换热设备中水垢的物相分析及与换热面的界面结合状态(程林)

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t _,J Ew:?*B0换热设备水垢的物相分析及与换热面的界面结合状态

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3ZG R z h0【作者】程林 【作者单位】山东大学空热科学与工程研究中心

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【论文摘要】 通过对不同厚度层的水垢进行 X 射线分析,发现了任何时候水垢都包含有两种不同结晶结构形态的 CaCO3组成:一种是六方晶结构(方解石),另外一种是斜方晶结构(文石),一般来讲六方晶是主体部分。本研究利用混合粉末法推导出一定量计算公式,利用 X 射线衍射数据及本公式可方便地计算这两种碳酸钙的组成比例。进一步的研究表明这两种晶体结构的 CaCO3的比例是随结垢层的厚度变化的,其中斜方晶与六方晶的比例随结垢层的厚度增加而增加后趋于平稳。用高倍 SEM 观察水垢与壁面的结合状态,结果表明水垢的附着强烈受壁面材质的影响,对于镀镍的界面污垢沉积的速度较慢,但在对于存在氧化铁的情况,水垢会快速沉积并增厚。对此,本研究从晶格匹配的观点出发,提出了"过渡界面"的概念,认为晶格类型及点阵常数类似或接近的物质更容易结合在一起。控制"过渡界面"的形成有助于抑制水垢的附着与长大。水利论文2B1~Rs3K^*S

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【英文论文摘要】 The crystallization fouling with different thickness on the surface of heat exchanger was investigated by X-ray analyzing.The results show the phase constitution of fouling layer is two kinds of crystalline structure CaCO3,one is calcite with hexagonal structure and the other is aragonite with orthorhombic structure.The calcite is the main portion in fouling layer.The relative contents of the two types CaCO3 are changed with the thickness of fouling layer.From outside to inner of fouling layer,the relative content of hexagonal CaCO3 is increased.The equations for quantitative evaluation of the contents of calcite and aragonite was derived based on experimental calibration.Further SEM observation indicated that the adhesion of the fouling was strongly affected by the surface of heat exchanger.If the surface was coated by Ni,then amount of adhering fouling is limited.However,if the surface was covered by Fe2O3,then the adhering rate of fouling is quickly. Therefore,a concept of"tran...更多sitional interface"is suggested from the view point of lattice matching. It is thought that the phases with similar crystalline structure or lattice parameter more easily connected.The scaling process could be controlled by inhibiting the formation of"transitional interface".  还原水利论文qV/Dxf

@|-BYy0|"C0【论文关键词】 析晶污垢; 定量方程; 过渡界面; 晶格匹配水利论文vm&hX-B-Y
【英文论文关键词】 Crystallization Fouling; Transitional Interface; Lattice matching; Quantitative equation水利论文9{;wo*mm0jmp

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TAG: 程林 水垢 换热 相分析 设备
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