Brian, as velocity goes up, pressure goes down (wing on a plane) BUT, the bigger thing is that the oxidation zone is hotter than the reduction zone.....
Greg Manning, Canadian Gasifier Ltd. Building Hi-Performance Gasifiers, Since 2001 Brandon, Manitoba, Canada 1 (204) 726-1851 -----Original Message----- From: [email protected] [mailto:[email protected]]on Behalf Of Brian D Paasch Sent: Monday, August 09, 2010 1:55 PM To: Discussion of biomass pyrolysis and gasification Subject: [Gasification] Imbert chemistry question Hi all, Got a question about Imbert style downdrafts…. One of the obvious characteristics of an Imbert style gasifier is the hearth restriction. The combustion/oxidation zone is physically larger than the subsequent charcoal/reduction zone. As best I can find in the literature, the size change is worked out so that there is an approximate four-fold increase in superficial gas velocity through the reduction zone versus the oxidation zone. The actual velocity increase is even higher due to the higher temp of the reduction zone over the oxidation zone and also to an increase of total mass as the gasification of the solid fuel adds its molecular load to the gas stream. So my question is, why? Why did the engineers of the Imbert decide that they needed a higher gas velocity through the reduction zone versus the oxidation zone? Thanks! -brian _______________________________________________ Gasification mailing list [email protected] http://listserv.repp.org/mailman/listinfo/gasification_listserv.repp.org http://gasifiers.bioenergylists.org http://info.bioenergylists.org No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.851 / Virus Database: 271.1.1/3059 - Release Date: 08/09/10 01:35:00 _______________________________________________ Gasification mailing list [email protected] http://listserv.repp.org/mailman/listinfo/gasification_listserv.repp.org http://gasifiers.bioenergylists.org http://info.bioenergylists.org
