25. Prediction of recycling ash and volatile elements in char recycling line of an entrained bed gasifier

Abstract

The behavior of recycling ash and volatile elements in char recycling line of an entrained bed gasifier were predicted by FactSage/Aspen Plus/ChemAPP computer packages. The accuracy of the prediction was above practical level. B, Cl, Cu, F, K, P, S, V, and Zn were sensitive elements in the gasifier. B, Cl, Cu, F, K, P, Ti, and Zn elements were enriched in recycle line. It is important to monitor the composition of recycled ash. If the gasifier operates for a long time, the concentrations of Zn, Cl, F and B will become high level.