AAAR 33rd Annual Conference
October 20 - October 24, 2014
Rosen Shingle Creek
Orlando, Florida, USA
Abstract View
Evaluation of Metallic Filter Media for High Temperature Filtration Application
QISHENG OU, James Warner, Matti Maricq, David Y. H. Pui, University of Minnesota
Abstract Number: 323 Working Group: Control Technology
Abstract Filtration is considered the most economical control technique to effectively remove airborne particles in nanometer size range. Many filtration systems are operated at high temperature, such as in advanced coal power plants, engine exhaust after-treatment, and chemical and petrochemical processes. Besides the conventional fabric bag and ceramic filter media, metallic filter media is seeing more applications because of its high porosity and strength, good thermal resistance, and good optimization between efficiency and back pressure.
In this study, the pressure drop and collection efficiency of metallic filter media were characterized under a variety of flow temperatures with soot particles as challenging aerosols. Two types of metallic filter media were tested: one is a sintered metal type media with similar structure as conventional ceramic filter media used in automobile exhaust after-treatment, and the other is a type of non-woven metal fiber media with higher porosity and specific area, which has similar microstructure as fiberglass fibrous filter media used in low temperature filtration applications. The pressure drop and collection efficiency of both clean and soot-loaded filter media were measured. The effects of media characteristics and flow temperature were investigated under a variety of filtration velocities. The filter media quality factor, which represents the tradeoff between collection efficiency and pressure drop, as well as its implications for high-temperature filtration system design will be reported and discussed.