Low temperature multi-effect evaporation (LT-MEE) seawater desalination systems with top brine temperature lower than 70℃ have attracted attention in recent years.A method for performance estimation of LT-MEE is prop...Low temperature multi-effect evaporation (LT-MEE) seawater desalination systems with top brine temperature lower than 70℃ have attracted attention in recent years.A method for performance estimation of LT-MEE is proposed,and a formula is built for a typical LT-MEE configuration.Excluding complex properties of working fluids and details of heat and mass transfer processes,this formula involves only simple algebraic operations,thus provides a convenient way to evaluate the water production of LT-MEE for different motive heat source conditions and design parameters.Comparing the formula prediction with the data from both rigorous models and references,it indicates that the formula can give good results in wide parameter ranges.Although this method is proposed based on a typical LT-MEE configuration,it is also applicable to other LT-MEE configurations and thermal desalination systems.展开更多
文摘Low temperature multi-effect evaporation (LT-MEE) seawater desalination systems with top brine temperature lower than 70℃ have attracted attention in recent years.A method for performance estimation of LT-MEE is proposed,and a formula is built for a typical LT-MEE configuration.Excluding complex properties of working fluids and details of heat and mass transfer processes,this formula involves only simple algebraic operations,thus provides a convenient way to evaluate the water production of LT-MEE for different motive heat source conditions and design parameters.Comparing the formula prediction with the data from both rigorous models and references,it indicates that the formula can give good results in wide parameter ranges.Although this method is proposed based on a typical LT-MEE configuration,it is also applicable to other LT-MEE configurations and thermal desalination systems.
文摘针对低温多效蒸发海水淡化系统顺流进料方式的特点,在其工艺流程中添加预热流程,建立相应的Aspen Plus流程图进行模拟计算。通过计算得出:当效数为两效时,不宜采用预热处理;对于四效蒸发器,随着预热温度的增加,造水比显著提高;增加蒸发器的效数,预热对造水比增加的贡献更加明显,但比传热面积亦增大。应用Aspen Process Economic Analyzer流程经济分析软件对低温多效海水淡化系统顺流进料有无预热流程进行经济评估,结果表明:添加有预热流程的系统,可以缩短投资回报期,投资总收益较为可观。
