海水淡化过程中相变微胶囊相变放热过程分析

Analysis of Microcapsules Latent Heat Release Process in Desalination

为研究相变微胶囊对真空闪蒸过程的影响规律,对相变微胶囊在真空中的放热过程进行数学建模,并采用Ligthill方法对模型求解,分析了相界面位置、热流量、蒸发速度、蒸发量和时间的关系,并对3种相变材料Ba(OH)_2·8H_2O、Na CH_3COO·3H_2O和石蜡进行了放热过程对比分析。结果表明,相变微胶囊在真空环境中石蜡放热速度最快,约为38 ms。热流量Ba(OH)_2·8H_2O最大,约为60 m W。通过蒸发速度和产水量分析,加入Ba(OH)_2·8H_2O相变微胶囊后,放热时间由10 ms提高到67 ms,蒸发量提高84.5%。

To study phase change microcapsules latent heat release process in vacuum environment, mathematical model was set up and the Ligthill＇s method was employed to solve the model. Relationship between the solid-liquid interface position, heat flow and evaporation rate, evaporation capacity and time was analyzed. When compared the Ba（OH）2· 8H2O, NaCH3COO·3H2O and paraffin wax, paraffin wax release heat fastest, about 38 ms, and the heat flow of Ba（OH）2·8H2O is largest, about 60 mW. According to the solution, when added Ba（OH）2·8H2O phase change microcapsule, the evaporation time enhanced from 10 ms to 67 ms, and the water productivity increased by 84.5%.