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Post by smokeout on Jan 7, 2018 16:11:01 GMT -8
My core and riser both melted the perlite out of it. It was a dragon heater clone. I burned both sticks and pellets, with enough heat generated to make the barrel top glow red through the high temp paint. The biggest problem was the coals at the bottom of the feed generating so much hear that the roof of the burn chamber melted, even with the secondary air gap and tripwire. Smokeout said,horseshoehank I tried perlite in my riser and man did it get hot. Right away I noticed a thick black stinky smoke start coming out of the flue pipe. On the next fire up the heat wouldn't come up so I took it down for inspection and found about half my perlite gone. |
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Post by Orange on Jan 10, 2018 7:24:04 GMT -8
My core and riser both melted the perlite out of it. It was a dragon heater clone. I burned both sticks and pellets, with enough heat generated to make the barrel top glow red through the high temp paint. The biggest problem was the coals at the bottom of the feed generating so much hear that the roof of the burn chamber melted, even with the secondary air gap and tripwire. Smokeout said,horseshoehank I tried perlite in my riser and man did it get hot. Right away I noticed a thick black stinky smoke start coming out of the flue pipe. On the next fire up the heat wouldn't come up so I took it down for inspection and found about half my perlite gone. you have a metal riser? I guess this explains it: Softening Point : 1600 - 2000 °F (871 - 1093 °C) |
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Post by Orange on Mar 11, 2018 9:31:10 GMT -8
I got around 650C on the outer side of the core. A bit too high for the rockwool, great for perlite or expanded clay. anyone got some accurate data on thermal conductivity, it varies from 0,05 to 0,4 W/mK depending on type and temperature? maybe its best just to use pure woodash it its around 0,1W/mK  |
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Post by smartliketruck on Mar 17, 2018 14:27:00 GMT -8
I suspect the perlite melting lore mostly from high waterglass binders with higher alkali ratios, the perlite is getting chemically "melted" at higher temperatures by free sodium or potassium.
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