Mist Eliminator & Knock-down Vessel for MVR Evaporators

The process

Mechanical vapour recompression raises the pressure of the vapour leaving an evaporator so it can heat the calandria, replacing live steam. The blower handles saturated, often corrosive vapour at a precise pressure ratio, in stainless steel, with a knock-out vessel ahead of it.

The gas at the fan

Saturated vapour, often with dissolved solids and a low pH. Wetted parts in stainless steel, a shaft seal rated for the vapour, drain points and a casing designed for condensate.

Selection for this duty

Construction	Stainless steel or lined vessel with mesh pad or vane pack sized for the droplet load
Density at the fan	At about 90°C the gas density is close to 0.97 kg/m³, 81% of standard air. Pressure developed and power drawn fall in the same ratio, so the selection is made at this density and the motor is checked at cold start.

Separates entrained liquid droplets from a vapour or gas stream, ahead of a compressor, a fan or a stack. Client-stated blade types for the Mist Eliminator in general: Demister Knockdown Vessel.

Industries

Other fans in mvr evaporators

Mist Eliminator in other processes

Information needed to select or quote

1. Gas volume and temperature. Actual flow at the inlet, normal and upset temperature, moisture.
2. Dust or pollutant. Inlet loading, particle size distribution, whether it is abrasive, sticky, hygroscopic or combustible; for gases, the species and concentration.
3. Required outlet. The emission limit or clean gas concentration the unit must meet.
4. Site. Available space and height, material of construction preferences, and how the collected material is to be discharged.