The conditioning and treatment of boiler water is essential in industrial facilities today. At the same time, for boiler water treatment to be effective, it must provide protection from corrosion, promote continuous heat exchange, and produce high-quality steam. For these objectives to be achieved, external and internal boiler water treatment are necessary.
External Boiler Water Treatment
In its most basic form, external boiler treatment involves reducing or removing impurities from the water that exists outside of the boiler. Typically, external treatment is needed when impurities in the feed water are too high for the boiler to handle. There are also many types of external treatment, such as deaeration, evaporation, softening, etc., and they can be used in different forms to remove impurities from the boiler system.
Internal Boiler Water Treatment
Internal boiler water treatment refers to the treatment process used for boilers that operate either at lower or moderate pressure, typically when significant amounts of condensed steam are being used for the feed water. Internal boiler water treatment serves several purpose, including:
1. To prevent feed-water hardness from precipitating onto the boiler metal and turning into scale
2. To condition any suspended matter so it does not adhere to the metal of the boiler
3. To create anti-foam protection, so only a reasonable concentration of suspended and dissolved solids end up in the boiler
4. To remove oxygen from the water, so enough alkalinity is created to prevent corrosion within the boiler