A feasibility study for electrofuel implementation with waste-to-energy plant
Examensarbete för masterexamen
Sustainable energy systems (MPSES), MSc
Electrofuel or Power-to-Gas is paid by great attentions nowadays since it could mean to reduce the fossil fuel dependency by renewably production of combustible gas. Main application of gas could be to supply a clean fuel for vehicles which means if the technology is feasible, share of greener energy in transportation sector’s energy mix would be greatly increased. Despite having many studies focused to implement the technology with biogas facilities, very few concentrate on feasibility to apply the same technique with conventional combustion process like waste-to-energy process. Hence in this study, the electrofuel technology of Sabatier reaction, which uses renewable electricity, water and carbon dioxide to produce methane, is examined by integrating with a case study waste-to-energy plant. The study mainly considers the economic feasibility of the combined process of Sabatier and carbon capturing process while perspectives on technical term are also discussed in parallel. Capacity of the process is varied with extreme waste-to-energy plant’s electricity and emission outputs to define the gas production potentials. Profitability of different process sizes is determined as well as sensitivity analysis on key economic parameters such as synthetic natural gas (SNG) price, electricity price or change in investment cost. The work also takes into the account some change due to season that has significant effects to both rate of energy production and relevant profitability. The results show that the integration is feasible especially when the SNG price is high which is likely in the near future. When the process size increases, the change in investment cost plays less important role in total process cost. It can also be observed that such change in production capacity, break-even points of SNG price decreases while reverse trends can be gained in case of electricity price. Besides variation on key economic parameter, another critical factor is electrolyzer efficiency which operating cost can be significantly lower when more efficient electrolyzer is used.
Energi , Transport , Hållbar utveckling , Energisystem , Energy , Transport , Sustainable Development , Energy Systems