GAS-L: Densification vs Briquetting

["Thomas Reed" <tombreed@home.com>]

Dear Stovers and Gasifiers:

I have had a 23 year interest in densification and briquetting of biomass,
but continue to come up with new insights and questions.

1)  Wood has a VERY strong cellular structure and so requires VERY high
pressure to make pellets/cubes/logs.  This is DENSIFICATION and uses 100
hp-hr/ton and machines like the California Pellet Mill, the Taiga extruder,
the JD cuber etc.

2) Charcoal is very weak and the cell structure is mostly broken down.
Therefore it is only necessary to paste the particles together to get a
dense fuel.  This is BRIQUETTING and uses a pillow or hand briquetter and
handpower-hrs/kg.

                                                    ~~~~~~
Now comes an interesting question.  Sugar manufacture requires intense
pressure to squeeze out the juice.  Can the resulting bagasse be dried and
briquetted or does it require densification?

Nut hulls are often very dense.  Can they be briquetted or do they require
densification?

Paper is quite dense, having had the cell structure of the wood broken down.

There should be a scale of power requirements vs type of biomass, and I
presume there are many forms of biomass that do NOT require high pressure to
get a reasonable fuel density.

COMMENTS?

Yours truly,                    TOM REED

         Dr. Thomas Reed
  The Biomass Energy Foundation
 1810 Smith Rd., Golden, CO 80401
303 278 0558;
tombreed@home.com; www.woodgas.com
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