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 solid-fuel-combustion burner that is used in a burner portion of a solid-fuel-combustion boiler for inputting pulverized solid fuel and air into a furnace, the solid-fuel-combustion burner comprising:
 a fuel burner arranged to input pulverized fuel and primary air into the furnace; and   a secondary air port arranged to input secondary air from the outer periphery of the fuel burner,   wherein a cross type split member obtained by intersecting a plurality of inner flame stabilization members in a plurality of directions is disposed at a front side of a passage of the fuel burner, and the width of the split member is different for each direction.   
     
     
         2 . The solid-fuel-combustion burner according to  claim 1 ,
 wherein three or more cross type split members are disposed in at least one of a first direction and a second direction, and the center portions thereof in at least one of the first direction and the second direction are wide.   
     
     
         3 . The solid-fuel-combustion burner according to  claim 2 ,
 wherein the cross type split members are wider in the first direction than in the second direction.   
     
     
         4 . The solid-fuel-combustion burner according to  claim 2 ,
 wherein the cross type split members are wider in the second direction than in the first direction.   
     
     
         5 . A solid-fuel-combustion burner according to  claim 1 , the secondary air input port that ejects secondary air from the outer periphery of the fuel burner,
 wherein the fuel burner functions as an inner flame stabilization and the secondary air port does not function as a flame stabilization, and a shielding member is provided in at least one position of the intersecting corners formed by the intersection of the split members.   
     
     
         6 . The solid-fuel-combustion burner according to  claim 1 ,
 wherein at least an end portion of the cross type split member in any one direction of a plurality of directions is removed.   
     
     
         7 . A solid-fuel-combustion boiler comprising a solid-fuel-combustion burner according to  claim 1  disposed at a corner or a wall surface inside a furnace. 
     
     
         8 . The solid-fuel-combustion boiler according to  claim 7 , further comprising an additional air port/unit for inputting an additional air downstream of the furnace,
 wherein the air is divided into the secondary air port and the additional air port/unit so as to perform a low NOx combustion.