METHOD FOR REDUCING EMISSIONS OF NITROGEN OXIDES FROM GAS-TURBINE PLANT WITH HEAT RECOVERY Russian patent published in 2013 - IPC F02C3/30 

FIELD: engines and pumps.

SUBSTANCE: method for reducing emissions of nitrogen oxides from a gas-turbine plant with heat recovery consists in stepped combustion of an oxidiser with water injection, heating of compressed mixture of oxidiser with water, stepped expansion of working medium and combustion of organic fuel in combustion chambers before intermediate expansion stages with excess oxidiser coefficient of less than one, and in the last chamber higher than one. Consumptions of oxidiser, water and fuel are controlled and allowable temperature values of walls of intermediate expansion stages and their gas-dynamic paths, as well as combustion temperature in the last combustion chamber is maintained. To compressor inlet and outlet and between its stages there injected is water with total consumption of 20-40% of total consumption of working medium at the outlet. In combustion chambers before intermediate expansion stages and in a gas-dynamic path there maintained is excess oxidiser coefficient of not less than 0.5 and temperature of walls of intermediate expansion stages and gas-dynamic path of not less than 730 K. In the outlet chamber there performed is a combustion process ensuring the temperature of 1500-1100 K, below temperature in the preceding combustion chambers, and oxidiser coefficient close to stoichiometric coefficient equal to 1.01 to 1.3.

EFFECT: reduction of formation of nitrogen oxides at providing high efficiency of heat conversion and avoiding soot formation in a gas-turbine plant.