Operating parameters optimization and efficient NO reduction of SNCR process in a municipal solid waste incinerator.

Area of Science:

• Environmental Engineering
• Chemical Engineering
• Combustion Science

Background:

• Selective Non-Catalytic Reduction (SNCR) is crucial for reducing nitrogen oxides (NOx) emissions from waste incineration.
• Optimizing SNCR performance is essential for meeting environmental regulations and improving air quality.

Purpose of the Study:

• To analyze the NO reduction process in SNCR systems using numerical simulations.
• To investigate the impact of droplet size, velocity, and atomization angle on NO removal efficiency and ammonia slip.

Main Methods:

• Numerical simulation of the SNCR process in a waste incinerator.
• Parametric study varying droplet size (120-200 μm), velocity (34-50 m/s), and atomization angle (30°-50°).

Main Results:

• All three parameters significantly influence NO removal efficiency and ammonia slip.
• A maximum NO removal efficiency of 52.7% was achieved with 5.69 ppm ammonia slip.
• Optimal conditions: 180 μm droplet size, 42 m/s velocity, and 35° atomization angle.
• Droplet size had the most substantial impact on NO removal efficiency.

Conclusions:

• SNCR system performance can be optimized by adjusting droplet size, velocity, and atomization angle.
• Prioritizing droplet size optimization is recommended for enhancing NO removal efficiency in waste incinerator SNCR systems.