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Brief:Calcium and magnesium hardness in boiler feedwater can undergo chemical reactions or crystallize at high temperatures, forming insoluble scale that adheres firmly to the boiler's heating surfaces. This scale is a poor conductor of heat, hindering heat transfer and potentially causing boiler tube rupture in severe cases. Furthermore, it can induce and exacerbate chemical corrosion of under-scale metals, posing a significant hazard. Although boiler condensate and feedwater undergo rigorous softening and desalination treatment, small amounts of calcium and magnesium hardness still enter the boiler water. If this hardness is not treated, it can also form scale, threatening the safe operation of the boiler. Currently, adding phosphate to the boiler water is the most suitable treatment method, with the reaction as follows:
Basic calcium phosphate is a soft water sludge that is easily discharged with boiler blowdown and will not adhere to the inside of the boiler to form scale.
