In the Spray Dry Absorber (SDA) semi‑wet process, a lime slurry (milk of lime) is atomized into the hot flue gas. As droplets evaporate, fine dry Ca(OH)2 particles form and react efficiently with HF, HCl, SO2, and SO3. The resulting solids are captured downstream in the particulate filter. This approach delivers high removal efficiency, with significantly lower water consumption than wet scrubbers.
Key benefits
- High acid-gas removal efficiency
- Lower water consumption compared to wet scrubbers
- Dry residues with no wastewater treatment required
- Can be combined with Dry Sorbent Injection (DSI) / Furnace Sorbent Injection (FSI) for improved peak control and micro‑pollutant management
Best-fit applications
Coal‑fired plants, municipal and special waste incineration, and steel sinter plants.
Our Sorbacal® solutions
Sorbacal® Q (quicklime) and Sorbacal® H (hydrated lime) can be used to prepare milk of lime on site, while Sorbacal® SL provides a ready‑to‑use slurry. These products ensure the availability of fine, highly reactive Ca(OH)2 for optimal SDA performance.
