Abstract: The experiment research on the influences of water conditions on CaSO4 fouling characteristics. The study investigated the influences of NO3? and Cl? on CaSO4 fouling characteristics such as flow velocity，inlet temperature，working fluid concentrations，chemical equations and anion concentrations. The results showed that anions increased the formation of CaSO4 fouling in a certain range，and the increase of fouling formation was affected by flow velocity，had no obvious relationship with inlet temperature and working fluid concentrations. The results of scanning electron microscopy showed that the fouling in the test tube where working fluid contained large amounts of NO3? was dense and thick，and working fluid precipitated in the form of calcium sulfate crystals，which clustered together. In the circular tube where，CaSO4 solution contained large amounts of Cl?，the fouling turned out to be loose and uniform，and working fluid solution precipitated in the form of calcium sulfate crystals，which did not cluster.

Key words: CaSO4 fouling, anion, fouling characteristics, crystal morphology

摘要： 实验研究了水质工况对硫酸钙污垢特性的影响，在管内流速、入口温度、工质浓度、化学方程式和阴离子浓度5个方面分别研究氯离子和硝酸根离子对硫酸钙结垢特性的影响。结果表明，阴离子对硫酸钙污垢的形成有一定的促进作用，但这种促进作用受实验管段流速的影响，流速越大，促进作用越小，与管段入口温度和工质浓度没有明显关系。电镜观察结果显示，含有大量硝酸根离子的硫酸钙溶液在不锈钢圆管内结垢致密且厚重，工质溶液以条状和块状混晶析出硫酸钙晶体，晶体紧密的聚集。含有大量氯离子的硫酸钙溶液在不锈钢圆管内结垢疏松且均匀，工质溶液以条状析出硫酸钙晶体，晶体间没有明显的聚集现象。

关键词: 硫酸钙污垢, 阴离子, 污垢特性, 晶体形态