Effect of bed density on the segregation behavior of fine coal particles (<6 mm) in a gas-solid separation fluidized bed

被引：8

作者：

Wang, Song ^{[1
,2
]}

Fu, Yanhong ^{[1
,2
]}

Zhao, Yuemin ^{[1
,2
]}

Dong, Liang ^{[1
,2
]}

Chen, Zengqiang ^{[1
,2
]}

机构：

[1] China Univ Min & Technol, Key Lab Coal Proc & Efficient Utilizat, Minist Educ, Xuzhou 221116, Jiangsu, Peoples R China

[2] China Univ Min & Technol, Sch Chem Engn & Technol, Xuzhou 221116, Jiangsu, Peoples R China

来源：

POWDER TECHNOLOGY | 2022年 / 395卷

基金：

中国国家自然科学基金;

关键词：

Fine coal; Gas-solid separation fluidized bed; Mixing and segregation; Bubble; Misplaced material; BINARY-MIXTURES; FLOW; MODEL; VELOCITY;

D O I：

10.1016/j.powtec.2021.10.037

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

In this paper, the segregation behavior of fine particles with different densities in a gas-solid separation fluidized bed with Geldart B particles acting as the fluidized medium was studied. The variation characteristics of the bed density and bubble behavior under different operating gas velocities were studied by analyzing the pressure drop signal occurring within in the bed. The results showed that there was an evident backmixing phenomenon of feed composed of single and mixed particles in a gas-solid fluidized bed, and the total misplaced material rate reached 45.8%, 46.12% and 44.48%, indicating that the feed could not achieve a good segregation effect according to the bed density. The mixing effect of feed particles first increased and then decreased with increasing operating gas velocities. However, it is worth noting that the gas-solid fluidized bed system still had a good segregation effect for feed particles with densities higher than the bed density. (c) 2021 Elsevier B.V. All rights reserved.

引用

页码：872 / 882

页数：11

共 41 条

[1] An extended version of the countercurrent backmixing model suitable for solid mixing in two-dimensional fluidised beds [J].

Abanades, JC ;

Grasa, G .

POWDER TECHNOLOGY, 2001, 120 (1-2) :113-119

[2] Improving Fluidization Hydrodynamics of Group C Particles by Mixing with Group B Particles [J].

Al-Ghurabi, Ebrahim H. ;

Ajbar, Abdelhamid ;

Asif, Mohammad .

APPLIED SCIENCES-BASEL, 2018, 8 (09)

[3] GAS ABSORPTION BY LARGE RISING BUBBLES [J].

BAIRD, MHI ;

DAVIDSON, JF .

CHEMICAL ENGINEERING SCIENCE, 1962, 17 (02) :87-93

[4] A critical review of the complex pressure fluctuation phenomenon in gas-solids fluidized beds [J].

Bi, Hsiaotao T. .

CHEMICAL ENGINEERING SCIENCE, 2007, 62 (13) :3473-3493

[5] A state-of-the-art review of gas-solid turbulent fluidization [J].

Bi, HT ;

Ellis, N ;

Abba, IA ;

Grace, JR .

CHEMICAL ENGINEERING SCIENCE, 2000, 55 (21) :4789-4825

[6] FLUIDIZED BINARY-MIXTURES IN WHICH THE DENSER COMPONENT MAY BE FLOTSAM [J].

CHIBA, S ;

NIENOW, AW ;

CHIBA, T ;

KOBAYASHI, H .

POWDER TECHNOLOGY, 1980, 26 (01) :1-10

[7] MINIMUM FLUIDIZATION VELOCITY, BED EXPANSION AND PRESSURE-DROP PROFILE OF BINARY PARTICLE MIXTURES [J].

CHIBA, S ;

CHIBA, T ;

NIENOW, AW ;

KOBAYASHI, H .

POWDER TECHNOLOGY, 1979, 22 (02) :255-269

[8] GAS AND SOLIDS MOTION AROUND DEFORMED AND INTERACTING BUBBLES IN FLUIDIZED-BEDS [J].

CLIFT, R ;

CHEUNG, L ;

GRACE, JR ;

DO, TH .

JOURNAL OF FLUID MECHANICS, 1972, 51 (JAN11) :187-&

[9] BEHAVIOUR OF A CONTINUOUSLY BUBBLING FLUIDISED BED [J].

DAVIDSON, JF ;

HARRISON, D .

CHEMICAL ENGINEERING SCIENCE, 1966, 21 (09) :731-&

[10]

Formisani B., 2014, POWDER PART, V21, P66

← 1 2 3 4 5 →