PREPARATION OF COAL OIL MIXTURE

PURPOSE:Not to discharge coal oil mixture unsuitable for quality such as particle size, etc., to shorten preparatory time in starting, to raise the utilization efficiency of plant, by grinding and blending coal again by the same device oil mixture fuel obtained by grinding coal in oil, raising the temperature of the mixture, grinding it. CONSTITUTION:The device 1 for grinding and blending is charged with coal and oil in a blending ratio usually to give 50% dry coal concentration, the coal is ground and blended with the oil, the total amount of the coal oil mixture is circulated through the circulation path 9 to the device 1, treatment of grinding and blending is carried out again for a proper time, the circulation is stopped and steady operation is started. At this point, the mixture is raised to the given temperature by accumulative heat of grinding heat, etc., and the coal is ground into the target particle size, to give the desired coal oil mixture fuel. If necessary, a precipitation inhibitor is added to the mixture by the path blender 4, to prevent clogging in the circulation path 9.