BEHAVIOR OF BASIC ELEMENTS DURING COAL COMBUSTION

被引：76

作者：

HUFFMAN, GP ^{[1
]}

HUGGINS, FE ^{[1
]}

SHAH, N ^{[1
]}

SHAH, A ^{[1
]}

机构：

[1] UNIV KENTUCKY,CFFLS,LEXINGTON,KY 40506

来源：

PROGRESS IN ENERGY AND COMBUSTION SCIENCE | 1990年 / 16卷 / 04期

关键词：

Coal Combustion;

D O I：

10.1016/0360-1285(90)90033-Y

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

X-ray absorption fine structure (XAFS) spectroscopy, Mossbauer spectroscopy and computer-controlled scanning electron microscopy (CCSEM) have been used to investigate the reactions of Ca, Fe and alkalies in combustion systems. Ca may either transform to a CaO fume that reacts with SO2 to form CaSO4, or may react with clays, quartz and other minerals to form slag droplets, or flyash. Similarly, pyrite may devolatilize and oxidize exothermically to form molten or partially molten iron sulfide-iron oxide mixtures, or may react with other minerals to become part of the slag. Alkalies in lignites (principally Na) volatize and may react with either SO2 to form sulfates or with clay minerals (principally kaolinite) to form aluminosilicate slag droplets. K in bituminous coal is contained in illite which melts and becomes part of the slag phase. The calcium and alkali sulfates and the iron-rich species are observed to be concentrated in the initial layers of deposits, while the complex aluminosilicate slag droplets collect to form an outer glassy layer. © 1990.

引用

页码：243 / 251

页数：9

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