Packed Tower Wet Scrubber | 99% Gas + 95% Dust Removal

A spray tower uses only nozzles to create liquid droplets, while a packed tower uses a bed of packing material to increase gas-liquid contact area. This makes packed towers 30-40% more efficient at removing both gases and dust, especially for fine particulates.

Spray towers are simpler and less prone to clogging but have lower efficiency. Packed towers are preferred for applications requiring high removal efficiency and simultaneous gas and dust treatment. Learn more in our packed tower vs spray tower comparison guide.

Dust particles are removed through three mechanisms: impaction (particles collide with packing surfaces), interception (particles follow gas streamlines and touch packing), and diffusion (fine particles diffuse into liquid film).

The high surface area of the packing provides numerous collision points, making packed towers highly effective at removing particles ≥0.5 μm. For smaller particles, we recommend adding a venturi pre-scrubber stage.

We recommend multi-faceted hollow ball packing for most applications due to its high surface area, low pressure drop, and excellent anti-clogging properties. For high-dust applications, we may recommend Pall rings or Raschig rings.

Our engineers will select the optimal packing type and size based on your specific exhaust characteristics and performance requirements.

We prevent packing clogging through three design features: large-orifice anti-clog nozzles, open-structure packing with high void fraction, and an automatic backwashing system that flushes the packing bed with high-pressure water on a scheduled basis.

For extremely high-dust applications, we also recommend adding a pre-filter stage to remove large particles before they enter the packed tower.

With proper maintenance and regular backwashing, PP packing can last 5-8 years. The packing should be inspected annually for signs of wear, damage, or excessive fouling.

Our packed tower anti-clogging maintenance checklist provides detailed instructions for packing inspection and replacement.

Packed tower sizing depends on four main factors: total exhaust air volume, types and concentrations of pollutants, dust particle size distribution, and required outlet emission limits.

Our engineers can provide a detailed sizing calculation based on your specific operating conditions. You can also refer to our packed tower sizing calculation guide for more information.

The optimal gas-liquid ratio (L/G) for a packed tower scrubber is typically 1.5-3.0 L/m³, depending on the pollutant concentration and solubility. Higher concentrations require higher L/G ratios to ensure complete absorption.

Our automatic control system adjusts the liquid flow rate based on inlet pollutant concentration, optimizing the L/G ratio for maximum efficiency and minimum water consumption.

The wastewater from a packed tower contains dissolved salts and suspended dust particles. It is typically treated by sedimentation to remove solids, followed by neutralization to adjust pH before discharge.

For high-volume applications, the clarified water can be recycled back to the scrubber, reducing water consumption by up to 80%. Our engineers will help you develop a wastewater management plan that meets local regulations.

Yes, our modular design allows for easy addition of treatment stages. For facilities requiring higher removal efficiency, we can add a second packed bed stage or an activated carbon polishing stage for final treatment.

For facilities with both SO₂ and NOₓ emissions, we can also integrate an oxidation stage to convert NO to NO₂ for improved removal efficiency.

Choose a packed tower if your exhaust contains both gaseous pollutants and dust particles. Dry dust collectors (baghouses, cyclones) can only remove dust and cannot treat gases.

Packed towers also offer the additional benefits of gas cooling, humidity control, and lower fire and explosion risks compared to dry collectors. For pure dust streams with no gaseous pollutants, a dry collector may be more cost-effective.