吸收式热泵多效蒸发海水淡化热力性能研究

提出了两级吸收式热泵多效蒸发海水淡化工艺流程,并建立了系统的数学模型。计算分析了溴化锂溶液浓度和加热蒸汽温度对系统的造水比、生产单位淡水所需传热面积和吸收式热泵的热力系数的影响。研究结果表明,系统的造水比和吸收式热泵的热力系数随加热蒸汽温度和LiBr浓溶液浓度的降低而增大,生产单位质量淡水所需传热面积随加热蒸汽温度的降低而急剧增加;通过调整溴化锂溶液的浓度,能够实现对不同品质热源的利用;该系统不仅能够保证淡水不被溴化锂污染,而且其造水比明显优于喷射泵多效蒸发系统和多效蒸发系统。

THERMAL ANALYSIS OF MULTI-EFFECT DISTILLATION DESALINATION SYSTEM COMBINED WITH ABSORPTION VAPOR COMPRESSION

A process of multi-effect distillation desalination system combined with two-stage lithium bromide(LiBr)ab- sorption vapor compression(MED-ABVC)was presented,and its mathematical model and thermal analysis were per- formed.The effect of heating steam temperature and mass fraction of LiBr solution on the gained output ratio(GOR), specific heat area of distillation,and heat ratio of ABVC was explored.The results indicate that GOR and heat ratio of ABVC increase with the decrease of the heating steam temperature and the mass fraction of LiBr solution.Various heating resources with different quality can be effectively utilized by adjusting the mass fraction of LiBr solution.It is concluded that MED-ABVC not only prevent distillation from being polluted by LiBr,but also has better performance than MED- TVC and MED.