A multistage turbine where steam is extracted (bled) at pressures intermediate between throttle and exhaust, for process or feedwater heating purposes.



Related Terms

DE-AERATING HEATERS

Mechanical device using steam to strip dissolve gases from the boiler feedwater and heating the feedwater.

PARTIAL ARC ADMISSION

In multi-valve turbine inlets, partial arc ad mission allows the steam to enter per valve opening in a sequential manner, so as load is increased, more valves open to admit steam. This can cause uneven heating on the high-pressure annulus as the valves are individually opened with load increase.

EXTRACTION TURBINE

In an extraction turbine, steam is withdrawn from one or more stages, at one or more pressures, for heating, plant process, or feedwater heater needs. They are often called 'bleeder turbines'.

FORGE WELDING

A welding process which produces the joining of metals by heating them in a forge and by applying pressure or blows.

BLEEDING CYCLE

A steam cycle in which steam is drawn from the turbine at one or more stages and used to heat the feedwater. Also known as regenerative cycle.

FIREDAMP REFORMING PROCESS

A process in which methane (firedamp) is mixed with steam and passed over a nickel catalyst for conversion to a mixture of hydrogen and carbon monoxide; this mixture is blended with pure methane, and the result is a fuel of high calorific value.

FEEDWATER

Treated water that is supplied to the boiler to replace the boiler water that has been converted to steam and has been removed from the boiler.

DENTAL COUPLING

A type of flexible coupling used to join a steam turbine to a reduction-gear pinion shaft; consists of a short piece of shaft with gear teeth at each end, and mates with internal gears in a flange at the ends of the two shafts to be joined.

EVAPORATION

The process of converting a liquid into a vapor with accumulation of latent heat.

PASTEURIZATION

A process that involves the controlled heating of the milk to eliminate all pathogenic microorganisms carried in the milk that may transmit diseases to humans.

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