Method and apparatus for the control of the carbon level of a ga

Details Method and apparatus for the control of the carbon level of a ga Method and apparatus for the control of the carbon level of a ga

1979-03-19

1983-02-08

Sheehan, John P.

Metal treatment

Compositions

Heat treating

148 16, 148 166, 148 203, C21D 148

Patent

active

043727905

ABSTRACT:
A method and device for control of the carbon level of a gas mixture reacting in a heat treatment furnace, which gas mixture arises by means of the introduction of a fuel containing hydrocarbon into the furnace chamber, the reaction products of which are not in a state of water-gas equilibrium and not in a state of methane gas equilibrium and which gas mixture has an excess of methane. The controlled condition is determined by a first measurement device from the portion of the gas component CO which is present in the furnace chamber as a first measured value, and by a second measurement device from the electrical voltage of an oxygen-ion-conducting solid body electrolyte as a second measured value and by a third measurement device from the furnace chamber temperature as the third measured value. A regulating member is controlled as a result to automatically change the quantity flow of the supply to the furnace chamber until correspondence of the measured carbon level with its desired value exists.

REFERENCES:
patent: 4035203 (1977-07-01), L'Hermite et al.
patent: 4049473 (1977-09-01), Davis et al.
patent: 4145232 (1979-03-01), Solomon
patent: 4191598 (1980-03-01), Conybear et al.
"Practical Experience in the Control of Heat Treatment Atmosphere Using the Oxygen Probe", N. Beach, 5th ed. Ind. Proc. Heat Conf., 1972.
"Control of Carbon Potential in Heating Atmosphere Using a Carbon Sensor", Blumenthal et al., ASM Heat Treating Conf., Chicago, 9/75.

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