Effect of secondary air on NO emission in a 440 t/h circulating fluidized bed boiler based on CPFD method

被引：16

作者：

Liu, Hongpeng ^{[1
]}

Sun, Haiwen ^{[1
]}

Bi, Ye ^{[1
]}

Jia, Chunxia ^{[1
]}

Zhang, Lei ^{[2
]}

Li, Yanlong ^{[3
]}

Qin, Hong ^{[1
]}

Wang, Qing ^{[1
]}

机构：

[1] Northeast Elect Power Univ, Engn Res Ctr Oil Shale Comprehens Utilizat, Sch Energy & Power Engn, Minist Educ, Jilin 132012, Peoples R China

[2] Univ British Columbia, Dept Chem & Biol Engn, Vancouver, BC V6T1Z3, Canada

[3] Huadian Elect Power Res Inst Co Ltd, Northeast Branch, Shenyang 110000, Peoples R China

来源：

PARTICUOLOGY | 2023年 / 83卷

关键词：

Circulating fluidized bed; Low nitrogen combustion; Computational particle fluid dynamics; (CPFD); Numerical simulation; Secondary air; FUEL NITROGEN; COAL-GASIFICATION; FLOW; MODEL; COMBUSTION; SIMULATION; PARAMETERS; CONVERSION; REDUCTION; CFD;

D O I：

10.1016/j.partic.2023.02.002

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

The 440 t/h circulating fluidized bed boiler was numerically simulated by the Computational Particle Fluid Dynamics (CPFD) method. The combustion characteristics of circulating fluidized bed boiler and the effect of secondary air on NO emission were investigated. The full-scale three-dimensional model of a 440 t/h circulating fluidized bed boiler was established. The rationality of the grid was validated by the experimental data of material layer resistance. The accuracy of the simulation was validated by measuring the temperature of each measuring point in the dense phase area. The combustion conditions in the furnace under different setting modes were simulated. The effects of secondary air rates on NO formation in fluidized bed were predicted. The results show that when the secondary air rate increases to 27%, the proper secondary air rate has a positive effect on the inhibition of NO generation, and the proper strengthening of the central air supply will improve the permeability of the secondary air and make the combustion more uniform and stable. When the secondary air rate increases to 33%, excessive improvement of air classiflcation and central air distribution will affect the stability of circulating flu-idized bed operation. Therefore, air classiflcation and strengthening of central air supply can be used together to inhibit the generation of NO.(c) 2023 Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.

引用

页码：18 / 31

页数：14

共 45 条

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