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- W314001044 abstract "To reduce the size and cost of an atmospheric-pressure fluidized-bed combustion (AFBC), a high superficial gas velocity (3 to 4.6 m/s) is required. However, high gas velocities cause high dust loadings (limestone and unburned coal) in the effluent gas stream. High gas velocities, therefore, produce low combustion efficiencies. Pope, Evans and Robbins (PER) have reported combustion efficiencies of approximately 85% at a fluidizing gas velocity of 3.8 m/s. To increase the overall combustion efficiency PER has incorporated into their process a carbon burnup cell (CBC) which operates at a higher temperature than the combustor and a lower fluidizing gas velocity (approximately 1100/sup 0/C, 1.8 m/s). Unburned coal dust removed from the combustor effluent stream by cyclones is injected into the CBC. Pope, Evans and Robbins estimate that the overall combustion efficiency can be increased to approximately 99%. The role of a carbon burnup cell in reducing limestone requirements to meet EPA SO/sub 2/ emission requirements for fluidized-bed coal combustor plants was investigated by evaluating laboratory scale experimental data. Four limestone feed options were analyzed. For Greer limestone the calculations predict that two of the options 2 and 4 would require approximately one-half as much limestone as the others. The reactivitiesmore » of Tymochtee dolomite and Germany Valley limestone with SO/sub 2/ were compared with that of Greer at identical conditions. Tymochtee dolomite is more reactive than Greer. Germany Valley, being a high-calcium limestone, has poor reactivity and with any of the limestone feed options would require high Ca/S ratios to meet the EPA SO/sub 2/ standard. Again, two of the options were more favorable for Tymochtee and Germany Valley stones.« less" @default.
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- W314001044 date "1977-01-01" @default.
- W314001044 modified "2023-09-27" @default.
- W314001044 title "Role of a carbon burnup cell in reducing SO/sub 2/ emissions from fluidized-bed coal combustion plants. [Evaluation of 4 limestone feed options]" @default.
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