1971-02-01

Control Systems for Medium Size Gas Turbines 710549

This paper describes a modular concept for fuel controls used with medium-size, split-shaft gas turbines in the 8000-25000 hp range. The self-imposed restriction does not limit these controls to this power range. Modifications allow the use of the same components for virtually any gas turbine application.
The modular system combines a number of standard components such as fuel valves, limiters, electronic circuits, and station controls together with commercially available items, such as shutoff valves, pressure regulators, etc. Special items to suit a particular specification can easily be added. This type of system offers the control engineer a complete package at an economical price.
The application of electric governors has shown a phenomenal development during the last decade. The discussion, therefore, will concentrate on this type of governor.
The demand for larger blocks of power caused an increase in the application of electric generators driven by two or more aircraft type of gas generators. These installations introduce some unique control problems with respect to load division between gas generators. For such installations using combined cycles (by adding independent head recovery units) the load division between gas generators might have to be unbalanced to suit the demand on the heat recovery units.

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