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Title	NOx Formation and Reducton in the Laminar Diffusion Flame
Creator	Yamanaka, K.; Yoshida, A.; Kotani, Y.; Mochida, S.; Kasahara, M.
Publisher	Digitized by J. Willard Marriott Library, University of Utah
Date	1998
Spatial Coverage	presented at Maui, Hawaii
Abstract	Recently the air is highly preheated by recycling the enthalpy of the fluegas in the combined power generation system. We focused our attention on NOx formation in the highly preheated air combustion. The combustion phenomena in the highly preheated air are still unclear. In the present study, the laminar, two dimensional, counterflow diffusion flame is established in the forward stagnation region of a porous cylinder by ejecting a fuel gas uniformly from the cylinder surface into a uniform laminar highly preheating air stream provided by the regenerator up to 1700 K. The extinction occurs at the higher strain rate, the higher the preheating air temperature becomes. The temperature dependency upon the strain rate is nearly exponential. The extinction flame temperature slightly increases with the strain rate. NOx formation in the diffusion flame is relatively high at the reference condition and the NOx in the diffusion flame increases with the increase of the preheating air temperature, but decreases with the strain rate.
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/s6mw2krq
Setname	uu_afrc
ID	10279
Reference URL	https://collections.lib.utah.edu/ark:/87278/s6mw2krq

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Title	Page 11
Format	application/pdf
OCR Text	Show 11 ~ ) NO2 were aspirated by a probe made of the water-cooled stainless steel tube. Therefore, it is possible to be converted NO to NO2 in the probe. However, the concentration of N 0 X (= NO + NO2) is not affected by this conversion. Concentrations of CO and CO2 are much higher those of the equilibrium state which means that the combustion reaction is incomplete due to the heat loss to the cylinder and also the short residence time. These concentrations for high strain rate, Figure 7, are larger than those of the reference states, Figure 6. For the case of high strain rate, Figure 7, the residence time is shorter than the reference states which leads to the incomplete combustion. 3.4 Effect of Flame Temperature on the NOx Concentration n Figure 8 shows the N 0 X (= NO + NO2) concentration profiles under the reference states and the high strain rate case as functions of flame temperature measured by the 20 E o. X O Z 15 10 T T • • 0 . * • rf CfiD cP a o • 2V/R = 3000 • 2V/R = 6000 1000 1200 1400 1600 Tf °C Figure 8. Effect of Flame Temperature on the N 0 X Formation.
Setname	uu_afrc
ID	10274
Reference URL	https://collections.lib.utah.edu/ark:/87278/s6mw2krq/10274