Chapter 6

Steam Turbines

The steam turbine handles the maximum power demand among all stationary prime movers that are used for electric power generation. A steam turbine is a constant volume machine. The relation between nozzle-box pressure and stage pressures vs. load is linear in nature. There are two basic types of steam turbines. The impulse stage is best suited for high-pressure region and for small steam quantities. The reaction stage is advantageous at the lower pressure region, where a large volume of steam must be handled. There are three basic methods of steam admission to the turbine: throttle governing, nozzle governing, and bypass governing. Lubrication of the steam turbine is required to minimize the rotating friction in the ...

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