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CO₂ Removal Using Lime – Dry Filters and Wet Scrubbers
CO₂ removal using lime typically involves the use of dry filter units or wet scrubbers containing lime milk (a suspension of Ca(OH)₂ in water). In both methods, ambient air is passed through a reactive bed filled with calcium hydroxide, Ca(OH)₂, where CO₂ is chemically bound as calcium carbonate (CaCO₃).
Alternatively, upstream air filters can be installed in pipelines or storage tanks to pre-clean the incoming air. These systems are commonly used in indoor air purification, industrial ventilation, or carbon capture prototypes.
Typical System Components:
- Air inlet for ambient air containing CO₂
- Lime filter housing, filled with Ca(OH)₂ granulate or lime milk
- Dust separator or CaCO₃ discharge unit
- Air outlet providing CO₂-reduced air
Dimensioning Considerations:
The system size and configuration depend on:
- The airflow rate (volume flow),
- The CO₂ concentration in ambient air (typically ~400 ppm),
- The desired operating duration before media replacement or regeneration.
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