[Stoves] FW: Need designs

[Alex English]

When I was testing a  Rocket Stove back in the 90s I pulled out the fuel 
support and tossed chips into a pile in the back of the stove. It made a 
nice starved pile with a good gas cloud and flame on top. Almost all the 
air became secondary air. Had there been a down leg or sealed container 
below the stove with a small hole in the floor of the Rocket stove that 
you could nudge the char into it could have been continuous. Most 
striking was the fact that the CO/CO2 ratio was much better than I could 
achieve under normal operation.

Try it.
Alex


On 17/09/2012 3:09 AM, mtrevor wrote:
> Dear Crispin
> Thanks for noting this.  It was also clearly illustrated on the 
> stoves list several years back
> in the article on introducing the Approvecho/Stovetec unit in the 
> Marshall Islands. While the amount of char produced is small it
> definitely does product char.
> Michael N Trevor
> Majuro
> Marshall Islands
>
>     ----- Original Message -----
>     *From:* Crispin Pemberton-Pigott <mailto:crispinpigott at gmail.com>
>     *To:* 'Discussion of biomass cooking stoves'
>     <mailto:stoves at lists.bioenergylists.org>
>     *Sent:* Monday, September 17, 2012 3:36 PM
>     *Subject:* Re: [Stoves] FW: Need designs
>
>     Dear Ron and Aron
>
>     A Rocket stove typically makes quite a bit of charcoal and that is
>     one reason why you should put a grate in, if you plan to save
>     fuel. The ends of the sticks fall off long before the charcoal is
>     burned and sit in a pile on the floor of the combustion chamber.
>     Whatever happens not to burn, is lost later.
>
>     If you want to make additional charcoal put in a grate with a
>     small number of 8mm holes in it, of 6mm. This will cut off most
>     primary air and cause the creation of a much larger (about double)
>     the amount. The Namibian Tsotso is a stove which is built exactly
>     like that. It creates charcoal so effectively that towards the end
>     of a WBT it hard to get additional fuel in because of the pile of
>     char. It could in theory burn at least some of it but it is not
>     really set up to do so. If you do add such a grate, it is, by
>     definition, a not Rocket Stove (which always has overhanging fuel
>     and air supplied from underneath).
>
>     The Institutional Lion Stove, which is basically a Rocket Stove
>     with preheated primary air, also makes a lot of char, until it
>     fills the lower combustion chamber. This then acts as a simmering
>     fuel charge and all the firewood can be removed. I have seen a
>     stove with a 70 litre pot simmering for ages (more than an hour)
>     using on this cube of char what was blocking the primary air
>     entrance up level to the fuel shelf (which is made of brick).
>
>     In fact I found a photo of that very stove which is at an orphan
>     feeding station in Moneni, Swaziland. There is no firewood in the
>     chamber at all. The stove saves about 70% of the fuel in part
>     because of this.  If you are wondering what the metal rings are on
>     the top, the pots are chained to the stove to prevent them growing
>     legs. They already have three feet so they tend to go walk-about.
>
>     Xavier on this list has been making similar stoves in Benin. A
>     complete description of how to make it is in the NDE library at
>     http://www.newdawnengineering.com/website/library/Stoves/lionstove/
>
>     Regards
>
>     Crispin
>
>     Aron:
>
>        Can you clarify your intended design?  I know of no way that
>     you can turn a rocket stove into a char-making stove (but would
>     love to hear differently).
>
>     Ron.
>
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