What is the function of feed water pump of boiler?

What is the function of feed water pump of boiler?

function of feed pump in a boiler is to feed water to boiler. Two type of feed pumps are generally used in boilers-positive displacement type and centrifugal type.in some pumps special device or accessory is used to keep the water at saturation pressure and release over pressure.

What is the composition of boiler feed water?

Boiler feedwater, consisting of fresh water plus returned condensate, is heated in the deaerator to full saturation temperature corresponding to the steam pressure. The purpose is to scrub out and carry away dissolved gases, especially oxygen.

What are the requirement for boiler feed water?

The composition of boiler feed water must be such that the impurities in it can be concentrated a reasonable number of times inside the boiler, without exceeding the tolerance limits of the particular boiler design. If the feed water does not meet these requirements it must be pretreated to remove impurities.

What is boiler feed pump turbine?

In general, the boiler feed pump turbine uses both steam from the boiler and the main turbine to drive the mechanical shaft connected to the boiler feed pump. This arrangement has proven highly successful in efficiently applying the steam’s thermal energy throughout the plant.

What is the cause for black smoke in the boiler uptake?

Improper burning is the cause of black smoke coming from a boiler. If the oil does not burn normally, it will produce a dark-colored smoke that may be seen from the rooftop vent or wafting directly out of the boiler. It can also be caused by oil building up in the combustion chamber due to delayed ignition.

How do you remove oxygen from boiler feed water?

Heating the feed water and maintaining it at a high temperature prior to its delivery to boiler, in the feed tank can drive off both oxygen & free carbon dioxide. Any remaining oxygen can then be dealt with by the addition of a chemical oxygen scavenger such as catalyzed sodium sulphite.

What is the working principle of a boiler feed pump?

Working Principle of a Boiler Feed Pump The work of a boiler feed pump is to discharge the condensate boiler feed water from hotwell to the boiler drum. With the rotation of shaft and impeller the hot feed water is thrown outwards radially across the walls of the pump; along the path of the flow.

What is a boiler impeller and how does it work?

Multiple impellers are used in series to generate the high pressures necessary to feed the boiler. Sometimes referred to as Between-Bearing Pumps (BB Pumps), bearings on each end support the shaft of the pump. The impellers are in between the bearings.

What are the different types of boiler feedwater pumps?

There are two main styles of pumps for boiler feedwater service, and they can easily be differentiated by the position of its shaft. Most boiler feedwater pumps are multistage. Multiple impellers are used in series to generate the high pressures necessary to feed the boiler.

How does a turbo feed pump work?

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.

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