天然铁矿石为氧载体的生物质化学链气化制合成气实验研究

黄振; 何方; 李海滨; 赵增立

天然铁矿石为氧载体的生物质化学链气化制合成气实验研究

中国科学院广州能源研究所中国科学院可再生能源与天然气水合物重点实验室, 广东广州 510640

基金项目: 国家自然科学基金(50776091); 中国科学院广州能源所所长创新基金重点培育项目(o807z2); "十二五"国家科技支撑计划(2011BAD15B05)。

详细信息

通讯作者:
何方, Tel: 020-87057721, E-mail: hefang@ms.giec.ac.cn。

中图分类号: TK6
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出版历程
- 收稿日期: 2011-04-21
- 刊出日期: 2012-03-31

Synthesis gas generation by chemical-looping gasification of biomass using natural hematite as oxygen carrier

Key Laboratory of Renewable Energy and Gas Hydrate of Chinese Academy of Sciences, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China

摘要

摘要: 在一个小型鼓泡流化床反应器上以Ar气为流化介质,对以天然铁矿石为氧载体的生物质化学链气化制合成气过程进行了研究。考察了反应温度对合成气组分、气体产率、碳转化率以及气化效率的影响,反应时间对合成气组分的影响;探讨了氧载体存在对生物质气化过程的影响。结果表明,天然铁矿石可以作为生物质化学链气化制合成气反应过程的氧载体,代替富氧空气或高温水蒸气作为生物质气化的气化剂;随着温度的升高,产物气体中CO、H₂的浓度逐渐增加,CO₂、CH₄浓度缓慢降低;随着反应时间的延长,合成气中H₂、CO、CH₄的相对浓度缓慢增加,而CO₂相对浓度逐渐降低;氧载体的存在能显著提高气体产率和碳的转化率及气化效率。扫描电镜-能谱(SEM-EDS)分析表明,当超过850 ℃时,铁矿石氧载体颗粒表面烧结现象明显,但反应前后,颗粒表面的成分及含量基本保持不变。
- 生物质 /
- 化学链气化 /
- 铁矿石 /
- 合成气 /
- 氧载体
Abstract: The chemical looping gasification (CLG) of biomass with natural hematite (Fe₂O₃) as oxygen carrier was experimentally investigated in a bubbling fluidized bed reactor using argon as fluidizing gas. The effects of reaction temperature, resistance time, and the presence of oxygen carrier on the syngas composition, gas yield, carbon conversion, and gasification efficiency were examined. The experimental results show that the natural hematite can be used as oxygen carrier in CLG of biomass. The concentration of CO and H₂ increases slightly, while that of CO₂ and CH₄ declines slightly with the increasing of temperature during biomass gasification. In addition, the concentration of H₂, CO, and CH₄ in the syngas slowly increases with the reaction time, but CO₂ concentration shows an opposite trend. The presence of oxygen carrier can significantly increase the gas yield and carbon conversion. The analysis by Scanning electron microscopy-Energy Disperse Spectroscopy (SEM-EDS) shows that the iron ore oxygen carrier is obviously sintered when the reaction temperature is greater than 850 ℃. However, the composition of element on the particle surface changes little during the reaction.
- biomass /
- chemical-looping gasification /
- iron ore /
- synthesis gas /
- oxygen carrier

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参考文献(15)

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