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Porto, Portugal

Paiva J.,University of Porto | Salcedo R.,University of Porto | Salcedo R.,Advanced Cyclone Systems | Araujo P.,CUF Quimicos Industriais
Chemical Engineering Journal | Year: 2010

The purpose of this work is to build a model to predict in a more realistic way the collection efficiency of gas cyclones, and in particular, of numerically optimized cyclones, that show very high collection efficiencies for sub-micrometer particles. These cyclones can be coupled to recirculation systems for further improving the collection efficiencies of these fine particles.As a first approach, in this paper a reverse-flow gas-cyclone without recirculation was studied. The model starts by solving the particle trajectory in a predetermined flow field inside the cyclone on which turbulence is superimposed by adding random fluctuating components. By employing a fixed set of parameters, it determines if a collision or an agglomeration occurs. In case of agglomeration, the initial particles will have a dynamic behavior inside the cyclone as an newly formed agglomerate, thus having a different collection efficiency from that of the original particles. In fact, the observed efficiency will increase above theoretical predictions for un-agglomerated particles and this can be observed in various experimental results.The hypothesis of particle agglomeration within the cyclone turbulent flow seems a sound justification for the higher than predicted collection efficiencies observed for smaller particles in a gas-cyclone, being expectable with recirculation that this effect will become even more significant. © 2010 Elsevier B.V. Source

Chibante V.G.,University of Porto | Fonseca A.M.,Fernando Pessoa University | Salcedo R.R.,University of Porto | Salcedo R.R.,Advanced Cyclone Systems
Journal of Hazardous Materials | Year: 2010

A mathematical model describing the dry-scrubbing of gaseous hydrogen chloride (HCl) with solid hydrated lime particles (Ca(OH)2) was developed and experimentally verified. The model applies to cyclone systems with and without recirculation, where reaction and particle collection occurs in the same processing unit. The Modified Grain Model was selected to describe the behavior of the reaction process and it was assumed that the gas and the solid particles flow in the reactor with a plug flow. In this work, this behavior is approximated by a cascade of N CSTRs in series. Some of the model parameters were estimated by optimization taking into account the experimental results obtained. A good agreement was observed between the experimental results and those predicted by the model, where the main control resistance is the diffusion of the gaseous reactant in the layer of solid product formed. © 2010 Elsevier B.V. Source

Advanced Cyclone Systems | Date: 2010-10-12

Cyclone separators for industrial use; industrial de-dusting apparatus, namely, dust separators for particles, dust, and granular material; centrifugal, cyclone separators for separating solids from combined streams of gases and solids derived from industrial processes, motors or boilers. Ventilation installations, namely, separators for the filtration of particles and bacteria from gases; filtration installations and apparatus, namely, air filters for domestic use, industrial air filter machines; ventilation installations, filters and separator elements for gaseous streams, namely, air filters for industrial installations, separators for the cleaning and purification of gases. Construction, maintenance, and repair of industrial installations, engineering pollution controls, and installations for treating and dedusting gases; building construction, maintenance and repair of apparatus and installations for ventilation and filtering of gaseous streams, namely, air. Engineering; technical research, namely, scientific research, industrial research in the field of gas solid separation; conducting of technical project feasibility studies; technical consultancy services in the field of environmental science; expert engineering services, namely, providing engineering reports; design and development of computer programs; installation of computer programs; maintenance of computer programs; quality control services for others, namely, quality control of gaseous streams in terms of environmental specifications; technical environment consultancy services, namely, consultancy in the field of gas-solid separation.

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