Combustion Kinetics and Reaction Mechanisms of Rice Straw During Oxy-Fuel Combustion
Dandan Li1,2, Qing Wang1, Yufeng Pei2
1Engineering Research Centre of Oil Shale Comprehensive Utilization, Ministry of Education, Northeast Electric Power University, Jilin 132012, China.
Materials (Basel, Switzerland)
|April 14, 2026
Summary
Oxy-fuel combustion of rice straw significantly reduces pollutant emissions and enhances combustion efficiency. This technology lowers ignition and burnout temperatures, decreases activation energy, and minimizes NOx and SO2 release.
Area of Science:
- * Combustion Science
- * Environmental Engineering
- * Chemical Kinetics
Background:
- * Oxy-fuel combustion utilizes high O2 concentrations and recycled flue gas for near-zero emissions.
- * It enables efficient combustion and effective CO2 capture, crucial for climate change mitigation.
- * Rice straw combustion is investigated as a sustainable biomass energy source.
Purpose of the Study:
- * To evaluate the combustion behavior and pollutant emissions of rice straw under various oxy-fuel conditions.
- * To analyze the reaction kinetics and mechanisms of rice straw combustion.
- * To determine the optimal conditions for clean and efficient rice straw utilization.
Main Methods:
- * Thermogravimetric analysis (TG-MS) and differential scanning calorimetry (DSC) were employed.
- * Experiments were conducted at heating rates of 10, 20, and 30 °C/min.
- * Combustion was performed under air and various oxy-fuel atmospheres (30-70% O2).
Main Results:
- * Oxy-fuel combustion reduced ignition and burnout temperatures and shortened combustion duration.
- * NOx emissions decreased by over 75%, with suppressed SO2 and COS release.
- * Activation energy was reduced by approximately 47%, indicating lower reaction barriers.
- * Combustion mechanisms shifted towards diffusion-controlled processes or random nucleation growth.
Conclusions:
- * Oxy-fuel combustion significantly improves rice straw combustion efficiency and reduces harmful emissions.
- * Optimized oxy-fuel conditions and heating rates offer a pathway for clean biomass utilization.
- * The study provides theoretical support for the practical application of oxy-fuel combustion technology.
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