3D numerical study of particle flow behavior in the impinging zone of an Opposed Multi-Burner gasifier

A3D model of the impinging zone of a commercial scale Opposed Multi-Burner (OMB) gasifier is established in this article, in which the gas flow and particle motion are simulated by the Eulerian-Lagrangian approach, and the gas turbulence is calculated using the realizable k-epsilon model. The particle collision is determined by the Direct Simulation Monte Carlo (DSMC) method and the modified Nanbu method, with the presumption that the particle is hard sphere. The model is validated with reference to the experimental result obtained on a laboratory device equipped with two opposed jets. The model reveals the concentration and mean velocity profiles of particles in the impinging zone. It is quantitatively observed that particles move at an accelerated speed from the jet and then at a rapidly decelerated speed near to the central impinging zone; particles are concentrated in the central impinging zone due to collision. (C) 2012 Elsevier B.V. All rights reserved.