ANALYSIS OF THE FEATURES OF PNEUMATIC TRANSPORT INJECTION SYSTEMS WITH DRIVE FEEDERS DURING THEIR OPERATION IN TRANSIENT AND UNSTEADY MODES

EDN: EWXSDU

Abstract

The operation instability main causes and consequences analysis of charging pneumatic transport systems with continuous feeders (having a drive), taking into account their work in transient and unsteady periods, was carried out. The evidences of significant changes in the pneumatic transporting process parameters and an increased probability of instability in transient and unsteady state modes are given. The hypotheses explaining the essence of the phenomena occurring during the start-up of the pneumatic transporting were put forward. Mathematical models for describing the performance of sluice and auger receiving and feeding devices (sluice and screw feeders) were adjusted taking into account operation in transient modes. The reasons of increased material flow into the pipeline, extreme pressure and the appearance of a hump in the pressure diagram at the beginning of the pipeline during the start-up of the feeder and filling the pipeline with the transported material were analyzed. Literature( references) and experimental evidence confirming the ideas and hypotheses put forward were given.