[Terrapreta] (no subject)

[Gerald Van Koeverden]

This system does sound rather expensive to buy, like Antal's flash  
carbonization system which costs $250,000.  But if your cost of  
producing a ton of charcoal is only $45/ton, it sounds like it must  
be much more efficient.  Did you include the cost of the system in  
your costing? Or is the cheapness all due to cheap labour?

On 28-Dec-07, at 1:49 PM, Nikolaus Foidl wrote:

> 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
>>
>> Message: 8
>> Date: Fri, 28 Dec 2007 08:57:39 -0700
>> From: "Greg and April" <gregandapril at earthlink.net>
>> Subject: Re: [Terrapreta] Terrapreta Digest, Vol 11, Issue 70
>> To: "Terra Preta" <terrapreta at bioenergylists.org>
>> Message-ID: <004901c8496a$5fb94ec0$2101a8c0 at GREG>
>> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
>> reply-type=original
>>
>> Ok, how does one make a high pressure kiln - I keep having this  
>> vision of a
>> metal box with a presser relief valve that opens once it reaches a  
>> certain
>> pre set pressure.
>>
>> Greg H.
>>
>> ----- Original Message -----
>> From: "Nikolaus Foidl" <nfoidl at desa.com.bo>
>> To: <terrapreta at bioenergylists.org>
>> Sent: Thursday, December 27, 2007 14:10
>> Subject: Re: [Terrapreta] Terrapreta Digest, Vol 11, Issue 70
>>
>>
>>> Dear Gerhard!
>>>
>>> I only heat the Wood up to 280 degrees Celsius .In my atmospheric  
>>> kiln
>>> this
>>> takes some 3 hours. ( Gas outlet temperature from the gas tube).  
>>> I still
>>> don't know how many time it will take on my new high pressure  
>>> kiln. The
>>> torrefied wood is very brittle as most of the hemi cellulose is  
>>> already
>>> gone
>>> and the cellulose is partially charred.
>>
>>
>>
>>
>> ------------------------------
>>
>>
>
>
>
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