Analyzing the Dynamic Performance of the Two-Stage Pusher Centrifuge

Mechanical filtration of solid and liquid phases with the help of a centrifuge mechanism is a common operation in industries, particularly for salt dehydration. The process is mainly based on the centrifuge action between particles and fluids. Currently, most of the studies have been performed on single-stage centrifuges while there it is required to know and analyze the behavior of the multi-stage pusher centrifuges in order to optimize their efficiency. The structure and dynamic performance of the two-stage pusher centrifuge device have been analyzed in the current study in three phases: modal, particle behavior, and transient state dynamics analysis. The results of the modal analysis have demonstrated that the safety margin obtained in the context of the resonance occurrence for the internal basket set and subset due to linear and rotational inertial forces has been . Based on the results of the transient dynamics analysis, the stability of the particle behavior has been about  or  of the particle feeding time, the maximum displacement at the critical point of the inner basket subset has been , and the critical stress value has been about ; which has been acceptable in terms of mechanical strength of the assembly versus the stresses and strains caused by the operation of the device. Thus, it is recommended based on the results to maintain the maximum rotational motion (36.68 rad/s) and no significant change in the particle feeding rate compared to the specified value (0.56 kg/s).