小型冰浆机工作过程动态特性

Dynamic crystallization characteristics of the working process of small type ice slurry maker

动态冰蓄冷是储能领域中广受制冷界重视的潜热储冷技术,基于平板刮削方式设计并搭建了小型动态制备冰浆实验装置,通过测试制冰溶液的动态结晶降温曲线、不同结晶时刻的含冰率和冰晶当量直径,分析了结晶时间、载冷剂温度、添加剂种类与浓度、刮削速度等因素对冰浆制备过程动态结晶特性的影响。结果表明:刮削速度低于200 r/min,溶液结晶过冷度随刮削速度的增大而增大,冰浆的含冰率以及冰晶粒径均随结晶时间的增加而增大,在冰晶粒径较大时刮削作用引起冰晶颗粒聚并、破碎,导致冰晶粒径增大减缓甚至减小;随添加剂浓度的增大,冰浆含冰率增大速率与冰晶粒径增大量均有所减小,且强极性无机化合物对冰晶生长的抑制效果好于乙二醇等醇类化合物。

Dynamic ice storage is a latent heat storage technology in the field of energy storage.A small type experimental device for dynamic preparation of ice slurry was designed and built based on the flat scraping method.The effects of crystallization time,coolant temperature,type and concentration of additives,and scraping speed on the dynamic crystallization characteristics of the ice slurry were analyzed by testing the dynamic crystallization cooling curve of the ice making solution,and the ice content with crystal equivalent diameter at different crystallization moments.The results show that the scraping speed is lower than200r/min,and the degree of crystallization supercooling of the solution increases with the increase of the scraping speed.The ice content of the ice slurry and the ice crystal grain size increase with the crystallization time.When the ice crystal size is large,the scraping action causes the ice crystal particles to coalesce and break,which causes the degree of ice crystal size increase to slow down or even reduce.With the increase of additive concentration,the increase rate of ice content in ice slurry and the increase of ice crystal size were both decreased,and the effect of strong polar inorganic compounds on ice crystal growth was stronger than that of glycol and other alcohol compounds.