分离富集低浓度煤层气CH_(4)技术的研究进展

Research Progress on Separation and Enrichment of Low Concentration Coalbed Methane CH_(4) Technology

低浓度煤层气作为一种非常规天然气资源,无论是脱氧再分离技术还是直接分离技术都需要解决CH_(4)/N_(2)的分离难题。主要从两个方面进行综述:介绍了低浓度煤层气中催化燃烧脱氧法、焦炭燃烧脱氧法、硫化钠脱氧法和膜分离脱氧法并讨论了其脱氧机理及发展前景;着重讨论了作为低浓度煤层气变压吸附分离技术中所需的商用活性炭、生物质活性炭、聚合物制碳基材料3类吸附剂,并对其的吸附与分离CH_(4)机理进行了详细的总结与分析,提出了分离富集低浓度煤层气CH_(4)选择性提升的方法,最后展望了低浓度煤层气脱氧及分离富集甲烷的应用前景和发展趋势。

As a unconventional natural gas resource,low concentration coalbed methane needs to solve the separation problem of CH_(4)/N_(2),whether it is deoxygenation and re separation technology or direct separation technology.This article mainly reviews from two aspects:introducing the catalytic combustion deoxygenation method,coke combustion deoxygenation method,sodium sulfide deoxygenation method,and membrane separation deoxygenation method in low concentration coalbed methane,and discussing their deoxygenation mechanism and development prospects;Emphasis was placed on discussing three types of adsorbents,namely commercial activated carbon,biomass activated carbon,and polymer based carbon materials,required for the pressure swing adsorption and separation technology of low concentration coalbed methane.The adsorption and separation mechanisms of CH_(4) were summarized and analyzed in detail.A method was proposed to enhance the selectivity of CH_(4) in the separation and enrichment of low concentration coalbed methane.Finally,the application prospects and development trends of low concentration coalbed methane deoxygenation and separation and enrichment of methane were prospected.