Flowability of Coals by Jenike's Cell

Abstract

Problems of how to ensure a smooth flow of coals from huge silos is discussed using the flowability of 3 coals measured by Jenike's shear cell. The unconfined yield strength f_c varied with the moisture content and particle size of the coals. The flow-function was not so low as to cause doming during flowing, but it became critical affer consolidation for 55 days. the Kinematic angle of friction φ′ between the coals and the walls was also critical to assure a mass flow.
These results lead to the follownig subjects for further investigation:
1) Analysis of the effect of the moisture and size of coals on f_c and of the variation of φ′ with the kind of coals and wall.
2) A method of preventing fc from increasing during storage and of relieving the pressure which increases greatly during filling in huge silos and causes an increase in f_c.