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AssigneeHague International
InventorsPaul G. LaHaye, John W. Bjerklie, Gerald G. Gallant, Jr.
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An energy conserving process furnace has a recuperator to utilize heat derived from exhaust gases in order to reduce fossil fuel consumption of the furnace. Elongated, enhanced surface ceramic heat exchanger tubes are used in the recuperator to recover heat energy from the exhaust gas. A preferred sealing arrangement is used between the metal and ceramic tubes to contain the combustion air. Heat is added by the recuperator to combustion air used in a fluid fuel burner. A recirculating burner has a flame front outside of the burner in the combustion chamber. The recirculating burner means acts to reduce the combustion air requirements and to provide a combustion zone low in oxygen so as to prevent scale formation and oxidation of metals being treated in the furnace area.
A recirculating burner for use in a furnace area comprising,
In a burner having an outwardly facing eductor channel with a combustion air nozzle mounted therein to provide combustion air about a fuel nozzle tip with provision for entrance of supplemental hot gases to mix with said combustion air and first and second means for respectively providing combustion air to said air nozzle and fuel to said fuel nozzle tip,
Dependencies are inferred from the claim text.