Non-isothermal crystallization kinetics of dynamic ice slurry production by vacuum method

doi:10.11949/j.issn.0438-1157.20170336

Abstract

Abstract:

Ice slurry treated with sodium chloride was produced by vacuum method. The feasibility of describing the crystallization behaviors of ice slurry based on the non-isothermal crystallization kinetic model, Jeziorny and Mo method, was theoretically proved. The relationships between the crystallization time and the ice packing fraction (IPF) were measured and the non-isothermal crystallization kinetic equations were developed. Experimental results indicated that the non-isothermal crystallization kinetics of ice slurry formation fit the Jeziorny and Mo model very well. The values of the Jeziorny exponent n were between 0.473 and 0.525, indicating that the crystallization mechanisms were almost the same for different experimental conditions and the growth pattern of ice crystals was flake thickening. The change trends of the crystallization kinetic parameters, K_c, the crystallization time, t_0.25, and the cooling rate function, F(T), revealed that high cooling rate was beneficial to promote the formation of ice slurry and sodium chloride inhibited the growth of ice crystals.

Key words: ice slurry, crystallization, kinetics, vacuum ice, kinetic modeling

摘要：

以氯化钠水溶液为制冰溶液，采用真空法制备得到冰浆。从理论上论证非等温结晶动力学模型Jeziorny法和Mo法用于描述冰浆结晶行为的可行性。通过实验测定不同结晶时间下的冰浆含冰率，并建立了冰浆生成过程的非等温动力学方程。研究结果表明：Jeziorny法和Mo法可很好地描述冰浆的非等温结晶过程；Jeziorny模型指数n的值在0.473~0.525间，表明不同实验条件下的结晶机理基本一致，冰晶呈片状增厚生长；Jeziorny模型中的结晶动力学参数K_c、t_0.25和Mo模型中的冷却速率函数F（T）的变化规律均表明高冷却速率可促进冰浆的形成，同时氯化钠的添加会在一定程度上抑制冰晶生长。

关键词: 冰浆, 结晶, 动力学, 真空制冰, 动力学模型

CLC Number:

TK02

LIU Xi, ZHUANG Kunyu, HUANG Cheng, LI Xuelai. Non-isothermal crystallization kinetics of dynamic ice slurry production by vacuum method[J]. CIESC Journal, 2017, 68(8): 3071-3081.

刘曦, 庄焜煜, 黄成, 李学来. 真空法动态制冰的非等温结晶动力学[J]. 化工学报, 2017, 68(8): 3071-3081.

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