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US 2010/0089066 A1Published application
Cool flame combustion
AssigneeALSTOM Technology Ltd
InventorTheodors Ishaq Mina
Life of this patent
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AssigneeALSTOM Technology Ltd
InventorTheodors Ishaq Mina
Estimating the term…
A combustion process for burning fuel in a combustion chamber is provided. The process includes supplying fuel and air to a burner, the amount of air supplied being at least as much as required for stoichiometric combustion of the fuel and subsequent dilution of the combustion process. The process also includes injecting the fuel and all the air from the burner directly into the combustion chamber in a substantially unmixed state as a fuel stream within an air stream. Fuel is injected from a nozzle, which is nested within an air nozzle. The fuel nozzle ejects a fuel stream of such thickness that the fuel burns in the combustion chamber as a diffusion flame with a high surface-to-volume ratio at or close to the stoichiometric fuel/air ratio. The flow of air through the air nozzle is subject to the venturi effect.
A method for burning fuel with air in a combustion chamber with low production of NOx emissions, comprising the steps of:
A combustor comprising a combustion chamber and at least one burner that in use supplies a fuel stream surrounded by an air stream in a substantially unmixed condition directly into the combustion chamber to burn therein as a diffusion flame with low production of NOx, the at least one burner comprising an air supply nozzle and at least one fuel supply nozzle located within the air supply nozzle, the amount of air supplied by the air supply nozzle being at least as much as required for stoichiometric combustion of the fuel and all subsequent dilution of the combustion process in the combustion chamber, wherein the air is immediately available in a proximity of the flame during the combustion process to act as a heat sink and the combustion process in the flame is followed by fast dilution, with a post-flame reaction continuing as a lean-burn reaction, the at least one fuel supply nozzle being dimensioned to eject the fuel stream with a thickness such that the fuel burns in the combustion chamber at or close to the stoichiometric fuel/air ratio as a diffusion flame with a high surface-to-volume ratio.
Dependencies are inferred from the claim text.