| 摘要 |
<p>592202 A gassing apparatus 10 including a composite gas flow screen 36 having a center axis and having a plurality of respective gas flowing screen elements 29, 31, 35 each with at least one respective unscreened centrally disposed flow aperture 37,39, 41. The cross-sectional areas of the respective unscreened centrally disposed flow apertures 37, 39, 41 in the respective elements 29, 31, 35 decreases in a downstream direction with respect to gas flow. At least one other gas flowing screen element 33 has no unscreened centrally disposed flow aperture. The element 33 is interposed between two screen elements of the plurality of screen elements.</p> |
