Numerical study on NOx/CO emissions in the diffusion flames of high-temperature off-gas of steelmaking converter

被引：9

作者：

Li, Sen ^{[1
]}

Wei, Xiaolin ^{[1
]}

Yu, Linxin ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Mech, Beijing 100190, Peoples R China

来源：

APPLIED ENERGY | 2011年 / 88卷 / 04期

基金：

中国国家自然科学基金;

关键词：

Off-gas of steelmaking converter; NOx; CO; Counterflow diffusion flame; LAMINAR;

D O I：

10.1016/j.apenergy.2010.10.030

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：

The combustion of high-temperature off-gas of steelmaking converter with periodical change of temperature and CO concentration always leads to CO and NOx over-standard emissions. In the paper, high-temperature off-gas combustion is simulated by adopting counterflow diffusion flame model, and some influencing factors of CO and NOx emissions are investigated by adopting a detailed chemistry GRI 3.0 mechanism. The emission index of NOx (EINOx) decreases 1.7-4.6% when air stoichiometric ratio (SR) increase from 0.6 to 1.4, and it dramatically increases with off-gas temperature at a given SR when the off-gas temperature is above 1500 K. High-concentration CO in off-gas can result in high NOx emissions, and NOx levels increase dramatically with CO concentration when off-gas temperature is above 1700 K. Both SR and off-gas temperature are important for the increase of CO burnout index (BICO) when SR is less than 1.0, but BICO increase about 1% when off-gas temperature increases from 1100 K to 1900 K at SR > 1.0. BICO increases with CO concentration in off-gas, and the influence of off-gas temperature on BICO is marginal. BICO increases with the relative humidity (RH) in air supplied, but it increases about 0.5% when RH is larger than 30%. (C) 2010 Elsevier Ltd. All rights reserved.

引用

页码：1113 / 1119

页数：7