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The highlights of the fluidized-bed coal combustion program at Argonne National Laboratory are described. Studies of the regeneration of sulfated limestone were conducted using the Laboratory's process development unit. The effects of operational variables on the regeneration process were investigated. The conditions which lead to agglomeration of the partially sulfated limestone and coal in the regenerator, and therefore defluidization, were established. Cyclic sulfation-regeneration studies were made on Greer limestone, and the overall economic feasibility of regeneration was studied. Laboratory TGA measurements at high temperatures were used to predict the performance of several limestones at the high temperatures used in carbon burnup cells; a significant SO/sub 2/ reactivity was predicted. The mechanism of the process by which NaCl enhances the SO/sub 2/ reactivity of limestone was established. The effectiveness of various clay minerals, silica gel, and activated bauxite for the removal of gaseous alkali metal compounds from a hot gas stream was measured. The results of studies of the filtration efficiencies of granular-bed filters for the removal of dust from the flue gas generated with a pressurized fluidized-bed combustor are reported. Two commercial light-scattering particle analyzers were tested, using the flue gas from the PFBC. The status of the design ofmore » the Component Test and Integration Unit (CTIU) is described. The CTIU is a pressurized fluidized-bed coal combustion test rig (3 megawatts) designed to allow various combustor configurations to be easily assembled and tested.« less |
