Turbine gland steam supply system and operation method thereof

The present invention provides a turbine gland steam supply system by which there is no need to worry about contact due to contraction of gland steam when a turbine is switched from a high load operation to stop or a low load operation, and a method for operating the same. The gland steam supply system supplies gland steam to a gland steam portion of the turbine driven by high-temperature steam from a main steam line and is configured to be capable of supplying mixed steam of the low-temperature steam having temperature lower than the temperature of the high-temperature steam and supplied from a supply source different from the high-temperature steam and the high-temperature steam to the gland steam portion as the gland steam. 本发明提供种在涡轮机从高负荷运转切换到停止或低负荷运转之际不用担心汽封部由于汽封蒸汽收缩而接触的涡轮机汽封蒸汽供给系统及其运用方法。该涡轮机汽封蒸汽供给系统，将汽封蒸汽供给到由从主蒸汽线路供给的高温蒸汽驱动的涡轮机的汽封部，构成为，能够将从与所述高温蒸汽不同的供给源供给的、且温度比所述高温蒸汽的温度低的低温蒸汽与所述高温蒸汽的混合蒸汽作为所述汽封蒸汽供给到所述汽封部。