気流層石炭ガス化炉における飛散スラグ粉の焼結特性 : 第2報, 実験室規模におけるガラス質スラグの作製条件

概要

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In our previous study, it was found that amorphous slag had the lowest sintering temperature among the flying slag particles in entrained bed gasifiers, and this temperature should be of great importance for designing a gasifier without slag sintering problems. In this paper we describe how to produce amorphous slag not in pilot scale tests but in a laboratory. Ash in a graphite crucible with a plug was heated and melted at between 1400 and 1700℃, and then the molten slag was quenched in a water bath. The amorphous slag can be made by heating at approximately 100℃ above the ash fluid temperature. The sintering temperature was almost the same as that of the amorphous slag obtained from a gasification pilot plant. This plant was designed to gasify 50 tons of coal per day. Although Fe in the ash heated to over 1650℃ was reduced and separated from the slag, XPS (X-ray photoelectron spectroscopy) analysis showed that oxidized Fe existed at the surface, while a mixture of oxidized Fe and metallic Fe existed approximately 60nm below from the surface of the laboratory slag. The Fe distribution in the slag was confirmed to be the same as that for the amorphous slag obtained by coal gasification.
社団法人日本機械学会の論文
1996-10-25