START-UP CONTROL DEVICE AND START-UP CONTROL METHOD FOR COMBINED CYCLE POWER GENERATION PLANT

To provide a start-up control device and a start-up control method for a combined cycle power generation plant capable of shortening the plant start-up time compared with conventional ones.SOLUTION: The start-up control device includes: a converter for inputting a high-pressure steam outlet pressure signal of an exhaust heat recovery boiler and outputting a saturation temperature signal; a rise rate setting circuit that outputs a saturation temperature rise set value to start the exhaust heat recovery boiler at a certain temperature rise rate in response to the saturation temperature signal; a converter that converts the saturation temperature rise set value and outputs a steam pressure set value; and a valve opening degree setting device that outputs an opening degree signal for a high-pressure turbine bypass valve from the steam pressure set value and the high-pressure steam outlet pressure signal. The valve opening degree setting device controls an opening degree of the high-pressure turbine bypass valve, and steam is recovered to a condenser until steam conditions are met for inflow to the steam turbine, and then switched to inflow into the steam turbine after the steam conditions are met.SELECTED DRAWING: Figure 1 【課題】従来に比べてプラント起動時間を短縮することのできるコンバインドサイクル発電プラントの起動制御装置及び起動制御方法を提供する。【解決手段】排熱回収ボイラの高圧蒸気出口圧力信号を入力し、飽和温度信号を出力する変換器と、飽和温度信号に対し、一定の温度上昇率で排熱回収ボイラを起動させる為の飽和温度上昇設定値を出力する上昇率設定回路と、飽和温度上昇設定値を変換して蒸気圧力設定値を出力する変換器と、蒸気圧力設定値と、高圧蒸気出口圧力信号とから、高圧タービンバイパス弁の開度信号を出力する弁開度設定器とを具備し、弁開度設定器によって高圧タービンバイパス弁の開度を制御し、蒸気タービンに流入する蒸気条件が成立するまでの間蒸気を復水器へ回収し、蒸気条件が成立した後蒸気タービンへの流入に切り替える。【選択図】図１