| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for preventing clogging of a water discharging part due to hydrate growth.SOLUTION: A hydrate slurry s is introduced in a screw press dehydrator 3 to form a cake a of a hydrate in the upstream side of the screw press dehydrator 3; the cake a is transported to the downstream side of the screw press dehydrator 3 to make a water stop cock b; the hydrate slurry s is made to reside in the screw press dehydrator 3 by utilizing the water stop cock b; then, the hydrate slurry s is introduced to the screw press dehydrator 3 in a constant flow amount, and the rotation of the screw press dehydrator 3 is controlled so that the differential pressure &Dgr;P between the feed pressure of the hydrate slurry s and the discharge pressure at which the slurry s is discharged from the screw press dehydrator 3 is made to be constant. |
