Furnace having burners supplied with heated air
AssigneeAlco Standard Corporation
InventorJames S. Bolt
Life of this patent
Estimating the term…
Abstract
The hot flue gas expelled from a furnace is used to heat air which is supplied to the burners that fire the furnace. The heated air is delivered to each burner through its ceramic burner block rather than through its cast iron burner body so as to avoid the need of making the body out of expensive alloys capable of withstanding high temperatures.
Claims6
A furnace comprising a walled enclosure defining a heating chamber, a burner supported by said enclosure for heating said chamber, said burner comprising a tubular metallic body adapted to receive fuel and combustion air for producing a hot gaseous stream, a tubular burner block made of non-metallic refractory material and secured to one end of said body for receiving said stream, said burner block having a constricted nozzle for increasing the velocity of said stream and having a tubular extension located downstream of said nozzle, said extension having an interior larger than the downstream end of said nozzle, means defining an annular compartment around said extension, a series of passages formed through and spaced angularly around said extension and establishing communication between said compartment and the interior of said extension, means defining an air chamber located to be heated by heat produced in said heating chamber, and means for establishing communication between said air chamber and said compartment whereby heated air in said air chamber flows into said compartment and through said passages to mix with the hot gaseous stream passing within said extension.
A furnace comprising a walled enclosure defining a heating chamber, a burner supported by said enclosure for heating said chamber, said burner comprising a tubular body adapted to receive fuel and combustion air for producing a hot gaseous stream, a tubular burner block secured to one end of said body for receiving said stream, said burner block being made of non-metallic refractory material, means defining an annular compartment around said burner block, series of passages formed through and spaced angularly around said burner block and establishing communication between said compartment and the interior of said burner block, means defining an air chamber located to be heated by heat produced in said heating chamber, and means for establishing communication between said air chamber and said compartment whereby heated air in said air chamber flows into said compartment and through said passages to mix with the hot gaseous stream passing within said burner block.
Dependencies are inferred from the claim text.