低阶煤着火前热行为的分段情景式研究

    Stage scenario study on thermal behavior of low rank coal before ignition

    • 摘要: 低阶煤的成分非常复杂,不同低阶煤成分差别很大,从而导致其着火倾向的差异。为深入探索低阶煤的着火倾向,从宏观微观相结合的角度,系统地对BRXL和YJL 2种低阶煤的热行为进行了分段研究。其中,初次和二次分段结果能够推断出影响着火的关键阶段,在此阶段,2种煤均发生了集中的反应和放热,但BRXL的蓄热过程早于YJL发生;此外,2种煤的反应气体释放过程均出现了异常。结合孔径演化特征,可发现BRXL和YJL分别被微孔(<2 nm)和2~10 nm的介孔所影响,而BRXL由于其原始孔径分布均匀,保证了其反应平稳发生,气体释放顺利进行,因此反应热迅速积累,导致BRXL表现出比YJL更强的着火倾向。

       

      Abstract: Low-rank coal is very complex in composition and differs in the proximate analysis, which significantly affects the ignition. In order to further explore the ignition tendency of low rank coal, the thermal behavior of BRXL and YJL low rank coal is systematically studied in stages from the perspective of macro and micro combination. Among them, the primary and secondary stage results can infer the key stage affecting the ignition. In this stage, the two kinds of coal have concentrated reaction and exothermic heat, but the heat storage process of BRXL is earlier than that of YJL. In addition, the reaction gas release process of the two kinds of coal appeared abnormal. Combined with the pore size evolution characteristics, it can be found that BRXL and YJL are affected by micropores(<2 nm) and 2-10 nm mesoporous, respectively. Because of the uniform distribution of the original pore size, BRXL ensures the smooth reaction and smooth gas release, so the rapid accumulation of reaction heat leads to BRXL showing a stronger ignition tendency than YJL.

       

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