COMPOSITE SYSTEM FOR PRODUCING STEEL AND METHOD FOR OPERATING THE COMPOSITE SYSTEM - Patent application
The integrated plant system converts blast furnace gas carbon monoxide to hydrogen for efficient chemical production, reducing CO2 emissions and stabilizing operations by utilizing hydrogen recovery and stoichiometric gas adjustment, thereby enhancing sustainability and efficiency in steel production.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-03-08
- Publication Date
- 2026-03-11
AI Technical Summary
The high CO2 emissions and large CO2 footprint in integrated steel production processes are a significant challenge, necessitating improvements in sustainability and CO2 balance while ensuring stable and continuous plant operation.
An integrated plant system that includes a blast furnace, basic oxygen furnace, hydrogen recovery plants, and a chemical plant, where carbon monoxide from blast furnace gas is converted to hydrogen via the water-gas shift reaction, and the resulting hydrogen is used to adjust the stoichiometric ratio of gases for chemical production, enabling CO2 capture and utilization without external hydrogen supply.
This approach reduces CO2 emissions by chemically binding a larger amount of CO and CO2, stabilizes chemical plant operations, and enhances gas utilization efficiency, achieving a more sustainable and efficient steel production process.
Smart Images
Figure 2026508595000001_ABST
Abstract
Description
[Technical Field]
[0001] The present invention relates to a method of operating an integrated plant and system for steel production. [Background technology]
[0002] An integrated plant for steel production comprises a blast furnace for pig iron production, a basic oxygen furnace (BOF) steel plant for crude steel production, an interconnection system for gases obtained in pig iron production and / or crude steel production, and a chemical plant connected to a gas pipeline system.
[0003] In a chemical plant, chemical products can be produced from the supplied gas streams, each containing components of the final product.
[0004] In a blast furnace, pig iron is obtained from iron ore, additives such as coke, and other reducing agents such as coal, oil, gas, biomass, recycled plastic waste, or other carbon- and / or hydrogen-containing materials. The inevitable products of the reduction reaction are CO, CO2, and especially hydrogen and steam. The blast furnace top gas (TOPG), also called top gas and / or blast furnace gas, extracted from the blast furnace process often has a high nitrogen content and may contain impurities, as well as the components mentioned above. The amount of gas and the composition of blast furnace TOPG depend on the feedstock and operating mode and are subject to variation. However, blast furnace TOPG typically contains 35%-60% N2 by volume, 20%-30% CO2 by volume, 20%-30% CO2 by volume, and 2%-15% H2 by volume. Approximately 30% to 40% of the blast furnace top gases formed in pig iron production are typically used in the blast heaters to heat the high temperature blast for the blast furnace process, while the remaining amount of top gas can also be utilized externally, for example in other parts of the plant for heating purposes or for power production.
[0005] In a basic oxygen furnace steel plant connected downstream from the blast furnace process, pig iron is converted into crude steel. By blowing oxygen through the liquid pig iron, troublesome impurities such as carbon, silicon, sulfur, and phosphorus are removed. Because the oxidation process generates intense heat, scrap is often added as a coolant, at up to 25% of the pig iron. Additionally, lime and alloying agents are added to form slag. Basic oxygen furnace gas, which has a high CO content and also contains nitrogen, hydrogen, and CO2, is extracted from the steel converter. A typical basic oxygen furnace gas composition is 50–70% CO by volume, 10–20% N2 by volume, approximately 15% CO2 by volume, and approximately 2% H2 by volume. The basic oxygen furnace gas is either flared or, in modern steel mills, captured and sent for energy utilization.
[0006] The integrated plant may be operated in combination with a coke plant. In this case, the integrated plant described at the beginning further includes a coke oven plant in which coal is converted into coke by a coking process. Coking of coal into coke produces coke oven gas, which contains a high hydrogen content and a significant amount of CH4. Typically, coke oven gas contains 55%-70% by volume of H2, 20%-30% by volume of CH4, 5%-10% by volume of N2, and 5%-10% by volume of CO2. Furthermore, coke oven gas contains CO2, NH3, and H2S in part. In practice, coke oven gas is utilized, for example, in various parts of factories for heating purposes and in power plant processes for generating electricity. It is also known that coke oven gas can be used together with blast furnace top gas or basic oxygen furnace gas for the production of synthesis gas.
