Removal of fine particles


Removal of fine particles (smaller than 2.5 microns) from industrial flue gases is, at present, one of the most important problems in air pollution abatement. These particles, which are hazardous because of their ability to penetrate deeply into the lungs, are difficult to remove by conventional separation technology. Sonic energy offers a means to solve this problem. The application of a high-intensity acoustic field to an aerosol induces agglomeration processes which changes the size distribution in favor of larger particles, which are then easier to precipitated with a conventional separator. It consists of an acoustic agglomeration chamber with a rectangular cross-section, driven by four high-power and highly directional stepped-plate transducers of 10 and/or 20kHz.


Removal of fine particles (smaller than 2.5 microns) from industrial flue gases is, at present, one of the most important problems in air pollution abatement. These particles, which are hazardous because of their ability to penetrate deeply into the lungs, are difficult to remove by conventional separation technology. Sonic energy offers a means to solve this problem. The application of a high-intensity acoustic field to an aerosol induces agglomeration processes which changes the size distribution in favor of larger particles, which are then easier to precipitated with a conventional separator. It consists of an acoustic agglomeration chamber with a rectangular cross-section, driven by four high-power and highly directional stepped-plate transducers of 10 and/or 20kHz.

The aglomerator has been characterized in a semi-industrial installation by using a fluidized bed coal combustor as fume generator with gas temperatura of about 150ºC and particle mass concentration in the range of 1-5 g/m3

 

Patent:

European Patent EP0640374A1 (PCT/ES1994/000026), “Multifrequency acoustic chamber for the agglomeration and separation of suspended particles in gas effluents”, J.A. Gallego Juárez, E. Riera F. De Sarabia, G. Rodriguez Corral

 

Main related publications:

· J. A. Gallego-Juárez, E. Riera-Franco de Sarabia, G.Rodríguez-Corral, T. L. Hoffmann , J. C. Gálvez-Moraleda, J.J. Rodríguez-Maroto, F.J. Gómez-Moreno, A.Bahillo Ruiz, M. Martín-Espigares, M. Acha. "Application of Acoustic Agglomeration to Reduce Fine Particle Emissions From Coal Combustion Plants" Environmental Science and Technology, Nov.1999 33 (21), 3843-3849.

· J. A. Gallego-Juárez, G. Rodriguez Corral, E. Riera, C. Campos Pozuelo, F. Vazquez, V. M. Acosta “ A macrosonic system for industrial processing”, Ultrasonics Vo. 38, 2000, pp. 331-336.