METHOD AND DEVICE FOR UNIFORMLY DISTRIBUTING COAL PULVERIZED IN MILL TO A PLURALITY OF BURNERS

摘要

PURPOSE:To uniformly distribute pulverized coal to a plurality of pulverized coal burners with a suitable solids/gas ratio by modulating the pulverized coal concentration distribution pattern in a distributor with time to equalize the time-sequent average level of the pulverized coal concentration at respective fuel pipe inlets. CONSTITUTION:A guide vane 32 which cuts through a part of the distribution pattern is disposed in a distributor 4, and is rotated at a constant speed by a motor. A solids/gas double-phased flow introduced from the bottom of the distributor 4 has a certain pulverized coal concentration distribution pattern, and moves upwardly through the guide vane 32 as it retains the concentration distribution. Since the guide vane 32 is rotating, the concentration distribution pattern is circumferentially displaced by a rotational angle of the guide vane 32 over the time period for the double-phased flow to pass through the guide vane 32. As the motor speed is determined by random numbers generated at regular intervals, the concentration pattern is randomly changed. Therefore, the time-sequence average level of the pulverized coal concentration near respective fuel pipe inlets is equalized.