Study On The Slagging Characteristics And Mechanism Of Main Components In Coal Ash At High Temperature

For a long time, coal-fired boilers' fouling and slagging has been one of the problems that puzzled boilers which are not yet solved properly, and this problem endangers boiler's security, economical operation and equipment reliability. Ash's melting and slagging characteristics are the main factors that do harm to the function of boilers, which 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 fact, silicon dioxide, aluminum oxide, ferric oxide, calcium oxide and sodium oxide are the main components of coal ash that influence on fouling and slagging. In this paper, slagging characteristics and mechanism are studied from another point of view, with silicon dioxide, aluminum oxide, ferric oxide, calcium carbonate and sodium carbonate substituted for ash compositions to get rid of disturbance. Compositions and contents of factitious ash, ambience and temperature are manual controlled; XRD, SEM test methods and shear resistance of the slag specimen are employed.