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Post by patamos on Apr 30, 2017 9:55:41 GMT -8
Thanks Trev for loading that up.
Apologies for the cloudy imagery. A lot of soot had caked onto the glass from the interim experiments… and scrubbing it off was less effective than letting it burn off.
It is hard to see in this video, but any gasses that start heading up out of the feed box are thoroughly redirected down the P-channel when the top lid is down.
Maybe a bigger P-channel will amplify the effect.
I'm guessing an extra foot of heat riser (8") will offer the same or more smoke-back-free improvement as the taller 6" riser did.
Might give those ideas a go before the teardown...
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Post by ringoism on Aug 19, 2017 10:26:03 GMT -8
Two risers side-by-side from one burn tunnel doesn't work, (in before PvdB) one of them takes over, one is left behind. I observed this reality on a big industrial pottery kiln I was helping to set up about fifteen years ago. Two stacks, one per side, but only one would ever flow at a time!!! -Eric |
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Post by ringoism on Aug 19, 2017 10:45:30 GMT -8
Matt, here you go. Simple batch, exept that the firebox is vertical.  Second version exploded view, there's a chamber behind the firebox, with two ports, one entering it, one going to the heat riser. A bit like Adiel and Shilo's stuff.  Third version, this chamber is open to the firebox, so embers fall into it, but can't block the port wich is further. Several views, and with the firebox top lid open.    I noticed that if well made, opening the lid could also block the P channel, sucking a smidge more air from the firebox, to have less smoke when opening it. "theoreticaly"  Love this, Max. I've had the idea awhile, too, since my small J-system effectively runs kind of like a vertical batch with its long, enclosed, capped feed. Yes, easy to load, and depending where I let the primary air in (fully adjustable both via the top cap and in lower part of the feed), I can burn just the lower tips like a traditional "J" or for more heat let the whole feed area combust / off-gas, more like a batch-box (I do have a secondary air provision) - though without a port, so maybe not all the turbulence I ought to have... Sorry, still no time to figure out the photo hosting... one of these days... Yes, I'd wonder about chimney effect in your box when the lid was opened, as it's at a much higher level relative to the riser, vs. horizontal units. I don't have much trouble with that, but my feed has a much smaller CSA than a true batch. Someone up here in the Himalayas who was obsessed with getting his riser as low as possible (socio-cultural issues as people sit on the floor around their stoves), progressed from a J very similar to mine to a horizontal batch... I think the whole stove is only 18" tall now and based on the videos seems to run well with what to my eyes seems like a very healthy vortex. But if you don't have too many height limitations, maybe a longer riser will help compensate? Well, I know far less about all this than you and most of the others here. And maybe you've built this already? Just ruminating... -Eric |
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Post by satamax on Aug 19, 2017 10:51:34 GMT -8
Eric, i'm way too busy!  |
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docbb
Junior Member
Back from ZA
Posts: 92
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Post by docbb on Nov 7, 2017 22:13:01 GMT -8
.... The whole of the construction looks like something SjangvanDaal did 4 years ago, minus the restricted port, until he switched to batch rocket technology. Hi everybody, Peter, dou you mean this stove ?  |
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Post by satamax on Jul 29, 2018 12:09:40 GMT -8
Sooooo. Test has been done with the vertical batch.
No insulation, dimensions a bit off. 16x23 back chamber. 23x23 firebox. All 500 deep. Port about 70x22, way off for a 16 riser. But i didn't want to cut bricks. Riser, 160 round, insulated with a mix of vermiculite and mapegrout. Ill post the sketchup in a following post.
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Post by satamax on Jul 29, 2018 12:21:44 GMT -8
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Post by Vortex on Jul 30, 2018 2:09:11 GMT -8
Well done Max! you finally got around to trying it out  A real chimney would give it a much better draw. Here's a short video of a little old wood burner of mine that works like that unintentionally: vimeo.com/278630606 Has a 4.5" top hole, 3" round 'port'. Never smokes out the top if it's running on a good chimney. |
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Post by peterberg on Jul 30, 2018 6:13:18 GMT -8
I am not impressed by the results, sorry Max. Too much smoking and flames out the top.
In my opinion you need to do one of two things: close the lid completely or block the air opening at the normal spot, down the front. An alternative: close the lid but leave a small gap at the front, which serves as secondary air inlet from then on.
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Post by satamax on Jul 30, 2018 6:49:09 GMT -8
Peter, on the first video, the wood was still sticking out on top. , and it's flitches of boards i cut this spring. You bet it was smoking.
It is meant to have the lid closed, with a slit at the back, for the P channel. As drawn in the sketchup. Really, for something cobbled up with what i had laying around, it works smokeless for the first time. I'm not too disappointed. I need to give it a proper test, with 45cm dry wood. Lit up on top. On the front, it will have a window. I can extend the firebox to 23 wide, by 30 deep, and 50 high. About right for a 16cm riser.
Check the first video of my second post. #194337
The flames entering the port, are traveling quite fast.
And i find, that in video 194500, i don't have much flame back. Despite having a good 1/3 load in there.
Ok, firebox isn't full size. it's 23x22 for the moment. 2.5 times the riser's CSA. Not too bad.
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Post by satamax on Jul 30, 2018 6:51:22 GMT -8
Forgot the port is 22 high, x 6cm at the bottom, and may be 7cm at the top. Due to bricks being weird shapes.
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Post by satamax on Jul 31, 2018 1:34:07 GMT -8
Peter, i did a full batch yesterday. 40/45 cm long pièces of 6x10 cm pine, well dried.
It overfuelled. For quite a while, starting at 30/40 minutes.
Daft question, Can this be the result of the port being top wide?
Mind you, this is pine, and not hard wood.
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Post by satamax on Jul 31, 2018 11:21:29 GMT -8
Yesterday's videos. Remember that the roar is absent, due to the wind filter of my phone, you can hear the clicks of the phone suppressing the rocket sound!  They might not be in the right order. |
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Post by Orange on Jul 31, 2018 22:32:01 GMT -8
nice flamethrower! Seems that the batch can go any direction as long as the dimensions are right.
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Post by satamax on Jul 31, 2018 23:37:17 GMT -8
It is not full size yet! 23x22X50 firebox for the moment. Should be 23x32 for a 16cm riser. I have no insulation except in the riser.
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