The effect of N2/CO2 blend ratios on the pyrolysis and combustion behaviors of coal particles: Kinetic and thermodynamic analyses |
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| Institution: | 1. State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou, Jiangsu 221116, People''s Republic of China;2. School of Safety Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, People''s Republic of China;1. College of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo, 454003, Henan, PR China;2. State Collaborative Innovation Center of Coal Work Safety and Clean-efficiency Utilization, Jiaozuo, 454003, Henan, PR China;3. State Key Laboratory Cultivation Base for Gas Geology and Gas Control, Jiaozuo, 454003, Henan, PR China;1. Hunan University of Science and Technology, School of Resource, Environment and Safety Engineering, Xiangtan, Hunan, 411201, China;2. Central South University, School of Resources and Safety Engineering, Changsha, Hunan, 410083, China;1. Jiangsu Key Laboratory of Fire Safety in Urban Underground Space, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China;2. State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Jiangsu 221116, China;3. Key Laboratory of Gas and Fire Control for Coal Mines, China University of Mining and Technology, Ministry of Education, Xuzhou, Jiangsu 221116, China;4. China Academy of Safety Science and Technology, Beijing 100012, China;1. Dipartimento di Ingegneria Industriale, Università degli Studi di Padova, Via Marzolo 9, 35131, Padova, Italy;2. Dipartimento di Ingegneria Civile, Chimica, Ambientale e dei Materiali, Università degli studi di Bologna, Via Terracini 28, 40131, Bologna, Italy;3. Corpo Nazionale dei Vigili del Fuoco Comando Venezia, Via Motorizzazione 7, 37100, Venezia, Italy;4. Dipartimento di Ingegneria Civile, Edile e Ambientale, Via Marzolo 9, 35131, Padova, Italy |
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| Abstract: | The aim of this work is to investigate the impact of various CO2/N2 ratios on coal pyrolysis and combustion properties and to provide theoretical guidance for better preventing and controlling coal spontaneous combustion in the goaf. The dynamic pyrolysis and combustion characteristics of DX coal were analyzed by using a thermal gravimetric analyzer (TGA) in a constant oxygen atmosphere with different CO2/N2 blend ratios. The Málek method combining Coats-Redfern and Achar methods was used to determine the most probable mechanism functions. CO2 containing atmospheres increased characteristic temperatures, burnout rate, maximum mass loss rate and comprehensive combustion performance index compared to O2/N2 atmospheres. In stages I-III, a lower apparent activation energy was observed in O2/CO2 atmospheres. Apparent activation energy and enthalpy changes showed upward trends in the reaction stage (I→III→IV), whereas Gibbs free energy change and entropy change decreased. The dynamic pyrolysis and combustion of DX coal necessitated increased energy in environment with a CO2/N2 ratio of 4:6, revealing the optimal inhibitory effect on DX coal with this particular ratio. |
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| Keywords: | Multicomponent gas Reaction mechanism function Kinetic parameters Thermodynamic parameters |
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