PURPOSE: To enable execution of stable combustion in a wide range of the load and to prevent the occurrence of slagging by installing a flame stabilizer with a stepped part the cross section of which is increased and at the stepped part with a pressure introduction part to regulate an air flow at a pulverized coal particle residing part in the vicinity of a burner outlet at the tip part of a pulverized coal feed pipe.
CONSTITUTION: A flame stabilizer 3 having a stepped part to increase the cross section of a pulverized coal feed pipe 14 is increased is formed to the tip part on the furnace 1 side of the pulverized coal feed pipe 14. A small amount of working gas in the flame stabilizer 3 is introduced through a working gas introduction pipe 6 to a working gas head 15 and the size of the circulating area of pulverized coal particle on the downstream side of the flame stabilizer 3 is controlled by a control device 11. This constitution automatically copes with a change in a combustion load and a kind of coal. Further, the inner surface temperature of the flame stabilizer 3 is monitored by a temperature measuring system 17 and control is made by a flow rate regulating valve 9 so that ash is prevented from being fused and adhered (slagging) to the flame stabilizer 3.
OKIURA KUNIO
MORITA SHIGEKI
