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对增湿除湿型太阳能海水淡化装置中填充空心塑料小球作为堆积床的传质系数进行了实验测试,并与其他材料堆积床的传质系数进行了比较。介绍了测试装置的结构和工作过程,给出了传质系数随不同运行参数的变化关系。实验结果表明,该空心塑料小球由于具有较大的润湿表面和内部具有储水多孔材料,因而具有较高的蒸发传质系数。在系统冷却水和喷淋温度分别为25℃和80℃时,传质系数比使用方木条时提高了约8%。实验结果还说明,喷淋量及循环风量对传质系数的影响一般是正向的,喷淋量及风速增加,传质系数将增加,但风速达到一定程度后,增加循环风量使传质系数增加幅度变小。
The mass transfer coefficients of hollow plastic pellets packed in humidifying and dehumidifying solar seawater desalination units as packed beds were tested and compared with the mass transfer coefficients of other materials packed bed. The structure and work process of the test device are introduced. The relationship between mass transfer coefficient and different operating parameters is given. The experimental results show that the hollow plastic pellets have a high evaporation mass transfer coefficient due to their large wetting surface and the internal water-storing porous material. When the system cooling water and spray temperature were 25 ℃ and 80 ℃ respectively, the mass transfer coefficient was increased by about 8% when using square sticks. The experimental results also show that the effect of spray volume and circulating air volume on the mass transfer coefficient is generally positive. When the spray volume and wind speed increase, the mass transfer coefficient will increase. However, when the air velocity reaches a certain level, the circulating air volume is increased to increase the mass transfer coefficient The rate of decrease.