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Improved Chulhas

A variety of biomass-based, efficient, smokeless chulhas have been developed, which are estimated to have efficiencies between 25 to 30 per cent. The fixed type chulhas have two or three pot-holes and the chimneys are made of bricks/stones and clay, pottery liners, etc. Portable chulhas are made of metal, metal-clad ceramic and metal-clad re-castable material. A chulha for high altitude has also been developed for cooking in colder Himalayan regions.

Biomass Gasification

The biomass gasifier converts fuelwood and agricultural residues into a 'producer gas' through a thermo-chemical process.This producer gas contains, by volume, 13-15% hydrogen, 18-25% carbon mono-oxide, 5-10% carbon dioxide and 48-54% nitrogen. Its calorific value is 5,500kJ/Nm 3. It can be used in burners and boilers and also in dual-fuel engines where it is first cleaned to remove particles of tar and then cooled.

Biomass Briquetting

Biomass Briquettes made through manual process can be used for cooking as fuel in homes, whereas those produced through mechanical presses can be used in biolers and furnaces.
 

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