[Stoves] Crispin´s kiln -- Bourry Birebox gasifier heater

[Peter Singfield]

At 01:57 PM 7/6/2007 -0700, Tom Miles wrote:
>Peter,
>
>So you can have any kind of a reactor you want as long as it has an arc? :-)
>

Well -- I have bad luck in the past with pushing resistance heating past
even 1600 F -- 

I also had bad luck 'containing' a plasma arc -- to hot -- could not find a
refractory to contain it -- plus electrode consumption --

Actually -- using an "ARC" was poorly expressed -- better would be using a
plasma arc torch -- and as atmosphere -- gasifier product.

Plasma arc torches run a long long time between replacements. (Up to 1000
hrs) Tungsten electrodes is now a well proven technology -- and not so
expensive -- every tig welder has one!!

Cone 10 is so very hot -- and it does require some serious thought on
achieving - -especially for the time periods required.

A good diesel burner could probably do it -- and maybe at better efficiency
than as diesel engine fuel to generate electric heating.

But you can't really dual fuel that diesel burner -- and expect to still
maintain those kinds of temps.

I have seen small cast iron foundries using diesel fuel/air burners -- and
that barely reaches the very maximum temps that are require to melt and
with some super heat to pour cast iron -- short of using pure O2 rather
than air.

Any bit of maladjustment of the burn and one just heats and heats and heats
-- never melting the cast iron well enough. And talk about diesel
consumption -- atrocious!!

O2 and diesel -- now that makes a really terrific "torch" -- I saw such
torches being used to cut out granite blocks in quarries in Northern
Vermont many years ago -- as example.

The other kind of Plasma torch.

I remember seeing a small electrical resistance furnace in a chemistry lab
-- it used bands of graphite as the resistance heater -- but I believe they
needed changing often.

>I found a modification of the Bourry design that looks like it might have a
>more uniform gas pattern. The concept is adaptable to stickwood or sawdust
>like designs. 
>
>Ken Goyer shows a variety of traditional wood kilns that can be improved on.
>http://www.bioenergylists.org/en/kilnsandbrick
>
>I wonder how the Bourry compares in performance to the stickwood and sawdust
>fired kilns of the kind that Manny Hernandez has been building. 
>http://www.bioenergylists.org/en/kilnbuilding
>http://www.bioenergylists.org/en/hernandezkilnethos
>

I'm curious about this -- and should be checking it out.

Certainly -- getting a kiln up to cone 10 is not so simple a task!!

But does Crispin need cone 10??

Oh well -- I guess he has lost interest in his own subject line??



Peter/Belize

>
>Tom
>