Kinetic modelling and experimental validation of single large particle combustion of coal char
文献类型：期刊论文
| 作者 | Wang, Jingjing1,2; Hu, Shanwei1; Liu, Xinhua1 |
| 刊名 | CHEMICAL ENGINEERING JOURNAL
 |
| 出版日期 | 2022-12-15 |
| 卷号 | 450页码:15 |
| ISSN号 | 1385-8947 |
| 关键词 | Mathematical modeling Heterogeneous reaction Single particle model Char combustion Unreacted core Computational fluid dynamics |
| DOI | 10.1016/j.cej.2022.138227 |
| 英文摘要 | Understanding apparent kinetics of single large fuel particle combustion is of significance to the design and optimization of grate-firing and circulating fluidized bed boilers. Based on the concept of finite reaction zone approximation, a simple heterogeneous single particle model was formulated to consider the effects of external gas film, ash layer and chemical reaction simultaneously. To validate the proposed model and gain insight into the prevailing rate-controlling mechanism during the single particle combustion process at different combustion temperatures and particle sizes, the experiments on the combustion of coal char powder and single large char particles were carried out in a thermal gravimetric analyzer and a bench scale fixed-bed reactor, respectively. The intrinsic and apparent kinetics as well as the effective reacting zone thickness of single large particle combustion were quantified by combining theoretical analyses and experimental data. Both the bulk flow temperature and particle size have a remarkable influence on the global reactivity. The rate-controlling process was found to shift from the intrinsic chemical reaction to ash layer diffusion and return again to the intrinsic kinetics at the burnout stage. Particularly, an external effectiveness factor was defined as a function of conversion degree to better describe the ash diffusion effect on the apparent reactivity of large particles. The proposed model is physically general but simple enough to be incorporated into the computational fluid dynamic simulation of large-scale grate-firing and fluidized bed boilers. |
| WOS关键词 | FLUIDIZED-BED COMBUSTION ; GAS-SOLID REACTIONS ; LOW-RANK COAL ; SHRINKING CORE MODEL ; ACTIVATION-ENERGY ; CO2 GASIFICATION ; BIOMASS ; CARBON ; OXIDATION ; REACTORS |
| 资助项目 | Strategic Priority Research Program of the Chinese Academy of Sciences[XDA21040400] ; National Natural Science Foundation of China[22008240] ; Youth Innovation Promotion Association of the Chinese Academy of Sciences[2022046] |
| WOS研究方向 | Engineering |
| 语种 | 英语 |
| 出版者 | ELSEVIER SCIENCE SA |
| WOS记录号 | WOS:000862545800004 |
| 资助机构 | Strategic Priority Research Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; Youth Innovation Promotion Association of the Chinese Academy of Sciences |
| 源URL | [http://ir.ipe.ac.cn/handle/122111/54947]  |
| 专题 | 中国科学院过程工程研究所 |
| 通讯作者 | Hu, Shanwei; Liu, Xinhua |
| 作者单位 | 1.Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China 2.Univ Chinese Acad Sci, Sch Chem Engn, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang, Jingjing,Hu, Shanwei,Liu, Xinhua. Kinetic modelling and experimental validation of single large particle combustion of coal char[J]. CHEMICAL ENGINEERING JOURNAL,2022,450:15. |
| APA | Wang, Jingjing,Hu, Shanwei,&Liu, Xinhua.(2022).Kinetic modelling and experimental validation of single large particle combustion of coal char.CHEMICAL ENGINEERING JOURNAL,450,15. |
| MLA | Wang, Jingjing,et al."Kinetic modelling and experimental validation of single large particle combustion of coal char".CHEMICAL ENGINEERING JOURNAL 450(2022):15. |
入库方式： OAI收割
来源：过程工程研究所
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