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 guide member that is provided at a front end portion of the fuel nozzle and is arranged to guide the fuel gas flowing through the fuel nozzle toward the axis center side of the fuel nozzle,   wherein the guide member is disposed between an inner wall surface of the fuel nozzle and the flame stabilizer.   
     
     
         2 . The combustion burner according to  claim 1 ,
 wherein the guide member is disposed along the inner wall surface of the fuel nozzle.   
     
     
         3 . The combustion burner according to  claim 1 ,
 wherein the guide member is disposed so as to face the flame stabilizer.   
     
     
         4 . The combustion burner according to  claim 1 ,
 wherein the guide member is disposed at a position where the guide member faces the inner wall surface of the fuel nozzle in the flame stabilizer.   
     
     
         5 . The combustion burner according to  claim 1 ,
 wherein the guide member is disposed at the upstream side of the flame stabilizer in the fuel gas flowing direction.   
     
     
         6 . The combustion burner according to  claim 1 ,
 wherein the flame stabilizer is formed in a structure in which at least two first flame stabilizing members provided in a first direction while being parallel to each other in the second direction with a predetermined gap therebetween and at least two second flame stabilizing members provided in a second direction while being parallel to each other in the first direction with a predetermined gap therebetween are disposed so as to intersect one another, and the guide member is disposed at the outside of the intersection position of the first flame stabilizing members and the second flame stabilizing members.   
     
     
         7 . The combustion burner according to  claim 1 ,
 wherein the flame stabilizer includes a widened portion formed at the downstream side in the fuel gas flowing direction, and the guide member is disposed so as to face the widened portion.   
     
     
         8 . The combustion burner according to  claim 1 ,
 wherein the guide member includes at least two flame stabilizing members that are provided in the first direction while being parallel to each other in the second direction with a predetermined gap therebetween, and the guide member is provided so that the front end portions of the flame stabilizing members face the axis center side of the fuel nozzle.