Transient simulation of gaseous particle/droplet laden flows in industrial-scale devices for flue gas cleaning including two-way mass and enthalpy coupling

Abstract

Paper presented at the 5th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, South Africa, 1-4 July, 2007.

The method of computational fluid dynamics (CFD) is applied to spraying processes with strong enthalpy coupling. Focus is brought to industrial scale applications in the field of environmental engineering. A transient 3D finite volume solver is used, wherein the disperse phase is modeled within an Lagrangian framework. Two-way mass and enthalpy coupling is taken into account. Resulting limitations of the traditional sequential model droplet integration approach are discussed, which potentially lead to thermodynamically inconsistant or oscillatory solutions, especially in zones of dense spray. As an alternative a combined sequential-simultaneous solution algorithm is proposed. Thus obtained results show sufficient aggreement with a validated test case. Application to industrial scale reactors in the field of flue gas cleaning are demonstrated exemplarily.