Cold gas analysis of a waste-gas incinerator to enhance mixing capabilities using CFD

Abstract

Paper presented to the 10th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Florida, 14-16 July 2014.Reducing the combustion length, improving the flame stability, generating sufficient vortical recirculation zones, and extending the durability of furnace insulation are some reasons to target swirling flow in combustion chambers with sufficient swirl characteristics. These reasons aim to increase the species residence time and improve the mixing quality in the related combustion chambers. As is known, burning the waste-gas material in incinerators can produce toxic pollutants. Nevertheless, one main objective in incineration combustor is to improve the flow mixing characteristics. Our concern in this paper is to improve the mixing characteristics of one available incinerator with some unsuitable pollution using the CFD simulation. We study the flow patterns and analyze the mixing quality to monitor the influence of waste-gas inlet crosssections and its position into the incinerator chamber. The degree of mixing is analyzed using the standard deviation parameter, which determines the homogeneity of the fuel mixture fraction in the incinerator chamber. The improvement of mixing characteristics and increasing the residence time in the incinerator are two important factors, which are suitably elaborated and discussed in this paper. The mixing study is provided for cold gas assumption.