Combined plant having steam turbine and gas turbine connected by single shaft
AssigneeHitachi, Ltd.
InventorsAkira Okabe, Haruo Urushidani, Katsuto Kashiwahara
Life of this patent
Estimating the term…
Abstract
A combined plant including a gas turbine, a steam turbine and a waste heat recovery boiler using exhaust gases of the gas turbine as a heat source for producing steam serving as a drive source of the steam turbine further includes an ancillary steam source separate from and independent of the waste heat recovery boiler. At the time of startup of the plant, steam from the ancillary steam source is introduced into the steam turbine until the conditions for feeding air to the waste heat recovery boiler are set, to thereby avoid overheating of the steam turbine due to a windage loss.
Claims6
A combined plant comprising a gas turbine, steam turbine and a waste heat recovery boiler using exhaust gases of said gas turbine as a heat source for producing steam serving as a drive source of said steam turbine, said gas turbine and said steam turbine being connected together by a single shaft, wherein the improvement comprises:
- an ancillary steam source;
- ancillary steam line means connected to steam line means for introducing the steam generated by said waste heat recovery boiler to said steam turbine;
- an ancillary steam control valve mounted in said ancillary steam line means whereby ancillary steam can be introduced through said ancillary steam line means into said steam turbine when said plant is started, to thereby avoid overheating of the steam turbine;
- and bypass line means for routing steam from the waste heat recovery boiler to a condenser by bypassing the steam turbine until the steam generated in the waste heat recovery boiler reaches a satisfactory condition at plant startup.
Dependencies are inferred from the claim text.