Influence of pyrolysis temperature on char optical texture and reactivity
Influence of pyrolysis temperature on char optical texture and reactivity
复制标题
DOI：
10.1016/s0165-2370(00)00186-8
复制
发表时间：
2001-04
影响因子：
6
通讯作者：
M. Alonso;A. Borrego;D. Alvarez;J. Parra;R. Menéndez
中科院分区：
文献类型：
--
作者：
M. Alonso;A. Borrego;D. Alvarez;J. Parra;R. Menéndez
在这项研究中，一组 10 种不同级别和显微成分的煤在 1000 和 1300°C 的平焰燃烧器中脱挥发分，以研究炭反应性和结构随热解温度的变化。在 500°C 的热天平中等温测量的炭的固有反应性与炭的岩相特征及其 CO2 表面积有关。热解温度已显示对某些煤的炭反应性有很大影响。总体而言，温度的升高在热解的化质体阶段引起了可塑性的增强和更广泛的固结，并减少了炭中未熔化材料的量。这种效应在低挥发性沥青质镜质体和低级惰性质体中更为明显。高阶煤焦中惰质体衍生材料的存在增强了它们的反应性，而对于低阶煤焦则观察到相反的情况。这是由于惰质组显微组分同时产生各向同性和各向异性材料：低阶煤中的惰性组增加了各向异性、活性较低的炭的量，但在高阶煤中则减少了其量。
In this study a set of 10 coals varying in rank and maceral composition has been devolatilised in a flat flame burner at 1000 and 1300°C in order to investigate the changes in char reactivity and structure as a function of pyrolysis temperature. The intrinsic reactivity of the chars, measured isothermally in a thermobalance at 500°C, has been related to the petrographic characteristics of the chars and their CO2surface areas. The temperature of pyrolysis has shown to have a strong effect on char reactivity for certain coals. Overall, the increase of temperature provoked an enhanced plasticity and a more extensive consolidation during the metaplast stage of pyrolysis and reduced the amount of unfused material in the chars. This effect was more pronounced in low volatile bituminous vitrinites and low rank inertinites. The presence of inertinite derived materials in high rank coal chars enhanced their reactivities, whereas the opposite was observed for low rank coal chars. This was attributed to the fact that inertinite macerals yield both isotropic and anisotropic materials: inertinite in low rank coals increases the amount of anisotropic, less reactive char, but reduces it in high rank coals.