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水平管降膜蒸发中CO2化学解吸的理论研究

发表时间:2013-04-30  浏览量:1161  下载量:340
全部作者: 杨洛鹏,徐喆轩,张晓红,胡华伟
作者单位: 大连理工大学海洋能源利用与节能教育部重点实验室
摘 要: 为有效降低不凝气(non-condensable gas,NCG)对水平管降膜蒸发过程的影响,提高降膜蒸发(multi-effect distillation,MED)的传热效率,建立了水平管降膜蒸发中CO2化学解吸的数学模型,通过对实际低温多效蒸发海水淡化装置的计算模拟,得到了CO2的解吸速率在单个蒸发器内不同单元以及不同蒸发器内的分布规律,通过与MED海水淡化厂实际运行数据对比分析,验证了本数学模型的正确性。研究结果表明:蒸发温度是制约CO2解吸速率的主要参数,液膜中传质系数和化学反应速率随着蒸发温度的降低而降低,使得CO2解吸速率降低;降膜蒸发过程中不凝气的化学解吸量是不凝气解吸量的重要组成,化学解吸出的不凝气对管内的冷凝传热有显著影响。
关 键 词: 热能工程;CO2化学解吸;水平管降膜蒸发;数值模拟;化学反应
Title: Theoretical research on chemical desorption of CO2 in a horizontal-tube falling film evaporation
Author: YANG Luopeng, XU Zhexuan, ZHANG Xiaohong, HU Huawei
Organization: Key Laboratory of Ocean Energy Utilization and Energy Conservation, Ministry of Education, Dalian University of Technology
Abstract: In order to effectively reduce negative influence of non-condensable gas (NCG) on horizontal-tube falling film evaporation and improve the thermal conductivity efficiency of falling film evaporation, a model of CO2 chemical desorption was presented. The CO2 desorption rate distributions in different units of individual evaporator and different evaporators were obtained by simulating an actual multi-effect distillation (MED) setup. Compared with practical operation data of a MED desalination plant, the presented models were proved to be reliable. The results indicated that the CO2 desorption rates decreased stage by stage mainly due to the reduction of the mass transfer coefficients and the chemical reaction rate with a decrease in evaporation temperatures in evaporators. The evaporation temperature was the key factor influencing the CO2 chemical reaction rate. The chemical desorption rates were identical to the physical desorption rates. The released NCG had significantly negative effect on the internal condensation.
Key words: thermal engineering; CO2 chemical desorption; horizontal-tube falling film evaporation; mathematical simulation; chemical reaction
发表期数: 2013年4月第8期
引用格式: 杨洛鹏,徐喆轩,张晓红,等. 水平管降膜蒸发中CO2化学解吸的理论研究[J]. 中国科技论文在线精品论文,2013,6(8):747-751.
 
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