Understanding the effect of coke microstructure upon coke quality using imaging and modelling tools

We present preliminary work that examines the effect of components of the coke microstructure, such as voids, inerts and microfissures, upon the strength and reactivity of the coke. Using imaging of coke samples, we obtain sample information about coke microstructure, including identification of most features of the void space as well as location, size etc of inerts and microfissures. We use a 3D finite element model to calculate mechanical properties and locations of stress concentration within the structure, giving an identification of the coke strength. We also calculate gas permeability, which is an important determinant of the coke reactivity. We use a modelling approach to understand the effects of size, shape and distribution of the individual components in the coke on the strength and permeability of the coke, in order to better understand their effect on coke quality. Ultimately, we wish to relate these back to the properties of the coal charge.