Mechanism of CO2 capture by ethanol-biochar functionalized cross-linking enhanced ammonia
Mechanism of CO2 capture by ethanol-biochar functionalized cross-linking enhanced ammonia
复制标题
乙醇-生物炭功能化交联增强氨捕获CO2的机理
DOI：
10.1016/j.fuproc.2023.107796
复制
发表时间：
2023
影响因子：
7.5
通讯作者：
D. Feng;Zhecheng Zhang;Xishan Zhu;Yu Zhang;Z. Luo;Lixiao Luo;Wenda Zhang;C. Wu;Jianmin Gao
中科院分区：
文献类型：
--
作者：
D. Feng;Zhecheng Zhang;Xishan Zhu;Yu Zhang;Z. Luo;Lixiao Luo;Wenda Zhang;C. Wu;Jianmin Gao
CCUS技术是实现能源利用碳中和的重要手段，其中氨法CO2捕集技术相对成熟，但存在CO2吸收效率低、氨逃逸严重等问题。提出了乙醇/生物质炭协同氨碳捕集技术，并通过湿壁柱研究了生物质炭与乙醇的传质系数，以辅助证明生物质炭与乙醇对氨吸收CO2具有协同效应。模拟结果表明，生物炭中的微孔对CO2具有吸附富集作用，中孔和大孔对CO2具有扩散输送作用，并动态截留游离NH3，从而增强了碳捕集系统中CO2的传质能力。实验结果表明，生物炭-乙醇对反应液的传质效率提高了15.4%，高于乙醇的传质效率（7.1%），但生物炭会使氨逃逸严重。如果能够保持氨浓度恒定，生物炭孔结构对CO2向氨中扩散的增强作用将为氨法CO2捕集的改进提供新的方向。
CCUS technology is an important means to achieve carbon neutralization of energy utilization, in which the ammonia CO2-capture method is a relatively mature technology, with some problems (such as low CO2absorption efficiency and serious ammonia escape). An ethanol/biochar synergistic ammonia carbon capture technology is proposed, and the mass transfer coefficient is studied by wetted-wall column, so as to assist in proving that biochar and ethanol have synergistic effect on the absorption of CO2by ammonia. The simulation shows that the micropores in biochar adsorb and enrich CO2, the mesopores and macropores diffuse and transport CO2, and dynamically retain free NH3, thereby enhancing the mass transfer capacity of CO2in the carbon capture system. And the experiment shows that the mass transfer efficiency of biochar-ethanol to the reaction solution is increased by 15.4%, which is higher than that of ethanol (7.1%),but biochar can make ammonia escape seriously. If the ammonia concentration can be maintained constant, the enhancement effect of the pore structure of biochar on the diffusion of CO2into ammonia will provide a new direction for the improvement of CO2capture by ammonia method.