METHOD OF DECREASING HARMFUL EMISSIONS FROM GAS TURBINE WITH HEAT RECOVERY Russian patent published in 2013 - IPC F02C3/30 

FIELD: machine building.

SUBSTANCE: proposed method consists in stepwise compression of oxidiser with water injection, heating of compressed mix of oxidiser with water, stepwise expansion of working medium and combustion of organic fuel in combustion chambers ahead of mid expansion stages with oxidiser surplus factor smaller than unity while, in the final chamber, it is larger than unity. Consumption of oxidizer, water and fuel is controlled and temperature of mix expansion stages walls and their gas-dynamic channels as well as combustion temperature in the final combustion chamber are maintained. Water is injected to compressor inlet and outlet and between its stages in total amount of 20-40% of total consumption of working medium at exhaust stage. Oxidiser surplus factor in combustion chambers ahead of mix expansion stages and gas-dynamic channel is kept at not lower than 0.5 and temperature of mix expansion chambers walls and gas-dynamic channel may not be lower than 730 K. Catalytic combustion proceeds in outlet chamber at 1500-1100 K that is at temperature lower than that in downstream combustion chambers while oxidiser surplus factor equals or exceeds stoichiometric factor.

EFFECT: decreased harmful emissions of gas turbine, high efficiency of heat recovery and rules out sooting.

1 dwg