Borshch Y. Substantiation of process parameters and development of pneumatic separating channel of grain separators

In the thesis decided the scientific task, which is aimed at improving the efficiency of process of grain mixtures cleaning by pre-stratification on the pneumatic separating channels of drum grain separators. For this purpose in the pneumatic separating channel before the basic vertical channel device, representing the permeable scaly surface is established. Particles of light impurities under influence of delamiring device are redistributed in the grain mixtures layer, concentrating in its upper sublayers. The formed layer of grain mixture of a greater thickness is sent to the main vertical pneumatic separating channel, where it is cleaned by aerodynamic properties. This allows to increase the specific loading of the pneumatic separating channel, which intensifies the process of cleaning grain mixtures on grain separators. Mathematical modelling of grain mixes movement in working zones of developed pneumatic separating channel is based on interaction of phases of continuous mediums according to the rheological laws taking into account preliminary of grain mixes. The equations of motion of two-phase polydisperse medium were constructed with the help of which the regularities of particle velocity of grain mixtures and the coefficient of its stratification on the scaly air permeable surface were established. The conditions and parameters of fluidized of grain mixes, which determine the effectiveness of its stratification on the developed pneumatic separation channel are grounded. It has been established that the increase of the speed of blowing by air flow of grain mixture on the scaly surface of developed pneumatic separating channel, reduction of particle density of grain mixtures and the height of its layer, increase the stratification coefficients by 20...35%