Gasifier Experimenters Kit
Gasifier Experimenters Kit Gasifier Experimenters Kit
Gasifier Experimenters KitGasifier System Componentsopen both graphics to follow the comments.Technical ResourcesGasification Worshop (June, 08)Summary:The GEK v0.9 air preheating / gas coolingarchitecture is raising 25C atmospheric air to@600C by the time the air reaches the nozzlesat the combustion zone. In the oppositedirection, the incoming air cools the outputsyngas to 100-175C before it exits the gascowling.Preaheating the air to 600C significantlyreduces thermal load on the combustion zone,which would otherwise have to do the samehttp://www.allpowerlabs.org/gasification/gek/gekreports/report3/report3.html (2 of 10) [10/9/2008 08:04:38]
Gasifier Experimenters Kitair "preheating" before oxidation reactionscan begin. 600C is above the auto-ignitiontemperature of most components of pyrolysisgas, so the air entering the combustion zone isalready at reaction temperatures without heatinput from existing combustion.Eliminating the thermal drag of coolincoming air results in higher temps in thecombustion zone, greater tolerance tomoisture in the fuel, greater tolerance to highair humidity, and/or increased turndownratio. It also increases combustion rate, whichin the current test resulted in combustionfinishing well before the reductionconstriction-- suggesting we need to lower thenozzle height from the typical "textbook"dimensions.Using the incoming air to internally cool thesyngas greatly reduces the need for postgasifiercooling. In our case, we've eliminatedthe external radiator entirely. Thecyclone,packed bed filter and blower provideenough extra cooling to drop the final outputsyngas temp to 50-75C.Full Report:This data was collected and averaged overthree separate run sessions of 2-3 hours each,in June and July 2008. The fuel was halvedwalnut shells at approximately 15% moisturecontent. The GEK was set up as an inverted V-hearth reduction bell, with 2.5" constriction.The heat exchange lines are 5/8" corregatedSS lines of 4' length. More details on the heatexchange architecture is here: GEK Report#1.http://www.allpowerlabs.org/gasification/gek/gekreports/report3/report3.html (3 of 10) [10/9/2008 08:04:38]
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<strong>Gasifier</strong> <strong>Experimenters</strong> <strong>Kit</strong><strong>Gasifier</strong> System Componentsopen both graphics to follow the comments.Technical ResourcesGasification Worshop (June, 08)Summary:The GEK v0.9 air preheating / gas coolingarchitecture is raising 25C atmospheric air to@600C by the time the air reaches the nozzlesat the combustion zone. In the oppositedirection, the incoming air cools the outputsyngas to 100-175C before it exits the gascowling.Preaheating the air to 600C significantlyreduces thermal load on the combustion zone,which would otherwise have to do the samehttp://www.allpowerlabs.org/gasification/gek/gekreports/report3/report3.html (2 of 10) [10/9/2008 08:04:38]
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