Coal flow distribution controllers for coal pulverizers
A solid particle flow distribution controller includes an extension skirt configured to be mounted to a discharge skirt at a division between an upstream solid particle conveyance pipe and a plurality of downstream pipes. The extension skirt includes a plurality of circumferential segments. Each segment is movably mounted to the discharge skirt for movement in an upstream and downstream direction with respect to the discharge skirt. The segments of the extension skirt are configured and adapted for motion in the upstream and downstream direction independent of one another to extend upstream of the discharge skirt as needed to improve solid particle distribution among the downstream pipes.
1. A solid particle flow distribution controller comprising:
an extension skirt configured to be mounted to a discharge skirt at a division between an upstream solid particle conveyance pipe and a plurality of downstream pipes, the extension skirt including a plurality of circumferential segments, each segment movably mounted to the discharge skirt for movement in an upstream and downstream direction with respect to the discharge skirt, wherein the segments of the extension skirt are configured and adapted for motion in the upstream and downstream direction independent of one another to extend upstream of the discharge skirt as needed to improve solid particle distribution among the downstream pipes.
2. A solid particle flow distribution controller as recited in claim 1 , wherein the circumferential segments are mounted inside the discharge skirt so when moved into a downstream position the circumferential segments are radially inward of the discharge skirt.
3. A solid particle flow distribution controller as recited in claim 1 , wherein the circumferential segments are mounted to the discharge skirt by way of tracks configured to guide movement of the circumferential segments.
4. A solid particle flow distribution controller as recited in claim 1 , wherein each circumferential segment is operatively connected to an actuator for moving the circumferential segment, wherein the actuator is selected from the group consisting of a manual actuator, an electrical actuator, a pneumatic actuator, and a hydraulic actuator.
5. A solid particle flow distribution controller as recited in claim 1 , further comprising:
a coal classifier having an inlet and a discharge skirt having a plurality of outlets, wherein the extension skirt is mounted proximate an upstream portion of the discharge skirt, substantially concentric therewith, wherein the segments of the extension skirt are configured and adapted for motion in the upstream and downstream direction independent of one another to extend upstream of the discharge skirt as needed to improve coal particle distribution between the outlets of the discharge skirt.
6. A solid particle flow distribution controller as recited in claim 5 , wherein the discharge skirt has an interior divided into a plurality of circumferentially segmented chambers by a set of partition plates mounted within the discharge skirt for dividing flow from the inlet to a plurality of outlet pipes downstream of the coal classifier, wherein the segments of the extension skirt are configured and adapted for motion in the upstream and downstream direction independent of one another to extend upstream of the discharge skirt as needed to improve coal particle distribution between the chambers of the discharge skirt.
7. A solid particle flow distribution controller as recited in claim 5 , further comprising a feed pipe extending through the coal classifier along a centerline thereof.
8. A solid particle flow distribution controller as recited in claim 5 , further comprising a center pipe mounted within the classifier for control of an adjustable return baffle for prevention of reverse air flow through the classifier or re-entrainment of coarse particles.