The use of ilmenite as oxygen-carrier in a 500Wth Chemical-Looping Coal Combustion unit
The use of ilmenite as oxygen-carrier in a 500Wth Chemical-Looping Coal Combustion unit
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DOI：
10.1016/j.ijggc.2011.09.010
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发表时间：
2011-11
影响因子：
3.9
通讯作者：
Ana Cuadrat;A. Abad;F. García-Labiano;P. Gayán;L. F. D. Diego;J. Adánez
中科院分区：
文献类型：
--
作者：
Ana Cuadrat;A. Abad;F. García-Labiano;P. Gayán;L. F. D. Diego;J. Adánez
化学循环燃烧 (CLC) 是一项很有前途的技术，可以在化石燃料发电厂中以低成本捕获二氧化碳。在 CLC 中，空气中的氧气通过固体氧载体转移到燃料中，固体氧载体在两个互连的流化床反应器（燃料反应器和空气反应器）之间循环。本工作研究了以钛铁矿为载氧体、以烟煤为燃料的 500W 装置中的 CLC 技术。评估了温度和煤颗粒尺寸对煤转化率和燃烧效率的影响。评估了焦炭气化以及气化产物和挥发物的燃烧。在较高温度下，促进气化和燃烧反应。碳捕获和燃烧效率随着温度的升高而提高，在温度高于 910°C 时提高得更快。排出的未燃烧气体来自未被钛铁矿完全氧化的挥发性物质。测得的 CH4 很少，燃料反应器出口既没有比 CH4 重的碳氢化合物，也没有焦油。在 870°C 时，炭转化率为 15%，在 950°C 时达到 82%。燃料反应器中的燃烧效率从 870°C 时的 70% 提高到 950°C 时的 95%。结果表明，钛铁矿作为氧载体具有良好的性能，并且用煤优化 CLC 可以实现高 CO2 捕获的能源生产。
Chemical-Looping Combustion, CLC, is a promising technology to capture CO2at low cost in fossil-fuelled power plants. In CLC the oxygen from air is transferred to the fuel by a solid oxygen-carrier that circulates between two interconnected fluidized-bed reactors: the fuel- and the air-reactor. This work studies the CLC technology in a 500Wthfacility fuelled with bituminous coal with ilmenite as oxygen-carrier. The effect of temperature and coal particle size on coal conversion and combustion efficiency was assessed. Char gasification and combustion of both gasification products and volatile matter were evaluated. At higher temperatures, gasification and combustion reactions are promoted. Carbon capture and combustion efficiencies grow with the temperature, with faster increase at temperatures higher than 910°C. The outgoing unburnt gases come from volatile matter that was not fully oxidized by ilmenite. Little CH4was measured and there were neither hydrocarbons heavier than CH4nor tars in the fuel-reactor outlet. At 870°C the char conversion was 15% and reached 82% at 950°C. The combustion efficiency in the fuel-reactor increased from 70% at 870°C to 95% at 950°C. The results show that ilmenite has good behavior as oxygen-carrier and that optimizing CLC with coal can lead to energy production with high CO2capture.