Jodopottery@AOL.COM on sat 3 jun 00
I am trying to build a test kiln that is basically a miniature of my larger
70 cu ft gas downdraft kiln. I plan to make it about 18" by 22.5" by 18" with
a 5" sprung arch. Using soft brick and angle iron for a frame. Since it is
going to be a down draft, I will create a channel on the base or floor of the
kiln leading from the door back to the flue exit and then start the first
ware shelf on top of this channel. My question is I only want to use one
burner but I can't decide where to mount it.
One option I am considering is to mount it below the base or floor of the
kiln on the door side (below the door) so the flames initially go into the
kiln under a base or floor shelf which is open about 2.5 " on each side. I
would also use a target type brick to direct or baffle the heat to the front
and back of the kiln.
Another alternative is to just mount the burner on one side with a target
and let the flames circulate. The problem I see with the latter is that I
will have one side cooler than the other with only the one burner.
So, if anyone has any experience in building small gas fired downdraft
kilns using only one burner, could you please let me know how you mounted
your burner. As usual, thank you all in advance for your excellent advice.
Hank Murrow on sun 4 jun 00
>I am trying to build a test kiln that is basically a miniature of my larger
>70 cu ft gas downdraft kiln. I plan to make it about 18" by 22.5" by 18" with
>a 5" sprung arch. Using soft brick and angle iron for a frame. Since it is
>going to be a down draft, I will create a channel on the base or floor of the
>kiln leading from the door back to the flue exit and then start the first
>ware shelf on top of this channel. My question is I only want to use one
>burner but I can't decide where to mount it.that I
>will have one side cooler than the other with only the one burner.
> So, if anyone has any experience in building small gas fired downdraft
>kilns using only one burner, could you please let me know how you mounted
>your burner. As usual, thank you all in advance for your excellent advice.
>
OK Jodopotter; I'll bite on this. An alternative would be to use one mixer;
and divide the mixture between two or more flame retention tips to spread
the flame sources around. For example, my Doorless Fiber Kiln of one cubic
meter (30 cu ft) size runs on one Eclipse 2" mixer supplying a manifold
having sixteen small (3/4") flame retention tips. Result: very even wash of
flame up the walls; and only one valve to control the kiln. $18 per firing
to C/10 over 36 hours (I love a long fire above melt temperature). Hope
this is a help to your thinking about this problem, Hank in Eugene
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