[Stoves] Briquette ignition in a Vesto Junior

Crispin Pemberton-Pigott crispinpigott at gmail.com
Thu Aug 2 15:02:12 CDT 2012


Dear Briquette-Burning Friends

 

George of the Jungle in the Gambia has provided some pretty interesting
photos of the ignition and development of a fire in a Vesto Junior. The fuel
is a hardwood sawdust bound by shredded, soaked typing paper. The fuel was
made in a press designed by Richard Stanley.

 

The important dimensions are that the combustion chamber is 125mm in
diameter and the briquette is 110mm. They are about 75 mm high. Burning two
at a time (it can stack 3) looks like this:

 

Description: cid:image009.jpg at 01CD70C7.93854540

 

Description: cid:image010.jpg at 01CD70C7.93854540

 

Description: cid:image011.jpg at 01CD70C7.93854540

 

Description: cid:image012.jpg at 01CD70C7.93854540

 

Description: cid:image013.jpg at 01CD70C7.93854540

 

Description: cid:image014.jpg at 01CD70C7.93854540

 

The fire is a combination of a gas production zone with restricted primary
air and a secondary air supply zone, with enough clearance around the
briquette to prevent the outside of the fuel being kept away from the fire.
If the briquette is tight in the chamber, it does not burn properly at a
decent rate. Basically, it has to breathe.

 

The flame space is sufficient to allow the combustion to be mostly completed
before the hot gases hit the pot.

 

George will report later on the burn rates, fuel savings and cooking
efficiency.

 

Regards

Crispin

 

PS A Vesto Junior is a Vesto without an air controller. This project was
designed around a humid tropical environment, locally produced biomass
briquettes and a stove that will be largely manufactured locally to a
specified design.

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