The Ca(OH)2 – either purchased as slaked lime or (more frequently and economically) prepared on site from burned lime, CaO – is pumped to the Rotary Atomizer from a buffer tank. After separation, the powder is either transported to an end-product storage facility, or recycled in the process for improved utilization of excess absorbent. The end product from the process is a stable and dry powder. This powder is used all over the world, mainly in road construction, as building materials, and for other purposes in the construction industry.
The Spray Drying Absorption technology features excellent performance for absorption – not only of primary pollutants such as SO2 and HCl. For, due to finely atomized absorbent sprayed into the flue-gas stream and the subsequent dust removal, pollutants such as SO3, HF, etc. will practically be completely removed. This facilitates the use of carbon steel as construction material throughout the flue-gas path. And there are two further benefits: In the first place, the process allows for the use of low-quality process water, such as e.g. waste water or even seawater; and, secondly, as the process generates no waste water, there will be no subsequent waste-water treatment or processing.
More than 200 references
Worldwide, more than 200 Spray Drying Absorption plants are installed at power stations, steel plants, waste incinerator plants, and at plants burning hazardous waste. They all share one common trait: They are operated in accordance with or above required performance stipulations as laid down by local authorities. Even today, the very first plants, installed in the 1980’s, are still operating satisfactorily and successfully.
• Total plants built: > 200
• Total number of absorbers: > 350
• Total number of atomizers: > 450
• Process installed at close to 25,000 MWe and 4,300 MWt power-plant capacity
• Process installed at more than 160 incineration lines, worldwide
• Process installed at more than 10,000 m2 sinter band, worldwide