Bed inventory balance and stability of dual circulating fluidized bed systems--颗粒学报PARTICUOLOGY

Wei, Y., Cheng, L., Pallarès, D., & Leckner, B. (2024). Bed inventory balance and stability of dual circulating fluidized bed systems. Particuology, 84, 98-106. https://doi.org/10.1016/j.partic.2023.03.006

Bed inventory balance and stability of dual circulating fluidized bed systems

Yangjun Wei ^a, Leming Cheng ^a *, David Pallarès ^b, Bo Leckner ^b

a Institute for Thermal Power Engineering, State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou, 310027, China
b Department of Space, Earth and Environment, Chalmers University of Technology, S-41296, Göteborg, Sweden

10.1016/j.partic.2023.03.006

Volume 84, January 2024, Pages 98-106

Received 3 January 2023, Revised 5 March 2023, Accepted 6 March 2023, Available online 24 March 2023, Version of Record 3 April 2023.

E-mail: lemingc@zju.edu.cn

Highlights

• Mechanism of bed inventory balance, stability and mass transport between CFBs are investigated.

• A stable-unbalanced state is observed in both experiments and model simulation.

• Control strategies for DCFB systems are proposed and discussed.

Abstract

Experiments and modelling are conducted for general understanding on the imbalance phenomenon and for discussion on the strategies to improve the bed inventory balance and stability of a dual circulating fluidized bed (DCFB) system. The experiments are carried out in a 15.5 m high pilot-scale DCFB cold test system. A fluid-dynamic DCFB model is developed based on a 1.5-dimensional semi-empirical model of an industrial CFB boiler, validated by experimental data. The effects of control methods and operation conditions on the bed inventory balance and on the stability of the pilot- and large-scale DCFB systems are discussed. A "stable-unbalanced" state, where the system reaches a steady state, consisting of unbalanced bed inventories, is observed in both experiments and model simulation. To maintain a balanced state and similar bed inventory in the DCFB systems with similar cross-sectional areas, it is recommended to keep similar total pressure drops or gas velocities in both reactors.

Graphical abstract

Keywords

Bed inventory balance; Stability; Dual circulating fluidized bed (DCFB); Experiment; Modelling

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