Syngas Chemical Looping Gasification Process: Oxygen Carrier Particle Selection and Performance

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• 作者：Fanxing Li ; Hyung Ray Kim ; Deepak Sridhar ; Fei Wang ; Liang Zeng ; Joseph Chen ; L.-S. Fan
• 刊名：Energy & Fuels
• 出版年：2009
• 出版时间：August 20, 2009
• 年：2009
• 卷：23
• 期：8
• 页码：4182-4189
• 全文大小：313K
• 年卷期：v.23,no.8(August 20, 2009)
• ISSN：1520-5029

文摘

The syngas chemical looping (SCL) process coproduces hydrogen and electricity. The process involves reducing metal oxides with syngas followed by regeneration of reduced metal oxides with steam and air in a cyclic manner. Iron oxide is determined to be a desired oxygen carrier for hydrogen production considering overall properties including oxygen carrying capacity, thermodynamic properties, reaction kinetics, physical strength, melting points, and environmental effects. An iron oxide based particle can maintain good reactivity for more than 100 reduction−oxidation (redox) cycles in a thermogravimetric analyzer (TGA). The particle exhibits a good crushing strength (>20 MPa) and low attrition rate. Fixed bed experiments are carried out which reaffirm its reactivity. More than 99.75% of syngas is converted during the reduction stage. During the regeneration stage, hydrogen with an average purity of 99.8% is produced.