石油学报(石油加工) ›› 2020, Vol. 36 ›› Issue (6): 1148-1160.doi: 10.3969/j.issn.1001-8719.2020.06.005

• 化学链燃烧 • 上一篇    下一篇

CO2对高铁高钙煤灰载氧体炉内脱汞的影响

刘壮,刘敦禹,金晶,冯亮,倪明国   

  1. 上海理工大学 能源与动力工程学院 上海市 动力工程多相流动与传热重点实验室,上海 200093
  • 收稿日期:2020-06-22 修回日期:2020-07-29 出版日期:2020-11-25 发布日期:2020-12-02
  • 通讯作者: 刘敦禹,男,副教授,博士,从事洁净煤燃烧研究,E-mail:liudunyu@usst.edu.cn E-mail:liudunyu@usst.edu.cn
  • 作者简介:刘壮,男,硕士研究生,从事节能技术与新能源研究
  • 基金资助:
    国家自然科学基金项目(51706143和51976129)资助

Effects of CO2 on Mercury Removal in Furnace With High Iron and Calcium Coal Ash Oxygen Carrier

 LIU Zhuang, LIU Dunyu, JIN Jing, FENG Liang, NI Mingguo   

  1.  Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
  • Received:2020-06-22 Revised:2020-07-29 Online:2020-11-25 Published:2020-12-02
  • Supported by:
     

摘要:

为探索煤化学链燃烧过程脱汞的可行性,以具有较高反应活性的高铁高钙煤灰(HICCA)为载氧体,在固定床反应器上研究了CO2对HICCA催化氧化Hg0的作用,并用XRD、EDS对HICCA样品进行表征,采用热力学平衡计算揭示其作用机理。结果表明:CO2对Hg0的氧化作用十分微弱,但提高了HICCA的脱汞效率,其促进作用归因于HICCA组分中CaSO4与CO的反应,减弱了CO对HgO的还原,并促进了CO2向O的分解。HICCA在HCl气氛下表现出良好的脱汞效果,但该系统在CO2气氛下则严重受限。CO2不仅严重抑制了HCl对Hg0的气相氧化,也严重抑制了HICCA中Fe2O3和CaSO4在HCl气氛下对Hg0的氧化效果。

关键词: 高铁高钙煤灰载氧体, 烟气脱汞, 化学链燃烧, 煤气化介质

Abstract:

In order to explore the feasibility of Hg removal in CLC of coal, the high iron and calcium coal ash (HICCA) with high reactivity was used as the oxygen carrier. The effects of CO2 on Hg0 catalytic oxidation were studied in a fixed bed reactor, and the sample HICCA was characterized by XRD and EDS, the relevant mechanisms were determined using the thermal equilibrium calculation. The experimental results show that the homogeneous oxidation capacity of high content of CO2 on Hg0 is extremely weak. High content of CO2 enhances the capacity of HICCA on the heterogeneous removal of Hg0. This phenomenon could be attributed to the reaction between CaSO4 in HICCA and CO, which not only undermines the reduction of CO on HgO, but also promotes the decomposition of CO2 to O. HICCA exhibits a prominent efficiency on Hg0 removal in HCl atmosphere, while the efficiency is significantly undermined under a high concentration of CO2. The inhibition of CO2 could be attributed to both the homogeneous pathway and the heterogeneous pathway with Fe2O3 and CaSO4 in HICCA.

Key words: oxygen carrier of HICCA, mercury removal, chemical loop combustion

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