COMBINED CYCLE POWER PLANT THERMAL ENERGY CONSERVATION

摘要

A combined cycle power plant includes a gas turbine having a primary flow passage, a heat recovery steam generator having a heat exchanger disposed downstream from the primary flow passage, an exhaust stack in fluid communication with the primary flow passage and disposed downstream from the heat recovery steam generator and a reversible turning gear coupled to a rotor shaft of the gas turbine. The reversible turning gear counter rotates the rotor shaft during turning gear counter rotation operation of the gas turbine and reverses flow of combustion exhaust gas from the exhaust stack through the heat exchanger and back into the primary flow passage of the gas turbine, thereby conserving thermal energy stored in the heat recovery steam generator. A method for conserving thermal energy of a combined cycle power plant during counter rotation turning gear operation of the gas turbine is also disclosed.

主权项

1. A combined cycle power plant, comprising:
a gas turbine having a primary flow passage defined therein and a rotor shaft; a heat recovery steam generator having a heat exchanger disposed downstream from the primary flow passage; an exhaust stack in fluid communication with the primary flow passage and disposed downstream from the heat recovery steam generator; and a reversible turning gear coupled to the rotor shaft of the gas turbine, wherein the reversible turning gear counter rotates the rotor shaft during turning gear counter rotation operation of the gas turbine and reverses flow of combustion exhaust gas from the exhaust stack through the heat exchanger and back into the primary flow passage of the gas turbine.