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This paper mainly focuses on the numerical simulation of particles trajectories aiming at obtaining the movement regulations of particles with different diameters. The article takes advantage of random orbital model of phase coupling under Lagrange coordinate, and figures out that the movement of small particles has large randomness, meanwhile particles with the same diameter and different initial positions can reach various final positions, some of which can escape or be captured from the exhaust pipe. Particles trajectory can be different even if it has same diameter and initial position. The conclusion of this thesis also puts forward that three different phenomena of presentation of gray ring, short-circuit of exhaust pipe and back-mixing of dust exhaust can appear under any conditions. Almost all large particles can be captured by the cyclone separator, and few particles show retention and short time rotation in the lower part of exhaust pipe.
The working condition of the spin-flash dryer agitating blade is complex, and influencing factors of the blade strength are quite more. In order to research its mechanical properties under the condition of transient high temperature, the analysis of thermal structure coupling field was performed. By the analysis of thermal stress and thermal deformation, the agitating blade would be designed well.
Adopting the RSM (Reynolds stress model) to conduct numerical simulation on gas phase flow field in bypass cyclone separators with two kinds of inlet structure, meanwhile, interphase coupling discrete model DPM is used to simulate the trace of particles in bypass cyclone separator. At last, the results demonstrate that the separating efficiency of separator B with a large length-width ratio inlet increased 1%~2% and the pressure drop is smaller when compared with separator A. A low average entering position and a short distance to the wall are helpful to improve the separating efficiency.
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