Fly ash scrubbing in a novel dual flow scrubber

Area of Science:

• Environmental Engineering
• Chemical Engineering
• Particulate Matter Control

Background:

• Increasingly stringent environmental regulations necessitate advanced particulate emission control technologies.
• Traditional scrubbers face challenges in achieving high removal efficiencies for fine particulate matter like fly ash.

Purpose of the Study:

• To investigate the performance of a novel dual flow scrubber for fly ash removal.
• To analyze the mechanisms and influencing variables of fly ash collection in a dual flow system.
• To develop predictive correlations for scrubber performance.

Main Methods:

• Experimental investigation of a dual flow scrubber with distinct bubble and spray sections.
• Systematic variation of operating parameters such as fly ash loading and liquid-to-gas ratio (QL/QG).
• Development and validation of mathematical correlations for predicting removal efficiency.

Main Results:

• The dual flow scrubber achieved nearly 100% fly ash removal efficiency (zero penetration) at a QL/QG ratio of 3.0 m3/1000 ACM.
• Removal efficiency varied between the bubble (decreased with loading) and spray (increased with loading) sections, indicating a need for operational balance.
• The spray section dominated overall performance, collecting finer particles, while the bubble section captured particles down to 20 micrometers.
• Developed correlations accurately predicted performance within +/-5.0% deviation of experimental values.

Conclusions:

• The novel dual flow scrubber effectively meets strict particulate emission regulations.
• The system demonstrates superior energy and efficiency compared to existing technologies.
• The developed correlations provide a reliable tool for predicting and optimizing scrubber performance.