Gas-solid Flow Behaviors in a Pressurized Multi-stage Circulating Fluidized Bed with Geldart Group B Particles

Nie，Wei1; Feng，Rongtao2; Li，Junguo3; Hao，Zhenhua1; Zhan，Haijuan4; Cheng，Zhonghu1; Fang，Yitian1

2019

10.1515/ijcre-2019-0087

International Journal of Chemical Reactor Engineering   影响因子和分区

15426580

1542-6580

A comprehensive study of gas-solids flow behaviors was conducted in a novel multi-stage circulating fluidized bed (MCFB). Experiments were carried out in a cold model apparatus (a jetting fluidized bed, JFB, of 0.3 m diameter and 1.95 m tall, a riser of 0.15 m diameter and 12 m tall) at different elevated pressure, solids circulation rates and gas velocities. Geldart group B polystyrene particles of 400 μm in diameter and 1020 kg/m in density were used as bed materials. The characteristic of L-valve, axial and radial distributions of solids holdup were systematically tested at elevated pressures by pressure transducers with the frequency of 100 Hz and model PC6M of the optical fiber probes. Operating the L-valve at elevated pressure needs less cross-section average gas velocity compared to that at atmospheric pressure. Experimental results showed that under elevated pressure and high solids flow rate, the MCFB could more easily couple JFB with a riser, where the solids that entered could form three-level step-by-step supplement entrainment and multi-flow regimes formed. Besides, increasing operating pressure led to a higher the apparent solids holdup and local solids holdup. The local solids profiles behaved less uniform distribution at elevated pressure due to decreasing the gas velocity.

gas-solids flow behavior multi-stage circulating fluidized bed gasifier (MCFB) pressurized radial distribution solids holdup

SCI ; EI

英语

通讯

National Natural Science Foundation of China[21606250] ; [2017-K02]

Engineering

Engineering, Chemical

WOS:000503852700007

De Gruyter

20194407615009

Atmospheric pressure ; Fluidized bed process ; Gases ; Optical fibers

Atmospheric Properties:443.1 ; Fiber Optics:741.1.2

2-s2.0-85074225018

Scopus

1.State Key Laboratory of Coal ConversionInstitute of Coal ChemistryChinese Academy of Sciences,Taiyuan, Shanxi,030001,China
2.Institute of Coal Chemistry CAS,Taiyuan,030001,China
3.Academy for Advanced Interdisciplinary StudiesDepartment of ChemistrySouthern University of Science and Technology,Shenzhen, Guangdong,China
4.State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical EngineeringNingxia University,Yinchuan,750021,China

Nie，Wei,Feng，Rongtao,Li，Junguo,et al. Gas-solid Flow Behaviors in a Pressurized Multi-stage Circulating Fluidized Bed with Geldart Group B Particles[J]. International Journal of Chemical Reactor Engineering,2019,17(12).

Nie，Wei.,Feng，Rongtao.,Li，Junguo.,Hao，Zhenhua.,Zhan，Haijuan.,...&Fang，Yitian.(2019).Gas-solid Flow Behaviors in a Pressurized Multi-stage Circulating Fluidized Bed with Geldart Group B Particles.International Journal of Chemical Reactor Engineering,17(12).

Nie，Wei,et al."Gas-solid Flow Behaviors in a Pressurized Multi-stage Circulating Fluidized Bed with Geldart Group B Particles".International Journal of Chemical Reactor Engineering 17.12(2019).