초록 ▼

A multi-stage topping combustor unit having rich burn, and lean burn zones followed by a quench/dilution zone. Combustible fuel gas is supplied only to the rich burn zone, and an oxygen-containing air-flue gas mixture is supplied to all three zones in a fixed flow proportioning that establishes a de

A multi-stage topping combustor unit having rich burn, and lean burn zones followed by a quench/dilution zone. Combustible fuel gas is supplied only to the rich burn zone, and an oxygen-containing air-flue gas mixture is supplied to all three zones in a fixed flow proportioning that establishes a desired temperature profile through the combustor unit that minimizes combustor NOx and CO emissions. The combustor unit casing is cooled by an augmented air and oxygen stream discharged into the rich burn zone only, or into both the rich and lean burn zones. The cooling air flow is regulated by a control device/valve that allows the cooling air flow, and hence the augmenting oxygen entering the rich burn zone or the rich and lean burn zones, to be reduced as the fuel gas flow/firing temperature is reduced. The concurrent reduction of the cooling air and fuel gas flows enables the combustor unit temperature distribution and NOx and CO emissions to be controlled as gas turbine firing temperature and power output are reduced.

대표청구항 ▼

[ We claim:] [9.] A method for operating a topping combustor unit provided in a gas turbine power plant process, comprising:(a) injecting a fuel gas into an inlet end of a topping combustor unit containing a fuel rich burn zone, a fuel lean burn zone, and a quench/dilution zone arranged in fuel gas

[ We claim:] [9.] A method for operating a topping combustor unit provided in a gas turbine power plant process, comprising:(a) injecting a fuel gas into an inlet end of a topping combustor unit containing a fuel rich burn zone, a fuel lean burn zone, and a quench/dilution zone arranged in fuel gas flow sequence;(b) providing an air-flue gas flow glow to the forward inlet end of each said zone; and(c) providing an augmented oxygen and cooling air flow to the forward inlet end of the fuel-rich zone or to the fuel rich and the fuel lean burn zones at a controlled variable flow rate, so as to control the combustion temperatures in each said zone and minimize production of NOx and CO gases in the combustor unit.