The Anila stove which was fabricated in India was tested 17.08.2010.
The results are available on bioenergylists.
The ARTI team were able to make some suggestions, to refine the design. These were:
– Adding a mud seal along the join of the main unit to the base plate, this stopped the gases from the biochar production from escaping. This was simply some mud which is smeared around the join
– Addition of a ‘pot raiser’. The stove was also observed to become smoky once the pot was added, a pot raiser was added to the unit, which reduced the amount of smoke which was.
– Making the holes smaller…After getting the units from the artisan the researcher suggested to increase the size and number of holes in the unit, however after testing, it was found that the flames were high – partly due to excess air flow up through the combustion chamber. (during trials with the smaller holes this did not impede the production of biochar).
The flames from the Anila are derived from the combustion of the wood (in the central combustion chamber), and also the gas (from gasification of the biomass in the outer chamber) which is able to travel out from the holes (in the lower part of the central column) into the combustion chamber.
Even with the adjustments, there was still some smoke produced from this unit, so as in Cambodia, it will be recommended that the testers use the stove in an outside location / or in a well ventilated room.
Generally the stove worked well, and we were able to make biochar from sugarcane trash and tree waste (Casurina equisetifolia).
The next step is testing in the household…