Air/Gas Filtration

With the rise of airborne molecular contaminants and the increased demands for clean air, filtration of these contaminants has become a critical element in larger filtration systems. Gas phase filtration is only one component within these types of filtration systems, and it is often combined with other air filtration technologies. With gas phase filtration, gases are filtered via the adsorption of molecules on to materials through forces known as physisorption and chemisorption. When gas phase filtration is integrated with particulate filtration in a combined solution, the most optimal performance can be achieved. Gas phase filtration is one of the most demanding applications in filtration where performance delivers value for material providers and filter manufacturers alike. 

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This paper introduces a novel long-life air cleaning unit with low maintenance requirements for use in heavy dust environments. This unit adopted a new design with auto-rolling structure and auto self-cleaning to greatly lower the requirements for maintenance and medium change. The prototype machine equipped with G4 media was installed and operated continuously in a subway station in Beijing since December, 2016. The monitoring test results of the prototype unit performance was recorded and analyzed. The results of these tests will be presented.

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There has been increasing interest in specifying the efficiency of ventilation filters at PM 2.5 and 10. PM is a measure of outdoor air quality determined according to strictly specified statutory procedures, or their approved equivalents. In this paper, results of one approach to measuring filter efficiencies at close to PM will be presented. The results will be compared with efficiencies measured according to prevailing filter test standards, in which particle counters are the approved means for measuring particle concentrations. An accounting of the differences between the particle measurements and PM will be suggested as the basis for a better estimate of PM efficiencies than the simple schemes used in some prevailing standards.

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Since about 2006, air filtration has been a very effective way of protecting confined livestock against airborne virus. Today in America a very high percentage of the pork production facilities are under complete air filtration. Swine growers are being able to keep most airborne viruses out of their barns thanks to air filtration and a sound biosecurity protocol in place.

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Need of specialty hot gas filtration media has been attracting more attention in a wide variety of application over the last years. Main reasons for that are higher demands on emission levels, more control on SOx and NOx levels. Filter media performance can be enhanced by using specialty blends to meet the stringent emission norms and acid and alkali resistance requirement in Asphalt and Ferrous alloy application. Demand for higher air permeability i.e. lower pressure drop and Lower Mean Pore size

i.e. higher efficiency is increasing in hot air filter media for reduction of the overall process costs and meeting the emission level norms.

This paper provides a detailed study on an innovative filter media for hot gas filtration. Fundamental aspects of filtration at higher temperatures with hydrolysis resistance are described first, including the influence of the temperature, acid and alkali on filtration media. The main focus is on the review of hot gas filter media for asphalt and Ferrous Alloy Application. This innovative filter media is comprised of special blended synthetic fibers, singed and calendared delivers superior performance due to excellent acid, alkali and hydrolysis resistance over other filtration media. The media is suitable for mid temperature range applications like F&B boilers and ferrous alloys with thermal shrinkage less than 1% at 180 degrees for 1 Hr. This new media delivers high permeability and lower mean pore size due to hybrid technology results in better efficiency and less energy consumption. This paper also covers the comparative study of physical, chemical and performance properties of the new media and 100% PET and 100% M-Aramid material as per VDI 3926.

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