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

[Paul S. Anderson]

Kevin and all,

Alexis Belonio uses the 2 fuel-chamber approach very well.

Personally, I like to have two fuel canisters that can be switched in and out
for sequentially continuing heat without continuous feed of fuel.  But this
applies only to the small small units where the canisters are small enough to
be manually exchanged.

Finally, the best reply about continuous-feed of a T-LUD could be to have some
other type of gasifier that is continuously operated.  I showed such a
prototype at the ETHOS 2006 meeting, and I will be bringing an improved 
unit to
Stove Camp.  It is a "traditional" updraft gasifier (with both pyrolyic
gasificaton and carbon gasification) with the fire at the bottom and fuel
coming in at the top.  It is NOT a pyrolytic gasifier, so I refrain from
calling it a B-LUD, or even worse, a BLUD gasifier.

By the way, a "B-LUD" pyrolytic gasifier does not work.  When the fire 
is lit at
the bottom of a full pile of fuel, the heat generated does not drive off the
combustible gases (via flaming pyrolysis or retort action) UNTIL AFTER the
moisture of the fuel pile has been evaporated.  That means that the quality of
the gases would be mainly water vapor at the beginning and then make a 
shift to
the combustible gases, resulting in an inconsistant supply of usable gases for
the fire.  I learned this from Alexis Belonio during the China workshop.  Once
stated, it seems to be self-evident (unless one forgets about the moisture in
fuels).

I will still be making a third report from the China workshop about 
gasification
technologies seen and not seen.

Paul

-- 
Paul S. Anderson, Ph.D., Geography professor - Emeritus
Telephone:  USA-309-452-7072 (residence and office)
Internet site:  www.ilstu.edu/~psanders
For my gasifier stoves info, go to:
http://bioenergylists.org/contributors#Paul_Anderson


Quoting Alex and Christine English <english at kingston.net>:

> Kevin,
> One possible way would be to have two or more fuel chambers connected 
> to a single
> burner. A flap valve would allow the transition from the spent 
> chamber to the newly
> ignited one.
> Alex
>
>> 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,
>> >
>> > Thank you 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
>>

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