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Comparative study on the flame retardancy of CO_(2) and N_(2) during coal adiabatic oxidation process

International Journal of Coal Science & Technology 2023年第4期10卷 254-264页

作者： Xiyang Fang Bo Tan Haiyan Wang School of Emergency Management and Safety Engineering China University of Mining and Technology(Beijing)Beijing 100083China School of Civil and Resources Engineering University of Science and TechnologyBeijing 100083China

To test the effectiveness of N_(2) and CO_(2) in preventing coal from spontaneously combusting,researchers used an adiabatic oxidation apparatus to conduct an experiment with different temperature starting ***-adsorbed helium(He)was used as a reference gas,and coal and oxygen concentration temperature variations were analyzed after *** results showed that He had the best cooling effect,N_(2) was second,and CO_(2) was the *** 70℃and 110℃,the impact of different gases on reducing oxygen concentration and the cooling effect was the ***,at the starting temperature of 150℃,CO_(2) was less effective in lowering oxygen concentration at the later stage than He and N_(2).N_(2) and CO_(2) can prolong the flame retardation time of inert gas and reduce oxygen displacement with an initial temperature *** the starting temperature is the same,N_(2) injection cools coal samples and replaces oxygen more effectively than CO_(2) *** flame retardancy of inert gas is the combined result of the cooling effect of inert gas and the replacement of *** findings are essential for using inert flame retardant technology in the goaf.

关键词： Coal spontaneous combustion adiabatic oxidation Inert gas flame retardant Flame retardant efficiency Replacement

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Changes in active functional groups during low-temperature oxidation of coal

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Mining Science and Technology 2010年第1期20卷 35-40页

作者： WANG Deming ZHONG Xiaoxing GU Junjie QI Xuyao School of Safety Engineering China University of Mining & Technology Xuzhou 221008 China State Key Laboratory of Coal Resources & Mine Safety China University of Mining & Technology Xuzhou 221008 China

Using Fourier Transform Infrared (FTIR) combined with an adiabatic oxidation test, temperature-programmed oxidation and gas analysis, we studied the changes of active functional groups during low-temperature oxidation of lignite, gas coal, fat coal and anthracite. During slow low-temperature heat accumulation, aliphatic hydrocarbons, such as methyl and methylene, are attacked by oxygen atoms absorbed by pores on coal surfaces, generating unstable solid intermediate carbon-oxygen complexes, which then decompose into gaseous products (CO, CO2) and stable solid complexes. At the accelerated oxidation stage, the stable complexes begin to decompose in large amounts and provided new active sites for further oxidation, while the aliphatic structures gained energy and fell from the benzene rings to produce CxHy and H2.

关键词： spontaneous combustion of coal FTIR adiabatic oxidation gaseous products

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