Raman Spectroscopy and X-ray Diffraction Analysis of the Structural Characteristics of Fluidized Bed Gasification Fly Ash

Abstract

Previous experiments using thermo-gravimetric analysis (TGA) concluded a high carbon fly ash obtained from a circulating fluidized bed (CFB) gasifier by firing an anthracite coal to be less reactive compared to other high ash content chars that were prepared under laboratory conditions in a drop tube furnace (DTF) from a parent bituminous coal. This fly ash had internal surface (BET) area and pore volume of an order of magnitude larger than the laboratory prepared chars and so a further investigation was carried out by determining the influence of the fly ash residence time (10–20 s) in the CFB on its structural ordering.