| 摘要: |
| 结霜会对不同类型气化器造成长效性能的衰减。为研究套管结构在强化传热与表面结霜的效果，本文搭建了实验台，在普通传热管内加装套管，以液氮为工质，根据不同套管内径（Φ6、Φ8、Φ10 mm）及入口流量，设计了12组实验工况进行研究，获得翅片管表面不同测点处温度、霜层厚度及翅片管出口流体温度等参数。结果表明：入口流量为2.5 g/s时，普通传热管及套管内径为Φ6、Φ8、Φ10 mm结构的管内出口温度分别为193、205、200、199 K，相比于无套管结构，套管结构有效延缓了霜层生长，在3种规格套管中，Φ6 mm套管延缓霜层生长的效果较好；入口流量为2.5、3.5、4.5 g/s时，使用内径为Φ6 mm的套管结构及较低的入口流量可延缓翅片表面结霜。 |
| 关键词: 翅片管气化器 结霜特性 套管结构 强化换热 |
| DOI： |
| Received:May 25, 2021Revised:September 22, 2021 |
| 基金项目:国家重点研发计划（2017YFC0805601）资助项目。 |
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| Effect of Double-wall Heat Transfer Tube on Frosting Characteristics of Finned-tube Vaporizer |
|
Dong Chao1, Chen Shuping1, Zhu Ming2, Jin Shufeng1, Wu Zongli1
|
| (1.School of Petrochemical, Lanzhou University of Technology;2.China Special Equipment Inspection and Research Institute) |
| Abstract: |
| The degradation of the long-term performance of different types of vaporizers is caused by frosting. An experimental platform was built to study the effect of a double-wall heat transfer tube on heat transfer enhancement and frosting. In the experiment a tube was added to the inner side of the ordinary heat transfer tube and liquid nitrogen was used as the working medium. Twelve working conditions were designed based on different inner diameters (Φ6 mm, Φ8 mm, Φ10 mm) of double-wall heat transfer tubes and inlet flow. The temperature at different measuring points on the surface of the finned tube, the frost thickness, and the fluid temperature at the outlet of the finned tube were tested. The results show that when the inlet flow is 2.5 g/s, the outlet temperatures of the ordinary heat transfer tube, and double-wall heat transfer tube with inner diameters of Φ6 mm, Φ8 mm, and Φ10 mm are 193 K, 205 K, 200 K, and 199 K, respectively. This means that compared with the ordinary heat transfer tube, the double-wall heat transfer tube effectively delays the frost growth. Among the three tube specifications, the double-wall heat transfer tube with an inner diameter of Φ6 mm has a better effect on delaying the growth of frosting. When the inlet flow is 2.5 g/s, 3.5 g/s and 4.5 g/s, using a double-wall heat transfer tube with an inner diameter of Φ6 mm, the lower inlet flow can delay frosting on the fin surface. |
| Key words: finned-tube vaporizer frosting characteristic double-wall heat transfer tube heat transfer enhancement |
