A new principle of ignition and flame stability for low-volatile pulverized coal with slitted bluff-body burner

On the basis of analysing the lean flammability limits of pulverized coal combustion and the mechanism of flame stabilization of low-volatile pulverized coal by the bluff-body burner, a new principle is presented that improves ignition and flame stability of low-volatile pulverized coal. For example, some methods separate the low-volatile pulverized coals from primary air just after they enter the combustion chamber and concentrate them around the boundary and inside of the recirculation region where favourable conditions are created for the volatile contents to be released and matched with the ambient air. According to this principle a new kind of burner, called a slitted bluff-body, is invented, with which it is easier to ignite low-volatile pulverized coal and to stabilize and intensify the flame.