초록 ▼

A gas turbine combustor comprises a combustion chamber, a premixing chamber in which hydrocarbon fuel and air are premixed, a nozzle with swirler for swirling and injecting the premixed fuel and air into the combustion chamber, to effect premixed combustion, and a fuel nozzle projecting into the com

A gas turbine combustor comprises a combustion chamber, a premixing chamber in which hydrocarbon fuel and air are premixed, a nozzle with swirler for swirling and injecting the premixed fuel and air into the combustion chamber, to effect premixed combustion, and a fuel nozzle projecting into the combustion chamber and adapted to inject fuel at region wherein the premixed combustion is completed, so as to effect low air-ratio diffusion combustion thereby to produce reducing substance. NOx produced by the premixed combustion is reduced by reducing reaction with the reducing substances, so that the NOx concentration in the combustion gas is reduced. The combustor further includes an after-air ports on a peripheral wall defining the combustion chamber to effect combustion of unburnt substances.

대표청구항 ▼

A method of combustion comprising the steps of: premixing fuel and air in a premixing chamber to provide premixed fuel and air at a ratio of actual air supplied to the theoretical air required for stoichiometric combustion greater than 1; injecting the premixed fuel and air mixture into the combust

A method of combustion comprising the steps of: premixing fuel and air in a premixing chamber to provide premixed fuel and air at a ratio of actual air supplied to the theoretical air required for stoichiometric combustion greater than 1; injecting the premixed fuel and air mixture into the combustion chamber while causing the premixed fuel and air to swirl and igniting it to effect premixed combustion during operation of the combustor to thereby produce combustion gas including NOx; injecting fuel into said combustion chamber at a downstream side of a region wherein the premixed combustion is completed, to effect diffusion combustion so as to produce reducing substances; reacting NOx contained in the combustion gas with the reducing substances to lower the concentration of NOx in the combustion gas; and introducing combustion air into said combustion chamber at a downstream side of a region wherein the diffusion combustion is effected to thereby effect combustion of unburnt combustible substances, and wherein said region wherein the premixed combustion gas is completed is detected by measuring fuel concentration in a combustion flame, said region being a region where the measured fuel concentration is zero.