Chemical Industry and Engineering Progree ›› 2015, Vol. 34 ›› Issue (09): 3452-3455,3486.DOI: 10.16085/j.issn.1000-6613.2015.09.038

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Biogas purification using carbon molecular sieves by pressure swing adsorption

WANG Juncheng, HU Mingzhen, SUN Linbing, LIU Xiaoqin   

  1. State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry and Chemical Engineering, Nanjing Tech. University, Nanjing 210009, Jiangsu, China
  • Received:2015-02-10 Revised:2015-03-09 Online:2015-09-05 Published:2015-09-05

碳分子筛变压吸附提纯沼气的性能

王骏成, 胡明振, 孙林兵, 刘晓勤   

  1. 南京工业大学化学化工学院, 材料化学工程国家重点实验室, 江苏 南京 210009
  • 通讯作者: 刘晓勤,教授,博士生导师,主要从事吸附剂的制备及应用的研究。E-mail:liuxq@njtech.edu.cn
  • 作者简介:王骏成(1990-),男,硕士研究生,主要从事气体吸附分离的研究。
  • 基金资助:

    国家重点基础研究计划项目(2013CB733504)。

Abstract: Carbon molecular sieves were selected to separate CH4/CO2 mixture by pressure swing adsorption. Adsorption isotherms of pure CH4,CO2 and N2 gases on carbon molecular sieves were measured by the intelligent gravimetric analyzer apparatus(IGA-100,HIDEN)at 25℃,and the gas diffusion rates on the adsorbents were in the order of CO2>N2>CH4. The breakthrough curves were measured by single fixed bed device. Pressures,flow rates and trace nitrogen(2%)were discussed to investigate separation performances,and adsorption mechanisms were also discussed. The results indicated that adsorption capacity of CO2 and CH4 on carbon molecular sieves were 35.9mL/g and 5.4mL/g respectively at pressure of 0.4MPa and flow rate of 200mL/min. The separation coefficient of CO2/CH4 reached 12.6,indicating that pure CH4 could be collected from the fixed bed device,and the carbon molecular sieves could be well regenerated by vacuum desorption. These results suggested that carbon molecular sieves might be suitable for CO2 removal from biogas. The diffusion rate of N2 was faster than that of CH4 on carbon molecular sieves; therefore it is possible to enrich CH4 with high concentration through the fixed bed device.

Key words: biogas purification, pressure swing adsorption, decarbonization, carbon molecular sieve, methane

摘要: 选择碳分子筛,以CH4和CO2为原料气,对变压吸附法提纯沼气中生物甲烷的分离性能进行了研究。采用高精度智能重量分析仪IGA-100测定了25℃下CH4、CO2和N2纯组分气体在碳分子筛上的吸附平衡等温线,计算了3种气体在碳分子筛内的扩散速率CO2>N2>CH4。使用单塔变压吸附装置测量了动态吸附穿透曲线,考察了吸附压力、气体流量和少量氮气等因素对吸附分离的影响,并对吸附机理做了初步探讨。实验结果表明,在吸附压力为0.4MPa、气体流量为200mL/min时,在碳分子筛上CO2穿透吸附量为35.9mL/g,CH4穿透吸附量为5.4mL/g,CO2/CH4分离系数高达12.6,可直接从吸附塔顶富集纯净的CH4,而且碳分子筛可以通过抽真空完全再生,是一种理想的吸附材料;在有少量氮气存在的实验条件下,由于碳分子筛对CH4和N2具有动力学分离效应,仍能在塔顶富集高浓度的CH4

关键词: 沼气提纯, 变压吸附, 脱碳, 碳分子筛, 甲烷

CLC Number: 

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