| 摘要 |
<p>Particulate material is transported from a low pressure zone to an elevated pressure zone by - passing the material from the low pressure zone to the top of the first one of a number of vertical oblong vessels (2,6,10,14); - passing the material in each vessel (2,6,10,14) by gravity as a moving bed from the top of the vessel (2,6,10,14) to the bottom thereof; - passing the material from the bottom of each vessel (2,6,10,14) but the last one to the top of the subsequent vessel (6,10,14) by mechanical or pneumatic means (5,9,13); - discharging the powder from the bottom of the last vessel (14) to the elevated pressure zone (15). The gas pressure is built up stage wise at the bottom of each vessel (2,6,10,14) a gas pressure higher than the one prevailing at the top is applied, while the gas pressure at the top of each vessel (4,6,10,14) is kept substantially equal to the one prevailing at the bottom of the preceding vessel (2,6,10).</p> |
