Spray Scrubber

DUCON® Spray Tower Wet Scrubber

The DUCON® Spray Scrubber is a wet gas-cleaning solution designed for quenching/conditioning and efficient capture of coarse particulates (≥ 9–13 μm). It delivers low specific liquid consumption—typically 0.5–8 L per m³ of cleaned gas—and is effective for removing odors, sulfur dioxide (SO₂), phenol, formaldehyde, and other contaminants.

Design Overview

The scrubber consists of a cylindrical tower equipped with spray nozzles/banks for liquid distribution and duct connections for gas inlet and outlet.

• Spray banks: One or more stages mounted in the upper section generate droplets of 0.07–1.0 mm.

• Contacting regime: Gas flows counter-current to the liquid at typical tower velocities of ~0.6–1.5 m/s. (Higher velocities increase moisture carry-over and may cause dust deposition in outlet ducts.)

• Chemical enhancement: Depending on the pollutant, alkaline/acidic or oxidizing reagents are dosed to boost absorption and reaction kinetics.

• Materials of construction: 304/316 stainless steel (SS), PP, HDPE, or FRP are selected per process conditions.

Main Components

• Cylindrical tower shell

• Gas inlet and outlet connections

• Upper/lower spray banks with nozzles

• Recirculation pump and piping

• Process instrumentation: pH, ORP, conductivity, level, flow

• Control valves and bypass arrangements

• Mist eliminator (demister)

• MCC and PLC control panel

Operating Principle

1. Contaminated gas enters the tower and rises counter-current to finely atomized liquid from the spray banks.

2. Pollutants transfer to the liquid via absorption and chemical reaction; coarse particles are captured.

3. Cleaned gas passes through the mist eliminator and exits the system.

4. The recirculation loop operates continuously; pH/ORP control maintains reagent dosing and liquid quality.

Models & Flow Configurations

• Counter-current, co-current, or cross-flow arrangements

• Single- or multi-stage spray banks

• Optional quench (pre-cooling) stage

Applications

Power and steam generation, chemicals/petrochemicals, steel production, solid/liquid-fired boilers, waste-to-energy/incineration, gas quenching/conditioning, and odor/VOC control.