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首页> 外文期刊>Desalination: The International Journal on the Science and Technology of Desalting and Water Purification >Experimental study on equilibrium waterfilm concentration in static flash evaporation of aqueous NaCl solution
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Experimental study on equilibrium waterfilm concentration in static flash evaporation of aqueous NaCl solution

机译：NaCl水溶液静态闪蒸平衡水膜浓度的实验研究。

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摘要

Experimental study on equilibrium waterfilm concentration in static flash evaporation of aqueous NaCl solution was presented. Equilibrium waterfilm concentration was defined as the concentration of aqueous NaCl solution in a flash chamber at equilibrium time after each flash. Experiments were carried out with the initial waterfilm concentration varied from 0 to 0.264 (saturation), separating height from 0.115 to 0.415 m, and superheat from 1.8 to 43.4 K. Results indicated that both evaporation and steam-carrying effect influenced the change of equilibrium waterfilm concentration. Equilibrium waterfilm concentration gradually increased with rising superheat until saturation. Meanwhile, minimum crystallization superheat was defined as the minimum superheat that made NaCl crystals separated out from waterfilm during the process of static flash evaporation when the equilibrium waterfilm concentration was in a saturated state. Results showed that the minimum crystallization superheat decreased with the rising initial waterfilm concentration or the decreasing separating height. Finally, a calculating formula of equilibrium waterfilm concentration with an empirical constraint was set up, and the relative error between experimental and calculating equilibrium waterfilm concentrations varied between -14.6% and 8.7%.
机译：提出了NaCl水溶液静态闪蒸过程中平衡水膜浓度的实验研究。平衡水膜浓度定义为每次闪蒸后平衡时间闪蒸室中NaCl水溶液的浓度。进行了实验，初始水膜浓度从0到0.264（饱和度），分离高度从0.115到0.415 m，过热度从1.8到43.4K。结果表明，蒸发和载水效应都影响平衡水膜的变化。浓度。平衡水膜浓度随着过热度的升高而逐渐增加，直至饱和。同时，将最小结晶过热定义为当平衡水膜浓度处于饱和状态时，在静态闪蒸过程中使NaCl晶体从水膜中分离出来的最小过热。结果表明，最小结晶过热度随初始水膜浓度的升高或分离高度的降低而降低。最后，建立了具有经验约束的平衡水膜浓度计算公式，实验与计算的平衡水膜浓度之间的相对误差在-14.6％至8.7％之间。

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