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碱金属迁移对煤焦气化反应性的原位探究

梅艳钢 王志青 张郃 张胜健 房倚天

梅艳钢, 王志青, 张郃, 张胜健, 房倚天. 碱金属迁移对煤焦气化反应性的原位探究[J]. 燃料化学学报. doi: 10.1016/S1872-5813(21)60031-2
引用本文: 梅艳钢, 王志青, 张郃, 张胜健, 房倚天. 碱金属迁移对煤焦气化反应性的原位探究[J]. 燃料化学学报. doi: 10.1016/S1872-5813(21)60031-2
MEI Yan-gang, WANG Zhi-qing, ZHANG He, ZHANG Shengjian, Fang Yi-tian. The in-situ study of effect of migrating alkali metals on coal char gasification reactivity[J]. Journal of Fuel Chemistry and Technology. doi: 10.1016/S1872-5813(21)60031-2
Citation: MEI Yan-gang, WANG Zhi-qing, ZHANG He, ZHANG Shengjian, Fang Yi-tian. The in-situ study of effect of migrating alkali metals on coal char gasification reactivity[J]. Journal of Fuel Chemistry and Technology. doi: 10.1016/S1872-5813(21)60031-2

碱金属迁移对煤焦气化反应性的原位探究

doi: 10.1016/S1872-5813(21)60031-2
基金项目: 山西省教育厅科技创新计划(2020L0636)和太原工业学院青年学科带头人支持计划资助(2020XKCG05)
详细信息
    通讯作者:

    E-mial:meiyangang90@163.com

  • 中图分类号: TQ511

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

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)
  • 摘要: 碱金属迁移与扩散影响煤焦催化气化反应性。本研究通过热重与高温热台显微镜分析了神木煤焦颗粒的原位气化行为,探究了单颗粒NaAlO2催化剂的原位催化作用,并结合SEM-EDX探究了碱金属的分布。结果表明,在气化初期,面积法与热重法得到的碳转化率曲线较为一致;在气化后期,煤焦中灰分会形成颗粒的骨架,在气化过程中使煤焦颗粒面积不发生变化,灰分阻碍气化剂向煤焦扩散,使气化速率降低,通过面积法计算的碳转化率小于热重法。单独的NaAlO2颗粒也具有催化作用,距离催化剂颗粒越近,碱金属的迁移量越大,煤焦颗粒的气化反应性越好,NaAlO2颗粒在900 ℃下迁移距离大于840 um。
  • 图  1  900 ℃下SM煤焦颗粒不同气化时间的热台照片

    Figure  1.  Image of SM coal char at various gasification time under 900 ℃

    图  2  900 ℃下碳转化率随时间变化曲线

    Figure  2.  Carbon conversion curve with time at 900 ℃

    (a): the gasification reactivity of A1-A5 SMC particles; (b): the gasification reactivity of A6-A10 SMC particles; (c): the average carbon conversion by area method and carbon conversion by TG method

    图  3  900 ℃下NaAlO2颗粒催化煤焦颗粒气化反应的热台照片

    Figure  3.  Image of coal char at various gasification time with NaAlO2 particle under 900 ℃

    图  4  距离NaAlO2颗粒不同距离煤焦颗粒的气化行为

    Figure  4.  Gasification behaviors of char particles with different distance to catalyst particles

    (a): the gasification behaviors of char particles in A area; (b): the gasification behaviors of char particles in B area; (c): the gasification behaviors of char particles in C area; (d): the comparison of the mean gasification behaviors between different area and uncatalytic gasification

    图  5  800 ℃下NaAlO2负载量为5 wt%不同停留时间下碳转化率随时间变化关系

    Figure  5.  Carbon conversion curve for various holding time with 5 wt% NaAlO2 loaded

    图  6  机械混合法负载NaAlO2在不同温度下煤焦的SEM-EDX照片

    Figure  6.  the SEM-EDX images of char with mechanical mixing NaAlO2 at different temperatures

    (a): holding temperature at 200 ℃; (b): holding temperature at 500 ℃; (c): holding temperature at 800 ℃

    表  1  神木烟煤与煤焦的工业分析和元素分析

    Table  1.   Proximate and Ultimate Analyses of SM Coal and SMC

    Sampleproximate analysis
    (wt% ada)
    ultimate analysis
    (wt% dafb)
    VFCAMCHNSOc
    SM coal32.4659.256.731.5682.635.071.100.1611.04
    SMC1.4087.7210.310.5796.360.791.390.151.31
    aad: air-dried basis. bdaf: dry ash-free basis. cBy difference
    下载: 导出CSV

    表  2  神木烟煤煤灰的矿物质组成

    Table  2.   Ash Compositions (wt%) of SM Coal

    SampleAl2O3SiO2Fe2O3CaOTiO2MgONa2OSO3K2OP2O5
    SM coal16.8548.075.7919.420.681.040.63.650.810.22
    下载: 导出CSV
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  • 网络出版日期:  2021-03-30

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