Volume 106
A novel method for controlling solids circulation between two fluidized bed reactors in a looping system (Open Access)
Markku Nikku *
School of Energy Systems, LUT University, PL 20, FI-53851, Lappeenranta, Finland
10.1016/j.partic.2025.08.024
Volume 106,
Received 23 June 2025, Revised 8 August 2025, Accepted 29 August 2025, Available online 6 September 2025, Version of Record 11 September 2025.,
Pages 123-130
November 2025
E-mail:
mnikku@lut.fi
Highlights
• A novel concept is proposed for control of particle flows between two CFB reactors.
• Material division is handled in the downcomers instead of the loop seal.
• Directional air jets are used to control particle flow.
• CFD simulations are performed to test the concept.
• The novel concept displays potential in improving the controllability of dual reactor looping system.
Abstract
A novel concept for splitting particle flow leaving a cyclone separator between two circulating fluidized bed (CFB) reactors is investigated with computational fluid dynamics (CFD) software utilizing the multiphase particle-in-cell (MP-PIC) method. The different options for particle flow division are discussed, and the novel idea of using air jets is presented and simulated in a partial laboratory-scale CFB system to study its feasibility. Based on the simulation results, the proposed concept can be used to divide the particle stream between two reactors.
Graphical abstract
Keywords
Circulating fluidized bed; Solid inventory handling; CFD; Dual reactor system
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