Hi Jim and colleagues, Always good ideas to pick up from these WW2 gasifiers.
video of Swedish A. B. Gasgenerator. more things to learn from the ancients! i just stumbled across this rebuild project of an old sweedish gasifier on youtube. the done unit is here: http://www.youtube.com/watch?v=UeVWicL-ygw the start is here: http://www.youtube.com/watch?v=juapv4nq4a4&NR=1 Before you get excited about the simplicity, first identify the type of gasifier you are looking at. This is a charcoal gasifier with a cloth filter, never used for wood gasifiers, because of the condensate issues. there are many interesting details on these machines. note the long curved cooling tubes that conform to the reactor/hopper. they nicely junction into a box on each end where they can have the pipe cleaner poker passed through. designed for service, as they should be! Horizontal pipes only work with a charcoal gasifier, because the gas is dry and rarely needed cleaning. the second video shows the inards of the filter. i'd never seen this type of hoop and cloth filter. very interesting. still, i think if they had our reticulated foams in all ppi back then, they'd likely be using such. then again, we still build k&n filters out of gauze (though not to great filtering success). Page 174-5 of Gegas The Swedish Experience, shows a photo and explains that cloth filters can be cleaned with compressed air in charcoal gasifiers, and washed with water for wood gas with filters of other design. the cyclone looks badly out of proportion. i doubt the swedes would get this wrong, so maybe there is an inner tube that is the actual spin cylinder. maybe they did this to get the big wide bottom catch basin while also protecting the user against hot surfaces. The large crude proportions, were to separate charcoal sucked out of the ash box, so not designed for fine particulates. there are many well considered features on this unit to achieve compactness. it shows many generations of product refinement to fit the car mounting. it is a long way from a raw series of tanks connected together by tubes. but what else would we expect from the swedes . . . Charcoal gasifiers can be made very small, because without condensing moisture, the cooling and filtration becomes much more simple. Failure to design for condensate cooling with raw fuel systems will cause a lot of grief if you pick up the wrong ideas for the wrong type of gasifier. Hope this can clear up the way forward for those who are copying these systems. Doug Williams, Fluidyne Gasification.
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