摘要
针对许多生产工艺过程的VOCs排放呈现出大风量、低浓度和间歇排放的特点,本研究以活性炭和异丙醇为例进行了一种针对低浓度气体的吸附加中温再生二次吸附净化工艺的研发。结果表明,在入口浓度约400 mg/m3时,活性炭在30℃和70℃的平衡温度之间存在约4%的吸附有效工作容量。对再生能耗对比发现,进口VOCs浓度越低,新工艺节能效果越明显。吸附穿透曲线表明,随着过滤风速的减小,穿透前能处理的风量随之增加。对于低浓度吸附净化过程,采用中温脱附可以有效浓缩有机气体,最大可达5.62倍。以上结果表明,对于低浓度吸附净化过程,采用中温脱附加二次吸附可起到经济有效地浓缩有机气体的作用。
Considering the characteristics of the waste gas from some manufacture process,which have large flow rate loaded with low-concentration VOCs and are emitted intermittently,this study focused on development of a new treatment technology based on adsorption of low-concentration VOCs combined with mesothermal regeneration and second adsorption. Activated carbon and isopropanol were utilized on the research. The results show that when inlet concentration is about 400 mg / m3,there is a 4% available working capacity for the activated carbon between 30℃ and 70℃. The results of comparing the energy consumption of activated carbon regeneration show that the lower inlet concentration,the higher effect of energy saving. The volume of cleared gas for per kg carbon increases with the decline of superficial velocity. In general,results indicate that mesothermal desorption with insecond adsorption is economical way to concentrate the low concentration organic gas flow.
出处
《环境工程学报》
CAS
CSCD
北大核心
2016年第1期283-288,共6页
Chinese Journal of Environmental Engineering
基金
同济大学大学生创新实践训练计划(SITP)
关键词
大风量
低浓度VOCs
吸附等温线
穿透曲线
中温脱附
large air flow
low-concentrated VOCs
adsorption isotherm
adsorption breakthrough curves
mesothermal desorption
