同轴撞击流浓缩器的浓缩性能研究

从实验和理论上对撞击流浓缩器(ISC)进行了研究。实验主要研究了空气进口温度、空气进口流量、液滴加速管的长度对ISC容积蒸发系数的影响。研究结果表明:ISC的容积蒸发系数随空气进口流量的增加、空气进口温度的升高而增大;并证明,宜使用较短的加速管。在理论分析的基础上建立了ISC浓缩溶液的理论模型,借助基于该模型的数值计算,模拟了ISC内液滴的蒸发过程,通过与实验值的比较证明了模型的正确性。

Study on Concentrating Characteristic of Coaxial Two Impinging-stream Concentrator(ISC)

Based on the coaxial two impinging-stream principle, a new device for solution concentration was built and studied experimentally and theoretically. The experimental study was focused on the effects of inlet air temperature, inlet air flow rate and accelerating pipe length on ISCs volumetric evaporative coefficient. The experimental results show that the ISC has a relatively high volumetric evaporative coefficient, which increases with the rising of inlet air flow rate and the rising of inlet air temperature. Two ISCs with different accelerating pipe lengths were studied and the results show that the SIC is better to have a shorter accelerating pipe. A theoretical model was suggested based on the consideration of mass transfer, heat transfer and momentum transfer between the liquid droplets and the hot air. Using the model a concentration process of the cane sugar solution in the ISC was calculated and the result was compared with the experimental result. The maximum relative error between the two results was less than 6.6%, which indicates that the suggested model is reliable.