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A kinetic evaluation and optimization study on NOx reduction by reburning under pressurized oxy-combustion
Zia Ur Rahman1, Jiaye Zhang1, Lan Zhang2
1MOE Key Laboratory of Thermo-Fluid Science and Engineering, Xi'an Jiaotong University, Xi'an, China.
Journal of Environmental Management
|April 26, 2021
Summary
Pressurized oxy-combustion (POC) systems can reduce nitrogen oxides (NOx) more effectively using reburning technology at elevated pressures. Optimizing reburning fuel ratios and pressure enhances NOx reduction efficiency in POC applications.
Area of Science:
- Combustion Engineering
- Environmental Science
- Chemical Engineering
Background:
- Pressurized oxy-combustion (POC) offers enhanced efficiency for carbon capture, utilization, and storage (CCUS) over atmospheric systems.
- Nitrogen oxides (NOx) are significant pollutants in POC, necessitating efficient removal strategies.
- Reburning is a cost-effective NOx reduction technology, but its application in pressurized oxy-combustion requires further investigation.
Purpose of the Study:
- To kinetically evaluate and optimize NOx reduction via reburning under pressurized oxy-combustion conditions.
- To identify optimal parameters for maximizing NOx removal efficiency in POC systems.
- To provide guidance for designing and implementing pressurized reburning processes in POC.
Main Methods:
- Validated a suitable kinetic model by comparing simulation results with experimental data at various pressures.
- Investigated the influence of parameters including oxygen environment, reburning fuel, residence time, H2O concentration, CH4/NO ratio, and equivalence ratio.
- Studied the effect of pressure on NOx reduction, HCN formation, and N2 generation.
Main Results:
- NOx reduction efficiency is significantly higher in an oxy environment compared to air and improves considerably up to 10 atm pressure.
- Optimal conditions for maximum NOx reduction were found at an equivalence ratio of 1.5 and a pressure of 10 atm.
- Increased pressure (1-10 atm) reduced HCN formation and enhanced N2 generation, with optimal CH4/NO ratio around 2.
Conclusions:
- Pressurized reburning is a highly effective method for NOx reduction in POC systems, especially at pressures up to 10 atm.
- Optimizing reburning parameters such as fuel ratio, pressure, and equivalence ratio is crucial for efficient NOx removal.
- This study provides critical insights for the design and optimization of POC systems with integrated reburning for environmental compliance.
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