Evaluation of drum feeders for biomass dosage
2008
Kakitis, A., Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Engineering. Inst. of Mechanics | Nulle, I., Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Engineering. Inst. of Mechanics
As the fossil fuel resources are decreasing, in future we will have to rely on renewable energy sources. The most significant part (74 %) of renewable energy sources has been planned for biomass energy in European Union. The main resources for solid biofuel in rural area of Latvia are wood, residues of cereal crops, peat and emergent vegetation in lakes as common reeds (Phragmites australis). Straw more than 340 000 t annually can be used for heat production. More than 230 million tons of peat is available for biofuel production which is also an important slowly renewable biomass fuel. For in-flow mixing of biomass components, 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 drum feeder is stated for peat and chopped straw. The specific computerized 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 measuring in automatic control systems.
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