AERODYNAMIC RESISTANCE OF A BALL-TUBE MILL DURING TRANSPORT OF A POLYDISPERSE COAL GAS SUSPENSION

Analysis of experimental data on aerodynamic resistance of a ball-tube mill is given. It is shown that this resistance has two components brought about by the pressure losses resulting from the injection of dust particles into the main fl ow after coal grinding and from the transport of homogeneous gas suspension fl ow. A dimensionless equation has been obtained for the dependence of the pressure loss in flow of a homogeneous dust–air mixture on Reynolds number. Functional dependences of the mean-square velocity of the fl oating of coal particles and of their average diameter on the polydispersity parameters of coal dust have been found. An empirical dependence of pressure loss due to the injection of a polydisperse coal gas suspension into the main fl ow on the average velocity of fl oating of coal particles, their average size, and on the size of the mill has been obtained.
   
Author:  S. D. Ivanov, A. N. Kudryashov, and V. V. Oshchepkov
Keywords:  ball-tube mill, aerodynamic resistance, gas suspension, coal dust, grinding, floating velocity, pressure loss
Page:  349