Re: Gasifier fundamental question

["A.D. Karve" <adkarve@pn2.vsnl.net.in>]

Paul asked what difference it made if the gas burnt in the upper part of the
stove and the charcoal on the grate.  According to him, heat was heat, and
as long as all the fuel was burnt, and all the heat released, it should not
make any difference, whether the heat came from the gas or from the
charcoal.  I feel that the location of combustion has an effect on
transfering the heat to the pot.  The charcoal burning on the grate is at
least six inches from the pot and therefore it may not trasfer all its heat
to the pot, whereas the gas burning just below the pot may trasnfer
relatively more heat to the pot. That is why it makes sense if the volatile
part of wood and the charcoal are burnt in two separate stoves, each
designed to burn a specific fuel.
A.D.Karve
-----Original Message-----
From: Paul S. Anderson <psanders@ilstu.edu>
To: Crispin <crispin@newdawn.sz>; Stoves <stoves@crest.org>
Cc: Bob and Karla Weldon <bobkarlaweldon@cs.com>; Ed Francis
<cfranc@ilstu.edu>; Tsamba--Alberto Julio <ajtsamba@zebra.uem.mz>; Lily
Coyle <astrozen2000@hotmail.com>
Date: Sunday, April 14, 2002 3:21 AM
Subject: Re: Gasifier fundamental question


>Stovers,
>
>Crispin wrote, and I emphasize:::::::
>
>>Many thanks for all the energy contributors spend adding fuel to this
fire!
>
>And that includes Crispin messages, too.
>
>Short Notes from Paul:
>
>1.  Ron correctly notes that MY terminology (such as use of "burning" when
>I should say "pyrolysis") leaves much to be desired.  But Ron responded so
>well that now Crispin has been able to respond with some clear statements
>that raise questions.
>
>2.  When properly functioning (which was not the case with my stoves on
>Crispin's patio), the Juntos stove does NOT give noticeable "smoke" (that I
>think of as "visible particles"), but there are certainly some issues of
>unseen gasses, as with all stoves.  When the Juntos gasifier unit has
>sufficient chimney of a couple of inches, the gasification goes to the end
>without smoke, with the result being only glowing charcoal.  Problems arise
>when some of the fuel has fallen through the grate and therefore continues
>to give gasses (smoke) when the charcoal is removed.
>
>3.  A stove that is lighted, functioning, and hot is a different beast from
>a cool-start stove.  Therefore, adding in fuel on top of a hot charcoal bed
>WITH EXTREME CONTROL OF THE PRIMARY AIR  entering under the charcoal COULD
>(in my humble opinion) have pyrolysis gasification down low where the
>charcoal is in contact with the new fuel and then also have the secondary
>combustion of the gases a few inches above the top of the fuel load.  But
>issues of fuel types (including different moisture content of the same
>fuel) could become more important than when those fuels were in the
>top-lighted gasification configuration.(?)
>
>Please keep the comments coming, and feel free to separate out the diverse
>topics into separate threads of messages.
>
>I am learning, and I hope others are also.
>
>Paul
>
>
>
>
>
>Paul S. Anderson, Ph.D.,  Fulbright Prof. to Mozambique 8/99 - 7/00
>Rotary University Teacher Grantee to Mozambique >10 mo of 2001-2003
>Dept of Geography - Geology (Box 4400), Illinois State University
>Normal, IL  61790-4400   Voice:  309-438-7360;  FAX:  309-438-5310
>E-mail: psanders@ilstu.edu - Internet items: www.ilstu.edu/~psanders
>
>
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