The effect of binder (coal tar and pitch) on coking pressure

摘要

In order to develop a technology for reducing coking pressure, the effect of the addition of binder (coal tar and pitch) on coking pressure was investigated from the viewpoint of plastic coal layer permeability, internal gas pressure generated in a pilot scale oven and coke quality. We also studied the selective addition of binder to high coking pressure coal as a method to decrease coking pressure effectively. In the plastic coal layer permeability experiment, the addition of binder greatly decreases Delta P-max of high coking pressure coal HP and fine solid binder reduces Delta P-max more than coarse solid binder. The addition of binder decreases internal gas pressure and the finer the particle size of solid binder is, the smaller the internal gas pressure becomes. Moreover, in the case of the same addition ratio of binder, the selective addition of binder to high coking pressure coal can reduce coking pressure more effectively than the uniform addition. The addition of binder to coal blend is promising in the point that it can improve coke quality as well as reduce coking pressure.