The Analysis Of Rotor Dynamics And Static Strength Of HCG With ANSYS

Heat-resisting centrifugal granulator (HCG) is a kind of granulating machinery used for pelletizing blast furnace slag which is solid waste from blast furnace. As one method of dry granulation, HCG can recover the sensible heat retained in molten slag effectively, save a mount of water and not pollute the environment, and possess the characteristic of simple structure and high efficiency. Since HCG is working at high speed and high temperature, it is significant to investigate its vibration performance, the intensity of turn-plate under structure thermal stress, and determine whether it works safely and reliably. This is of great theoretical significance and practical value to our design, manufacture and application of the equipments used to dispose blast furnace slag.In this paper, the development and actualities of research on rotor dynamics are reviewed firstly. Then the operating principle of HCG is introduced. All the analysis projects, including the finite element model, are completed in APDL command stream with ANSYS. Then the dynamic analysis of HCG's rotor including gyroscopic effect and the intensity of the turn-plate under the load of thermal stress and centrifugal stress are discussed mainly. Specific content as follows:(1) Some first natural frequencies and modes are calculated from modal analysis and we obtained rotor's critical speed through CAMPBELL diagram, from which we can find out whether the rotor avoid the region of sympathetic vibration effectively.(2) Through changing the structural parameters of the principal axis system, we obtain the effect of each parameter on the critical rotational speed. The parameters include bearing stiffness, span of bearings and weight of turn-plate.(3) Amplitude-frequency response is also acquired through harmonic analysis, which reflects how amplitude changes with the rotor speed.(4) We performed transient unbalanced analysis to inspect the rotor response at different startup accelerations and give the optimum starting time.(5) Through calculating the temperature distribution of the turn-plate, we acknowledge the heat insulation effect of the refractory lining.(6) The optimization of the turn-plate was performed to meet the strength requirements, and then we calculated the critical speed and the temperature distribution of the turn-plate again.