BURNER

摘要

PROBLEM TO BE SOLVED: To provide a burner which flexibly responds to various kinds of fuels while minimizing the replacement operation of the burner according to change in the kind of coal to be used.SOLUTION: The burner is equipped with: a fuel nozzle 5 which blows out powdery fuel carried by a carrier gas; an oxidizer supply pipe line 7 provided concentrically with the fuel nozzle to surround its outer circumference; and a cooling water pipe line 9 provided to surround the oxidizer supply pipe line. The leading end of the fuel nozzle 5 is formed so as to include a diameter extended portion 15 contacting with the inner surface of the leading end of the oxidizer supply pipe line and a plurality of oxidizer ejection holes 13 formed in the diameter extended portion. The fuel nozzle is supported in such a manner that it is inserted to and drawn from the oxidizer supply pipe line 7 in the axial direction, and a seal member (49) is interposed between the outer circumferential surface of the diameter extended portion 15 and the inner circumferential surface of the oxidizer supply pipe line 7.