초록 ▼

An improved coal pulverizer classifying system including a classifier cone extension to protect coal flow into the pulverizer from the annular fine-lifting airflow from the pulverizer throat. The classifier cone extension replaces traditional intermittent discharge structure, improving flow through

An improved coal pulverizer classifying system including a classifier cone extension to protect coal flow into the pulverizer from the annular fine-lifting airflow from the pulverizer throat. The classifier cone extension replaces traditional intermittent discharge structure, improving flow through the classifier system and reducing the disruptive effects of the discharge on the annular flow from the pulverizer throat. The pulverizer feedpipe outlet is located in the classifier cone extension, but above the throat of the extension to prevent interference between the feedpipe and the flow of coal through the extension. In a preferred form an adjustable clearance cone is mounted for vertical adjustment on the lower end of the feedpipe.

대표청구항 ▼

[ I accordingly claim:] [1.] In a coal pulverizer having a classifier system, the system including a coal feedpipe to deliver raw coal to pulverizing structure from an outlet spaced above the pulverizing structure, a classifier cone positioned around the feedpipe to deliver oversize coal to the pulv

[ I accordingly claim:] [1.] In a coal pulverizer having a classifier system, the system including a coal feedpipe to deliver raw coal to pulverizing structure from an outlet spaced above the pulverizing structure, a classifier cone positioned around the feedpipe to deliver oversize coal to the pulverizing structure from a classifier cone outlet spaced above the pulverizing structure, the pulverizer delivering ground coal to an upper end of the classifier cone by an upwardly-directed flow of air traveling around and above the pulverizing structure, the improvement comprising:a classifier cone extension extending from the classifier cone outlet into the pulverizing structure to a point where coal flow from the classifier cone extension is not affected by the flow of air up and around the pulverizing structure from the pulverizing throat, the cone extension having a throat, and the feedpipe outlet being positioned within the cone extension above the throat, wherein the feedpipe is mounted vertically within the classifier cone concentric with the cone extension and throat to define an annular reject fine flow path between the feedpipe outlet and the classifier cone extension above and adjacent the throat.