Coalescence filtering candles purifiers

Coalescence filtering candles purifiers

The IMAS AEROMECCANICA series of coalescence candle purifiers is suitable for all applications where it is necessary to filter oil mists or smoke, even with dust and silicates

The product range includes filter and purifiers working in negative pressure of different capacity, suitable to be installed indoors or outside and able to treat deliveries up to 65.000 m3/h.

All the models are fitted with a collecting chamber to recover and eventually reuse the filtered oil and can be equipped with a differential pressure switch to control the filtering candles clogging and with a counter current air jet-pulse for the cleaning, etc…

According to the model and material to be handle, the units can present several filtering stages, and different kind of candles, such as metallic candles or fiberglass candles.

Inside the coalescence fiberglass candles the separation of the air pollutants is due to a series of mechanical mechanisms inside that they are distinguishable as follow:

  1. Inertial impact between the micrometric particles and the candle fibers: considering particles having dimensions about micron or larger, the motion is deflected respect to the direction of the gasses, causing the direct impact between the particles and the candle fibers.
  2. Brownian diffusion for sub micrometric particles: smaller particles, usually having lower mass and smaller size often less than a micron, tend to dodge the fibers following the direction of the gas stream around the objects. Nevertheless, the movement of these particles is affected by a physical phenomena known as Brownian motion. The final result is that the particles are captured thanks to the diffusion in direction of the fiber surface.
  3. Direct interception: For a given particle size, there are certain streamlines which will move close enough to a filter fiber so that the particle will be captured. Streamlines further than one particle radius and that they are away from a filter fiber will not contribute to the interception mechanism. Consider, as a representative example, one small spherical particle of diameter 1 micron moving within a flow line that passes about 0,5 microns or closer to the fiber surface, this particle will be captured thanks to the direct interception mechanism.

Progressively the oil comes into contact with the candle filtering surface, and here tends to aggregate thanks to the coalescence phenomena. The formed bigger drops precipitate by gravity in the lower part of the filter to the collecting chamber


Mechanical processing such as metallic chips, milling, torning, spark erosion, moulding, shearing and cut.

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