Eva Gallagher on sat 23 feb 08
Hello,
I found that I did not have any trouble bringing up the temp in my wood
fired train kiln, but it cooled too fast so has anyone tried mixing hard and
K-26 soft bricks on the interior wall to slow down the cooling rate? Since
the bricks are laid without any mortar I was thinking of replacing about 50%
near the front with hard brick and then progressively decreasing the
number - the reasoning being that the front is much hotter so can take more
heat loss. The back needs a lot of side stoking once the front has reached
temp. The outside layer is all insulating brick.
Regards,
Eva Gallagher
Deep River, Ontario
----- Original Message -----
From: "David Hendley"
To:
Sent: Friday, February 22, 2008 6:11 PM
Subject: Re: Kiln Building Question
>I don't agree with the theory that K23 and K26 bricks should
> not be mixed because of excessive wear. Your idea of using the
> K26s around the fireboxes and bottom of the kiln is excellent.
> I did just that in my 10-year-old fastfire-style wood kiln and
> it has held up great. The area where the flame comes in the
> kiln is the area of heaviest wear, and even the K26s show signs
> of wear - K23s would have been toast by now.
> Increasing the wall thickness to 8 1/2 " is also an excellent idea.
> You will not be sorry.
> David Hendley
> Maydelle, Texas
> david(at)farmpots(dot)com
> http://www.farmpots.com
>
>
> ----- Original Message -----
>>I recently purchased a unfired MFT/OFT kiln, dismantled and moved it. The
>> kiln used oversized K23 bricks/single wall throughout. I'd like to change
>> to a double wall, increasing wall thickness from 6 to 81/2". I have a
>> number of K26 bricks that I' was thinking about using in the firebox
>> area/
>> bottom few courses of the kiln walls. I read a previous post that
>> cautioned about combining K23 and K26, citing that thermal expansion
>> rates
>> will cause brick wear. Is there a way to use the different bricks in a
>> way
>> that this would not be a signficant concern? Say if I had two complete
>> courses of K26 and switched to K23 for the rest of the Kiln would that be
>> less of a concern. Thanks, George
>
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shane mickey on sat 23 feb 08
eva
i think it would be wise to put some hardbrick upnear the firebox as they will also last longer, how tall is the train chamber?
You may just throw in a couple row lock or header course of hard brick which will also tie the walls together nicely. this would add'
to the heat retention you seek. One other thing, are there passive dampers? if so and if your not currently doing this, once the
damper is closed, pull all your passives out, this quickly slows the draw of the chimney and keeps alot more heat in thus slowing the
cooling. hope this helps
shane mickey
kiln building and design services
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