Apparatus for introducing gas recirculation into a furnace

摘要

Apparatus for cooperation with an associated furnace having the capability of burning either coal or oil wherein the improvement includes a coutant having an opening in the bottom thereof. An extended ash hopper is disposed under the coutant. The hopper includes a portion that extends beyond the coutant and a furnace sidewall that abuts an end of the coutant. The ash hopper is generally registered with respect to the opening and the apparatus includes apparatus for conducting gases to be recirculated including a recirculation fan, a duct coupling the apparatus for conducting to the ash hopper; and apparatus for sealing the portion with respect to the duct. In some forms of the invention the duct enters the laterally extending portion through the top thereof. The apparatus for sealing may include first apparatus for receiving a liquid and apparatus for sealing includes at least a first plate fixed to and depending form the coutant. The first apparatus for receiving may include a trough disposed in generally registered relationship to the first plate. The apparatus for sealing may include a second plate disposed in depending relationship from the coutant and fixed to the coutant. The duct may have a generally inverted U-shape. In some forms of the invention the hopper further includes a second portion extending beyond the coutant and a second furnace sidewall.