adiel
Junior Member
Posts: 119
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Post by adiel on May 2, 2015 6:33:12 GMT -8
like shilo said - wow! i have never seen flames like that. almost totally translucent! and the spiral path is hypnotizing. www53.zippyshare.com/v/NG97zwqw/file.htmlstill - we didn't get it fully. it is not as clean as we want and we get smoke when we open the door. but we see the potential! we did two cores. in the second one we made another air intake before the second port. we start to think that maybe the second chamber need to be wide enough to make the rams horns. so we think about doing two round risers - first one smallright after the box and second one tall and larger - we use an 8" casted riser. the first port will be pvdb normal port and would not be in the corner but like we do the sided boxes - 2" from the corner. then a 7" riser and a biger port almost the size of the system csa. again - an air intake there. what do you think? |
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Post by independentenergy on May 2, 2015 12:10:18 GMT -8
Wow Adiel !!! is a dragon !!!  |
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Post by matthewwalker on May 2, 2015 18:43:18 GMT -8
Awesome!!
The reason it isn't clean for you guys is because it needs better fuel metering. It is set up for a slower delivery, if you pyrolize all at once like you do with a normal rocket you can overfuel it. Slow it down a little by controlling the primary air a bit better...don't blow off so much fuel at once.
On the other hand, wide open and with more air downstream is probably cool too!
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Post by shilo on May 3, 2015 0:21:46 GMT -8
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Post by patamos on May 3, 2015 10:58:44 GMT -8
Shilo, was there anything different from Matt's design (other than primary air modulation) in your core layout?
I am getting ready to build one and am wanting to be clear on the effect of variables.
Also, Matt, in the (rear) windowless version would the replacement bricks be flush with those in the rear wall? And does the width of this port dimension play a major role in the secondary combustion process?
I'll be building with splits (because i have them) and am considering ways to insulate between the batch box and surrounding. Ideas welcome...
But I do like the idea of the insulated fire brick. Then coating it with mix of sodium silicate and (not too) fine sand at 1-1 ratio. With the right amount of water it makes a great putty that can be hand-smeared onto the bricks. I did this up to 1/4" thick on the walls and roof a brick masonry heater fire box 4 years ago year and so far it is holding up quite well.
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Post by shilo on May 3, 2015 11:11:27 GMT -8
all the insulated fire bricks was broken after 2 hours fire. and the rear ceramic glass too |
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Post by matthewwalker on May 3, 2015 19:20:43 GMT -8
Yeah Pat, the dimensions do matter. I'd leave it the same, just put brick where the window would be.
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Post by patamos on May 4, 2015 9:28:46 GMT -8
Thanks Matt,
Will do…
So if Shilo's box got super hot from not reducing primary air flow… we had best assume that an uneducated user (e.g.. house guest) will at some point do the same. Maybe skookum splits are the way to go.
Shilo, were there any possible point loads along the edges of your glass placement? Shifting framework from thermal expansion would be my first guess for the cracking. One 2mm grain of sand is all it takes...
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Post by shilo on May 4, 2015 11:20:33 GMT -8
too much air can't overheat a rocket. it can only cooling it.
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Post by matthewwalker on May 4, 2015 15:33:40 GMT -8
Exactly. Rockets are cooler when they are overfueled. My bricks are fine after twice daily use for months now. So is my glass.
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Post by shilo on May 4, 2015 20:23:49 GMT -8
I too was thinking my bricks are fine until I opened the stove to change the configuration.
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adiel
Junior Member
Posts: 119
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Post by adiel on May 4, 2015 22:42:06 GMT -8
i must say shilo that it is possible that the bricks that didn't make it were 23 - to 1250 c. and the glass was old and been to a lot. so we cant tel for sure.
but from what i've experienced the insulating materials are not without cracks. even after curing in a kiln. they are getting cracks where the pressure is - where its cold.
there is nothing like fire bricks. wish they could insulate:)
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Post by pyrophile on May 5, 2015 0:07:14 GMT -8
What you say surprises me as light refractory bricks withstand high heat without problem! I use them and reuse (use them again) them!
For example, it is common to reuse light bricks from ceramic kilns. They don't crack and everybody in ceramics know that they can be used again. Tempreatures are high in ceramics AND last for hours.
Benoit
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Post by shilo on May 5, 2015 1:07:38 GMT -8
Tempreatures are high in ceramics AND last for hours. but change slowly
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Post by pyrophile on May 5, 2015 1:36:59 GMT -8
Well, those bricks are porous and then withstand thermal shocks very well.
They are made for thermal shocks and what happens in our little fireboxes is not big for them!
Benoit
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