How to Select a Mist Eliminator for Scrubber Towers: Engineering Selection Guide

How to Select a Mist Eliminator for Scrubber Towers: Engineering Selection Guide

Introduction

Scrubber towers are widely used for removing harmful gases, chemical vapors and pollutants from industrial exhaust streams.

A mist eliminator installed at the outlet of a scrubber plays an important role in removing entrained liquid droplets and preventing liquid carryover.

Selecting the correct mist eliminator requires considering droplet size, gas velocity, corrosion conditions, fouling tendency and removal efficiency requirements.

DAIER Separation provides wire mesh mist eliminators, vane mist eliminators and customized gas-liquid separation solutions for scrubber systems.

Why Does a Scrubber Need a Mist Eliminator?

During scrubber operation:

• Gas contacts circulating liquid inside the tower

• Liquid droplets are carried upward with gas flow

• Mist eliminator removes these droplets before gas leaves the tower

Without proper mist removal, problems may occur:

• Liquid carryover

• Downstream equipment contamination

• Corrosion problems

• Reduced emission performance

Common Types of Mist Eliminators for Scrubbers

1. Wire Mesh Mist Eliminator

Wire mesh mist eliminators use knitted mesh layers to capture liquid droplets.

Advantages

• High removal efficiency

• Good performance for fine droplets

• Compact structure

• Low installation space requirement

Suitable Applications

• Chemical scrubbers

• Acid absorption towers

• Clean gas streams

2. Vane Mist Eliminator

Vane mist eliminators use blade-type structures to separate droplets through changes in gas flow direction.

Advantages

• Excellent fouling resistance

• High gas handling capacity

• Suitable for contaminated gas streams

Suitable Applications

• Flue gas scrubbers

• Large industrial scrubbers

• High liquid loading systems

Key Factors for Mist Eliminator Selection

1. Droplet Size

Droplet size determines separation performance.

Fine droplets usually require:

• Wire mesh mist eliminator

• Higher density mesh structure

Larger droplets may be removed effectively by:

• Vane separators

2. Gas Velocity

Gas velocity affects:

• Separation efficiency

• Pressure drop

• Re-entrainment risk

If gas velocity is too high:

• Captured liquid may be carried away again

• Outlet mist concentration may increase

3. Corrosion Environment

Scrubber systems often contain corrosive components.

Material selection should consider:

• Chemical concentration

• Temperature

• Operating environment

Common materials:

• SS316L

• PP

• PTFE

• Special alloys

4. Fouling Risk

For gas streams containing:

• Dust

• Solids

• Crystals

• Reaction products

vane mist eliminators are often preferred because of their open structure.

Wire Mesh vs Vane for Scrubber Applications

Common Scrubber Mist Eliminator Applications

Acid Gas Scrubbers

Used for:

• HCl removal

• SO₂ absorption

• Chlorine treatment

Recommended materials:

• PP

• PTFE

• Stainless steel

Waste Gas Treatment

Used for:

• Chemical exhaust

• Industrial emissions

• VOC treatment

Flue Gas Systems

Important requirements:

• High gas capacity

• Low pressure drop

• Fouling resistance

Information Required for Mist Eliminator Selection

Engineers should provide:

• Gas flow rate

• Gas composition

• Droplet size requirement

• Operating temperature

• Operating pressure

• Liquid loading

• Corrosion conditions

• Installation orientation

• Available space

Common Mistakes

Selecting Mist Eliminator Only by Efficiency

A very high-efficiency design may not work well in dirty gas conditions.

Ignoring Installation Method

Important details:

• Horizontal or vertical installation

• Support structure

• Segment size

• Manway access

Choosing Material Without Checking Corrosion

Incorrect material selection may reduce service life.

Conclusion

Selecting the right mist eliminator for scrubber towers requires balancing efficiency, pressure drop, fouling resistance and material compatibility.

Wire mesh and vane mist eliminators each have advantages depending on the operating environment.

DAIER Separation provides customized mist eliminator solutions for scrubbers, absorption towers and industrial gas-liquid separation systems.

Related Products

• Wire Mesh Mist Eliminator

• Vane Mist Eliminator

• Plastic Mist Eliminator

• Tower Internals

• Scrubber Packing