Skip to Main content Skip to Navigation
Theses

Etude expérimentale du comportement des aérosols et de leurs dépôts dans un élévateur à godets : impact sur la contamination croisée en alimentation animale

Abstract : Carry-over of additives and/or medicated products is a common issue in feed industry and, by extension in most of powder handling industries. Currently carry-over rate of a production line can be accurately defined but the causes are not identified yet. It can be broken into 2 phases : firstly, particle deposit during one batch processing and then, their collecting during the following batches. Experimental studies, carried out on industrial sites or on test benches, charged the bucket elevator situated just after the mixer to be responsible for a significant increase of cross contamination rate of industrial feed production lines. Therefore this work focuses on this handling device. It transfers mixing of several raw materials in powdery forms, which may contain micro-ingredients, especially additives or medicated products. The aim of this study is to understand how process operations affect cross contamination rates during bucket elevator handling. A test bench of this handling device, a reference product and laboratory methods have been setup. Moreover, an experimental fractional factorial design highlights the effects of several process parameters : on one hand the discharge phase on elevator head (linked to belt velocity) and the discharge spout angle act on microingredients deposit mass. On the other hand, spacing between buckets and the leg’s inner surface influences micro-ingredients collected mass. Furthermore, ideal position of process parameters has been defined. By this way, cross contamination rate on the test bench has been decreased from 9 to 7 percent. Finally, velocity fields observations during the discharge phase leads to better understanding of how these process parameters influence cross contamination rate.
Complete list of metadatas

Cited literature [49 references]  Display  Hide  Download

https://tel.archives-ouvertes.fr/tel-00731654
Contributor : Abes Star :  Contact
Submitted on : Thursday, September 13, 2012 - 10:54:24 AM
Last modification on : Wednesday, October 14, 2020 - 3:58:02 AM
Long-term archiving on: : Friday, December 14, 2012 - 3:56:08 AM

File

Leloup_M_05_2012.pdf
Version validated by the jury (STAR)

Identifiers

  • HAL Id : tel-00731654, version 1

Collections

Citation

Marine Leloup. Etude expérimentale du comportement des aérosols et de leurs dépôts dans un élévateur à godets : impact sur la contamination croisée en alimentation animale. Génie des procédés. Ecole des Mines de Nantes, 2012. Français. ⟨NNT : 2012EMNA0013⟩. ⟨tel-00731654⟩

Share

Metrics

Record views

786

Files downloads

2638