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Triple Cone Stove Burning Ricehulls & Woodsmoke by Herman Johannes
Ricehulls are poured through the 3cm slit between cone A. and cone B. When woodshavings or other combustible material are dropped on this surface and ignited then this layer of hulls will catch fire and burn. Cone B. becoming incandescent will scorch the hulls in contact with it. Smoke from the burning hulls together with outside air will be sucked into B and bum off. The cooking pot may be placed on B's mouth without using cone C, but a better thing to do is to seat cone C in the mouth of A and place the cooking pot on C's mouth. In this case smoke generated outside cone B and eventually not sucked into it will be compelled by cone C to flow to the top of B and burn off. The stove used as a hybrid stove burning ricehulls and woodsmoke while producing charcoal (Fig 2) The stove described may easily be converted into a hybrid stove using not only ricehulls but also woodsmoke while producing charcoal. The wood smoke is produced in a woodsmoke reactor placed on the three consoles within cone B. This reactor is nothing more than a spent milk tin of l0cm diameter and 15cm height, filled with pieces of hard wood.
Eight holes of I mm diameter are nailed at the periphery of the tin's bottom at/owing woodsmoke to spurt in jets through them onto the incandescent layer of ricehull char on A's floor. This smoke then bums directly to CO2 and H2O or after being converted first to producer gas CO + H2. The reactor put in a wire cage can be lowered into or pulled out of B by a wire with a hook at its end. The reactor being put in the burning ricehull stove will be heated up and the wood within will be pyrolysed to charcoal and smoke. The glowing charcoal in the tin cannot bum to CO2 and ash because the air in it has been expelled by the smoke generated while air is prevented from entering by the jet of smoke. Even if the outflow of smoke has ceased because the pyrolytic reactor has ended, the charcoal produced cannot bum to ash because the little air that may enter the tin will produce some CO2 that will not support combustion. Smoke is regarded as a health hazard and hence it is discarded through chimneys in many stoves and in fireplaces burning wood for space heating in temperate zones. Discarding smoke into the air is not the best way of getting rid of it because of environmental pollution and wasting of energy. Smoke consists of combustible hydrocarbons such as tar containing methanol, acetone acid plus CO, H2, CH4 and carbon particles. Smoke contains about 55% of the heat of combustion of wood. A better way of getting rid of smoke is to use it as a fuel as is done in the hybrid stove described. A larger triple cone ricehull stove made of clay or of steel plate with a clay inner cone or pipe may be used for drying tobacco or other agricultural products. [top] [end]Contents: Boiling Point 28: Biomass Combustion, Chimneys & Hoods
Categories: Boiling Point 28| Biomass Combustion, Chimneys & Hoods | |||||||||||
Page created:
18 July 2008; Last edited:
08 September 2008; Version: 0 | |||||||||||
Pagename: TripleConeStoveBurningRicehullsAndWoodsmoke @HEDON: DMMA | |||||||||||
