Fluidization of micro-interconnected fluidized beds for chemical looping--颗粒学报PARTICUOLOGY

Shen, T., Zhu, X., Song, T., & Shen, L. (2021). Fluidization of micro-interconnected fluidized beds for chemical looping. Particuology, 54, 136-145. https://doi.org/10.1016/j.partic.2020.08.005

Fluidization of micro-interconnected fluidized beds for chemical looping

Tianxu Shen ^a, Xiao Zhu ^a, Tao Song ^b, Laihong Shen ^a *

a Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China
b Jiangsu Provincial Key Laboratory of Materials Cycling and Pollution Control, School of Energy and Mechanical Engineering, Nanjing Normal University, Nanjing 210042, China

10.1016/j.partic.2020.08.005

Volume 54, February 2021, Pages 136-145

Received 16 May 2018, Revised 23 August 2018, Accepted 26 August 2020, Available online 24 October 2020, Version of Record 28 January 2021.

E-mail: lhshen@seu.edu.cn

Highlights

• A micro-interconnected fluidized bed was designed for evaluation of oxygen carrier.

• Flexible and stable fluidization was realized with 342.9 g bed inventory.

• A fitting formula was developed to estimate the upward solid flow in the risers.

• Internal distributors could improve the residence time and fluidization behaviors.

Abstract

The micro-interconnected fluidized bed (MIFB) was designed to improve the evaluation condition of oxygen carrier, which is difficult to perform in a lab-scale interconnected fluidized bed because of the large demand for bed inventory. The reduction of bed inventory in the MIFB was mainly achieved by the appropriate miniaturization of the reactor size, in which the wall effect and operating flexibility should be taken into consideration. With hematite serving as the oxygen carrier, stable and flexible fluidization could be realized with 342.9 g of bed inventory. Internal perforated plates were arranged in the middle of the reactor to improve gas–solid distribution, which also could restrain the slugging formation and increase the particle residence time by 28.9%. A different fluidization phenomenon was observed in this two-stage reactor in which the particle fluidization was reconstructed in the upper chamber. Throughout 48 h of cold operation, the hematite oxygen carrier attrition rate was evaluated as 0.151 wt.%/h corresponding to 660 h lifetime, where 12.5% of particle attrition was contributed by internal perforated plates. An excellent fitting performance was found between the pressure difference in the risers and the upward particle flow, but the correction factor should be adjusted according to the fluidization flow.

Graphical abstract

Keywords

Micro chemical-looping reactor; Bed inventory; Internal perforated plate; Hydrodynamics

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