Enhanced life cycle modelling of a micro gas turbine fuelled with various fuels for sustainable electricity production. (October 2021)

• Record Type: Journal Article
• Authors: Ayaz, S.Kagan; Altuntas, Onder; Caliskan, Hakan
• Is Part Of: Renewable & sustainable energy reviews. Volume 149(2021)
• Publication Date: 2021-10
• Subjects: Energy -- Environmental assessment -- Exergy -- Fuel -- Life cycle assessment -- Micro gas turbine; Renewable energy sources -- Periodicals; Power resources -- Periodicals; Énergies renouvelables -- Périodiques; Ressources énergétiques -- Périodiques; 333.794
• DOI: 10.1016/j.rser.2021.111323
• Languages: English
• ISSNs: 1364-0321

Abstract

Abstract: In this study, exergy and life cycle-based enhanced environmental (EXEN) and enviro-economic (EXENEC) analyses are performed on a micro gas turbine, operated with natural gas and alternative mixtures of natural gas-ammonia and natural gas-methanol. A novel iterative method that considers compressor pressure, turbine pressure, mass flow rates in the turbomachines, and net power output (100 ± 3 kW) is used for simulation. Exergy analysis is applied, after which EXEN and EXENEC are performed. The EXEN shows that 50% natural gas-50% ammonia combustion has the lowest CO and CO2 emissions, and that natural gas combustion has the lowest NO emissions. 50% ammonia combustion decreases CO2 emissions by 48.9%, CO emissions by 50.12%, exergy output by 58.62%, and increases NO emissions by 2.37% compared to the natural gas. For 50% secondary fuel combustion, the CO reduction for ammonia compared to methanol is 56.33%. Ammonia combustion creates more NO compared for every same fraction of methanol. The EXEN values for GHG-100 (GHG: greenhouse gas) are found to be as follows: 29, 404 kgCO2 eq/month (CO2 eq: CO2 -equivalent); 27, 395 kgCO2 eq/month and 25, 797 kgCO2 eq/month; 23, 406 kgCO2 eq/month; 21, 501 kgCO2 eq/month; 19, 651 kgCO2 eq/month for natural gas; 10%–50% ammonia, respectively. The released CO2 eq prices (GHG-100) in a month are decreased from $1005 to $672 with ammonia combustion. Methanol combustion decreases EXEN values (GHG-100) from 29, 400 kgCO2 eq/month to 19, 275 kgCO2 eq/month and EXENEC values (GHG-100) to $659. Ammonia has better CO2 and CO combustion-based reduction than the same fraction of methanol, while methanol leads to a 0.27%–1.9% better life cycle-based environmental performance compared to other fuel options. Highlights: Exergy and life cycle based enhanced environmental and enviroeconomic analyses are performed to the micro gas turbine. Ammonia and methanol additions can be solutions to fossil fuel utilization and CO2 -equivalent emissions in gas turbines. Novel life cycle approach has been implemented to calculate the lifetime performance of the micro gas turbine.