Combustion apparatus.

摘要

A combustion system provided with a mixture supply tube through which a mixture of pulverized coal and combustion air flows. The mixture is injected into a furnace through the mixture supply tube, and ignited. A flame holding ring which is flared radially outwardly is provided at the forward end portion of the mixture supply tube. The flame holding ring is held under a reducing atmosphere and exposed to high temperature caused by radiant heat from the furnace. With this arrangement, there are possibilities of burning of the flame holding ring and growth of slag on the flame holding ring. To prevent these problems, a projecting body is extended beyond the flame holding ring in the furnace, radiation of heat to the flame holding ring from the interior of the furnace is suitably shut off and excessive temperature rise is prevented. Combustion air is caused to flow on the surface of the projecting body to thereby keep the projecting body under an oxidizing atmosphere. A pulverized coal/air separating member is extended through the mixture supply tube. Portions where the flows are forcedly delaminated are locally provided on a conical portion at the forward end of the pulverized coal/air separating member. With this arrangement, stabilized combustion in the combustion system as a whole can be attained regardless of the unit capacity or the load of the combustion system.