PureFlow logo. Desulfurization & Denitrification

Roof Mist Eliminator – Low Pressure Loss, High Efficiency

A roof mist eliminator typically consists of two stages of “ridge-shaped” modules along with a flushing system. The first stage performs coarse mist elimination (capturing larger droplets, e.g., 20–30 μm), while the second stage ensures fine mist removal (capturing smaller droplets, e.g., 15–20 μm). The modules are arranged at an angle of 37.5° to the horizontal plane, ensuring uniform gas flow distribution, a large flow area, reduced pressure loss, and mist elimination without dead zones. This design is suitable for high gas velocities and wide fluctuations in flue gas flow, and is commonly used in large-scale units.

Two-stage roof mist eliminator systems stacked together
Features
  • Stable structure. The roof mist eliminator features a triangular design, requiring minimal installation height within the tower and providing a compact and stable structure.
  • Excellent corrosion resistance. Manufactured from premium, standard-compliant materials, ensuring reliable performance under harsh conditions like high-moisture flue gas.
  • High mist elimination efficiency. Mist elimination efficiency can reach 98% and above, with outlet droplet content ≤ 50 mg/Nm3.
  • Low pressure loss. Scientifically designed gas flow path ensures low pressure loss while maintaining high efficiency, thereby reducing fan energy consumption.
  • Easy cleaning and maintenance: The vane profile is similar to a sinusoidal curve, with a smooth surface for easy washing and reduced clogging risk.
Installation Method
Roof mist eliminator ridge type installation
"Ridge"-Type Installation

A classic layout with a simple structure and uniform gas flow distribution, suitable for most conventional flue gas desulfurization applications.

Roof mist eliminator x-type installation diagram
X-Type Installation

The vanes are arranged at more complex angles to the gas flow, enhancing collision and separation efficiency, and allowing better utilization of absorbent liquids.

Roof mist eliminator diamond installation diagram
Diamond Installation

The vanes are arranged at more complex angles to the gas flow, enhancing collision and separation efficiency, and allowing better utilization of absorbent liquids. It requires only a single layer of support beams, reducing the overall height of the mist elimination system.

Principle
  1. The gas-liquid mixture enters the mist eliminator, and the gas passes between the vanes.
  2. Droplets collide with the vane surfaces due to inertia and are captured.
  3. Captured droplets coalesce into larger droplets on the vanes and flow down under gravity or flushing force.
  4. The purified gas continues to flow and is discharged.
Working principle of mist eliminator removing droplets via vanes
Specifications
Table 1: Roof Mist Eliminator Specifications
Material PP, stainless steel, FRP, polysulfone, etc.
Dimensions Customizable
Vane spacing 20 – 50 mm, customizable
Outlet droplet content ≤ 50 mg/Nm3
Ultimate separation particle size 24 μm
Related products