METHOD AND IMPROVED FURNANCE FOR REDUCING EMISSIONS OF NITROGEN OXIDES
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United States of America Patent
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Feb 9, 2017
app pub date -
Jul 28, 2016
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Jul 28, 2015
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Abstract
A method and improved furnace for reducing nitrogen oxide emissions from a furnace having a plurality of primary fuel injectors and a plurality of spaced apart over-fire air injectors positioned above the primary fuel injectors are disclosed. Injection of over-fire air produces zones of cooler combustion gasses containing over-fire air that separate zones of hot combustion gasses containing nitrogen oxides. Reburn fuel injectors inject a reburn fuel into the zones of hot combustion making the effluent combustion gases containing nitrogen oxides partially or totally fuel-rich in order to further reduce nitric oxide.
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