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How is coal pulverized in the ball mill?

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in Energy Engineering by (91.0k points)
How is coal pulverized in the ball mill?

(a) By rotating the cylinder

(b) By rolling the cylinder

(c) By hammering the cylinder

(d) By jolting the cylinder

This question was posed to me in final exam.

This key question is from Pulverised Mills in chapter Steam Power Plant of Energy Engineering

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The correct choice is (a) By rotating the cylinder

To explain I would say: The pulverization in ball mill takes place as a result of action between the balls and coal, as the cylinder they are put in is made to rotate. The cylinder is partly filled with various sized steel balls. The cylinder is rotated at a velocity of 130 m/min periphery.

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