cab
New Member
Posts: 33
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Post by cab on Mar 7, 2019 5:44:00 GMT -8
This is looking more and more like a gassification wood boiler. Check out the natural draft Varmebaronen UB 40....
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Post by Vortex on Mar 7, 2019 6:10:28 GMT -8
You mean like: www.youtube.com/watch?v=gKZJFOsDLmUThose down draught gasifiers must have very high particulate emissions with the double vortex constantly stirring the ashes up like that.
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Post by peterberg on Mar 7, 2019 6:21:23 GMT -8
Cab, could you please point out what the similairities are between the DSR2 and the Värmebaronen Vedolux 40 UB?
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Post by coastalrocketeer on Mar 7, 2019 10:19:28 GMT -8
They both are rectangular and burn wood... that’s about it...
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Post by josephcrawley on Mar 7, 2019 11:46:00 GMT -8
Neat boiler but no similarity at all.
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cab
New Member
Posts: 33
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Post by cab on Mar 7, 2019 12:44:10 GMT -8
They both have a firebox with a port leading to a secondary burn chamber. They are both natural draft. Sure, the Varn secondary chamber is under the firebox, but they both operate in much the same fashion, burning wood gas in a separate, secondary chamber, using natural draft. Gee, nothing similar here between this gassifier and the DSR2:
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Post by gadget on Mar 7, 2019 13:03:29 GMT -8
I'm still trying to figure out the advantage of a lower secondary chamber. i'm guessing it has to do with passing the volatiles through the coals as they head to the second chamber?!? Less pyrolysis if its a bottom up burn?!? I know some of the them say to start a small fire first on the grate then load ontop of that.
Peter have you ever tried a secondary chamber underneath?
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cab
New Member
Posts: 33
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Post by cab on Mar 7, 2019 13:23:14 GMT -8
I have wondered why we don't see this configuration more myself. There are a few on the market but they are rare. I would assume the benefit would be to draw the wood gas through the fire. I would like to see some experimenting in this direction....
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Post by wiscojames on Mar 7, 2019 13:46:13 GMT -8
You know what they say, if you want something done right.....
We all love innovation around here.
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Post by peterberg on Mar 7, 2019 13:47:58 GMT -8
Cab, you started to say the DSR2 and the Värmebaronen Vedolux 40 UB looked alike. But the pictures above shows a DSR2 and a Walltherm instead . You turned the Walltherm picture upside down to illustrate the similarity and to the eye there is. But the approach to combustion of my design is radically different, being rather an updraft gasifier than a downdraft one.
In case you mean there are two chambers with glass in front and visable fire behind the glass in both, you are right. The similarity ends once one would look inside to the way this image is created.
It might be that you would like to see a free design using the same downdraft principals as in a wood gasifier. Maybe this is something you could develop yourself and release as open source?
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Post by peterberg on Mar 7, 2019 13:57:17 GMT -8
Peter have you ever tried a secondary chamber underneath? A heater like the Walltherm need to be heated up in updraft mode for half an hour in order to create enough draft. During this heating up it burns as clean or dirty as a bog standard box stove. My goal has been a system that burns clean within 5 to 8 minutes, no more. This way the clean burning period in every run is as long as possible. Long ago I tested a Walltherm, twice. Maybe I could take this discussion to a new thread and dig up the results?
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cab
New Member
Posts: 33
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Post by cab on Mar 7, 2019 14:21:19 GMT -8
Yes, I mentioned the Värmebaronen Vedolux 40 UB initially, but my comment applies as well to the other downdraft gasifiers. I couldn't find a good photo of the Värmebaronen Vedolux 40 UB in action or I would have used one. The Walltherm is also quite similar in appearance.
No doubt the weakness of a downdraft is the startup which requires an updraft to warm the flue and produce a draft. Once that is established, they seem to draw just fine through the fire. Perhaps they are inherently cleaner once in downdraft mode, I don't know but it could result in a positive net. A Värmebaronen Vedolux 40 UB owner I know tells me it takes about 10 minutes after ignition to switch to downdraft gasification mode. It would seem to be an interesting approach. We've seen ports on the top, back, sides, but not the bottom. Given the commercial products, I continue to wonder why this hasn't been attempted.
No, I am not looking for a "free design", I simply made an observation.
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Post by independentenergy on Mar 7, 2019 14:41:00 GMT -8
some examples of downdraft existed
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serg247
Junior Member
The mountain can not be conquered, it can allow it to ascend...
Posts: 111
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Post by serg247 on Mar 7, 2019 14:42:00 GMT -8
R177DXL Michels.
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Post by peterberg on Mar 8, 2019 1:26:51 GMT -8
Those down draught gasifiers must have very high particulate emissions with the double vortex constantly stirring the ashes up like that. Good point, I wonder how these gasifier guys are achieving low PM 2.5.
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