Identification of coal pyrolysis products by scanning electron microscopy

Abstract Scanning electron microscopy (SEM) is a useful method for studying coal pyrolysis products. Using SEM, coked macerals were recognized by flow patterns originating from the plastic stage. Reduced coking properties could be observed on oxidized coals. Particular attention was given to coal conversion products obtained under the heating conditions of fluidized bed combustion, because coke formation has an adverse effect on the process. SEM-results were in general agreement with optical data.