Carbon Dioxide Sorption Capacities of Coal Gasification Residues

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• 作者：Thomas Kempka ; Tom谩s Fern谩ndez-Steeger ; Dong-Yong Li ; Marc Schulten ; Ralph Schl眉ter ; Bernhard M. Krooss
• 刊名：Environmental Science & Technology
• 出版年：2011
• 出版时间：February 15, 2011
• 年：2011
• 卷：45
• 期：4
• 页码：1719-1723
• 全文大小：775K
• 年卷期：v.45,no.4(February 15, 2011)
• ISSN：1520-5851

文摘

Underground coal gasification is currently being considered as an economically and environmentally sustainable option for development and utilization of coal deposits not mineable by conventional methods. This emerging technology in combination with carbon capture and sorptive CO₂ storage on the residual coke as well as free-gas CO₂ storage in the cavities generated in the coal seams after gasification could provide a relevant contribution to the development of Clean Coal Technologies. Three hard coals of different rank from German mining districts were gasified in a laboratory-scale reactor (200 g of coal at 800 掳C subjected to 10 L/min air for 200 min). High-pressure CO₂ excess sorption isotherms determined before and after gasification revealed an increase of sorption capacity by up to 42%. Thus, physical sorption represents a feasible option for CO₂ storage in underground gasification cavities.