[0007] In integrated metallurgical plants operated in conjunction with a coking plant, approximately 40-50% of the raw gases obtained as blast furnace top gas, basic oxygen furnace gas, and coke oven gas are used in chemical engineering processes. Approximately 50-60% of the gases formed are sent to power plants and used to generate electricity. The electricity generated in the power plants covers the power demand for the production of pig iron and crude steel. Ideally, the energy balance is closed, so that, apart from iron ore as an energy source and carbon in the form of coal and coke, no further energy inputs are required and no products other than crude steel and slag leave the integrated plant. Summary of the Invention [Problem to be solved by the invention]
[0008] The problem with the prior art is the high CO2 emissions, especially the large CO2 footprint.
[0009] Against this background, the aim of the present invention is to improve the sustainability and CO2 balance of the entire process, in particular the CO2 emissions, and to reduce the CO2 footprint while enabling stable, continuous and sustainable plant operation. [Means for solving the problem]
[0010] This object is achieved by an integrated plant for steel production according to claim 1 and a method for operating an integrated plant according to claim 8.
[0011] The present invention provides an integrated plant for steel production, comprising a blast furnace for pig iron production, a basic oxygen furnace steel plant for crude steel production, a blast furnace gas conduit system for gases obtained in the pig iron production, in particular an interconnection system for gases obtained in the pig iron production and / or crude steel production, comprising carbon-containing gases, such as CO2-containing gases, CO2-containing gases or combinations thereof, a plant for hydrogen recovery, a chemical plant connected to the interconnection system, a hydrogen conduit for hydrogen-containing gases obtained in the hydrogen recovery, in particular hydrogen, connected to the interconnection system upstream of the chemical plant in the flow direction, a hydrogen conduit for hydrogen-containing gases obtained in the hydrogen recovery, in particular hydrogen, and a system for hydrogen-containing gases obtained in the hydrogen recovery, in particular hydrogen, and a system for hydrogen-containing gases obtained in the pig iron production. and / or a mixing device for gases obtained in crude steel production, the mixing device being arranged downstream of the plant for hydrogen recovery and upstream of the chemical plant in the flow direction, and in particular connected to the interconnection system with a connecting system, for mixing gases obtained in pig iron production and / or crude steel production with hydrogen-containing gases obtained in hydrogen recovery, in particular hydrogen, for example, to adjust the stoichiometric ratio of the gas composition in the interconnection system before being input to the chemical plant, the blast furnace gas conduit system being connected to the plant for hydrogen recovery as an input conduit to the plant for hydrogen recovery, and the hydrogen conduit being connected to the plant for hydrogen recovery as an output conduit from the plant for hydrogen recovery.
[0012] The present invention further provides a method for operating an integrated plant for steel production, comprising a blast furnace for pig iron production, a basic oxygen furnace steel plant for crude steel production, a blast furnace gas conduit system for gases obtained in the pig iron production, an interconnection system for gases obtained in the pig iron production and / or crude steel production, in particular comprising carbon-containing gases, such as CO2-containing gases, CO2-containing gases or combinations thereof, a plant for hydrogen recovery, a chemical plant connected to the interconnection system, a hydrogen conduit for hydrogen-containing gases obtained in the hydrogen recovery, in particular hydrogen, which is connected to the interconnection system upstream of the chemical plant in the flow direction, a mixing device for hydrogen-containing gases obtained in the hydrogen recovery, in particular hydrogen, and gases obtained in the pig iron production and / or crude steel production, in the flow direction and upstream of the chemical plant, in particular connected to the interconnection system, in particular comprising a mixing device for mixing gas obtained in pig iron production and / or crude steel production with hydrogen-containing gas obtained in hydrogen recovery, in particular hydrogen, in order to form, for example, a stoichiometric ratio of the gas composition in the interconnection system before being fed into the chemical plant, wherein the blast furnace gas conduit system is connected to the hydrogen recovery plant as an input conduit to the hydrogen recovery plant, and the hydrogen conduit is connected to the hydrogen recovery plant as an output conduit from the hydrogen recovery plant, the mixing device forming a mixed gas, in particular used to form a mixed gas having a stoichiometric mixing quotient formed by a dividend which is the difference between the molar amount of hydrogen as the minuend and the molar amount of carbon dioxide as the minuend, and a divisor which is the sum of the molar amounts of carbon monoxide and carbon dioxide.
