Quench towers create mist through spray atomization, rapid cooling, condensation, and turbulent gas-liquid interaction. Their mist eliminators must handle high liquid load, possible solids, temperature transients, uneven gas distribution, and strong drainage requirements.

Hygroscopic and deliquescent salts can absorb water from humid gas, turning dry deposits into sticky or liquid brine layers that increase pressure drop, reduce drainage, and trap additional solids. Seasonal humidity and temperature changes can therefore alter demister fouling behavior.

Oscillating mist eliminator DP often indicates dynamic liquid inventory, foaming, intermittent slugs, drainage cycling, or changing gas/liquid load rather than steady permanent fouling. Correlating DP with process signals can reveal the mechanism.

Dry DP testing can identify major geometry or fabrication problems but cannot verify wet liquid-handling capacity, flooding behavior, drainage, or re-entrainment. A clean wet operating baseline after commissioning is therefore essential.

Directional vane mist eliminators can underperform if installed backward because blade turns, hooks, and drainage pockets are designed for a specific gas-flow path. Flow arrows, module labels, installation drawings, and pre-startup inspection are essential.