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Post by hiddengarden on Jan 15, 2013 9:20:58 GMT -8
lellet salone
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Post by hiddengarden on Jan 15, 2013 9:27:39 GMT -8
this is on pellet s alone. I am thining that the feed tube isnt putting enough fuel on grate ?? as other pics shows larger flame when veggie oil is added.?
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Post by chrisburge on Jan 16, 2013 4:17:13 GMT -8
check out the video-->[youtube]http://www.youtube.com/watch?v=sZPywGTfw2k&feature=youtu.be [/youtube] this is a little 4.5" system i built to test induction, but with the induction port removed. instead, the feed tube has been rebuilt with one brick removed on the bottom. in that space is a sideways facing ashbox that i made by using an old cheap-o wood chip smoker box. i cut a grate in one end of the lid with tin snips (6 cuts, 7 vanes) and bent the strips to a 45 degree angle such that the incoming draft is directed up, forward through the fire, and into the burn tunnel. the box w/the lid on leaves about a 1/2" gap at the top of the space left by the missing brick. the dried piece of clay/perlite mix, leftover from the old induction port, fits perfectly into this gap and is an awesome little draft control device . i have also installed a little pellet feeder made from a piece of 2"x4" steel channel with a rectangular hole cut out on one long side. it sits right on top of the grate and feeds the pellets quite nicely across the entire grate without overflowing into the burn tunnel. a full load is ~3lbs and burns for almost an hour. In the first part of the video, i have the clay plug out as i have just lit the fire and the pellets are just starting to burn across the entire grate. you can see how this allows air to draft in across the top of the fire as well as the bottom to get this going. i then shine a flashlight on the little bugger so you can see it in all its slap-together glory. this is just a mock up to test geometry and things like the pellet feeder. in the second part of the video, the fire is really cookin' as i have now plugged up that gap with the clay plug and i've thrown in a stick of maple for good measure. you can hear the stupendous draft ripping through the pellets now and see the gasification that is giving that jet-rocket roar i plan to use this feeder and ashbox combo as a removable element in a 4" one-piece cast system, but i'll use a piece of removable steel channel as a grate. here's some deconstruction photos: here it is before demo here you can see how the pellet feeder takes up half of the feed tube Here's a good cross-section... ...you can see from the soot pattern that the high temp zone is even, front to back, since the riser is not insulated. something else to note here is that while the feed tube is 4.5" wide, it's only as long as the ash box is wide (4"), giving it a smaller CSA than the burn tunnel (4.5"x4.25")-- but this is made up for by the total 4"x1" additional gap left by the ashbox just under the riser tube...you can see the clay slip that I used to stick things together with is spalling not a shot you get to see very often
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