高盐海水中硫酸钙结垢趋势预测及验证

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倪兵,沈胜强,陈石,刘晓华.高盐海水中硫酸钙结垢趋势预测及验证[J].,2019,59(5):471-479

高盐海水中硫酸钙结垢趋势预测及验证

Prediction and verification of calcium sulfate scaling tendency in high salinity seawater

DOI：10.7511/dllgxb201905006

中文关键词:CaSO4 海水饱和指数结垢脱盐

英文关键词:CaSO4 seawater saturation index scaling desalination

基金项目:国家自然科学基金资助项目(重点项目51336001)；国家科技支撑计划资助项目(2014BAB09B002014BAB04B01).

作者	单位
倪兵,沈胜强,陈石,刘晓华

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中文摘要:

采用Oddo-Tomson饱和指数法对CaSO4的结垢趋势和Mg2+浓度对CaSO4结垢的影响进行预测．研究了温度为90 ℃时，不同盐度的海水在静态和动态条件下，钛管表面CaSO4的结垢情况，得出了Oddo-Tomson饱和指数法在高盐海水中结垢趋势的预测范围．结果表明，盐度为6%时，采用Oddo-Tomson饱和指数法预测CaSO4的结垢趋势与天然海水的实验结果吻合；盐度为8%时，实验结果与预测结果一致，通过溶度积判断，天然海水中有少量CaSO4析出，但没有附着在金属表面；盐度为10%时，升高温度后，CaSO4晶体自发析出，Oddo-Tomson饱和指数法无法准确给出该过程的预测．

英文摘要:

The scaling tendency of CaSO4 and influence of Mg2+ concentration on CaSO4 deposition are predicted by Oddo-Tomson′s saturation index method. When the temperature is 90 ℃, the precipitation of CaSO4 in diverse salinity seawater is studied under static condition and dynamic condition on the surface of titanium tube. The prediction range of scaling tendency in high salinity seawater is obtained for Oddo-Tomson′s saturation index method. The results show that when the salinity is 6%, the scaling tendency of CaSO4 predicted by Oddo-Tomson′s saturation index method is highly coherent with the experimental results of natural seawater; when the salinity is 8%, the predicted scaling tendency of CaSO4 is coherent with the experimental results, and according to the rules of solubility product, a small amount of CaSO4 precipitates from natural seawater, but does not adhere to the metal surface; when the salinity is 10%, CaSO4 crystals spontaneously precipitate after elevating temperature, therefore Oddo-Tomson′s saturation index method can not correctly predict this process.

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