Optimized separation

Modelling and application to emission control and value-added product recovery

System studied in this work

Iterative process concerning the processed particle size distribution

Information flow diagram to illustrate the internal operations of the electrical model

Representation of the interparticle agglomeration model

Representation of the integration of different models

Case 1 – Hurricane^® application example: Simulation of calcined kaolin: a) Particle size distribution (PSD) at the inlet of the system and in emissions (predicted by PACyc for Hurricane^®); b) Grade efficiency curves

Grade efficiency curves

Case 2 – ReCyclone® MH application example: Value-added product recovery: a) Particle size distribution (PSD) at the inlet of the system and in emissions (experimental); b) Grade efficiency curves

Grade efficiency curves

Case 3 – ReCyclone^® EH application example: Excess air of a clinker cooler: a) Particle size distribution (PSD) at the inlet of the system and in emissions (predicted by PACyc); b) Grade efficiency curves

Grade efficiency curves

Global efficiency for each of the cases: experimental and predictions

Summary

The development of the high-efficiency Hurricane^® and ReCyclone^® systems allows their application either for emission control or value-added product recovery. The purpose of this paper is to present not only the performance of these systems, but also a model to predict in a more realistic way the collection efficiency of a gas cyclone with or without partial recirculation. Some experimental results obtained in emission control and value-added product recovery are also presented, together with the corresponding PACyc predictions on grade and global collection efficiencies.

1 Introduction

Cyclones are gas-solid separation devices used in a wide variety of industries, mainly for the recovery of raw or process materials, as collectors for compliance with particulate emission limits, and as primary collectors to decrease the burden on more expensive secondary collectors. Cyclones are essentially attractive for operation at high temperatures and/or pressure, and the development of highly efficient cyclones, especially for fine particles below 2-3 μm in diameter, could have a significant impact in the chemical processing industries.

Based on a numerically optimized...

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Jlio Paiva
Advanced Cyclone Systems, SA.,
Porto/Portugal
www.acsystems.pt
julio.paiva@acsystems.pt

Romualdo Salcedo
Advanced Cyclone Systems, SA. und LEPAE,
Fachbereich Chemische Verfahrenstechnik der
Technischen Fakultät der Universität Porto
Porto/Portugal
www.acsystems.pt