Numerical insight into heat transfer enhancement by granules inner-migration in a moving bed: A performance comparison between slanted-stick and plow-shaped agitator--颗粒学报PARTICUOLOGY

Jiang, B., Pei, H., Xia, D., & Wang, H. (2024). Numerical insight into heat transfer enhancement by granules inner-migration in a moving bed: A performance comparison between slanted-stick and plow-shaped agitator. Particuology, 89, 109-116. https://doi.org/10.1016/j.partic.2023.10.009

Numerical insight into heat transfer enhancement by granules inner-migration in a moving bed: A performance comparison between slanted-stick and plow-shaped agitator

Binfan Jiang ^{a b c}, Hao Pei ^a, Dehong Xia ^a *, Haiyang Wang^c

a School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China
b Shunde Graduate School of University of Science and Technology Beijing, Guangdong 528399, China
c Jianlong Group & USTB Joint Laboratory, Beijing 100083, China

10.1016/j.partic.2023.10.009

Volume 89, June 2024, Pages 109-116

Received 5 June 2023, Revised 16 September 2023, Accepted 10 October 2023, Available online 2 November 2023, Version of Record 6 December 2023.

E-mail: xia@me.ustb.edu.cn

Highlights

• Granule migration and heat transfer in moving bed is investigated by simulation.

• DEM coupled with CFD is adopted to analyze detailed heat transfer behavior.

• Heat transfer enhancement and the operating reliability of different agitators are compared.

• Agitator with plow-shaped surface is recommended for its better agitating reliability.

Abstract

Waste heat recovery of high-temperature granules is one of the most promising sustainable energy supply and carbon reduction ways for industry. A moving bed indirect heat exchanger (MBIHE) with inner-migration was proposed for granular heat recovery. Granule migration and the enhanced heat transfer induced by two types of agitators (i.e., agitator with slanted stick A_s and with plow-shaped surface A_p) in the MBIHE are analyzed based on DEM coupled with CFD. Owing to the effective agitation, the average heat transfer coefficient in the granule side is enhanced to ∼3 times compared to that without agitation. The heat recovery efficiency in the moving bed reached more than 70% with the agitations of either A_s or A_p. The heat efficiency of A_s is ∼7% higher than that of A_p, but with at least 60% greater rotational torque. To ensure reliable agitation, the A_p is suggested to be adopted in the MBIHE to induce granule migration.

Graphical abstract

Keywords

Waste heat recovery; High-temperature granule; Granule migration; Heat transfer enhancement; Industry energy saving

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