Swirling Flameless Combustion of Pure Ammonia Fuel
Ammonia combustion has garnered increasing attention due to its potential as a carbon-free fuel. Globally swirling flow in a rectangular furnace generates flameless conditions by high flue gas recirculation. The reverse air injection (RAI) technique enabled stable swirling flameless combustion of pu...
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MDPI AG
2025-06-01
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| Online Access: | https://www.mdpi.com/1996-1073/18/12/3104 |
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| author | Lizhen Qin Hossein Ali Yousefi Rizi Byeongjun Jeon Donghoon Shin |
| author_facet | Lizhen Qin Hossein Ali Yousefi Rizi Byeongjun Jeon Donghoon Shin |
| author_sort | Lizhen Qin |
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| description | Ammonia combustion has garnered increasing attention due to its potential as a carbon-free fuel. Globally swirling flow in a rectangular furnace generates flameless conditions by high flue gas recirculation. The reverse air injection (RAI) technique enabled stable swirling flameless combustion of pure ammonia without auxiliary methods. Experiments with pure ammonia combustion in a swirling flameless furnace demonstrated an operable equivalence ratio (ER) range of 0.3–1.05, extending conventional flammability limits of pure ammonia as a fuel. NO emissions were reduced by 40% compared to conventional combustion, with peak concentrations of 1245 ppm at ER = 0.71 and near-zero emissions at ER = 1.05. Notably, flameless combustion exhibited lower temperature sensitivity in NO formation; however, the ER has a serious effect. Developing a simplified reaction model for ammonia combustion is crucial for computational fluid dynamics (CFD) research. A reduced kinetic mechanism comprising 36 reactions and 16 chemical species was introduced, specifically designed for efficient and precise modeling of pure ammonia flameless combustion. Combustion simulation using the eddy dissipation concept (EDC) approach confirmed the mechanism’s predictive capability, maintaining acceptable accuracy across the operating conditions. |
| format | Article |
| id | doaj-art-31e53df6dc57467fb11890503c537a54 |
| institution | OA Journals |
| issn | 1996-1073 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj-art-31e53df6dc57467fb11890503c537a542025-08-20T02:24:38ZengMDPI AGEnergies1996-10732025-06-011812310410.3390/en18123104Swirling Flameless Combustion of Pure Ammonia FuelLizhen Qin0Hossein Ali Yousefi Rizi1Byeongjun Jeon2Donghoon Shin3Department of Mechanical Engineering, Kookmin University, Seoul 02707, Republic of KoreaDepartment of Mechanical Engineering, Kookmin University, Seoul 02707, Republic of KoreaDepartment of Mechanical Engineering, Kookmin University, Seoul 02707, Republic of KoreaDepartment of Mechanical Engineering, Kookmin University, Seoul 02707, Republic of KoreaAmmonia combustion has garnered increasing attention due to its potential as a carbon-free fuel. Globally swirling flow in a rectangular furnace generates flameless conditions by high flue gas recirculation. The reverse air injection (RAI) technique enabled stable swirling flameless combustion of pure ammonia without auxiliary methods. Experiments with pure ammonia combustion in a swirling flameless furnace demonstrated an operable equivalence ratio (ER) range of 0.3–1.05, extending conventional flammability limits of pure ammonia as a fuel. NO emissions were reduced by 40% compared to conventional combustion, with peak concentrations of 1245 ppm at ER = 0.71 and near-zero emissions at ER = 1.05. Notably, flameless combustion exhibited lower temperature sensitivity in NO formation; however, the ER has a serious effect. Developing a simplified reaction model for ammonia combustion is crucial for computational fluid dynamics (CFD) research. A reduced kinetic mechanism comprising 36 reactions and 16 chemical species was introduced, specifically designed for efficient and precise modeling of pure ammonia flameless combustion. Combustion simulation using the eddy dissipation concept (EDC) approach confirmed the mechanism’s predictive capability, maintaining acceptable accuracy across the operating conditions.https://www.mdpi.com/1996-1073/18/12/3104flameless combustionpure ammoniareverse air injectionswirling flowNOxCFD |
| spellingShingle | Lizhen Qin Hossein Ali Yousefi Rizi Byeongjun Jeon Donghoon Shin Swirling Flameless Combustion of Pure Ammonia Fuel Energies flameless combustion pure ammonia reverse air injection swirling flow NOx CFD |
| title | Swirling Flameless Combustion of Pure Ammonia Fuel |
| title_full | Swirling Flameless Combustion of Pure Ammonia Fuel |
| title_fullStr | Swirling Flameless Combustion of Pure Ammonia Fuel |
| title_full_unstemmed | Swirling Flameless Combustion of Pure Ammonia Fuel |
| title_short | Swirling Flameless Combustion of Pure Ammonia Fuel |
| title_sort | swirling flameless combustion of pure ammonia fuel |
| topic | flameless combustion pure ammonia reverse air injection swirling flow NOx CFD |
| url | https://www.mdpi.com/1996-1073/18/12/3104 |
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