Numerical Assessment of the Effects of Oxygen-Enriched Secondary Air on Fouling-Related Combustion Conditions in a Grate Furnace
5 affiliations
- 1Tianshui Normal University , , ,
- 2Engineering Research Center of Integrated Circuit Packaging and Testing , ,
- 3Gansu Integrated Circuit Packaging and Testing Industry Research Institute , ,
- 4Gansu G&T Environmental Protection Technology Co., Ltd. , ,
- 5Inner Mongolia Electric Power Scientific Research Institute Branch , , ,
Abstract
Heat transfer surface fouling severely threatens the safe and efficient operation of municipal solid waste (MSW) grate incinerators and is closely linked to local oxygen-deficient combustion atmospheres. Oxygen-enriched secondary air has been investigated as an approach for modifying furnace combustion conditions; however, its influence on fouling-related combustion conditions remains insufficiently understood. This study adopts computational fluid dynamics (CFD) to investigate combustion behaviors under four secondary air oxygen mass fraction conditions: 0.21, 0.26, 0.31, and 0.36. The O2 and CO characteristics, temperature distribution, and near-wall gas phase features are compared. Simulation results demonstrate spatially nonuniform responses to secondary air oxygen enrichment. Increasing the inlet oxygen fraction reshapes the overall furnace oxygen field, yet near-wall monitoring points exhibit no monotonic increase in local oxygen content. The CO/CO2 and H2/H2O ratios stay at very low levels for all operating scenarios, and the temperature response is also spatially nonuniform. Since changing the secondary air O2/N2 composition simultaneously changes mixture density, mass flow rate, momentum flux, Reynolds number, and total oxygen supply, the obtained results reflect combined system responses rather than the independent effect of oxygen concentration. The present CFD model focuses on gas-phase combustion and excludes detailed particle transport, ash transformation, mineral phase evolution, and deposition mechanisms; hence, it only assesses relative variations of fouling-related combustion conditions and cannot directly quantify ash deposition rates or fouling suppression performance. No single optimal secondary air oxygen enrichment level is determined among the investigated cases. This work provides a numerical basis for assessing the influence of oxygen-enriched secondary air on fouling-related combustion conditions in the grate furnaces.
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BibTeX
@article{dang2026numerical,
title = {{Numerical Assessment of the Effects of Oxygen-Enriched Secondary Air on Fouling-Related Combustion Conditions in a Grate Furnace}},
author = {Wenqiang Dang and Yurui Pu and Xiaojian Sun and Yingchun Li and Fengquan Li and Chan Liu and Dan Zhang and Pengjian Wang and Limin Zhao and Yuxiang Zhao and Xiangbing Li and Yongzhong Xing and Jianqiang Zhang and Wenbo Zhao and Hongping Yang},
journal = {ACS Omega},
year = {2026},
month = oct,
doi = {10.1021/acsomega.6c06180},
url = {https://pubs.acs.org/acsodf/article/doi/10.1021/acsomega.6c06180/5458713/Numerical-Assessment-of-the-Effects-of-Oxygen},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Numerical Assessment of the Effects of Oxygen-Enriched Secondary Air on Fouling-Related Combustion Conditions in a Grate Furnace
AU - Wenqiang Dang
AU - Yurui Pu
AU - Xiaojian Sun
AU - Yingchun Li
AU - Fengquan Li
AU - Chan Liu
AU - Dan Zhang
AU - Pengjian Wang
AU - Limin Zhao
AU - Yuxiang Zhao
AU - Xiangbing Li
AU - Yongzhong Xing
AU - Jianqiang Zhang
AU - Wenbo Zhao
AU - Hongping Yang
PY - 2026
DA - 2026/10/27
JO - ACS Omega
DO - 10.1021/acsomega.6c06180
UR - https://pubs.acs.org/acsodf/article/doi/10.1021/acsomega.6c06180/5458713/Numerical-Assessment-of-the-Effects-of-Oxygen
AB - Heat transfer surface fouling severely threatens the safe and efficient operation of municipal solid waste (MSW) grate incinerators and is closely linked to local oxygen-deficient combustion atmospheres. Oxygen-enriched secondary air has been investigated as an approach for modifying furnace combustion conditions; however, its influence on fouling-related combustion conditions remains insufficiently understood. This study adopts computational fluid dynamics (CFD) to investigate combustion behaviors under four secondary air oxygen mass fraction conditions: 0.21, 0.26, 0.31, and 0.36. The O2 and CO characteristics, temperature distribution, and near-wall gas phase features are compared. Simulation results demonstrate spatially nonuniform responses to secondary air oxygen enrichment. Increasing the inlet oxygen fraction reshapes the overall furnace oxygen field, yet near-wall monitoring points exhibit no monotonic increase in local oxygen content. The CO/CO2 and H2/H2O ratios stay at very low levels for all operating scenarios, and the temperature response is also spatially nonuniform. Since changing the secondary air O2/N2 composition simultaneously changes mixture density, mass flow rate, momentum flux, Reynolds number, and total oxygen supply, the obtained results reflect combined system responses rather than the independent effect of oxygen concentration. The present CFD model focuses on gas-phase combustion and excludes detailed particle transport, ash transformation, mineral phase evolution, and deposition mechanisms; hence, it only assesses relative variations of fouling-related combustion conditions and cannot directly quantify ash deposition rates or fouling suppression performance. No single optimal secondary air oxygen enrichment level is determined among the investigated cases. This work provides a numerical basis for assessing the influence of oxygen-enriched secondary air on fouling-related combustion conditions in the grate furnaces.
SN - 2470-1343
ER -