Overfire air tube damper for boiler and method for...

Details Overfire air tube damper for boiler and method for... Overfire air tube damper for boiler and method for...

2007-05-16

2010-02-23

McAllister, Steven B (Department: 3749)

Stoves and furnaces

Dampers

Stove

C126S530000, C126S534000, C126S549000, C126S28500B, C060S295000, C060S297000, C110S147000, C110S160000

Reexamination Certificate

active

07665458

ABSTRACT:
A damper and overfire air duct in a combustion system having a combustion structure defining a flue gas passage, the damper and overfire air duct including: an inlet to the overfire air duct and an outlet to the duct discharging overfire air into the flue gas passage, and the damper aligned with an axis of the overfire air duct, and having an open position axially distal to the inlet and a closed position at least partially in the inlet and duct, wherein the damper is movable axially between the open and closed positions.

REFERENCES:
patent: 823836 (1906-06-01), Wiemann
patent: 1976208 (1934-10-01), Agthe et al.
patent: 4381718 (1983-05-01), Carver et al.
patent: 5199355 (1993-04-01), Larue
patent: 5205226 (1993-04-01), Kitto et al.
patent: 5724897 (1998-03-01), Breen et al.
patent: 5944506 (1999-08-01), Kamal et al.
patent: 7047891 (2006-05-01), Vatsky
patent: 2003/0145768 (2003-08-01), Vatsky
patent: 2004/0244367 (2004-12-01), Swanson et al.

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