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Research on the feasibility of storage and estimation model of storage capacity of CO_(2)in fissures of coal mine old goaf

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International Journal of Mining Science and Technology 2023年第6期33卷 675-686页

作者： Yang Ding Shugang Li Bing Zhu Haifei Lin Jingfei Zhang Junhong Tan Wenbin Chen School of Safety Science and Engineering Xi’an University of Science and TechnologyXi’an 710054China Western Coal Gas Intelligent Draining Engineering Research Center China National Coal AssociationXi’an 710054China

The concept of the carbon cycle in the old goaf of a coal mine based on CO_(2)utilization and storage was put forward adhering to the principle of low-carbon development,utilization of space resources in old goafs,and associated gas resources ***,the evolution characteristics of overburden fissures in the goaf of the case was studied using a two-dimensional physical similarity simulation test,the sealing performance of the caprocks after stabilization was analyzed,and the fissures were counted and ***,the process of gaseous CO_(2)injection in the connected fissure was simulated by Ansys Fluent software,and the migration law and distribution characteristics of CO_(2)under the condition of gaseous CO_(2)injection were ***,the estimation models of free CO_(2)storage capacity in the old goaf were constructed considering the proportion of connected fissure and the effectiveness of CO_(2)*** CO_(2)storage capacity in the old goaf of the case coal mine was *** results showed that a caprock group of“hard-thickness low-permeability hard-thickness”was formed after the caprock-fissures system in the goaf of the case tended to be stable *** connected fissure,occlude cracks,and micro-fractures in the goaf accounted for 85.5%,8.5%,and 6%of the total fissures,*** CO_(2)first migrated to the bottom of the connected fissure after CO_(2)was injected into the goaf,then spread horizontally along the bottom of the connected fissure after reaching the bottom,and finally spread longitudinally after filling the bottom of the entire connected *** theoretical and effective storage capacities of free CO_(2)at normal temperature and pressure in the old goaf of the case were 9757 and 7477 t,*** effective storage capacity of free CO_(2)at normal temperature and pressure in the old goaf after all minefield mined was 193404 *** research can provide some reference for the coal mining ind

关键词： Carbon cycle old goaf Fissure CO_(2)storage Feasibility Storage capacity

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