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Function of feed pump in a boiler feed system / steam turbines

The feed pump raises the feedwater
The feed pump raises the feedwater to a pressure high enough for it to enter the boiler. For auxiliary boilers, where small amounts of feedwater are pumped, a steam-driven reciprocating positive displacement pump may be used.



Another type of feed pump often used on package boiler installations is known as an 'electro feeder'. This is a multi-stage centrifugal pump driven by a constant speed electric motor. The number of stages is determined by the feed quantity and discharge pressure.

Steam turbine-driven feed pumps are usual with high-pressure watertube boiler installations. A typical turbo-feed pump is shown in Figure above. The two-stage horizontal centrifugal pump is driven by an impulse turbine, the complete assembly being fitted into a common casing.

The turbine is supplied with steam directly from the boiler and exhausts into a back-pressure line which can be used for feed heating. The pump bearings are lubricated by filtered water which is tapped off from the first-stage impeller. The feed discharge pressure is maintained by a governor, and overspeed protection trips are also provided.

Boiler feed pump

Fig:Boiler feed pump


Related Info:

Closed feed system for an auxiliary boiler - operating principle

Open feed system for an auxiliary boiler - how it works

Auxiliary Feed systems for boilers and steam turbines

Function of condenser in a feed system for boiler and steam turbine

How De-aerator works in a boiler feed system

Heat exchangers in a boiler feed system / steam turbines

Boiler feed operation and maintenance

General arrangement for marine boiler

Water tube boilers

Fire tube boilers

The use of boiler mountings

Combustion process - supply of air

Purity of boiler feedwater

Boiler feed pump operational safety

Boiler feedwater treatment

The steam to steam generator

Combustion process - supply of fuel oil

Safety valves

Boiler water level control -operational safety

Water level gauges

Boiler operation -additional safety

Double evaporation boilers

Exhaust gas heat exchangers

Fuel oil burning process - various design burners

Ordinary spring-loaded Boiler safety valve

Requirement for various boiler types on board cargo ships

Safety precautions for working with marine boiler

Exhaust gas heat exchangers

Boiler arrangement - combustion process - supply of air

How to control combustion in a marine boiler

Pressure jet burner,Rotating cup burner,Steam blast jet burner & Air register for side fired boiler



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