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Gordon, DL

1989

The Effect of Fuel Nitrogen on NOx Emissions From a Rotary-Kiln Incinerator

Lighty, J.S.; Gordon, D.L.; Pershing, D.W.; Owens, W.D.; Cundy, V.A. and Leger, C.B.
Stationary NOx Symposium, San Francisco, California, 1989. Funded by Louisiana State University/Hazardous Waste Research Center, and ACERC (National Science Foundation and Associates and Affiliates).

While fuel NOx formation has been extensively studied for coal combustion, little information is available on NOx formation for nitrogenous waste constituents. These wastes, usually destroyed in hazardous-waste incinerators, are prevalent and exist as solids (plastics, nylongs) or liquids (dyes, process waste).

Results are presented from studies conducted in a scaled, batch rotary-kiln simulator. Constituent parameters, i.e. constituent type and percent fuel nitrogen, were studied at 730ºC. Sorbent was contaminated with a variety of constituents ranging in concentrations from 0.5% to 3.0% nitrogen by weight (for 681 g charge).

NOx exhaust-gas concentrations ranged from 60-80 ppm for a base run (no fuel nitrogen) to 200-1750 ppm for a nitrogenous waste. Results inducated that, at higher concentrations, more NOx was formed, accompanied by an increase in temperature. Higher concentrations also resulted in reduced percent conversions of fuel nitrogen to NOx. Evolution for different constituents, given the same concentration, varied; aniline formed more NOx than pyridine, followed by ethylenediamine.