Combustion characteristics of thermal dissolution coal
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摘要: 低階煤的高值化利用對拓寬能源途徑,提高能源效率和解決環境問題具有重要意義.以N-甲基吡咯烷酮為有機溶劑,對4種低階煤進行熱萃取,獲得低灰分、高揮發分的熱溶煤產物.通過熱重分析研究了熱溶煤的燃燒特性,并利用拉曼光譜分析,對比了原煤與熱溶煤碳結構的變化規律.結果表明:與原煤相比,熱溶煤的灰分含量明顯降低,揮發分含量增高,固定碳含量減少,熱值增大.其中KL、GD和ZS 3種熱溶煤的H/C原子比大于原煤,XB的熱溶煤小于原煤.KL、GD和ZS 3種熱溶煤的峰強度(ID/IG)和峰面積(AD/AG)的比值大于相應的原煤,其有序化程度減小,結構缺陷增多,相應的其熱溶煤的燃燒反應性增大.而XB熱溶煤的ID/IG和AD/AG的值小于相應的原煤,有序化程度增大,燃燒反應性降低.Abstract: Coal is one of the most important energy sources in our society. However, there have been increasing environment concerns regarding coal utilization. The high-value application of low-rank coal has an important significance for broadening the energy pathways, improving energy efficiency, and solving environmental problems. In this study, thermal dissolution coals (TDCs), which have low ash and high volatility, were extracted from four types of low-rank coal by N-2-methyl-2-pyrrolidinone (NMP). The combustion characteristics of TDCs were investigated by thermogravimetric analysis, and the structure variation law of raw coals and TDCs were compared using Raman spectra. The results show that the ash content and fixed carbon of TDCs significantly decrease, whereas the volatile content and high heating valve increase. The H/C atomic ratios of KL, GD, and ZS TDCs are higher than those of raw coals, whereas XB has a lower H/C atomic ratio than that of raw coal. The ratio of peak intensity (ID/IG) and peak area (AD/AG) values of KL, GD, and ZS TDCs are greater than those of raw coals, indicating that as the ordering degrees of these TDCs decrease, the structure deficiencies and combustion reactivity increase. In contrast, XB coal showed opposite results.
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參考文獻
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