公开(公告)号：US20240360526A1

公开(公告)日：2024-10-31

申请号：US18687038

申请日：2022-08-26

Applicant: PAUL WURTH S.A.

Inventor： Cristiano CASTAGNOLA ,  Fabio CRAVINO ,  Silvia ILACQUA ,  Stefano MAGNANI ,  Jan KRULL

IPC: C21B13/00 ,  C21B5/06 ,  C21B13/02

CPC classification number: C21B13/0073 ,  C21B5/06 ,  C21B13/02 ,  C21B2100/22 ,  C21B2100/80 ,  C21B2300/02

Abstract: A method for producing iron containing products includes: operating a blast furnace plant to produce liquid pig iron from blast furnace charge material, whereby metallurgical gas having blast furnace top gas is generated; operating a direct reduction plant to produce direct reduced iron products from iron ore loaded into the top of a direct reduction furnace, a stream of reducing gas being introduced into the direct reduction furnace, the direct reduction plant including a reformer or heater device from which the stream of reducing gas is discharged, whereby top gas is generated by the direct reduction furnace; where a first stream of direct reduction plant top gas is treated in an enriching stage configured for enriching in reducing species, and forwarded to the blast furnace plant to be used therein as reducing gas; and where a first stream of the metallurgical gas (B3/B6) is forwarded to the reformer or heater device of the direct reduction plant to be used therein as fuel gas. Also disclosed is a corresponding metallurgical plant.

公开(公告)号：US20240052441A1

公开(公告)日：2024-02-15

申请号：US18257748

申请日：2021-12-17

Applicant: PAUL WURTH S.A.

Inventor： Cristiano CASTAGNOLA ,  Fabio CRAVINO ,  Silvia ILACQUA ,  Stefano MAGNANI ,  Jan KRULL

IPC: C21B13/00 ,  C21B13/02 ,  C25B15/08 ,  C01B3/38

CPC classification number: C21B13/0073 ,  C21B13/02 ,  C25B15/081 ,  C01B3/38 ,  C21B2100/24 ,  C21B2100/26 ,  C21B2100/44 ,  C21B2100/66 ,  C21B2100/80 ,  C01B2203/06 ,  C01B2203/1241 ,  C01B2203/0205

Abstract: The invention relates to the production of direct reduced iron, DRI, where a hydrogen direct reduction is synergistically operated in the context of an industrial plant. The hydrogen reduction operates with reducing gas comprising at least 85 vol. % hydrogen, and receives a make-up hydrogen stream. At least part of the make-up hydrogen stream is produced on site. by at least one of (i) electrolysis means configured to produce hydrogen from steam recovered from one or more components of the industrial plant and/or from steam generated using waste heat and/or hot gases emitted by the one or more components; and (ii) gas shift reactor means configured to convert CO-bearing gas emitted by at least one component of the industrial plant into hydrogen and to remove CO2.

公开(公告)号：US20230272495A1

公开(公告)日：2023-08-31

申请号：US18018351

申请日：2021-07-23

Applicant: PAUL WURTH S.A.

Inventor： Jan KRULL ,  Cristiano CASTAGNOLA ,  Stefano MAGNANI

IPC: C21B13/00

CPC classification number: C21B13/0073 ,  C21B2100/22 ,  C21B2100/26 ,  C21B2100/282 ,  C21B2200/00

Abstract: A method of operating a metallurgic plant for producing iron products includes the following steps, wherein the metallurgic plant includes a direct reduction plant and an ironmaking plant, the metallurgic plant:



feeding an iron ore charge into the direct reduction plant to produce direct reduced iron products,
operating the ironmaking plant to produce pig iron, wherein biochar is introduced into the ironmaking plant as reducing agent, and whereby the ironmaking plant generates offgas containing CO and CO2, and treating offgas from the ironmaking plant in a hydrogen enrichment unit to form a hydrogen-rich stream and a CO2-rich stream. The hydrogen-rich stream is fed directly or indirectly to the direct reduction plant. The CO2-rich stream is converted to be valorized in the direct reduction plant.




A corresponding metallurgic plant is also related.

公开(公告)号：US20250011888A1

公开(公告)日：2025-01-09

申请号：US18702157

申请日：2022-10-14

Applicant: PAUL WURTH S.A.

Inventor： Jan KRULL ,  Thomas HANSMANN ,  Katia PAPALIA

IPC: C21B11/10 ,  C21B13/00

Abstract: A method for reducing carbon footprint in operating a metallurgical plant for producing pig iron, including: pre-heating iron ore fines in a first electric pre-heater to obtain pre-heated iron ore fines partially reducing the pre-heated iron ore fines in one or more fluidized bed reactors in the presence of a hot reducing gas to obtain partially reduced iron; feeding the partially reduced iron to a submerged arc furnace; further reducing and melting the partially reduced iron within the submerged arc furnace in the presence of a carbonaceous material to obtain molten pig iron; where the hot reducing gas includes hydrogen, syngas, off-gas of the submerged arc furnace, other off-gases from the metallurgical plant, or mixtures of two or more thereof, where the syngas is produced from natural gas or biomethane, blast furnace gas, off-gas of the submerged arc furnace, other off-gases from the metallurgical plant, or mixtures of two or more thereof in the presence of air or oxygen enriched air, steam or carbon dioxide in one or more reforming reactors, where the hot reducing gas has a temperature above 550° C., and where the partially reduced iron has a metallization degree of 55 to 75%.

公开(公告)号：US20240191314A1

公开(公告)日：2024-06-13

申请号：US18286667

申请日：2022-04-20

Applicant: PAUL WURTH S.A.

Inventor： Jan KRULL ,  Katia PAPALIA

IPC: C21B13/12 ,  C21B13/00 ,  F27B3/22 ,  F27D17/00

CPC classification number: C21B13/12 ,  C21B13/0006 ,  C21B13/0073 ,  F27B3/22 ,  F27D17/003 ,  C21B2100/80 ,  C21B2300/02

Abstract: The disclosure discloses a method of operating an electric arc furnace, the method comprising capturing, from at least one facility of a steel mill, a heated metallurgical gas comprising water and carbon monoxide; conducting, by a reactor supply line, said metallurgical gas to a reactor; transforming, by a treatment of said metallurgical gas within said reactor, the carbon monoxide and water into hydrogen and carbon dioxide according to a water-gas shift reaction; and subsequently separating said hydrogen by a separation device. The method is characterized in that it further comprises providing an iron-bearing material, which comprises iron mainly in the form of iron oxide, to the electric arc furnace; at least partially melting the iron-bearing material to obtain a molten bath; conducting, by a furnace supply line, said hydrogen to the electric arc furnace, which is arranged downstream of the furnace supply line; and injecting, by a plurality of hydrogen injection devices, said hydrogen into said electric arc furnace, such that said hydrogen reacts as a reducing agent for reducing iron oxide in the molten bath during a smelting operation of the electric arc furnace.