Heating – Processes of heating or heater operation – Of operating a furnace utilizing a heat storage mass
Patent
1980-03-18
1981-11-10
Camby, John J.
Heating
Processes of heating or heater operation
Of operating a furnace utilizing a heat storage mass
110254, 122 20B, 432180, F27D 1700
Patent
active
042995612
ABSTRACT:
A system for recovering heat from combustion flue gas, which transfers heat from the flue gas into combustion-supporting air, which is then used to burn a fuel in a combustion zone in a furnace or the like, so that useful heat is generated and a hot combustion flue gas is formed. Two heat sinks are provided, each for alternate absorption of heat from the hot flue gas, and desorption of heat into ambient combustion air so that the air is preheated. A reversible fan or blower is associated with each sink. The hot flue gas is passed successively through one heat sink and fan to atmospheric discharge for a finite time interval, while concomitantly passing cold and usually ambient combustion air successively through the other fan and heat sink so that the air is heated and a preheated combustion air stream is formed, which is subsequently passed to the combustion zone. After the finite time interval, the reversible fans are reversed for another finite time interval usually equal to the first time interval. Concomitantly, the flue gas is then passed to the othyer heat sink and the preheated combustion air now discharged from the one heat sink is passed to the combustion zone. Increments of preheted combustion air stream are thus alternately formed in the one heat sink and the other heat sink, and heat is recovered from the hot flue gas alternately in the two heat sinks.
REFERENCES:
patent: 2522639 (1950-09-01), Royster
patent: 3170678 (1965-02-01), Keefer
patent: 4121563 (1978-10-01), Gold
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