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Quantitative study on the influence of the difference of the molecular structure on the spontaneous combustion characteristics of the coal metamorphism process
Aip Advances ( IF 1.6 ) Pub Date : 2021-04-12 , DOI: 10.1063/5.0046075
Fengwei Dai 1 , Huiwen Zhang 1
Affiliation  

Neimeng lignite, Huajin bituminous coal, Sitai bituminous coal, and Changcun lean coal with different degrees of metamorphism were analyzed via infrared spectrum curve fitting analysis and thermal analysis experiments, and the influence of the change in the active functional groups in the coal structure on the coal spontaneous combustion characteristics was explored. After the spectral curve was fitted, it could be divided into four areas—hydroxyl, C–H stretch band, oxygen-containing functional group, and aromatic structure—and then, the molecular structure content of different functional groups was quantitatively calculated. In the thermal analysis experiment, the characteristic value and the combustion activation energy of the coal were obtained through the thermogravimetric analysis curve, and the calorific value of the coal could be calculated using the differential scanning calorimetry curve. After combining the two experiments to obtain a linear relationship, the results showed that as the degree of coal metamorphism deepened, the activation energy of the coal combustion gradually increased, and the amount of heat released decreased. For the self-associated hydroxyl group in the hydroxyl group, the methylene group in the aliphatic hydrocarbon, the C=C double bond in the oxygen-containing functional group, and the three-substituted aromatic ring in the aromatic structure, the content of these functional groups is the highest for coal, with increases of 11.01%, 31.81%, 14.34%, and 22.9%, respectively, and the effect of inhibiting the spontaneous combustion of coal is more significant.

中文翻译:

分子结构差异对煤变质过程自燃特性影响的定量研究

通过红外光谱曲线拟合分析和热分析实验,分析了不同变质程度的内蒙褐煤,华锦烟煤,四台烟煤和长村贫煤,以及煤中活性官能团的变化对煤质的影响。探索了煤的自燃特性。拟合光谱曲线后,可将其分为四个区域:羟基,CH伸缩带,含氧官能团和芳族结构,然后定量计算不同官能团的分子结构含量。在热分析实验中,通过热重分析曲线获得了煤的特征值和燃烧活化能,利用差示扫描量热曲线可以计算出煤的热值。结合两个实验得出线性关系后,结果表明,随着煤变质程度的加深,煤燃烧的活化能逐渐增加,放出的热量减少。对于羟基中的自缔合羟基,脂族烃中的亚甲基,含氧官能团中的C = C双键以及芳族结构中的三取代芳环,这些的含量煤中官能团最高,分别增加了11.01%,31.81%,14.34%和22.9%,抑制煤自燃的效果更为显着。
更新日期:2021-04-30
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