不同升温速率对水浸煤二次氧化过程中CO与CO2生成特性的影响OA

This paper aims to investigate the effect of different heating rates on the generation behav-ior of indicator gases during the secondary oxidation of water-immersed coal.By taking the water-im-mersed coal samples as the research object,the study systematically examines the characteristics of O2 consumption and CO and CO2 production during the primary and secondary oxidation processes by tem-perature-programmed oxidation experiments at different heating rates,and,analyzes by stages the appar-ent activation energies of CO and CO2 generation.The results show that compared with the primary oxida-tion,the oxygen consumption rate of the coal samples is reduced during secondary oxidation,whereas the production rates of CO and CO2 become more pronounced in the medium-and high-temperature ranges.In addition,secondary oxidation generally reduces the apparent activation energy for CO2 generation.Nota-bly,under a heating rate of 0.5℃/min,the apparent activation energy for CO2 generation in the 40-110℃range is higher than that observed at other heating rates.These findings reveal the coupled effects of heating rate and oxidation number on the secondary oxidation of water-immersed coal,and provide a theoretical basis for a deeper understanding of the spontaneous combustion mechanism of re-oxidized coal.