Among the power-plant problems which are gradually being solved, the present study of moving coal from the bunkers to stokers or coal-pulverizing mills is important, for with the use of one boiler only for each turbine generator, the prevention of coal stoppages in chutes is vital. During the war years, the use of coal from lot storage, with consequent moisture absorption, has caused a great deal of ratholing and arching in the bunkers, and frequent stoppages have occurred in the chutes. The experimental investigation, reported, involved a study of the flow and stoppage of coal in a transparent scale model of one of the present chutes; measurements of physical properties of lot coal with relation to possible factors affecting stoppage; development in successive steps of a new design of coal chute in scale-model form. Out of this study a suitable chute design was evolved, now being reproduced full scale for installation and test.
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Wolf et al. (1945) studied this question.
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