[Terrapreta] Terrapreta Digest, Vol 11, Issue 71, message 8Greg!

[Greg and April]

Too bad, I was thinking about the 100lb propane tanks - that I picked up for 
almost free.

Picked up a few about 5 yrs ago, to make biodiesel, and had a couple of 
extra taking up space - if they was any bigger they would make for a better 
than fair smoker, but as they are, a brisket would have to really be trimmed 
down to fit.

OTOH, I wonder if a pressure kiln could be welded up from rectangular plates 
of boiler steel, and use very large bolts to open and close it for loading 
and unloading - even a kiln rated to 100 psi might prove useful and 
instructive - definitely something to ponder.


Greg H.


----- Original Message ----- 
From: "Nikolaus Foidl" <nfoidl at desa.com.bo>
To: <terrapreta at bioenergylists.org>
Sent: Friday, December 28, 2007 11:49
Subject: Re: [Terrapreta] Terrapreta Digest, Vol 11, Issue 71, message 
8Greg!


> Dear Greg!
>
> You are exactly right. Its a cylinder with a pressure bottom and a 
> submarine
> like pressure lid with a quick opening and closing device, a sealing which
> will work in a temperature range of up to 700 degrees Celsius and a 
> feeding
> tube for compressed air and cooling steam and a pressure release valve 
> which
> keeps pressure at a preset value. Additional you need a security pressure
> release valve which is set some bars higher then your working pressure and
> then you are set to work.Make sure that your pressure kiln can withstand 
> at
> least 2,5 times the working pressure under a 1,5 time higher temperature
> then your working temperature so things dont go out of hand. My kiln works
> at 35 bars and 400 to 450 degrees Celsius and has a 2 " wall thickness 
> made
> of an special heat resistant steel. Its not for backyard operation, its 
> kind
> of expensive for small volumes. I will produce some 20 tons of Charcoal a
> day with this Kiln.
>
>
> Best regards Nikolaus