Coal Chemical Looping Gasification for Syngas Generation Using an Iron-Based Oxygen Carrier

被引:123
作者
Guo, Qingjie [1 ]
Cheng, Yu [1 ]
Liu, Yongzhuo [1 ]
Jia, Weihua [1 ]
Ryu, Ho-Jung [2 ]
机构
[1] Qingdao Univ Sci & Technol, Key Lab Clean Chem Proc Engn Univ Shandong Prov, Qingdao 266042, Shandong, Peoples R China
[2] Korea Inst Energy Res, Climate Change Technol Res Div, Taejon 305343, South Korea
关键词
SOLID FUELS; COMBUSTION; OXIDE; REDUCTION; GAS;
D O I
10.1021/ie401568x
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
The chemical-looping gasification (CLG) of coal is a clean and effective technology for syngas generation. Sharing principles with chemical-looping combustion (CLC), CLG also uses oxygen carriers to transfer lattice oxygen to the fuel. Investigations into CLG with different O/C ratios are carried out in a fluidized bed reactor with steam used as the gasification- fluidization medium. The effect of the active component content of the oxygen carrier on the gas selectivity is performed, and reaction mechanisms between the Fe2O3 oxygen carrier and coal with steam as the gasification agent are discussed. Moreover, we also assessed the reactivity of the CaO-decorated iron-based oxygen carrier particles in multicycle reactions. The carbon conversion efficiency is increased from 55.74 to 81% with increasing O/C ratio, whereas the content of H-2 first decreases and then increases. The addition of CaO can increase the carbon conversion efficiency and the gasification rate substantially and reduce the generation rate of H2S from 1.89 x 10(-3) to 0.156 x 10(-3) min(-1). Furthermore, X-ray diffraction (XRD) images indicate that the CaO-decorated iron-based oxygen carrier particles were completely regenerated after six redox cycles. Finally, the peak fitting of gasification reaction rate curves is used to explore the reaction mechanism between coal char and the CaO-decorated iron-based oxygen carrier, indicating that the reactions in the CLG include three stages: the complex reactions involved an oxygen carrier, coal char, and steam; the gasification of coal char; and the reduction of Fe3O4 to FeO. The two-segment modified random pore model (MRPM) fits the experiment data well.
引用
收藏
页码:78 / 86
页数:9
相关论文
共 23 条
[1]   The use of iron oxide as oxygen carrier in a chemical-looping reactor [J].
Abad, A. ;
Mattisson, T. ;
Lyngfelt, A. ;
Johansson, M. .
FUEL, 2007, 86 (7-8) :1021-1035
[2]   Mapping of the range of operational conditions for Cu-, Fe-, and Ni-based oxygen carriers in chemical-looping combustion [J].
Abad, Alberto ;
Adanez, Juan ;
Garcia-Labiano, Francisco ;
de Diego, Luis F. ;
Gayan, Pilar ;
Celaya, Javier .
CHEMICAL ENGINEERING SCIENCE, 2007, 62 (1-2) :533-549
[3]   Progress in Chemical-Looping Combustion and Reforming technologies [J].
Adanez, Juan ;
Abad, Alberto ;
Garcia-Labiano, Francisco ;
Gayan, Pilar ;
de Diego, Luis F. .
PROGRESS IN ENERGY AND COMBUSTION SCIENCE, 2012, 38 (02) :215-282
[4]  
Andrus H, 2009, 34 INT TECHN C CLEAN
[5]   Investigation of chemical looping combustion by solid fuels. 1. Process analysis [J].
Cao, Yan ;
Pan, Wei-Ping .
ENERGY & FUELS, 2006, 20 (05) :1836-1844
[6]   Investigation of chemical looping combustion by solid fuels. 2. Redox reaction kinetics and product characterization with coal, biomass, and solid waste as solid fuels and CuO as an oxygen carrier [J].
Cao, Yan ;
Casenas, Bianca ;
Pan, Wei-Ping .
ENERGY & FUELS, 2006, 20 (05) :1845-1854
[7]   Synthesis gas generation by chemical-looping reforming in a batch fluidized bed reactor using Ni-based oxygen carriers [J].
de Diego, Luis F. ;
Ortiz, Maria ;
Adanez, Juan ;
Garcia-Labiano, Francisco ;
Abad, Alberto ;
Gayan, Pilar .
CHEMICAL ENGINEERING JOURNAL, 2008, 144 (02) :289-298
[8]   TUBULAR REFORMING AND AUTOTHERMAL REFORMING OF NATURAL-GAS - AN OVERVIEW OF AVAILABLE PROCESSES [J].
DYBKJAER, I .
FUEL PROCESSING TECHNOLOGY, 1995, 42 (2-3) :85-107
[9]   THE CHEMISTRY OF METHANE REFORMING WITH CARBON-DIOXIDE AND ITS CURRENT AND POTENTIAL APPLICATIONS [J].
EDWARDS, JH ;
MAITRA, AM .
FUEL PROCESSING TECHNOLOGY, 1995, 42 (2-3) :269-289
[10]   Hydrogen production from coal using coal direct chemical looping and syngas chemical looping combustion systems: Assessment of system operation and resource requirements [J].
Gnanapragasam, N. V. ;
Reddy, B. V. ;
Rosen, M. A. .
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 2009, 34 (06) :2606-2615