Original scientific paper

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

J. X. Guo ; University of Science and Technology Beijing, School of Metallurgical and Ecological Engineering, China
L. L. Zhang ; University of Science and Technology Beijing, School of Energy and Environment Engineering, China
W. B. Dai ; Beijing Building Materials Academy of Sciences Research (BBMA), State Key Laboratory of Solid Waste Reuse for Building Materials (SKL-SWR), China
L. Y. Qi ; Hebei University of Engineering, College of Energy and Environmental Engineering, China
D. Q. Cang ; University of Science and Technology Beijing, School of Metallurgical and Ecological Engineering, China

Abstract

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.

Keywords

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

Hrčak ID:

189361

URI

https://hrcak.srce.hr/189361

Publication date:

1.1.2018.

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