Thermal State Simulation and Parameter Optimization of Circulating Fluidized Bed Boiler

Xu, Jin; Zhou, Kaixuan; Li, Fengchao; Zhou, Zongyan; Wang, Yuelei; Huang, Wenbin

doi:10.3390/pr13092776

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Open AccessArticle

Thermal State Simulation and Parameter Optimization of Circulating Fluidized Bed Boiler

by

Jin Xu

¹,

Kaixuan Zhou

¹,

Fengchao Li

¹,

Zongyan Zhou

^1,*,

Yuelei Wang

²

and

Wenbin Huang

³

¹

Jiangxi Provincial Key Laboratory of Particle Technology, Jiangxi University of Science and Technology, Nanchang 330013, China

²

Key Laboratory of Energy Thermal Conversion and Control of the Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China

³

Guizhou Tianfu Chemical Co., Ltd., Fuquan 550501, China

^*

Author to whom correspondence should be addressed.

Processes 2025, 13(9), 2776; https://doi.org/10.3390/pr13092776

Submission received: 30 July 2025 / Revised: 23 August 2025 / Accepted: 25 August 2025 / Published: 29 August 2025

(This article belongs to the Section Chemical Processes and Systems)

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Abstract

In order to solve the problem of low thermal efficiency of a 130 t/h industrial circulating fluidized bed boiler, a computational particle fluid dynamic approach was used in this work to study two-phase gas–solid flow, heat transfer, and combustion. The factors influencing coal particle size distributions, air distribution strategies, and operational loads are addressed. The results showed that particle distribution exhibits “core–annulus” flow with a dense-phase bottom region and dilute-phase upper zone. A higher primary air ratio (0.8–1.5) enhances axial gas velocity and bed temperature but reduces secondary air zone (2.5–5.8 m) temperature. A higher primary air ratio also decreases outlet O₂ mole fraction and increases fly ash carbon content, with optimal thermal efficiency at a ratio of 1.0. In addition, as the coal PSD decreases and the load increases, the overall temperature of the furnace increases and the outlet O₂ mole fraction decreases.

Keywords: circulating fluidized bed boiler; computational particle fluid dynamics; gas–solid flow characteristics; combustion characteristics; thermal efficiency

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MDPI and ACS Style

Xu, J.; Zhou, K.; Li, F.; Zhou, Z.; Wang, Y.; Huang, W. Thermal State Simulation and Parameter Optimization of Circulating Fluidized Bed Boiler. Processes 2025, 13, 2776. https://doi.org/10.3390/pr13092776

AMA Style

Xu J, Zhou K, Li F, Zhou Z, Wang Y, Huang W. Thermal State Simulation and Parameter Optimization of Circulating Fluidized Bed Boiler. Processes. 2025; 13(9):2776. https://doi.org/10.3390/pr13092776

Chicago/Turabian Style

Xu, Jin, Kaixuan Zhou, Fengchao Li, Zongyan Zhou, Yuelei Wang, and Wenbin Huang. 2025. "Thermal State Simulation and Parameter Optimization of Circulating Fluidized Bed Boiler" Processes 13, no. 9: 2776. https://doi.org/10.3390/pr13092776

APA Style

Xu, J., Zhou, K., Li, F., Zhou, Z., Wang, Y., & Huang, W. (2025). Thermal State Simulation and Parameter Optimization of Circulating Fluidized Bed Boiler. Processes, 13(9), 2776. https://doi.org/10.3390/pr13092776

Note that from the first issue of 2016, this journal uses article numbers instead of page numbers. See further details here.

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Thermal State Simulation and Parameter Optimization of Circulating Fluidized Bed Boiler

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