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结垢与腐蚀现象是影响热水水质稳定和热水系统正常运行的重要因素,主要原因是输送了不稳定的水。水质的稳定性与碳酸钙在水中的溶解平衡密切相关,单纯以水的总硬度来判断水质稳定具有局限性。主要介绍了饱和指数、稳定指数和碳酸钙沉淀势这3种判断水质稳定的方法,并详细介绍了各种指数的计算方法,通过分析比较得出,饱和指数可以定性判断水的结垢和腐蚀倾向;稳定指数基本可以定量判断水质结垢和腐蚀程度,比饱和指数接近实际;碳酸钙沉淀势可以计算得到每升水中需要溶解或沉淀的碳酸钙数量,可做定量判断。
Fouling and corrosion phenomena are important factors affecting the stability of hot water quality and the normal operation of hot water systems, mainly due to the transport of unstable water. The stability of water quality is closely related to the dissolution equilibrium of calcium carbonate in water. Judging the stability of water quality simply by the total hardness of water has limitations. This paper mainly introduces three methods of judging water quality, such as saturation index, stability index and calcium carbonate precipitation potential. The calculation methods of various indices are introduced in detail. By analyzing and comparing, saturation index can qualitatively determine water scaling and corrosion Tendency; stability index can quantitatively determine the degree of water quality scaling and corrosion, the saturation index closer to reality; Calcium carbonate precipitation potential can be calculated per liter of water to be dissolved or precipitated calcium carbonate quantitative judgment can be done.