초록 ▼

A method and system for controlling water level of a drum of a heat recovery steam generator for a combined cycle power plant is provided. The combined cycle power plant includes gas and steam turbines and the steam generator for recovering heat in exhaust gases from the gas turbine and for using th

A method and system for controlling water level of a drum of a heat recovery steam generator for a combined cycle power plant is provided. The combined cycle power plant includes gas and steam turbines and the steam generator for recovering heat in exhaust gases from the gas turbine and for using the recovered heat to produce and supply steam to the steam turbine. At a start up operation, the water level of the drum is lowered in advance to the plant start up operation so that abrupt rise of the water level due to swelling phenomenon of the boiler water which may result in heat losses by damping water out of the plant is prevented. Also, a gas turbine load increase is maintained at a constant level during a period in which the abrupt water level rise is expected so that the swelling phenomenon is avoided.

대표청구항 ▼

A method of water level control for a combined cycle power plant which includes gas and steam turbines and a steam generator for recovering heat in exhaust gases from the gas turbine and for using the recovered heat to produce and supply steam to the steam turbine, the steam generator including a dr

A method of water level control for a combined cycle power plant which includes gas and steam turbines and a steam generator for recovering heat in exhaust gases from the gas turbine and for using the recovered heat to produce and supply steam to the steam turbine, the steam generator including a drum for containing water, preventing excessive water level increase in the steam generator drum resulting from at least the swelling phenomena by controlling the water level in the steam generator drum during a start-up operation of the powder plant such that the water level in the drum is maintained below a predetermined excessive water level, and wherein the step of controlling the water level in the drum includes lowering the water level in the drum prior to the start-up operation and thereafter increasing the water level in the drum substantially in accordance with the increase of the gas turbine load.