[Terrapreta] Fwd: torrefied wood or charcoal?

[James Arcate]

Tom:  

 

I saw this discussion re TW or charcoal.  

 

It would be funny if Kingsford was in fact making TW (or more likely
pyrochar) rather than conventional (low yield charcoal).

 

Jim

 

See patent: 

 


United States Patent 

3,950,143


Pyle 

April 13, 1976 

  _____  

Process for producing solid industrial fuel 

Abstract

A solid, low-sulfur, industrial fuel having a fuel value similar to
bituminous coal, and a continuous process for producing the fuel from woody
materials are presented. The process includes the step of initially
predrying the materials if they are moist until the water content thereof is
less than about 15%. The woody materials are then subjected to a limited
carbonization. The materials are heated in a furnace or kiln until
noticeable carbonization begins, and carbonization is permitted to continue
until the fiberous structure of the materials disappears to thereby maximize
production of solid fuel having a high content of volatile combustible
matter. Subsequently, the solid fuel is cooled and conditioned against
spontaneous combustion. The solid fuel may then be pulverized or compacted,
and immediately used, stored, or transported. The process of this invention
optionally may also produce a small quantity of gas having a fuel valve
sufficiently high for use as burner fuel in the predryer. 

  _____  


Inventors: 

Pyle; Owen (Anchorage, KY) 


Assignee:

The Kingsford Company (Louisville, KY) 


Appl. No.: 

05/279,767


Filed: 

August 11, 1972

 

Tom Miles
<mailto:terrapreta%40bioenergylists.org?Subject=%5BTerrapreta%5D%20Fwd%3A%20
%20torrefied%20wood%20or%20charcoal%3F&In-Reply-To=F6A8DAD8-5706-4818-9998-D
64EF0153B65%40yahoo.ca> tmiles at trmiles.com 
Sat Mar 1 23:05:47 CST 2008 

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  _____  

Gerrit, 
 
You can achieve the same thing by altering the volatile content of the
charcoal. Kingsford is probably using the same equipment in the same way
only they may be either leaving more volatile in the char or adding
volatiles to the char in the briquetting process. The grooves in the new
briquette are probably just a designer change in the die.  I suspect either
an additive or a minor change in processing. I think that significantly
lowering the pyrolysis process as in torrefaction would be difficult in
their multiple hearth furnaces. They may be just reducing the residence time
and running the char through faster. 
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