Abstract
A method is described for the design of a prism-shaped insert which is equipped in a rectangular converging hopper over its outlet in order to prevent the formation of a static stable arch in a cohesive powder. The critical span of the static arch is estimated from Jenike's procedure that is modified on the basis of static stresses developed during the initial fill of the hopper, using with results of a fixed volume direct shear test.Safety factors are considered in regard to the size of the hopper outlet and the span of the wedge-type channel constructed around the prism-shaped insert. When the values of the safety factors are given, the optimum dimensions of the prism-shaped insert are determined.A prism-shaped insert of 700mm in width and 2180mm in length is designed in order to initiate the discharge of wet coals from existing rectangular bunkers with a capacity of 640m3 and a hopper outlet of 615mm in diameter. It did so with complete success.
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