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Effect of Ammonia on Laminar Combustion Characteristics of Methane–Air Flames at Elevated Pressures
[Image: see text] In this paper, laminar combustion characteristics of methane/ammonia/air flames are numerically investigated using the Chemkin/Premix code. The initial temperature is set as 298 K; the initial pressures are set as 1, 2, 5, 10, and 20 atm; and the equivalence ratios are set as 0.8–1...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Chemical Society
2022
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9096957/ https://www.ncbi.nlm.nih.gov/pubmed/35571814 http://dx.doi.org/10.1021/acsomega.1c05938 |
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author | Jin, Tao Dong, Wenlong Qiu, Bingbing Xu, Cangsu Liu, Ya Chu, Huaqiang |
author_facet | Jin, Tao Dong, Wenlong Qiu, Bingbing Xu, Cangsu Liu, Ya Chu, Huaqiang |
author_sort | Jin, Tao |
collection | PubMed |
description | [Image: see text] In this paper, laminar combustion characteristics of methane/ammonia/air flames are numerically investigated using the Chemkin/Premix code. The initial temperature is set as 298 K; the initial pressures are set as 1, 2, 5, 10, and 20 atm; and the equivalence ratios are set as 0.8–1.6. Laminar burning velocity (LBV); adiabatic flame temperature (AFT); net heat release rate (NHRR); and the mole fractions of H, NH(2), NO, NO(2), and HCN at stoichiometric ratio are studied with ammonia (NH(3)) addition. Meanwhile, temperature sensitivity and rate of production (ROP) are analyzed. The results show that with the increase of the initial pressures, LBV decreases and AFT and NHRR increase. With the increase of ammonia doping ratios, LBV, AFT, and NHRR decrease. From temperature sensitivity analyses, the main reactions that promote temperature rise are R39 (H + O(2) < = > O + OH), R100 (OH + CH(3) < = > CH(2)(S) + H(2)O), R102 (OH + CO < = > H + CO(2)), and R122 (HO(2) + CH(3) < = > OH + CH(3)O). The main reactions that inhibit temperature rise are R53 (H + CH(3)(+M) < = > CH(4)(+M)), R36 (H + O(2) + H(2)O < = > HO(2) + H(2)O), and R46 (H + HO(2) < = > O(2) + H(2)). For the rate of production of the free radical pool, the trends of H and NO are consuming first and then producing, and the trends of NH(2), NO(2), and HCN are the opposite. The pathway from methane to carbon dioxide is CH(4) → CH(3) → CH(3)O → CH(2)O → HCO → CO → CO(2), and the pathway from ammonia to nitrogen is NH(3) → NH(2) → NH/HNO → NO/NO(2) → N(2). |
format | Online Article Text |
id | pubmed-9096957 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | American Chemical Society |
record_format | MEDLINE/PubMed |
spelling | pubmed-90969572022-05-13 Effect of Ammonia on Laminar Combustion Characteristics of Methane–Air Flames at Elevated Pressures Jin, Tao Dong, Wenlong Qiu, Bingbing Xu, Cangsu Liu, Ya Chu, Huaqiang ACS Omega [Image: see text] In this paper, laminar combustion characteristics of methane/ammonia/air flames are numerically investigated using the Chemkin/Premix code. The initial temperature is set as 298 K; the initial pressures are set as 1, 2, 5, 10, and 20 atm; and the equivalence ratios are set as 0.8–1.6. Laminar burning velocity (LBV); adiabatic flame temperature (AFT); net heat release rate (NHRR); and the mole fractions of H, NH(2), NO, NO(2), and HCN at stoichiometric ratio are studied with ammonia (NH(3)) addition. Meanwhile, temperature sensitivity and rate of production (ROP) are analyzed. The results show that with the increase of the initial pressures, LBV decreases and AFT and NHRR increase. With the increase of ammonia doping ratios, LBV, AFT, and NHRR decrease. From temperature sensitivity analyses, the main reactions that promote temperature rise are R39 (H + O(2) < = > O + OH), R100 (OH + CH(3) < = > CH(2)(S) + H(2)O), R102 (OH + CO < = > H + CO(2)), and R122 (HO(2) + CH(3) < = > OH + CH(3)O). The main reactions that inhibit temperature rise are R53 (H + CH(3)(+M) < = > CH(4)(+M)), R36 (H + O(2) + H(2)O < = > HO(2) + H(2)O), and R46 (H + HO(2) < = > O(2) + H(2)). For the rate of production of the free radical pool, the trends of H and NO are consuming first and then producing, and the trends of NH(2), NO(2), and HCN are the opposite. The pathway from methane to carbon dioxide is CH(4) → CH(3) → CH(3)O → CH(2)O → HCO → CO → CO(2), and the pathway from ammonia to nitrogen is NH(3) → NH(2) → NH/HNO → NO/NO(2) → N(2). American Chemical Society 2022-04-30 /pmc/articles/PMC9096957/ /pubmed/35571814 http://dx.doi.org/10.1021/acsomega.1c05938 Text en © 2022 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by-nc-nd/4.0/Permits non-commercial access and re-use, provided that author attribution and integrity are maintained; but does not permit creation of adaptations or other derivative works (https://creativecommons.org/licenses/by-nc-nd/4.0/). |
spellingShingle | Jin, Tao Dong, Wenlong Qiu, Bingbing Xu, Cangsu Liu, Ya Chu, Huaqiang Effect of Ammonia on Laminar Combustion Characteristics of Methane–Air Flames at Elevated Pressures |
title | Effect of Ammonia on Laminar Combustion Characteristics
of Methane–Air Flames at Elevated Pressures |
title_full | Effect of Ammonia on Laminar Combustion Characteristics
of Methane–Air Flames at Elevated Pressures |
title_fullStr | Effect of Ammonia on Laminar Combustion Characteristics
of Methane–Air Flames at Elevated Pressures |
title_full_unstemmed | Effect of Ammonia on Laminar Combustion Characteristics
of Methane–Air Flames at Elevated Pressures |
title_short | Effect of Ammonia on Laminar Combustion Characteristics
of Methane–Air Flames at Elevated Pressures |
title_sort | effect of ammonia on laminar combustion characteristics
of methane–air flames at elevated pressures |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9096957/ https://www.ncbi.nlm.nih.gov/pubmed/35571814 http://dx.doi.org/10.1021/acsomega.1c05938 |
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