Combined Cycle Power Plant And Method For Operating Such A Combined Cycle Power Plant

A water/steam system for a combined cycle power plant and related method for operating said system are provided. The system comprises a heat recovery steam generator providing a flue gas stream path for extracting heat from a flue gas stream exhausted from a gas turbine, the heat recovery steam generator having a low pressure section including a low pressure evaporator arranged along the flue gas stream path for generating low pressure steam at a low pressure input level for a main input of a low pressure steam turbine. To use heat a low temperatures, embodiments of the system provide that in the low pressure section, additional sub low pressure steam, at a sub low pressure level below the low pressure level, is generated by a sub low pressure evaporator in the flue gas stream path. 本发明涉及种用于联合循环发电厂的水/蒸汽系统(1)，包括提供烟道气流路径(6)来用于从燃气轮机排出的烟道气流(9)获得热的余热回收蒸汽发生器(4)，余热回收蒸汽发生器(4)具有低压区段(3)，其包括沿烟道气流路径(6)布置来用于在用于低压汽轮机(51)的主输入(54)的低压输入水平(p)下生成低压蒸汽的低压蒸发器(13)。此外，本发明涉及种用于操作此水/蒸汽系统(1)的方法。为了在低温下使用热，本发明提供了在低压区段中，低于低压水平(p)的亚低压水平(p)