Reaction mechanism model of the CO2 absorption with K2CO3 sorbents

被引：0
|
作者：
机构：
[1] Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Southeast University, Nanjing, 210096, Jiangsu Province
[2] Electrical Power Simulation and Control Engineering Center, Nanjing Institute of Technology, Nanjing, 210013, Jiangsu Province
来源：
Zhang, Zhonglin | 1600年 / Chinese Society for Electrical Engineering卷 / 34期
关键词：
Absorption; Carbon dioxide; Potassium carbonate; Shrinking core model;
D O I：
10.13334/j.0258-8013.pcsee.2014.23.005
中图分类号：
学科分类号：
摘要：
The particle diameter had an important influence on the rate of gas-solid reaction. The chemical reaction mechanism of K2CO3 sorbents absorbing CO2 was analyzed in a reconstructive thermogravimetric analyzer and the effect of the diameter on the sorbents conversion rate was investigated. A shrinking core model was developed to describe the reaction of CO2 with K2CO3 particles. The inner diffusion coefficient and reaction rate were calculated through thermogravimetric data, which were key parameters in the model. Meanwhile, an association relationship between diffusion coefficient and conversion rate was created. The result shows that the transformation from reaction control step to inner diffusion control step is observed in sorbents with all sizes. The increase of diameter is harmful to the reaction and the diffusion coefficient decreases with the increase of the conversion rate. The accordance of model data and experiment data verified the accuracy of model which provided a basis for a further study. © 2014 Chinese Society for Electrical Engineering.
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页码：3865 / 3873
页数：8
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