[0013] The present invention can be implemented in an integrated plant for steel production and in a method of operating an integrated plant. The devices of the integrated plant may be present singly and / or in pairs.
[0014] The integrated plant for steel production of the present invention has the advantage over conventional plant linkages in that carbon monoxide present in blast furnace gas is converted to hydrogen by the water-gas shift reaction, and hydrogen or hydrogen-enriched gas for the conversion of carbon-containing gases, such as CO-containing gas, CO2-containing gas, or a combination thereof, can be supplied from the metallurgical gas to a chemical plant, thus enabling a larger amount of CO and / or CO2 to be chemically bound without the need for an external hydrogen supply, thereby reducing CO2 emissions. The physical recycling of blast furnace gas and recovery of hydrogen from blast furnace gas allows for a more efficient utilization of blast furnace gas than conventional conversion of blast furnace gas to electricity in a power plant.
[0015] The inventive method of operating an integrated plant has the advantage over conventional methods that apart from recovering hydrogen or syngas for conversion in a chemical plant, CO2 can also be separated, which can be converted in the chemical plant and / or utilized by carbon capture and utilization or carbon capture and storage, thus reducing CO2 emissions. DETAILED DESCRIPTION OF THE INVENTION
[0016] Chemical plants can produce chemical products from the supplied gas streams, each containing a component of the final product. The chemical products can be, for example, methanol or higher alcohols, or other hydrocarbon compounds. The performance of chemical plants, particularly their production volume, is controlled as a function of the amount of gas supplied to these plants. A major challenge for chemical plants is their dynamic operating modes, in which the plant's workload varies. The inventive integrated plant / method for operating an integrated plant allows for stabilization of the operating modes. Operating modes with varying plant workloads can be achieved, in particular, in that the chemical plant has multiple parallel-connected small units that can be individually switched on or off depending on the available flow rate of the available gas. For example, different chemical products can be produced in one or more units.
[0017] For the production of hydrocarbon compounds, such as methanol or higher alcohols, it is necessary to provide a gas mixture consisting essentially of CO and / or CO2 and H2, containing carbon monoxide and / or carbon dioxide and hydrogen components in the correct ratios. The hydrogen source used may be blast furnace gas and / or basic oxygen furnace gas and / or coke oven gas, and additional hydrogen can be produced by converting the CO2 content via the water-gas shift reaction. For example, other hydrogen sources, particularly water electrolysis, are also useful. CO2 can be supplied, for example, using basic oxygen furnace gas. For example, blast furnace top gas and / or basic oxygen furnace gas can be used as a source of CO2.
[0018] In the context of the present invention, a plant for hydrogen recovery means a plant for hydrogen production, in particular a plant for supplying hydrogen, such as a water-gas shift reaction plant, in particular by conversion of CO-containing materials by the water-gas shift reaction (CO+H2O<=>CO2+H2), a plant for hydrogen removal, in particular a hydrogen separation membrane plant, or a combination thereof.
[0019] In a further embodiment of the present invention, the plant for hydrogen recovery is a water gas shift reactor plant and / or a hydrogen separation membrane plant, in particular a hydrogen separation membrane plant connected downstream in the flow direction of the water gas shift reactor plant.
