| 摘要 |
PURPOSE:To stabilize the concn. of concentrated cake obtd. by centrifuging by controlling the position of the skimmer nozzle and the number of revolutions of the screw so as to obtain an optimum balanced value for discharging head of the filtrate and discharging head for cake. CONSTITUTION:A signal corresponding to supplied solid matters in the slurry is obtd. from each detection signal of slurry flow rate detector 27 and slurry concn. detector 28. Each concentration signal of slurry and filtrate from detectors 28, 29 and cake concn. signal from a settor 36 are operated using a formula to obtain a signal corresponding to the rate of recovery of solid matters. From these operation signals, a signal corresponding to cake discharge amt. and similarly a filtrate discharge amt. signal are obtd. From above-described signals, a filtrate discharging head signal is operated by further operation, which is inputted into a controller 34 to change the position of the skimmer nozzle 21, and the number of revolutions of the screw is controlled by a controller 38 basing on the comparison of signals from detectors 30, 40. Thus, the concn. of the concentrated cake is maintained at a fixed level.
|
