TY - JOUR
T1 - Exploring high-density spiral particles belt built in a vortical-type downer pyrolyzer via CFD-DEM simulation
AU - Lian, Wenhao
AU - Wang, Huping
AU - Pan, Xueer
AU - Li, Le
AU - Li, Xiangyang
AU - Zhang, Nan
AU - Wei, Xiaoyang
AU - Yang, Jingxuan
AU - Hao, Xiaogang
N1 - Publisher Copyright:
© 2025 Elsevier B.V.
PY - 2025/12/23
Y1 - 2025/12/23
N2 - The solids flow behaviors in a specially designed vortical-type downer are systematically investigated using the CFD-DEM simulation. Different from conventional cylindrical-type downer, this novel structure converts the vertical solids feeding direction into a horizontally tangential feeding. By utilizing the movement characteristics of the particles spirally moving downward along the reactor wall, it is expected to build a mesoscale spiral particles belt, in which high-density particles can be accumulated to strengthen the binary particles heat transfer efficiency. Simulation results confirm the successful formation of the spiral particles belt, with a significant increase in solids holdup (0.3–0.4). Further analysis reveals that higher solids flux, lower gas velocity, larger particles size and density are beneficial for the construction of spiral particles belt. Based on the discussion above, the advantages of high-density operation in the vortical-type downer are also discussed compared with the conventional cylindrical-type downer. These results offer a theoretical basis for the R&D and industrial application of the next-generation pyrolysis device.
AB - The solids flow behaviors in a specially designed vortical-type downer are systematically investigated using the CFD-DEM simulation. Different from conventional cylindrical-type downer, this novel structure converts the vertical solids feeding direction into a horizontally tangential feeding. By utilizing the movement characteristics of the particles spirally moving downward along the reactor wall, it is expected to build a mesoscale spiral particles belt, in which high-density particles can be accumulated to strengthen the binary particles heat transfer efficiency. Simulation results confirm the successful formation of the spiral particles belt, with a significant increase in solids holdup (0.3–0.4). Further analysis reveals that higher solids flux, lower gas velocity, larger particles size and density are beneficial for the construction of spiral particles belt. Based on the discussion above, the advantages of high-density operation in the vortical-type downer are also discussed compared with the conventional cylindrical-type downer. These results offer a theoretical basis for the R&D and industrial application of the next-generation pyrolysis device.
KW - Centrifugal densification
KW - High-density operation
KW - Mesoscale structure
KW - Spiral particles belt
KW - Vortical-type downer
UR - https://www.scopus.com/pages/publications/105009009649
U2 - 10.1016/j.seppur.2025.133978
DO - 10.1016/j.seppur.2025.133978
M3 - Article
AN - SCOPUS:105009009649
SN - 1383-5866
VL - 376
JO - Separation and Purification Technology
JF - Separation and Purification Technology
M1 - 133978
ER -