LiCl溶液-空气吸收物系相平衡线的绘制及应用  

Determination and application of phase equilibrium curves of aqueous LiCl solution and air

作　　者：张青[1,2] 柳建华[1] 邬志敏[1] 张良[1] 高文忠[1] 

机构地区：[1]上海理工大学制冷研究所,上海200093 [2]上海海洋大学食品学院,上海201306

出　　处：《上海海洋大学学报》2010年第4期560-566,共7页Journal of Shanghai Ocean University

基　　金：国家"八六三"高技术研究发展计划(2007AA05Z211);上海市重点学科建设项目(S30503)

摘　　要：以液体除湿空调系统中使用的吸湿性LiCl盐溶液和待处理空气组成的吸收体系为研究对象,分析等温及绝热吸收过程中吸收系统的相平衡关系并绘制相平衡线,以便作为设计填料吸收塔的基础。结果表明等温吸收相平衡线仅受进塔溶液温度的影响,绝热过程受浓度的影响更大。绝热吸收过程中水蒸气的凝结潜热和溶液的微分溶解热等热效应导致气液传质势差迅速降低,因而无须使用过高的填料高度。在利用绝热吸收相平衡线确定所需吸收溶液流量时,仅由全塔物料衡算得出的溶液流量偏小,应同时考虑热平衡关系才可得出较为合理的溶液流量。The phase equilibrium curves of aqueous LiCl solution and air under isothermal and adiabatic absorption processes were plotted respectively to design the absorption towers which are used in liquid desiccant air conditioning systems. The researches showed that the former curves were influenced by the temperature of the solution while the latter were influenced mainly by the concentration of the solution. The latter curves also showed that the latent heat of condensation of water vapor and the differential enthalpy of dilution of the solution caused the absorption system to reach the heat and mass balance situation much faster than isothermal process,which meant that lower height tower could be adopted for adiabatic processes. The required solution’s volumetric flux was calculated using the phase equilibrium curves and the results showed that the mass and heat balance relations should be considered simultaneously to get reasonable results,while only mass balance relations were used in traditional calculating methods.

关 键 词：液体除湿空调 填料塔 相平衡线 等温吸收 绝热吸收 

分 类 号：TK5[动力工程及工程热物理—热能工程]