NOx and ultrafine particle emission characteristics in a new steel slag modification device

Metalurgija

Dai, W. B.¹  Qi, L. Y.²  Zhang, L. L.³  Guo, J. X.⁴  Cang, D. Q.⁴ 

[1] Beijing Building Materials Academy of Sciences Research (BBMA), State Key Laboratory of Solid Waste Reuse for Building Materials (SKL-SWR), China;Hebei University of Engineering, College of Energy and Environmental Engineering, China;University of Science and Technology Beijing, School of Energy and Environment Engineering, China;University of Science and Technology Beijing, School of Metallurgical and Ecological Engineering, China

关键词: steel slag modification;    NOx emission;    particulate matter (PM);    coal swirl combustion;   

DOI  :  

学科分类：金属与冶金

来源: Hrvatsko Metalursko Drustvo

【 摘 要 】

Two density-separated Chinese coals and steel slag were prepared and then combusted in a modification furnace with different excess air ratio. Non-staged and Fuel-staged combustion experiments were compared under different pulverized coal mixing ratios. Thus, in the fuel-staged combustion experiments, the concentration of NOx in the flue gas was found to greatly decrease under a bitumite: anthracite mixing ratio of 1:1 and an air excess coefficient of 1,2 under the fuel-staged ratio is 15:85. The flue gas temperature was as high as 1 615 °C, while the NOx concentration in the flue gas was as low as 320 mg/m3. Compared with the other types of burners, the experimental combustion device designed herein efficiently reduced the NOx emissions ca. 80%. Fuel-staged combustion has a significant effect on reducing particulate matter (PM) emissions, and a suitable coal ratio was also beneficial for reducing particulate matter emissions.

【 授权许可】

CC BY