Influence of dioxin reduction on chemical composition of sintering exhaust gas with adding urea

With the addition of urea as an inhibitor, four groups of reducing dioxin emission experiments in sintering pot were conducted. The results show that, adding 0.05%, 0.1% and 0.5% (mass fraction) urea, the emission concentrations of dioxin are 0.287, 0.258 and 0.217 ng-TEQ/m 3 , respectively. The dio...

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Bibliographic Details
Published in:Journal of Central South University 2012-05, Vol.19 (5), p.1359-1363
Main Authors: Long, Hong-ming, Li, Jia-xin, Wang, Ping
Format: Article
Language:English
Subjects:
Engineering
Metallic Materials
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Summary:With the addition of urea as an inhibitor, four groups of reducing dioxin emission experiments in sintering pot were conducted. The results show that, adding 0.05%, 0.1% and 0.5% (mass fraction) urea, the emission concentrations of dioxin are 0.287, 0.258 and 0.217 ng-TEQ/m 3 , respectively. The dioxin emission rates drop substantially compared to 0.777 ng-TEQ/m 3 free of urea. With an increase of the urea content, the concentration of SO 2 emission reduces sharply. (NH 4 ) 2 SO 4 , formed by the reaction of SO 2 and NH 3 , goes into the dust and part of NH3 is released before reaction with the emission of exhaust gas. The NO x emission presents an increasing trend because the reaction of NH 3 and O 2 at high temperature produces NO x . Based on the consideration of factors such as the effect of reducing dioxin emission, and the chemical composition of exhaust gas, 0.05% is the optimum adding content of urea.
ISSN:2095-2899
2227-5223
DOI:10.1007/s11771-012-1150-y