<i>In-situ</i> study of effect of migrating alkali metals on gasification reactivity of coal char

MEI Yan-gang; WANG Zhi-qing; ZHANG He; ZHANG Sheng-jian; FANG Yi-tian

doi:10.1016/S1872-5813(21)60031-2

Volume 49 Issue 6

Jun. 2021

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Article Navigation > Journal of Fuel Chemistry and Technology > 2021 > 49(6): 735-741

MEI Yan-gang, WANG Zhi-qing, ZHANG He, ZHANG Sheng-jian, FANG Yi-tian. In-situ study of effect of migrating alkali metals on gasification reactivity of coal char[J]. Journal of Fuel Chemistry and Technology, 2021, 49(6): 735-741. doi: 10.1016/S1872-5813(21)60031-2

Citation:

MEI Yan-gang, WANG Zhi-qing, ZHANG He, ZHANG Sheng-jian, FANG Yi-tian. In-situ study of effect of migrating alkali metals on gasification reactivity of coal char[J]. Journal of Fuel Chemistry and Technology, 2021, 49(6): 735-741. doi: 10.1016/S1872-5813(21)60031-2

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In-situ study of effect of migrating alkali metals on gasification reactivity of coal char

doi: 10.1016/S1872-5813(21)60031-2

1.
Taiyuan Institute of Technology, Taiyuan 030008, China
2.
China State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China

Funds: The project was supported by the Scientific and Technologial Innovation Programs of Higher Education Institutions in Shanxi (2020L0636), and Program for the Discipline Leaders of Taiyuan Institute of Technology (2020XKCG05)

Received Date: 2020-11-23
Rev Recd Date: 2021-01-11

Available Online: 2021-03-30

Publish Date: 2021-06-30

Abstract

Abstract

The migrating and diffusion of alkali metals affect catalytic gasification of coal char. The paper investigated in-situ gasification behaviors of coal char by TG and hot stage microscope, and studied catalytic performance of single NaAlO₂ particle and Na distribution by SEM-EDX. The results show that in the beginning stage, the curve of carbon conversion obtained by area method is consistent with that by TG method. In the ending stage, the ash in coal char acts as framework of the particles, as a result, area of the particles keeps unchanged. Meanwhile, the ash hinders diffusion of gasifying agent into coal char, and decreases the gasification rate, so carbon conversion rate calculated by area change is lower than that from TG. The single NaAlO₂ particle has catalytic performance. The coal char particles, which are closer to NaAlO₂, have higher gasification reactivity, because the amount of migrating alkali is higher. The migrating distance of NaAlO₂ is higher than 840 μm at 900 ℃ .
- catalytic gasification,
- alkali metals,
- gasification,
- migrating of alkali metals

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References

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