带有中间分液结构的管壳式冷凝器实验研究

对于管内凝结而言,为保持蒸汽在换热管进口段的高效换热状态而进行中间分液,改变气液两相流的流型,以保持相对较高的换热系数是"短管效应"理论的技术举措。结合传统冷凝器的结构,本文设计了一种用于实验研究的气液分离卧式管壳式水冷冷凝器。通过布置在冷凝器两端分程隔板处的不同直径和数量的分液管来观察其换热效果,并与传统冷凝器进行整体换热系数、出口冷凝液温度及压力损失三方面的实验对比。结果表明:具有不同直径和数量的分液管的冷凝器具有相似的热力性能;具有不同直径和数量的分液管的冷凝器整体换热系数比传统冷凝器要高,出口冷凝液温度比传统冷凝器要低,且具有较小的压力损失;在测试工况下,右侧开启1个0.5mm、1个1mm,左侧开启2个1mm、1个0.5mm分液管的冷凝器表现出较好的综合换热性能。

Experimental study of shell and tube condenser with middle liquid separation structure

As to condensation in tube, the technology initiatives of the "short-tube effect" theory to maintain a relatively higher heat transfer coefficient are making intermediate separation of the liquid, and changing the flow regimes of gas-liquid flow, in order to keep the steam in the heat exchange tube at the inlet section at a high-efficient heat transfer state. Combined with the structure of traditional condenser, a horizontal-water cooling shell and tube condenser with liquid separation structure was designed for experimental study in this paper. Heat transfer effect was observed by different diameters and numbers of liquid separation pipes arranged at pass partition plate of condenser. The results were compared to the traditional condenser with respect to the overall heat transfer coefficient, outlet condensate temperature and pressure loss. It was shown that the condensers with different diameters and numbers of liquid separation pipes have similar thermal performance. The overall heat transfer coefficient of condensers with different diameters and numbers of liquid separation pipes is higher than that of the traditional condenser. The outlet condensate temperature is lower than that of the traditional condenser and has lower pressure loss. The condenser with liquid separation pipes with the diameter of 0.5mm and 1mm at right side and the pipes with the diameter of 1mm, 0.5mm at left side has a better comprehensive heat transfer performance under the test conditions.