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Title:
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Feasibility of biomass/waste-related SNG production technologies: Final Report
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Author(s):
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Published by:
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Publication date:
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ECN
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1-7-2003
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ECN report number:
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Document type:
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ECN-C--03-066
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ECN publication
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Number of pages:
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Full text:
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117
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Download PDF
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Abstract:
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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