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Title	Stability Characteristics and Emission Levels of a Laboratory Hot Water Heater Utilizing a Weak-Swirl Burner
Creator	Yegian, D. T.; Cheng, R. K.
Publisher	Digitized by J. Willard Marriott Library, University of Utah
Date	1995
Spatial Coverage	presented at Monterey, California
Abstract	This paper reports the test results of a collaboration between Lawrence Berkeley National Laboratory and Teledyne Laars to assess the viability of incorporating the Weak-Swirl Burner (WSB) into a 15 kW (50,000 Btu/hour) Telstar spa heater. By stabilizing premixed lean combustion down to equivalence ratios $ ~ 0.6, the WSB greatly reduces NOx levels by minimizing thermally generated NOx through the Zeldovich mechanism. The first set of experiments focus on establishing the WSB's minimum and maximum swirl requirement (corresponding to blowoff and flashback) for varying $, power levels, burner size, and enclosure. The second set of experiments evaluates the performance of a laboratory water heater where the WSB is incorporated into a Telstar heat exchanger. I t was found that the laboratory test station achieves "low" « 50 ppm) and "ultra-low" « 25 ppm) NOx emissions without compromising the thermal efficiency. The optimum operating condition is for $ = 0.8 at 18 kW (60,000 Btu/hr) where NOx < 25 ppm and CO < 50 ppm (both corrected to 30/0 02). The results will be used as design guideline for using the low emission WSB in a prototype. The stable operation we found for enclosed WSB demonstrates the potential for its use in other combustion applications as well.
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/s6ff3vz2
Setname	uu_afrc
ID	9530
Reference URL	https://collections.lib.utah.edu/ark:/87278/s6ff3vz2

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Title	Page 15
Format	application/pdf
OCR Text	Show This work was supported by the Department of Energy, Energy Research Laboratory Technology Transfer through a Cooperative Research and Development Agreement with Teledyne Laars, Moorpark, California. The authors would like to thank Mr. Gary Hubbard for developing the computer software, Mr. Ken Hom for fabricating the burner, and Mr. Miguel (fAlex (f Bracchini for assisting in the stability limit experiments. REFERENCES 1. Bowman, C.T., 1975, "Kinetics of Pollutant Formation and Destruction In Combustion", Combustion and Flame, Vol. 1, pp. 33-45. 2. Chan, C.K., Lau, K.S., Chin, W.K., and Cheng, R.K., 1992, "Freely Propagating Open Premixed Turbulent Flames Stabilized by Swirl", Twenty-Fourth Symposium (International) on Combustion, The Combustion Institute, pp. 511-518. 3. Cheng, R.K., and Shepherd, I.G., 1991, "The Influence of Burner Geometry on Premixed Turbulent Flame Propagation", Combustion and Flame, Vol. 85, pp. 7-26. 4. Beer, J.M., and Chigier, N.A., 1972, Combustion Aerodynamics, Applied Science Publications, London. 5. Claypore, T.C. and Syred, N., Eighteenth Symposium (International) on Combustion, The Combustion Institute, p. 81, 1981. 6. Keller, J.O., Bramlette, T.T., Barr, P.K., and Alvarez, J.R., 1994, "NOx and CO Emissions from a Pulse Combustor Operating in a Lean Premixed Mode", Combustion and Flame, Vol. 99, pp. 460-466. 15
Setname	uu_afrc
ID	9529
Reference URL	https://collections.lib.utah.edu/ark:/87278/s6ff3vz2/9529