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ORGANIZER;CN='8th ECIC & 9th ICSTI 2022':MAILTO:info@ecic-icsti.com
LOCATION:Room „Lloyd“
SUMMARY:NOx emission from the Hot Blast System: Formation, effects, and the possibilities for its reduction
DESCRIPTION:NOx emission from the Hot Blast System: Formation, effects, and the possibilities for its reduction
Bart de Graaff, Jan de Weerdt, Yuriy Lytvynyuk (Danieli Corus)

Keywords: Hot Blast Stoves, Hot Blast System, NOx formation, Emissions, Inter–crystalline Stress Corrosion
INTRODUCTION
The environmental footprint of the production of iron and steel is well–known by the industry and in general large improvements have been made in this field over the past decades [ref. 13]. However, in many places iron and steel companies are still a significant source of water and air pollution. With growing concerns from local societies over harmful emissions and the tightening of environmental regulations the need for mitigation remains high and important. One of the emissions that often gains attention of the ironmaking industry is the group of nitrous oxides, or NOx. 
This pollutant is formed within many of the present combustion processes, but one of its main sources and points of concern in the iron and steel industry is the Hot Blast System. Not only due its negative impact on the environment, but also because its influence on the occurrence of inter–crystalline stress corrosion. 
This article is intended to give an overview of the formation of NOx and the available methods to predict it, explaining the needs for its mitigation as well as providing certain directions to reduce its formation.

CONSEQUENCES
The reason why NOx is considered an undesired reaction product has two main reasons, first the environmental impacts. Secondly, and especially relevant for Hot Blast Systems, is the role NOx plays in the occurrence of Inter–Crystalline Stress Corrosion at the inside of the steel shell of the stoves. 

Environmental Impact
The environmental effects of NOx have been a field of investigation for decades and are well documented [ref. 4]. One of the most important negative effects of NOx is the role it plays in 
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DTSTART:20220901T100000
DTEND:20220901T102500
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