Steam Boiler

Boiler feed water treatment

In this lesson, we will study boiler feed water treatment. before study the treatment of boiler feed water it is necessary to know the necessity of treatment of boiler feed water.

Necessity of boiler feed water treatment

All natural sources of water contain impurities as well as dissolved gasses. The amount of these impurities depends on type of water source and location.

Why it is necessary to treat the raw water?

Raw water coming from different sources contains dissolved salts and un-dissolved or suspended impurities. It is necessary to remove harmful salts dissolved into the water before feeding it to the boiler.
Because-
The deposition of dissolved salts and suspended impurities will form a scale on the inside wall of different heat-exchangers and thus there will create excessive pressure and thermal stress (due to uneven heat exchange across the wall of heat-exchanger) inside the heat-exchangers, which may lead to the explosion and serious hazards for boilers.
The harmful dissolved salts may react with various parts of boiler through which it flows, thereby corrode the surfaces.

Corrosion may damage the tubes of boiler.
Corrosion damage may occur to turbine blades.
Hence, boiler feed water treatment is very much required to remove such dissolved and suspended impurities from water before feeding it to boiler.

That’s why the boiler feed water must be treated before feeding it to boiler.

Arrangements for Boiler Feed Water Treatment

For continuous supply of feed water to boiler, after removing impurities, there are two types of plant generally incorporated. These are:
Demineralization plant (D M plant)
Reverse Osmosis plant (R O plant)

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