Syngas chemical looping gasification process: Bench-scale studies and reactor simulations

• Published in: AIChE journal Vol. 56; no. 8; pp. 2186 - 2199
• Main Authors: Li, Fanxing, Zeng, Liang, Velazquez-Vargas, Luis G, Yoscovits, Zachary, Fan, Liang-Shih
• Format: Journal Article
• Language: English
• Published: Hoboken Wiley Subscription Services, Inc., A Wiley Company 01.08.2010; Wiley; American Institute of Chemical Engineers
• Subjects: Applied sciences; Carriers; Chemical engineering; chemical looping; Chemical reactors; coal; Computer simulation; Conversion; electricity; Exact sciences and technology; Fluidization; Fluidizing; Gasification; hydrogen; Hydrogen reduction; Iron oxides; moving bed; Oxygen; Reactors; Simulation; Synthesis gas; Thermodynamics; Moving bed; chemical looping; electricity; Fluidization; hydrogen; Countercurrent flow; Synthesis gas; Modeling; Coal; Moving bed reactor; Thermodynamic analysis; Gasification; Fluidized bed
• ISSN: 0001-1541; 1547-5905
• DOI: 10.1002/aic.12093

The syngas chemical looping process co-produces hydrogen and electricity from syngas through the cyclic reduction and regeneration of an iron oxide based oxygen carrier. In this article, the reducer, which reduces the oxygen carrier with syngas, is investigated through thermodynamic analysis, experiments, and ASPEN Plus® simulation. The thermodynamic analysis indicates that the countercurrent moving-bed reducer offers better gas and solids conversions when compared to the fluidized-bed reducer. The reducer is continuously operated for 15 h in a bench scale moving-bed reactor. A syngas conversion in excess of 99.5% and an oxygen carrier conversion of nearly 50% are obtained. An ASPEN Plus® model is developed which simulates the reducer performance. The results of simulation are consistent with those obtained from both the thermodynamic analysis and experiments. Both the experiments and simulation indicate that the proposed SCL reducer concept is feasible. © 2009 American Institute of Chemical Engineers AIChE J, 2010