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Treatment
Boiler Water Treatment
A boiler generates steam and is used to drive
turbines to generate electricity. The steam reduced by the boiler is also
used for various purposes including: Air Conditioning systems, heating hot
water, process applications, driving steam engines and marine application.
Large boilers are used for commercial, industrial, utility and many more
applications.
Two types of
boilers commonly used are
- Firetube boilers wherein
the combustion gas passes inside the boiler tubes and heat is
transferred to water between the tubes and the outer shell.
- Watertube boiler wherein
the boiler water passes through the tubes, while the exhaust gases
remain in the shell sides, passing over the tube surfaces. Usually,
watertube boilers are used where high steam pressures are required.
Depending on the sources of heat, Water Heat Recovery Boiler (WHRB) and Heat
Recovery Steam Generators are commonly used.
The major problems in the functioning of the boiler systems are both
Corrosion and Deposition. Their effects are Scaling and Sludging, which lead
to elevated metal temperature causing failures in tubes and restricted steam
generation. Moreover, Pitting and corrosion of pipes and tubes surfaces
result in leakage of tubes, which significantly reduces steam production and
system efficiently. The main objectives of effective boiler water treatment
are
- Uninterrupted heat
transfer
- Generation of high
quality steam.
- Corrosion and scale
control
Typical boiler
water treatment program
Oxygen Scavengers
These are used to remove the dissolved oxygen from
the boiler feed water. They thus control the corrosion in the feed water
tank and the condensate return lines. VASU offers specifically formulated
products based on Sodium Sulphite, DEHA (Diethyl Hydroxylamine), Tannins,
Hydrazine, etc. These products reduce the levels of dissolved oxygen and
also passivate the metal surface.
Sludge/Scale Conditioners
These products react with the alkalinity of the
boiler water. Hence, neutralizing the hardness of the water and preventing
scale formulation. VASU offers products based on phosphate and
poly-phosphate as well as poly acrylate, maleic acrylate co-polymer for
conditioning of alkaline water.
Alkalinity Builders
Sometimes it is necessary to add an alkalinity
booster to set right the boiler water chemistry to prevent scale formation.
Another benefit of adding this pH booster is that it helps to protect the
feed water tank, feed line and flew gas economizer from acid corrosion.
VASU's pH booster is a high performance product for this application.
Additional Product
Availability
- Multifunctional single
drum product for boilers, which is a combination of oxygen scavenger, pH
booster, sludge/scale conditioner and condensate line corrosion control.
- Condensate Line Corrosion
Control: A single neutralizing amine or a blend of amines with different
distribution ratios is tailor-made to protect various parts of the steam
line. We also provide a blend of neutralizing and filming amines to
protect the pipe network
