METHOD OF COMBINED CYCLE POWER PLANT OPERATION WITH CLOSED CIRCUIT OF GAS CIRCULATION Russian patent published in 2008 - IPC F01K23/10 

FIELD: heat power industry.

SUBSTANCE: invention relates to combined cycle power plant (CCPP) with closed gas circulation circuit. Method of CCPP operation with closed gas circulation circuit is that gas is heated in heater and then supplied to gas turbine where part of gas heat is converted into mechanical work. Other part of gas heat is exchanged to liquid contained in heat exchangers having serial connection by liquid and steam is produced at heat exchangers outlet. Cooled in heat exchangers gas is compressed and returned to heater for re-heating and produced from liquid steam is supplied to steam turbines to convert stream energy into mechanical work. Gas is compressed in multi-stage compressor where additional heat exchangers are installed between stages to evaporate liquid by gas heat. Produced steam is heated in first steam heat exchanger installed on the way of gas supply after gas turbine. Liquid is evaporated in the second heat exchanger after gas turbine and is heated to the temperature close to boiling temperature in the third heat exchanger after gas turbine. Liquid is simultaneously evaporated in additional heat exchangers connected in parallel in the direction of liquid movement to heat exchanger for liquid evaporation and interconnected in series in gas movement direction between compressor stages.

EFFECT: invention allows to increase heat efficiency factor of CCPP with closed gas circulation circuits.