Numerical simulation of gas-liquid flow state in scrubber of novel centrifugal flue gas desulfurization tower
新型离心式脱硫塔气液两相流数值模拟

Computational fluid dynamics (CFD) software FLUENT and SIMPLE algorithm was used to simulate the two-phase flow in a centrifugal flue gas desulphurization spray tower. The RSM turbulence model was adopted to describe the gas phase,while the particle stochastic trajectory model in Lagrange coordinate system was used to describe the liquid phase. The calculation results showed that the flow field was characterized by a strong cyclone. Gas flow diameter, capacity and velocity influenced spraying droplet distribution. The greater the spray droplet size and the smaller the spray volume, the greater the gas flow rate was, the lesser cool entrance was. The average concentration above the section of the tower increased with droplet size decreased, enhanced with vapor-liquid ratio increased, increased to the top firstly and then decreased with gas flow rate increased. When the spray droplets ranged from 0.5 mm to 1 mm, the spray droplets played a better role in purifying and cooling the tower entrance, and could also cover a high concentration at z = 4.15 m.When the droplet was small, reducing the amount of flue gas flow rate and increasing the capacity of spraying liquid droplets could further improve the desulphurization efficiency. The calculated gas flow was corresponding to experimental data, which validated the suitability of using RSM and particle stochastic model to simulate two-phase flow in the scrubber. The results provided references for separator structure optimization.