Combustion burner, solid-fuel-combustion burner, solid-fuel-combustion boiler, boiler, and method for operating boiler

Abstract

Provided is a combustion burner including: a fuel nozzle ( 51 ) that is able to blow a fuel gas obtained by mixing pulverized coal with primary air; a secondary air nozzle ( 52 ) that is able to blow secondary air from the outside of the fuel nozzle ( 51 ); a flame stabilizer ( 54 ) that is provided at a front end portion of the fuel nozzle ( 51 ) so as to be near the axis center; and a rectification member ( 55 ) that is provided between the inner wall surface of the fuel nozzle ( 51 ) and the flame stabilizer ( 54 ), wherein an appropriate flow of a fuel gas obtained by mixing solid fuel with air may be realized.

1 . A combustion burner comprising:
 a fuel nozzle that is arranged to blow a fuel gas obtained by mixing solid fuel with air;   a secondary air nozzle that is arranged to blow air from the outside of the fuel nozzle;   a flame stabilizer that is provided at a front end portion of the fuel nozzle so as to be near an axis center side of the fuel nozzle; and   a rectification member that is provided between an inner wall surface of the fuel nozzle and the flame stabilizer.   
     
     
         2 . The combustion burner according to  claim 1 ,
 wherein the rectification member is disposed so that a front end thereof in the fuel gas flowing direction terminates downstream of a front end of the flame stabilizer in the fuel gas flowing direction.   
     
     
         3 . The combustion burner according to  claim 1 ,
 wherein the flame stabilizer is disposed so that a front end thereof in the fuel gas flowing direction terminates downstream of a front end of the rectification member in the fuel gas flowing direction.   
     
     
         4 . The combustion burner according to  claim 1 ,
 wherein the rectification member is disposed so as to have a predetermined gap with respect to the flame stabilizer.   
     
     
         5 . The combustion burner according to  claim 1 ,
 wherein the rectification member is provided so that a distance between the rectification member and the flame stabilizer is substantially uniform in the fuel gas flowing direction.   
     
     
         6 . The combustion burner according to  claim 1 ,
 wherein a widened portion is provided at the downstream side of the flame stabilizer in the fuel gas flowing direction and a tapered portion is provided at the downstream side of the rectification member in the fuel gas flowing direction.   
     
     
         7 . The combustion burner according to  claim 1 ,
 wherein a widened portion is provided at the downstream side of the flame stabilizer in the fuel gas flowing direction, and the rectification member is provided at a position where the rectification member does not face the widened portion.   
     
     
         8 . The combustion burner according to  claim 2 ,
 wherein the rectification member is provided along the inner wall surface of the fuel nozzle.   
     
     
         9 . The combustion burner according to  claim 1 ,
 wherein the flame stabilizer is formed in a structure in which a first flame stabilizing member disposed in a first direction and a second flame stabilizing member disposed in a second direction are disposed so as to intersect each other.   
     
     
         10 . The combustion burner according to  claim 9 ,
 wherein the first flame stabilizing member and the second flame stabilizing member respectively include a plurality of flame stabilizing members, a plurality of the first flame stabilizing members are disposed in the second direction with a predetermined gap therebetween, a plurality of the second flame stabilizing members are disposed in the first direction with a predetermined gap therebetween, and the plurality of first flame stabilizing members and the plurality of second flame stabilizing members are disposed so as to intersect each other.   
     
     
         11 . The combustion burner according to  claim 9 ,
 wherein a width of downstream portions of the first flame stabilizing members is larger than that of the second flame stabilizing members in the second direction.