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International Journal of Energy for a Clean Environment
SJR: 0.195 SNIP: 0.659 CiteScore™: 1.2

ISSN Print: 2150-3621
ISSN Online: 2150-363X

International Journal of Energy for a Clean Environment

Formerly Known as Clean Air: International Journal on Energy for a Clean Environment

DOI: 10.1615/InterJEnerCleanEnv.v10.i1-4.20
pages 15-36

COMPUTATIONAL EVALUATION OF WALL RINGS IN WET FLUE-GAS DESULFURIZATION PLANTS

C. Montanes
Fluid Mechanics Group (University of Zaragoza) and LITEC (CSIC), Maria de Luna 3, 50018 Zaragoza, Spain
A. Gomez-Samper
Fluid Mechanics Group (University of Zaragoza) and LITEC (CSIC), Maria de Luna 3, 50018 Zaragoza, Spain
Norberto Fueyo
Fluid Mechanics Group, University of Zaragoza, and LITEC (CSIC), Spain
J. C. Ballesteros
ENDESA Generacion SA, Ribera del Loira 60, 28043 Madrid, Spain
P. Gomez-Yague
ENDESA Generacion SA, Ribera del Loira 60, 28043 Madrid, Spain

ABSTRACT

A wet flue-gas desulfurization plant was simulated using a finite-volume commercial computational fluid dynamics (CFD) code with some extensions. An Eulerian model was used to model the gas phase, while the slurry was simulated using a Lagrangian approach. A mathematical model was formulated and implemented to simulate the SO2 absorption by the slurry droplets, taking into account the influence of the Reynolds and Schmidt numbers and the temperature. The influence of the mist eliminators was accounted for by introducing a pressure loss which is dependent on the magnitude of the axial velocity. The results from the model are in good agreement with the measurements provided by the plant operators (velocity contours at the absorber entrance and contours of sulfur dioxide at the absorber outlet). The effect on the overall absorption of installing peripheral wall rings was evaluated, resulting in an efficiency improvement of about four percentage points, but penalizing the global pressure loss by about 8%, depending on the operating conditions. A wide-ranging parametric study was carried out, varying physical parameters, such as operating conditions; numerical parameters, such as the mesh size and the wall-droplet interaction; and geometrical designs, such as the wall ring size.


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