Crispin and other Stovers,
Subject line changed because the theme has changed. Some earlier
messages about this new thread are below (they were under the old thread.)
Vertical fuel feed by gravity is a key part of the "Dasifier" of more
than a decade ago (and described on the web). But it had forced
(induced) draft.
I learned from Agua Das about it, and later was able (with a few key
changes) to make it natural draft, but not a perfect product. I showed
that at ETHOS 2006, and I have made smaller ones, even down to the size
of a one-gallon can. This evolved into the AVUD gasifier as described
in "Micro-Gasification: What it is and why it works" published in
Boiling Point. And that is the essence behind the continuous feed
biomass furnace of Chip Energy, with mechanical feeding and forced air.
My point is this: We (the generic "we" meaning many of us) know how to
do many of these things. But there simply is not enough time and
certainly no serious funding to press forward with these efforts. I am
now working to get the US$16 Mwoto Quad TLUD-ND into mass production in
Uganda. To do what we are discussing about natural draft continuous
feed small stoves is another equally large or larger project, and to
work on it could seriously endanger all of my efforts in Uganda with
TLUDs. In Uganda I must do "business". Stove development and
experimentation does not get any financial support.
From all that I can see (during 11 years working on small cookstoves),
there is not sufficient support for small innovative efforts. So my
focus has been on the TLUD technology, not the small AVUD methods.
Sorry that this ended up being a "Lament". There are just too many
things to do. And the early days on the Stoves Listserv we would talk
about such things as fuel feeding for small stoves, and we did
experiments. But now the pressure is for making millions of stoves
that exist, and pressure to NOT be distracted by designing of stoves
that should or could exist but do not have proven track records. That
is just the way that it is.
Paul
Paul S. Anderson, PhD aka "Dr TLUD"
Email: [email protected] Skype: paultlud Phone: +1-309-452-7072
Website: www.drtlud.com
On 10/23/2012 9:54 AM, Crispin Pemberton-Pigott wrote:
The Mayon Turbo Stove is the first commercially available stove I saw
that used a tap to feed and there are some complaints about the need
for attention to keep it going, partly because of the rice hull fuel
being so light and low power. The possibility of using another feed
method is attractive.
So I am looking for a way to use the burning of the fuel right at the
hopper outlet to do the job of releasing fuel now and then or 'often'.
It doesn't look good at the moment but it might! Never assume anything.
Alex I am booking to see you mid Nov as I have to collect a piano from
the Carrying Place area.
Regards
Crispin back in Jakarta
------------------------------------------------------------------------
*From: * Paul Anderson <[email protected]>
*Date: *Tue, 23 Oct 2012 09:29:01 -0500
*To: *Discussion of biomass cooking
stoves<[email protected]>
*Cc: *Crispin Pemberton-Pigott<[email protected]>; Hugh
McLaughlin<[email protected]>
*Subject: *Re: [Stoves] Very small stoves and reheating food
Crispin and Alex and all,
Successful "dribble" or "trickle" feeding at very low cost will be a
great addition to small stove technology.
Of course gravity is the least expensive. But "assisted gravity"
might be relatively low cost. I am thinking of a small tapper or
vibrator that can be set to giggle the fuel chamber periodically or
when some sensor sends a signal.
Alternatively there could be some shape of rod that is inside the fuel
chamber. There are many ways to giggle/wiggle/twist/tap/lift/drop to
have minor movement of the rod to assure the gravity flow of the fuel
in the hopper.
Alex is doing it the right way: Start with uniform fuels like
pellets or quality (screened) wood chips. When a method works there,
then start looking at the more difficult fuels to make flow.
Paul
Paul S. Anderson, PhD aka "Dr TLUD"
Email:[email protected] Skype: paultlud Phone: +1-309-452-7072
Website:www.drtlud.com
On 10/22/2012 7:48 PM, Crispin Pemberton-Pigott wrote:
Dear Paul
Not too fast there… that is what is exciting about Alex English’s
dribble feeder (I am calling it because that is what it is doing). He
is successful so far with wood chips, pellets and by extension, any
small fuel like nut shells, coffee hulls etc.
I am going to have a gander in November. It is the first /small/
gravity feeder that I have seen work well. There is no reason it
won’t work with rice hull if we get a bit clever.
You fan (geddit)
Crispin
*++++++*
It is the words "feed ... continuously" fuel that is a problem. The
pellet stoves (heaters) are acceptable and successful because the
continuous feeding of fuel is automated. No such luxury with
inexpensive stoves for economically poor people.
Paul
_______________________________________________
Stoves mailing list
to Send a Message to the list, use the email address
[email protected]
to UNSUBSCRIBE or Change your List Settings use the web page
http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org
for more Biomass Cooking Stoves, News and Information see our web site:
http://www.bioenergylists.org/
_______________________________________________
Stoves mailing list
to Send a Message to the list, use the email address
[email protected]
to UNSUBSCRIBE or Change your List Settings use the web page
http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org
for more Biomass Cooking Stoves, News and Information see our web site:
http://www.bioenergylists.org/
