Abstract: Vapor quality in static flash evaporation was studied experimentally,using aqueous solution of NaCl at a mass fraction range of 5%-26%,an initial temperature range of 74-104℃,an initial aqueous solution height range of 0.1-0.3 m,and a superheated range of 0.79-42 K.The results showed that increasing concentration of aqueous NaCl solution reduced the vapor quality at a given initial solution temperature and a final equilibrium flash chamber pressure.The effect of concentration became weak at a given superheat(ΔT)and the same aqueous solution height.Vapor quality increased with increasing initial aqueous solution height,but at the same time,vapor quality produced by per unit mass of aqueous NaCl solution decreased.Vapor quality increased linearly with increasing superheat.Based on the experimental results,the dimensionless correlation for vapor quality in static flash evaporation was established.

Key words: static flash evaporation, aqueous NaCl solution, vapor quality, process variables

摘要： 对不同初始条件下NaCl溶液静态闪蒸过程中蒸发质量的变化规律进行了实验研究,实验过程中溶液初始质量分数为5%～26%,初温为74～104℃,初始液位高度为0.1～0.3 m,过热度为0.79～42 K。结果表明:在以ΔT_s为过程参量时,溶液闪蒸蒸发质量随NaCl初始质量分数的增加明显下降;以ΔT为过程参量时,相同初始液位高度,不同初始质量分数NaCl溶液闪蒸蒸发质量相差较小;增加初始液位高度虽可增加总蒸发质量,但使单位质量溶液闪蒸蒸发质量下降;闪蒸蒸发质量随过热度增大而呈近似线性增加。综合分析静态闪蒸过程中主要过程参量对蒸发质量的影响,在实验基础上,提出蒸发质量的量纲1关联式。

关键词: 静态闪蒸, NaCl溶液, 蒸发质量, 过程参量