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Prof. Heinz Fissan
Ͻ 2014 9 3 ()   10:00 ~ 11:00
Testing of Multifunctional Filter Systems
÷ ƼϿ_H.Fissan.pptx (151.11KB)  
 

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1.  : Testing of Multifunctional Filter Systems
2.  : Prof. Heinz Fissan
3.  : 2014 9 3 () 10:00 ~ 11:00
4.  : б Űа(301) 1420ȣ ǽ
5.  :

     More and more multi-functional filtration devices are developed, investigated and used. In this presentation mainly cabin air filters as an example will be discussed. Their multi-task includes low pressure drop, dust and Diesel soot collection, odor and toxic gas reduction. They consist mainly out of activated carbon supported by nonwoven fibrous media. The particle filtering as well as the molecule adsorption processes and their coupling have to be considered to describe and improve the performance and to compare their quality.

     Dust particles mainly affect the long term collection efficiency and the pressure drop, because they change the geometry and therefore the porosity of the filter medium. They also may affect the gas adsorption process due to coverage of surface area of the activated carbon or their own adsorption capabilities depending on the chemical composition. For cabin air filter Diesel soot occurring in atmospheric aerosols is of special interest. Diesel soot itself is health relevant (PAHs), it is carrier of odor relevant components and may affect adsorption processes of other toxic gases. Diesel soot occurs in the form of loose agglomerates. Its collection efficiency curve changes with morphology, but fortunately the measurement of the collection efficiency with SMPS is not morphology dependent. For testing the filter can be challenged by polydisperse soot and the data evaluation procedure can be done assuming spheres. This is also true for the collection efficiency as function of mobility diameter based on calculated surface area concentration, a maybe more relevant health parameter. If for control purposes the emitted surface area concentration is of interest, the morphology plays a role. It will be shown that the morphology effect may be neglected for number and surface area concentrations even for the highly structured Diesel soot, but not for volume concentrations. Based on this assumption the much simpler measurement technique Electrical Sensor is introduced for measurement of number and surface area concentrations.

      A very sensitive method for low molecular concentrations of toxic gases especially occurring behind a filter based on x-ray radiation has been evaluated. The reduction of odors and certain molecular components have also been studied. As an example the adsorption of NOx can be enhanced with activated carbon functionalized with MeOx nanoparticles for catalytic reduction of NO2.

6.   :

      Prof. Heinz Fissan is a Retired Professor for Process- and Aerosol Measurement Technology in the Faculty of Engineering Sciences, Institute for Nano-Structures and Technology (NST) at the University Duisburg-Essen, and Scientific Director at the Institute of Energy and Environmental Technology e.V. (IUTA), Duisburg, Germany.

 

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