CONCENTRATION ADJUSTING RING FOR FINE POWDERED COAL BURNER

Japanese Patent JP3758742

B2

PROBLEM TO BE SOLVED: To more improve fine powdered coal concentration effect in a burner outer cylinder to the outside than the prior art, prevent a concentration adjusting ring itself and an internal peripheral surface of the burner outer cylinder from being worn and further prevent a fine powdered coal deposition layer from being formed.
SOLUTION: This concentration adjusting ring 26 is fitted to a burner inner cylinder 6 from the outside such that primary air 11 is forced to go around the outside in a burner outer cylinder 8 to concentrate fine powdered coal 10 to the outside. A flow passage contraction slope 27 located on the upstream side is build up at a first inclination angel α1 smaller than at least 20 degree or less with respect to an outer peripheral surface of the burner inner cylinder 6 and is build up in the cource thereof at a second inclination angle α2 larger than the first inclination angle α1 while being gradually deflected. Further, it is formed along the flow direction of the primary air 11 permitting the outer configuration of the top part thereof to draw a mild curved line, and a downstream flow passage extension slope 28 is formed into a flow line configuration extending continuously to the top of a flow passage contraction slope 27 such that the primary air 11 going around is prevented from forming turbulence and a spiral flow.

Makino Nao
Kimoto Masayoshi
Yoshihiko Endo
Shigehiro Miyamae

JP11549196A

March 22, 2006

April 12, 1996

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CENTRAL RESEARCH INSTITUTE OF ELECTRIC POWER INDUSTRY
Ishikawajima Harima Heavy Industries Co., Ltd.

F23D1/00; (IPC1-7): F23D1/00

JP3110308A
JP3241208A

Tsunemitsu Yamada
Seiichi Otsuka

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