Classifier vane for coal mills

For use in a classifier cage of the type used in bowl mill pulverizers to direct a flow of coal fines and air into a classifier cone, the classifier cage having a circumferential inlet for receiving a flow of coal fines from a pulverizer throat, an improved classifier vane comprising:

• a classifier vane adapted to be mounted in the classifier cage inlet, the classifier vane having a mounting portion adapted to be mounted in the classifier cage inlet, and a generally trapezoidal deflector surface portion extending radially into and downwardly in the classifier cone with a lower end extending below the classifier cage inlet to form a coal-directing extension when the vane is mounted in the classifier cage inlet, the deflector surface portion being angled inwardly relative to the classifier cone surface about a bend line dividing the mounting portion from the deflector surface portion, wherein the bend line is vertical.

For use in a classifier cage of the type used in bowl mill coal pulverizers to direct a flow of coal fines and air into a classifier cone, the classifier cage having a circumferential inlet for receiving a flow of coal fines from a pulverizer throat, an improved classifier vane comprising:

• a classifier vane adapted to be mounted in the classifier cage inlet, the classifier vane having a mounting portion adapted to be mounted in the classifier cage inlet, and a generally trapezoidal deflector surface portion extending radially into and downwardly in the classifier cone with a lower end extended below the classifier cage inlet to form a tangential coal-directing extension when the vane is mounted in the classifier cage inlet, the trapezoidal deflector portion being angled inwardly relative to the classifier cone surface about a bend line dividing the mounting portion from the deflector portion.

For use in a classifier cage of the type used in bowl mill coal pulverizers to direct a flow of coal fines and air into a classifier cone, the classifier cage having a circumferential inlet for receiving a flow of coal fines from a pulverizer throat, an improved classifier vane comprising:

• a classifier vane adapted to be mounted in the classifier cage inlet, the classifier vane having a lower end designed to extend below the level of the classifier cage inlet to form a coal-directing extension into the classifier cone when the vane is mounted in the classifier cage inlet, wherein the vane comprises an inner vane surface set at a first angle relative to the flow of coal fines past the vane, and further comprises an outer vane surface set at a second greater angle relative to the flow of coal fines past the vane.

For use in a classifier cage of the type used in bowl mill coal pulverizers to direct a flow of coal fines and air into a classifier cone, the classifier cage having a circumferential inlet for receiving a flow of coal fines from a pulverizer throat, an improved classifier vane comprising:

• a classifier vane adapted to be mounted in the classifier cage inlet, the classifier vane having a lower end designed to extend below the level of the classifier cage inlet to form a coal-directing extension into the classifier cone when the vane is mounted in the classifier cage inlet, wherein the vane comprises an inner vane surface set at a first angle relative to the flow of coal fines past the vane, the inner vane surface being angled about a bend line beginning at an upper edge of the vane and extending at an angle outwardly toward the lower end of the vane.

For use in a classifier cage of the type used in bowl mill coal pulverizers to direct a flow of coal fines and air into a classifier cone, a classifier cage having a circumferential inlet for receiving a flow of coal fines from a pulverizer throat, an improved classifier vane comprising:

• a classifier vane adapted to be mounted in the classifier cage inlet, the classifier vane having a mounting portion adapted to be mounted in the classifier cage inlet, and a generally trapezoidal deflector surface portion extending radially into and downwardly in the classifier cone with a lower end extended below the classifier cage inlet to form a coal-directing extension when the vane is mounted in the classifier cage inlet, the trapezoidal deflector portion being angled downwardly and inwardly relative to the classifier cone surface about a bend line dividing the mounting portion from the deflector surface portion, wherein the deflector surface portion further includes a secondary deflector surface formed by a secondary bend line in the deflector surface portion.

For use in a classifier cage of the type used in bowl mill coal pulverizers to direct a flow of coal fines and air into a classifier cone, the classifier cage having a circumferential inlet for receiving a flow of coal fines from a pulverizer throat, an improved classifier vane comprising:

• a classifier vane having a mounting portion adapted to be mounted in the classifier cage inlet, and a deflector surface portion with a generally trapezoidal outer edge widening toward the lower end of the vane, the trapezoidal outer edge being extended below the level of the classifier cage inlet to form a tangential coal-directing extension designed to extend downwardly and inwardly into the classifier cone when the vane is mounted in the classifier cage inlet.