Coking Pressure Control by Selective Crushing of High Coking Pressure Coal

Abstract

To control coking pressure is one of the most important aspects of the cokemaking process since excessive coking pressure increases the force needed for coke cake pushing and in some cases leads to operational problems such as hard pushes or stickers, causing wall damages. We investigated a selective fine crushing of high coking pressure coal as a way to reduce coking pressure. It was shown in a laboratory scale that fine crushing of high coking pressure coals increases permeability of the plastic coal layer, which decreases coking pressure (internal gas pressure). Based on the basic investigations, we tried fine crushing of high coking pressure coals at commercial cokemaking plants. It was confirmed in a long-term commercial scale experiment that fine crushing of high coking pressure coal decreases coking pressure and decreases maximum power current of coke pushing. A selective fine crushing of high coking pressure coal is a promising way to reduce coking pressure and to prolong coke oven life.