[0020] In a further embodiment of the present invention, the plant for hydrogen recovery further comprises a first plant for CO2 removal, in particular a CO2 scrubber, which is upstream of the hydrogen separation membrane plant in the flow direction and which is connected to the interconnection system by a first CO2 conduit, in particular which is connected to the interconnection system upstream of a mixing device for hydrogen-containing gas heading in the flow direction to the interconnection system.
[0021] In a further embodiment of the invention, the integrated plant further comprises a first CO2 diverter for CO2 obtained in the first plant for CO2 removal, the first CO2 diverter being connected to the first CO2 conduit.
[0022] In a further embodiment of the invention, the integrated plant further comprises at least one controllable gas distribution device, in particular a gas distribution device controllably operable for dividing the blast furnace gas stream supplied to the blast furnace gas conduit system and the interconnection system, in particular a controllable gas distribution device arranged between the blast furnace gas conduit system and the interconnection system. The blast furnace gas stream is preferably divided between the blast furnace gas conduit system and the interconnection system in the gas distribution device so that, after chemically converting the gas stream from the blast furnace gas conduit system in the hydrogen production plant and mixing a hydrogen stream or a hydrogen-containing stream of the produced substance with the gas stream from the interconnection system in a mixing device, a mixed gas is produced with a stoichiometric mixed quotient formed by a dividend, which is the difference between the molar amount of hydrogen as the minuend and the molar amount of carbon dioxide as the subtrahend, and a divisor, which is the sum of the molar amounts of carbon monoxide and carbon dioxide, in the range of 1 to 10, preferably in the range of 1.2 to 6, more preferably in the range of 1.8 to 4, and most preferably in the range of 1.9 to 3.
[0023] In the context of the present invention, a mixing device means a device that mixes gases and / or fluids with each other. More specifically, the mixing device can be selected from the group of a venturi nozzle, a mixing vessel, a mixing station, a static mixer, an ejector, a pipeline T-piece, or a combination thereof.
[0024] In a further embodiment of the invention, the integrated plant further comprises a coke oven plant, the coke oven plant being connected to the interconnection system.
[0025] In a further embodiment of the invention, the integrated plant further comprises a biotechnology plant, which is connected to the interconnection system, in particular connected to the interconnection system in the flow direction downstream of the mixing device for the hydrogen-containing gas.
[0026] In biotechnology plants, biochemical products can be produced from supplied gas streams, each containing components of the final product.
[0027] Biotechnology plants can produce biochemical products from the gas streams they receive, each containing a component of the final product. Biological products can be, for example, alcohols (ethanol, butanol), acetone or organic acids. In particular, biotechnology plants can be fermentation plants or photobiological plants.
[0028] In a further embodiment of the present invention, the integrated plant further comprises a second plant for CO2 removal, in particular a CO2 scrubber, and the blast furnace gas conduit system is connected to the second plant for CO2 removal as an input conduit to the second plant for CO2 removal, and the second CO2 conduit is connected downstream of the blast furnace gas conduit system and / or to the interconnection system as an output conduit from the second plant for CO2 removal, in particular the second CO2 conduit is connected to the interconnection system upstream of a mixing device for hydrogen-containing gas flowing in the flow direction towards the interconnection system.
[0029] In a further embodiment of the invention, the integrated plant further comprises a second CO2 diverter for CO2 obtained in the second plant for CO2 removal, the second CO2 diverter being connected to the second CO2 conduit.
[0030] In a further embodiment of the invention, the integrated plant further comprises at least one plant for blast furnace gas compression, in particular a blast furnace gas compression plant, which plant for blast furnace gas compression is connected to the blast furnace gas conduit system.
[0031] In a further embodiment of the invention, the integrated plant further comprises a plant for blast furnace gas cleaning, in particular a blast furnace gas cleaning plant, wherein at least one plant for blast furnace gas cleaning is connected to the blast furnace gas conduit system.
