自然科学版 英文版
自然科学版 英文版
自然科学版 英文版

您目前所在的位置:首页 - 期刊简介 - 详细页面

中南大学学报(自然科学版)

Journal of Central South University

第46卷    第9期    总第253期    2015年9月

[PDF全文下载]    [Flash在线阅读]

    

文章编号:1672-7207(2015)09-3535-05
不同吸附剂在沼气脱碳提纯中的分离性能
王志祥,易红宏,唐晓龙,赵顺征,左嫣然,高凤雨,张波文

(北京科技大学土木与环境工程学院,北京,100083)

摘 要: 采用椰壳活性炭、5A和13X分子筛作为吸附剂,动态配气CO2/CH4混合气体作为模拟沼气,研究不用吸附剂及不用原料气配比条件下的CO2/CH4混合气的吸附分离性能,对吸附饱和的13X分子筛分别进行真空(4.5 kPa)脱附再生和热力(300 ℃)脱附再生。研究结果表明:在常温常压下,13X分子筛对混合气中CO2的穿透吸附容量为3.21 mmol/g,对CO2/CH4混合气体的分离系数可达10,明显高于5A分子筛和椰壳活性炭的分离系数;减小混合气中CO2的分压,其穿透时间也随着减小,且吸附容量的减小幅度大于分压的减小幅度;真空脱附再生后的13X分子筛吸附分离性能只能恢复到原来的40%左右,而热力脱附再生后分离性能效果较好。

 

关键字: 活性炭;分子筛;吸附;穿透曲线;再生

Adsorption separation performance of different absorbents for biogas decarbonization upgrading
WANG Zhixiang, YI Honghong, TANG Xiaolong, ZHAO Shunzheng, ZUO Yanran, GAO Fengyu, ZHANG Bowen

School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China

Abstract:Dynamic adsorption experiments were carried out using coconut shell activated carbon, with 5A and 13X molecular sieves as adsorbents and gas mixtures with different CO2/CH4 volume ratios as methane simulation. Vacuum (4.5 kPa) desorption and thermal desorption (300 ℃) on fully adsorbed 13X molecular sieve were carried out. The results show that the breakthrough adsorption amount of CO2 on 13X molecular sieve is 3.21 mmol/g, and the separation factor of CO2/CH4 gas mixtures is up to 10, significantly higher than those of the 5A molecular sieve and coconut shell activated carbon at room temperature and pressure. The breakthrough time becomes smaller, which accompanies the decrease of CO2 partial pressure, and the decrease rate of adsorption amount is larger than that of partial pressure. The adsorption separation performance of vacuum desorption regeneration of 13X molecular sieve can only be restored to about 40% of the original one, while thermal desorption regeneration can achieve better results.

 

Key words: activated carbon; molecular sieve; adsorption; breakthrough curve; regeneration

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
版权所有:《中南大学学报(自然科学版、英文版)》编辑部
地 址:湖南省长沙市中南大学 邮编: 410083
电 话: 0731-88879765(中) 88836963(英) 传真: 0731-88877727
电子邮箱:zngdxb@csu.edu.cn 湘ICP备09001153号