METHOD OF OPERATING COMBINED-CYCLE PLANT IN MANEUVERING MODE Russian patent published in 2016 - IPC F01K23/06 

FIELD: energy.

SUBSTANCE: combined-cycle plant CCGT comprises at least one gas-turbine plant (GTP), equipped with compressor, turning air guide vanes (TAGV), combustion chamber (CC) and gas turbine (GT), as well as steam turbine plant (STP) equipped with waste-heat steam generators (RSG) by number of GTP connected by system of steam lines with one common steam turbine (ST). Method consists in fact that at least part of steam generated by GTP in gas path from GTP to ST with further removal into atmosphere together with effluent gases. Steam is introduced into air part of gas path of GTE with completely closed or fully open TAGV. In first case steam is introduced only at ambient air temperature of more than 15 °C and taken from steam turbine flow section at pressure minimally exceeding compressed air pressure. With beginning of CCGT relief extraction is stopped, and with beginning of accelerated ST relief at constant fuel consumption in CC steam inlet is continued at least from one steam line from said system of steam lines to ST. At next GTP relief after disconnection of ST in said part of gas path entire high pressure steam is introduced generated in GTP, and fuel consumption is reduced to value at which parameters of introduced steam are maintained at level sufficient for ST pushing start from hot reserve. With more than one GTP steam inlet from steam lines to ST in air part of gas path is performed only for one GTP. In CCGT starting from cold condition steam is introduced into air part of gas path from bypass line of main steam pipeline with completely closed CCGT and steam inlet is stopped with beginning of ST start.

EFFECT: invention relates to combined power CCGT.

4 cl, 1 dwg