文章摘要
机械蒸汽压缩并流进料多效蒸发系统能耗的计算分析
Energy consumption analysis of parallel feed multi-effect distillation system with mechanical vapor compression
投稿时间：2020-01-14  修订日期：2020-05-07
DOI：
中文关键词: 机械蒸汽压缩  多效蒸发  脱盐  蒸发器  热力学过程
英文关键词: Mechanical vapor compression  multi-effect evaporation  desalination  evaporator  thermodynamic process
基金项目:国家自然科学基金重点项目(51936002),大连市科技创新基金重点学科重大课题(2019J11CY020)
作者单位邮编
李宜豪 辽宁省海水淡化重点实验室 116024
沈慧姝  
沈胜强* 辽宁省海水淡化重点实验室 116024
华维国  
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中文摘要:
      建立了并流进料机械蒸汽压缩(MVC)多效蒸发(MED)系统自平衡循环的热力过程模型,分析了并流进料MVC-MED系统中蒸发器效数、多效蒸发系统总温差、末效蒸发器二次蒸汽温度和等熵效率对系统比功耗(SPC)的影响。计算结果显示：SPC随系统总温差的增大而增加,蒸发器效数越少,SPC增加的速率越大；蒸发器效数较多时,SPC的增加速率随系统总温差的增大而提高。在系统总温差一定时,SPC随蒸发器效数增加而明显降低,但随着蒸发器效数的增加,SPC的减小幅度降低。在蒸发器效数一定时,SPC随末效蒸发器二次蒸汽温度的升高略有降低,其影响随着蒸发器效数的增加而减小。在系统总温差一定时,SPC随MVC等熵效率的增加而降低,在系统总温差较大时,MVC的等熵效率对SPC的影响更显著。
英文摘要:
      The thermodynamic process model of the parallel feed self-balancing cycle for multi-effect distillation system with mechanical vapor compression (MVC-MED) is established. The influences of different evaporator effect numbers, the total temperature difference of the MVC-MED system, the secondary steam temperature of the final effect evaporator and the isentropic efficiency of the MVC on the specific power consumption (SPC) of the parallel feed MVC-MED system are analyzed. The result shows that the SPC increases with the increase of total temperature difference of the system. The fewer evaporator effects there is, the greater the SPC acceleration rate becomes. When the number of evaporator effect is high, the acceleration rate of SPC increases with the raise of the total temperature difference of the system. The SPC decreases significantly with the increase of evaporator effect number at constant total temperature difference of the system. In the meanwhile, the variation range decreases at higher total temperature difference. The SPC decreases slightly with the rise of the secondary steam temperature in the final effect evaporator under constant evaporator effect number. And its influence decreases with more evaporator effects. The SPC decreases with the increase of the isentropic efficiency of MVC while the total temperature difference of the system is constant. The isentropic efficiency of MVC has more significant effect on SPC at the large total temperature difference of the system.
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