Reheating metal bodies with recovered blast-furnace energy

Details Reheating metal bodies with recovered blast-furnace energy Reheating metal bodies with recovered blast-furnace energy

1982-09-13

1984-07-31

Camby, John J.

Heating

Processes of heating or heater operation

Treating an article, container, batch or body as a unit

373 18, 266140, 431 5, 432 29, F27D 300, F23D 1320, C21B 900

Patent

active

044627920

ABSTRACT:
Metal bodies such as billets and blooms are reheated for rolling in a metal-refining operation having a blast furnace by first heating the top gas of the blast furnace to at least 800.degree. C. by means of a plasma torch, then, before the gas has cooled appreciably, burning the heated top gas in a preheating chamber. The metal bodies are exposed in the preheating chamber to the heat of the burning and heated top gas. The heated top gas is mixed with combustion-inducing gas to burn it. Before it is mixed with the heated top gas it is preheated by heat exchange with combustion-product gas withdrawn from the preheating chamber. In this manner it is possible to raise the temperature of this combustion-inducing gas to at least 600.degree. C., so that the burners firing the preheating chamber burn clean. In addition much of the heat of the process is recovered, again reducing energy costs for the system.

REFERENCES:
patent: 3049300 (1962-08-01), Lewis et al.
patent: 3148868 (1964-09-01), Sidwell
patent: 3715110 (1973-02-01), Jensen et al.
patent: 3970290 (1976-07-01), Santen et al.

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