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- W178471116 abstract "The behavior of coal mineral matter is of interest in fluidized-bed coal gasification and stage combustion because it governs the formation of ash agglomerates that facilitate ash removal from the reactor without excessive loss of carbon as well as deposition on reactor internals and downstream surfaces. The ultimate aim of this research program is to be able to predict quantitatively the behavior of the mineral matter in a fluidized-bed gasifier based on the operating conditions of the gasifier and a minimum analysis of the mineral matter present in the coal feed. In this work, the effects on ash behavior of using limestone as an in-bed sulfur capture agent and of recycling an SO{sub 2}-containing stream from the regeneration of a hot-gas cleanup system to the gasifier were investigated. The feed solids, ash discharge, and bed material from a pilot plant test in which limestone was used for sulfur capture were analyzed. Also, tests in a 2-in. ID reactor in which mixtures of limestone and coal char were gasified with steam and air, with and without the addition of SO{sub 2} to the feed gas, were studied. The results indicate that very few conventional coal ash agglomerates were formed, but insteadmore » the coal ash became attached to and penetrated the particles containing calcium oxide and calcium sulfide that were formed from the limestone. Sulfur dioxide recycled to the bed was reduced to hydrogen sulfide and absorbed as calcium sulfide with little, if any, other effect on ash behavior. 4 refs., 2 figs., 3 tabs.« less" @default.
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- W178471116 date "1990-01-01" @default.
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- W178471116 title "The effect of limestone on ash behavior in fluidized-bed gasification of coal" @default.
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