(19)
(11)EP 1 128 039 A3

(12)EUROPEAN PATENT APPLICATION

(88)Date of publication A3:
11.02.2004 Bulletin 2004/07

(43)Date of publication A2:
29.08.2001 Bulletin 2001/35

(21)Application number: 00118535.4

(22)Date of filing:  25.08.2000
(51)Int. Cl.7F02C 7/236, F02C 7/18
(84)Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
Designated Extension States:
AL LT LV MK RO SI

(30)Priority: 25.02.2000 JP 2000054379

(71)Applicant: Hitachi, Ltd.
Chiyoda-ku, Tokyo 101-8010 (JP)

(72)Inventors:
  • Yamanaka, Kazunori
    Hitachi-shi, Ibaraki 317-0027 (JP)
  • Kondou, Satoshi
    Hitachinaka-shi, Ibaraki 312-0023 (JP)
  • Noda, Masami
    Hitachinaki-shi, Ibaraki 312-0053 (JP)

(74)Representative: Strehl Schübel-Hopf & Partner 
Maximilianstrasse 54
80538 München
80538 München (DE)

  


(54)Gas turbine


(57) A gas turbine has a cooling air system supplying air for cooling a high temperature part of the gas turbine and a spray air system supplying air for spraying fuel into a combustor and is formed so that a part of high-pressure air compressed by a gas turbine compressor is used as air of the cooling air system and spray air system, wherein a heat exchanger and a boost compressor are arranged downstream of the outlet of compressed air of the gas turbine compressor, and the boost compressor is composed of a parallel connection of a compressor driven by the turbine shaft and ae compressor driven by a driven source other than the turbine shaft, and pressurized air from the boost compressor is used as air for the cooling air system and the spray air system.