Hi Rob
ok so this thread has drifted quite far from my original inquiry.
Sorry about that.
I was looking for specific, or even close estimates, of the acrolein
emissions from glycerol burning in an open flame boiler/burner
unit..not for its use as a motor fuel, or its combination with
nitrogen.
"Depending on the temperature, the thermal degradation of vegetable
oils is a polymerisation (200-300 °C), a degradation of vegetable
oils into acrolein, ketene, fatty acids then formation of alcanes,
alcenes above 300 °C and finally a formation of a gas-liquid mixture
from around 500 °C up."
-- ACREVO study:
http://www.biomatnet.org/secure/Fair/F484.htm
BioMatNet Item: FAIR-CT95-0627 - Advanced Combustion Research for
Energy from Vegetable Oils (ACREVO)
Lower temperature of combustion, more acrolein.
It needs higher temps than 500 deg C to burn the by-product anyway.
you can burn the glycerin portion, and the excess methanol if you
haven't removed it, but the burner soon gunks up with black and
horribly abused but unburnt soap. I haven't managed to get full clean
combustion at about 700 deg C and it may have been higher than that.
Michael Allen reckons it needs 1,000 deg C and five seconds'
residence time, and maybe pre-heating and atomization too I thought.
We've been finding good solutions for by-product use, and good
solutions for burners as well, though we haven't given up yet on
burning the by-product.
How are you planning to burn it?
Best wishes
Keith
-Rob
_______________________________________________
Biofuel mailing list
Biofuel@sustainablelists.org
http://sustainablelists.org/mailman/listinfo/biofuel_sustainablelists.org
Biofuel at Journey to Forever:
http://journeytoforever.org/biofuel.html
Search the combined Biofuel and Biofuels-biz list archives (50,000 messages):
http://www.mail-archive.com/biofuel@sustainablelists.org/
