Re: GAS-L: Emissions of sulfur dioxide from biomass gasification plants

["Drift, A. van der" <vanderdrift@ecn.nl>]

In our CFB gasifier (0.5 MWth input) we did many measurements on H2S and COS
formed during the gasification of many different biomass materials like
demolition wood, willow, sewage sludge (mixed with wood), railway sleepers,
cacao shells etc. In all cases 20-50% of the sulpher in the fuel is
converted to H2S (85-90%) and COS (10-15%). In these experiments no
dolomite, limestone or other additive was used to reduce emission. 

Regards,

Bram van der Drift
ECN Biomass
POBox 1
NL  1755 ZG Petten, the Netherlands
tel: (31) 224-564515
fax: (31) 224-568487
Email: vanderdrift@ecn.nl

	Does anyone have any information on how much sulfur dioxide forms
when a
	woody biomass fuel is gasified?
	
	I have various woody fuels with 0.02%  - 0.08% w/w dry basis sulfur
(as
	sulfides) that I wish to gasify.  Does all the sulfur convert to
sulfur
	dioxide or other gaseous sulphur compounds, or does some convert to
sulfates
	and stay in the ash.?  Does gasification produce less sulfur dioxide
than
	combustion?  What influences how much sulfur dioxide is formed?
	
	Regards,
	
		Jim

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