| 摘要 |
Apparatus for densifying particulate solids and for removing air from the solids includes a screw feeder that conveys the material through a recirculation chamber, then into a high pressure shroud that is closed at its downstream end by a preloaded cover in yieldable sealing engagement with the downstream end of the high pressure shroud. In a preferred embodiment, the high pressure shroud includes a perforated section that extends upstream into the recirculation chamber so that as the particulate material is compressed by the screw in the high pressure shroud, air and some of the particles are expressed through the perforations and are contained by the recirculation chamber which directs the expressed particles downward into the screw which once again pushes them into the high pressure shroud. When the pressure in the high pressure shroud exceeds the preloading pressure applied to the cover at the downstream end of the high pressure shroud, the particulate material emerges from the shroud in a compacted and deaerated condition. The apparatus may also be used to replace a first entrained gas a second entrained gas, while at the same time providing a desired degree of densification.
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