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US 9,995,481 B2Granted
Method and apparatus for a dual mode burner yielding low NOx emission
AssigneeEclipse, Inc.
InventorsJianhui Hong, Valeriy Smirnov
Life of this patent
Estimating the term…
Abstract
A method and apparatus for a burner adapted to heat a furnace or other environment of use. In particular, a burner for providing a fuel gas in combination with an oxidant to effect controlled reaction of the fuel gas in a manner to reduce NOx emissions is described. Combustion of the fuel gas is shifted from the burner combustor to a location outside the burner once the temperature within the furnace/radiant tube has reached a sufficient level to complete combustion of the fuel gas.
Claims19
A method of operating a burner to reduce NOx emissions comprising:
- providing a burner including a fuel control valve, an oxidant control valve, a combustion chamber, a fuel supply pathway surrounded by an air shroud, a hollow heat recuperator having a convoluted surface, a nozzle disposed in the combustion chamber, wherein the nozzle comprises a sleeve that is secured about a distal end of fuel supply pathway, and an oxidant supply pathway connected to the nozzle and disposed between an outer wall of the air shroud and an interior of the heat recuperator;
- supplying the burner with fuel and oxidant such that the fuel and oxidant flow through the nozzle and intermix in the combustion chamber;
- controlling the fuel control valve and the oxidant control valve in order to provide the flow of fuel and oxidant to the combustion chamber in an amount that maintains a stable flame in the combustion chamber;
- igniting the fuel and oxidant mixture in the combustion chamber;
- heating a space of a furnace that is exterior to the combustion chamber, and into which the combustion chamber does not extend, to a temperature at or above an auto-ignition temperature of a mixture of the fuel and oxidant;
- and
- adjusting at least one of the fuel control valve and the oxidant control valve to increase at least one of the flow of fuel and oxidant into the combustion chamber to destabilize and extinguish the flame in the combustion chamber such that combustion occurs in the space of the furnace that is exterior to the combustion chamber and into which the combustion chamber does not extend in the absence of a flame in the combustion chamber.
4 more elements
A burner for reducing NOx emissions comprising:
- a combustion chamber;
- a fuel supply pathway surrounded by an air shroud;
- a nozzle disposed in the combustion chamber, wherein the nozzle comprises a sleeve that is secured about a distal end of the fuel supply pathway;
- a fuel control valve disposed in the fuel supply pathway;
- a hollow heat recuperator having a convoluted surface;
- an oxidant supply pathway connected to the nozzle and disposed between an outer wall of the air shroud and an interior of the heat recuperator;
- an oxidant control valve disposed in the oxidant supply pathway;
- and
- a controller connected to the fuel control valve and the oxidant control valve, wherein the controller monitors a temperature in a space of a furnace that is external to the combustion chamber, and into which the combustion chamber does not extend, in order to adjust at least one of the fuel control valve and the oxidant control valve to increase at least one of the flow of fuel and oxidant into the combustion chamber to destabilize and extinguish a flame in the combustion chamber when the temperature in the space of the furnace that is exterior to the combustion chamber and into which the combustion chamber does not extend reaches a pre-determined temperature at or above an auto-ignition temperature of a mixture of the fuel and oxidant.
6 more elements
Dependencies are inferred from the claim text.