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Research Papers: Fuel Combustion

Thermodynamic Analysis on Reaction Characteristics of the Coupling Steam, CO2 and O2 Reforming of Methane

[+] Author and Article Information
Yunfei Yan

Key Laboratory of Low-grade Energy
Utilization Technologies and Systems,
Chongqing University,
Ministry of Education,
Chongqing 400030, China
e-mail: yunfeiyan@cqu.edu.cn

Hongyu Yan, Li Zhang, Zhongqing Yang

Key Laboratory of Low-grade Energy
Utilization Technologies and Systems,
Chongqing University,
Ministry of Education,
Chongqing 400030, China

Lixian Li

Chongqing University Cancer Hospital,
Chongqing Cancer Institute,
Chongqing Cancer Hospital,
Chongqing 400030, China
e-mail: lilixian2010@yahoo.com

1Corresponding authors.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received October 27, 2017; final manuscript received April 20, 2018; published online May 15, 2018. Assoc. Editor: Reza Sheikhi.

J. Energy Resour. Technol 140(10), 102203 (May 15, 2018) (8 pages) Paper No: JERT-17-1595; doi: 10.1115/1.4040074 History: Received October 27, 2017; Revised April 20, 2018

This study presents an analysis of coupling steam, CO2 and O2 reforming of CH4 using the thermodynamic equilibrium constant method. Effects of molar ratio of O2/CH4, H2O/CH4 and CO2/CH4 on reforming characteristics in both carbon deposition and carbon-free systems are analyzed. The results indicate that CH4 conversion rate, H2, and CO yield increase with increasing O2/CH4 molar ratio in two systems. In addition, the carbon elimination is achieved when O2/CH4 ratio increases to 0.31, and changing the amount of O2 can be an effective way to alter n(H2)/n(CO) ratio in the carbon deposition systems. CH4 conversion rate increases with increasing H2O/CH4 ratio in the carbon-free system, while it declines in the carbon deposition system. H2O plays a role of altering n(H2)/n(CO) ratio, and its effects on two systems are opposite. The deposited carbon is totally eliminated when H2O/CH4 ratio increases to 0.645. The increase of CO2/CH4 molar ratio leads to a rapid increase of CO2 conversion when CO2/CH4 ratio is less than 0.5. A slightly change of CO2/CH4 ratio can result in a huge difference on n(H2)/n(CO) ratio in both systems, and carbon elimination is achieved at CO2/CH4 = 0.99. The analyzed results have theoretical significance to efficiently catalyze methane coupling.

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Figures

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Fig. 1

Comparison between calculation results and experimental data for methane conversion at different temperatures

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Fig. 2

Influence of α on CH4 and CO2 conversions and the amount of H2O for carbon deposition system and carbon-free system

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Fig. 3

Influence of α on H2 and CO yields and the amount of carbon for carbon deposition system and/or carbon-free system

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Fig. 4

Comparison of H2 and CO productions and n(H2)/n(CO) ratio for carbon deposition system and carbon-free system at different α

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Fig. 5

Influence of β on CH4 and CO2 conversions and the amount of H2O for carbon deposition system and carbon-free system

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Fig. 6

Influence of β on H2 and CO yields and the amount of carbon for carbon deposition system and/or carbon-free system

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Fig. 7

Comparison of H2 and CO productions and n(H2)/n(CO) ratio for carbon deposition system and carbon-free system at different β

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Fig. 8

Influence of γ on CH4 and CO2 conversions and the amount of H2O for carbon deposition system and carbon-free system

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Fig. 9

Influence of γ on H2 and CO yields and the amount of carbon for carbon deposition system and/or carbon-free system

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Fig. 10

Comparison of H2 and CO productions and n(H2)/n(CO) ratio for carbon deposition system and carbon-free system at different γ

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