[Stoves] [Gasification] Heating/thermal usage - China workshopnotes

[Ken Boak]

Kevin & List,

It's quite simple (easier said than done perhaps) , you have to provide a
mechanical means that replenishes the fuel from the underneath or side at a
rate that matches the burn down rate.

Think of it like a rocket stove but with an auger that feeds the fuel in
from the side, such that the combustion and pyrolysis zones remain almost
stationary towards the top of the gasifier.


Ken


----- Original Message ----- 
From: "Kevin Chisholm" <kchisholm at ca.inter.net>
To: "Ken Boak" <kenboak at stirlingservice.freeserve.co.uk>; "Paul S. Anderson"
<psanders at ilstu.edu>; "GASIFICATION - Listserve"
<GASIFICATION at listserv.repp.org>; "ARECOP - Listserve"
<arecop at yahoogroups.com>; "STOVES - Listserve" <STOVES at LISTSERV.REPP.ORG>
Cc: "ARECOP secretariat - Asia - Indonesia" <secretariat at arecop.org>; "H S
Makunda - IISc - India" <makunda at cgpl.iisc.ernet.in>; "C S Bhaskar Dixit -
IISc - India" <dixit at cgpl.iisc.ernet.in>
Sent: Sunday, August 06, 2006 7:03 PM
Subject: Re: [Stoves] [Gasification] Heating/thermal usage - China
workshopnotes


> Dear Ken Et Al
>
> The T-LUD is indeed a neat piece of equipment, and it certainly works well
> for a heating application of short duration.
>
> I must be missing something, but I can't see a simple way to operate a
T-LUD
> stove on a continuous basis. If more fuel is added on the top surface of a
> T-LUD fuel bed, it then becomes a "Thin Bed Updraft Gasifier", a "TBUG".
>
> It seems to me that the essence of a T-LUD is that there is no fuel above
> the primary reaction zone, where the fuel is gasified, and that it is
close
> coupled to a secondary zone, where gases are burned to completion.
>
> Would someone be able to explain how a device that was started up as a
T-LUD
> could be operated on a continuous basis as a T-LUD?
>
> Thanks.
>
> Kevin
> ----- 
> > Paul,  Stovers and gasification enthusiasts,
> >
> > Thankyou for your report on the proceedings of the ARECOP workshop.
Most
> > interesting reading.
> >
> > It appears to me that applications 3,4,5 and 6 (below) could be met with
a
> > T-LUD gasifier of between 20cm and 30 cm diameter.
> >
> > Might this be a common designed element for these projects that could be
> > optimised and shared amongst the participants?
> >
> > regards
> >
> > Ken Boak
> >
> > London
> >
> >
> >> 3.  Abdul Shakoor Sindhu of Pakistan is looking to have relatively
small
> > T-LUD
> >> gasifiers provide the heat for the tandoor (tandoori) ovens that are
used
> > to
> >> bake roti and other things.
> >>
> >> 4.  C. K. Kumarswamy of Bangalore, India, is focused on the relatively
> > large
> >> cookstoves of the roadside restaurants.  High heat is needed for
several
> > hours
> >> at 3 meal times per day.  Fuel consumption currently is about 3 kg of
> >> wood
> > per
> >> hour per stove (number of pots per stove is not in my notes.).  Some
form
> > of
> >> T-LUD is to be used.
> >>
> >> 5.  From two different cities (500 km apart) in Indonesia, Dang
> >> Tanoewiangga and
> >> Hermanto Sudjarwo are interested in two food products made from palms.
> > Both
> >> products involve boiling away the water.  One is to make palm oil from
> >> palm sap
> >> collected from the trunks of some palm trees.  The other is to make
> > coconut
> >> brown sugar from the juice of the white coconut meat (copra).  These
use
> >> round-bottom pots of about 30 - 40 liters, and are stirred almost
> >> constantly to
> >> evaporate about 24 kg of water, leaving about 6 kg of oil.  T-LUD
> >> gasifiers with
> >> fuel chambers of 20 cm Diameter x 70 - 90 cm Height (or 30 cm D x 50 -
> >> 70 cm H)
> >> are recommended for the approximately 4-hour process that currently
uses
> > about
> >> 2 kg of wood per hour.
> >>
> >> 6.  Rajan Thapa of Nepal explained the seasonal production (Dec to
March)
> > of
> >> Lapsi candy made from fruit.  The 100 liter pots (half-barrel of 55 gal
> > drums)
> >> need to come to a boil and then simmer, for a total of 2 hours.  The
> >> calculated
> >> size of the fuel chamber of an appropriate T-LUD gasifier is 30 cm D x
> >> 35 cm H.
> >> (We hope to have a taste of the Lapsi candy and the coconut brown sugar
> >> at
> > the
> >> 2007 meeting in Bangalore.)
> >
> >
> >
> >
> > _______________________________________________
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>
>
>