4 Advice to Choose a fiber bed mist eliminators

From the very first development and invention of Brink® fiber bed mist eliminators by Dr. Joe Brink in to today, MECS, Inc., a wholly owned subsidiary of Elessent Clean Technologies, has offered the widest variety of technology-based mist elimination products in the world for the effective removal of sub-micron mist particles from gas streams. Using extensive experience in industrial gas inlet conditions, fiber bed design, materials of construction and corrosion resistance, we can optimize the mist eliminator design to suit individual plant requirements and achieve the highest efficiencies in emission control, lowest pressure drop and longest effective life while balancing cost and benefits in today’s cautious economic conditions.

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MECS® engineers work closely with our customers to determine the Brink® mist eliminator product that best meets their needs. The Brink® design solution will ensure a mist eliminator product that provides high performance in removing submicron-mist particles that cause visible emissions, while reducing maintenance costs, and many times increasing plant profitability with production enhancements via process de-bottlenecking.

FLEXIFIBER® mist eliminators from Koch-Glitsch provide the highest removal efficiency of sub-micron mists and can help reduce visible stack gas plumes.

Constructed of special media contained between two concentric or flat parallel screens, FLEXIFIBER® mist eliminators reduce visible stack gas plumes. For the Koch-Glitsch line of mist elimination products, the FLEXIFIBER® mist eliminator provides the highest removal efficiency of sub-micron mists.

Koch-Glitsch offers multiple types of FLEXIFIBER® mist eliminators which use the following separation mechanisms:

• Brownian Diffusion (Type BD) 
• Impaction Cylinder (Type IC) 
• Impaction Panel (Type IP) 

Each FLEXIFIBER® mist eliminator solution from Koch-Glitsch is engineered and fabricated to the application and specifications: 

• Cages available in multiple metals, plastics, and FRP 
• Packing media produced in glass, plastics, and carbon  
• Skid-mounted units are also available 

FLEXIFIBER® type BD mist eliminators from Koch-Glitsch use Brownian Diffusion to achieve high collection efficiencies for submicron liquid particles.

High collection efficiency on submicron liquid particles; low to moderate pressure drop 

The FLEXIFIBER® type BD element uses the Brownian Diffusion mechanism to achieve collection efficiencies of up to 99.95% or higher on all submicron liquid particles down to 0.1 microns. Operating pressure drops are normally designed in the range of 50 to 500 mm (2-20 in) W.G.  

An interesting feature of the FLEXIFIBER® type BD mist eliminator is that, with submicron particles, the collection efficiency actually increases as the gas flow rate decreases through the bed. Increasing residence time in the fiberbed optimizes Brownian movement. 

Type BD elements are cylindrical in shape and are available in a wide variety of materials. The type BD element with carbon fiber media is recommended if your application contains flourides, a high PH, or is subjected to steam. This will help increase the life expectancy of the element compared to glass fiber media.  

FLEXIFIBER® type BD-LdP (low pressure drop) has increased submicron particle collection efficiency with reduced pressure drop compared to conventional fiberbed technology. Because fiberbeds can consume large amounts of energy (such as in chlorine and sulfuric acid production trains), increased efficiency and reduced pressure drop provide significant reductions in operating costs. This technology brings benefits to any process in the forms of decreased investment, lower operating costs, and improved plant performance.  

How it works 
Brownian Diffusion occurs with extremely small droplets that randomly move from side to side, not directly following the path of the gas stream. Typically, the smaller the particle, the greater the Brownian movement. 

Product Benefits

• Reduce or eliminate visible stack gas plumes 
• Provide unlimited turndown from design capacity 
• Achieve guaranteed pressure drop as low as 1.5 in [40 mm] W.G. 
• Interchangeable with existing fiberbed equipment 
• High-efficiency capture of submicron mist particles

FLEXIFIBER® type IC mist eliminators from Koch-Glitsch use impaction to economically and efficiently capture liquid particles in the 1 to 3 microns range.

Economically capture liquid particles in the 1 to 3 microns range 

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Primarily utilizing the impaction mechanism, FLEXIFIBER® type IC fiberbeds are designed to economically capture liquid droplets in the 1 to 3 microns range. Collection efficiencies at 1 micron will vary from 90% on liquid mists with a specific gravity of 1.0 to 97% on liquid mists with a specific gravity to 1.8. Operating pressure drops are typically in the range of 100-250 mm (4-10 in) W.G.  

In addition to the standard FLEXIFIBER® type IC elements, Koch-Glitsch also offers FLEXIFIBER® types IC-K, IC-KLF, and IC-M mist eliminators.  

Type IC-K is a low pressure drop, high capacity mist eliminator. It is typically used in applications where frequent washing of the element is necessary, whether it be soluble and insoluble solids. An example of this type of application is sulfate buildup in air drying towers at sulfuric acid plants.  

Type IC-KLF and type ICK combine our knitted wire mesh and fiberbed technologies to produce extended life mist eliminators that are less inclined to foul with solids. This provides energy savings and longer run lengths in critical services, such as sulfuric acid drying towers.  

Type IC-M is an element that uses a primary layer of glass fibers and secondary layer of knitted wire mesh that offers high efficiency and high capacity, i.e. protection against liquid carryover.  

How it works 

Inertial impaction occurs where the mass of the droplet is large enough that it typically cannot follow the path of the gas stream and impacts directly on the target.  

Product Benefits

• High collection efficiency combined with good fouling resistance 

FLEXIFIBER® type IP mist eliminators from Koch-Glitsch use impaction to remove entrainment from vapor and capture liquid particles in the 1 to 3 microns range.

Economically capture liquid particles in the 1 to 3 microns range. 

FLEXIFIBER® type IP mist eliminators primarily use the impaction mechanism to remove entrainment from vapor. Collection efficiencies on 98% sulfuric acid mist are essentially 100% on all particles greater than 3 microns, 85% to 97% on all particles 1 to 3 microns and 50% to 85% on 0.5 to 1.0 microns. Operating pressure drops are normally 125 to 180 mm (5 to 7 in) W.G. 

Elements are normally rectangular in shape and are available in various metals, typically metal frames and glass fiber media.  

Type IP fiberbeds are most commonly used in sulfuric acid plants. 

How it works 

Inertial impaction occurs where the mass of the droplet is large enough that it typically cannot follow the path of the gas stream and impacts directly on the target.  

Product Benefits

• High efficiency 
• Compact design