论文部分内容阅读
对机械蒸汽压缩式(MVC)海水淡化中的沸腾传热与海水淡化性能进行理论分析。以竖直管式蒸发冷凝器建立具有不同盐度的海水核态沸腾传热模型,对海水的传热性能、热流密度、淡水产率以及海水淡化的能耗进行系统分析。为避免单位压缩功和淡水产率不能同时达到最优,设定单位压缩功不变。计算结果表明,海水盐度的增加对海水淡化的系统性能不利:海水盐度增加,沸腾换热系数αe、总传热系数、热流密度q和淡水产率m将有不同程度减小;增加沸腾压力和单位压缩功均有利于系统的传热性能,但单位压缩功的增大,增加了海水淡化的能耗。
Theoretical analysis of boiling heat transfer and seawater desalination in mechanical vapor compression (MVC) desalination was carried out. A vertical tubular evaporative condenser was used to establish the seawater nucleate boiling heat transfer model with different salinities. The heat transfer performance, heat flux, freshwater yield and seawater desalination energy consumption were systematically analyzed. In order to avoid unit compression work and freshwater productivity can not achieve the best at the same time, set the unit compression work. The results show that the salinity of seawater is unfavorable to the system performance of seawater desalination: the salinity of seawater increases, the boiling heat transfer coefficient αe, the total heat transfer coefficient, heat flux q and freshwater yield m will decrease to some extent; Pressure and unit compression work are conducive to the heat transfer performance of the system, but the unit compression work increases, increasing the desalination energy consumption.