Fabric filter (FF)

The fabric filter (or baghouses or bag filters) uses a filter medium to separate particulate matter (PM) from the flue gases. The PM is deposited on the surface of the fabric filter, which can be made of different materials depending on the physical and chemical composition of the flue gas. The dust is removed periodically when the bags are cleaned.

ANDRITZ fabric filters have been developed over the past decade to reduce particulate emissions, capital cost and footprint. These filters offer a robust solution for power generation and industrial applications, especially when the dust characteristics are challenging or variable. ANDRITZ offers both high-ratio (pulse jet) and low-ratio (reverse air) FF designs. The ANDRITZ fabric filter may be used as a stand-alone unit or integrated into hybrid filters (ESP and FF) or multi-pollutant control equipment (TurboSorp, Turbo-CDS, NID or SDA). In addition, ANDRITZ is actively collaborating with filter bag manufacturers to offer guarantees for the lowest emissions and longest bag lifetime on the market for selected processes.

The key features of the ANDRITZ fabric filter are:

Outlet PM emissions lower than 2 mg/Nm³
Removal efficiencies greater than 99.9% for dPM > 5 µm and up to 99.6% for dPM < 5 µm
Greater fuel flexibility and ability to handle varying plant operating loads
Can be adapted to small or large volumetric flows of flue gas
Industrial and electricity generation applications, with over 1,400 references worldwide
Filter bags up to 12 meters high for reduced footprint and operating costs
Flue gas inlet temperatures up to 260 °C (~500 °F) with polyester bags
Renowned OPTIPOW plunger valves for efficient bag cleaning
Latest state-of-theart controller EFFIC with advanced functions, such as modulated pulse cleaning for longer bag life and lower particulate emission
Well suited for stand-alone operation or integration into multi-pollutant equipment
Collaboration with filter bag manufacturers to offer guarantees for the lowest emissions and longest bag lifetime on the market

Rendering of ANDRITZ Fabric Filters

ESP Electrostatic Precipitator 3D white-computer generated image

Dry Electrostatic Precipitator (ESP)

The ESP uses electrical forces to remove Particulate Matter (PM) from the flue gases. A high voltage source, generating a corona current, charges the PM which migrate to the collecting plate. PM are removed from the plate by a knocking action.

Hybrid Filters

Hybrid Filter is a combination of ESP and FF with several configurations (in serie and in the same casing (integrated) or in separated casings in serie or in parallel (separated)).

EKP Unit 2 - ANDRITZ Wet Electrostatic precipitator (WEST)

Wet Electrostatic Precipitator (WESP)

As for the dry ESP, the wet ESP uses electrical forces to remove Particulate Matter (PM) from the flue gases. A high voltage source, generating a corona current, charges the PM which migrate to the collecting plate. PM are removed from the plate by flushing water.

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