MBF-23型磨煤机动态分离器的改造

针对MBF一23型磨煤机煤粉细度调节性能差、煤粉颗粒偏粗且均匀性不佳等问题．对其进行了分离器改造，把原有的静态折向门挡板改成动态分离器。分离器改造前后的对比试验表明：动态分离器调节性能要优于静态折向门挡板，提高了煤粉管内煤粉的均匀性；获得相同煤粉细度时，动态分离器改造后的磨煤单耗要小于改造前；煤粉细度R，，相同的情况下，改造后的磨煤机出口煤粉管中150μm以上的煤粉颗粒量要少于改造前，有利于减少飞灰中的未燃尽碳量。

Retrofit for Dynamic Separator of MBF-23 Coal Pulverizer

In view of poor performance of fineness adjustment of MBF-23 pulverizer and coarse pulverized coal, the separator is retrofitted by replacing baffle of deflector with dynamic separator. The comparative ex- periment of the separator before and after the retrofit shows that the adjustment performance of dynamic sepa- rator is superior to that of baffle of deflector, and uniformity of dust coal is improved. In case of the same coal fineness, unit consumption for pulverization after retrofit is less than that before retrofit. At the same pulverized coal fineness R75, pulverized coal particles above 150 p~m at outlet of dust coal pipe after retrofit are less than that before retrofit, which helps reduce unburned carbon in flying ash.