National Engineering Laboratory for Biomass Power Generation Equipment, North China Electric Power University, Beijing, China.
National Engineering Laboratory for Biomass Power Generation Equipment, North China Electric Power University, Beijing, China.
Bioresour Technol. 2019 Nov;292:121994. doi: 10.1016/j.biortech.2019.121994. Epub 2019 Aug 11.
Bio-char samples were prepared from gasification of corn straw under N, CO and HO conditions, and systematically characterized to reveal the effects of gaseous agents on the evolution of char structural features during the gasification process. The results showed that the increase of reacting temperature had positive effects on the gasification of char in both HO and CO atmospheres. The evolution of char pore structures under HO and CO was quite different. The formation of micropores was facilitated by CO, while mesopores and macropores were developed more in HO condition. Besides, char structures obtained at 800 °C were more ordered than those obtained at 600 °C. Compared with the longitudinal merging, the aromatic layers preferred to grow laterally. Moreover, the mechanisms of gasification between char and gaseous agents were different. CO preferred to react with amorphous carbon, while the cross-linked carbon was more likely to be consumed during char gasification with HO.
生物炭样品是在 N、CO 和 HO 条件下通过玉米秸秆气化制备的，并对其进行了系统的表征，以揭示气态试剂对气化过程中炭结构特征演变的影响。结果表明，升高反应温度对 HO 和 CO 气氛中炭的气化均具有积极作用。HO 和 CO 气氛下炭的孔结构演化有很大差异。CO 促进了微孔的形成，而 HO 条件下则更有利于中孔和大孔的发展。此外，在 800°C 下得到的炭结构比在 600°C 下得到的炭结构更有序。与纵向合并相比，芳香层更倾向于横向生长。此外，炭与气态试剂之间的气化机制也不同。CO 更倾向于与无定形碳反应，而 HO 气化过程中交联碳更易被消耗。
