摘要
在双固定床反应器和热重分析仪上研究了丙酸改性对电石渣循环捕集CO_2性能的影响规律。结果表明,丙酸改性提高了电石渣循环碳酸化转化率,并且延缓了随循环次数增加碳酸化转化率的衰减。利用离子反应模型从碳酸化反应动力学角度分析了丙酸改性提高电石渣循环捕集CO_2性能的机理。相同循环次数条件下,丙酸改性电石渣快速反应阶段化学反应速率常数k和本阶段最终碳酸化转化率X_u均高于电石渣,碳酸化速率达到最大值时的时间t_0短于电石渣。丙酸改性电石渣碳酸化反应速率更快,能以一个较短的时间取得更高的碳酸化转化率。丙酸改性优化了煅烧后电石渣的孔隙结构,提高了20~100nm范围内的孔面积和比孔容,降低了扩散阻力,这是其表现优于电石渣动力学特性参数的原因。
The CO2 capture capacity of carbide slag modified by propionic acid was investigated in a dual fixed-bed reactor and a TGA. The result shows that modification by propionic acid can improve the cyclic carbonation conversion of carbide slag and delay the decays of carbonation conversion with number of cycles. An ion reactive adsorption model was employed to describe the mechanism why modification by propionic acid can improve the CO2 capture capacity of carbide slag. With the same number of cycles, the values of k and Xu of carbide slag modified by propionic acid are higher than those without modification, while the value of to is shorter. The modified carbide slag shows higher carbonation rate and can achieve a relative higher carbonation conversion with a shorter time. Modification by propionic acid improves the microstructure of the carbide slag after calcination. The pore area and pore volume in the range of 20--100nm are increased and the resistance of diffusion is reduced. That＇s why the modified carbide slag shows favorable kinetics parameters superior to carbide slag without modification.
出处
《化工进展》
EI
CAS
CSCD
北大核心
2017年第6期2325-2330,共6页
Chemical Industry and Engineering Progress
基金
江苏省高校自然科学基金(16KJB470005
14KJD470003)
南京工程学院引进人才科研启动基金(YKJ201410)项目
关键词
钙循环
电石渣
改性
CO2捕集
动力学
calcium looping process
carbide slag
modification
CO2 capture
kinetics
