GAS TURBINE BURNER AND OPERATING METHOD OF GAS TURBINE BURNER Russian patent published in 2010 - IPC F23R3/34 F23R3/24 

FIELD: power industry.

SUBSTANCE: gas turbine burner (4) with combustion zone (6) for firing the mixture from exit gas (10) with addition of gaseous fuel (8) and with fuel mixing device (18) with fuel nozzle (20, 34, 48) for spraying of gaseous fuel (8) to the exit gas (10); at that, fuel mixing device (18) is designed for injection of gaseous fuel (8) to exit gas (10) at least with 0.2-fold sound speed. Injected jet (22) from gaseous fuel (8) includes at least internal jet (30) from fuel containing gas and enveloping internal jet (30), external jet (32) from cooling gas; at that, cooling gas has the temperature which is lower than exit gas (10). Primary combustion gas is provided (12); at that, combustion zone (6) is located in exit gas flow below primary combustion chamber (12), and fuel mixing device (18) is provided for injection of gaseous fuel (8) to exit gas (10) from primary combustion chamber (12). Fuel mixing device (18) includes pre-mixing unit (24) for pre-mixing of gaseous fuel (8) with oxygen-containing gas or inert substance. Cut gradient in edge area (26) of injected jet (22) in the area before outlet of nozzle (28) lies above critical cut gradient for self-ignition of gaseous fuel (8). Fuel mixing device (18) is designed for spraying to exit gas (10) of gaseous fuel (8) with pressure which is at least by 20% higher, preferably at least by 50% higher than intermediate pressure in the secondary combustion area (6). Cooling gas temperature is 200°C to 600°C. Velocity of external jet (32) from cooling gas is equal to velocity of internal jet (30). Velocity of external jet (32) from cooling gas is higher than velocity of internal jet (30). Cooling gas contains fuel. Cooling gas consists at least of inert substance and/or air. Exit gas temperature (8) in combustion area (6) is 900°C to 1600°C.

EFFECT: invention allows reducing the output of hazardous substances to atmosphere.

18 cl, 3 dwg