Dürr Megtec provides a variety wet scrubbers including spray tower, tray tower and packed tower designs for industrial acid gas emissions control.
- Simplicity of construction and operation
- Flexibility of operation (gas volume, acid gas concentration, etc.)
- Low pressure drop
- High removal efficiencies for a variety of acid gases, including SOx (SO2 and SO3), HF, and HCl
- Not susceptible to plugging
- Small footprint
- Low capital equipment and installation cost
The principle of acid gas removal is to expose the acid gas to an alkaline agent and by chemical reaction form a stable salt, which subsequently can easily be removed with the liquid. This is accomplished in a spray chamber, most often a vertical tower, where water containing the reagent provides the necessary contact surface for the chemical reaction to take place.
The most common reagents include:
- Sodium hydroxide (caustic) NaOH
- Sodium carbonate (soda ash) Na2CO3
- Magnesium hydroxide Mg(OH)2
- Calcium hydroxide (hydrated lime) Ca(OH)2