The Effect of H2O on the Reactivity and Microstructure of Metallurgical Coke
The Effect of H2O on the Reactivity and Microstructure of Metallurgical Coke
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H2O对冶金焦反应活性和微观结构的影响
DOI：
10.1002/srin.201700063
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发表时间：
2017-08-01
影响因子：
2.2
通讯作者：
Xue, Zhengliang
中科院分区：
文献类型：
--
作者：
Wang, Wei;Dai, Bowen;Xue, Zhengliang
采用改进后的焦炭气化反应装置，考察了焦炭反应活性和反应后强度的变化规律，以及焦炭微观结构和孔径的变化规律。通过热力学计算，说明了碳与CO2或H2O反应的不平衡性。结果表明，H2O能促进焦炭气化反应，焦炭反应性(CRI)随Phi(H2O)的增加而增加，而焦炭强度(CSR)则相反。扫描电子显微镜观察结果表明，反应后焦炭内部和表面都受到了不同程度的侵蚀，焦炭内部与纯CO2反应后产生了较大的气孔。而焦炭内部与CO2和H2O混合气体反应产生的气孔较多，表面破坏严重。此外，混合气体气化焦炭的气孔面积百分比大于纯CO2气化焦炭。X射线衍射结果表明，反应后焦炭的石墨化程度增加，当反应气氛为CO2-H2O混合气体时，焦炭的石墨化程度达到最大，主要是由于H2O促进了各向同性的消耗。
The improved device of coke gasification reaction is employed to investigate the change rules of coke reactivity and strength after reaction, as well as coke microstructure, and pore size. Thermodynamic calculation is conducted to illustrate the imparity of the reaction between carbon with CO2 or H2O. The results show that H2O can promote the coke gasification reaction, and the coke reactivity (CRI) increases with the increasing phi(H2O), while the coke strength (CSR) has the opposite trend. The SEM observation results show that the interior and surface parts of cokes are all eroded at difference degrees after reaction, and the interior part of coke generates more large pores after reacted with pure CO2. While the interior part of coke that reacted with CO2 and H2O gas mixture generate more small pores, and the surface part is severely damaged. Moreover, the area percentage of oversized pores of coke gasified with gas mixture is larger than that of the coke gasified with pure CO2. The results of XRD indicate that the graphitization of coke increases after the reaction and reaches the highest when the reaction atmosphere is the CO2-H2O gas mixture, mainly due to the promotion of H2O to the consumption of isotropy.