NOx emission of pressurized oxy-biomass combustion: Experimental and modeling study in a pressurized entrained flow reactor
- Release Time:2025-10-16
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2025-10-16Title of Paper:
NOx emission of pressurized oxy-biomass combustion: Experimental and modeling study in a pressurized entrained flow reactorJournal:
APPLIED THERMAL ENGINEERINGSummary:
Pressurized oxy-biomass combustion (POBC) is a technology with negative carbon emissions, supporting carbon neutrality and peaking targets. However, it also emits significant amounts of nitrogen oxides (NOx), an acidic gas that can corrode CO2 transportation pipelines and threaten geo-sequestration. Therefore, it is important to study the NOx emission in pressurized oxy-biomass combustion. In this study, a 15 kW pressurized entrained flow reactor was employed to study NOx emission in POBC. The experimental results have shown that as the pressure increases, NO formation ratio in biomass significantly decreases. When the pressure increases to 0.5 MPa, NO formation ratio of wood (WD) and the wheat straw (WS) decrease by 33.89 % and 23.81 %, respectively. NO formation ratio is dramatically increased with the oxygen concentration. Computational fluid dynamics (CFD) was used to accurately simulate NOx emissions in POBC. The simulation results indicate that compared to 0.1 MPa, the temperatures of WD and WS decreased by 33.69 K and 36.17 K at 0.5 MPa. CO mass fraction generated of WS decreases by 66.7 %, 60.5 %, 58.6 %, 48.3 %, and 40.2 % compared to that of WD from 0.1 MPa to 0.5 MPa. In addition, considering the effect of char on NO reduction, NO concentration of WD and WS dropped by 25.8 % and 17.9 % from 0.1 MPa to 0.5 MPa. The simulation results suggest that the inhibition of biomass volatilization and the promotion of NO reduction by char are the main reasons for NO decrease at elevated pressure. This study is helpful for understanding and predicting NOx emissions in POBC.Co-author:
Li Xiangdong, Dai Gaofeng, Wang Guan, Luo Yong, Lin Hui, Wang Peng, Zhang Yili, Zhang Jiaye, Tan Houzhang, Wang XuebinVolume:
262Translation or Not:
NoDate of Publication:
2025-03-01