亚烟煤低温氧化元素迁移规律及原位红外实验
发布时间：2019-02-09 18:55
【摘要】：基于动力学与热力学理论,研究了煤升温过程中C,H,O,N,S五种基本元素的迁移转化规律,同时根据红外实验分析了煤中主要官能团变化趋势。结果表明,煤样在物理吸附和化学吸附阶段,碳氧化合物变化占主导地位,在化学反应阶段,碳氢化合物和含氮化合物变化频率超过碳氧化物。低温氧化过程中,H元素的表观活化能最小,N元素表观活化能最大,而O,S元素的表观活化能为负值,C,H,N元素迁移过程为吸热反应,O,S元素转化过程是放热反应。煤中脂肪族C—H在煤温上升的过程含量逐渐降低。煤中COOH含量与总体的C=O含量变化趋势一致,当温度超过120℃以后,两者含量逐渐增加,此外对煤低温氧化过程涉及到的化学反应步骤也进行了研究推导。
[Abstract]:The migration and transformation of C, H, O, N and S in the coal-heating process are studied based on the theory of dynamics and thermodynamics, and the variation trend of the main functional groups in the coal is analyzed according to the infrared experiment. The results show that the change of the carbon-oxygen compound is dominant in the physical adsorption and chemisorption stage, and the frequency of the change of the hydrocarbon and the nitrogen-containing compound in the chemical reaction is higher than that of the carbon oxide. In the process of low temperature oxidation, the apparent activation energy of the H element is the least, the apparent activation energy of the N element is the largest, and the apparent activation energy of the O and S elements is negative, and the migration process of the C, H and N elements is endothermic reaction, and the conversion process of the O and S elements is an exothermic reaction. The content of C-H in the coal is gradually reduced in the coal temperature. The content of COOH in the coal is consistent with the general change trend of C = O, and when the temperature exceeds 120 鈩，
本文编号：2419289
[Abstract]:The migration and transformation of C, H, O, N and S in the coal-heating process are studied based on the theory of dynamics and thermodynamics, and the variation trend of the main functional groups in the coal is analyzed according to the infrared experiment. The results show that the change of the carbon-oxygen compound is dominant in the physical adsorption and chemisorption stage, and the frequency of the change of the hydrocarbon and the nitrogen-containing compound in the chemical reaction is higher than that of the carbon oxide. In the process of low temperature oxidation, the apparent activation energy of the H element is the least, the apparent activation energy of the N element is the largest, and the apparent activation energy of the O and S elements is negative, and the migration process of the C, H and N elements is endothermic reaction, and the conversion process of the O and S elements is an exothermic reaction. The content of C-H in the coal is gradually reduced in the coal temperature. The content of COOH in the coal is consistent with the general change trend of C = O, and when the temperature exceeds 120 鈩，
本文编号：2419289
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