Hållbarhetsaspekter vid förbränning av grot och RT-flis på KVV8 hos Fortum Värme

Sammanfattning: This master thesis examined two different fuels from a lifecycle perspective and from a systemic perspective. The work focused on the combined heat and power plant, CHP8, at Fortum Värme’s plant at Värtahamnen. The fuels examined were tops and branches (grot) and recycled wood chips (RWC) where the field is studied including regard to changes in soil carbon. The results showed that recycled wood produced the lowest greenhouse gas emissions. RWC were estimated to release 0.7-1.7 g CO2-ekv per MJ fuel, compared to10.3-17.5 g CO2-ekv per MJ fuel for grot. This applied when the biogenic emission was excluded for RWC. The result showed that grot from the Baltic countries had lower greenhouse gas emissions, 10.3 g CO2-ekv per MJ fuel, than domestic grot from central Sweden, 17.5 g CO2-ekv per MJ fuel. Finally, this work showed that combustion of biofuels at KVV8 reduced emissions from the northern European electricity grid.