Combustion burner resulting in low oxides of nitrogen
AssigneeConvergence Combustron Inc.
InventorAndrew P. Jones
Life of this patent
Estimating the term…
Abstract
A combustion burner resulting in low oxides of nitrogen includes a primary combustion zone, for use as an ignition source. The primary combustion zone locating within a combustion chamber, and being separated from the base of the combustion chamber by a wall. A burner provides a secondary oxidant stream that is delivered to the combustion chamber at the base of an exterior wall, to entrain and mix with flue gases present in the combustion chamber. Then secondary fuel is injected into the resulting secondary oxidant-flue gas mixture. Combustion of the secondary fuel with the oxidant flue gas mixture results in lower concentration of oxides of nitrogen emitted to the atmosphere.
Claims19
A method of discharging a substantially stoichiometric amount of fuel and oxidant into a combustion chamber forming flue gases, said flue gases being burned, and the resulting emissions having low oxides of nitrogen, said combustion chamber including a base, comprising the steps:
- (a) delivering a primary fuel stream and primary oxidant stream to a primary combustion zone locating inside of said combustion chamber;
- (b) combusting said primary fuel stream and said oxidant stream in said primary combustion zone adjacent to an exterior wall extending from said base into said combustion chamber adjacent to said primary combustion zone;
- (c) discharging a secondary oxidant stream from a secondary oxidant plenum adjacent to said exterior wall into said combustion chamber near said base, said secondary oxidant stream entraining and mixing with said flue gases in said combustion chamber forming a secondary oxidant-flue gas mixture flowing towards a primary burner zone;
- (d) injecting a secondary fuel stream from at least one secondary fuel injector at a discharge location, said injector locating between said discharge location and said primary burner zone;
- (e) mixing said secondary fuel stream with said secondary oxidant-flue gas mixture forming a secondary oxidant-flue gas-fuel mixture flowing towards said primary burner zone of at least a velocity preventing ignition of said secondary oxidant-flue gas-fuel mixture while entraining and mixing with additional flue gases in said combustion chamber;
- and
- (f) igniting said secondary oxidant-flue gas-fuel mixture adjacent to the primary combustion zone where said primary fuel stream and said primary oxidant stream merge with said secondary oxidant-flue gas-fuel mixture and flow past said primary combustion zone into said combustion chamber.
An assembly emitting low oxides of nitrogen following combustion comprising:
- a combustion chamber having a base, an exterior wall upon said base, a primary fuel stream, a primary oxidant stream, a secondary oxidant plenum, a secondary oxidant stream, a secondary fuel stream, and at least one secondary fuel injector;
- said combustion chamber having a primary combustion zone receiving a substantially stoichiometric amount of fuel and oxidant from said primary fuel stream and said primary oxidant stream, and a primary burner zone;
- said exterior wall extending from said base into said combustion chamber adjacent to said primary combustion zone;
- said primary fuel stream and said oxidant stream being combusted in said primary combustion zone adjacent to said exterior wall and forming flue gases;
- said secondary oxidant plenum locating adjacent to said exterior wall, said secondary oxidant plenum discharging said secondary oxidant stream into said combustion chamber near said base, said secondary oxidant stream entraining and mixing with said flue gases in said combustion chamber thus forming a secondary oxidant-flue gas mixture flowing towards said primary burner zone;
- said at least one secondary fuel injector injecting a secondary fuel stream at a discharge location, said injector locating between said discharge location and said primary burner zone;
- said secondary fuel stream mixing with said secondary oxidant-flue gas mixture forming a secondary oxidant-flue gas-fuel mixture flowing towards said primary burner zone of at least a velocity preventing ignition of said secondary oxidant-flue gas-fuel mixture while entraining and mixing with additional flue gases in said combustion chamber;
- and,
- said secondary oxidant-flue gas-fuel mixture being combusted adjacent to said primary combustion zone, said primary fuel stream and said primary oxidant stream merging with said secondary oxidant-flue gas-fuel mixture and flowing past said primary combustion zone into said combustion chamber.
Dependencies are inferred from the claim text.