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Production of substitute natural gas by biomass hydrogasification
Gepubliceerd door: Publicatie datum:
ECN BM 1-11-2000
ECN publicatienummer: Publicatie type:
ECN-RX--00-038 Conferentiebijdrage
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Gepresenteerd op: Developments in Thermochemical Biomass Conversion, Tyrol, Austria, 17-22 september 2000.

Hydrogen, generated from renewable sources, is likely to play a majorrole in the future energy supply. The storage and transport of hydrogen can take place in its free form (H2), or chemically bound, e.g. as methane. However, the storage and transport of hydrogen in its free form are more complex, and probably would require more energy than the storage and transport of hydrogen in chemical form. An additional important advantage of the indirect use of hydrogen as energy carrier is, that in the future renewable energy supply, pads of the existing large-scale energy infra- structure could still be used. Production of Substitute Natural Gas (SNG) by biomass hydrogasification has been assessed as a process for chemical storage of hydrogen. Thermodynamic analysis has shown the feasibility of this process. The product gas of the process has a Wobbe-index, a mole percentage methane, and a calorific value quite comparable to the quality of the Dutch natural gas. With a hydrogen content below 10 mol%, the produced SNG can be transported through the existing gas net without any additional adjustment. The integrated system has an energetic efficiency of 81% (LHV). In the long term, the required hydrogen for this process can be produced by water electrolysis, with electricity from renewable sources. In the short term, hydrogen may be obtained from hydrogen-rich gases available as by-product from industrial processes. Results of thermodynamic analysis of the process and experimental work, application potentials of the process in the Netherlands, and plans for future development are presented. 21 refs.

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