| 摘要 |
Method and apparatus for filtering a gaseous medium such as welding gas to remove solid particles therefrom. The gaseous medium is passed through a bed having at least two strata of peat litter, wherein the peat litter particles have been screened in such a manner that the first layer as seen in the direction of gas flow comprises particles having sizes ranging from a certain predetermined value and upwards, and the second layer or stratum has particles the sizes of which lay below the said predetermined value. A coating successively builds up in the first layer of peat litter contributing to the filtering effect, whereas the second peat litter layer during this building up period will perform the major part of the filtration. |
