丙酸改性提高电石渣捕集CO2性能的动力学分析

doi:10.16085/j.issn.1000-6613.2017.06.051

化工进展 ›› 2017, Vol. 36 ›› Issue (06): 2325-2330.DOI: 10.16085/j.issn.1000-6613.2017.06.051

丙酸改性提高电石渣捕集CO₂性能的动力学分析

孙荣岳, 叶江明, 毕小龙, 陈凌海

南京工程学院能源与动力工程学院, 江苏南京 211167

收稿日期:2016-10-28 修回日期:2016-12-06 出版日期:2017-06-05 发布日期:2017-06-05
通讯作者: 孙荣岳
作者简介:孙荣岳(1986—),男,博士,讲师,研究方向为CO₂捕集、燃烧污染物控制。E-mail:sunrongyue@163.com。
基金资助:
江苏省高校自然科学基金（16KJB470005，14KJD470003）及南京工程学院引进人才科研启动基金（YKJ201410）项目。

Kinetic analysis on CO₂ capture performance of carbide slag modified by propionic acid

SUN Rongyue, YE Jiangming, BI Xiaolong, CHEN Linghai

School of Energy and Power Engineering, Nanjing Institute of Technology, Nanjing 211167, Jiangsu, China

Received:2016-10-28 Revised:2016-12-06 Online:2017-06-05 Published:2017-06-05

摘要/Abstract

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CO₂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CO₂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t₀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。

关键词: 钙循环, 电石渣, 改性, CO₂捕集, 动力学

Abstract: 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 X_u of carbide slag modified by propionic acid are higher than those without modification,while the value of t₀ 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.

Key words: calcium looping process, carbide slag, modification, CO₂ capture, kinetics

中图分类号:

X511

孙荣岳, 叶江明, 毕小龙, 陈凌海. 丙酸改性提高电石渣捕集CO₂性能的动力学分析[J]. 化工进展, 2017, 36(06): 2325-2330.

SUN Rongyue, YE Jiangming, BI Xiaolong, CHEN Linghai. Kinetic analysis on CO₂ capture performance of carbide slag modified by propionic acid[J]. Chemical Industry and Engineering Progress, 2017, 36(06): 2325-2330.

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丙酸改性提高电石渣捕集CO₂性能的动力学分析

Kinetic analysis on CO₂ capture performance of carbide slag modified by propionic acid

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