Ren Li-Feng, Li Qing-Wei, Deng Jun, Yang Xiao, Ma Li, Wang Wei-Feng
Xi'an University of Science and Technology 58, Yanta Mid. Rd Xi'an Shaanxi 710054 PR China
Post-doctoral Research Center of Mining Engineering, Xi'an University of Science and Technology 58, Yanta Mid. Rd Xi'an Shaanxi 710054 PR China.
RSC Adv. 2019 Dec 12;9(70):41126-41134. doi: 10.1039/c9ra08875j. eCollection 2019 Dec 9.
A thermal analysis experiment was conducted in O/N/CO and O/N atmospheres (O concentrations were 21, 14, 8, and CO concentrations were 0, 39, 46, 52) to investigate the thermal behavior of coal oxidation and combustion. Results demonstrated that an elevated CO concentration or decreased O concentration had a delaying effect on the thermogravimetric analysis and differential scanning calorimetry (DSC) curves; moreover, the characteristic temperatures were substantially augmented. When the O concentration was 21 vol%, the total heat released by coals A (highly volatile bituminous coal) and B (anthracite coal) decreased by 5.8% and 4.1%, respectively, after CO addition. The comprehensive combustion performance index was also lowered. The DSC curve can be divided into two exothermic peaks, and the ratio of the peak 1 to peak 2 areas decreased with the addition of CO which indicated that CO inhibited the oxidation of the active functional groups of coal structures. Apparent activation energy in O/CO/N was less than that in O/N.
在O/N/CO和O/N气氛（O浓度为21、14、8，CO浓度为0、39、46、52）中进行了热分析实验，以研究煤氧化和燃烧的热行为。结果表明，CO浓度升高或O浓度降低对热重分析和差示扫描量热法（DSC）曲线有延迟作用；此外，特征温度显著提高。当O浓度为21体积%时，添加CO后，煤A（高挥发烟煤）和煤B（无烟煤）释放的总热量分别降低了5.8%和4.1%。综合燃烧性能指标也降低了。DSC曲线可分为两个放热峰，随着CO的添加，峰1与峰2面积之比降低，这表明CO抑制了煤结构中活性官能团的氧化。O/CO/N中的表观活化能小于O/N中的表观活化能。
