Just seemed too complicated and too many ways for it to fail for me to get my pea brain wrapped around it. However, as Bob said, we will never know unless someone sticks a toe into the water.
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as tone has done…first complete diesel conversion to woodgas…
thierry, my nozzle on my crawler, simple bigger metal piece, seems work well in the updraft system, less heat exposed of all systems and of course no frost problem
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I hope you have a full recovery.
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Wouldn’t those be about 10 times too small?
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I’ve seen Steve Unruh put the idea to use sandblastic ceramic nozzles but not welding tips.
I don’t want to think of how many ports I’d need to cut and weld to make it work.
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Yes, it’s true that they are small, but we could drill them a little bigger (lots of small 4 or 5 mm nozzles like Tone).
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Thierry, copper has good thermal conductivity, but a low melting point, I don’t know if it could withstand these temperature conditions, I think the best material is iron with a lot of carbon.
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I have seen tig cups used (charcoal gasifier). i dont think the contact tips would last very long.
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A while ago people on here came up with silicon carbide, (SiC) as being the best material for nozzles. Now I can’t seem to find so many silicon carbide burner and sandblasting nozzles anymore.
Rindert
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These guys are in India, and have burner and blasting nozzles as well as some other parts. The only real issue is they are an industrial supplier of kiln parts and have minimum quantities. However, they do ship samples of at least certain parts.
And I am wondering if some of this wouldn’t make a great grate.
https://www.firllerrefractories.com/sisic-products.html
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Aussie Dave got me using the Hexaloy tubes for nozzles a ways back, Rindert. I looked at the E bay supplier I got them from and they were no longer in business, at least last year. i never burned one up. I’m using a fluted pipe nozzle now with a water jacket similar to one MattR made a couple years ago. I haven’t really put enough hours on it to know how it will stand up to high use. I’m putting that gasifier on the saw mill and when I get caught up on things here I’ll be using it a lot, so we’ll see.
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Hexoloy is a trade/brand name for sintered silicon carbide. Maybe everyone knows that already but Rindert and Tom are speaking about the same or similar material.
Saint-Gobain owns the trademark and has a large share of the materials production. Here is their datasheet:
Hexoloy® SA Silicon Carbide Technical Data, Saint-Gobain High Performance Ceramics & Refractories
It doesn’t mention it in the S-G datasheet but other sources highlight Silicon Carbide’s resistance to (chemical) reducing environments. A chemist would say that the CO (carbon monoxide) in a gasifier is strong reducing environment. Silicon Carbide is a good fit for that and the high temperatures.
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