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

[Kevin Chisholm]

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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