Effect of Low-Temperature Pyrolysis of Shenfu Long-Flame Coal on Caking Properties of Coking Coal

Abstract

Pyrolysis of Shenfu long-flame coal at low temperature has been carried out in a tubular furnace to reduce the influence of the addition of non-caking coal on the caking property of coking coal. The influence of low temperature pyrolysis on the chemical composition and microstructure of Shenfu long-flame coal has been studied. Finally, the effect of low-temperature pyrolysis on the relative Giseeler fluidity and caking index has been investigated by mixing the Shenfu long-flame coal with Taozhuang fat coal in a certain proportion. The experimental results show that the active component content of Shenfu long-flame coal is slightly lower, while the inert component content increases slightly after low-temperature pyrolysis. The maximum mean reflectivity of Shenfu long-flame coal vitrinite group increases with the increase of final temperature of pyrolysis. The surface of long-flame coal tends to be dense and smooth, and the crystal structure of the Shenfu long-flame coal gradually changes to graphite crystal structure. Compared with the simple addition of long-flame coal to coking coal, adding long-flame coal after low-temperature pyrolysis can alleviate the weakening effect of adding non-cohesive material on the caking property of coking coal and therefore improve the quality of coke.