Preoptimal analysis of phase characteristic indicators in the entire process of coal spontaneous combustion |
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| Institution: | 1. School of Safety Science and Engineering, Xi''an University of Science and Technology, Xi''an, 710054, China;2. Shaanxi Industrial Process Safety and Emergency Rescue Engineering Technology Research Center, Xi''an University of Science and Technology, Xi''an, 710054, China;3. Shaanxi Key Laboratory of Coal Fire Disaster Prevention and Control, Xi''an University of Science and Technology, Xi''an, 710054, China;4. Department of Safety Health, And Environmental Engineering, National Yunlin University of Science and Technology, 123, University Rd., Sec 3, Douliou, Yunlin, 64002, Taiwan, ROC;1. Swiss Process Safety Consulting GmbH, Schönenbuchstrasse 36, CH-4123, Allschwil, Switzerland;2. Covestro Deutschland AG, Kaiser-Wilhelm-Allee 101–103, D-51373, Leverkusen, Germany;1. Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education, Tianjin University, Tianjin, 300350, China;2. CNOOC Energy Development Equipment Technology Co., Ltd., Tianjin, 300072, China;1. College of Chemistry and Chemical Engineering, China University of Petroleum (East China), Qingdao, 266580, China;2. Saifeite Engineering Group Co. Ltd., Qingdao, 266061, China;3. Department of Safety, Health, And Environmental Engineering, National Yunlin University of Science and Technology, Yunlin, 64002, Taiwan, ROC |
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| Abstract: | To accurately predict the development degree of coal spontaneous combustion (CSC), the CSC process was investigated using a programmed high-temperature-heating experimental system, and the variation law of index gas concentration in the holistic process of CSC and oxidation is formulated. Additionally, the accuracy of the experimental system was evaluated using experimental design for thermal analysis, and the correlation between gas index and apparent activation energy was determined using grey correlation analysis. The results indicated the following. In the critical temperature stage (0–100 °C), φ(CO)/φ(CO2) should serve as the main index and C2H4 should serve as the auxiliary index; in the crack-active-speedup temperature stage (100–260 °C), CO and φ(C2H4)/φ(C2H6) should serve as the main index and R1, the Graham index, and φ(C2H4)/φ(CH4) should serve as auxiliary indexes; in the speedup-ignition temperature stage (260–370 °C), R2 and the Graham index should serve as main indexes and φ(CO)/φ(CO2), C2H4, and R1 should serve as auxiliary indexes; in the ignition temperature (370–500 °C), R3 should serve as the main index and R2, the Graham index and C2H4 should serve as auxiliary indexes. Among them, the grey correlation degrees among the Graham index, Grignard fire coefficient, and apparent activation energy were the highest, reaching 0.91. |
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| Keywords: | Index gas concentration Thermal analysis Graham index Ignition temperature Grey correlation degrees Grignard fire coefficient |
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