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Energies 2017, 10(8), 1200; https://doi.org/10.3390/en10081200

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

1
Department of Chemical Engineering, Nagoya University, Nagoya, Aichi 464-8603, Japan
2
Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
3
Faculty of Mechanical Engineering, Kanazawa University, Kakuma, Kanazawa, Ishikawa 920-1192, Japan
*
Authors to whom correspondence should be addressed.
Received: 10 May 2017 / Revised: 5 July 2017 / Accepted: 20 July 2017 / Published: 13 August 2017
(This article belongs to the Collection Bioenergy and Biofuel)
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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. View Full-Text
Keywords: biogas; heat release; methane content; hydrogen addition; oxygen enriched biogas; heat release; methane content; hydrogen addition; oxygen enriched
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Li, J.; Huang, H.; Huhetaoli; Osaka, Y.; Bai, Y.; Kobayashi, N.; Chen, Y. Combustion and Heat Release Characteristics of Biogas under Hydrogen- and Oxygen-Enriched Condition. Energies 2017, 10, 1200.

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