Chemical/physical properties of char during devolatilization in inert and reducing conditions
Chemical/physical properties of char during devolatilization in inert and reducing conditions
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惰性和还原条件下脱挥发分过程中炭的化学/物理性质
DOI：
10.1016/j.fuproc.2013.09.012
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发表时间：
2014-02
影响因子：
7.5
通讯作者：
Wang, Dong
中科院分区：
文献类型：
--
作者：
Qian, Lin;Zhao, Yijun;Sun, Shaozeng;Che, Hongwei;Chen, Hong;Wang, Dong
煤焦的活性很大程度上取决于煤焦的化学/物理性质。本研究以元宝山褐煤为原料，在DTF（1473 K，2 × 104 K/s，N2）和FFR（1473 K，2 × 104 K/s，N2）条件下，在类似于工业燃烧富油区的还原气氛下进行快速热解，得到了半焦。为了更好地了解煤焦的反应活性，对不同挥发分程度的煤焦和煤的化学结构和物理性质进行了研究，并利用13 C-NMR对煤焦的化学结构进行了定量测定。采用N2吸附法和CO2吸附法表征了其物理性质。结果表明，热解是一个脂肪族化合物释放的过程，大量微孔形成，大孔减少。成熟半焦的化学结构与热解条件无关。DTF和FFR成熟焦的化学结构非常相似，但工业分析和元素分析结果不同。成熟焦表现出不同的物理性质，其中FFR成熟焦主要具有微孔，而DTF成熟焦同时含有微孔和中孔。在不同热解条件下形成的完全挥发分半焦的反应性主要取决于其物理性质而不是化学结构。
The activities of coal chars strongly depend on char chemical/physical properties. In this work, the chars were obtained from rapid pyrolysis of Yuanbaoshan lignite in DTF (1473 K, 2 × 104K/s, in N2), and in FFR under reducing atmosphere similar to that in fuel-rich region of full scale combustion. The chemical structures and physical properties of coal and chars from different extent of devolatilization were examined in order to get a better understanding of char reactivity.13C-NMR was used to measure the chemical structures quantitatively. N2adsorption and CO2adsorption were applied to characterize the physical properties. Results show that pyrolysis is a process of aliphatic compounds release, with a huge number of micropores formed and macropores declined. The chemical structures of mature char are independent of the pyrolysis conditions. The chemical structures of mature chars from both DTF and FFR are remarkably similar, although the proximate and ultimate analyses of them are different. Mature chars show different physical properties, with FFR mature char mainly having micropores and DTF mature char containing both micropores and mesopores. The different reactivity of fully devolatilized chars formed in different pyrolysis conditions mainly depends on physical properties rather than on chemical structures.
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影响因子：
5.3
作者：
SOLUM, MS;PUGMIRE, RJ;GRANT, DM
通讯作者：
GRANT, DM
影响因子：
5.3
作者：
T. Fletcher;S. Bai;R. Pugmire;M. Solum;S. Wood;D. Grant
通讯作者：
T. Fletcher;S. Bai;R. Pugmire;M. Solum;S. Wood;D. Grant
影响因子：
5.3
作者：
Shaozeng Sun;Juwei Zhang;Xidong Hu;Shaohua Wu;Jiancheng Yang;Yangjie Wang;Yukun Qin
通讯作者：
Shaozeng Sun;Juwei Zhang;Xidong Hu;Shaohua Wu;Jiancheng Yang;Yangjie Wang;Yukun Qin
影响因子：
6
作者：
M. Alonso;A. Borrego;D. Alvarez;J. Parra;R. Menéndez
通讯作者：
M. Alonso;A. Borrego;D. Alvarez;J. Parra;R. Menéndez
影响因子：
5.3
作者：
J. A. Franz;Roberto García;J. Linehan;G. Love;C. Snape
通讯作者：
J. A. Franz;Roberto García;J. Linehan;G. Love;C. Snape