Corrosion of tubes used in thermosyphon heat exchanger for waste heat recovery system: A case of internal surface

被引:4
|
作者
Terdtoon, P [1 ]
Charoensawan, P [1 ]
Chaitep, S [1 ]
机构
[1] Chiang Mai Univ, Dept Engn Mech, Fac Engn, Chiang Mai 50200, Thailand
关键词
D O I
10.1080/014576301750215779
中图分类号
O414.1 [热力学];
学科分类号
摘要
The purpose of this article is to study the internal corrosion of tubes used in a thermosyphon heat exchanger for waste heat recovery: The thermosyphons used M were made of aluminum, copper iron, copper with internal spiral grooving, and stainless steel with internal spiral grooving. Different corrosion-protection methods M were used, including tube burning and the addition of inhibitors. The thermosyphons were installed in the hear exchangers and rested over a period of 4,000 hrs at working temperatures of 150, 250, and 350 degrees C. The Arrhenius and fouling models of Kern and Seaton,l were employed to analyze the data. It was found from experiments that the average corrosion rate was inversely proportional to time and depended on the temperature. The results were then compared with those taken in standard untreated tubes. Results show ed that the most appropriate material for thermosyphons in waste heat recovery systems is copper tubing with a grooved internal surface. The most appropriate corrosion protection for this material is the 20-ppm inhibitor Nu(2)HPO(4) added to the working fluid of water: Fouling thermal resistance can be obtained from the correlation Z(fouling) = 177.78(1 - e(-0.0001t)), where Z(fouling) is the fouling thermal resistance and t is time.
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页码:18 / 27
页数:10
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