Combustion and Heat Release Characteristics of Biogas under Hydrogen- and Oxygen-Enriched Condition

Jun Li, Hongyu Huang, Huhetaoli, Yugo Osaka, Yu Bai, Noriyuki Kobayashi and Yong Chen
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Jun Li: Department of Chemical Engineering, Nagoya University, Nagoya, Aichi 464-8603, Japan
Hongyu Huang: Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
Huhetaoli: Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
Yugo Osaka: Faculty of Mechanical Engineering, Kanazawa University, Kakuma, Kanazawa, Ishikawa 920-1192, Japan
Yu Bai: Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
Noriyuki Kobayashi: Department of Chemical Engineering, Nagoya University, Nagoya, Aichi 464-8603, Japan
Yong Chen: Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China

Energies, 2017, vol. 10, issue 8, 1-11

Abstract: Combustion and heat release characteristics of biogas non-premixed flames under various hydrogen-enriched and oxygen-enriched conditions were investigated through chemical kinetics simulation using detailed chemical mechanisms. The heat release rates, chemical reaction rates, and molar fraction of all species of biogas at various methane contents (35.3–58.7%, mass fraction), hydrogen addition ratios (10–50%), and oxygen enrichment levels (21–35%) were calculated considering the GRI 3.0 mechanism and P1 radiation model. Results showed that the net reaction rate of biogas increases with increasing hydrogen addition ratio and oxygen levels, leading to a higher net heat release rate of biogas flame. Meanwhile, flame length was shortened with the increase in hydrogen addition ratio and oxygen levels. The formation of free radicals, such as H, O, and OH, are enhanced with increase in hydrogen addition ratio and oxygen levels. Higher reaction rates of exothermic elementary reactions, especially those with OH free radical are increased, are beneficial to the improvement in combustion and heat release characteristics of biogas in practical applications.

Keywords: biogas; heat release; methane content; hydrogen addition; oxygen enriched (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (5)

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