化工学报 ›› 2008, Vol. 59 ›› Issue (10): 2448-2454.

• 传递现象 • 上一篇    下一篇

烧结型多孔管的污垢特性

刘阿龙;徐宏;孙岩;许佳寅;张莉;王学生   

  1. 华东理工大学机械与动力工程学院,化学工程联合国家重点实验室
  • 出版日期:2008-10-05 发布日期:2008-10-05

Fouling characteristics of sintered porous surface tubing

LIU Along;XU Hong;SUN Yan;XU Jiayin;ZHANG Li;WANG Xuesheng   

  • Online:2008-10-05 Published:2008-10-05

摘要:

在恒热流密度情况下,以CaSO4溶液为介质,研究了烧结型多孔管在池沸腾过程中的污垢特性。结果表明:与光滑管相比,多孔管在不同浓度的CaSO4溶液中都具有阻垢特性,浓度增大污垢热阻的渐近值增大,但当浓度增大到一定程度后,污垢曲线由渐近线型过渡到直线型。通过对两种换热管表面和污垢表面的扫描电镜(SEM)分析,对多孔管的阻垢机理进行了解释。发现多孔表面的CaSO4晶体形状为六棱柱体,晶粒更加细小,约为光滑表面晶粒尺寸的1/2.5,且污垢层更薄。

关键词:

烧结型多孔管, 污垢, 污垢热阻, 硫酸钙

Abstract:

The experiments on the fouling characteristics of sintered porous surface tubing(SPST)in pool boiling were carried out,with CaSO4 solution as a working fluidThe experimental results showed that SPST possessed better antifouling ability compared with smooth surface tube(SST).The asymptotic fouling thermal resistance increased with increasing concentration of solutionHowever,transition of fouling curve from asymptotic line to straight line was observed when concentration reached a specific levelAn analysis of tubing surface and fouling surface of SPST and SST was made by scanning electronic microscopy(SEM)to interpret the antifouling mechanism of SPSTIt was observed that the crystal grain of CaSO4on SPST surface was hexaprismshaped and 1/2.5 size of that from SST surface with a thinner fouling layer.

Key words:

烧结型多孔管, 污垢, 污垢热阻, 硫酸钙