Effects of pressure on flow characteristics in a pressurized circulating fluidized bed--颗粒学报PARTICUOLOGY

Dong, P., Tu, Q., Wang, H., & Zhu, Z. (2021). Effects of pressure on flow characteristics in a pressurized circulating fluidized bed. Particuology, 59, 16-23. https://doi.org/10.1016/j.partic.2020.07.004

Effects of pressure on flow characteristics in a pressurized circulating fluidized bed

Pengfei Dong ^a, Qiuya Tu ^a *, Haigang Wang ^{a b}, Zhiping Zhu ^{a b}

a Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 10090, China
b University of Chinese Academy of Sciences, Beijing 100049, China

10.1016/j.partic.2020.07.004

Volume 59, December 2021, Pages 16-23

Received 3 February 2020, Revised 27 May 2020, Accepted 8 July 2020, Available online 8 August 2020, Version of Record 13 October 2021.

E-mail: tuqiuya@iet.cn

Highlights

• Elevated pressure improves the axial and radial particle uniformity.

• Experimental axial pressure drops decrease as the operating pressure increases.

• Wen-Yu-Ergun drag model must be improved for simulation of high-pressure CFBs.

Abstract

The effects of operating pressure on the gas–solid flow characteristics in a pressurized circulating fluidized bed (CFB) gasification system were studied by experiment and simulation. Elevated operating pressure was found to increase the particle uniformity in the axial and radial directions. Experiments and simulations both showed that as the operating pressure increased, the pressure drops along the riser height decreased. The experimental pressure drops at the same locations decreased when the operating pressure increased, but the opposite trend was observed in the simulation results. A proper drag model must be developed for the accurate simulation of pressurized CFB operation, and the accuracy of electrical capacitance tomography (ECT) measurement and cross-correlation analysis should be improved for better prediction of the particle circulation flux.

Graphical abstract

Keywords

Pressurized circulating fluidized bed; Pressure effect; Drag model; Uniformity

文章导读