Process simulation of formation and emission of NO and N2O during coal decoupling combustion in a circulating fluidized bed combustor using Aspen Plus

被引：31

作者：

Liu, Bing ^{[1
,2
]}

Yang, Xue-min ^{[1
]}

Song, Wen-li ^{[1
]}

Lin, Wei-gang ^{[1
]}

机构：

[1] Chinese Acad Sci, State Key Lab Multiphase Complex Syst, Inst Proc Engn, Beijing 100190, Peoples R China

[2] Chinese Acad Sci, Grad Univ, Beijing 100039, Peoples R China

来源：

CHEMICAL ENGINEERING SCIENCE | 2012年 / 71卷

关键词：

Mathematical modeling; Systems engineering; Simulation; Combustion; NO and N2O emission; Aspen Plus; OPERATING PARAMETERS; REDUCTION; CARBON;

D O I：

10.1016/j.ces.2011.10.050

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

A process simulation model of coal decoupling combustion in a 30 kW circulating fluidized bed (CFB) combustor has been developed for predicting NO and N2O emissions based on the built-in modules/blocks provided by Aspen Plus software as well as the external subroutines from FORTRAN compiler. The gas-solid hydrodynamics in the decoupling CFB combustor and macro-chemical reaction kinetics of coal combustion have been included in the process simulation model of CFB coal decoupling combustion. The profiles of average bed temperature and concentrations of gas components along the CFB riser height can be successfully predicted by the developed process simulation model. The effects of excess air percentage, first stage stoichiometry, and the introduction position of secondary air on concentrations of the emitted gaseous components, especially concentrations of NO and N2O can be simulated by the developed process simulation model. The contribution ratios of all relevant combustion reactions to emissions of NO and N2O can be quantitatively predicted. A good agreement between the simulated and measured results can be obtained during CFB coal decoupling combustion process under a large variation range of the CFB operation conditions. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：375 / 391

页数：17

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