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Effects of hydrogen addition on structure and NO formation of highly CO-Rich syngas counterflow nonpremixed flames under MILD combustion regime

The present study has numerically investigated the Moderate or Intense Low oxygen Dilution (MILD) combustion regime, combustion processes and NO formation characteristics of the highly CO-rich syngas counterflow nonpremixed flames. To realistically predict the flame properties of the highly CO-rich...

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Main Authors: Kim, Namsu, Kim, Yongmo, Mohd. Jaafar, Mohammad Nazri, Rahim, Muhammad Roslan, Said, Mazlan
Format: Article
Published: Elsevier Ltd 2021
Subjects:
TJ Mechanical engineering and machinery
Online Access:http://eprints.utm.my/id/eprint/95632/
http://dx.doi.org/10.1016/j.ijhydene.2020.12.120
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spelling my.utm.956322022-05-31T13:04:31Z http://eprints.utm.my/id/eprint/95632/ Effects of hydrogen addition on structure and NO formation of highly CO-Rich syngas counterflow nonpremixed flames under MILD combustion regime Kim, Namsu Kim, Yongmo Mohd. Jaafar, Mohammad Nazri Rahim, Muhammad Roslan Said, Mazlan TJ Mechanical engineering and machinery The present study has numerically investigated the Moderate or Intense Low oxygen Dilution (MILD) combustion regime, combustion processes and NO formation characteristics of the highly CO-rich syngas counterflow nonpremixed flames. To realistically predict the flame properties of the highly CO-rich syngas, the chemistry is represented by the modified GRI 3.0 mechanism. Computations are performed to precisely analyze the flame structure, NO formation rate, and EINO of each NO sub-mechanism. Numerical results reveal that the hydrogen enrichment and oxygen augmentation substantially influence the NO emission characteristics and the dominant NO production route in the CO-rich syngas nonpremixed flames under MILD and high temperature combustion regimes. It is found that the most dominant NO production routes are the NNH path for the lowest oxygen level (3%) and the thermal mechanism for the highest O2 condition (21%). For the intermediate oxygen level (9%), the most dominant NO production routes are the NNH route for the hydrogen fraction up to 5%, the CO2 path for the hydrogen fraction range from 5% to 10% and the thermal mechanism for the hydrogen fraction higher than 10%, respectively. To evaluate the contribution of the specific reaction on EINO the sensitivity coefficients are precisely analyzed for NO formation processes with the dominance of NNH/CO2/Thermal mechanism under the highly CO-rich syngas flames. Elsevier Ltd 2021-03-08 Article PeerReviewed Kim, Namsu and Kim, Yongmo and Mohd. Jaafar, Mohammad Nazri and Rahim, Muhammad Roslan and Said, Mazlan (2021) Effects of hydrogen addition on structure and NO formation of highly CO-Rich syngas counterflow nonpremixed flames under MILD combustion regime. International Journal of Hydrogen Energy, 46 (17). pp. 10518-10534. ISSN 0360-3199 http://dx.doi.org/10.1016/j.ijhydene.2020.12.120 DOI:10.1016/j.ijhydene.2020.12.120
institution Universiti Teknologi Malaysia
building UTM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Malaysia
content_source UTM Institutional Repository
url_provider http://eprints.utm.my/
topic TJ Mechanical engineering and machinery
spellingShingle TJ Mechanical engineering and machinery
Kim, Namsu
Kim, Yongmo
Mohd. Jaafar, Mohammad Nazri
Rahim, Muhammad Roslan
Said, Mazlan
Effects of hydrogen addition on structure and NO formation of highly CO-Rich syngas counterflow nonpremixed flames under MILD combustion regime
description The present study has numerically investigated the Moderate or Intense Low oxygen Dilution (MILD) combustion regime, combustion processes and NO formation characteristics of the highly CO-rich syngas counterflow nonpremixed flames. To realistically predict the flame properties of the highly CO-rich syngas, the chemistry is represented by the modified GRI 3.0 mechanism. Computations are performed to precisely analyze the flame structure, NO formation rate, and EINO of each NO sub-mechanism. Numerical results reveal that the hydrogen enrichment and oxygen augmentation substantially influence the NO emission characteristics and the dominant NO production route in the CO-rich syngas nonpremixed flames under MILD and high temperature combustion regimes. It is found that the most dominant NO production routes are the NNH path for the lowest oxygen level (3%) and the thermal mechanism for the highest O2 condition (21%). For the intermediate oxygen level (9%), the most dominant NO production routes are the NNH route for the hydrogen fraction up to 5%, the CO2 path for the hydrogen fraction range from 5% to 10% and the thermal mechanism for the hydrogen fraction higher than 10%, respectively. To evaluate the contribution of the specific reaction on EINO the sensitivity coefficients are precisely analyzed for NO formation processes with the dominance of NNH/CO2/Thermal mechanism under the highly CO-rich syngas flames.
format Article
author Kim, Namsu
Kim, Yongmo
Mohd. Jaafar, Mohammad Nazri
Rahim, Muhammad Roslan
Said, Mazlan
author_facet Kim, Namsu
Kim, Yongmo
Mohd. Jaafar, Mohammad Nazri
Rahim, Muhammad Roslan
Said, Mazlan
author_sort Kim, Namsu
title Effects of hydrogen addition on structure and NO formation of highly CO-Rich syngas counterflow nonpremixed flames under MILD combustion regime
title_short Effects of hydrogen addition on structure and NO formation of highly CO-Rich syngas counterflow nonpremixed flames under MILD combustion regime
title_full Effects of hydrogen addition on structure and NO formation of highly CO-Rich syngas counterflow nonpremixed flames under MILD combustion regime
title_fullStr Effects of hydrogen addition on structure and NO formation of highly CO-Rich syngas counterflow nonpremixed flames under MILD combustion regime
title_full_unstemmed Effects of hydrogen addition on structure and NO formation of highly CO-Rich syngas counterflow nonpremixed flames under MILD combustion regime
title_sort effects of hydrogen addition on structure and no formation of highly co-rich syngas counterflow nonpremixed flames under mild combustion regime
publisher Elsevier Ltd
publishDate 2021
url http://eprints.utm.my/id/eprint/95632/
http://dx.doi.org/10.1016/j.ijhydene.2020.12.120
_version_ 1735386828173737984
score 13.211869

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