| Title | Experimental Study of Biogas-Hydrogen Mixtures Combustion in Conventional Natural Gas Systems |
|---|---|
| ID_Doc | 12732 |
| Authors | Amez, I; Castells, B; Llamas, B; Bolonio, D; García-Martínez, MJ; Lorenzo, JL; García-Torrent, J; Ortega, MF |
| Title | Experimental Study of Biogas-Hydrogen Mixtures Combustion in Conventional Natural Gas Systems |
| Year | 2021 |
| Published | Applied Sciences-Basel, 11.0, 14 |
| Abstract | Featured Application The results of this study show that the addition of hydrogen to biogas in small quantities allows the reuse of conventional natural gas systems to burn biogas. This lowers costs and promotes the circular economy. 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% CO2), BG60 (40% CO2), and BG50 (50% CO2). 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 CO2. 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 CO2 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/2076-3417/11/14/6513/pdf?version=1626347063 |
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