Pulverized coal combustion burner

F - Mech Eng,Light,Heat,Weapons – 23 – D

Patent

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Details

F23D 1/00 (2006.01) F23C 6/04 (2006.01) F23D 1/02 (2006.01) F23D 17/00 (2006.01)

Patent

CA 2162244

Object: To provide a pulverized coal combustion burner in which a circumferential distribution of pulverized coal density at an outlet portion of a pulverized coal nozzle is made uniform and a complete NOX decrease is attained. Construction: An oil gun (01) for stabilizing combustion is provided at the center portion, and an annular sectional oil primary air flow path (02) surrounding the oil gun (01) and an annular sectional pulverized coal and primary air mixture flow path (14) surrounding the oil primary air flow path (02) are provided. Around the mixture flow path (14), an annular sectional secondary air flow path (15) and an annular sectional tertiary air flow path (16) surrounding the secondary air flow path (15) are provided. A pulverized coal supply pipe is connected in the tangential direction to the mixture flow path (14). Further, an entering angle control means (28) of said mixture is provided within the pulverized coal supply pipe (11). Within the mixture flow path (14), a pulverized coal density dividing cylinder (25) is provided.

La présente invention a pour objet un brûleur à charbon pulvérisé dans lequel la densité du charbon pulvérisé est uniformément distribuée à la circonférence de l'extrémité de sortie d'un injecteur de brûleur à charbon pulvérisé, les émissions de Nox étant ainsi complètement éliminées. Construction : un gicleur d'huile (01) est utilisé au centre de l'injecteur pour stabiliser la combustion du charbon; un flux d'air primaire à circulation annulaire (02) enveloppe le gicleur d'huile (01) et un flux de mélange de charbon pulvérisé et d'air primaire à circulation annulaire (14) entoure le flux d'air primaire à circulation annulaire (02). Autour du flux de mélange à circulation annulaire (14), un flux d'air secondaire à circulation annulaire (15) et un flux d'air tertiaire à circulation annulaire (16) entourant le flux d'air secondaire à circulation annulaire (15) est assuré. Un tuyau d'alimentation en charbon pulvérisé est raccordé dans une direction tangentielle à l'écoulement du mélange (14). En outre, un dispositif de réglage de l'angle d'admission (28) du mélange en question est incorporé à l'intérieur du tuyau d'alimentation (11). L'installation en question comporte un cylindre de séparation densimétrique du charbon pulvérisé (25).

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