9 existing and new parts of the sng production

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Unformatted text preview: r) waterbased gas cleaning (NH3 , HCl) compression and guard beds shift reactor methanation MILENA as BFB/O2 ash/char tar recycle to combustor of indirect gasifier recycle to BFB or combustor of indirect gasifier Fig. 9 Existing and new parts of the SNG production facility at ECN. ECN-RX--04-085 15 CONCLUSIONS (1) ”Green Gas” as SNG (Synthetic Natural Gas) can play an important role in the transition process from the present Dutch fossil fuel-based energy supply to a renewable fuel-based economy. (2) Although upgrading of biogas, produced via anaerobic digestion of wet biomass, will be interesting for the short-term introduction of “Green Gas” in the Dutch energy supply, the supercritical water gasification processes seem to be more promising for conversion of wet biomass to “Green Gas” on the longer term. (3) Atmospheric indirect steam-blown gasification and pressurised oxygen-blown CFB gasification are the most suitable technologies for co-production of FischerTropsch transportation fuels and SNG from biomass. Co-production is economically more feasible than the production of both energy carriers in separate processes. (4) Atmospheric indirect steam-blown gasification and pressurised oxygen-blown CFB gasification with downstream methanation are the most promising routes for stand-alone SNG production from relatively dry biomass feedstocks, resulting in SNG production efficiencies up to 70% LHV. Atmospheric indirect steam-blown gasification is more suitable for decentralised (< 100 MWth) applications, while pressurised oxygen- blown CFB gasification is more suitable for centralised (> 100 MWth) applications. (5) The successful integrated lab-scale demonstration of “Green Gas” production confirms the potential of the ECN gas cleanup concept to deliver a product gas that can satisfy, among others, the specifications for downstream methanation. (6) For a 100 MWth stand -alone system and biomass costs of 2.3 €/GJwood the SNG production costs range from 7.8 to 8.5 €/GJSNG and the CO2 emission reduction costs range from 83 to 95 €/tonne. (7) Both processes of co-production of FT transportation fuels and “Green Gas” from biomass, as well...
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