A review of industrial flue gas cleaning (2)

Filtration relies on a number of separation mechanisms to remove particulate solids from gas streams. Filters are very efficient collectors and can operate at low pressure drops, typically 75 mm Wg to 150 Wg. Their performance is independent of the chemical/physical nature of the process particulate. They offer very high collection efficiencies for fly ashes, typically up to 99+% giving emissions from moving grate type incinerators of typically 1 to 10 mg/Nm3 depending on the specification. They also allow the addition of dry scrubbing control technologies without particulate emission penalty. Different types of filters are reviewed. These are: fabric filters, ceramic filters, and metallic filters.