The Effect of Water/Residual Oil Emulsions on Air Pollutant Emissions and Efficiency of Commercial Boilers

[+] Author and Article Information
R. E. Hall

Industrial Environmental Research Laboratory, U. S. Environmental Protection Agency, Research Triangle Park, N. C.

J. Eng. Power 98(4), 425-430 (Oct 01, 1976) (6 pages) doi:10.1115/1.3446203 History: Received July 14, 1975; Online July 14, 2010


Two commercially available water-in-oil emulsifiers were tested to determine the effect of water/residual oil emulsions on air pollutant emissions and thermal efficiency of a packaged boiler. Of the two emulsifiers, one (Cottell reactor) utilized low pressure mechanical and ultrasonic energy and the other (total emulsifier) utilized high pressure mechanical energy. Each emulsifier was tested at a constant oil flow rate with varying amounts of water over a range of stoichiometric ratios. Water/residual oil emulsions from both emulsifiers significantly reduced particulate mass. With the Cottell reactor smoke emissions were significantly reduced, whereas with the Total emulsifier smoke emissions increased and peaked with a 20 percent water emulsion, then decreased as water was increased to 30 percent. Neither emulsifier had any significant effect on emissions of NO, SO2 , or HC when firing water/residual oil emulsions. Both emulsifiers were capable of improving efficiency by approximately 2 percent under certain conditions.

Copyright © 1976 by ASME
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