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



Related Terms

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In an extraction turbine, steam is withdrawn from one or more stages, at one or more pressures, for heating, plant process, or feedwater heater needs.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

DE-AERATING HEATERS

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

BAYONET-TUBE EXCHANGER

A dualtube apparatus with heating (or cooling) fluid flowing into the inner tube and out of the annular space between the inner and outer tubes; can be inserted into tanks or other process vessels to heat or cool the liquid contents.

STEAM RATE

The steam rate is the pounds of steam that must be supplied per kilowatt-hour of generator output at the steam turbine inlet.

TITRATION

A chemical process used in analyzing feedwater.

COMBINED CYCLE

Where heat from the exhaust gases of a gas turbine is used to generate steam to drive a steam turbine.

CLOSED FEEDWATER HEATER

An indirect -contact feedwater heater; that is, one in which the steam and water are separated by tubes or coils.

NORMALIZING

Process of heating metal above critical the range, followed by air-cooling.

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.

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