Operation of a 10 kWth chemical-looping combustor during 200 h with a CuO-Al2O3 oxygen carrier
Operation of a 10 kWth chemical-looping combustor during 200 h with a CuO-Al2O3 oxygen carrier
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DOI：
10.1016/j.fuel.2006.10.004
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发表时间：
2007-05
期刊：
影响因子：
7.4
通讯作者：
L. F. D. Diego;Francisco Garcı´a-Labiano;P. Gayán;J. Celaya;J. Palacios;J. Adánez
中科院分区：
文献类型：
--
作者：
L. F. D. Diego;Francisco Garcı´a-Labiano;P. Gayán;J. Celaya;J. Palacios;J. Adánez
化学链燃烧（CLC）是一种具有潜在应用前景的温室气体减排技术，其特点是燃烧过程本身具有CO2分离功能，不需要额外的CO2分离设备，能耗低。CLC概念基于将气体燃料的常规燃烧分成单独的还原和氧化反应。从空气到燃料的氧转移是通过在两个相互连接的反应器之间循环的金属氧化物形式的氧载体来实现的。以γ-Al 2 O3为载体，采用浸渍法制备了两种不同粒径（0.1-0.3mm和0.2-0.5mm）的Cu基材料（Cu 14 Al），并将其作为甲烷化学链燃烧的氧载体。设计了一个由两个相互连接的鼓泡流化床反应器组成的10 kWth CLC原型，并在800°C下对每种粒径运行100小时。在还原阶段，使用氧载体与燃料的比率高于1.5，实现了CH 4到CO2和H2O的完全转化。在操作的前50小时期间检测到作为CLC过程的活性相的一些CuO损失，这主要是由于存在于氧化铝颗粒的外表面中的CuO的侵蚀。在整个测试期间保持的氧载体的高反应性、在100小时操作后检测到的低磨损速率以及不存在任何附聚问题揭示了这些CuO基材料在CLC工艺中作为氧载体的良好性能。
Chemical-looping combustion (CLC) is an attractive technology to decrease greenhouse gas emissions affecting global warming, because it is a combustion process with inherent CO2separation and therefore without needing extra equipment for CO2separation and low penalty in energy demand. The CLC concept is based on the split of a conventional combustion of gas fuel into separate reduction and oxidation reactions. The oxygen transfer from air to fuel is accomplished by means of an oxygen carrier in the form of a metal oxide circulating between two interconnected reactors. A Cu-based material (Cu14Al) prepared by impregnation of γ-Al2O3as support with two different particle sizes (0.1–0.3mm, 0.2–0.5mm) was used as an oxygen carrier for a chemical-looping combustion of methane. A 10kWth CLC prototype composed of two interconnected bubbling fluidized bed reactors has been designed, built in and operated at 800°C during 100h for each particle size. In the reduction stage full conversion of CH4to CO2and H2O was achieved using oxygen carrier-to-fuel ratios above 1.5. Some CuO losses as the active phase of the CLC process were detected during the first 50h of operation, mainly due to the erosion of the CuO present in external surface of the alumina particles. The high reactivity of the oxygen carrier maintained during the whole test, the low attrition rate detected after 100h of operation, and the absence of any agglomeration problem revealed a good performance of these CuO-based materials as oxygen carriers in a CLC process.