DBPapers
DOI: 10.5593/SGEM2014/B42/S19.070

STUDY ON POSSIBILITIES OF REDUCING NOX EMISSIONS AT CTE ROVINARI BY SPLIT INJECTION OF COMBUSTION AIR

A. Foanene, L. Anghelescu, B. Diaconu, M.Cruceru, A. Tatar
Wednesday 1 October 2014 by Libadmin2014

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-16-2 / ISSN 1314-2704, June 19-25, 2014, Book 4 ,Vol. 2, 531-538 pp

ABSTRACT
This paper studies the influence of split injection of combustion air on NOx emissions.
Reduction of NOx emissions is achieved through a series of functional and constructive measures aimed at reducing NOx in the furnace of the boiler. NOx formation depends on the amount of nitrogen in the fuel and the amount of combustion air injected into the furnace with fuel. If the nitrogen content in the fuel can not be adjusted, the secondary air introduced into the furnace can be modulated.
Secondary combustion air introduced into the furnace with fuel can be reduced to the
extent that it further provides stable ignition and combustion of the fuel. Reduction of
the amount of air introduced through the burners causes a shortage of air into the burner, leading to an increase in the content of carbon monoxide (CO) and mechanical un burn in the flue gas. This effect is compensated by placing the top of the combustion air (tertiary air) in one or more areas located between the outlets of the furnace burner output. It realizes the so-called fractional combustion air. Tertiary air to be introduced in order to ensure the best possible mixing of the combustion gases with secondary air, the excess air necessary to ensure that the output of the furnace to ensure complete combustion and prevent slagging. The excess air is small; the quantity of formed nitrogen oxide is low. Thus the paper examines several options for introducing secondary air establishing the optimal solution.

Keywords: emission, combustion air, pollution, split injection, nitrogen oxide.