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US 2024/0132983 A1Published application
Method of manufacturing steel
AssigneeArcelorMittal
InventorsHugo DA GAMA CAMPOS, Jean-Martin VAN DER HOEVEN
Life of this patent
Estimating the term…
Abstract
A method to manufacture a global tonnage of steel products in at least two steelmaking units wherein expected level emissions are calculated and compared with pre-defined targets.
Claims11
1-10. (canceled)
11:
- A method of manufacturing a given tonnage of steel products Tglob in at least two steelmaking units Si, the method comprising the following steps:
- a. a target definition step wherein
- an overall expected level Eglob of CO2 emissions from all steelmaking units Si to manufacture such tonnage Tglob of steel products is defined,
- a maximum level of CO2 emissions Emaxi is predefined for each steelmaking unit Si,
- b. a calculation step wherein an expected level of CO2 emissions Eexpi is calculated for each steelmaking unit Si, such calculation being done considering all CO2 contributions linked to raw materials, energy sources and processes initially selected for manufacturing the steel products following an initial manufacturing route MRi,
- c. a comparison step between respective calculated expected levels Eexpi and predefined targets Emaxi, wherein:
- i. if any or all Eexpi is above its respective Emaxi, modifying the final selection of any or all the raw materials, energy sources and processes to define an optimized manufacturing route OMRi with optimized levels of CO2 emissions, Eoptimi being lower than or equal to Emaxi, and
- d. a production step wherein such tonnage Tglob of steel products is manufactured in said steelmaking units Si according either the original manufacturing route MRi or the optimized manufacturing route OMRi when defined.
5 more elements
12:
- The method as recited in claim 11 wherein a first steel product is manufactured in the first steelmaking unit and then send to the second steelmaking unit to be transformed into a second steel product.
13:
- The method as recited in claim 11 wherein finally selected raw materials are chosen from the group consisting of coal, coke, iron ore, biomass, sintered ore, agglomerates, pellets, direct-reduced iron (DRI), scrap, mineral additions, alloying elements, oxygen and hydrogen.
14:
- The method as recited in claim 13 wherein the finally selected raw material are chosen from the group consisting of biomass, scrap, cold-bonded pellets, direct-reduced iron (DRI), mineral additions, alloying elements, oxygen and hydrogen.
15:
- The method as recited in claim 13 wherein scrap is among the finally selected raw materials and is of different type and is chosen from the group consisting of:
- old scrap, new scrap, prime scrap, home scrap, pit scrap, shredded, plates and structure scrap, heavy melting scrap, cast scrap, coil scrap and busheling scrap.
16:
- The method as recited in claim 11 wherein finally selected energy sources are chosen among renewable electricity, electricity produced by internal recycling of exhaust gas from the steel manufacturing process or by capture of heat released by products from the steel manufacturing process.
17:
- The method as recited in claim 11 wherein finally selected processes are chosen among direct reduction processes, hydrogen-based ironmaking, steel electrolysis, blast furnace with top-gas recycling, blast furnace with top-gas conversion, electric-arc-furnace steelmaking, converter steelmaking, scrap melting.
18:
- The method as recited in claim 11 further comprising a step, after step d, of establishing a certificate indicating the optimized level Eoptimi of CO2 emissions associated to part or all of the tonnage Tglobal of manufactured steel products.
19:
- The method as recited in claim 11 further comprising a step, after step d, of:
- calculating the cumulated value Σ(Eoptimi) of CO2 emitted in step d) of all steelmaking units Si for manufacturing said tonnage Tglobal of steel products,
- calculating the difference Δem between such cumulated value Σ(Eoptimi) and the overall expected amount Eglob of CO2 emissions for said tonnage Tglobal of steel products as defined in step a) to determine the amount Enot of CO2 that was not emitted,
- allocating all or part of this not-emitted amount Enot of CO2 to a tonnage Tgreen of steel products, Tgreen being lower than Tglobal, to calculate a reduced level of CO2 emissions for such tonnage Tgreen of steel products by reducing the expected level of CO2 emissions triggered by its manufacturing by such not-emitted amount of CO2, and
- establishing a certificate indicating said reduced level of CO2 emissions associated to such tonnage Tgreen of steel products.
2 more elements
20:
- The method as recited in claim 19 wherein said reduced level of CO2 emissions associated to such tonnage Tgreen of steel products is equal to zero.