How Does fiber bed mist eliminators Work?

Particles of 3 microns or larger are collected when their moment (kinetic energy) prevents them from following the gas stream lines around a fiber. The moment of the particle causes it to remain on its path reaching the fiber where it is captured.

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Since momentum is a function of the particle’s mass and velocity, it follows that large drops will be collected more efficiently than small drops traveling at the same speed. This type of mechanism is extremely dependent on the particle inertia and the viscosity of the gas.

Sub-chromic particles are collected when their moment (kinetic energy) prevents them from following the gas stream lines around a fiber. The moment of the particle causes it to remain on its path reaching the fiber where it is captured.

Since momentum is a function of the particle’s mass and velocity, it follows that large drops will be collected more efficiently than small drops traveling at the same speed. This type of mechanism is extremely dependent on the particle inertia and the viscosity of the gas.

Developed to collect 75-99% of particles in the 1 to 3 micron range. Inertial impact is used as the main mechanism and capture and, therefore, it is developed to operate at high speeds in the bed (in the range of 1.0 to 3.0 m / s).

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Impaction cylinders are typically 650 mm (26 ”) in diameter and 500 mm to mm in height (20-72”).

Typically, collection efficiencies of 94 to 99.7 percent on all particles one micron and smaller in diameter are utilized in Brink® mist eliminator systems. Our diffusion bed mist eliminators are designed for a specified pressure drop, usually in the range of two to 20 inches of water column. Since pressure drop is proportional to fiber bed area, the size and cost of a Brink® diffusion fiber bed increases for lower designed pressure drops and higher collection efficiencies. The figure below shows the effect of pressure drop and collection efficiency on the cost of Brink® mist eliminator diffusion fiber beds for a given gas flow.

NOTE:  Collection efficiencies in all Brink® mist eliminator systems are measured on a weight basis by particle size. Brink® systems can be designed to meet varying client needs, with collection efficiencies of 100 percent on all particles larger than one micron in diameter and as high as 99.999+% on all particles less than one micron in diameter.

We select the optimum fiber bed design for your process to minimize total cost. Note that in addition to up-front capital cost, the overall life cycle cost of mist eliminators includes operating pressure drop (energy consumption) and the cost of maintenance. Often it is better to include extra operating margin in the mist eliminators to extend service life rather than trying to find the lowest cost installation.

For minimum overall life cycle cost, it is important when purchasing a fiber bed system to balance collection efficiency, operating pressure drop, and product service life. Brink® mist eliminator application experience in over 300 applications with over installations world-wide will help assure your fiber bed design will provide balanced, state-of-the-art performance for your peace of mind.

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