What is the main function of a demineralizer in feedwater treatment?

The main function of a demineralizer in feedwater treatment is to remove ionized contaminants from the water. Demineralizers utilize ion exchange processes, which involve the exchange of undesirable ions (such as calcium, magnesium, sulfate, and chloride) with benign ions (typically sodium and hydroxide) in order to purify water. This process ensures that the water is free from conductive impurities, which is critical in applications such as steam generation in boilers, where the presence of minerals can lead to scaling, corrosion, and reduced efficiency.

The need for demineralization arises because untreated feedwater often contains various dissolved solids that could negatively impact operational efficiency and maintenance of boiler systems. By effectively removing these ionized substances, demineralizers help maintain water quality and contribute to the longevity and safety of the equipment in which the water is utilized.