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- W1570867206 abstract "Laboratory test methods have been developed to measure the attrition and elutriation characteristics of limestones in an atmospheric-pressure fluidized-bed coal combustor (AFBC) at 850/sup 0/C. The attrition constant and elutriation rate were determined for a group of limestones when the system is assumed to be at steady state; that is, after sorbent breakup due to thermal shock and decrepitation during calcination of the sorbent feed are completed. An attrition model has been developed to analyze the laboratory data to predict sorbent performance in AFBCs. The attrition model assumes that the particle disintegration occurs from the abrasive removal of material from the surface of the particle rather than by particle fracture. The attrition constants of the limestones tested ranged from 1.5 x 10/sup -6/ sec/sup -1/ to 9.2 x 10/sup -8/ sec/sup -1/, and the elutriation rate had a fractional mass loss which ranged from 8.1 x 10/sup -8/ min/sup -1/ to 1.0 x 10/sup -3/ min/sup -1/. The test methods and techniques utilized by the model are undergoing refinement to improve the accuracy of the prediction. The attrition and elutriation of a sorbent in a fluidized-bed combustor affects the sorbent performance in a complex manner. The obvious case is themore » extreme situation where so much sorbent material is lost from the bed via attrition and elutriation that a constant bed height cannot be maintained. Because this aspect is an important consideration in sorbent selection, standard laboratory test methods have been developed to measure the attrition and elutriation characteristics of limestones in AFBCs.« less" @default.
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- W1570867206 date "1981-01-01" @default.
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- W1570867206 title "Natural-sorbent attrition and elutriation characteristics in fluidized-bed coal combustors" @default.
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