STACK ENERGY CONTROL IN COMBINED CYCLE POWER PLANT

A combined cycle power plant and method for operating a combined power plant with stack energy control are presented. The combined cycle power plant includes a gas turbine, a heat recovery steam generator including a plurality of heating surfaces, and a steam turbine. The heating surfaces may be partially bypassed to reduce steam production in the heat recovery steam generator during power plant startup. Less energy may be extracted from exhaust gas of the gas turbine. More energy may be dumped through an exhaust stack. The steam turbine may start without restriction of a gas turbine load during power plant startup. The steam turbine may start without increasing a size of an air cooled condenser while maintaining a higher load of a gas turbine during power plant startup. 提供了种联合循环动力装置和用于操作具有烟囱能量控制的联合动力装置的方法。联合循环动力装置包括燃气轮机、具有多个加热表面的热回收蒸汽发生器以及蒸汽轮机。加热表面可以在动力装置启动期间被部分绕过以在热回收蒸汽发生器中减少蒸汽产生。可以从燃气轮机的排气提取较少能量。较多能量可以通过排气烟囱排出。蒸汽轮机可以在动力装置启动期间不限制燃气轮机负载的情况下起动。蒸汽轮机可以在无需增大气冷式冷凝器的尺寸且同时在动力装置启动期间保持燃气轮机的较高负载的情况下起动。