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首页> 外文期刊>Heat Transfer Asian Research >Condensation Heat Transfer on Tubes in Actual Flue Gas (Parametric Study for Condensation Behavior)
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Condensation Heat Transfer on Tubes in Actual Flue Gas (Parametric Study for Condensation Behavior)

机译：实际烟气中管子上的冷凝传热（冷凝行为的参数研究）

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In order to improve boiler efficiency, latent heat recovery from the flue gas is a very important concept. Condensation heat transfer on horizontal tubes was investigated experimentally by using flue gas from a natural gas boiler. The parametric studies concerning the effects of tube stages, gas velocities, SO_2 in the flue gas, and Teflon-lined tubes were conducted at a wide range of tube surface temperature. The heat transfer was enhanced at the second stage due to the wake turbulence of the first stage. No significant decrease of the condensation in the second stage due to the condensate falling from the first stage could be observed. Even at the high gas velocity condition, the condensation pattern was similar to that observed in previous low gas velocity experiments. The effect of SO_2 in the flue gas on the condensation behavior could not be observed. The heat and mass transfer behaviors on stainless-steel and Teflon-lined surfaces were well predicted with the analogy correlation. The above results suggested that the Heat and mass transfer were dominated by the convection and diffusion process on the gas side.
机译：为了提高锅炉效率，从烟气中回收潜热是非常重要的概念。利用天然气锅炉的烟气，对水平管上的冷凝传热进行了实验研究。在大范围的管子表面温度下进行了有关管级，气体速度，烟道气中的SO_2和特氟龙衬里管的影响的参数研究。由于第一阶段的尾流湍流，第二阶段的传热增强。由于冷凝水从第一级掉落，第二级冷凝水没有明显减少。即使在高气体速度条件下，冷凝模式也类似于先前的低气体速度实验中观察到的模式。烟气中的SO_2对冷凝行为没有影响。具有类比相关性，可以很好地预测不锈钢和特氟隆衬里表面上的传热和传质行为。以上结果表明，传热和传质主要由气体侧的对流和扩散过程决定。

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