| 摘要 |
A gas turbine is solidly coupled with rigid couplings in tandem with a reheat steam turbine and utilizes the combined inertia of the rotating members and the braking torque of the gas turbine air compressor to assist a single control system to limit overspeed of the complete unit. In its broadest and preferred form, the normal intercept steam valves and reheat stop valve between the reheater and the lower pressure steam turbine sections are eliminated, and the high pressure steam control valves are used to prevent overspeed, with steam flowing through a "valveless" conduit from the reheater to the lower pressure steam turbine sections. The control system includes means for sensing a potential overspeed condition and operating the control valves to prevent overspeed. In a modified form of the invention a dump valve may be provided between the air compressor discharge and the combustion chamber of the gas turbine. In the modified form the control system will also open the dump valve, or the dump valve may open automatically upon compressor discharge pressure exceeding a preselected value.
|
