为了降低乙二醇脱水浓缩工艺中的能耗，利用工业低温余热，基于金属表面与二元混合溶液不同液体分子之间相互作用力的差异，设计了一种多孔金属毛细芯强化乙二醇水溶液浓缩的蒸汽侧抽真空平板式毛细芯蒸发系统。基于此方法，对质量分数为10%的乙二醇水溶液进行了蒸发浓缩实验。结果表明，抽真空毛细蒸发存在3种蒸发状态；溶液进口温度高于70℃时蒸发效果明显，且真空度与浓缩效果呈正相关。系统在0.088 MPa以上时有较为明显的浓缩效果；入口浓度升高对浓缩效果具有促进与抑制两方面作用，最佳浓缩效果的入口质量分数范围为35%~42.5%。该方法在传统闪蒸的基础上，进一步利用了多孔结构毛细芯金属表面能对二元溶液分子作用力的差异，从而造成2种溶液组分相对挥发度增大，一定程度上强化了二元溶液的分离效果。

In order to reduce energy consumption in concentrating ethylene glycol aqueous solution and utilize low-temperature industrial waste heat,a vapor-side vacuuming flat capillary vaporization system is designed for concentrating ethylene glycol aqueous solution,based on the differences in interaction between metal surface and different liquid molecules in binary mixed solution.Based on this method,an evaporation concentration experiment is performed for a 10% ethylene glycol aqueous solution.The results show that there are three evaporation states for vacuuming capillary evaporation.The evaporation effect is obvious when the temperature of solution at inlet is higher than 70℃,and the vacuum degree shows a positive correlation with the concentrating effect.This system has a more obvious concentration effect when the pressure surpasses 0.088 MPa.An increasing inlet concentration has the effects of both promoting and inhibiting the concentration effect,and the optimal concentration effect can be achieved when the inlet concentration is in the ranges of 35%-42.5%.Based on the traditional flashing method,this method utilizes the differences interaction between metal surface and different liquid molecules in a binary mixed solution,resulting in an increase in the relative volatility of two solution components,which enhances the separation of the binary solution.

郝良伟(1994-),男,硕士生