[0032] In the context of the present invention, a plant for blast furnace gas cleaning means a plant for at least partially separating those components of blast furnace gas that may have a negative impact, in particular on the efficiency of downstream process steps. In particular, blast furnace gas cleaning means a single-stage or multi-stage cleaning operation, in particular by mechanical sorting methods, for example separation selected from the group of density, particle size, particle inertia, surface wettability, magnetizability, electrical mobility, by absorption methods, by catalytic processes or a combination thereof.
[0033] In a further embodiment of the invention, the integrated plant further comprises at least one plant for basic oxygen furnace gas compression, in particular a basic oxygen furnace gas compression plant.
[0034] In a further embodiment of the invention, the integrated plant further comprises a plant for basic oxygen oven gas cleaning, in particular a basic oxygen oven gas cleaning plant.
[0035] In the context of the present invention, a plant for basic oxygen oven gas cleaning means a plant for at least partially separating those components of the basic oxygen oven gas that may have a negative effect, in particular with regard to the efficiency of downstream process steps. In particular, basic oxygen oven gas cleaning means a single-stage or multi-stage cleaning operation, in particular by mechanical sorting methods, for example separation selected from the group of density, particle size, particle inertia, surface wettability, magnetizability, electrical mobility, by absorption methods, by catalytic processes or a combination thereof.
[0036] In a further embodiment of the present invention, the mixing device forms a mixed gas having a stoichiometric mixing quotient formed by a dividend, which is the difference between the molar amount of hydrogen as the minuend and the molar amount of carbon dioxide as the subtrahend, and a divisor, which is the sum of the molar amounts of carbon monoxide and carbon dioxide, in the range of 1 to 10, preferably in the range of 1.2 to 6, more preferably in the range of 1.8 to 4, and most preferably in the range of 1.9 to 3.
[0037] In a further embodiment of the invention, the integrated plant comprises a first plant for CO2 removal, in particular a CO2 scrubber, which is connected in the flow direction upstream of the hydrogen separation membrane plant, which is connected to the interconnection system by a first CO2 conduit, in particular with a first CO2 conduit connected to the interconnection system in the flow direction upstream of a mixing device for hydrogen-containing gas towards the interconnection system, and to a first CO2 diverter for the CO2 obtained in the first plant for CO2 removal, which CO2 diverter is connected to the first CO2 conduit; and / or a second plant for CO2 removal, in particular a CO2 scrubber, to which the blast furnace gas conduit system is connected as an input conduit to the second plant for CO2 removal and as an output conduit from the second plant for CO2 removal, and a second CO2 conduit is connected downstream of the blast furnace gas conduit system and / or to the interconnection system, in particular with the second CO2 conduit connected to the interconnection system upstream of a mixing device for hydrogen-containing gas in the flow direction towards the interconnection system, and to a second CO2 diverter for CO2 obtained in the second plant for CO2 removal, the second CO2 diverter being connected to the second CO2 conduit, The mixing device and / or the first CO2 diverter and / or the second CO2 diverter form a mixed gas for a chemical plant, in particular a mixed gas from an interconnected system, as input to the chemical plant with a CO2 gas stream from which the molar ratio of the molar amount of CO2 obtained in the mixing device and / or the first CO2 diverter and / or the second CO2 diverter is removed in a range of 5 mol% to 45 mol%, preferably in a range of 8 mol% to 40 mol%, more preferably in a range of 15 mol% to 35 mol%, based on the molar amounts of CO2 and CO obtained from a blast furnace, in particular in pig iron production.
[0038] The invention will now be explained by means of drawings which are purely exemplary and which are shown in schematic form. [Brief explanation of the drawings]
[0039] [Figure 1] 1 is a highly simplified block diagram of an integrated plant of the present invention for steel production (dashed elements are optional embodiments).
