Gasifier Experimenters Kit

Gasifier Experimenters Kitis all of about 5" of travel. Another 200-250Cor so is lost on the rise up to the gas outlet,resulting in 100-175C at the gas cowlingoutlet. (Post reactor cooling in the cyclone,filter and blower bring the final temp down to50-75C, but none of this heat is recoveredback into the system).The air inlet temps show nearly the samechanges but in the opposite direction. 25C atthe air inlet. 300-350 at the bottom of the heatexchange tube spirals, where the grateintersects the gas cowling. 450-500C at theinner grate, next to the reduction bell wherethe air tubes turn up to penetrate the reactorbottom and go to the nozzles. And again, 550-625C at the nozzles.Through the entire air in and syngas out path,the differential temp seems to hover around150C. This does not suggest the heat in thesyngas is equal to the thermal sink of theincoming air. I seem to remember the syngasout has about 40% more heat capacity thanthe incoming air, due mostly to volumedifferences (can someone clarify the specificshere?). This suggests the syngas is a better airpreheater than the incoming air is a syngascooler. The only reason the syngas out gets ascool as it does is from the added heat lost tothe surrounding gas cowling and othersurfaces.This excess of sensible heat in the syngas outvs the air in also suggests the heat exchangesystem will be relatively tolerant of less-thanoptimaldesigns, and still result in near maxpossible air temps at the nozzles. To thedegree the heat exchange efficiency isimproved, there is additional capacity we canuse to do other heating work, while stillending at the same temps at the nozzles, andalso further cooling the output gas.http://www.allpowerlabs.org/gasification/gek/gekreports/report3/report3.html (9 of 10) [10/9/2008 08:04:38]