Hello, im back with a crazy idea i got while cleaning our log gasifying hot water boiler http://www.centrometal.hr/piroliticki_kotlovi_eng.php?subaction=showfull&id=1231768692&archive=&start_from=&ucat=28&; , sold in France under the ZAEGEL-HELD brand for twice the price! http://www.zaegel-held.com/ecatalogues/chaudieres-bois.php?page=11 Maybe it's because they are located a few kilometers away from Mr Georges Imbert birthplace. It's an inverted draft model with an extraction fan, so some of the ash is entrained with the flow of gasses. When the fumes cool down in the exaust pipe, the tars condense out but they are mixed with the ashes, so it is a very crumbly deposit which can be easily removed. ( it's a clean burning unit with a blue flame, but some tars may escape during start-ups . But if you forget to push the "Glow" button on the control panel, the char bed is burned and not saved for the next start up. You can independently adjust primay and secondary air valves, turning off the combustion air may transform the unit into a gasifier.) Why not build this as a feature in a gasifier : design the grate with a narrow area such as the ashes are carried away with the gas, then the mix is cooled down in a water jacketed cyclone. The ashes may act as a condensing nucleus for the tars. Maybe a multiclone (smaller cylones in serie) design is prefered, despite higher vacuum losses, to get rid of all the finer dust. But maybe it's completely impractical to have dusty gas and then clean it further ? But the idea is that it's easyer to deal with dust than tar. What do you think about it ? Philippe.
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