化工学报 ›› 2013, Vol. 64 ›› Issue (11): 4187-4195.DOI: 10.3969/j.issn.0438-1157.2013.11.041

• 能源和环境工程 • 上一篇    下一篇

钠修饰铁矿石载氧体的串行流化床煤化学链燃烧试验

张思文, 沈来宏, 顾海明, 刘卫东, 葛晖俊   

  1. 东南大学能源与环境学院, 能源热转换及其过程测控教育部重点实验室, 江苏 南京 210096
  • 收稿日期:2013-03-20 修回日期:2013-08-09 出版日期:2013-11-05 发布日期:2013-11-05
  • 通讯作者: 沈来宏
  • 作者简介:张思文(1987-),女,博士研究生。
  • 基金资助:

    国家自然科学基金项目(51276037);江苏省科技支撑项目(BE2012166)。

Chemical-looping combustion of coal in interconnected fluidized bed using Na-loaded iron ore as oxygen carrier

ZHANG Siwen, SHEN Laihong, GU Haiming, LIU Weidong, GE Huijun   

  1. Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, Jiangsu, China
  • Received:2013-03-20 Revised:2013-08-09 Online:2013-11-05 Published:2013-11-05
  • Supported by:

    supported by the National Natural Science Foundation of China(51276037)and the Key Technology Research and Development Program of Jiangsu Province of China(BE2012166).

摘要: 利用1 kWth串行流化床反应器对钠修饰铁矿石载氧体进行试验研究,考察燃料反应器温度对煤化学链催化燃烧特性的影响。结果表明,钠在820~920℃温度下显著促进了煤气化反应的进行,随着燃料反应器温度的提高,使用Na-铁矿石时燃料反应器出口CO2浓度明显增大,CO浓度明显降低,在920℃时CO2捕集效率和碳捕集效率分别达到78.60%和80.54%,而使用纯铁矿石时CO2捕集效率和碳捕集效率仅为40.27%和45.65%。在高温950℃时Na-铁矿石活性下降,出现烧结和团聚现象,燃料反应器出现滞流态化现象,这可能是钠的化合物熔点较低和载氧体过度还原所导致的。XRD和SEM分析结果显示钠修饰铁矿石促使更多的Fe2O3被还原为Fe3O4

关键词: 煤燃烧, 催化, 二氧化碳, 铁矿石, 化学链燃烧

Abstract: Chemical-looping combustion(CLC)is a promising technology with inherent separation of CO2.Because coal is cheaper and more abundant than gaseous fuel,it is attractive to adapt CLC for use with coal.The gasification process of coal is the limiting step,so this study presented an enhancement of gasification rate of coal using Na-loaded iron ore as oxygen carrier in a 1 kWth continuous reactor.The effect of fuel reactor temperature on the chemical-looping combustion of coal was investigated.The results showed that the catalytic effect of Na on coal gasification was obvious in the fuel reactor temperature range of 820-920℃.There was an obvious increase in the concentration of CO2 from fuel reactor and a decrease in the concentration of CO with the increase of fuel reactor temperature.The CO2 capture efficiency and carbon capture efficiency for Na-loaded iron ore were 78.60% and 80.54% respectively,whereas those for iron ore were 40.27% and 45.65%.The Na-loaded iron ore showed sintering and agglomeration on the oxygen carrier particles and the defluidization phenomena of the fuel reactor was observed at a fuel reactor temperature of 950℃.This was likely due to the low melting point of the sodium compounds and the over-reduction of the oxygen carrier.SEM and XRD analysis showed that the reduction degree of Fe2O3 in the oxygen carrier using Na-loaded iron ore was intensively enhanced.

Key words: coal combustion, catalysis, carbon dioxide, iron ore, chemical-looping combustion

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