| 摘要 |
PURPOSE:To produce a coal/water slurry having an increased concentration and having a decreased coarse grain content, by adding an additive and water in particular proportions to pulverized coal prescribed with respect to the target values of crushing and pulverization and the compounding ratio of particular grain size. CONSTITUTION:Minute grains of pulverized coal having a maximum grain size of 200-150mu and having a gradient (n) of 1.0-2.5 with respect to Rosin- Rammler's diagram are blended with fine grains of pulverized coal having a 50% average grain diameter of 10-0.1mu in a minute grain to fine grain wt. ratio of 50:50-95:5. Then, an additive and water are added to the resulting blend in an amt. of 0.1-2.0% based on the wt. of the coal and 20-50% based on the total wt., respectively, thereby obtaining a desired coal/water slurry. The reason for the employment of pulverized coal having a gradient (n) of 1.0-2.5 with respect to Rosin-Rammler's diagram is that the max. grain size of 200-150mu means removal of large grains having an adverse effect on combustibility, and that with respect to coal having a problem in combustibility, especially, employing a classification point of 150mu enables the inhibition of the combustion to be minimized.
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