Rotary spool feeder for biomass dosage
2007
Kakitis, A. | Nulle, I.
Relevant resources for renewable biomass fuel production are wood, cereal straw residues, and emergent vegetation from wetlands. Peat is also an important slowly renewable biomass fuel. Using blended peat and woody or herbaceous biomass, sulphur content of the fuel is increased and if the mixture is burned sulphates are formed instead of chlorides, and the risk of high temperature corrosion is avoided. For in-flow mixing, accurate feeding is necessary. In this paper the problem of a steady and measured feeding of chopped biomass is analyzed. Dependence of dosage accuracy on angular velocity of rotary spool feeder is stated for peat. The specific computerised data acquisition system for measuring dynamic mass flow and angular velocity of feeder was worked out. Load cell for flow measuring showed good repeatability in dependence on flow intensity therefore it could be used for flow control in automatic regulation systems. The throughput of a spools' feeder is dependent on rotation frequency and rotation direction of spools. The throughput difference between rotation directions 1 and 2 is approximately 3 times at frequency 8se-1.
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