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SNG production from coal or biomass is considered again due to rising prices for natural gas, the wish for
less dependency from natural gas imports and the opportunity of reducing green house gases by CO2 capture
and sequestration. Coal and solid dry biomass (e.g., wood and straw) have to be converted to SNG by
thermo-chemical processes (gasification followed by gas cleaning, conditioning, methanation of the producer
gas and subsequent gas upgrading). During the 1970s, a number of methanation processes have
been developed comprising both fixed bed and fluidised bed methanation. Meanwhile several new processes
are under development, especially with a focus on the conversion of biomass. While coal based
systems usually involve high pressure cold gas cleaning steps, biomass based systems require, due to
the smaller unit size, different gas cleaning strategies. Moreover, the ethylene content of a few percent,
typical for methane-rich producer gas from biomass gasifiers, is a challenge for the long-term catalyst
stability in adiabatic fixed bed methanation due to the inherent high temperatures.
This paper reviews the processes developed for the production of SNG from coal during the sixties and
seventies and the recent developments for SNG production from coal and from dry biomass.

[ Last edited by wanggch123 on 2011-5-11 at 20:45 ]
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