Issue 40, 2019
From the journal:

RSC Advances

Mechanistic study on NO reduction by sludge reburning in a pilot scale cement precalciner with different CO2 concentrations

Xiang Xiao, ORCID logo ab   Ping Fang,*ab   Jian-Hang Huang,ab   Zi-Jun Tang,ab   Xiong-Bo Chen,ab   Hai-Wen Wu,ab   Chao-Ping Cenab  and  Zhi-Xiong Tangab  

* Corresponding authors

a South China Institute of Environmental Science, Ministry of Ecological Environment of P. R. China, Guangzhou 510655, Guangdong, China
E-mail: fangping@scies.org

b The Key Laboratory of Water and Air Pollution Control of Guangdong Province, Guangzhou 510655, Guangdong, China

Abstract

An experimental study on the effects of CO2 concentration on the release of reducing gases and the NO reduction efficiency by sludge reburning was carried out in a pilot scale cement precalciner. The results indicate that sludge reburning shows an ideal NO reduction activity. The best NO reduction efficiency of 54% is reached when the CO2 concentration is 25 vol%. Characteristic analysis of the sludge shows that the main types of reducing gases generated by sludge reburning are HCN, NH3, CO and CH4. Among them, CO2 concentration plays a crucial role in the release of HCN, CO and CH4. The mechanistic study indicates that NO reduction is dominated by homogeneous reduction during the sludge reburning process, in particular the reducing gases of CO and NH3 have significant influences on the NO reduction. Meanwhile, the effect of CO2 concentration on NO reduction is mainly due to the difference in CO release. The results of the present study not only provide insight into the mechanism of NO reduction by sludge reburning, but could also contribute to the development of NOX removal technology in the cement industry.

Graphical abstract: Mechanistic study on NO reduction by sludge reburning in a pilot scale cement precalciner with different CO2 concentrations

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Article information

DOI
https://doi.org/10.1039/C9RA04065J
Article type
Paper
Submitted
29 May 2019
Accepted
18 Jul 2019
First published
24 Jul 2019
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2019,9, 22863-22874

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Mechanistic study on NO reduction by sludge reburning in a pilot scale cement precalciner with different CO2 concentrations

X. Xiao, P. Fang, J. Huang, Z. Tang, X. Chen, H. Wu, C. Cen and Z. Tang, RSC Adv., 2019, 9, 22863 DOI: 10.1039/C9RA04065J

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