ECHANGEURS THERMIQUES A CYCLONES
The study discusses cyclones situated in a preheater tower above a cement kiln. This preheater insures the thermal preparation of the material by a counterflow heat exchange between the stream of cold material descending towards the kiln and the hot gaz drawn up towards the top of the tower by fans. The purpose is to reduce the energy consumption in the preheater tower; energy can be saved by diminishing the power consumed by fans and bvy a better use of the heat brought by the gas. The efficiency of the thermal exchange is affected by the separation efficiency of the cyclones. However there is a lack of information about internal working parameters of these separators (separation efficiency, pressure drop, retention time of the material in the cyclones, etc...) since a suitable method of investigation was not available. An experimental method has been perfected, using radioactive tracers in order to investigate these parameters. A computer programme has been designed and evaluated by the experimental data. This programme has been used to optimize the cyclone geometry for a better separation efficiency and a lower pressure drop. An economic assessment shows that the profit is too small to justify alteration of a plant already working. But improvement of cyclones geometry shape with the help of the computer programme can be considered for future fittings.
Références bibliographiques: EUR 8862 FR (1984) MF, 147 P., BFR 120, BLOW-UP COPY BFR 735, EUROFFICE, LUXEMBOURG, POB 1003
Disponibilité: Can be ordered online
Numéro d'enregistrement: 1989122055900 / Dernière mise à jour le: 1987-01-01
Langues disponibles: fr