活性炭变压吸附二氧化硫的传热传质规律  

Heat and mass transfer in pressure swing adsorption of sulfur dioxide gas by activated carbon

作　　者：刘峥[1,2] 李立清[1] 黄贵杰[1,3] 姚小龙[1,4] 

机构地区：[1]中南大学能源科学与工程学院,湖南长沙410083 [2]广西大学环境学院,广西南宁530004 [3]广州地铁设计研究院有限公司环境工程所,广东广州510010 [4]清华大学环境学院,北京100084

出　　处：《中南大学学报（自然科学版）》2015年第5期1959-1966,共8页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(20976200;21376274)~~

摘　　要：采用两床五步式变压吸附工艺,研究活性炭固定床变压吸附处理SO2过程中的传热传质规律和脱附状态下脱附气的浓缩率的变化规律。研究结果表明：不同吸附高度的温度曲线随变压吸附循环的周期数改变而变化。在实验条件下,传质区主要集中在高度H=0.08~0.15 m处;随着吸附柱高度的增加,气相组分物质质量浓度逐渐降低,并且在400个周期以后开始达到稳定。在床层高度0.60 m以上没有SO2气体存在。SO2在吹扫脱附阶段和真空脱附阶段的不同脱附时刻的脱附气浓缩率均随变压吸附过程先快速升高,然后趋于稳定,当达到稳定时,SO2的脱附气浓缩率随脱附时间的增加而降低。在实验条件下,变压吸附各阶段的最佳时长如下：均压段为3 s,吸附段为170 s,吹扫脱附设为15 s,真空脱附为180 s;脱附气的SO2平均浓缩率为2。The heat and mass transfer in a fix bed of activated carbon（AC） for SO2 adsorption and the variation of the ratio of desorption gas condensability were investigated based on a double bed five steps pressure swing adsorption（PSA）. The results show that the temperature curves of different heights change with the change of periodicity, and that mass transfer mainly occurs in the area of 0.08-0.15 m. The concentration of gas phase composition decreases gradually with the increase of adsorption column height. It enters a stability stage after 400 cycles. No SO2 is detected when the bed height is higher than 0.60 m. During the purge desorption and vacuum desorption stage, the ratio of desorption gas condensability increases, then tends to stable, and finally declines with the increase of desorption time. In experiment conditions, the best operation time for each stage are adsorption with 170 s, purge desorption with 15 s, vacuum desorption with 180 s, and balance pressure with 3 s. The average condensability of SO2 in desorption gas can achieve 2.0.

关 键 词：变压吸附 温度 气相质量浓度 脱附气 浓缩率 

分 类 号：X51[环境科学与工程—环境工程]