PULVERIZED FUEL COMBUSTION BURNER, BOILER, AND PULVERIZED FUEL COMBUSTION METHOD

摘要

PROBLEM TO BE SOLVED: To provide a pulverized coal fuel combustion burner to perform combustion of crushed coal through direct feed and to provide a boiler provided with the burner. SOLUTION: This burner comprises a pulverized coal conveyance line 9; an ultra thick A/C mixture compartment 14 to jet pulverized coal mixture fed through the line; an ultra thin A/C mixture compartment 15; and an auxiliary air compartment 16, and the devices respectively individually jet a plurality of kinds of fed pulverized coal mixtures different in concentration. In a so formed pulverized fuel combustion burner, pulverized coal mixture fed to the vicinity of a connection part between an ultra thick A/C mixture nozzle pipe 114b of the ultra thick A/C mixture compartment 14 to jet high concentration pulverized coal mixture and the pulverized coal conveyance line 9 is blown in a tangential direction with the cross section of the ultra thick A/C mixture nozzle pipe 114b, and a speed regulation damper to regulate a blow speed is provided.