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The correlation between coal char structure and reactivity at rapid heating condition in TGA and heating stage microscope

机译：TGA和加热台显微镜快速加热条件下煤焦结构与反应性的相关性

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The coal pyrolysis and char gasification process have been widely studied in TGA at a low heating rate, which is far lower than the heating rate when coal particle enters into the boiler and gasifier. In this work, the isothermal CO(2)( )gasification reactivity of in-situ coal chars was performed in rapid heating TGA and a heating stage microscope. The char structure parameters determined by XRD and Raman were combined to describe the char reactivity at the same temperature. Results showed that maximum weight loss rate (DTG (max)) of raw coal evidently increased and the corresponding maximum rate temperature raised with the increasing of heating rate during pyrolysis. Nonetheless, the heating rate had slightly effect on gasification reactivity of in-situ char samples when it exceeded 50 K/min. Considering the physical meaning and universality of the coal char structure and gasification reactivity fitting, the XRD and Raman structural parameters were combined to describe the gasification reactivity. The new method for coal char reactivity under rapid heating rate is established, Rs = 0.174 + 43.14d(0)(02,a)/L-c,L-a + 3.58I(D3) X I-D4/I-G(2). Furthermore, a visually heating stage microscope was also applied for determining the in-situ char reactivity through image analyzing. The gasification process of in-situ coal char particles fits the shrinking particle pattern at the original and midterm stages. However, the shrinking particle pattern changed into the shrinking core pattern at high carbon conversion. Moreover, the CO inhibition effect and inter-particle interaction account for the difference of gasification reactivity by rapid heating TGA and heating stage microscope.
机译：在TGA中以较低的加热速率对煤的热解和焦化气化过程进行了广泛的研究，该速率远低于当煤颗粒进入锅炉和气化炉时的加热速率。在这项工作中，原位煤焦的等温CO（2）（）气化反应性是在快速加热的TGA和加热台显微镜中进行的。结合XRD和拉曼测定的炭结构参数，描述了在相同温度下的炭反应性。结果表明，随着热解速率的提高，原煤的最大失重率（DTG（max））明显增加，相应的最大失重温度升高。但是，当加热速率超过50 K / min时，加热速率对原位炭样品的气化反应性影响很小。考虑到煤焦结构的物理意义和通用性以及气化反应性拟合，结合XRD和拉曼结构参数来描述气化反应性。建立了快速加热速率下煤焦反应性的新方法，Rs = 0.174 + 43.14d（0）（02，a）/ L-c，L-a + 3.58I（D3）X I-D4 / I-G（2）。此外，还使用视觉加热台显微镜通过图像分析确定原位炭反应性。原位煤焦颗粒的气化过程与原始和中期阶段的收缩颗粒模式相吻合。然而，在高碳转化率下，收缩颗粒图案转变为收缩芯图案。此外，通过快速加热TGA和加热台显微镜，CO抑制效果和颗粒间相互作用解释了气化反应性的差异。

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