[Particle trajectory model desulfurization spray tower used in numerical simulation of flue gas].
The commercial computational fluid dynamics (CFD) software FLUENT is used to predict the two-phase flow in a flue gas desulfurization (FGD) spray tower. The Euler-Lagrange method is used, in which the gas flow is described with standard k-epsilon turbulence model, and the motion of the liquid droplets is described with the particle trajectory model. The procedure of model definition, including force analysis of liquid particle, gas turbulent dispersion and the gas-liquid coupling method, is presented. The results show that the uniformity of axial gas velocity in the spray tower is satisfactory, and the hollow spray nozzle used in the tower can efficiently prevent short-circuiting of the flue gas. The concentration of liquid droplets in the central region is higher than near the wall, and this problem can be solved by optimizing the arrangement of the spray nozzles near the wall. Model predictions for particle trajectory are shown to be in good agreement with experimental results, and the particle trajectory model can predict the two-phase flow in the spray tower successfully.
Zhao
Zhe
Z
Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China.
Tian
He-zhong
HZ
Hao
Ji-ming
JM
Zhang
Hua
H
Liu
Han-qiang
HQ
D000392:Air Movements; D000393:Air Pollutants / Q000737:chemistry / Q000302:isolation & purification*; D003198:Computer Simulation; D005740:Gases; D008962:Models, Theoretical; D010316:Particle Size; D013455:Sulfur / Q000737:chemistry / Q000302:isolation & purification*; D013458:Sulfur Dioxide / Q000737:chemistry / Q000302:isolation & purification
D000393:Air Pollutants; D005740:Gases; D013458:Sulfur Dioxide; D013455:Sulfur