Temperature control system for pyrolysis furnace

Details Temperature control system for pyrolysis furnace Temperature control system for pyrolysis furnace

1986-01-27

1987-03-17

Makay, Albert J.

Furnaces

With control means responsive to a sensed condition

Feed control

110193, 110210, 110215, 110236, 432 37, 432 72, F23N 502

Patent

active

046498346

ABSTRACT:
A batch-type pyrolysis furnace fired by a main gas burner and an afterburner, is effectively safeguarded from explosions and runaway fires due to an undue build-up of flammable vapors within its main chamber, by the simple expedient of maintaining a fire under controlled temperature conditions in the main chamber. This is done by a dual-stage control system requiring three thermocouples, one (first) in the main chamber, a second in the exhaust stack downstream of the afterburner, and a third upstream of the afterburner in the vent passage ("throat") connecting the main chamber with the afterburner chamber. The first thermocouple in the main chamber senses the ambient, essentially instantaneous temperature at that location. The effectiveness of the control system, in large measure, derives from the unexpected difference in temperatures sensed by the first and third thermocouples.

REFERENCES:
patent: 3705711 (1972-12-01), Seelandt et al.
patent: 3767179 (1973-10-01), Larson
patent: 3839086 (1974-10-01), Larson
patent: 4013023 (1977-03-01), Lombana et al.
patent: 4145979 (1979-03-01), Lilley et al.
patent: 4270898 (1981-06-01), Kelly
patent: 4557203 (1985-12-01), Mainord

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