Application of an Euler-Lagrange Method to an Industrial Incinerator

Abstract

In an industrial incinerator, suppression of ash emission is of great importance from a viewpoint of environment preservation. In some of the incinerators, a control plate is equipped to suppress the ashes, where it is designed based on engineers’ experience. The control plate is assumed to recoil the ash particles. On the other hand, effect of the control plate has not been examined sufficiently, and besides behavior of ash particles has not been figured out in the incinerator. This is because the incinerator scale is so large that validation tests cannot be performed. In the present study, a numerical technology is applied to an industrial incinerator to examine the effect of the control plate and to analyze the ash particle behavior. In the numerical simulations modeling of an arbitrary shape wall boundary and large-scale simulation technique are required. In this study, advanced DEM-CFD method is employed, where coarse grain model of the DEM is used as scaling law modeling and signed distance function and immersed boundary method are applied to arbitrary shape wall boundary in the DEM-CFD method. The numerical simulations illustrate that the control plate works effectively, whereas, against all expectations, the ash particles are shown to remain in the incinerator not by collision to wall but by settling on the plate due to vortex.