Estimation of Coke Porosity Variation with Temperature during Carbonization

Abstract

The porosity of a packed bed of coals, which is transformed into coke during carbonization process, is estimated by taking the following phenomena into account:volume change by swelling and shrinking, gas production and weight loss of the coal during carbonization reaction.The porosity is determined by the apparent density of the packed bed of coal and true density of coal.Total amount and production rate of each gas are then determined experimentally for four bituminous coals which are heated at 0.042 and 0.083 K/s from the room temperature to 1 300 K.The porosity is measured by following JIS method for four bituminous coals which are heated at 0.05 K/s from the room temperature to arbitrary temperature above solidification point.The variation of estimated coke porosity with temperature agrees well with the experimental one.