Pulverized coal burner

Abstract

Slagging is prevented from occurring in a pulverized coal burner. A nozzle body 6, which is open to a furnace 1 and which injects pulverized coal together with primary air 14 transporting the coal to serve finally as combustion air, has an outer sleeve 8 and an inner sleeve 9 arranged in and coaxially of the sleeve 8. A fuel flow space 10 is formed between the sleeves 8 and 9. Straightening plates 29 are arranged on at least either of the sleeves 8 and 9 to project to the space 10 and extend axially of the nozzle body. The combustion air (primary air 14 ) carrying the pulverized coal passes through the space 10 and is injected.

1 . A pulverized coal burner comprising a nozzle body open to a furnace and through which pulverized coal is injected together with combustion air, said nozzle body comprising an outer sleeve and an inner sleeve arranged in and coaxially of said outer sleeve, a fuel flow space being formed between said outer and inner sleeves, straightening plates being provided on at least one of said outer and inner sleeves, said straightening plates projecting in said fuel flow space and extending axially of said nozzle body, said combustion air transporting the pulverized coal passing through said fuel flow space and being injected.