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Post by johndepew on May 12, 2015 11:54:48 GMT -8
Has anyone tried using ceramic fiber blanket coiled into a riser itself? I have some extra, and the other day, I made a cylinder of heavy hardware cloth, and lined it with a piece of ceramic fiber blanket bent into a hollow cylinder. Then I used a clay/wood ash mixture a couple inches thick around the outside to sort of mortar it into place in a side-riser batch box system. I'm somewhat concerned about durability of the material, not from heat, but from air velocity sweeping the fibers out of cohesion and down stream into the bells. Has anyone else tried this before and found it to be unacceptable? From a performance standpoint, it seemed to work quite well. Thoughts?
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morticcio
Full Member
"The problem with internet quotes is that you can't always depend on their accuracy" - Aristotle
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Post by morticcio on May 12, 2015 12:10:18 GMT -8
You can coat the inside with rigidizer.
I'm due a delivery of ceramic fibre riser sleeves tomorrow. Will be interesting to see if these will be stiff enough not to need the rigidizer.
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Post by johndepew on May 12, 2015 12:39:55 GMT -8
You can coat the inside with rigidizer. What kind of material are you referencing? I'm not familiar with that. *Edit: Quick google search showed me the answer. Sounds like a good idea. |
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morticcio
Full Member
"The problem with internet quotes is that you can't always depend on their accuracy" - Aristotle
Posts: 371
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Post by morticcio on May 12, 2015 23:57:48 GMT -8
Apologies for not elaborating on it in original reply - I was on my mobile.
For the record here is a link to rigidiser (correct spelling  with product description from a local UK supplier.
I was browsing for ceramic fibre applications on YouTube the other day and ended up looking at forges for making knives. These were a similar diameter to risers and were lined with ceramic fibre blanket and then being coated with various materials - Metrikote, Satanite, ITC-100, Plistix and Mizzou to name a few. One recurring theme was that coating reduced the risk of microscopic fibres breaking off from the blanket and possibly causing a health risk. |
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Post by johndepew on May 13, 2015 9:55:32 GMT -8
I guess I've stumbled onto a good idea, maybe. In the test application, the riser should be relatively easy to get to for replacement if need be, so I'm excited to give this a try. Might be a way to make very lightweight, effective risers that could be easily flattened out and transported anywhere if the rigidizer were applied onsite, and not very expensive-under $10 each in materials.
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Post by johndepew on May 13, 2015 9:57:13 GMT -8
$10 per 24" section, I should say. In the cookstove I'm building, only one section is needed. For a regular stove, I'd use two sections probably, but still...not bad.
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Post by johndepew on Sept 4, 2015 17:58:56 GMT -8
Rigidizer is on its way and the cookstove this test riser will go in is mostly built, waiting for the riser before I seal in the cooktop. Pretty excited to see how it does over a winter. Flattenable, shippable risers could be a pretty nice ability to have.
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stoker
Junior Member
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Post by stoker on Apr 14, 2016 10:22:37 GMT -8
Threads where people have done similar things: Kaowool blanket with wire mesh outside to hold it in place: donkey32.proboards.com/thread/1049/small-diameter-backup-supply-worksAnd something very like it on the thread donkey32.proboards.com/thread/1591/killer-3-incher6 Mar 2015 at 8:00am tortue1958 wrote, "Instead of a firebrick or a dual insulated pipe stack, I used 1" ceramic fiber blanket (2300 degree), cut to length and diameter and held together by 1/4" hardware cloth. Super refractive qualities." But then a short time later (17 Mar 2015 at 3:58am) "I cast a riser today, I'll get a chance to fire it up next week." I asked why (was something wrong with the blanket version?) but no answer. I was thinking a non-rigid version might be good for a portable stove: not brittle. |
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Post by exwatermark on Apr 18, 2016 3:01:30 GMT -8
You can coat the inside with rigidizer. I'm due a delivery of ceramic fibre riser sleeves tomorrow. Will be interesting to see if these will be stiff enough not to need the rigidizer. hi morticcio, would you mind sharing where you got your ceramic riser sleeves from please? I too am UK based and I'm almost ready to build my first rocket mass heater and would like to try this method of riser construction. many thanks, Mark |
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morticcio
Full Member
"The problem with internet quotes is that you can't always depend on their accuracy" - Aristotle
Posts: 371
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Post by morticcio on Apr 19, 2016 0:22:55 GMT -8
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Post by ironarch on May 15, 2016 21:32:24 GMT -8
Rocket stove mass heaters ROCK!!!
I am thinking..........
Coated ceramic fiber blanket (alumina-silicate) is absolutely the way to go for the heat riser, these are the space age
materials we have been blessed with the past few decades, thank you NASA and the space shuttle program!!!
Goto: Walmart (online), buy UNITHERM CF6-1-24x25 Ceramic Insulation, this is your blanket material.
Goto: anvilfire.com, buy 1 pint (International Technical Ceramics) ITC-100HT Refractory Coating, your coating material.
This is enough material to make 8-12 heat risers,so experiment to perfection or build some for your friends!
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with product description from a local UK supplier.
