Computational Fluid\nDynamics Modeling and Analysis\nof Lime Slurry Drying in a Laboratory Spray Dry Scrubber

Drying is an important\nprocess found in different industries\nincluding\nspray dry scrubbing as used in flue gas desulphurization. Understanding\nthe fundamental processes in drying requires accurate description\nof turbulence and drying models, which is important in the design\nand optimization of new processes. Available research in spray dry\nscrubbing generally picks a single model to describe drying with the\nkey assumption that it is relevant to the case being studied. This\nwork does not make such an assumption but investigated the applicability\nof three drying models and three turbulence models in analyzing the\ndrying process in a laboratory spray dry scrubber. Computational fluid\ndynamics was used to model the process employing the Euler–Lagrangian\nframework. The results from validated models showed that the investigated\nhindered drying mechanistic model is superior to the often used <i>d</i><sup>2</sup> law and perfect shrinkage models and should\ntherefore be used preferentially in drying applications.