温度对换热器析晶污垢形成的影响

Effect of temperature on formation of crystalline fouling on heat exchanger surface

利用X射线衍射(XRD)和扫描电镜(SEM)等手段研究了温度对碳酸钙析晶污垢形成类型与微观结构的影响。结果表明:温度不但影响析出的碳酸钙污垢的类型,也影响析出相的晶格常数和析出粒子尺寸;温度较低时碳酸钙污垢主要为方解石晶相,随着温度的升高析出的文石晶相逐渐增加;同时低温沸腾产生的扰动可以有效地减小碳酸钙污垢粒子的聚集尺寸。

The effect of temperature on the crystalline structure and morphology of calcium carbonate fouling was investigated by X-ray diffraction analysis and SEM observation. The experimental results indicated that temperature not only affected the crystalline type of fouling, but also affected the lattice parameter and particle size of the precipitated phase. Calcite was the main precipitated phase at a lower temperature, and the amount of aragonite would increase with increasing temperature. The disturbance induced by low temperature boiling could reduce the size of aggregating fouling particle.