Stoves and furnaces – Hot-air furnaces – Preliminary air heater
Patent
1986-04-03
1987-09-15
Jones, Larry
Stoves and furnaces
Hot-air furnaces
Preliminary air heater
126110R, 127448, 1151341, 115900, F24H 312
Patent
active
046932330
ABSTRACT:
An air preheater wherein heated combustion gas is caused to flow in a straight path through the full lengths of preheater tubes while controlling the velocity and temperature of such gas to sweep liquid droplets from the preheater. The temperature of the preheated air is regulated by mixing inlet air and preheated air to control the temperature of the metal of the preheater at or near the dew point of the combustion gas to thereby inhibit the formation of large liquid droplets which cannot be removed with the gas moving at its velocity through the preheater, whereby essentially all corrosive liquid is removed with the gas to enable the use of carbon steel in the preheater. The air preheater has a bundle of substantially vertical preheater tubes through which combustion gases pass in a substantially straight flow path. The system normally operates with forced draft but a stack disposed integrally with the tubes enables the system to operate with natural draft when the forced draft is not operational.
REFERENCES:
patent: 1046308 (1912-12-01), Kitchen
patent: 1840836 (1932-01-01), Davis, Jr.
patent: 2291872 (1942-08-01), Brantly
patent: 2488267 (1949-11-01), Cassie
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patent: 2665840 (1954-01-01), Powell
patent: 4138062 (1979-02-01), Graden
patent: 4171089 (1979-10-01), Schossom
patent: 4467780 (1984-08-01), Ripke
"Ninety-Two Percent Minimum Heater Efficiency by 1980", by H. C. Meith and J. E. Hardie, a peper presented at 44th Refining Midyear Meeting, 5/15/79.
McHugh Stanley A.
Meith Hugo C.
Energy Technology, Inc.
Jones Larry
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