[Stoves] Help with rocket stove for Cameroon

[Crispin Pemberton-Pigott]

Dear Michael

 

There are a couple of other alternatives in use. One is the grate developed
by the Rocketworx people in Durban. This seems to be very effective at
getting the char burned to ash with very little remnant (means high energy
from available fuel).  The other is the Improved Keren Stove which was
developed at YDD in Indonesia in 2012 that has a tilted grate, very low to
the floor. It is about 20mm high on the near (fuel feed) side and 40mm at
the back. This also has an air entrance at the back about 20 x 40mm
(rectangle). The grate bar spacing is important, as is the shape.

 

This also burns virtually 100% of the fuel put in. The additional
modification to the Keren stove is to lower the pot significantly on the
stove body to serve as an excess air controller. The traditional pot rest
height was FAR too high - about 25mm.  At 7mm it controls the excess air to
a reasonable level.

 

The combination plus one other modification increases the thermal efficiency
from ?16% to ?33%.

 

Regards

Crispin

________

 

 

Very important issue ---- 

 

"The proposed modifications included the possibility of using an air inlet
that is separated from the firewood magazine (bypass air inlet). With this
modification, the firewood magazine is built in such a way that it suspends
the burning tips of the firewood above the bypass air inlet, to simulate the
function of the firewood shelf."

 

I have seen sheet metal, wire, rod shelves burn rust and disintegrate
leaving the rocket a stove owner with little choice but to use without.

 

Michael N Trevor

Majuro

Marshall Islands 

 

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