Demonstration of chemical-looping with oxygen uncoupling (CLOU) process in a 1.5 kWth continuously operating unit using a Cu-based oxygen-carrier
Demonstration of chemical-looping with oxygen uncoupling (CLOU) process in a 1.5 kWth continuously operating unit using a Cu-based oxygen-carrier
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DOI：
10.1016/j.ijggc.2011.10.016
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发表时间：
2012-01-01
影响因子：
3.9
通讯作者：
Adanez, Juan
中科院分区：
文献类型：
--
作者：
Abad, Alberto;Adanez-Rubio, Inaki;Adanez, Juan
化学链与氧解偶联（CLOU）工艺是一种化学链燃烧（CLC）技术，允许固体燃料燃烧并固有地分离CO2。与CLC技术一样，在CLOU工艺中，燃料燃烧所需的氧气由含有金属氧化物的固体氧载体提供。CLOU技术利用了氧化铜在高温下可以产生气态氧的特性。由氧载体产生的氧直接与固体燃料反应，固体燃料在燃料反应器中与氧载体混合。还原的氧载体被输送到空气反应器，在那里它被空气氧化。由于燃料不与空气混合，因此来自燃料反应器的烟道气仅为CO2和H2O。这项工作证明了CLOU技术在1.5 kW（th）连续运行的由两个相互连接的流化床反应器组成的单元中燃烧煤炭的概念。烟煤被用作燃料。通过喷雾干燥制备的氧载体，其包含60重量%以CuO和MgAl_2O_4为载体材料，制备了载氧体。燃料反应器的温度，煤的进料速率，和固体循环流量的燃烧和CO2捕集效率的影响进行了研究。使用载氧体观察到快速的氧气生成反应速率，并且在燃料反应器中使用约235 kg/MWth的固体库存，工厂实现了煤炭的充分燃烧。此外，在960摄氏度下获得了接近100%的碳捕获效率值。所得结果进行了分析和讨论，以便是有用的，以煤为燃料的CLOU过程的放大。(C)2011爱思唯尔有限公司保留所有权利。
Chemical-looping with oxygen uncoupling (CLOU) process is a chemical-looping combustion (CLC) technology that allows the combustion of solid fuels with inherent CO2 separation. As in the CLC technology, in the CLOU process the oxygen necessary for the fuel combustion is supplied by a solid oxygen-carrier, which contains a metal oxide. The CLOU technology uses the property of the copper oxide which can generate gaseous oxygen at high temperatures. The oxygen generated by the oxygen-carrier reacts directly with the solid fuel, which is mixed with the oxygen-carrier in the fuel-reactor. The reduced oxygen-carrier is transported to the air-reactor where it is oxidized by air. The flue gases from the fuel-reactor are only CO2 and H2O, since fuel is not mixed with air. This work demonstrates the proof of the concept of the CLOU technology burning coal in a 1.5 kW(th) continuously operated unit consisting of two interconnected fluidized-bed reactors. A bituminous coal was used as fuel. An oxygen-carrier prepared by spray drying containing 60 wt.% CuO and MgAl2O4 as supporting material was used as oxygen-carrier. The effects of fuel-reactor temperature, coal feeding rate, and solids circulation flow rate on the combustion and on the CO2 capture efficiencies were investigated. Fast reaction rates of oxygen generation were observed with the oxygen-carrier and full combustion of coal was attained in the plant using a solids inventory approximate to 235 kg/MWth in the fuel-reactor. In addition, values close to 100% in carbon capture efficiency were obtained at 960 degrees C. Results obtained are analyzed and discussed in order to be useful for the scale-up of a CLOU process fuelled with coal. (C) 2011 Elsevier Ltd. All rights reserved.