环道实验研究碳酸钙结垢规律

摘要

我国出产的石油大多数属于重油，结垢问题严重。通过设计环道实验，发现随着流速的增大，碳酸钙结垢诱导期加长，结垢速率减小，渐进污垢热阻减小；表面温度越高，结垢速率越大。之前的文献中很少讨论碱度对换热表面结垢的影响，本文对不同硬度及碱度含量的水质进行了实验研究发现，碱度越大结垢越严重；随着溶液硬度的增大，结垢速率先是增大，待增大至一定浓度时降低。%The produce d oil in our country is mostly heavy oil, with serious scaling problem. According to the annular pipeline test, with the increasing of the flow rate, induction period becomes longer, the scaling rate decreases and scaling resistance reduces; the higher the temperature on surface, the higher the scaling rate. While, there is little discussion about the effect of alkalinity on scaling of heat exchanging surface in literature. In this paper, an experimental research on water with diverse hardness and alkalinity contents was carried out. The research results show that, the higher the alkalinity, the heavier the scaling. With the increasing of the hardness of solution, scaling rate firstly increases, and then decreases when the hardness reaches to some extent.