Zeeco, Inc.

Richard C Allen

Alan D Witwer

David J Surbey

James L Smith

A burner for combusting gas and/or liquid fuel and air in an enclosure includes a burner block of non-combustible material, such as ceramic material, having a central opening therethrough communicating with a combustion zone. The burner block has a plurality of spaced apart recirculation gas passageways paralleled to and spaced from the central opening, each of the recirculation gas passageways having an injection passageway communicating with the block member central opening. Fuel, which may be liquid and/or gas, is injected into said burner block central opening. Venturi action causes furnace gas to be drawn from the cool fringes of the combustion zone through the recirculation gas passageways for passage back into the central opening wherein air and fuel are thoroughly mixed and cooled for combustion within the enclosure. This recirculation system serves to reduce the temperature and oxygen content of the local combustion process to thereby reduce NO.sub.x production. An annular flame director ring positioned within the burner block central opening adjacent to and below the injection passageways augments the Venturi action to increase flow through the recirculation passageways.

Burner for combusting gas and/or liquid fuel with low NO.sub.x production

A burner for combusting fuel gas and air in an enclosure includes a block member of non-combustible material, such as ceramic material, having a central opening therethrough. The block member has a plurality of spaced apart recirculation gas passageways paralleled to and spaced from the central opening, each of the recirculation gas passageways having an injection passageway communicating with the block member central opening. A fuel gas jet is positioned within each of the recirculation gas passageways for injecting fuel gas into the injection passageways to cause the injected fuel gas by Venturi action, to draw furnace gas from the cool fringes of the combustion zone through the recirculation gas passageways for passage back into the central opening after local combustion wherein modified air and fuel gas are thoroughly mixed and cooled for combustion within the enclosure. This recirculation system serves to reduce the temperature and oxygen content of the local combustion process to thereby reduce NO.sub.x production.

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Catoosa, OK, United States of America

Richard C Allen