[Stoves] Re: blue flame observations in TLUD rice husk gas stove

[psanders at ilstu.edu]

Stovers,

The following is from Alexis Belonio.  He is not subscribed to the Stoves list
serve, so please include his address in any replies that you send.

Alexis, please tell us more about the amounts of primary air that give 
the best
gases.  I suspect that a moderate to strong flow of primary air is best.  If
really strong flow, than what is observed?  And if a low flow, what is
happening?  So far you are the only person who has these observations, so your
details are important.

Tom Reed, I still do not know why you say that blue flame is not better 
than the
yellow flame, or however you choose to say it.  Please elaborate.

Paul

Quoting alexis belonio <atbelonio at yahoo.com>:

> Dear Paul,
>
> Thanks for the email and the info re blue flame from
> gasification of biomass!
>
> In my previous experiments on TLUD rice husk
> gasifiers, I found the following factors contributed
> in producing a bluish flame color:
>
>   1. The fuel itself - Only rice husk was found to
> have a bluish color in the stove.  I tested wood
> chips, corn cobs, and dried leaves. The rice husk
> produced the bluish color of almost 80 to 90% followed
> by crumbled dried leaves  of about 60 to 70% then corn
> cobs of 30-40%, and wood chips of 5-10%.
>
>   2. The moisture content of rice husk fuel - Based
> on my several tests, drying rice husk in the sun for
> half a day produces a better flame (more bluish)than
> rice husk which is not subjected to drying before
> fuelling.
>
>   3. The type of burner used - The design of the
> burner also affects the color of the flame.  The
> cylindrical type cover produces a better flame than
> the conical cover.  This can be attributted either to
> the distribution of secondary air or the preheating
> effect of air prior to combustion.
>
>   4. Amount of char in the reactor - The amount of
> char also affects the color of the flame. During the
> first few minutes, the color of flame is less bluish
> than on the later stage of the stove operation.  This
> is because more char layer is present in the stove in
> the later part of operation than in the earlier part,
> that improves gas generation.
>
>   5. Amount of air flow - Adjusting the amount of air
> during gasification can provide the right color of the
> flame during gasification.  I observe this in the
> single as well as in the remote burner stoves.
>
> These observations might not be true to other biomass.
> The stove itself should be tested and experiments must
> be done.
>
> Alexis
>


----------------------------------------------------------------
This message was sent using Illinois State University Webmail.