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Predicting Slagging/Fouling Propensities of Solid Fuels with the Aid of Experimental and Modelling Techniques

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Płaza P. , Ferens W. , Griffiths A. J. , Syred N. , Rybak W.

tom Vol. 30 nr 3

203-213

A thermo-dynamic model (based on FACTSage) has been used to predict the ash behaviour of coals under the high temperature conditions existing in the pf boilers. The predicted melting characteristics have been compared with the experimental data derived from the standard ash fusion test and non-standard sintering test. Good agreement has been achieved between predicted liquid phase formation as a function of temperature and the ash fusion temperatures measured according to standard test. Based on the amount and composition of the predicted molten phase, the viscosity of the slags has been calculated and compared with the measured sintering tendency of the investigated ashes. It has been shown that the sintering tendency correlates quite well with the calculated viscosities for the types of investigated ashes. This confirmed that viscous flow and a presence of the liquid phase are dominant factors affecting the sintering of the ashes. The obtained results revealed that the thermo-dynamic model can be used to predict the ash fusion temperatures and the sintering tendency of ashes, thus the strength of deposits can be assessed which is of relevance for predicting slagging/fouling propensities of solid fuels.