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Volume 110
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Li, Y., Luo, G., Wang, S., You, L., & Wang, H. (2026). One-dimensional unsteady modeling of drying and devolatilization of coal particles under pressurized oxy-fuel conditions in fluidized beds. Particuology, 110, 109-121. https://doi.org/10.1016/j.partic.2026.01.012
One-dimensional unsteady modeling of drying and devolatilization of coal particles under pressurized oxy-fuel conditions in fluidized beds
Yanhong Li, Guosheng Luo, Shijie Wang, Lina You, Haochen Wang *
a Chongqing New Guidance Intelligent Technology Research Institute Co., Ltd, China
b Graduate Business School, UCSI University, Kuala Lumpur, Malaysia
c Chemistry and Chemical Engineering, Southeast University, Nanjing, 210096, China
d College of Chemistry, Beijing University of Chemical Technology, Beijing, 100029, China
10.1016/j.partic.2026.01.012
Volume 110, March 2026, Pages 109-121
Received 20 May 2025, Revised 22 December 2025, Accepted 6 January 2026, Available online 20 January 2026, Version of Record 29 January 2026.
E-mail: lunwenpaper888@163.com
Highlights

• Explored atmospheric effects on coal devolatilization in pressurized fluidized beds.

• Specific heat, heat transfer, density/size, and moisture influence particle drying.

• Model predicts devolatilization in pressurized oxygen combustion with <20 % error.


Abstract

This study develops a one-dimensional unsteady model to simulate the drying and devolatilization of large coal particles (4–12 mm) under pressurized oxy-fuel conditions in fluidized beds. The model reveals that devolatilization time scales quadratically with particle diameter (t ∝ dp2), confirming heat conduction as the rate-limiting step. Increased system pressure significantly shortens drying and devolatilization times by up to 18 % and 31 %, respectively, but also amplifies intra-particle temperature gradients. Under identical operating conditions, differences between O2/CO2 and O2/N2 atmospheres were marginal (<5 %). Model predictions agree with experimental measurements within 20 % deviation. The results provide operational guidance for pressurized fluidized bed combustors, emphasizing the strong influence of particle size and pressure on process efficiency and heat transfer limitations, while also highlighting their implications for energy efficiency improvement, emission reduction, and the advancement of environmentally sustainable combustion technologies.

Graphical abstract
Keywords
Gas-solid fluidized bed; Coal combustion; Impurity removal; Carbon reduction; Sustainable energy development
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