高比表面积活性炭吸附存储天然气性能研究  

Adsorption storage of natural gas on activated carbon with high specific surface area

作　　者：苏伟[1] 张玉[1] 吴菲菲[1] 孙艳[2] 

机构地区：[1]天津大学化工学院,天津300072 [2]天津大学理学院,天津300072

出　　处：《化学工程》2015年第2期20-24,共5页Chemical Engineering(China)

基　　金：国家自然科学基金资助项目(21206108);天津市应用基础与前沿技术研究计划资助项目(14JCYBJC21200)

摘　　要：天然气中少量乙烷和丙烷的存在会直接影响活性炭对天然气的吸附存储容量。为此,体积法测定了高比表面积活性炭对甲烷、乙烷和丙烷的吸附等温线,吸附温度分别为283,293,303和313K;采用Langmuir-Freundlich(LF)方程拟合吸附等温线,得到各气体的方程参数,进而采用LRC关联式预测多组分吸附平衡数据,并计算活性炭对模拟天然气的存储能力。结果表明:活性炭对3种气体的吸附等温线都属于I型等温线,采用L-F方程可以很好地描述各气体的吸附等温线;高比表面积活性炭对模拟天然气的存储量随吸附温度的升高而显著降低,在吸附存储压力为3.5 MPa,吸附温度从283 K上升到313 K,相应的存储量(体积比)由139降低为103;与纯甲烷的吸附存储相比,模拟天然气的吸附储量(体积比)提高约20。Small amounts of hydrocarbons,such as ethane and propane contained in natural gas,can affect the adsorption storage capacity. The adsorption isotherms of methane,ethane and propane on high surface area activated carbon were measured using a volumetric method at 283,293,303,313 K. The Langmuir-Freundlich（ LF） equation was applied to fit the isotherms. Then LRC equation was employed to predict the multi-component adsorption equilibrium data with the parameters obtained from L-F equation,and the storage capacity of simulated natural gas on activated carbon was calculated simultaneously. All the adsorption isotherms of methane,ethane and propane were I-type adsorption isotherms and agreed well with L-F equation. It shows that adsorption temperature has a great influence on the adsorption storage capacity of simulated natural gas. As the adsorption temperature increases from 283 K to 313 K,the storage capacity decreases from 139 to 103（ volume ratio） at 3. 5 MPa. The storage capacity of simulated natural gas is improved approximately by 20（ volume ratio） compared with that of pure methane under the same conditions.

关 键 词：天然气 吸附存储 高比表面积活性炭 等温线 多组分吸附 

分 类 号：TQ424.1[化学工程]