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Published on: July 10, 2016
Optimization of bubble column performance for nanoparticle collection
M C Cadavid-Rodriguez1, A Charvet2, D Bemer3
1Université de Lorraine, Laboratoire Réactions et Génie des Procédés, UMR 7274, Nancy F-54000, France; CNRS, Laboratoire Réactions et Génie des Procédés, UMR 7274, Nancy F-54000, France; Institut National de Recherche et Sécurité (INRS), Vandœuvre-lès-Nancy F-54519, France.
Bubble columns offer a constant pressure drop alternative to fibrous filters for ultrafine particle collection. Optimal performance requires large liquid height and small bubble orifices, with granular beds enhancing efficiency.
Area of Science:
- Environmental Engineering
- Fluid Dynamics
- Particle Technology
Background:
- Fibrous filters are effective for ultrafine particle separation but suffer from clogging and pressure drop issues.
- Clogging necessitates frequent maintenance, increasing operational costs and downtime.
- Alternative filtration methods with constant pressure drop are needed.
Purpose of the Study:
- To investigate bubble columns as an alternative to fibrous filters for ultrafine particle collection.
- To evaluate the impact of operating conditions on bubble column collection efficiency.
- To compare the performance of bubble columns with traditional fibrous filters.
Main Methods:
- Experimental investigation of bubble columns under varying liquid heights, air flow rates, and bubble sizes.
- Assessment of the effect of granular beds on particle collection.
- Comparison of collection efficiencies with established fibrous filter data.
Main Results:
- Bubble columns demonstrate high collection efficiency with large liquid height and small bubble orifices.
- Collection efficiencies of bubble columns were found to be lower than those of fibrous filters.
- Gas velocity had a minimal impact on collection efficiency.
- Incorporating a granular bed increased bubble residence time and enhanced collection efficiency.
Conclusions:
- Bubble columns are a viable alternative to fibrous filters, particularly when constant pressure drop is critical.
- Optimizing liquid height and bubble size is key to maximizing bubble column efficiency.
- Granular beds significantly improve bubble column performance for particle collection.
