Hurricane and ReCyclone® systems: Modelling and application to emission control and value added product recovery

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The development of high efficiency Hurricane® and ReCyclone® systems allows their application either to emission control or to 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.

ReCyclone® systems consist in an optimized reverse-flow cyclone (collector) combined with partial recirculation of un-captured particles via a straight-through cyclone (concentrator). As in improvement of the ReCyclone, it is possible to include a DC electric field in the concentrator to enhance even further particle recirculation to the cyclone collector, leading to higher collection efficiencies.

To model the system, a computer program (PACyc - Particle Agglomeration in Cyclones) was developed. which starts by estimating the collection efficiency of a system without agglomeration, relying on previously published models to predict collection efficiency either for isolated cyclones or for cyclones with mechanical/electrostatic recirculation.

Some experimental results obtained in emission control and value added product recovery are presented, together with the corresponding PACyc predictions on grade and global collection efficiencies.

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