Steam cooled type gas turbine

摘要

A steam cooled type gas turbine has a steam chamber unit formed in one unit having a compact structure through which steam, as a cooling medium, is appropriately supplied, used for cooling and recovered. The steam chamber unit (1) formed in one unit has a steam supply passage (31) for leading cooling steam, a steam connection passage (32) for leading the cooling steam which has cooled a front stage (5) to a subsequent stage (6) and a steam recovery passage (33) for recovering the cooling steam which has cooled a plurality of the stages. The unit further has a heat insulating structural member (8) for insulation of heat from a moving blade (9) and a stationary blade supporting portion (7), both provided in an inner circumferential surface portion of the steam chamber unit. Supply and recovery of steam to and from stationary blades and cooling by steam of stationary blades can be done with a compact structure having a single consecutive cooling steam passage so that the stationary blades can be cooled efficiently.