| 摘要 |
The present invention concerns a method for dimensioning a particulate filterintended for an exhaust system for a combustion engine. The particulate filtercontains a porous body of silicon dioxide fibers. The method comprises the steps of determining the maximum exhaust flow of the exhaust system and then selecting the surface area of the porous body so that the following conditions are met: FV = Qmax/A≤ 1 m/s; where - FV = flow per surface area - Qmax= maximum exhaust flow in the exhaust system (m3/s); and - A = the surface area of the porous body (m2), through which the exhaust flow passes The method further comprises the step of selecting the amount of silicon dioxide fibers so that the fiber mass/maximum exhaust flow ration in the porous body is: mf/Qmax≥ 1,500 g/1 m3/s; where mf = fiber mass Finally, the porosity of the porous body is adjusted so that it is less than or equal to 99.3%. Using the method according to the invention, it is possible to dimension a silicon dioxide fiber filter so that a filtering efficiency of at least 99% is achieved. |
