[Stoves] big TLUD

[biocharFIRST .]

I don't know how big you can build a TLUD.  However about three years ago I
built a 350 gallon TLUD that is working out very well, except for the fact
that we do not have a use for the sen gas where the TLUD is now located at
my home.  You can see a video at, vhttps://www.youtube.com/watch?v=5Kfr4NRhJ0s.


Currently we have almost completed a 500 gallon TLUD that is designed to
exhaust  all of the sen gas down a tube in the center of the tank so the
heat from the gas can easily be captured for various uses.
r be uniformly dry, and the larger the diameter of the TLUD, the greater
the chance that the pyrolysis front will not reach the hearth in all areas
at the same time.  If this happens you risk overheating tha hearth if you
wait for all the fuel to pyrolyse and burn some of the biochar.  If you
shut off the primary before pyrolysis is complete you will get some smoke
and some biomass that is not completely pyrolysed.

On Thu, May 14, 2015 at 4:46 PM, Crispin Pemberton-Pigott <
crispinpigott at outlook.com> wrote:

> AJH >Yes and/or premixing but why does burning rice hulls tend more to the
> blue flame?
>
> Lower volatiles? The carbon/hydrogen ratio is not the same as wood. Maybe
> that helps.
>
> Apparently the reactions can be shifted from CO to H2 by using different
> catalysts:
> Crispin
>
> From http://www.sciencedirect.com/science/article/pii/0141460786900727
>
> Catalytic gasification of rice hull and other biomass. The general effect
> of
> catalyst.
>
> Abstract:
> Thermochemical decomposition and catalytic conversion of rice hull and some
> other cellulosic materials in a fluidized bed reactor containing different
> catalysts as the bed material were studied. The use of catalyst invariably
> gave gas yields above that of the non-catalyzed gasification process and
> also changed the product distribution according to the nature of the
> catalyst. Generally, an acidic catalyst favored the formation of carbon
> monoxide and olefins while a supported-metal catalyst increased the amounts
> of hydrogen and carbon dioxide. Nickel catalyst yielded as much as 60%
> hydrogen at a reaction temperature of 650°C. The gas yield and product
> distribution are mainly decided by the properties of the catalyst and less
> by the properties of the biomass.
>
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