Three-dimensional numerical simulation of sintering flue gas desulfurization in bubbling tower

Flue gas desulfurization process for sintering process of iron and steel industry was numerically studied. Taking a 220 m2 sintering flue gas desulfurization tower as the object, based on the bubbling bed a 3D numerical model of gas-fluid flow coupling with desulfurization reaction was established for research. The influences of the Ca(OH)2 concentration, the superficial gas velocity, the inlet gas temperature, the SO2 concentration of inlet gas on the removal efficiency of sulfur dioxide were analyzed. Under the reference conditions, which include the superficial gas velocity of 0.11 m/s, the inlet gas temperature of 418 K, the SO2 concentration of inlet gas of 1 600 mg/m3, the Ca(OH)2 concentration of 0.614 mol/L and the slurry temperature of 323 K, the single operation parameter was changed individually. The results demonstrate that with the Ca(OH)2 concentration increasing from 0.1 to 0.614 mol/L, the removal efficiency of sulfur dioxide increases, while it decreases with the gas velocity increasing from 0.07 to 0.21 m/s and the inlet gas temperature changing from 377 to 445 K. With the increase of the SO2 concentration of inlet gas from 2 000 to 2 400 mg/m3, there is a slight fall in the removal efficiency of sulfur dioxide. ©, 2015, Southeast University. All right reserved.