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首页> 外文期刊>Heat Transfer Engineering >Application of Heat Transfer Enhancement on Vertical Thermosyphon Reboilers Using Tube Inserts
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Application of Heat Transfer Enhancement on Vertical Thermosyphon Reboilers Using Tube Inserts

机译：管插入件在立式热虹吸再沸器中强化传热的应用

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摘要

Vertical thermosyphon reboilers and evaporators are widely used in the process industries. However, increasing the thermal efficiency of these units is very difficult. They are commonly used for about 70% of all evaporation duties in chemical industries. The flow in these units depends on the amount of buoyancy created by vaporization. The flow rate is therefore related not only to heat transfer rate, but also to evaporation, friction, and static pressure loss. The hydrostatic heat present at the base of a vertical thermosyphon reboiler suppresses boiling, creating a sub-cooled region. At the base of the tube bundle, this region length sometimes approaches a significant percent of tube length. Because single-phase convective heat transfer is the dominant heat transfer mechanism in this region, tube inserts can be used to promote heat transfer without blocking flow. In this article, using a simulation model that has been validated against the result of HTFS software, the effect of using different types of tube inserts in a sub-cooled zone of a vertical thermosyphon reboiler on the thermal performance of this unit is discussed.
机译：立式热虹吸再沸器和蒸发器广泛用于过程工业。但是，增加这些单元的热效率非常困难。它们通常用于化学工业中所有蒸发任务的70％。这些单元中的流量取决于汽化产生的浮力。因此，流速不仅与传热速率有关，而且与蒸发，摩擦和静压损失有关。立式热虹吸再沸器底部的静水热量抑制沸腾，形成过冷区域。在管束的底部，该区域长度有时接近管长度的很大百分比。由于单相对流传热是该区域的主要传热机制，因此可以使用管插件促进传热而不会阻塞流动。在本文中，使用已针对HTFS软件的结果进行了验证的仿真模型，讨论了在垂直热虹吸再沸器的过冷区中使用不同类型的管插入件对该装置的热性能的影响。

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