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Title	Incineration Behavior of Waste Liquid with Methane-Air Combustion in Triple Coaxial Tube Incinerator and Emissions of Exhaust Gas
Creator	Ohyashiki, Takuya; Itaya, Yoshinori; Matsuda, Hitoki; Hasatani, Masanobu
Publisher	Digitized by J. Willard Marriott Library, University of Utah
Date	1998
Spatial Coverage	presented at Maui, Hawaii
Abstract	The disposal, volume reduction, solidification, drying and incineration of industrial liquid waste have become common practice. In this work, the performance of the triple coaxial tube incinerator is studied. In the incinerator, waste liquids are atomized on the center line of the riser in parallel to the upward stream of methane air mixture so that evaporation and pyrolysis of the droplets take place successively in the flame. A solution of water-ethanol-ammonium sulfate is used as model waste liquid. The experiments are performed to examine the flammability limit, the NOx emission by the thermal NOx and the oxidization behavior of nitrogen compounds in the liquid when internally circulating particles are introduced in the riser. Applicability of the selective non-catalytic NOx reduction (SNCR) using urea as reductant agent was investigated as well. The enlargement of the flammable region and the low NOx emission are realized by the contribution of the circulating particles. It is also recognized that the temperature in the gas stream at the urea injection position is important factor for the SNCR.
Type	Text
Format	application/pdf
Language	eng
Rights	This material may be protected by copyright. Permission required for use in any form. For further information please contact the American Flame Research Committee.
Conversion Specifications	Original scanned with Canon EOS-1Ds Mark II, 16.7 megapixel digital camera and saved as 400 ppi uncompressed TIFF, 16 bit depth.
Scanning Technician	Cliodhna Davis
ARK	ark:/87278/s6sb48bd
Setname	uu_afrc
ID	11142
Reference URL	https://collections.lib.utah.edu/ark:/87278/s6sb48bd

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Title	Page 4
Format	application/pdf
OCR Text	Show detector and the N O x analyzer with chemical luminescence detector. Waste liquids are simulated by solutions of water, ethanol and ammonium sulfate. Ethanol and ammonium sulfate are used as examples of inflammable and contaminating components respectively. F C C particles of 100 m m mean diameter are fluidized in the riser. A 400-mesh wire is set as a filter of the gas/solid phase on the top of the riser to prevent the particles from going out with the flue gas. The auxiliary fuel is methane. The methane-air mixture (the fraction 1:3) and air are introduced into the inner and outer tubes of the burner respectively. Both the partial premixed and diffusion flames is formed in the riser. In the experiments of SNCR method using urea solution, no circulating particle is injected to confirm the effectiveness of this method in the simplest system. Urea is introduced by two ways. O n e is the atomization of 10 w t % urea solution from riser wall, the other is premixing of urea in the model waste liquid in similar concentration (5 wt%) to ammonium sulfate. The flow rate of air for atomization is maintained 1.3x10"4 m3/s in all runs. The rate and position of atomization of the urea solution and the atomization rate of the model liquid can be experimental parameters. The N O concentration in the flue gas and temperature in the riser is measured. 2. Results and discussion 2.1 Combustion characteristics Fig. 2 shows the two-dimensional temperature distribution in the riser. The circulating particles reduce significantly the temperature in the region close to the bottom of the riser, while upgrading of the temperature appears in the upper region of the riser in the cases of hold up of particles H=1.3x10"3and 3.8x10"3 From these facts, the internally circulating particles can contribute to the uniformity of the temperature distribution in the combustion zone as reported by Kataoka et al.[1]. Fig. 3 shows the effect of the hold up of the particles on the stable
Setname	uu_afrc
ID	11130
Reference URL	https://collections.lib.utah.edu/ark:/87278/s6sb48bd/11130