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Feasibility of biomass/waste-related SNG production technologies: Final Report
Gepubliceerd door: Publicatie datum:
ECN BM 1-7-2003
ECN publicatienummer: Publicatie type:
ECN-C--03-066 ECN rapport
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Based on comparable basic assumptions, a technical, economic, and ecologicalassessment has been performed for the biomass/waste-related SNG production technologies, with the objective to make a selection for future implementation of the most promising options. Anaerobic digestion, upstream pressurised oxygen-blown or indirect gasification with downstream methanation, hydrogasification followed by methanation, and, in less extent, the co-production of Fischer-Tropsch-SNG have been studied within this project. Although substitute natural gas (SNG) has not yet been incorporated as an alternative fuel in the Dutch and European renewable energy policies, it can play an important role in realisation of the Dutch and European climate and renewable energy targets. Based on the modelling results, the upstream pressurised oxygen-blown or indirect gasification with downstream methanation routes seemed to be the most promising options for SNG production from biomass. The RD&D trajectory for candidate SNG production processes, consisting of three development stages (Proof of Principle, Proof of Concept, demonstration of a complete integrated process on pilot scale), is expected to take about 10 years for indirect gasification and 8 years for pressurised oxygen-blown gasification. Also a period of four years is expected to be necessary for the market introduction. The indirect gasification technology, after development, will score better with respect to all aspects, compared to pressurised oxygen-blown CFB gasification, and therefore it has been selected for future development for SNG production. Through this gasification technology almost 100% carbon conversion can be achieved, resulting in a tar-free (by using the ECN OLGA process), low-nitrogen, and high-hydrocarbon content synthesis gas. The technology has also the potential of upscaling to a commercial scale on the long term. In combination with downstream methanation, SNG production efficiencies up to 70% can be achieved. The SNG production cost for this process is 7.8 ?/GJ (compared to the current market price of 8.7 ?/GJ). With a potential SNG production capacity of approximately 15 PJ a year, this process has the potential to fulfil approximately 5% of the Dutch renewable energy target in 2020, or even 20% of the biomass- related target. The SNG production capacity of this process until 2020 is 128 PJ. The costs per tonne CO2 avoided and the total avoided CO2 emission until 2020 are ? 83, respectively, 7.2 Mtonne.

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