How Does fiber bed mist eliminators Work?

Fiber bed mist eliminators consist of thick layers of very fine fibers placed between two concentric cylindrical screens or cages. Chemically resistant glass fibers, synthetic fibers and other special types of fibers are used as the fiber bed material, depending on the process environment. Structural screen/cage parts and flanges are made of any weldable metal, plastic or glass reinforced resins.

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All fiber bed mist eliminators operate in a similar manner. Gases containing mist particles are directed horizontally through the fiber bed, and the mist particles collect on the individual fibers within the fiber bed and coalesce to form liquid films. These liquid films are then moved through the fiber bed by the gas flow, and the liquid drains off the downstream face of the fiber bed by gravity. Fiber bed mist eliminators are typically installed in a vessel or tank and the collected liquid is continuously drained from within the tank.

A fiber bed design innovation is the addition of a second coarser fiber layer on the downstream side. This additional layer expedites drainage and prevents re-entrainment of the liquid back into the gas stream.

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.

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.

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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).

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