North American Manufacturing Company, Inc.

Burnham Corporation

Combustion Service and Equipment Corporation

Albert Morrison, Iii

Harold B Infield

William A Tauskey, Sr

A multi-fuel boiler is provided in which coal is burned in combination with oil or gas in such manner that the particulate emission from the coal, normally relatively high, is reduced to a level comparable to oil. In one example, coal of a quality that would normally burn with a Bacharach smoke spot test number of 6 can be burned with a test number below 2. This is accomplished by utilization of a horizontal oil or gas flame directed across the flue gas exit of the combustion chamber in opposition to the flow of coil combustion gases to change the normal flow pattern of the combustion gases. This creates turbulence, which provides additional combustion time at combustion temperatures in the presence of excess air. Efficiency in particulate removal increases with increased use of oil or gas, but has been found to reach its most efficient, asymptotic point with no more than about 25% to 30% of oil relative to the total input (on a BTU basis), after which the addition of additional oil or gas does not increase particulate removal. At this point the boiler will have the clean burning characteristics of oil, but will be using 70% to 75% coal.

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Landisville, PA, United States of America

Albert Morrison, Iii