SEAL AIR SUPPLY APPARATUS AND EXHAUST GAS TURBINE SUPERCHARGER USING SEAL AIR SUPPLY APPARATUS

Disclosed is a seal air supply apparatus provided with a seal air supply path (77) through which compressed air generated by a seal air compressor (73) provided separately from an exhaust gas turbine supercharger (27) is supplied, as seal air for the exhaust gas turbine supercharger (27), to a seal air supply unit (79); and a surplus air introduction path (81) branched from the seal air supply path (77), through which surplus air of the seal air is introduced toward the outlet of an air supply-side compressor (27a) of a gas turbine supercharger.