STEAM POWER PLANT WITH A FLAME-HEATED STEAM GENERATOR AND A GROUP OF GAS TURBINES

• US 3,789,804 A
• Filed: 12/14/1972
• Issued: 02/05/1974
• Est. Priority Date: 12/14/1972
• Status: Expired due to Term

• Current Assignee: Emile Aguet
• Original Assignee: Emile Aguet
• Inventors: Aguet, Emile
• Primary Examiner(s): Sprague, Kenneth W.
• Application Number:
  US05/314,963
• Time in Patent Office: 418 Days
• Field of Search: 122/1R,7R,7B,479R
• US Class Current: 122/1.00R
• CPC Class Codes: F22B 1/1861 Waste heat boilers with supplementary firing

Abstract

At least two gas turbine groups of identical construction are selectively connected to the burner of the steam generator. If one group fails, the other group takes over to deliver the combustion air necessary to continue efficient operation without an interruption in service. In normal operation, one gas turbine group is connected to the burner while the other is connected at a mixing location in the steam generator, e.g. between the preheater and a superheater.

Claims

1. A steam power plant comprising a flame-heated steam generator including a plurality of heating surfaces for passage of a flow of combustion gas thereover in heat exchange relation with a flow of operative medium therein, a burner for supplying fuel to said generator, at least two gas turbine groUps for supplying combustion air to said steam generator, one of said groups being connected to said burner to deliver combustion air thereto and the other of said groups being connected to said steam generator at a mixing location between two of said heating surfaces disposed downstream of said burner to deliver combustion air thereto, and means for selectively connecting said other groups to said burner to deliver combustion air thereto in response to failure of said one group to deliver combustion air to said burner.

2. A steam power plant as set forth in claim 1 wherein said gas turbine groups are of identical construction.

3. A steam power plant as set forth in claim 1 wherein said means includes a conduit connected in common to said gas turbine groups and to said steam generator at said mixing location, an adjusting valve in said conduit, a minimal-value selector means operatively connected to each said gas turbine group to receive a respective signal therefrom corresponding to the output performance thereof, said selector means being operatively connected to said adjusting valve to control said valve in response to the smaller of said signals whereby said valve is closed in response to the smaller of said signals diminishing towards a value representative of a zero output performance.

4. A steam power plant as set forth in claim 3 which further comprises means for delivering a load signal responsive to the operation of said plant to said selector means for opening said adjusting valve in response to a diminishing load and vice versa.

5. A steam power plant as set forth in claim 1 wherein each gas turbine group includes an outlet pipe for flow of combustion gas therefrom, a control valve in said outlet pipe and means for measuring the performance of said gas turbine group, said measuring means being connected to said control valve to close said control valve in response to a diminishing performance of said gas turbine group and vice versa.

6. A steam power plant as set forth in claim 5 wherein said measuring means is connected to said outlet pipe to measure the flow of combustion gas therein as a measure of said performance of said gas turbine group.

7. A steam power plant as set forth in claim 1 wherein said means includes a conduit connected in common to said gas turbine groups and to said burner and an adjusting valve in said conduit for selectively adjusting the pressure difference between the combustion gases delivered from said groups to correspond to a pressure drop at said heating surfaces between said burner and said mixing location.