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采用拉曼光谱考察了澳大利亚烟煤在常压、温度为298~1 473 K条件下,不同热解气氛(Ar和N2)下的热解性能。结合AD/Aall、AG/Aall、WG以及PG-PD等表征参数分析发现,澳大利亚烟煤的热解可以分为三个阶段:298~873 K为固有小分子和大分子键能较弱处断裂分解产生的小分子化合物的析出沉积和挥发;873~1 273 K为大分子化合物裂解挥发和炭化;1 273~1 473 K为焦炭的石墨化。在N2和Ar气氛经1 473 K热处理后,焦炭的不同杂化结构的碳相对含量呈现明显差异。不同保温时间下,其煤焦碳结构演变趋势相似,但保温时间越长,越有利于小分子挥发分在较低温度的挥发。
Raman spectroscopy was used to investigate the pyrolytic performance of Australian bituminous coal under atmospheric pressure and temperature ranging from 298 to 1473 K in different pyrolytic atmospheres (Ar and N2). The analysis of the characterization parameters of AD / Aall, AG / Aall, WG and PG-PD found that the pyrolysis of Australian bituminous coal can be divided into three stages: 298 ~ 873 K is the rupture decomposition of the weak small molecule and macromolecule bond Resulting in the deposition and volatilization of small molecule compounds; 873 ~ 1 273 K for the cracking and volatilization of macromolecular compounds and carbonization; 1 273 ~ 1 473 K for the graphitization of coke. After N2 and Ar atmosphere heat treatment at 1 473 K, the carbon content in different hybrid structures of coke showed obvious difference. Under the different holding time, the evolution of coal coke structure is similar, but the longer the holding time, the more conducive to the volatilization of small molecules at lower temperatures.