Experimental Study of Biogas–Hydrogen Mixtures Combustion in Conventional Natural Gas Systems
Biogas is a renewable gas with low heat energy, which makes it extremely difficult to use as fuel in conventional natural gas equipment. Nonetheless, the use of hydrogen as a biogas additive has proven to have a beneficial effect on flame stability and combustion behavior. This study evaluates the b...
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MDPI AG
2021-07-01
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| Online Access: | https://www.mdpi.com/2076-3417/11/14/6513 |
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| author | Isabel Amez Blanca Castells Bernardo Llamas David Bolonio María Jesús García-Martínez José L. Lorenzo Javier García-Torrent Marcelo F. Ortega |
| author_facet | Isabel Amez Blanca Castells Bernardo Llamas David Bolonio María Jesús García-Martínez José L. Lorenzo Javier García-Torrent Marcelo F. Ortega |
| author_sort | Isabel Amez |
| collection | DOAJ |
| description | Biogas is a renewable gas with low heat energy, which makes it extremely difficult to use as fuel in conventional natural gas equipment. Nonetheless, the use of hydrogen as a biogas additive has proven to have a beneficial effect on flame stability and combustion behavior. This study evaluates the biogas–hydrogen combustion in a conventional natural gas burner able to work up to 100 kW. Tests were performed for three different compositions of biogas: BG70 (30% CO<sub>2</sub>), BG60 (40% CO<sub>2</sub>), and BG50 (50% CO<sub>2</sub>). To achieve better flame stability, each biogas was enriched with hydrogen from 5% to 25%. The difficulty of burning biogas in conventional systems was proven, as the burner does not ignite when the biogas composition contains more than 40% of CO<sub>2</sub>. The best improvements were obtained at 5% hydrogen composition since the exhaust gas temperature and, thus, the enthalpy, rises by 80% for BG70 and 65% for BG60. The stability map reveals that pure biogas combustion is unstable in BG70 and BG60; when the CO<sub>2</sub> content is 50%, ignition is inhibited. The properties change slightly when the hydrogen concentrations are more than 20% in the fuel gas and do not necessarily improve. |
| first_indexed | 2024-03-10T09:45:54Z |
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| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T09:45:54Z |
| publishDate | 2021-07-01 |
| publisher | MDPI AG |
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| series | Applied Sciences |
| spelling | doaj.art-56867bcb9e5e4279b2ab8b4ff8447ec22023-11-22T03:10:58ZengMDPI AGApplied Sciences2076-34172021-07-011114651310.3390/app11146513Experimental Study of Biogas–Hydrogen Mixtures Combustion in Conventional Natural Gas SystemsIsabel Amez0Blanca Castells1Bernardo Llamas2David Bolonio3María Jesús García-Martínez4José L. Lorenzo5Javier García-Torrent6Marcelo F. Ortega7Department of Energy and Fuels, E.T.S. Ingenieros de Minas y Energía, Universidad Politécnica de Madrid, 28003 Madrid, SpainDepartment of Energy and Fuels, E.T.S. Ingenieros de Minas y Energía, Universidad Politécnica de Madrid, 28003 Madrid, SpainDepartment of Geological and Mining Engineering, E.T.S. Ingenieros de Minas y Energía, Universidad Politécnica de Madrid, Ríos Rosas 21, 28003 Madrid, SpainDepartment of Energy and Fuels, E.T.S. Ingenieros de Minas y Energía, Universidad Politécnica de Madrid, 28003 Madrid, SpainDepartment of Energy and Fuels, E.T.S. Ingenieros de Minas y Energía, Universidad Politécnica de Madrid, 28003 Madrid, SpainDepartment of Energy and Fuels, E.T.S. Ingenieros de Minas y Energía, Universidad Politécnica de Madrid, 28003 Madrid, SpainDepartment of Energy and Fuels, E.T.S. Ingenieros de Minas y Energía, Universidad Politécnica de Madrid, 28003 Madrid, SpainDepartment of Energy and Fuels, E.T.S. Ingenieros de Minas y Energía, Universidad Politécnica de Madrid, 28003 Madrid, SpainBiogas is a renewable gas with low heat energy, which makes it extremely difficult to use as fuel in conventional natural gas equipment. Nonetheless, the use of hydrogen as a biogas additive has proven to have a beneficial effect on flame stability and combustion behavior. This study evaluates the biogas–hydrogen combustion in a conventional natural gas burner able to work up to 100 kW. Tests were performed for three different compositions of biogas: BG70 (30% CO<sub>2</sub>), BG60 (40% CO<sub>2</sub>), and BG50 (50% CO<sub>2</sub>). To achieve better flame stability, each biogas was enriched with hydrogen from 5% to 25%. The difficulty of burning biogas in conventional systems was proven, as the burner does not ignite when the biogas composition contains more than 40% of CO<sub>2</sub>. The best improvements were obtained at 5% hydrogen composition since the exhaust gas temperature and, thus, the enthalpy, rises by 80% for BG70 and 65% for BG60. The stability map reveals that pure biogas combustion is unstable in BG70 and BG60; when the CO<sub>2</sub> content is 50%, ignition is inhibited. The properties change slightly when the hydrogen concentrations are more than 20% in the fuel gas and do not necessarily improve.https://www.mdpi.com/2076-3417/11/14/6513hydrogen additionbiogasbiogas combustionrenewable fuelscombustion behaviortemperature behavior |
| spellingShingle | Isabel Amez Blanca Castells Bernardo Llamas David Bolonio María Jesús García-Martínez José L. Lorenzo Javier García-Torrent Marcelo F. Ortega Experimental Study of Biogas–Hydrogen Mixtures Combustion in Conventional Natural Gas Systems Applied Sciences hydrogen addition biogas biogas combustion renewable fuels combustion behavior temperature behavior |
| title | Experimental Study of Biogas–Hydrogen Mixtures Combustion in Conventional Natural Gas Systems |
| title_full | Experimental Study of Biogas–Hydrogen Mixtures Combustion in Conventional Natural Gas Systems |
| title_fullStr | Experimental Study of Biogas–Hydrogen Mixtures Combustion in Conventional Natural Gas Systems |
| title_full_unstemmed | Experimental Study of Biogas–Hydrogen Mixtures Combustion in Conventional Natural Gas Systems |
| title_short | Experimental Study of Biogas–Hydrogen Mixtures Combustion in Conventional Natural Gas Systems |
| title_sort | experimental study of biogas hydrogen mixtures combustion in conventional natural gas systems |
| topic | hydrogen addition biogas biogas combustion renewable fuels combustion behavior temperature behavior |
| url | https://www.mdpi.com/2076-3417/11/14/6513 |
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