Research on plasma modified fly ash denitration

Area of Science:

• Environmental Science
• Chemical Engineering
• Materials Science

Background:

• Fly ash, a byproduct of coal combustion, presents disposal challenges.
• Modified fly ash can be utilized for environmental remediation, such as NOx removal.
• Plasma technology offers a promising approach for treating industrial emissions.

Purpose of the Study:

• To investigate the denitration rate of modified fly ash using dielectric barrier plasma.
• To analyze the influence of reactor and process parameters on NOx removal efficiency.
• To elucidate the denitration mechanism on the surface of modified fly ash.

Main Methods:

• Utilized a dielectric barrier plasma reactor for denitration experiments.
• Employed orthogonal experimental design to study various parameters.
• Characterized modified fly ash using SEM, BET, XRD, Boehm titration, and FTIR.
• Applied variance analysis and linear regression to analyze experimental data.

Main Results:

• Input power and discharge gap significantly affect the denitration rate.
• Basic groups positively correlate with denitration rate, while adsorption pore size and acidic groups show negative correlation.
• Linear regression model explained 78.9% of the variation in denitration rate.
• Chemical adsorption is the dominant denitration mechanism, contributing approximately 60.86%.

Conclusions:

• Optimizing input power and discharge gap is crucial for enhancing NOx removal by modified fly ash.
• Surface properties, particularly basic groups and pore structure, play a significant role in the plasma-assisted denitration process.
• Plasma treatment of modified fly ash is an effective method for NOx abatement, primarily through chemical adsorption.