Structure evolution of lignite char in step pyrolysis and its combustion reactivity
文献类型：期刊论文
| 作者 | Qi, Jianan1,2; Fan, Chuigang1,2; Wu, Hao2,3; Li, Songgeng1,2,4 |
| 刊名 | FUEL
 |
| 出版日期 | 2022-05-01 |
| 卷号 | 315页码:7 |
| ISSN号 | 0016-2361 |
| 关键词 | Step pyrolysis Crossing-linking reaction Lignite char Structure evolution |
| DOI | 10.1016/j.fuel.2022.123256 |
| 英文摘要 | Step pyrolysis was conducted in a laboratory-scale fixed bed reactor for char preparation. Characterization techniques such as volume solvent swelling, thermal gravimetric analysis (TGA), X-ray diffraction (XRD) and Xray photoelectron spectroscopy (XPS) were applied to reveal char structure evolution during step pyrolysis. Combustion reactivities of the prepared chars were examined at a thermal gravimetric analyzer. Newly formed bond structures in char such as Cal-Cal and Car-Cal/O have been identified at the 1st stage of step pyrolysis, which evidences the occurrence of cross-linking reactions. As a result, step pyrolysis has higher char yield than direct pyrolysis. The char yield from step pyrolysis increases as the 1st stage pyrolysis temperature increases and reaches a maximum at 773 K. An index was put forward to assess the extent of cross-linking reactions during pyrolysis, which is well correlated with char production. The char from step pyrolysis has relatively high graphitization degree than from direct pyrolysis, and thus has lower combustion reactivity. Step pyrolysis can suppress sulfur and nitrogen release in comparison with direct pyrolysis owing to the formation of more stable sulfur and nitrogen species in char. The difference in nitrogen release varies within 8 percentage points and for sulfur release, it is within 5 percentage points under the examined experimental conditions. |
| WOS关键词 | GASIFICATION ATMOSPHERE ; RANK COALS ; NITROGEN ; TEMPERATURE ; TRANSFORMATION ; SULFUR |
| 资助项目 | "Strategic Priority Research Program" of the Chinese Academy of Sciences[XDA21040400] ; National Natural Science Foundation of China[21978305] |
| WOS研究方向 | Energy & Fuels ; Engineering |
| 语种 | 英语 |
| 出版者 | ELSEVIER SCI LTD |
| WOS记录号 | WOS:000747386700002 |
| 资助机构 | "Strategic Priority Research Program" of the Chinese Academy of Sciences ; National Natural Science Foundation of China |
| 源URL | [http://ir.ipe.ac.cn/handle/122111/51843]  |
| 专题 | 中国科学院过程工程研究所 |
| 通讯作者 | Li, Songgeng |
| 作者单位 | 1.Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing, Peoples R China 2.Univ Chinese Acad Sci, Sino Danish Coll, Sino Danish Ctr Educ & Res, Beijing, Peoples R China 3.Tech Univ Denmark, Dept Chem & Biochem Engn, Soltofts Plads 228A, DK-2800 Lyngby, Denmark 4.Univ Chinese Acad Sci, Sch Chem Engn, Beijing, Peoples R China |
| 推荐引用方式 GB/T 7714 | Qi, Jianan,Fan, Chuigang,Wu, Hao,et al. Structure evolution of lignite char in step pyrolysis and its combustion reactivity[J]. FUEL,2022,315:7. |
| APA | Qi, Jianan,Fan, Chuigang,Wu, Hao,&Li, Songgeng.(2022).Structure evolution of lignite char in step pyrolysis and its combustion reactivity.FUEL,315,7. |
| MLA | Qi, Jianan,et al."Structure evolution of lignite char in step pyrolysis and its combustion reactivity".FUEL 315(2022):7. |
入库方式： OAI收割
来源：过程工程研究所
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