CO2 reduction potential of renewable synthetic natural gas production using power-to-gas technologies : A case study for Scotland
Salas Zavala, Daniel (2018)
Salas Zavala, Daniel
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The purpose of this thesis work is to conduct a Life Cycle Assessment (LCA) regarding the potential for reduction of CO2 emissions from production of Synthetic Natural Gas (SNG) with Power-to-Gas (PtG) technology utilizing surplus renewable electricity generated from wind in application for a proposed general study case based on two local authorities located in the North-East of the Scottish coastline: Aberdeen City and Aberdeenshire. All these done using Life Cycle Assessment (LCA) methodology performed with statistical, reliable data from year 2015 for modeling the required inputs, outputs, material flows, and energy balances of the system, using LCA-GaBi 6.0 software. The interpretation of the results was performed based on the environmental impact category of Global Warming Potential (GWP) for 100 years. The results conclude that the PtG concept holds the potential to play a key role in the overall reduction of CO2 for the conducted study, under the conditions assumed for the analysis on the selected location. Showing that the highest reduction potential of overall GWP was achievable through the up-scaled scenario proposed for 2030. When assuming a substantial increase of available surplus renewable electricity from offshore wind and implementing a PtG system with the benefit of direct utilization of CO2 from the CCS facility located at Peterhead, available in the proximity. The results concluded that the highest GWP reduction potential was achieved for the Scenario 2, when the case of the PtG for 2030 is available, yielding in -2.1745 kgCO2-eq. for the 2 714 938 MWh (8.42E+09 MJel) introduced in the system. Therefore, proposing a compelling case for promoting the potential for CO2 reduction via PtG technology utilization for the North-East of Scotland as a suitable pathway to follow towards achieving the ambitious pursued targets for the quick de-carbonization of the current, and future, Scottish energy system.