Patented Classifier Cone Extension | Improve Fineness

The Flapper Valves on the MPS & MBF Mills are designed to catch coal that has been rejected at the classifier level. The weight of the accumulated reject coal trips the Flapper Door and releases it for regrind.

Air flow studies show that coal released from the Flapper Assembly falls into the air stream and can be carried back through the classifier to be rejected again, thus short circuiting the classifier process. In some cases the Flapper Door sticks open allowing coal to blow back through the door. SAS Global designed a replacement kit that will eliminate the Flapper Assembly and problems associated with it. We call it the SAS Classifier Cone Extension Kit.

The illustration shows the cone has been extended, forcing the coal to the center of the bowl. A cylinder extends from the bottom of the cone directly into the heart of the grinding zone. Test have shown an 11-12% improvement in fineness over mills using old style Flapper Assemblies.

The Classifier Cone Extension can be installed in one 10 hour shift with three men. Installations does not require removal of the roll wheels.