THEORETICAL STUDY OF THE PROCESS OF MIXING THE VARIOUS COMPONENTS IN THE WORKING CHAMBER OF THE DISINTEGRATOR

This article analyzes the movement of particles of different components in the inter-row space and in the peripheral part of the disintegrator's working chamber. The diagram of the disintegrator with the component loading unit and the diagram of the disintegrator's working chamber are presented. The loading unit consists of two screw feeders, which supply various components to the conical loading hopper. The capacity of the screw feeders is matched with the capacity of the hopper and the vertical cylindrical branch pipe. The mass capacity of the mixing chamber and the grinding of the disintegrator is determined. Mass throughput is determined using the functional dependence of the change in the bulk density of the material during its passage in the radial direction from the radius of scattering disk Rд to the radial size of the disintegrator body. It is determined that the mass throughput depends on the geometric (Rk, Rg, H) and technological (ϑ_r ) parameters of the disintegrator. The movement of the material in the working chamber of the disintegrator and the change in the concentration of the selected components of the mixture are presented on the basis of the cell mixing model. It allows to determine the concentration of the selected component of the mixture at the outlet of the body of the disintegrator in the tangential discharge pipe. According to expression, the concentration of the selected components of the mixture when passing through the disintegrator body of the presented construction is about half (0.57) of the initial value.

Limit pressure for a spherical vessel with a circumferential slot at its junction with a radial cylindrical protruding branch

One of the requirements of the two criteria method of safety assessment of a pressure vessel with a defect is an estimate of the plastic limit pressure. Here the defect is in a spherical shell close to its junction with a protruding radial cylindrical branch. The defect is assumed to be an axisymmetric circumferential slot of uniform depth on the outer surface of the shell. Lower bounds to the limit pressure are calculated for a wide range of geometries. The material is assumed to obey the von Mises yield criterion and a non-linear programming method is used to give optimum lower bounds. Data is supplied for spherical shell radius to thickness ratios from 25 to 100, nozzle radius to vessel radius ratios from 0 to 0.4, nozzle to vessel thickness ratios from 0.25 to 1.0 and ligament thickness to vessel thicknesses (ligament efficiencies) of 0 to 1. Slot widths vary from the significant to the infinitesimal, where it becomes a crack. Vessels of some proportions were shown to have their limit pressures reduced only a little by very low ligament efficiencies.