高校化学工程学报2011，Vol.25Issue(1)：30-36,7.
纳米颗粒强化氨水鼓泡吸收性能的机理与影响因素
Mechanism and Influence Factors of Nano-Particles Enhancing Ammonia Bubble Absorption Performance
摘要
Abstract
Based on the Danckwerts interface refresh matrix and Langevin equation, the influences of nanoparticles on the heterogeneous phase film transfer process and liquid phase transfer process of ammonia bubble absorption were analyzed preliminarily, which can explain the mechanism of nanoparticles enhancing ammonia bubble absorption performance reasonably. According to the analysis, it was found that the process of nanoparticles enhancing bubble absorption performance includes two sub-processes of liquid phase transfer enhancement and interface transfer enhancement. Since the nanoparticles induce the interface Marangoni convection, the enhancing coefficient of interface transfer is higher than that of liquid phase transfer. According to the enhancement mechanism, the experimental studies of the possible factors influencing on the nanoparticles enhancing ammonia bubble absorption performance were conducted. The results show that the stability of the nanofluid is one of the key factors for the enhancement of the absorption process, and using nanofluid with FeO or Al2O3 nanoparticles of 0.1％ (mass fraction) individually can have better enhancing absorption effect. The enhancing effect of nanofluid with nanoparticles of 0.1％FeO+0.1％ CTAB is less than that of nanofluid with nanoparticles of 0.1％FeO+0.1％ACT. The effective absorption ratio increases with the increase of the concentration of the base ammonia solution; and keeping other conditions unchanged, the absorption ratio increases with increasing ammonia gas flow, but the changes of effective absorption ratio show ruleless. The enhancing effect also increases with the increase of solution temperature, and the difference of the inlet NH3 pressure or initial pressure in the absorber has great influence on the whole absorption process too. This paper provides a reference for subsequent research on mechanism of nanoparticles influencing the transfer process of gas in solid-liquid suspending system, and also for the mini-type absorber design of ammonia absorption refrigerator.关键词
纳米颗粒/氨水/鼓泡吸收/机理/影响因素Key words
nano-particles/ ammonia/ bubble absorption/ mechanism/ influence factor分类
化学化工引用本文复制引用
盛伟,武卫东,张华,刘辉,洪欢喜..纳米颗粒强化氨水鼓泡吸收性能的机理与影响因素[J].高校化学工程学报,2011,25(1):30-36,7.基金项目
国家自然科学基金(50606027) （50606027）
上海市研究生教育创新计划项目(JWCXSL0901) （JWCXSL0901）
上海市重点学科建设项目(S30503). （S30503）
