Abstract: BR0.015F plate heat exchanger was used to investigate the fouling characteristics using the water from Songhua River.A. The fouling characteristics were studied under different experimental conditions. Scanning electron microscope was used in the observation of the fouling surface of the heat exchanger. The results showed that the fouling gradually accumulated without induction period. The fouling resistances reduction decreased with the increase of flow velocity. The fouling resistances were greater when the temperature of the cooling water was at 27.5—28.5 ℃. The fouling attached to the heat transfer surface with some crystal-like salts.

Key words: plate heat exchanger, fouling, scanning electron microscope

摘要： 为研究板式换热器在天然水下的污垢特性，实验采用BR0.015F型板式换热器，研究了其在不同的流速和温度下的污垢特性，用扫描电镜观察了已经结垢的换热表面。结果表明：此板式换热器松花江水的污垢类型为渐进型且不存在诱导期，随着流速的增大污垢热阻降低的幅度减小。冷却水温度在27.5～28.5 ℃时污垢热阻较大，温度升高污垢热阻降低；换热表面的混合污垢成片的附着于换热面，有少量的难溶盐析出的晶体生成。

关键词: 板式换热器, 污垢, 扫描电镜