Work

An in-depth numerical simulation analysis of the hydrodynamic characteristics of internally-reinforced spouted beds

Year: 2025

Type: article

Abstract: Due to the lack of gas-solid radial mixing in conventional spouted bed (CSB), particles are prone to accumulation and the formation of flow dead zones. To address the limitations of CSBs, this study, for the first time, the combination optimization of the two strengthening internal components of multi-jets and draft tube was carried out, and two new types of internal strengthening structural spouted beds were proposed: the Integral Multi-jets Draft-tube Spout-fluidized Bed (IMDSFB), and the Integral Multi-jets Open-hole Draft-tube Spout-fluidized Bed (IMODSFB). At the same time, the hydrodynamic characteristics of IMDSFB and IMODSFB are studied by numerical simulation for the first time and compared with the draft tube spouted bed (DTSB) and CSB. Results indicate that compared to CSB, the spouting heights of the DTSB, IMDSFB, and IMODSFB were enhanced by 2.92%, 14.75%, and 7.94%, respectively, and the dead zone of the DTSB, IMDSFB, and IMODSFB decreased by 14%, 1%, and 5%, respectively. Compared to the CSB and DTSB, the addition of novel internal components notably improved the radial velocities of both gas and particles, as well as the gas-solid slip velocity, while reducing flow dead zones within the bed. Furthermore, the gas turbulence kinetic energy in the novel spout-fluidized beds was higher, with increased fluctuations of gas velocity in the spouting region. The granular temperature in the IMDSFB and IMODSFB was higher than in the CSB and DTSB, indicating enhanced particle fluctuations within the bed. These improvements contribute to more efficient gas-solid phase interactions, thereby enhancing the overall performance of the spouted bed.

Source: Particuology

DOI: 10.1016/j.partic.2025.03.003

Authors: Qin Bai, Feng Wu, Junhao Hao, Xiaolong Li, Zhian Deng

Institutions: Northwest University, Quanzhou Vocational and Technical University

Language: English

Topic: Granular flow and fluidized beds

Subfield: Computational Mechanics

Field: Engineering

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $3,090

Funder: National Natural Science Foundation of China