Ironmaking method and associated plant
OwnerEric DE CONINCK, Dominique SERT +3inventors
InventorsEric DE CONINCK, Dominique SERT, Eric Alain Gabriel HESS, Patrick NEGRO, Jean-Luc Didier REBOUL
Life of this patent
Estimating the term…
Abstract
Method to produce hot metal in a blast furnace including at least two levels of gas injection wherein the blast furnace top gas is recovered and subjected to an oxidation step using water-gas shift reaction to transform at least a part of the carbon monoxide from the recovered blast furnace top gas into carbon dioxide and hydrogen, the carbon dioxide is then separated to obtain a CO2-rich stream and a H2-rich stream, at least a part of it being injected into the blast furnace at the second level of gas injection.
Claims22
1-21. (canceled)
A method to produce hot metal in at least one blast furnace including at least two levels of gas injection and emitting a blast furnace top gas when working, the method comprising at least the steps of:
- A. charging an iron-containing charge and a first carbon-based reductant into the blast furnace;
- B. injecting at the first level a hot blast having a temperature upper or equal to 1000° C., the hot blast comprising oxygen;
- C. recovering the blast furnace top gas;
- D. subjecting the recovered blast furnace top gas to an oxidation step using water-gas shift reaction to transform at least a part of the carbon monoxide from the recovered blast furnace top gas into carbon dioxide and hydrogen;
- E. separating carbon dioxide from the oxidized blast furnace top gas to obtain a CO2-rich stream and a H2-rich stream;
- and
- F. injecting at least a part of the H2-rich stream into the blast furnace at the second level of gas injection.
An ironmaking production plant comprising:
- a. at least one blast furnace producing hot metal and emitting a blast furnace top gas, the blast furnace comprising first and second gas injectors respectively located at two different levels over the height of the blast furnace;
- b. the first gas injector designed to inject into the blast furnace a hot blast having a temperature upper or equal to 1000° C., the hot blast comprising oxygen;
- c. a gas recovery and treatment device able to capture the blast furnace top gas and comprising an oxidizer to perform oxidation of at least a part of the carbon monoxide from the recovered blast furnace top gas into carbon dioxide and hydrogen and a separator for separating carbon dioxide from the oxidized blast furnace top ga to obtain a CO2 rich stream and a H2-rich stream;
- and
- d. the second gas injector designed to inject the H2-rich stream into the blast furnace.
Dependencies are inferred from the claim text.