Influences of working conditions on heat transfer characteristics in shell side of LNG spiral wound heat exchangers

doi:10.11949/j.issn.0438-1157.20171304

Abstract

Abstract:

To clarify the influences of working conditions and longitude tube pitch on heat transfer characteristics in shell side of LNG spiral wound heat exchangers, the analysis on the propane flow boiling in the shell side is performed. The experimental conditions cover the vapor quality of 0.2-1.0, the heat flux of 4-10 kW·m^-2, and the mass flux of 40-80 kg·(m²·s)^-1. The results indicate that, with the increase of vapor quality, the heat transfer coefficient (HTC) increases initially, and then falls off sharply at the vapor quality of 0.8-0.9. With the increase of heat flux, the HTC increases at the vapor quality smaller than 0.8, while decreases at the vapor quality larger than 0.8. With the increase of mass flux, the HTC increases at the low heat flux condition, while presents to be non-monotonous at the high heat flux.

Key words: LNG, spiral wound heat exchanger, two-phase flow, heat transfer, propane, shell side

摘要：

为了明确运行工况对LNG绕管式换热器壳侧换热特性的影响，开展了丙烷介质在壳侧的流动沸腾换热实验研究。干度0.2～1.0，热通量4～10 kW·m^-2，质流密度40～80 kg·（m²·s）^-1。实验结果表明：随着干度增加，传热系数先增大再减小，在干度0.8～0.9工况下达到最大值；随着热通量增大，传热系数在干度小于0.8的工况下逐渐增大，但是在干度大于0.8的工况下却逐渐减小；随着质流密度的增加，传热系数在低热通量工况下呈增加趋势，而在高热通量工况下呈现出非单调变化。

关键词: LNG, 绕管式换热器, 两相流, 传热, 丙烷, 壳侧

CLC Number:

TK124

DING Chao, HU Haitao, DING Guoliang, CHEN Jie, MI Xiaoguang, YU Sicong. Influences of working conditions on heat transfer characteristics in shell side of LNG spiral wound heat exchangers[J]. CIESC Journal, 2018, 69(6): 2417-2423.

丁超, 胡海涛, 丁国良, 陈杰, 密晓光, 余思聪. 运行工况对LNG绕管式换热器壳侧换热特性的影响[J]. 化工学报, 2018, 69(6): 2417-2423.

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