大型低温多效蒸发海水淡化装置传热过程热力损失分析  

Analysis of thermodynamic losses of heat transfer process in large-scale LT-MED desalination plant

作　　者：沈胜强[1] 周士鹤[1] 牟兴森[1] 郭亚丽[1] 

机构地区：[1]大连理工大学能源与动力学院,辽宁省海水淡化重点实验室,辽宁大连116024

出　　处：《化工学报》2014年第9期3366-3374,共9页CIESC Journal

基　　金：国家自然科学基金重点项目(51336001);高等学校博士学科点专项科研基金项目(20110041110032)~~

摘　　要：基于低温多效蒸发海水淡化装置的各种阻力和海水沸点升高(BPE)关联式,计算了海水淡化装置中流动阻力、海水沸点升高等造成的传热过程热力损失,分析了各项热力损失在各效蒸发/冷凝器中的分布、随蒸发/冷凝器数量的变化规律等。结果表明:产水量、浓缩比和加热蒸汽温度等参数均保持不变的前提下,总的热力损失随着装置的蒸发/冷凝器数量而增加;BPE引起的热力损失占最大比例,但流动阻力引起的热力损失不可忽略。通过对海水淡化装置热力损失的分析,提出了低温多效蒸发海水淡化装置'小温差、低流阻、饱和态、高敏感'的工作特征理论。Based on correlations of flow resistance and sea water boiling point elevation （BPE） applicable to the low-temperature multiple effect distillation （LT-MED） desalination plant, the thermodynamic losses in a large-scale LT-MED desalination plant were calculated and analyzed, including the distribution and proportion of various thermodynamic losses caused by BPE and flow resistances. The effect of the number of evaporator/condenser on thermodynamic losses was studied. The result indicates that, for a large-scale LT-MED desalination plant with constant production capacity, the total thermodynamic losses increases with the number of effects. The thermodynamic loss caused by BPE constitutes the highest proportion while that by the flow resistances can not be ignored. According to the analysis on the loss, the operating characteristics of LT-MED desalination system are summarized as small temperature difference, low pressure drop, saturation states and high sensitivity.

关 键 词：海水淡化 多效蒸发 传热 热力学过程 热力损失 沸点升高 工作特征 

分 类 号：TK124[动力工程及工程热物理—工程热物理]