2. What is Flue Gas Conditioning?
- Flue gas conditioning is the controlled injection of small quantities of sulfur trioxide into the flue gas stream, reducing the resistivity of the fly ash and permitting its collection in the existing precipitator. When flue gas conditioning is installed on units that have switched to low sulfur coal, sulfur oxide emissions are significantly reduced, complying with environmental regulations and utility standards.
SO3 and moisture combine to form sulfuric acid, which is deposited on the fly ash surface, forming a conductive film and lowering the electrical resistance of the ash.