COMPRESSOR, COMBUSTION TURBINE AND COMBUSTION TURBINE COOLING METHOD

摘要

PROBLEM TO BE SOLVED: To make NOx in exhaust gas extremely low by diverging part of discharge air of a compressor at the inner diameter face of a compressor outlet, compressing this air in a compression stage positioned on the lower side of an internal wall of a main compressor outlet diffuser, and installing the main compressor outlet diffuser downstream adjacently to an auxiliary compressor. SOLUTION: A combustion turbine 10 has a plural rows of compressor blades, and a set 20 of a fixed blade and an outlet guide blade is provided directly downstream of the compressor blade 12 in the last row. Air flow passing through this set 20 flows through a main compressor outlet diffuser 30. Main air flow in this diffuser 30 is divided in a main part 32 and auxiliary air flow 34 by an internal wall (partition) 36, and the auxiliary air flow 34 is led to an auxiliary air compressor 50 arranged adjacently to the lower side of the internal wall 36 of the main compressor outlet diffuser 30. The auxiliary air compressor 50 is driven by a center main shaft 11 of the combustion turbine 10 so as to compress the auxiliary air flow 34 and to lead it again into a member to be cooled. Performance of the turbine is thereby improved, and extra-low NOx is emitted.