煤矿安全2024，Vol.55Issue(4)：26-32,7.DOI:10.13347/j.cnki.mkaq.20230502
封闭空间煤心固碳过程CO2吸附-运移特征
Properties of CO2 adsorption and migration during carbon sequestration in confined spaces
摘要
Abstract
During the process of injecting CO2 into coal reservoirs,the diffusion and adsorption of CO2 are slow process,and the ad-sorption and migration time characteristics under different injection pressures have a significant impact on the design of coal seam CO2 storage.Therefore,dual energy X-ray CT scanning was used to calculate and analyze the changes of coal core density and CO2 concentration before and after gas injection in coal reservoirs under confining pressure.The results show that in different regions of coal core,gas migrates at different speed conditions,and diffusion and adsorption progress are slow.The average CO2 concentration in the coal core increases with the increase of time and CO2 injection pressure,and the CO2 concentration almost monotonically de-creases along the axial direction of coal core from gas injection end to outlet section.The distribution of CO2 concentration in coal core is uneven.The lower the CO2 concentration in areas with high core density(mineral influence)is,the higher the CO2 concentra-tion in areas with low coal matrix density is.关键词
CO2吸附/煤储层/CO2封存/CO2运移/注气压力/围压/CT扫描Key words
CO2 adsorption/coal reservoirs/CO2 storage/CO2 migration/gas injection pressure/confining pressure/CT scan分类
矿业与冶金引用本文复制引用
司小昆..封闭空间煤心固碳过程CO2吸附-运移特征[J].煤矿安全,2024,55(4):26-32,7.基金项目
金属矿山高效开采与安全教育部重点实验室开放基金资助项目(201904) （201904）
