| 摘要 |
PROBLEM TO BE SOLVED: To reduce a moisture content of a discharge cake by enhancing the flow of a liquid staying in a precipitation layer in a discharge port direction in a decanter type centrifugal separator. SOLUTION: The centrifugal separator is provided with a cylindrical bowl 1; and a screw conveyor 10 rotating coaxially to the bowl 1 in the same direction with a rotation speed difference in the bowl 1. The precipitation layer (b<SB>1</SB>) is separated from a treatment liquid (a) fed into the bowl 1 by centrifugal force, the discharge cake (b<SB>3</SB>) is discharged from a discharge port 7 provided near a bowl inner peripheral wall at one side of the bowl 1 and a separation liquid (c) is discharged from a discharge port 8 at the other side of the bowl 1. Projections 23 and 24 are provided on an outer peripheral surface of a rotation body 11 of the screw conveyor 10 and a helical impeller 12. A void is formed in the precipitation layer (b<SB>2</SB>) and easily makes the liquid staying in the precipitation layer (b<SB>2</SB>) flow in an axial and discharge port 8 direction. Since the separation liquid (c) staying in the precipitation layer (b<SB>2</SB>) is mixed into the discharge cake (b<SB>3</SB>) and is discharged, the water content is not reduced. COPYRIGHT: (C)2007,JPO&INPIT
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