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Old 08-05-2009, 09:08 PM   #11
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This one looks like it talks about alot of the design Downdraft Gasification (Gasifier, Woodgas, Gengas, Producer Gas ) the building of a unit.

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Old 08-05-2009, 09:18 PM   #12
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Originally Posted by spittinfire View Post
How are they trapping the gas and forcing it into a generator? Is it similar to a propane burning engine? if so that would require a way to pressurize it. Can you post a link to what you're talking about?
The one on the show is here: The Colony : Builds To Survive : Discovery Channel

There are several of their projects, select gasifier.
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Old 08-05-2009, 09:32 PM   #13
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I see some intersting challenges with simply using a pipe and feeding it into the air intake. Without seeing details priming could be an issue. I'm curious as to how they got the engine started. They could use a fan of some sort to blow the gas into the engine, it was done on some desiels in years past or perhaps the turning over of the engine is enough.

Air/fuel mixture is also a concern.

I would be intersted to know the qualities of the gas and possible long term effects on the combustion chamber, piston rings, valves, valve guides and seals.

Still a very interesting idea and something that will be of discussion on Saturday as my dad and I continue a 347 build for a customer.

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Old 08-05-2009, 09:42 PM   #14
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Here is a series of vids on youtube explaining gasification

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Old 08-05-2009, 09:45 PM   #15
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It's a sealed container, so the air/fuel has only one direction to go... out the tube into the fuel tank. I too am curious about the long term affects on seals. rings, and other relevant components.

That first video I posted shows it at work and it seems to run like a dream. No hesitation. Other videos on youtube show people driving cars with it.

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Old 08-05-2009, 09:56 PM   #16
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I undestand the movement of the gas naturally from the heated source into a tank. I was more concerned with how they directed it into the engine without some type of pressure tank unless they are using the heat source as pressure to move it into the engine which would work but then you're burning hot fuel and hot air, not very efficient.
As well as hooking an ignition source up to a large tank of explosive gas which doesn't excite me. One backfire and we'd all loose our eye brows.

Could you cool the gas first so you can mix more fuel/air for more power?

How are they metering the fuel and air? A carb could be jetted but you'd need to isolate both the fuel and the air to do so which I'm not sure would work anyway. I really think you'd have to use a propane like system which brings me right back around to the pressure issue.

This will be good conversation on Saturday.

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Old 08-05-2009, 10:05 PM   #17
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Me too, I'm still researching the process. I do like these



Woodgas Camp Stoves

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Old 08-05-2009, 10:11 PM   #18
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Here is a schematic of a downdraft gasifier from Victory GasWorks Downdraft Gasifier - Victory Gasworks- Gasifiers and Wood Gasification

wood_gasifier.jpg

This looks like a good site if you want information on how to build one http://www.gengas.nu/byggbes/index.shtml

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Old 08-06-2009, 05:48 PM   #19
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I can see how that would get the basics taken care of but still, how to you correctly meter the fuel/air mixture?

Here they are using a blower to draw the gas into the motor which will introduce air to the gas prior to the carb. How do you maintain consistancy?

I was also curious about how consistant the gas itself is. Does differnt wood give you different properties? or heat? ambient temp?

Great guys! way to give me another thing I feel the need to research, understand and possibly build. Maybe I'll be the first guy mowing his lawn with a wood powered John Deere.

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Old 08-06-2009, 05:59 PM   #20
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I've seen wood out gas many times, but I've never done anything to harness it. If you look closely when you have a nice hot campfire burning with coniferous wood, the smoke will be blue, but the wood will be giving off whitish gray fumes. That's the wood out gassing what is essentially a turpentine that is given off when the sap and pitch in the wood evaporates under the heat of the fire.

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