Adsorption Characteristics of Coals Pyrolyzed at Slow Heating Rates

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• 作者：Robert L. KrummKeith W. Gneshin ; Milind Deo
• 刊名：Energy & Fuels
• 出版年：2017
• 出版时间：February 16, 2017
• 年：2017
• 卷：31
• 期：2
• 页码：1803-1810
• 全文大小：416K
• ISSN：1520-5029

文摘

Underground coal pyrolysis is a process similar to in situ oil shale production wherein heat is applied to deep coal formations to produce light hydrocarbons. Like enhanced coal bed methane, the injection of CO₂ post thermal treatment can improve hydrocarbon recovery and serves as a means of carbon sequestration. Little information exists pertaining to coals pyrolyzed to temperatures expected with this process. This work examines the development of meso- and micropores and their influence on methane and carbon dioxide adsorption and permeability on a thermally treated Utah bituminous coal. Residual tars were found to affect the pore size distributions in pyrolyzed coals. Generally, with increasing treatment temperature, there are more meso- and micropores. A correlation was established between the prevalence of mesopores in pyrolyzed coals and adsorption and, to a lesser extent, permeability. The treatment temperature of this particular coal is directly related to the amount of CO₂ said coal can store and how the plume of injected CO₂ moves through the formation.