Comparative study on direct and indirect methods for wet desulphurisation and denitrification based on micro-nano...

Area of Science:

• Environmental Science
• Chemical Engineering
• Atmospheric Chemistry

Background:

• Flue gas desulphurisation and denitrification are critical for air pollution control.
• Micro-nano bubble technology offers a novel approach to wet scrubbing processes.
• Understanding the comparative performance of different methods is essential for industrial application.

Purpose of the Study:

• To compare the performance, advantages, and disadvantages of the D-method and I-method for wet desulphurisation and denitrification using micro-nano bubbles.
• To investigate the impact of initial pH and temperature of absorption liquids on NO and SO2 removal efficiencies.
• To evaluate the economic and operational feasibility of each method for flue gas treatment.

Main Methods:

• Comparative analysis of D-method and I-method using piped water, Na2SO3, and HA-Na as absorption liquids.
• Experimental investigation of the effect of initial pH and temperature on pollutant removal efficiency.
• Assessment of NO and SO2 removal rates under identical experimental conditions.

Main Results:

• Both D-method and I-method showed similar SO2 removal efficiencies.
• D-method demonstrated significantly higher NO removal efficiency compared to I-method.
• Increased initial pH positively correlated with NO/SO2 removal efficiencies, while heating the absorption liquid inhibited removal.

Conclusions:

• D-method offers superior NO removal but requires larger, more costly equipment for high gas volumes.
• I-method presents a more cost-effective alternative, avoiding the limitations of micro-nano bubble generator capacity.
• Optimizing pH is crucial for enhancing desulphurisation and denitrification, while temperature control is necessary to maintain efficiency.