CO2-ECBM and CO2 Sequestration in Polish Coal Seam – Experimental Study

作者：Paweł Baran, Katarzyna Zarębska, Paweł Krzystolik, Jerzy Hadro, Andrew Nunn · 发表于：Journal of Sustainable Mining · 年份：2014 · DOI：10.7424/jsm140204 · 被引用次数：28 · 研究领域：Coal Properties and Utilization、Hydrocarbon exploration and reservoir analysis、Methane Hydrates and Related Phenomena

Methane recovery is interesting not only because of its clean combustion; it is also beneficial for the environment because of the reduction of the amount of methane emitted into the atmosphere, which is important because of methane’s significant impact on the greenhouse effect. However, desorption of methane is a slow process, significantly dependent on the coalification of coal, its porosity and petrographic composition. Injection of carbon dioxide into the coal bed under sufficient pressure might be a factor in stimulating the efficiency of this process, as – because of preferential sorption – carbon dioxide displaces methane molecules previously absorbed in the coal matrix. The measurements were made for Polish low-rank coal used for the analysis of methane recovery from Polish coal mines. Coal samples were collected from sites used for geological, sorption and petrographic research, as well as for the assessment of the reservoir’s genetic origin CH4 content. Experimental studies of sorption were performed with the use of the volumetric method at a lower and higher gas pressure. The methane isothermes show more than double the reduction of adsorption along with increasing temperature. The most significant changes of sorption capacity due to temperature variations can be seen when observing the difference in the course of the hysteresis of sorption/desorption of the gas as a function of temperature. In cases where there is a temperature of 323 K, a temperature hysteresis l...