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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 the most dangerous because of their ability to penetrate in lung tissue, are difficult to remove by conventional separation technology.Sonic energy offers a means to solve the problem. The application of a high intensity acoustic field to an aerosol induces an agglomeration process which changes the size distribution in favor of larger particles, which are then more easily precipitated by a conventional separator. In this work, we present a semi-industrial pilot plant in which this process is applied for reduction of particle emissions in coal combustion fumes. This installation basically consists of a rectangular-section acoustic agglomeration chamber driven by four high power and high directional acoustic

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