NDLI: NO$_{ x }$ Reduction in the Iron Ore Sintering Process with Flue Gas Recirculation

Content Provider	Springer Nature Link
Author	Yu, Zhiyuan Fan, Xiaohui Gan, Min Chen, Xuling Lv, Wei
Copyright Year	2017
Abstract	Flue gas recirculation (FGR) has been implemented for exhaust gas emissions reduction in iron ore sintering. However, the mechanism of NO$_{ x }$ reduction through FGR is still unclear. In this paper, the laboratory pot-grate sintering test showed a 30% reduction in gas flow and 15.51% reduction in NO$_{ x }$ emissions achieved with a 30% FGR ratio, and the sinter indexes almost matched those of the conventional process. In the sinter zone, NO-CO catalytic reduction occurs in the range of 500–900°C. When the sinter temperature is 700°C, the highest nitrogen reduction ratio (NRR) achieved is 8%; however, the NO$_{ x }$ reduction is inhibited as the post-combustion of CO starts when the temperature increases beyond 700°C. NO$_{ x }$ in the flue gas is mainly a product of the fuel combustion in the combustion zone, as the nitrogen conversion rate reaches 50–60%, because the N-containing intermediates exist during the fuel combustion. The existence of NO in the FGR gas inhibits the NO$_{ x }$ generation from the fuel combustion, and the NO elimination—through the NO-carbon reaction—is significant in the combustion zone. The NRR in the combustion zone reaches a range of 18–20%.
Starting Page	1570
Ending Page	1574
Page Count	5
File Format	PDF
ISSN	10474838
Journal	JOM
Volume Number	69
Issue Number	9
e-ISSN	15431851
Language	English
Publisher	Springer US
Publisher Date	2017-02-13
Publisher Institution	The Minerals, Metals & Materials Society (TMS)
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Engineering Chemistry/Food Science Physics Environment Earth Sciences
Content Type	Text
Resource Type	Article
Subject	Engineering Materials Science

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