The Feature for The Gasifiers of Coal in Future

概要

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To convert coal into clean gases, various types of gasifier have been being developed.Recently, based on the requirement to attain both large throughput and high efficiency during gasification, there is a tendency that the temperatures in the gasifier, especially those in the char partial oxidation zone, rise, and sometimes they rise over the melting point of ash.To avoid the agglomeration of particles, the bed is stirred at a certain interval, or relatively high gas velocities are achieved in the fixed-bed gasifiers.Some attempts, such as distributor improvement and attainment of high temperature without ash agglomeration, are made for the fluidized-bed gasifiers.In the entrained-bed gasifiers, ash is melted to completely utilize the carbon contained in the coal.In this paper, the tendency to aim high gasification temperatures is summarized, and the methods to realize such high temperatures are discussed.
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