tone, the little burnt away piece of metal…maybee this depends on the gas exit out of the gasifier in the double mantle, if only one exit of some more around the gasifier, the gas travels the shortest way and so not a even heat distribution…? or the slags have created a ostacle, gas concentrates too near to the metall, overheating…like as in charcoal gasifiers can happen…?
perfect work, not much maintenance needed…
ciao giorgio
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There in the “Volvo” thread, I said something about reworking the gasifier or the hot zone, well, let’s not just talk about it,…
comparison old and new unfinished unit
old and new nozzle, in the middle the nozzle for the upper part
larger diameter of the restriction pipe
nozzles installed in a diameter of 14" for gasification of fuel against the walls and a tube for reflection of hot radiation around the upright grille are also missing
of course I will save the old unit as a good spare part if the attempt fails
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Thanks Tone. That reflection pipe is getting real hot. Doesnt it meld?
The Tone nozle is made of some very hard material if I remember correct. Did you drill holes in it?
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Oh, I didn’t realise the mishap required a complete rebuild. Couldn’t you just have kept running as is? Or just patched up the burnt edge of the reduction tube? I would probably have choosen the first.
I do understand you want to experiment with new nozzles and such, but personally I’m too lazy to ever do any serious rebuild until I really need to and experimentation ideas rarely leave the thinking chair. I’m truly impressed by your total lack of “work-fear”. My hat is off.
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I agree with JO, but I can see Tone you are a can I make it better, with this new design concepts of a gasifier build. Good quality type of craftsmanship you have. The Tone Gasifier. TT Gasifier.
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There wasn’t much time to work around the gasifier today, well, but I managed to finish the “hot zone” and install it inside. Here are some pictures.
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Impressive 
Really “thinking outside the box”
I got a feeling this would work especially well with woodchips.
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It’s been said that kristjan builds em fast, Jakob builds em fast, even I build them fast, but sir my hat is off when you set to your work the production flows
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Thank you Goran and Marcus, … here are some more pictures before the start, the ash is close to the assembly parts, charcoal for the first start,… less weight - faster start, a little more space for fuel, approx. 120 liters in total.
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I still owe you this much, and then I’ll give you peace…
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Tone what you have achieved overall is amazing.
Externally so very, very simple and direct.
Internally so become very, very sophisticated. Flows-demand self-regulating.
Some would maybe quietly chritizize, " But none other could fabricate/weld such hearth internal complexity to be air tight! No other could operate it as efficiently as him!"
Not the point at all, eh.
You now have something that works well for you with your on-place inputs; for your on-place needs.
Any can take away as they will.
Want to make a better world? Change your own personal surrounding world first. (Not my saying. Repeated and spread as good.)
Best Regards
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Very nice and sleek build. Again 
I totally agree with Steve and all the others that gave a like.
I hope I am speaking for everyone that we all like to see your builds and videos. Thank you and keep up the good work 
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I’m starting repeat myself a lot, but I can’t come up with anything but IMPRESSIVE.
Tone, if you don’t mind…I’m pretty sure you have told us before…and maybe I could find out again if I really put some effort into it…but what does that little valve with those blue hoses do?
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JO , with this valve I throttle the air flow towards the vacuum pump, which is on the alternator, it sucks in air depending on the revolutions, so with a certain setting of this valve, the vacuum increases, if the engine starts to spin faster and this closes the gas valve,… and vice versa, when the revolutions fall, the hatch opens, … this is how I maintain the working revolutions.
If I say something else about the gasifier, the hot zone is made of rather thin sheet metal, the heat exchanger (vertical grate) has a 25% larger surface area, the main nozzles are approx. 18 cm away from the restriction tube (5 cm closer than in the old unit). You can feel a much smaller negative pressure than with the previous unit, so the air setting on the mixer is much more open, time will show the sensitivity and other characteristics of the unit.
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Wow, this is a amazing gasifier build for this size of engine. A wood gasifier with the second stage charcoal gasifier. What does the upper 5 tubes do? Adding air in that part of the hopper where the pyrolysis of wood is taking place?
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I scanned all the way back to the start of this thread to try and see how the new configuration is different from the old. This really should be condensed down to just the build itself With just comments directly related to the build and operation. It would be a valuable resource but I suppose a time consuming task. Still running a diesel on pure wood gas is a major accomplishment and should be documented.
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I agree with Tom on this. Tone’s grate nozzle design is a radical departure from what we were doing before, and I think it needs it’s own category.
Rindert
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Yes I agree, this is a total new type of gasifier and approach with the vertical grate preheating the incoming air for the upper nozzles.
A two stage operation raw wood pyrolysis to charcoal making good wood gases in the upper stage, and then in the lower part in the vertical grate area it becomes a charcoal gasifier making more char gases with the lower nozzle and then mix the two gases together and burning it in a diesel engine.
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An easy way to sort these become long, long thread topics.
On the R.H. vertical scroll bar click open the Dec 2021.
Takes you the opening topic post by JanA.
At it’s bottom edge will be a left-right avatars listing of all who have commented and contributed.
Since your interest is Tone’s now evolved in-use system click on his avatar there and narrow down only then read his posts in this topic thread. 330 so far with lots and lots of pictures.
S.U.
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A brief report on the operation of the system:
- startup is slightly faster, but not significantly
- during operation, you can feel much less resistance, the gas is constantly strong, it drops a little only after really long idling
- something really “strange” is happening upstairs in the gasifier, apparently large quantities of pyrolysis gases are produced, which are converted into very strong gas below, after stopping the flame is very large and burns for a long time, this happens without blowing air into the gasifier, with the previous unit this phenomenon was not so pronounced. Obviously, the upper nozzles, which are buried in the ash, cool the pyrolysis process much less and the heat is preserved more
I am attaching a video that shows this situation…
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