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Title:
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The potential of “Power to Gas” technology integrated with biomethane production
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Author(s):
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Published by:
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Publication date:
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ECN
Biomass & Energy Efficiency
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27-11-2014
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ECN report number:
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Document type:
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ECN-M--14-067
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Conference Paper
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Number of pages:
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Full text:
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13
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Download PDF
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Abstract:
A feasibility study on integration of “Power to Gas” technology with bio-methane production from bio-syngas produced by biomass gasification shows that a significant amount of excess electricity can be accommodated in bio-SNG production. By adding hydrogen produced from intermittent renewable sources to the methanation section, production capacity of methane can be doubled in a flexible operation scheme, while gas quality and cold gas efficiency are hardly affected. Considering two possible limits for H2 allowed in the natural gas product, it was found that a limit of 10 % v/v can be easily reached. However, a much stricter limit 0.5 % v/v also considered by some pipeline operators cannot be reached with the conventional reactor studied. Simulation and experimental results show however, that with an advanced reactor using sorption enhanced (SE)-methanation the stricter H2 limit can also be reached. The corresponding CO and CO2 conversions where close to 100%.
The methanation and SNG upgrade section mode need to deal with a considerable variation in mass flows and variations in the heat balance when switching between hydrogen addition and CO2 removal mode.
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