derek
New Member
Posts: 14
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Post by derek on Jan 29, 2016 9:38:43 GMT -8
Hellos,
I am quite new with only a basic understanding of the general aspects of rocketeering.
I want to heat a barn wood-workshop using fuel which I have in abundance: Wood shavings and sawdust, scraps, twigs, branches, etc ... I imagine a top loading batch box to be most convenient. Can someone point me towards an existing design?
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Post by pinhead on Jan 29, 2016 12:04:47 GMT -8
There is no existing design of a top-loaded batch box. The only top-loaded design is the J-Tube.
The only tried-and-true design of the batch box is front-loaded.
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Post by satamax on Jan 29, 2016 12:58:29 GMT -8
Well well well, there's testing going on in italy for the moment
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derek
New Member
Posts: 14
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Post by derek on Jan 30, 2016 0:48:52 GMT -8
Let me start over : )
I want to burn small loose material including wood shavings and sawdust - material which I imagine might clog up an ordinary fire box. What do you suggest might be the most appropriate design to start looking at?
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Post by satamax on Jan 30, 2016 5:18:44 GMT -8
Derek, we all would want this! I think the best aproach is a batch with baskets of what ever you want to feed it. Or Indipendentenergy's latest vertical batch. But it's still at it's developpement stage. And i can't jump in and help, as i have a flat to finish first.
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Post by mintcake on Jan 30, 2016 7:24:02 GMT -8
I think one big issue is going to be the surface area of the sawdust/debris. We've got walnut shells a-plenty here, but they're a compleate pain to burn. They emit their volatiles from their surface area so quickly that I can only put in a small handful at once into my batch-box, or I get very incomplete combustion and black smoke out of the chimney. :-(
I once tried burning sawdust in paper bags, and seem to remember I had the same problem. I think the "real solution" is going to be turn the dust into bricketes (sp?) somehow, so they act more like real wood.
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Post by peterberg on Jan 30, 2016 9:41:49 GMT -8
Here's a video of a barrel-in barrel sawdust heater. In use it's a contraflow stove in that the gases are led down between the inner barrel ond the outer one. The exhaust opening is low at the back or the side. Of course, the air inlet is in the inner barrel only, through the ashpan for example.
Another way to do more or less the same thing: a batch box with a stainless steel basket with low front-to-back a tube made of stainless steel mesh. But then, the sawdust stove is the simplest way to heat a workshop, don't you think?
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dkeav
New Member
Posts: 27
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Post by dkeav on Feb 5, 2016 19:43:33 GMT -8
I wonder what the limiting factor for material size is on a burner setup like this. Around here they have most power lines ran on aerial poles which require tree trimming most summers to maintain. Often the tree trimming contractors will dump as much of the shreddings/chips as you will take for free. If that design could work with chips more in the less uniform and sometimes up to 0.50in cube type size, would be an interesting source for heat.
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derek
New Member
Posts: 14
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Post by derek on Feb 10, 2016 1:14:34 GMT -8
Thank you all!
While I have been aware of barrel in barrel compacted sawdust burners for some time, my wood supply is more varied in size and not amenable to "moulding" into burn and air channels.
Recently I have found a YouTube channel by PPOTTY which details a closed burn chamber, top loading rocket stove design which looks like promising design to try with a basket to contain looser material. If I understand correctly, this design gassifies wood for combustion solely in the riser when operating temperatures are high enough.
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Post by satamax on Feb 10, 2016 8:54:28 GMT -8
The PPoty build has been discussed here before iirc, or was it on permies. Well, he's got a cast riser. But the rest is all metal I think. I'm on the laptop's slow connection. I'm not re watching it all.
May I sugest, build a big batch or J outside first, out of the proper materials, and see what you can burn. How you like it etc.
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derek
New Member
Posts: 14
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Post by derek on Feb 11, 2016 11:01:33 GMT -8
Yes Satamax! You may suggest I build a batch or J-tube! I would really love working from a "reference" design or two - a set of defined dimensions and materials. I see mentions of "Peter Berg's" batch box design here and there - perhaps this is a reference design? Is there a library of these somewhere? (why not? : )
I was a research scientist (neuroscience) so I appreciate experimentation and innovation! I just need a stable platform to start from.
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Post by pinhead on Feb 11, 2016 11:06:22 GMT -8
Yes Satamax! You may suggest I build a batch or J-tube! I would really love working from a "reference" design or two - a set of defined dimensions and materials. I see mentions of "Peter Berg's" batch box design here and there - perhaps this is a reference design? Is there a library of these somewhere? (why not? : ) I was a research scientist (neuroscience) so I appreciate experimentation and innovation! I just need a stable platform to start from. You want reference material? Check out the Reference Library.
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Post by esbjornaneer on Feb 29, 2016 7:03:52 GMT -8
The batch box is the first topic there! Is there a similar reference thread for J-tube designs?
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Post by alanloy on Mar 28, 2016 0:23:04 GMT -8
Here are some principles I gained from one of Peter's threads. (all ideas are Peters, all mistakes are mine)
If we call the system size 1 then the length of the feed, passage and riser
measured at the mid point should be 1.5, 3, 6 total length of feed, passage and riser 2, 4, 6.5
Some variation is possible provided that the passage length is kept short and the feed is less than or equal to 1/4 of the riser height.
NB If I have made any mistakes here could someone PLEASE correct them
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Post by daniel on Mar 28, 2016 5:57:08 GMT -8
derek Loading the batchbox from the top would probably work similar to a J tube rocket heater, I have seen builds of that nature however there could be some benefits to this design, I thought that having the wood for a J tube stay into a larger box would provide more fuel gravity fed.
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