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Char porosity characterisation by scanning electron microscopy and image analysis

机译：通过扫描电子显微镜和图像分析表征炭孔隙率

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摘要

No significant change in either the morphotype composition or the macroporosity (pores > 5 μm) in the 0--30 wt./100 char burnout interval were revealed by reflected light microscopy or image analysis. Two high temperature char series from a Tertiary South American coal (Cl) and a Permian Gondwana coal (C_2) were therefore examined by scanning electron microscopy to provide information on the combustion process up to ～60 wt./100 char burnout. This study documents a significant mesopore (～0.l --5 μm) development on the fused chars in the burnout interval studied. A method to quantify the size and amount of the mesopores is described and both the parameters increased with increasing char burnout. Above a char burnout of ～30 wt./100 an increase in macroporosity was detected and ascribed to coalescence of mesopores to form larger pores. Although the measurement of mesoporosity is restricted to fused chars, i.e. pores in fragments and the char morphotypes inertoid, fusinoid and solid could not be measured, the consideration of mesoporosity seems to be fundamental in under- standing, evaluating and modelling combustion processes in the char burnout interval studied.
机译：通过反射光显微镜或图像分析，在0--30 wt./100焦炭烧尽时间间隔内，形态型组成或大孔率（孔径> 5μm）均无显着变化。因此，通过扫描电子显微镜检查了两个来自南美高等煤（Cl）和二叠纪冈瓦纳煤（C_2）的高温煤焦系列，以提供有关高达60 wt./100炭烧尽的燃烧过程的信息。这项研究表明，在研究的燃尽时间段内，熔融炭具有显着的中孔（〜0.1 -5μm）发展。描述了量化中孔大小和数量的方法，并且两个参数都随着炭烧尽而增加。炭烧尽至约30 wt./100以上时，检测到大孔率增加，这归因于中孔的聚结形成更大的孔。尽管介孔率的测量仅限于熔化的炭，即碎片中的孔，并且无法测量炭形态，惰性，fusinoid和固体，但在理解，评估和建模炭的燃烧过程中，介孔率的考虑似乎是基础研究了倦怠间隔。

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