变压吸附处理丙酮废气及其吸附过程数值模拟  

Pressure Swing Adsorption for the Treatment of Acetone-containing Waste Gas and Simulation of the Adsorption Step

作　　者：李海龙[1] 李立清[1,2] 郜豫川[3] 张剑峰[3] 高招[1] 唐琳[1] 

机构地区：[1]湖南大学环境科学与工程学院,长沙410082 [2]中南大学能源科学与工程学院,长沙410075 [3]四川天一科技股份有限公司变压吸附分离工程研究所,四川成都610025

出　　处：《天然气化工—C1化学与化工》2007年第3期11-16,共6页Natural Gas Chemical Industry

基　　金：国家自然科学基金(20376019;20576028)

摘　　要：在常温下,以活性炭C40/4为吸附剂采用两床四步骤变压吸附过程对丙酮废气进行净化和回收,待变压吸附过程稳定以后测定了吸附柱内气相浓度分布。建立了物质守恒、吸附平衡以及LDF数学模型,应用差分方法借助计算软件ATHENAVIUALWORKBENCH对模型进行了数值解,数值计算结果与实验结果很好地相吻合。利用该模型考察了吸附柱内浓度分布的动态行为以及轴向扩散系数、传质系数、温度、空塔气速等参数对浓度分布的影响,为变压吸附处理丙酮等挥发性有机气体过程的设计、预测和优化提供依据。A small-scale two-column four-step pressure swing adsorption （PSA） process using activated carbon C40/4 as adsorbent was applied at normal temperature to separate and recover acetone from exhaust gas. Concentration distribution of acetone in the adsorption column was measured when the processes were stable. The mathematical model that composed of mass equilibrium, adsorption equilibrium and linear driving force model was establishedand calculated by chemical engineering software Athena Visual Workbench. The simulation results were in good agreement with the experimental data. The dynamic behavior of concentration distribution in the adsorber and the effects of some parameters such as axial diffusion coefficient, mass transfer coefficient, temperature and gas vacant speed in adsorption column on the concentration distribution were explored using the developed model. The obtained results provided a reference for designing, forecasting and optimizing the PSA process for disposing of VOCs such as acetone.

关 键 词：活性炭 丙酮 变压吸附 数值模拟 VOCS 

分 类 号：TQ028.1[化学工程]