吸附式海水淡化循环热力学分析

THERMODYNAMIC ANALYSIS OF AN ADSORPTION DESALINATION CYCLE

建立双床吸附海水淡化基本循环的数学模型,以硅胶和沸石分子筛为吸附剂,计算并讨论循环的热力性能,结果表明:虽然基本吸附式循环的性能比和效率最大可较常规蒸发式海水淡化系统高约30%,但考虑传热温差、吸附床金属热容等实际因素后其性能并无优势,如能通过有效途径提高吸附床间的回热率,则可成倍提高该系统的热力性能。

The coupling of adsorption heat pump with seawater desalination is a new application of adsorption/desorption principle in desalination area, and the performance not very clear so far. The mathematical model of a basic double-bed adsorption desalination cycle was built, using silica gel and zeolite as adsorbent, and the thermodynamic performance of the cycle was calculated and discussed. The results showed that although the performance ratio and exergy efficiency of the basic cycle are maximally more than 30% higher than those of the conventional evaporation desalination system, its performance is not favorable after considering the practical factors such as heat-transfer temperature difference, heat capacity of bed metal, and so on. Higher heat recovet^y rate between/among the beds can lead to multiple growth of thermal performance.