Due to their narrow pore size distribution metal wire meshes guarantee an excellent separation and classifying accuracy. Depending on the combination of the warp wires and the weft wires during the weaving process, the production of different types of weave with different aperture sizes and filtration behaviours is possible. Especially Single Plain Weaves and Dutch Twilled Weaves show a steep increase of the pressure loss as function of the loading and consequently a small dirt holding capacity.
In contrast, a metal fibre fleece is a highly porous depth filter medium with a high dirt holding capacity. Due to the large number of deposition positions in the interior of the nonwoven material, the pressure loss increases during the loading of the filter medium only moderately until the pores are filled completely by dust. A disadvantage of this type of filter medium is its wide pore size distribution. Consequently, no absolute purity of the filtrate can be guaranteed.
The newly developed filter medium “Compomesh” combines the advantages of these two types of filter media. The metal fibre fleece, arranged in the first layer, ensures a high dirt holding capacity and prevents the blocking of the woven wire mesh, which is arranged in the second layer. Due to its narrow pore size distribution the metal wire cloth acts as so-called control filter and guarantees a minimum purity of the filtrate in each loading state of the filter medium. With the new filter medium Compomesh, it is possible to convert the filtration process into the cake filtration at a lower pressure loss. Thus, a reduced power consumption compared to the single-layered wire cloth is needed. Due to the lower increase of the pressure loss as function of the loading, the lifetime of the filter is significantly increased. At the same time, the initial grade efficiency of the Compomesh is higher compared to the single layered wire cloth or fibre fleece. Supporting layers, which can be arranged in the third or further following layers, enable the use of the filter medium under high mechanical stress. By sintering the individual filter layers together, the discharge of nonwoven fibres to the clean gas side is prevented...
Session: G7 - Filter Loading
Day: 14 March 2018
Time: 10:45 - 12:00 h