Use of spiral conveyor in the processing of granular waste materials
¹Czech University of Life Sciences Prague, Faculty of Engineering, Department of Technological Equipment of Buildings, Kamýcká 129, CZ 165 21 Prague 6 – Suchdol, Czech Republic
²Czech University of Life Sciences Prague, Faculty of Engineering, Department of Technological Equipment of Buildings, Kamýcká 129, CZ 165 21 Prague 6 – Suchdol, Czech Republic
The work presents a construction solution, verification of operation function and evaluation of the efficiency of a spiral separator in processing of agricultural, food industry and other granular waste. The common method of processing waste is based on crushing and subsequent sorting by various physical and mechanical properties. Crushing waste results in a heterogeneous mix of particles with a substantial size and weight difference and major share of dangerous powder particles. Thus, specific requirements are put on the conveying and manipulation of the mixture. The solution is using pneumatic conveying and closed sub-pressure separators. Under laboratory pilot conditions a sub-pressure spiral separator was designed and tested. The separator is designed as an immobile drum sieve in which a rotating axis-free helix is inserted. The inside space of the drum sieve is linked axially to the sub-pressure pipe of the combined conveyor. A light aspiration proportion (dust particles) are carried by the air flow while the granular particles with big specific weight and specified size make the sieve fraction. The particles larger than the separation apertures of the sieve are carried mechanically by the helix. The separating efficiency was observed on a mix of granular materials at same operation conditions. The contents of the mix of granular materials varied in size, specific weight and in the proportion of dust particles. Evaluation of the separating possibilities of the spiral separator verified the operation applicability of the system for separation and conveying of various agricultural, food and other granular materials.