Classifier, crushing classifier and pulverized coal combustion boiler

摘要

The classifier includes a classifier housing configured to draw an airflow from below in an outer peripheral region of an inner space, a classifier housing rotatably installed in the inner space of the classifier housing on an inner peripheral side of the outer peripheral region, Wherein the annular rotating portion includes a plurality of rotating fins arranged with a gap around the rotating shaft of the annular rotating portion, and the plurality of rotating fins The outer shape of the annular rotating portion formed has a maximum outer diameter portion between the upper end and the lower end of the annular rotating portion.;