摘要
为了研究活性炭吸附挥发性有机物工艺过程参数,采用实验方法测得活性炭吸附苯的吸附量和吸附速率,然后在实验数据的基础之上建立了活性炭吸附苯过程的三维非稳态数学模型,并利用该数值模型研究了混合气体入口速度和入口苯浓度对吸附过程中U型管内的苯浓度、温度和压力分布的影响。结果表明:被吸附气体苯的入口浓度和混合气体入口速度增大时,多孔介质区及其周围区苯的摩尔分数和压力差均增大;与多孔介质区下游管段相比,上游的温度梯度更大,热阻更大;入口苯浓度越大,热量在多孔介质下游管段传递的距离更长。
In order to study the process parameters of activated carbon absorbing volatile organic compounds,the absorption capacity and absorption rate of activated carbon were obtained by the experimental method respectively. Based on the experimental results, the three dimensional unsteady mathematical model of activated carbon absorbing benzene was established. The effect of the inlet benzene concentration and mixture gas velocity on the benzene concentration,temperature and pressure distribution in the U type tube were investigated through this model. When the inlet velocity of mixture gas and the inlet concentration of benzene increased,the pressure difference and the benzene concentration of porous media and its surrounding areas increased. Higher temperature gradient and higher thermal resistance were observed in the upstream pipe section compared with the downstream pipe section of the porous media. Higer inlet benzene concentration leaded to longer heat transfer distance in downstream pipe section of the porous media.
出处
《环境工程》
CAS
CSCD
北大核心
2016年第S1期471-474,491,共5页
Environmental Engineering
基金
2014年度北京市教委科技发展计划重点项目暨北京市自然科学基金重点项目(B类)(KZ201410017019)
关键词
苯
数值模拟
活性炭吸附
benzene
numerical simulation
activated carbon adsorption
