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Numerical Study on the Autoignition of Biogas in Moderate or Intense Low Oxygen Dilution Nonpremixed Combustion Systems

The ignition delay of biogas in mixing layers is investigated using a one-dimensional combustion model, with its application in Moderate or Intense Low oxygen Dilution (MILD) combustion being the focus. The current study reveals the key aspects of the ignition of biogas in a nonpremixed, igniting mi...

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Autores principales: Vasavan, Aromal, de Goey, Philip, van Oijen, Jeroen
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2018
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6105038/
https://www.ncbi.nlm.nih.gov/pubmed/30147233
http://dx.doi.org/10.1021/acs.energyfuels.8b01388
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author Vasavan, Aromal
de Goey, Philip
van Oijen, Jeroen
author_facet Vasavan, Aromal
de Goey, Philip
van Oijen, Jeroen
author_sort Vasavan, Aromal
collection PubMed
description The ignition delay of biogas in mixing layers is investigated using a one-dimensional combustion model, with its application in Moderate or Intense Low oxygen Dilution (MILD) combustion being the focus. The current study reveals the key aspects of the ignition of biogas in a nonpremixed, igniting mixing layer with a hot oxidizer of low oxygen content. The observed characteristics are contrasted against the existing studies on ignition in homogeneous mixtures under similar conditions. Biogas is considered here as a mixture of CH(4) with variable amounts CO(2). The influence of reactive, thermal, and transport properties of CO(2) on the ignition is evaluated using artificial species to mimic the respective characteristics of CO(2). While the ignition delay in homogeneous mixtures shows a strong dependence on CO(2) content in the fuel, the ignition delay predictions from one-dimensional mixing layers show no significant influence of CO(2) levels in biogas. In addition, the influence of oxidizer composition and temperature on ignition delay is determined for CO(2) levels ranging from 0% to 90%. A sensitivity analysis of chemical reactions on the ignition delay shows a negligible effect of CO(2) concentration in biogas. The current study emphasizes the role of oxidizer composition and temperature on the ignition characteristics of a MILD biogas flame.
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spelling pubmed-61050382018-08-23 Numerical Study on the Autoignition of Biogas in Moderate or Intense Low Oxygen Dilution Nonpremixed Combustion Systems Vasavan, Aromal de Goey, Philip van Oijen, Jeroen Energy Fuels The ignition delay of biogas in mixing layers is investigated using a one-dimensional combustion model, with its application in Moderate or Intense Low oxygen Dilution (MILD) combustion being the focus. The current study reveals the key aspects of the ignition of biogas in a nonpremixed, igniting mixing layer with a hot oxidizer of low oxygen content. The observed characteristics are contrasted against the existing studies on ignition in homogeneous mixtures under similar conditions. Biogas is considered here as a mixture of CH(4) with variable amounts CO(2). The influence of reactive, thermal, and transport properties of CO(2) on the ignition is evaluated using artificial species to mimic the respective characteristics of CO(2). While the ignition delay in homogeneous mixtures shows a strong dependence on CO(2) content in the fuel, the ignition delay predictions from one-dimensional mixing layers show no significant influence of CO(2) levels in biogas. In addition, the influence of oxidizer composition and temperature on ignition delay is determined for CO(2) levels ranging from 0% to 90%. A sensitivity analysis of chemical reactions on the ignition delay shows a negligible effect of CO(2) concentration in biogas. The current study emphasizes the role of oxidizer composition and temperature on the ignition characteristics of a MILD biogas flame. American Chemical Society 2018-07-21 2018-08-16 /pmc/articles/PMC6105038/ /pubmed/30147233 http://dx.doi.org/10.1021/acs.energyfuels.8b01388 Text en Copyright © 2018 American Chemical Society This is an open access article published under a Creative Commons Non-Commercial No Derivative Works (CC-BY-NC-ND) Attribution License (http://pubs.acs.org/page/policy/authorchoice_ccbyncnd_termsofuse.html) , which permits copying and redistribution of the article, and creation of adaptations, all for non-commercial purposes.
spellingShingle Vasavan, Aromal
de Goey, Philip
van Oijen, Jeroen
Numerical Study on the Autoignition of Biogas in Moderate or Intense Low Oxygen Dilution Nonpremixed Combustion Systems
title Numerical Study on the Autoignition of Biogas in Moderate or Intense Low Oxygen Dilution Nonpremixed Combustion Systems
title_full Numerical Study on the Autoignition of Biogas in Moderate or Intense Low Oxygen Dilution Nonpremixed Combustion Systems
title_fullStr Numerical Study on the Autoignition of Biogas in Moderate or Intense Low Oxygen Dilution Nonpremixed Combustion Systems
title_full_unstemmed Numerical Study on the Autoignition of Biogas in Moderate or Intense Low Oxygen Dilution Nonpremixed Combustion Systems
title_short Numerical Study on the Autoignition of Biogas in Moderate or Intense Low Oxygen Dilution Nonpremixed Combustion Systems
title_sort numerical study on the autoignition of biogas in moderate or intense low oxygen dilution nonpremixed combustion systems
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6105038/
https://www.ncbi.nlm.nih.gov/pubmed/30147233
http://dx.doi.org/10.1021/acs.energyfuels.8b01388
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