Internal Boiler Water Conditioning
By William F. Harfst
The application of water treatment chemicals to the boiler feedwater or directly to the boiler constitutes the internal boiler water conditioning process. The goal of this procedure is to control scale formation, mitigate corrosion, and maintain steam quality and purity. The required chemical balances that are selected for a given steam plant are based on a unique set of feedwater characteristics and operating conditions. These balances are maintained by means of various water quality control tests, and appropriate adjustments in chemical feed and blowdown control. Regardless of the pretreatment methods that may be used such as filtration, ion exchange softening, and deaeration, the final adjustment of the boiler water chemistry must be accomplished by the use of internal treatment. When properly applied and controlled, the internal chemical treatment program will extend the useful life of the plant equipment and avoid costly maintenance and repair procedures in the water and steam cycle.
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