In this project Dust Laden Flow was studied, covering its all possible intricacies. Flue Gas Duct of 210 MW Boiler was taken up to apply this study and try to find solution to the problem of erosion of its walls and possibility of exploring the modification to reduce pressure drop. Mathematical modeling was done and collection of data pertaining to both phases that is ash and gas was done. To establish initial and boundary conditions manuals were referred. Fluent software was used for computations using its inbuilt discrete phase model with two way coupling. Pressure and Velocity fields for gas and particles are generated. This is useful in knowing erosion zones and exploring possibility of reducing pressure drop as well as trajectories of particles on various zones.

2D and 3D modeling of Flue Gas Duct on FLUENT is done by dividing the entire domain into four sections namely APH outlet, Duct bend, Duct bifurcation and Distributor to study their features regarding particle laden flow. Pressure and velocity fields and the particle trajectories were obtained which show that APH outlet, Duct bend and Distributor sections have scope for modification.

Five modifications for Duct bend section were simulated and possibility of reduction in pressure drop is obtained.

Three geometries for preferential ash collection were modeled on 3D to find out the possibility of wake formation at floor without introducing significant pressure drop.

Effect of various parameters of particles was also studied and results are tabulated.

Keywords: Dilute flow, Eulerian - Lagrangian approach, Particle loading, Particle Tracks, Flue Gas duct