Study on hot gas spray cooling process by CFD method

The ability to predict the temperature, mass, and velocity history of a spray of droplets in a hot gas flow is important in the design of GCT. In this paper, the spray system in GCT is modeled by CFD method. The Eulerian and Lagrangian methods are two essentially different approaches for the modeling of disperse two-phase flows. Both methods have been implemented into the same computational fluid dynamics package, which is based on a threedimensional body-fitted finite volume method. The interaction between the discrete droplets and the average gas flow depending on the tower geometry is described for different drop size distributions. The continuous phase is resolved with the Realizable k–epsilon model. By using this model, it is possible to study the effect of droplet size distribution and properties of inlet flue gas on complete evaporation height, droplet velocity, droplet temperature, droplet size, species fraction at thought of spray zone. The results are evaluated with experimental data.