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煤灰相变与其机理的分析.pdf 64页

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华 中 科 技 大 学 硕 士 学 位 论 文 Abstract For a long time,melting and slagging characteristics of coal ash are the main factors that do harm to the function of boilers, which endanger security, economical operation and equipment reliabilityof boiler. The coal ash fusibility has been studied in many different ways by many researchers, such as changing the kind of coals, admixture of different coals and affiliating minerals in the ash of coal. Because there are so many kinds of coal in our country and every one kind of coal contains a great deal of minerals which bring out many interferences factors to the mechanism of slagging, research on this field is not very easy. In this paper, three kinds of coal ash and three kinds of fluxes FeS 、Na O、CaO were 2 2 selected, then the fluxes were separately added into the ash. The paper studied the fusibility, and furtherly the fusion mechanism of six coal ash with thermal analysis, X -ray diffraction and Scanning electron microscope. The results of this paper were as following : 1. To begin with,Studied the fusibility of six coal ash with differential scanning calorimetry and thermogravimetry and analyzed the causes of formation of characteristic peaks on the DSC 、DDSC curves. Endothermic and weightlessness bring by resolution of carbonate and sulphate of coal ash lead to changes of TG -DSCcurves ,while the temperature range where phase transitions happen can be judged by observation of DDSC curves. The ash melt point of the three ash can be judged through TG -DSC curves is on the basis of distince content of Kaolinic in different coal ash. The other three coal ash added three fluxes which react

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