PRODUCTION OF COAL-WATER SLURRY

PURPOSE:To obtain a coal-water slurry which can be prepd. by the on-line method at low cost with high accuracy, by stimulating the viscosity of a slurry contained in a wet mill based on the data detected with respect to the driving current or driving power of the wet mill and controlling the amt. of the water to be fed in accordance with the viscosity. CONSTITUTION:Coal is fed from a coal hopper 1 through a metering feeder 2 into a cylindrical wet mill 3. Separately, water is fed from a water tank 11 trough a feed pump 10 into the cylindrical wet mill 3. The cylindrical wet mill 3 is driven by means of a mill driving motor 6 through a mill driving gear 4 and a reducer 5. The coal is mixed with water within the mill 3. The mixture is pulverized and is discharged in the form of a slurry. The discharged slurry is filtered with a filter 12 to remove foreign matter and is stored in a tank 13. In the above process, the electrical input of a mill driving motor is detected with a current detector 7. The value of the electrical input is input into the feed water controller 9. The amt. of water to be fed with a feed pump 10 is controlled with an output controlling signal from the feed water controller 9, thereby obtaining a slurry having a constant viscosity.