Effects of heterogeneous flow on carbon conversion in gas-solid circulating fluidized beds

被引：8

作者：

Nikku, Markku ^{[1
]}

Bordbar, Hadi ^{[2
]}

Myohanen, Kari ^{[1
]}

Hyppanen, Timo ^{[1
]}

机构：

[1] Lappeenranta Univ Technol, Sch Energy Syst, Lab Modelling Energy Syst, Lappeenranta, Finland

[2] Aalto Univ, Dept Civil Engn, Lab Fire Safety Engn, Espoo, Finland

来源：

FUEL | 2020年 / 280卷

基金：

芬兰科学院;

关键词：

Fluidized bed; Combustion; Eulerian multiphase; CFD modeling; Reactivity; Mass transfer; MASS-TRANSFER; HEAT-TRANSFER; SIMULATIONS; COMBUSTION; PARTICLES; MODEL; COEFFICIENTS; DISPERSION; EQUATIONS; FURNACE;

D O I：

10.1016/j.fuel.2020.118623

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

Gas-solid fluidized beds have heterogeneous flow structures, which affect the reactions due to uneven distribution and limited mixing of reactants. Some model approaches neglect these heterogeneous structures and use a homogeneous assumption instead. This work demonstrates the effects of neglecting this heterogeneity. Eulerian multiphase modeling is utilized to model fuel conversion in a fluidized bed riser. The effects of the chemical reactivity of the fuel, the amount of fuel in the reactor and the fluidization regime are investigated. The model data are time- and space-averaged into 1D results and compared with a 1D modelling which assumes homogeneous distributions in radial direction. Based on this study, the negligence of the heterogeneous flow structures leads to significantly higher local and overall reaction rates and conversion in the system.

引用

页数：13

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