[Stoves] small unit feeding continuously is not a small idea

[Crispin Pemberton-Pigott]

Dear Richard

It think it is a crossflow fire, as Alex has built it. I have tried the closed and open approach on the same stove, with the design being a proper crossdraft. When the hopper is open the air roars through the system. When closed, heated gases rise and accumulate in the hopper. This can lead (and did) to a lot of combustion taking place in the hopper if the hot gases can circulate vertically. The pyrolysation is fed by fuel oxygen. 

It is possible for the accumulated gases to explode, as Alex found out (he can tell that story). 

Your description of the feed rate is interesting. If it overcomes the tendency for really hot air to go up it will work I guess. I found out that chipped wood is really cheap here. A chip feeder might work for some applications. 

Regards
Crispin in Jakarta
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From: Legacy Mail <rstanley at legacyfound.org>
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Date: Wed, 24 Oct 2012 08:58:26 
To: Discussion of biomass cooking stoves<stoves at lists.bioenergylists.org>
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Subject: [Stoves] small unit feeding continuously is not a small idea

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