{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,1]],"date-time":"2026-09-01T04:41:15Z","timestamp":1788237675237,"version":"build-2803163510"},"reference-count":64,"publisher":"MDPI AG","issue":"7","license":[{"start":{"date-parts":[[2026,3,26]],"date-time":"2026-03-26T00:00:00Z","timestamp":1774483200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"China Power Engineering Consulting Group Co., Ltd.","award":["DG3-J04-2024"],"award-info":[{"award-number":["DG3-J04-2024"]}]},{"award":["DG3-J04-2024"],"award-info":[{"award-number":["DG3-J04-2024"]}],"id":[{"id":"https:\/\/ror.org\/04t59qd02","id-type":"ROR","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Materials"],"abstract":"<jats:p>Oxy-fuel combustion is a near-zero emission technology that utilizes high-concentration O2 in place of air, combined with recycled flue gas, to achieve efficient combustion and enable effective CO2 capture. In this study, air (21% O2\/79% N2) was used as the control atmosphere, and rice straw combustion experiments were conducted using thermogravimetric analysis and differential scanning calorimetry and differential scanning calorimetry coupled with mass spectrometry (TG-MS) at heating rates of 10, 20, and 30 \u00b0C\/min under oxy-fuel conditions of 30% O2\/70% CO2, 50% O2\/50% CO2, and 70% O2\/30%CO2. The combustion behavior, pollutant emissions, reaction kinetics, and underlying mechanisms were systematically evaluated. The results show that CO2 in oxy-fuel atmospheres exhibits a higher thermal inertia, due to its greater density and specific heat capacity, thereby enhancing flame stability. Oxy-fuel atmospheres reduce the ignition temperature (T\u1d62) and burnout temperature (Tf), shorten the combustion duration, shift DTG and DSC peaks to lower temperatures, and result in sharper peaks along with an increased ignition index (C\u1d62), burnout index (Cb), and comprehensive combustion index (S). Mass spectrometry (MS) analysis reveals that oxy-fuel atmospheres combined with heating rates of 20\u201330 \u00b0C\/min suppress O2 diffusion and thermal NO formation, reducing NOx emissions by over 75% and simultaneously inhibiting the release of SO2 and COS. Kinetic analysis using the FWO and Friedman methods shows that the activation energy decreases from 210.5 kJ\/mol and 219.1 kJ\/mol under air conditions to 110.5 kJ\/mol and 114.6 kJ\/mol in oxy-fuel atmospheres, representing a reduction in reaction barriers of 47.5% and 47.7%, respectively. The reaction mechanisms were identified as three-dimensional diffusion-controlled processes at heating rates of 20\u201330 \u00b0C\/min, and random nucleation followed by growth under high O2 concentration conditions at a heating rate of 30 \u00b0C\/min. Optimizing the combustion atmosphere and heating rate enhances the rice straw combustion efficiency and reduces pollutant emissions, thereby providing theoretical support for its clean and efficient utilization.<\/jats:p>","DOI":"10.3390\/ma19071321","type":"journal-article","created":{"date-parts":[[2026,3,26]],"date-time":"2026-03-26T15:10:24Z","timestamp":1774537824000},"page":"1321","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Combustion Kinetics and Reaction Mechanisms of Rice Straw During Oxy-Fuel Combustion"],"prefix":"10.3390","volume":"19","author":[{"given":"Dandan","family":"Li","sequence":"first","affiliation":[{"name":"Engineering Research Centre of Oil Shale Comprehensive Utilization, Ministry of Education, Northeast Electric Power University, Jilin 132012, China"},{"name":"Northeast Electric Power Design Institute Co., Ltd., China Power Engineering Consulting Group, Changchun 130021, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qing","family":"Wang","sequence":"additional","affiliation":[{"name":"Engineering Research Centre of Oil Shale Comprehensive Utilization, Ministry of Education, Northeast Electric Power University, Jilin 132012, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yufeng","family":"Pei","sequence":"additional","affiliation":[{"name":"Northeast Electric Power Design Institute Co., Ltd., China Power Engineering Consulting Group, Changchun 130021, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiuyan","family":"Zhang","sequence":"additional","affiliation":[{"name":"Northeast Electric Power Design Institute Co., Ltd., China Power Engineering Consulting Group, Changchun 130021, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chang","family":"Yu","sequence":"additional","affiliation":[{"name":"Engineering Research Centre of Oil Shale Comprehensive Utilization, Ministry of Education, Northeast Electric Power University, Jilin 132012, China"},{"name":"Northeast Electric Power Design Institute Co., Ltd., China Power Engineering Consulting Group, Changchun 130021, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hongpeng","family":"Zhao","sequence":"additional","affiliation":[{"name":"Northeast Electric Power Design Institute Co., Ltd., China Power Engineering Consulting Group, Changchun 130021, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Da","family":"Cui","sequence":"additional","affiliation":[{"name":"Engineering Research Centre of Oil Shale Comprehensive Utilization, Ministry of Education, Northeast Electric Power University, Jilin 132012, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yan","family":"Pan","sequence":"additional","affiliation":[{"name":"Engineering Research Centre of Oil Shale Comprehensive Utilization, Ministry of Education, Northeast Electric Power University, Jilin 132012, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuqi","family":"Wang","sequence":"additional","affiliation":[{"name":"School of Science, Northeast Electric Power University, Jilin 132012, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,3,26]]},"reference":[{"key":"ref_1","unstructured":"Abraham, B.M., Asbury, J.G., Lynch, E.P., and Teotia, A.P. 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