Powder fuel burner

Abstract

A powder fuel burner mounted in a combustion chamber of a boiler includes: a cylindrical air-fuel mixture conveying tube, through which an air-fuel mixture is conveyed and which injects, from a distal end thereof, the air-fuel mixture into the combustion chamber, the air-fuel mixture being a mixture of a powder fuel and conveying air; a swirl vane mounted at the distal end of the air-fuel mixture conveying tube; and a rod-shaped center flow blocker mounted on a center axis of the air-fuel mixture conveying tube at a position upstream of the swirl vane in a conveying direction of the air-fuel mixture, the center flow blocker including a cylindrical surface that is concentric with the air-fuel mixture conveying tube and that extends in a direction of the center axis.

1 . A powder fuel burner mounted in a combustion chamber of a boiler, the powder fuel burner comprising:
 a cylindrical air-fuel mixture conveying tube, through which an air-fuel mixture is conveyed and which injects, from a distal end thereof, the air-fuel mixture into the combustion chamber, the air-fuel mixture being a mixture of a powder fuel and conveying air;   a swirl vane mounted at the distal end of the air-fuel mixture conveying tube; and   a rod-shaped center flow blocker mounted on a center axis of the air-fuel mixture conveying tube at a position upstream of the swirl vane in a conveying direction of the air-fuel mixture, the center flow blocker including a cylindrical surface that is concentric with the air-fuel mixture conveying tube and that extends in a direction of the center axis.   
     
     
         2 . The powder fuel burner according to  claim 1 , further comprising:
 a cylindrical peripheral flow blocker mounted along an inner wall surface of the air-fuel mixture conveying tube, the peripheral flow blocker including a cylindrical inner peripheral surface that faces the cylindrical surface of the center flow blocker and that is spaced apart from the cylindrical surface of the center flow blocker by a predetermined distance.   
     
     
         3 . The powder fuel burner according to  claim 2 , further comprising:
 an internal cylinder that is concentric with the air-fuel mixture conveying tube and that is, at the distal end of the air-fuel mixture conveying tube, mounted inside the air-fuel mixture conveying tube, wherein   the swirl vane is located inside the internal cylinder.   
     
     
         4 . The powder fuel burner according to  claim 1 , wherein
 the powder fuel is a petroleum residue fuel, a biomass fuel, or a mixed fuel of biomass and pulverized coal.