ramin Moradi - Ferdowsi University of Mashhad
Amin Deyranlou - Ferdowsi University of Mashhad
Mohammad Moghiman - Ferdowsi University of Mashhad

This paper presents a numerical study of the gas–powder flow in a typical Lapple cyclonewith division of gas and particle flow in a vortex finder. The Navier-Stokes equations alongwith the RNG k-ε turbulent model are solved numerically. The separation efficiency and thetrajectory of particles are simulated and the effects of the particle size on the separationefficiency and the particle residence time are investigated. The effect of the particle density onthe particle size in the range which results 100% cyclone separation efficiency and particleresidensce time is investigated. Large particles generally have a higher concentration in thewall region and small particles have a higher concentration in the inner vortex region.Particles enter from different sides give different separation efficiency and trajectory. Aparticle with a size exceeding a critical diameter or a critical density would stagnate on thewall of the cyclone’s cone. This phenomenon is regarded as a main reason for the depositionon the inner conical surface in such cyclones used in cement industry.

Cyclone, Gas-solid flow, Particle separator, Computational fluid dynamics, RNG model