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 c oal combustion and the mechanism of flame stabilization of low-volatil e pulverized coal by the bluff-body burner, a new principle is present ed that improves ignition and flame stability of low-volatile pulveriz ed coal. For example, some methods separate the low-volatile pulverize d coals from primary air just after they enter the combustion chamber and concentrate them around the boundary and inside of the recirculati on region where favourable conditions are created for the volatile con tents to be released and matched with the ambient air. According to th is principle a new kind of burner, called a slitted bluff-body, is inv ented, with which it is easier to ignite low-volatile pulverized coal and to stabilize and intensify the flame.