【摘要】 通过对浓海水鼓泡蒸发过程进行传质动力学与能量转化热力学分析,揭示出卤水鼓泡蒸发与气象条件之间的内在联系。采用双膜理论确定了蒸发传质过程的五个步骤,阐明了鼓泡操作可以大幅提高相界面积与液相传质系数,风可以显著提高气相传质系数。分析了浓海水敞开系统与周围环境之间的能量转化,论述了鼓泡操作能强化浓海水与空气之间的传热,揭示出随着浓海水波美度的提高,传热方向渐渐发生逆转,并使鼓泡效率逐步降低。分析所得结论与实验结果相吻合,这些结论对于鼓泡晒盐工艺的优化、建模与推广具有重要参考价值。更多还原

【Abstract】 Through analysis of mass transfer kinetics and energy conversion thermodynamics,this paper attempts to reveal the intrinsic relationships between brine bubbling evaporation and meteorological conditions.The classic double-film theory is applied to define the five steps of evaporation mass transfer.And therefore,it is clarified that the bubbling operation can significantly improve the interfacial area and the liquid-phase mass transfer coefficient,and wind can intensify gas—phase mass transfer coefficient.The energy conversions between the concentrated seawater and the surrounding environment are analyzed in detail.Furthermore,it is explained that the bubbling operation can enhance the heat transfer between the concentrated seawater and the air.However,it is convinced that with the increase of brine Baume degree,the heat transfer direction is gradually reversed,and the bubbling efficiency is gradually reduced.The conclusions coincide with the experimental results,and have important reference values for the optimization,modeling and promotion.更多还原