An improved pulverized coal burner

Details An improved pulverized coal burner An improved pulverized coal burner

F - Mech Eng,Light,Heat,Weapons

23

C

F23C 1/10 (2006.01) F23C 1/12 (2006.01) F23C 7/00 (2006.01) F23D 1/00 (2006.01) F23D 17/00 (2006.01) F23K 3/02 (2006.01) F23M 9/00 (2006.01)

Patent

CA 2271663

A burner (40) having a transition zone (46) to act as a buffer between the primary zone (42) and the secondary zones (48, 50). The transition zone (46) allows improved control of near-burner mixing and flame stability by providing limited recirculation regions between the primary zone (42) and the secondary zones (48, 50). These limited recirculation regions transport evolved NO x back towards an oxygen-lean pyrolysis zone near the burner exit (52) for reduction to molecular nitrogen, thus decreasing emissions and unburned fuel losses.

Brûleur qui permet une réduction des rejets et des pertes d'imbrûlés grâce à la présence d'une zone de transition destinée à agir comme un tampon entre les flux d'air primaire et secondaire. Ladite zone apporte une meilleure régulation du mélange à proximité du brûleur et de la stabilité de la flamme grâce à la présence de deux régions de recirculation limitées entre les flux primaire et secondaire. Ces régions renvoient le NOx rejeté vers une zone de pyrolyse pauvre en oxygène en vue de la réduction du NOx en azote moléculaire.

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