Process and plant for producing hot metal
AssigneeOutotec Oyj
InventorsJean-Paul Nepper, Tobias Stefan
Life of this patent
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Abstract
A process for producing hot metal includes partially reducing granular raw materials containing iron oxide with a carbonaceous reducing agent in a fluidized bed reactor at a temperature of at least 850° C. so as to obtain a reduced mixture. The reduced mixture is cooled to between 600° C. and 800° C. in a heat exchanger apparatus using a preheated process gas as a cooling medium that is preheated to between 300° C. and 500° C. before being introduced into the heat exchanger apparatus. The reduced mixture is then supplied to a smelting reduction unit via a discharge system.
Claims15
A process for producing hot metal, comprising:
- partially reducing granular raw materials containing iron oxide with a carbonaceous reducing agent in a fluidized bed reactor at a temperature of at least 850° C. so as to obtain a reduced mixture;
- preheating a process gas to a temperature between 300° C. and 450° C.;
- introducing the preheated process gas into a heat exchanger apparatus;
- cooling the reduced mixture to between 600° C. and 800° C. in the heat exchanger apparatus using the preheated process gas as a cooling medium;
- and then
- supplying the reduced mixture to a smelting reduction unit via a discharge system.
A plant for producing hot metal, comprising:
- charging devices for iron ore and reducing agent;
- a fluidized bed reactor configured to partially reduce the iron ore and provide a reduced mixture;
- a smelting reduction unit configured to produce hot metal;
- and
- a heat exchanger apparatus connected between the fluidized bed reactor and the smelting reduction unit and configured to receive the reduced mixture from the fluidized bed reactor, the heat exchanger apparatus being connected with a duct for preheated process gas and with the smelting unit via a discharge system, the heat exchanger apparatus being a flash cooler.
Dependencies are inferred from the claim text.