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Post by treeclimber1 on Nov 25, 2013 12:28:09 GMT -8
Hi
I am new around here.
I am working on an outdoor rocket furnace that will burn wood chips. I had already purchased a length of 6"x 3/8" thick steel for the riser and 7"x3/8" tube for the fire box, before I found this forum. From reading on this forum I understand that steel will burn through quickly. If I were to cast an insulating refractory around the steel would the refractory just crack up and deteriorate when the steel burns through because of it expanding and contracting? Perhaps I should just take back the steel.
Phil
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Post by satamax on Nov 25, 2013 12:59:03 GMT -8
Phil, 3/8 thick is real thick, and most certainly it would crack your refractory. You could may be make 4 cardboard fins on your tube, and cast in between. Then it wouldn't crack i think. Tho, when all your metal has burned, your CSA will be bigger. It will take a while. I used thick steel once, and what hapened is that the metal delaminated, and expanded. The tube wall was may be one inch thick by then, starting from something like your 3/8. Don't know what more to say.
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Post by 2tranceform on Nov 25, 2013 13:21:40 GMT -8
Perhaps I should just take back the steel. Phil I thought about doing the same thing when I first came across rocket stoves. Then, after I learned a bit from the experience of others, I came to the same conclusion that I believe you did. Steel does not belong in the burn tunnel or the heat riser. If it were me, I would do something else with the steel pipe (return it, coat rack, etc.  ). |
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Post by treeclimber1 on Nov 25, 2013 17:55:53 GMT -8
I will probably return the steel then. I will probably use thinner steel lined with insulating refractory. Will this work well?
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Post by colinsaengdara on Nov 26, 2013 17:49:54 GMT -8
Yes, insulative refractory with stainless steel needles for strength should make a very durable heat riser.
Have you designed your feed and hopper yet for wood chips? I have access to free wood chips and am currently mulling over the best stove design to take advantage of them. I'm thinking of a retort positioned above a peterberg stle batch box so that i can burn it normally, or add wood gas when i fill the retort. After the wood gas burns off, i can save the charcoal for forge and garden.
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Post by treeclimber1 on Nov 27, 2013 21:04:17 GMT -8
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).