吉首大学学报（自然科学版）

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椰壳活性炭低温变压吸附天然气中CO2/CH4实验

刘学武，杜宝国，武锦涛，王晓娟，邹久朋   

  1. （1.大连理工大学化工机械与安全学院，辽宁 大连 116023；2.大连理工大学能源与动力学院，辽宁 大连 116023）
  • 出版日期:2016-03-25 发布日期:2016-05-11
  • 作者简介:刘学武（1974—），男，黑龙江牡丹江人，大连理工大学化工机械学院副教授，博士，主要从事天然气净化及超临界流体技术研究.
  • 基金资助:

    中央高校基本科研业务费专项资金资助（DUT15ZD109）；中国石油科技创新基金项目资助(2015D-5006-0601)；大连市科技计划项目（2015A11GX045）

Experiment of Pressure Swing Adsorption of  CO2/CH4 at Low Temperature Through Coconut Shell Activated Carbon

LIU Xuewu,DU Baoguo,WU Jintao,WANG Xiaojuan,ZOU Jiupeng   

  1. (1.School of Chemical Machinery and Safety,Dalian University of Technology,Dalian 116023,Liaoning China;2.School of Energy and Power Engineering,Dalian University of Technology,Dalian 116023,Liaoning China)
  • Online:2016-03-25 Published:2016-05-11

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摘要：

结合天然气液化储运过程中低温与常规变压吸附（PSA）工艺，提出低温变压吸附净化天然气工艺.用椰壳活性炭对CO2和CH4单组份气体进行静态吸附，以及CO2/CH4二元混合气体动态模拟吸附分离.利用静态体积法研究-30~25 ℃，1.2~2.5 MPa下CO2和0~4 MPa下CH4在椰壳活性炭上的吸附行为，椰壳活性炭对两者的吸附量均随温度降低而增大.动态吸附分离实验压力为0.45，0.85，1.85 MPa，随温度或压力的降低，椰壳活性炭对CO2/CH4二元混合气体的分离因子不断增大，温度对其影响效果大于压力的影响，且在实验温度范围内CH4的动态吸附量呈先增大后减小的变化趋势.研究表明，椰壳活性炭对天然气脱碳具有广阔的应用前景.

关键词： 天然气, 椰壳活性炭, 吸附量, 分离因子

Abstract:

The natural gas purification technology through pressure swing adsorption (PSA) at low temperature was proposed based on the low temperature processing and the conventional PSA technology applied in liquefied natural gas storage and transport.Coconut shell activated carbon was used for the static adsorption of CO2 and CH4 component gas and the dynamic simulation of adsorption separation of binary mixed CO2/CH4  gas.At  -30~25 ℃,the static volumetric method was used to investigate adsorption behavior of CO2 under the pressure from 1.2~2.5 MPa and that of CH4 under the pressure from 0~4 MPa,respectively.The results showed that the adsorption capacity of coconut shell activated carbon for both CO2 and CH4 increased with the decrease of temperature.Under the pressure of 0.45 MPa,0.85 MPa and 1.85 MPa for the dynamic tests,it was found that the separation factor will continue to increase with the decreases of temperature or pressure for binary mixed CO2/CH4 gas;besides,it was found the effect of temperature is greater than the impact of pressure;furthermore,the dynamic adsorption capacity of CH4 increases at first and then decreases within the range of experiment temperature.The research shows that coconut shell activated carbon for natural gas decarburization has broad application prospects.

Key words: natural gas, coconut shell activated carbon, adsorption capacity, separation factor

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