Modeling of SO(2) scrubbing in spray towers

Area of Science:

• Chemical Engineering
• Environmental Engineering
• Fluid Dynamics

Background:

• Industrial processes generate sulfur dioxide (SO2), a major air pollutant.
• Effective SO2 removal is crucial for environmental protection and regulatory compliance.

Purpose of the Study:

• Develop realistic models for SO2 gaseous removal via absorption in spray towers.
• Analyze the impact of operational parameters on SO2 scrubbing efficiency.

Main Methods:

• Theoretical modeling of gas-liquid absorption with and without chemical reaction.
• Simulation of spray tower performance considering droplet size, velocity, gas velocity, liquid flow rate, and tower height.
• Analysis of four distinct flow regimes: droplet lean, dense droplet, rigid droplet, and droplet inertia controlling.

Main Results:

• Identified droplet diameter and velocity as critical factors influencing gas scrubbing performance.
• Determined the existence of a rigid droplet regime under specific conditions.
• The droplet inertia-controlling regime demonstrated optimal scrubbing performance.
• Model predictions showed good agreement with experimental data for smaller droplets and lower flow rates.

Conclusions:

• The developed models provide insights into SO2 removal mechanisms in spray towers.
• Operational parameters significantly affect the efficiency of gas scrubbing processes.
• The models are adaptable for other gas-liquid spray absorption systems with appropriate modifications.