化工进展 ›› 2019, Vol. 38 ›› Issue (s1): 240-246.DOI: 10.16085/j.issn.1000-6613.2019-0212

• 资源与环境化工 • 上一篇    下一篇

铁基载氧体对煤中汞释放行为的影响

高明刚, 刘永卓, 张欣涛, 宋鸣航, 郭庆杰   

  1. 青岛科技大学化工学院, 山东省高等学校清洁化工重点实验室, 山东 青岛 266042
  • 收稿日期:2019-02-11 修回日期:2019-05-14 出版日期:2019-11-16 发布日期:2019-11-16
  • 通讯作者: 刘永卓,博士,副教授,硕士生导师,研究方向为煤/生物质化学链清洁高效转化、多相反应流的数值模拟、流化床反应器设计与优化等。
  • 作者简介:高明刚(1992-),男,硕士研究生,研究方向为污染物排放与控制。E-mail:724138364@qq.com。
  • 基金资助:
    国家自然科学基金青年基金(51506105);山东省重点研发计划(2017GSF16101);青岛市源头创新计划(17-1-1-37-jch)。

Effects of Fe-based oxygen carriers on mercury release behavior from coal

GAO Minggang, LIU Yongzhuo, ZHANG Xintao, SONG Minghang, GUO Qingjie   

  1. College of Chemical Engineering, Qingdao University of Science&Technology, Key Laboratory of Clean Chemical Engineering in Universities of Shandong, Qingdao 266042, Shandong, China
  • Received:2019-02-11 Revised:2019-05-14 Online:2019-11-16 Published:2019-11-16

摘要: 采用Ontario-Hydro方法,在管式炉中考察了煤化学链燃烧/气化过程中Fe4Al6载氧体对煤中汞释放率、气态汞形态分布及汞在两反应器内释放行为的影响。结果表明,载氧体对煤中汞释放率具有显著的影响,在500~700℃,与无载氧体相比,化学链燃烧过程煤中汞释放率减少,化学链气化过程煤中汞释放率增大,而在900℃时,无论化学链燃烧过程还是化学链气化过程,煤中汞释放率均减小。Fe4Al6载氧体能够显著增加燃料反应器出口气态Hg2+的相对含量,其含量随温度的升高而逐渐升高。燃料反应器的温度也是影响煤中汞在两反应器中的分布以及空气反应器中不同价态汞百分含量的重要因素。此外,相同条件下不同煤种的汞释放率不同,主要与煤的组成不同有关。该研究对揭示载氧体对煤中汞迁移的影响机理以及煤化学链转化过程汞的控制提供了实验依据。

关键词: 化学链燃烧, 化学链气化, 汞释放, 载氧体, 形态分布

Abstract: Effects of Fe4Al6 oxygen carriers on mercury release rate, gaseous mercury distribution and mercury release behavior in two reactors in coal chemical looping combustion/gasification process were investigated by Ontario-Hydro method in a tubular furnace. The result showed that Fe4Al6 oxygen carriers could affect the mercury release rate significantly. Compared with the traditional coal pyrolysis, mercury release rate in CLC decreased, while that in CLG increased in 500-700℃. However, mercury release rate in both CLC and CLG was more than that without oxygen carriers at 900℃. Fe4Al6 oxygen carriers can significantly increase the relative content of Hg2+ from fuel reactor (FR) outlet. The relative content of Hg2+ increased with the increasing temperature. Besides the content of oxygen carrier, FR temperature was the primary influence factor on the distribution of mercury from fuel reactor and air reactor as well as the percentage of gaseous mercury speciation in the air reactor. In addition, the mercury release rate was different from types of coal under the same condition, which related mainly to the composition of coal. This study will provide experimental evidence for revealing the influence mechanism of oxygen carriers on mercury migration in the coal and for the control of mercury in coal chemical looping conversion processes.

Key words: chemical looping combustion, chemical looping gasification, mercury release, oxygen carriers, species distribution

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