Tag Archives: granular waste.

1099–1106 J. Sander and T. Jehlička
Use of spiral conveyor in the processing of granular waste materials
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Use of spiral conveyor in the processing of granular waste materials

J. Sander¹* and T. Jehlička²

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
*Correspondence: sander@tf.czu.cz

Abstract:

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. 

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83-88 T. Jehlička and J. Sander
Use of combined pneumatic conveying in the processing of granular waste materials
Abstract |
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Use of combined pneumatic conveying in the processing of granular waste materials

T. Jehlička* and J. Sander

Czech University of Life Sciences Prague, Faculty of Engineering, Department of Technological Equipment of Buildings, Kamýcká 129, 165 21 Prague 6 – Suchdol, Czech Republic; *Correspondence: jehlickat@tf.czu.cz

Abstract:

This paper focuses on the structural design, verification and operational functions of combined pneumatic and mechanical transport systems in processing granular materials. A pilot plant was designed in laboratory conditions, and the combined pneumatic and mechanical transport system was tested in operation. Subsequently, transport possibilities for granular waste materials, which varied in size and specific particle weight, were evaluated. A combined pneumatic and mechanical transport system was designed as a transport line for pneumatic conveying at low pressure in combination with a mechanical towing component. The combination of both modes was designed so that the towing component in the form of an axis-less helix was inserted into the conveying pipe. Transport efficiency was monitored by comparing common pneumatic transport and combined pneumatic transport (pneumatic and mechanical transport). Both systems were tested under the same operating conditions with various granular waste materials, which varied in size and specific particle weight. Crushed electric waste was used as granular material to assess the operational functions used. Properties of the proposed transport system were tested by constructing and operating the system. The evaluation of transport options featuring pneumatic and combined (pneumatic and mechanical) transport systems proved that the system was reliable and highly efficient for the transportation of dry granular waste.

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