METHOD AND APPARATUS FOR A DUAL MODE BURNER YIELDING LOW NOx EMISSION
First Claim
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1. A method of operating a burner comprising:
- providing a burner including a combustion chamber, a combustor outlet, a movable fuel tube, and a fuel tube movement device coupled to the movable fuel tube;
supplying the burner with fuel and oxidant, the fuel being supplied such that the fuel enters the movable fuel tube;
igniting the fuel and oxidant mixture in the combustion chamber;
heating a space exterior to the combustion chamber to a temperature at or above an auto-ignition temperature of a mixture of the fuel and oxidant; and
activating the fuel tube movement device to move the movable fuel tube in a direction toward the combustor outlet to extinguish the flame in the combustion chamber such that combustion occurs in the space exterior to the combustion chamber in the absence of a flame in the combustion chamber.
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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.
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Citations
20 Claims
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1. A method of operating a burner comprising:
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providing a burner including a combustion chamber, a combustor outlet, a movable fuel tube, and a fuel tube movement device coupled to the movable fuel tube; supplying the burner with fuel and oxidant, the fuel being supplied such that the fuel enters the movable fuel tube; igniting the fuel and oxidant mixture in the combustion chamber; heating a space exterior to the combustion chamber to a temperature at or above an auto-ignition temperature of a mixture of the fuel and oxidant; and activating the fuel tube movement device to move the movable fuel tube in a direction toward the combustor outlet to extinguish the flame in the combustion chamber such that combustion occurs in the space exterior to the combustion chamber in the absence of a flame in the combustion chamber. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A burner comprising:
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a combustion chamber terminating at a combustor outlet; a movable fuel tube, the movable fuel tube including a first end disposed near the combustion chamber; and a fuel tube movement device coupled to the movable fuel tube for moving the fuel tube toward and away from the combustor outlet. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification