Volume 49 Issue 11
Nov.  2021
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Article Contents
JIA Xin, WANG Qin-hui, ZHANG Yu-hui, HAN Zhen-nan, SONG Xing-fei, WANG Chao, FU Liang-liang, XU Guang-wen. The effects of coal ash on sulfur transformation during secondary reactions of coal pyrolysis[J]. Journal of Fuel Chemistry and Technology, 2021, 49(11): 1577-1583. doi: 10.19906/j.cnki.JFCT.2021081
Citation: JIA Xin, WANG Qin-hui, ZHANG Yu-hui, HAN Zhen-nan, SONG Xing-fei, WANG Chao, FU Liang-liang, XU Guang-wen. The effects of coal ash on sulfur transformation during secondary reactions of coal pyrolysis[J]. Journal of Fuel Chemistry and Technology, 2021, 49(11): 1577-1583. doi: 10.19906/j.cnki.JFCT.2021081

The effects of coal ash on sulfur transformation during secondary reactions of coal pyrolysis

doi: 10.19906/j.cnki.JFCT.2021081
Funds:  The project was supported by Scientific Research Project of Education Department of Liaoning Province (LZ2020003)
  • Received Date: 2021-04-19
  • Rev Recd Date: 2021-09-03
  • Available Online: 2021-10-03
  • Publish Date: 2021-11-30
  • During the coal pyrolysis with the coal ash as heat carrier, the interactions of coal ash and volatile matters could occur in the secondary reactions, which would affect the final sulfur-containing product yields of volatile matter. The objective of this paper was to reveal the effects of coal ash on the sulfur transformation during the secondary reactions. The results showed that the presence of XLT ash during secondary reactions inhibited H2S and COS release at low temperatures due to the sulfur fixation of Fe2O3 existed in the ash. However, it enhanced H2S and COS release at high temperatures, which was mainly caused by the formation of sulfur-containing gases through the reactions between CaSO4 and reducing gas (i.e. H2, CO, and CH4). The influences of Fe2O3 and CaSO4 were also investigated to reveal the mechanism of the influence of coal ash, and it was found that H2S and COS yields were reduced with the addition of Fe2O3, but those two gases were slightly increased by the presence of CaSO4 at 800 ℃, indicating that Fe2O3 and CaSO4 played important roles in the interactions between the coal ash and sulfur-containing gases.
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  • [1]
    QU X, LIANG P, ZHANG R, GAN Z, BI J. Sulfur transformation in the process of circulating fluidized bed combustion combined with coal pyrolysis[J]. Energy Fuels,2010,24(9):5023−5027.
    [2]
    QU X, LIANG P, WANG Z, ZHANG R, SUN D, GONG X, GAN Z, BI J. Pilot development of polygonation process of circulating fluidized bed combustion combined with coal pyrolysis[J]. Chem Eng Technol,2011,34(1):61−68.
    [3]
    XIONG R, DONG L, YU J, ZHANG X, JIN L, XU G. Fundamentals of coal topping gasification: Characterization of pyrolysis topping in a fluidized bed reactor[J]. Fuel Process Technol,2010,91(8):810−817. doi: 10.1016/j.fuproc.2009.07.005
    [4]
    CHEN Y, HE R. Fragmentation and diffusion model for coal pyrolysis[J]. J Anal Appl Pyrolysis,2011,90(1):72−79. doi: 10.1016/j.jaap.2010.10.007
    [5]
    HONG D, CAO Z, GUO X. Effect of calcium on the secondary reactions of tar from Zhundong coal pyrolysis: A molecular dynamics simulation using ReaxFF[J]. J Analy Appl Pyrolysis,2019,137:246−252. doi: 10.1016/j.jaap.2018.11.033
    [6]
    TSUBOUCHI N, OHTSUKA Y. Nitrogen chemistry in coal pyrolysis: Catalytic roles of metal cations in secondary reactions of volatile nitrogen and char nitrogen[J]. Fuel Process Technol,2008,89(4):379−390. doi: 10.1016/j.fuproc.2007.11.011
    [7]
    XU W C, TOMITA A. The effects of temperature and residence time on the secondary reactions of volatiles from coal pyrolysis[J]. Fuel Process Technol,1989,21(1):25−37. doi: 10.1016/0378-3820(89)90012-X
    [8]
    ZHANG H, FLETCHER T H. Nitrogen transformations during secondary coal pyrolysis[J]. Energy Fuels,2001,15(6):1512−1522.
    [9]
    ZHANG Y Q, PAN D F, QU X, LIANG P. Secondary catalytic effect of circulating ash on the primary volatiles from slow and fast pyrolysis of coal[J]. Energy Fuels,2018,32(2):1328−1335.
    [10]
    LIN Y H, CHEN Y C, CHU H. The mechanism of coal gas desulfurization by iron oxide sorbents[J]. Chemosphere,2015,121:62−67. doi: 10.1016/j.chemosphere.2014.11.010
    [11]
    沈洪波, 张辉, 刘应书, 李皓琰, 张贺, 郝智天. 改性Fe2O3脱硫剂脱除H2S反应特性[J]. 环境工程学报,2015,9(9):4458−4464. doi: 10.12030/j.cjee.20150958

    SHEN Hong-bo, ZHANG Hui, LIU Ying-shu, LI Hao-yan, ZHANG He, HAO Zhi-tian. Reaction characteristics of removal of H2S by modified Fe2O3 desulfurizer[J]. Chin J Environ Eng,2015,9(9):4458−4464. doi: 10.12030/j.cjee.20150958
    [12]
    宋华, 罗威, 许林祥, 张娇静. Al2O3/Fe2O3吸附剂脱除硫化氢的性能[J]. 化工进展,2013,32(4):779−785.

    SONG Hua, LUO Wei, XU Lin-xiang, ZHANG Jiao-jing. Performance of Al2O3/Fe2O3 in H2S adsorption[J]. Chem Ind Eng Prog,2013,32(4):779−785.
    [13]
    王娜, 马国明. 活性Fe2O3脱硫剂脱除页岩干馏瓦斯气中H2S的能力分析[J]. 露天采矿技术,2008,(z1):86−87. doi: 10.3969/j.issn.1671-9816.2008.z1.041

    WANG Na, MA Guo-ming. Ability analysis of active Fe2O3 desulfurizer to remove H2S from gas in shale retorting[J]. Opencst Min Technol,2008,(z1):86−87. doi: 10.3969/j.issn.1671-9816.2008.z1.041
    [14]
    XIAO R, SONG Q. Characterization and kinetics of reduction of CaSO4 with carbon monoxide for chemical-looping combustion[J]. Combust Flame,2011,158(12):2524−2539. doi: 10.1016/j.combustflame.2011.05.011
    [15]
    TIAN H, GUO Q, YUE X, LIU Y. Investigation into sulfur release in reductive decomposition of calcium sulfate oxygen carrier by hydrogen and carbon monoxide[J]. Fuel Process Technol,2010,91(11):1640−1649. doi: 10.1016/j.fuproc.2010.06.013
    [16]
    WANG M, HU Y, WANG J, CHANG L, WANG H. Transformation of sulfur during pyrolysis of inertinite-rich coals and correlation with their characteristics[J]. J Analy Appl Pyrolysis,2013,104:585−592. doi: 10.1016/j.jaap.2013.05.010
    [17]
    ZHOU Q, HU H Q, LIU Q R, ZHU S W, ZHAO R. Effect of atmosphere on evolution of sulfur-containing gases during coal pyrolysis[J]. Energy Fuels,2005,19(3):892−897. doi: 10.1021/ef049773p
    [18]
    周强. 煤的热解行为及硫的脱除[D]. 大连: 大连理工大学, 2004.

    ZHOU Qiang. Behavior of coal and sulfur removal during pyrolysis[D]. Dalian: Dalian University of Technology, 2004.
    [19]
    刘全润. 煤的热解转化和脱硫研究[D]. 大连: 大连理工大学, 2006.

    LIU Quan-run. Coal conversion and desulfurization during pyrolysis[D]. Dalian: Dalian University of Technology, 2004.
    [20]
    陈皓侃. 热解和加氢热解过程中硫变迁规律的研究[D]. 太原: 中国科学院山西煤炭化学研究所, 1998.

    CHEN Hao-kan. Sulfur changes during pyrolysis and hydropyrolysis[D]. Taiyuan: Institute of Coal Chemistry, Chinese Academy of Sciences, 1998.
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