Nitrogen oxides emission (NOx) in industrial combustion


Nitrogen oxides (NO and NO2 – NOX ) are known air pollutants (pollutant primary and one responsible for the acidity of rain, depletion of the ozone layer and formation of photochemical oxidants – smog) and emissions from industrial combustion processes (boilers, furnaces, incinerators) regulated in Brazil by national and state laws. The formation of NOX in combustion is due to reactions involving primarily oxygen and nitrogen from air (formation of “thermal NOX”) or oxygen and fuel nitrogen (formation of “fuel NOX”) and can be reduced by acting directly on the process from operating changes (excess air, power input, flue gas recirculation) until substantial modifications, such as staging in supplying air or fuel. The latter, being very effective and uncertain application for fuel oils used in Brazil (high viscosity and nitrogen content), were the subject in the past of an extensive experimental research conducted by the Thermal Engineering Laboratory of Institute for Technological Research of the State of São Paulo. Reburning systems and low NOX burners were studied. The knowledge gained in this work and that has been accumulated over time has been used to aid the industry in reducing their NOX emissions. The Thermal Engineering Laboratory team has gone regularly to industries with its mobile unit for survey of NOX emissions and other variables of the combustion process to then recommend and eventually implement measures to take to reduce emissions.

VERGNHANINNI FILHO, Renato. Emissão de óxidos de nitrogênio (NOx) na combustão industrial. Revista IPT, Tecnologia e Inovação, v.1, n.3, p.6-19, dez., 2016.

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