| 摘要 |
A continuous separation apparatus and method which continuously purges, washes, dries and removes solids from a slurry 10. A separator 15 comprises a casing 22, a horizontal rotary screen within the casing, a fixed scraper mounted in the casing above the screen, an inlet conduit 25 on one side of the scraper for depositing slurry on the screen to form a layer as the screen rotates, an outlet conduit 40 on the other side of the scraper and gas nozzles for directing a gas stream at the solids as they encounter the scraper, entraining them and directing them through the outlet conduit 40. The screen divides the interior of casing 22 into respective upper and lower chambers 23 and 24 that are sealed from one another except through the screen. In operation, the gas stream carries the entrained solids to a separate receiver 17. The gas is then recirculated at 45 and enters the upper chamber 23 of the separator at a slightly positive pressure. The lower chamber 24 is evacuated by evacuation means 20 so that a portion of the gas in the upper chamber passes through the slurry layer to displace liquid through the screen while further amounts of the gas cause additional drying of the solids so that they are of a suitably low liquid content when they encounter the fixed scraper and are entrained out of the separator. The recovered liquid is automatically degassified as it falls through the lower chamber 24 prior to its removal at 30. <IMAGE> |
