Hydrodynamics and catalytic reaction inside a novel multi-regime riser

被引：18

作者：

Zhu, Xiaolin ^{[1
]}

Geng, Qiang ^{[1
]}

Wang, Guowei ^{[1
]}

Li, Chunyi ^{[1
]}

Yang, Chaohe ^{[1
]}

机构：

[1] China Univ Petr, State Key Lab Heavy Oil Proc, Qingdao 266580, Peoples R China

来源：

CHEMICAL ENGINEERING JOURNAL | 2014年 / 246卷

基金：

中国国家自然科学基金;

关键词：

Multi-regime; Circulating fluidized bed; Hydrodynamics; Catalytic ozone decomposition; Gas-solids contact efficiency; CIRCULATING FLUIDIZED-BED; PARTICLE-SIZE DISTRIBUTION; SOLIDS FLOW PATTERNS; MASS-TRANSFER MODEL; OZONE DECOMPOSITION; TURBULENT FLUIDIZATION; PERFORMANCE; SIMULATION; REACTORS;

D O I：

10.1016/j.cej.2014.02.074

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Hydrodynamics and performance of a novel multi-regime riser reactor, combined with a dense-phase turbulent bottom region and a dilute upper region, were studied in this work. Systematic research into gas-solids flow patterns indicated that, increased solids concentration, improved solids distribution and intensified gas-solids fluctuation over the conventional riser were achieved in the diameter-enlarged bottom section of this novel riser. Subsequently, catalytic ozone decomposition has been introduced to investigate the reactor performance. Compared with the conventional riser, where the reaction mainly occurred near the wall, notable ozone decomposition in the column center was representative for the multi-regime riser, consequently leading to a more uniform radial ozone concentration profile. Although ozone conversion was enhanced in the multi-regime riser for increased solids concentration and prolonged gas residence time, axial ozone concentration profiles in both riser reactors still deviated obviously from the plug-flow behavior. However, resulting from the improved gas-solids flow structure and strengthened inter-phase mass transfer behavior over the conventional riser, higher gas-solids contact efficiency was obtained for this novel riser. (c) 2014 Elsevier B.V. All rights reserved.

引用

页码：150 / 159

页数：10

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