Heat–fluid–solid-coupled model of flue gas displacement CH 4 in coal seams and application

Heat–fluid–solid-coupled model of flue gas displacement CH 4 in coal seams and application | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Article Heat–fluid–solid-coupled model of flue gas displacement CH 4 in coal seams and application Gang bai, Xuepeng Wang, Jue Wang, Tianyu Xin, Zhengdong Liu, Jie Wei, and 2 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-4279650/v1 This work is licensed under a CC BY 4.0 License Status: Posted Version 1 posted You are reading this latest preprint version Abstract The objective of this study was to evaluate the effect of injecting flue gas (CO 2 , N 2 , and O 2 ) originating from coal-fired power plants into a coal seam on CH 4 extraction and CO 2 geological storage. To this end, a multifield thermal–fluid–solid-coupled mathematical model of flue gas injection extraction was established. The results showed that with the time increase, the volume concentration of CH 4 decreased, but the CO 2 , N 2 , and O 2 increased. Compare with single extraction the gas injection extraction brought about a significant reduction in the pressure and content of the CH 4 , an increase in the CH 4 extraction rate, and an increase in the effective radius of CH 4 extraction. In the single extraction, the temperature of the reservoir decreased, and its permeability increased. In the gas injection extraction, the temperature near the gas injection hole increased, whereas the temperature near the extraction hole decreased, and the permeability decreased overall. A method of measuring the effective radius of gas extraction by temperature is presented. The storage and extraction time of CO 2 exhibited a linear relationship, and the CO 2 escape rate increased gradually. The longer gas injection extraction the time, the greater the risk of coal and gas (CO 2 ) outbursts. Earth and environmental sciences/Environmental sciences/Environmental impact Physical sciences/Energy science and technology CH4 extraction power plant flue gas thermal–fluid–solid coupling modified permeability CO2 geological storage Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Posted Version 1 posted You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. 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Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-4279650","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Article","associatedPublications":[],"authors":[{"id":296958458,"identity":"7b7dd297-e7da-4014-a48e-8afd6d4ac493","order_by":0,"name":"Gang 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geological storage","lastPublishedDoi":"10.21203/rs.3.rs-4279650/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-4279650/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"\u003cp\u003eThe objective of this study was to evaluate the effect of injecting flue gas (CO\u003csub\u003e2\u003c/sub\u003e, N\u003csub\u003e2\u003c/sub\u003e, and O\u003csub\u003e2\u003c/sub\u003e) originating from coal-fired power plants into a coal seam on CH\u003csub\u003e4\u003c/sub\u003e extraction and CO\u003csub\u003e2\u003c/sub\u003e geological storage. To this end, a multifield thermal\u0026ndash;fluid\u0026ndash;solid-coupled mathematical model of flue gas injection extraction was established. The results showed that with the time increase, the volume concentration of CH\u003csub\u003e4\u003c/sub\u003e decreased, but the CO\u003csub\u003e2\u003c/sub\u003e, N\u003csub\u003e2\u003c/sub\u003e, and O\u003csub\u003e2\u003c/sub\u003e increased. Compare with single extraction the gas injection extraction brought about a significant reduction in the pressure and content of the CH\u003csub\u003e4\u003c/sub\u003e, an increase in the CH\u003csub\u003e4\u003c/sub\u003e extraction rate, and an increase in the effective radius of CH\u003csub\u003e4\u003c/sub\u003e extraction. In the single extraction, the temperature of the reservoir decreased, and its permeability increased. In the gas injection extraction, the temperature near the gas injection hole increased, whereas the temperature near the extraction hole decreased, and the permeability decreased overall. A method of measuring the effective radius of gas extraction by temperature is presented. The storage and extraction time of CO\u003csub\u003e2\u003c/sub\u003e exhibited a linear relationship, and the CO\u003csub\u003e2\u003c/sub\u003e escape rate increased gradually. 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