Process Integration Opportunities for Synthetic Natural Gas (SNG) Production by Thermal Gasification of Biomass

摘要: Synthetic natural gas (SNG) from gasified biomass is one promising option to produce renewable transport fuels. This thesis presents a process integration study investigating thermal gasification of for the production SNG and identifies critical conversion steps overall performance. A base case consisting an indirect unit followed by tar reforming, aminebased CO2 separation, isothermal methanation and, finally, compression, H2-purification membrane separation drying presented. Based on lower heating value (LHV) wet fuel feedstock, estimated efficiency 69.4 %. The mass energy balances are obtained using flow-sheeting software analysed pinch methodology. The studies performed highlight significant potential improvement performance offered integrated feedstock drying. In particular, steam low-temperature air – available excess heat shown influence favourably. The with existing combined power (CHP) plants proven be efficiently convert electricity. shows that increased level leads increase in electricity attributed (100 MWLHV dry input) from 2 4.9 MW when drying, 0.5 5.6 without any negative effects yield. Alternative opportunities not aiming at specifically, but replacing fossil fuels production, also highlighted. Biomass cycle plant results high biomass-specific electrical efficiencies up 49.6