Study of the behavior of oil removal coalescing industrial filters from Lautrette Industries

Optimization and Design Laboratory in Environmental Engineering ESIGEC, University of Savoie, France


For the two studied filters, the evolution of the pressure drop when placed in the gas flow is different. For the first, it grows slowly until it reaches an oil wetness where it increases exponentially to a plateau corresponding to the start of drainage. For the second, the deposition of droplets on filter fibers has an influence on the pressure drop in the opening minutes.

The constitution of the filter cartridges also influences the evolution of the effectiveness of filters when they are put into the gas flow. The filter with fewer layers sees its effectiveness steadily increase until reaching a maximum at the beginning of drainage. For the second, the efficiency decreases until the drainage, past this point it finally rises slightly to a plateau.

Due to its formation, the second filter has a purification coefficient ten times larger than the first. Finally, it should also be noted different trends of fractional efficiencies depending on droplets class size. Thus, for the less effective the filter, the fractional mass concentration decreases during maturation of the filter except for classes 0.575 and 0.725 microns for which it increases. This phenomenon appears to be due to the bursting of bubbles formed on the entire surface of the filter during the drainage. For the second filter, the efficiency decreases for all the droplets class sizes, the bubbling being observed only in the lower area of ??the filter.

Finally, it was shown that the droplets size distribution in output is not dependent on the oil concentration in the filtered gas, under our experimental conditions, but that it varies with the speed of filtration.

Thus, when the gas flow slows down from 60 m3/h to 20 m3/h, the mean droplet diameter increases.

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