Biomass rake (RBR) and firing equipment for straw and similar fuels
Straw fuels which have been pressed into big bales must be loosened to a suitably low density to prepare them for combustion on a grate. For this purpose we have developed and patented a special rotary biomass rake, the RBR.
In combination with a heavy duty double screw-feeder with a water-cooled trough, this is a unique piece of equipment with a high capacity, suitable for a wide spectrum of fuels.
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The design
The big bales are brought from the barn to the boiler house via a number of chain conveyors, one formed as an air sluice.
At the entrance of the biomass rake, the bales are fed by a speed-controlled conveyor towards the first and smaller of two toothed drums called the dosing drum. The teeth of this drum seize the bottom of the first wad and disengage it from the remaining bale.
The wad will follow the drum approx. 1/3 turn before the teeth of the dosing drum engage with the teeth of the second and larger drum called the raking drum. Because of its higher peripheral speed the raking drum loosens the straw to a density proportional to the distance between the drums and the relative difference in speed.
The loosened straw will fall down into a heavy duty double screw-feeder mounted in a water-cooled tray. The chute between the rake and the feeder is equipped with a water cooled sliding fire damper.
The stoker will slightly compress the straw through a water-cooled tunnel and deliver it through the front wall of the boiler to the combustion grate.
The fuel compression in the tunnel provides security against uncontrollable entry of false air to the furnace.
