GRAVITATIONAL SETTLING TANK AND PRODUCTION METHOD FOR ASHLESS COAL USING THE SAME

摘要

PROBLEM TO BE SOLVED: To detect the boundary surface of a liquid concentrate of solids content.SOLUTION: A multipoint temperature sensor 18 that comprises a plurality of thermocouples 17 and that determines the temperature of an internal liquid inside a pressurized container 11 is provided to the pressurized container 11. A plurality of the temperature-determining contact points 17a of the thermocouples 17 are arranged inside of the pressurized container 11 at differing heights so as to be immersed in an internal liquid. The boundary surface of the liquid concentrate of solids content is detected on the basis of the temperature distribution of the internal liquid in the pressurized container 11 as determined by the multipoint temperature sensor 18.