高通量管实验研究及再沸器设计

Experimental Study on High-flux Tube and Design of Reboiler

对铜光管和铜高通量管在不同的热流密度下的传热性能进行了实验研究,管内工质质量分数为70%的乙二醇水溶液,管外工质为饱和水蒸汽。结果表明,高通量管的强化传热性能非常明显,在实验范围内,高通量管的沸腾传热系数是光管的1.55~1.96倍,冷凝传热系数是光管的1.56~1.67倍,总传热系数是光管的1.54~1.87倍。对实验数据进行了分析,得到了高通量管在乙二醇水溶液和饱和水蒸汽中的传热关联式。根据此关联式,进行了高通量再沸器和普通再沸器的对比设计,高通量再沸器可节省换热面积33.5%。

The high-flux reboiler play an important role in ethylene glycol purification. However,the heat transfer enhancement performance of high-flux tube in organic working fluids and the design formula of high-flux reboiler were barely reported. The heat transfer performance of copper smooth tube and high-flux tube were studied experimentally at different heat flux with ethylene glycol solution whose mass fraction is 70 % inside tubes and saturated water vapor outside tubes. The results show that the heat transfer enhancement performance of high-flux tube is obvious. In the range of experiment,boiling heat transfer coefficient and condensation heat transfer coefficient provided by high-flux tube are1. 55 ~ 1. 96 times and 1. 56 ~ 1. 67 times that are provided by smooth tube,respectively,the overall heat transfer coefficient is 1. 54 ~ 1. 87 times compared with smooth tube. The heat transfer correlations in ethylene glycol solution and saturated water vapor for high-flux tube are obtained by analysis of experimental data. A high-flux reboiler and an ordinary roboiler are designed according to the heat transfer correlations respectively,the high-flux reboiler can save the heat transfer area by 33. 5 %.