Combustion and Heat Release Characteristics of Biogas under Hydrogen- and Oxygen-Enriched Condition
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 a...
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doaj-4e05736f8da84177b444f1cb6f62f0392020-11-25T02:28:58ZengMDPI AGEnergies1996-10732017-08-01108120010.3390/en10081200en10081200Combustion and Heat Release Characteristics of Biogas under Hydrogen- and Oxygen-Enriched ConditionJun Li0Hongyu Huang1Huhetaoli2Yugo Osaka3Yu Bai4Noriyuki Kobayashi5Yong Chen6Department of Chemical Engineering, Nagoya University, Nagoya, Aichi 464-8603, JapanGuangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, ChinaGuangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, ChinaFaculty of Mechanical Engineering, Kanazawa University, Kakuma, Kanazawa, Ishikawa 920-1192, JapanGuangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, ChinaDepartment of Chemical Engineering, Nagoya University, Nagoya, Aichi 464-8603, JapanGuangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, ChinaCombustion 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.https://www.mdpi.com/1996-1073/10/8/1200biogasheat releasemethane contenthydrogen additionoxygen enriched |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Jun Li Hongyu Huang Huhetaoli Yugo Osaka Yu Bai Noriyuki Kobayashi Yong Chen |
spellingShingle |
Jun Li Hongyu Huang Huhetaoli Yugo Osaka Yu Bai Noriyuki Kobayashi Yong Chen Combustion and Heat Release Characteristics of Biogas under Hydrogen- and Oxygen-Enriched Condition Energies biogas heat release methane content hydrogen addition oxygen enriched |
author_facet |
Jun Li Hongyu Huang Huhetaoli Yugo Osaka Yu Bai Noriyuki Kobayashi Yong Chen |
author_sort |
Jun Li |
title |
Combustion and Heat Release Characteristics of Biogas under Hydrogen- and Oxygen-Enriched Condition |
title_short |
Combustion and Heat Release Characteristics of Biogas under Hydrogen- and Oxygen-Enriched Condition |
title_full |
Combustion and Heat Release Characteristics of Biogas under Hydrogen- and Oxygen-Enriched Condition |
title_fullStr |
Combustion and Heat Release Characteristics of Biogas under Hydrogen- and Oxygen-Enriched Condition |
title_full_unstemmed |
Combustion and Heat Release Characteristics of Biogas under Hydrogen- and Oxygen-Enriched Condition |
title_sort |
combustion and heat release characteristics of biogas under hydrogen- and oxygen-enriched condition |
publisher |
MDPI AG |
series |
Energies |
issn |
1996-1073 |
publishDate |
2017-08-01 |
description |
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. |
topic |
biogas heat release methane content hydrogen addition oxygen enriched |
url |
https://www.mdpi.com/1996-1073/10/8/1200 |
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