Combustion characteristics and NOX emissions of biogas fuels with various CO2 contents in a micro co-generation spark-ignition engine

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19 Citations (Scopus)

Abstract

Biogas is a renewable alternative fuel for internal combustion engines that has several advantages over conventional fuels, including lower costs and reduced levels of harmful emissions. In particular, it exhibits a neutral recirculation loop for carbon dioxide (CO2), which is one of the main causes of global warming. In this study, we investigated biogas fuels with various compositions using a micro co-generation engine system. The ratio of methane to CO2 and engine load were varied, and the intake air and fuel flow rates were controlled to change the equivalence ratio. The results show that for a given engine load, the ignition delay and combustion period increased with CO2 content, and the combustion speed decreased. The fuel consumption increased slightly with CO2 content; however, the thermal efficiency improved using a lean burn strategy, resulting in lower nitrogen oxide (NOX) emission, and moreover, the use of biogas with the stoichiometric air–fuel ratio appears effective in reducing NOX emissions and can improve the fuel economy at higher loads.

Original languageEnglish
Pages (from-to)539-547
Number of pages9
JournalApplied Energy
Volume182
DOIs
Publication statusPublished - Nov 15 2016

Fingerprint

cogeneration
Biogas
Nitrogen oxides
nitrogen oxides
Internal combustion engines
biogas
engine
combustion
Engines
Alternative fuels
Air intakes
Global warming
Fuel economy
Fuel consumption
alternative fuel
Ignition
Carbon dioxide
Methane
fuel consumption
Flow rate

Keywords

  • Biogas
  • Carbon dioxide
  • Lean burn
  • NOx reduction
  • SI combustion

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Energy(all)

Cite this

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title = "Combustion characteristics and NOX emissions of biogas fuels with various CO2 contents in a micro co-generation spark-ignition engine",
abstract = "Biogas is a renewable alternative fuel for internal combustion engines that has several advantages over conventional fuels, including lower costs and reduced levels of harmful emissions. In particular, it exhibits a neutral recirculation loop for carbon dioxide (CO2), which is one of the main causes of global warming. In this study, we investigated biogas fuels with various compositions using a micro co-generation engine system. The ratio of methane to CO2 and engine load were varied, and the intake air and fuel flow rates were controlled to change the equivalence ratio. The results show that for a given engine load, the ignition delay and combustion period increased with CO2 content, and the combustion speed decreased. The fuel consumption increased slightly with CO2 content; however, the thermal efficiency improved using a lean burn strategy, resulting in lower nitrogen oxide (NOX) emission, and moreover, the use of biogas with the stoichiometric air–fuel ratio appears effective in reducing NOX emissions and can improve the fuel economy at higher loads.",
keywords = "Biogas, Carbon dioxide, Lean burn, NOx reduction, SI combustion",
author = "Yungjin Kim and Nobuyuki Kawahara and Kazuya Tsuboi and Eiji Tomita",
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T1 - Combustion characteristics and NOX emissions of biogas fuels with various CO2 contents in a micro co-generation spark-ignition engine

AU - Kim, Yungjin

AU - Kawahara, Nobuyuki

AU - Tsuboi, Kazuya

AU - Tomita, Eiji

PY - 2016/11/15

Y1 - 2016/11/15

N2 - Biogas is a renewable alternative fuel for internal combustion engines that has several advantages over conventional fuels, including lower costs and reduced levels of harmful emissions. In particular, it exhibits a neutral recirculation loop for carbon dioxide (CO2), which is one of the main causes of global warming. In this study, we investigated biogas fuels with various compositions using a micro co-generation engine system. The ratio of methane to CO2 and engine load were varied, and the intake air and fuel flow rates were controlled to change the equivalence ratio. The results show that for a given engine load, the ignition delay and combustion period increased with CO2 content, and the combustion speed decreased. The fuel consumption increased slightly with CO2 content; however, the thermal efficiency improved using a lean burn strategy, resulting in lower nitrogen oxide (NOX) emission, and moreover, the use of biogas with the stoichiometric air–fuel ratio appears effective in reducing NOX emissions and can improve the fuel economy at higher loads.

AB - Biogas is a renewable alternative fuel for internal combustion engines that has several advantages over conventional fuels, including lower costs and reduced levels of harmful emissions. In particular, it exhibits a neutral recirculation loop for carbon dioxide (CO2), which is one of the main causes of global warming. In this study, we investigated biogas fuels with various compositions using a micro co-generation engine system. The ratio of methane to CO2 and engine load were varied, and the intake air and fuel flow rates were controlled to change the equivalence ratio. The results show that for a given engine load, the ignition delay and combustion period increased with CO2 content, and the combustion speed decreased. The fuel consumption increased slightly with CO2 content; however, the thermal efficiency improved using a lean burn strategy, resulting in lower nitrogen oxide (NOX) emission, and moreover, the use of biogas with the stoichiometric air–fuel ratio appears effective in reducing NOX emissions and can improve the fuel economy at higher loads.

KW - Biogas

KW - Carbon dioxide

KW - Lean burn

KW - NOx reduction

KW - SI combustion

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