[Stoves] coconut usage in improved stoves continued

[M. Nurhuda]

Dear All,

Perhaps gasifier/burner like this (see attached picture) can be used to
burn coconut husk easily.

It is an open-top gasifier, such that user can easily add fuel from the
top.  I also employed semi cyclonic system to filter the dusk.

That was three years ago.


Regards
M. Nurhuda


> Dear All
>
>
>
> I have spent some time trying to burn whole coconut husks – some may
> remember the reported experiments some time in 2003.
>
>
>
> The motivation was the fact that Mozambique has a huge amount of the
> material lying around and while it is used for a domestic fuel, it is
> pretty awful. It is heaped around pots and burned with a great deal of
> smoke.
>
>
>
> I was in Swaziland at the time (where New Dawn Engineering is located) and
> was developing the Vesto. A number of experiments were conducted using a
> Tsotso stove which can burn just about anything. The observations were
> that the husks can burn very cleanly (visibly clean, at least) if it is
> burning in a staged process. While the fuel can hold considerable
> moisture, once it is heated to the point of getting rid of the steam, it
> is able to burn well, producing a white smoke that supports combustion if
> given preheated secondary air.
>
>
>
> In order to sustain a burn it is essential that the fuel be dried enough.
> It is likely that any practical device will have a method of supply new
> fuel continuously or in batches, perhaps pushed in from the side or the
> bottom. Preheating the primary air is essential because of the retained
> moisture.
>
>
>
> Because the ‘fuel particles’ are so large, the device will have to be
> large. If it is a TLUD or downdraft (BLDD) stove it implies that he
> chamber will be >6 times the particle size. If the husks are not cut into
> pieces that implies a diameter of perhaps 60-75 cm. I guess the power
> level would 10-20 kW. To be useful the things should perhaps be 1.5-2
> metres high.
>
>
>
> At that size, it could be used to make soft charcoal on a reasonable scale
> for briquetting. Given the vast local market for charcoal in Mozambique it
> might make sense, all things considered.
>
>
>
> Regards
>
> Crispin
>
>
>
>
>
>
>
> Paul
>
>
>
> What would a TLUD sized for coconut husks look like? Can you suggest
> dimensions and a fuel size?
>
>
>
> Tom
>
>
>
>
>
>
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