Pressurized Chemical-Looping Combustion of Chinese Bituminous Coal: Cyclic Performance and Characterization of Iron Ore-Based Oxygen Carrier
Pressurized Chemical-Looping Combustion of Chinese Bituminous Coal: Cyclic Performance and Characterization of Iron Ore-Based Oxygen Carrier
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DOI：
10.1021/ef901070c
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发表时间：
2010-02
期刊：
影响因子：
5.3
通讯作者：
R. Xiao;Qilei Song;Shuai Zhang;Wenguang Zheng;Yichao Yang
中科院分区：
文献类型：
--
作者：
R. Xiao;Qilei Song;Shuai Zhang;Wenguang Zheng;Yichao Yang
提出了一种加压化学链燃烧联合循环（PCLC）系统用于固体燃料燃烧，该系统具有潜在的高系统效率，可提高燃料转化率并降低二氧化碳封存成本。在本研究中，在实验室固定床反应器中对使用淡水河谷（CVRD）铁矿石的煤加压化学链燃烧进行了研究，重点关注循环性能。CVRD铁矿石颗粒交替进行20个循环，在大气压（0.1 MPa）和典型的0.5 MPa高压下，于970°C分别用0.4克中国徐州烟煤（与87%的蒸汽/氮气混合物气化）进行还原以及用氮气中5%的氧气进行氧化。随着氧化还原循环次数的增加，更多的热解气体被氧载体氧化。在高压下，炭的气化作用增强，释放出的气化中间产物可忽略不计。在大气压下经过10个循环后，二氧化碳的比例从80%增加到约90%。在高压下，平均二氧化碳……
A pressurized chemical-looping combustion combined cycle (PCLC) system is proposed for solid fuels combustion with potential high system efficiency, improving the fuel conversion and lowering the cost for CO2 sequestration. In this study, pressurized CLC of coal with Companhia Valedo Rio Doce (CVRD) iron ore was investigated in a laboratory fixed bed reactor focusing on cyclic performance. CVRD iron ore particles were exposed alternately for 20 cycles to reduction by 0.4 g of Chinese Xuzhou bituminous coal gasified with 87% steam/N2 mixture and oxidation with 5% O2 in N2 at 970 °C at atmospheric pressure (0.1 MPa) and a typical elevated pressure of 0.5 MPa. With increasing number of redox cycles, more pyrolysis gases are oxidized by the oxygen carrier. At elevated pressure, the char gasification is intensified with negligible gasification intermediate products released. The CO2 fraction increases from 80% to approximate 90% after 10 cycles at atmospheric pressure. At elevated pressures, the average CO2 fr...