Over-fire air control system for a pulverized solid fuel...

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

Patent

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Details

F23L 9/02 (2006.01) F23C 6/04 (2006.01) F23C 7/00 (2006.01) F23C 7/02 (2006.01) F23D 1/00 (2006.01) F23N 3/06 (2006.01)

Patent

CA 2238772

An over-fire air control system for a pulverized fuel furnace, in which a burner assembly is provided for discharging a fuel/primary air mixture along with secondary air to combust the fuel. The amount of primary air and secondary air discharge is controlled to achieve incomplete combustion, and an overfire air port is provided through which additional air is discharged to complete the combustion. The overfire air port receives two streams of air, one high in volume and low in velocity and the other low in volume and high in velocity. Dampers are provided for controlling the air streams to achieve optimum quantities and velocities of the air. According to one embodiment, a source of one of the air streams is the primary air portion of the fuel/primary air mixture applied to the burner assembly. As a result, the formation of nitrous oxides are reduced and fairly precise air fuel ratios can be maintained despite variations in the quality of the fuel and the pressure and amount of primary air.

Cette invention concerne un système de régulation de l'alimentation en air de combustion tertiaire d'une chaudière à combustible pulvérisé équipée d'un brûleur alimenté d'un mélange combustible-air primaire ainsi que d'air de combustion secondaire. La quantité d'air primaire et secondaire est réglée de manière à réaliser une combustion incomplète, et un orifice d'alimentation en air tertiaire sert à injecter de l'air additionnel contribuant à la combustion complète du combustible. Cet orifice reçoit deux flux d'air, un premier flux à grand volume et faible vitesse et un second à faible volume et grande vitesse. Des registres de régulation servent à optimiser les quantités et vitesses d'air de combustion. Selon une variante, un de ces flux d'air est prélevé du mélange combustible-air primaire dirigé vers le brûleur. Cette solution permet de réduire la production d'oxydes d'azote et de maintenir les rapports combustible-air à l'intérieur d'une fourchette passablement étroite en dépit des variations de la qualité du combustible et de la pression et de la quantité de l'air primaire.

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