PURPOSE: To respectively improve the efficiency and reliability of a power generation plant to cool a gas turbine with nitrogen of an air separation device by providing a mixer between the air separation device and the gas turbine and by providing a cooler between a compressor of the gas turbine and mixed air.
CONSTITUTION: A coal gasification complex power generation plant is furnished with a coal gasification furnace 5, an air separation device 10 to supply oxygen as an oxidant to the coal gasification furnace 5, and a gas turbine 3. At this time, the gas turbine 3 constitutes a gas turbine device with an air compressor 1, a combustor 2 and a gas turbine generator 4. Then, nitrogen produced by the air separation device 10 is used as a coolant at a high temperature part of the gas turbine 3. In this case, a mixer 115 is installed in a pipe line arranged between the air separation device 10 and the gas turbine 3. Thereafter, a cooling air pipe line 111 is arranged between the compressor 1 of the gas turbine 3 and the mixer 115, and a cooler 99 is installed in this cooling air pipe line 111.
TOMURO JINICHI
TAMURA ZENSUKE
NOGUCHI YOSHIKI
SASAKI TOSHIHIKO
