Research on pneumatic conical separator

Cleaning the grain heap from impurities is carried out using air channels, sieves, trier cylinders and other separation principles. Air channels are the first to meet the flow of contaminated heaps, and therefore the most loaded working parts. This article is devoted to a theoretical study of the process of separating grain particles according to aerodynamic properties in a field of centrifugal forces. The purpose of the study is to determine the optimal design parameters and operating modes of a pneumatic separator for cleaning grain material from impurities. A diagram of the separator is shown indicating the main design dimensions. Taking into account the initial requirements for purification from impurities, conditions were formulated, after which a mathematical model was derived that displays the dependence of the completeness of separation of the grain heap on the design parameters of the separator, its operating mode and the properties of the grain material. Response surfaces were obtained - the dependence of the completeness of separation on the angle between the two generatrices of the cone, the height of the air supply from the bottom of the cone, the speed of air movement along the surface of the cone generatrix and the supply of a grain heap. The rational values of the above parameters of a conical air separator are determined: the angle between the two generatrices of the cone = 60°-70°, the height of the air supply from the bottom of the cone l = 0.03...0.05 m, the speed of air movement along the surface of the cone generatrix VB = 10 .5...12 m/s (with the value of the velocity component of the air at the outlet from the fan C2 = 13...16 m/s), with the amount of grain material supplied to the pneumatic separator per unit time q = 0...250 kg/h (0...1984 pcs. /with).