US 5,542,840 A · Burner for combusting gas and/or liquid fuel with low NO.sub.x production

Abstract

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.

Claims17

Dependent claims

A burner for combusting fuel and air comprising:

a burner block having an inlet end and an outlet end and a central opening therethrough between the ends, the burner block outlet end being in communication with an enclosure to be heated by burning fuel, and the burner block having a plurality of spaced apart recirculation gas passageways communicating with said burner block inlet, the recirculation gas passageways being at least generally paralleled to and spaced from said central opening and having an injection passageway communicating each recirculation gas passageway with said central opening, recycled gas being drawn from said burner block outlet end and recycled back into said central opening through said recirculation gas passageways and said injection passageways;
a toroidal flame director ring positioned within said central opening in said block;
means for injecting fuel into said burner block central opening;
and
means to move primary combustion air into said burner block central opening at said inlet end, recycled gas being mixed with primary combustion air and fuel in said central opening, the recycled gas serving to cool a flame produced at said burner block outlet end, said toroidal flame director ring serving to cause a Venturi effect to increase the flow of recycled gas.

2 more elements

A burner for combusting fuel and air comprising:

a burner block having an inlet end and an outlet end and a central opening therethrough between the ends, the burner block outlet end being in communication with an enclosure to be heated by burning fuel, the block having a plurality of spaced apart recirculation passageways communicating with the block outlet end, the recirculation passageways being generally paralleled to and spaced from said central opening and the burner block having an injection passageway communicating each recirculation passageway with said central opening;
an annular flame director ring positioned within said central opening and spaced between said injection passageways and said burner block inlet end;
a flame director supported on said flame director ring in alignment and with each said injection passageways;
and
means for injecting fuel into said burner block central opening, recycled gas being drawn through said recirculation gas passageways and injection passageways, said flame directors being oriented to cause recycled gas to whirl within said block central opening.

2 more elements

Dependencies are inferred from the claim text.

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

Life of this patent

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

Life of this patent

Abstract

Claims17