第18卷第2期 2018年4月 ea
反应与分离
过程工程学报
The Chinese Joumal of Process Engineering
Vol.18 No.2 Apr.2018
DOI: 10.12034/j.issn.1009-606X.217233
沼气变压吸附剂吸附性能比较
李艳"，于光林”，汪诚文12
(1.北京国环清华环境工程设计研究院有限公司，北京100084；2.清华大学环境学院，北京100084)）
要：研究了工程上常用的3种吸附剂CO2吸附剂硅胶、13X分子筛和碳分子筛在高压(0.1~1MPa)下对CO2和CH4的吸附容摘
量、稳定性和选择性，以确定其在沼气变压吸附分离中应用的可行性，结果表明，硅胶的吸附稳定性非常好，0.1MPa时吸附选择性系数为8~10，能有效分离CH4-CO2：13X分子筛对CH4和COz吸附容量最高、吸附选择性最好，重复使用5次CO2的吸附容量略有下降；以CH4的损失率作为评价标准时，13X分子筛吸附CH4的损失率最低.降压不能使被碳分子筛吸附的CH4完
全解吸，吸附位不能充分释放，不适用于CH4与CO2的分离、关键词：变压吸附；吸附剂；硅胶；13X分子筛：碳分子筛
中图分类号：X382.1
文献标识码：A
文章编号：1009606X(2018)020301-07
Comparation of Adsorption Properties of Pressure Swing Sorbents for Biogas
Yan LI',Guanglin YU2,Chengwen WANG12
(I. Beijing Guohuan Tsinghua Environmental Engineering Design & Research Institute Co., Ltd., Beijing 100084, China
2. School ofEnvironment, Tsinghua University, Bejing 100084, China)
Abstract: The adsorption capacity, adsorption stability and adsorption selectivity under high pressure (0.1~1 MPa) of three sorbents, silica gel, 13X molecular sieves and carbon molecular sieves, which were potentially used in biogas upgrading engineering, were investigated. The results showed that among the three adsorbents, silica gel had the best adsorption stability, and its adsorption selectivity coefficient under 0.1 MPa was between 8 and 10 which can achieve an effective separation of CO2 from CH4. 13X molecular sieve had the highest adsorption capacity for both CO2 and CH4, in addition, 13X molecular sieves had a significantly improved selectivity however, the adsorption capacity for CO2 decreased continually when reused 5 times. When taking the environmentally important CH slip into account, 13X molecular sieve was the lowest. The desorption isotherms of carbon molecular sieves were always above the enaeaarngroer sasooee aosee eao osaa aosoe depressurization, so it was not a good candidate for COz/CH4 separation.
Key words: pressure swing adsorption; sorbent; silica gel; 13X molecular sieves; carbon molecular sieves
1
前言
变压吸附(PressureSwingAdsorption，PSA)因能耗
投资少，在合成氨变换气(CO228%，CO 低、
1%~3%，H242%~50%，N218%，其它2%)脱碳、尿素生产中CO2提纯、天然气脱碳、CO2捕集中应用非常广泛II-]，利用PSA脱除混合气中的CO2，关键在于脱碳吸附剂的选择.吸附剂的吸附容量、选择性、再生程度
收稿日期：201705-09，修回日期：2017-0731
基金项目：国家科技支撑计划项目(编号：2014BAC28B00)
决定产品气的产量、纯度.PSA脱碳过程中常用的吸附剂有分子筛、活性炭、硅胶、活性氧化铝、碳分子筛，或几种吸附剂不同形式的组合，
沼气是将废弃生物质(禽畜类便、农业废弃物、工业有机废弃物、生活污水和生活垃圾等)在厌氧情况下通过微生物作用产生的一种环境友好、清洁的可燃性气体，主要成分为CHa(50%~60%)和CO2(30%~40%)及少量其它组分(1%~3%).利用PSA提纯沼气在工程上的
作者简介：李艳(1975-)，女，陕西省渭南市人，博士，高级工程师，化学工程专业，Tel:13366586527，E-mail:13366586527@163.com；汪诚文，通讯
联系人, Tel: 010-62796721, E-mail: wangcw@tsinghua.edu.cn.
引用格式：李艳，于光林，汪减文，沼气变压吸附剂吸附性能比较，过程工程学报，2018,18(2)：301-307.
LiY,YuGL, WangCw.Comparation ofAdsorption PropertiesofPressure Swing SorbentsforBiogas (in Chinese).Chin. J.Process Eng.,28 18(2); 301307, DOI: 10.12034/j.issn.1009606X.217233
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