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Estimate C-1iii lt is recommended that the progress of CFB technology be monitored closely and that this Reference Plant design be updated as major advances occur. Parallel efforts of FBC development E-5 are also ongoing with different versions of AFB technology. The applicability of the various designs with regard to load change, minimum load, emissions mitigation potential, combustor maximum size limitations, efficiency, and reliability should be evaluated, since each design has unique advantages. These developments should also be monitored, and comparisons made of commercial reference plant designs which are based on similar design criteria. E-6In October of 1987 the ongoing CUEA project was selected in the first round of the DOE Clean Coal Technology (CCT) DemonstrationProgram. Under the cooperative agreement between CUEA and the DOE, DOE participated in Phase 3: Operation.Over 4400 hours of operation were logged using low sulfur Colorado coals during acceptance tests which were completed in October, 1988. Performance testing began in March, 1989 and continued through March, 1991, during which high ash and high sulfur coals were tested.The project completed the scheduled testing program in March, 1991, after operating 15,707 hours. The size of the unit is such that it provided the last critical link between small test facilities and commercial size plants.Data from 72 tests performed on the unit showed that both SO 2 and NO x emissions were below the permit level limits of 0.4 and 0.5 lb/106 Btu respectively. Combustion efficiency ranged from 96.9% to 98.9% and boiler efficiency varied between 85.6% and 88.6%. Three coals were tested. No significant operating problems were experienced but a ten week outage occurred due to the . structural damage to water'walls when one combustion chamber overheated. Few materials-related problems were encountered during the four years of operation and a reliability monitoring database was initiated to provide data on frequency of failure for equipment components. 2-1

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2-4 2.3.1 Equilibria of calcium sulfite and calcium sulfate with their hydrates 2-6 e e oeeloeeeeeeteoa, eeooo e eoeeoee_ ooe eeeoeoe'*." o 2.3.2 Equilibria between SO 2 and calclum-based sorbents ..