A traditional vertical quench tower is the most common and widely accepted quench design. It is often similar in dimension and footprint to the downstream wet scrubber despite their operational differences. The incoming gas stream usually enters at the top of the tower and exits at the bottom or the side of the unit. Nozzles and spray patterns may operate in a co-current or counter-current mode depending on application specifics.
The vertical quench tower typically uses the recirculated scrubbing liquor and/or fresh water to evaporate moisture and cool the incoming gas. An emergency fresh water feed is usually recommended in the event of primary nozzle plugging or pump failure.
In this photo, the Quench Tower is on the left and the Packed Bed Scrubber is the tower on the right.