWLEDGMENTS The authors express their thanks to the U.S. Department of Energy (PETC), the Ohio Coal Development Office, and the Electric Power Research Institute for supporting the SNRB flue gas cleanup project. Additional thanks are due to Ohio Edison for their support of the 5 MW e field demonstration, 3M for supplying the NextelTht bags, and the Norton Company for supplying the SCR catalyst. The technical advice and encouragement offered by all of these organizations is also gratefully acknowledged. REFERENCES 1. Chu, P., Downs, W., and Holmes, A.R., "Sorbent and Ammonia Injection Upstream of a High-Temperature Baghouse," Environmental Progress, Vol. 9, No. 3, August 1990,pp. 149-155. 2. Chu, P., Kudlac, G.A., Wilkinson, J.M., and CorbeLL, R.W., "Simultaneous SOx/NOx/Particulate Removal in a High Temperature Baghouse - Clean Coal 2 Program Update," AFRC 1991 Spring Meeting on NOx Control, Developments, and Commercial Applications, March 1991, Hartford, CT. 3. Kudlac, G.A., Farthing, G.A., Szymanski, T., and Corbett, R.W., "SNRB Catalytic Baghouse Laboratory Pilot Testing," AIChE 1991 Summer National Meeting, August 1991, Pittsburgh, P A. 4. Wilkinson, J.M., et al., "5 MW e SNRB Demonstration Project," EPRI/EPA Ninth Symposium on the Transfer and Utilization of Particulate Control Technology, October 1991, Williamsburg, VA. |