[0040] FIG. 1 shows an integrated plant 1 for steel production according to one embodiment of the present invention, comprising a blast furnace 2 for pig iron production, a basic oxygen furnace steel plant 3 for crude steel production, a blast furnace gas conduit system 4 for gases obtained in pig iron production, an interconnection system 5 for gases obtained in pig iron production and / or crude steel production, a plant 6 for hydrogen recovery, and a chemical plant 7. The chemical plant 7 is connected to the interconnection system 5. A hydrogen conduit 8 for hydrogen-containing gases obtained in hydrogen recovery is connected to the interconnection system 5 upstream of the chemical plant 7 in the flow direction. A mixing device 9 for hydrogen-containing gases obtained in hydrogen recovery and gases obtained in pig iron production and / or crude steel production is arranged downstream of the plant 6 for hydrogen recovery and upstream of the chemical plant 7 in the flow direction. The blast furnace gas conduit system 4 is connected to the plant 6 for hydrogen recovery as an input conduit to the plant 6 for hydrogen recovery, and the hydrogen conduit 8 is connected to the plant 6 for hydrogen recovery as an output conduit from the plant 6 for hydrogen recovery.
[0041] The plants 6 for hydrogen recovery are shown as water gas shift reaction plant 10 and hydrogen separation membrane plants 11, 11'.
[0042] A first plant 12 for CO2 removal is connected upstream of the hydrogen separation membrane plants 11, 11' in the flow direction, and the first plant 12 for CO2 removal is connected to the interconnection system 5 by a first CO2 conduit 13.
[0043] A first CO2 diverter 14 for the CO2 obtained in the CO2 removal 12 is connected to the first CO2 conduit 13.
[0044] A controllable gas distribution device 15 for dividing the blast furnace gas flow fed to the blast furnace gas conduit system 4 and the interconnection system 5 is arranged between the blast furnace gas conduit system 4 and the interconnection system 5 .
[0045] The coke oven plant 16 is connected to the interconnection system 5 .
[0046] Downstream of the mixing device 9 for the hydrogen-containing gas in the flow direction towards the interconnection system 5 , a biotechnology plant 17 is connected to the interconnection system 5 .
[0047] The blast furnace gas conduit system 4 is connected to a second plant 18 for CO2 removal as an input conduit to the second plant 18 for CO2 removal.
[0048] As an output conduit from the second plant 18 for CO2 removal, a second CO2 conduit 19 is connected downstream of the blast furnace gas conduit system 4 and to the interconnection system 5.
[0049] A second CO2 diverter 20 for the CO2 obtained in the second CO2 removal 18 is connected to a second CO2 conduit 19.
[0050] A plant 21 for blast furnace gas compression is connected to the blast furnace gas pipeline system 4 .
[0051] A plant 22 for blast furnace gas cleaning is connected to the blast furnace gas pipeline system 4 .
[0052] A plant 23 for compressing basic oxygen furnace gas and a plant 24 for cleaning basic oxygen furnace gas are connected to an interconnection system 5 downstream in the flow direction of the basic oxygen furnace steel plant 3 for crude steel production.
[0053] Industrial Applicability The integrated plant for steel production and the method for operating an integrated plant of the type described above can be used for the production of steel. [Explanation of symbols]
[0054] 1=Integrated Plant 2=blast furnace 3=Basic oxygen furnace steel plant 4=Blast furnace gas pipeline system 5=Interconnected Systems 6=Plant for hydrogen recovery 7=Chemical Plant 8=Hydrogen conduit 9=Mixing device 10=Water gas shift reactor plant 11, 11' = Hydrogen separation membrane plant 12 = First plant for CO2 removal 13 = First CO2 Conduit 14 = First CO2 Diverter 15=Controllable gas distribution device 16=Coke Oven Plant 17=Biotechnology Plant 18 = Second plant for CO2 removal 19 = Second CO2 conduit 20 = Second CO2 Diverter 21=Plant for blast furnace gas compression 22=Plant for cleaning blast furnace gas 23=Plant for compression of basic oxygen furnace gases 24=Plant for basic oxygen furnace gas cleaning BFG = Blast Furnace Gas KVG = Basic Oxygen Furnace Gas KOG = coke oven gas ____=Required element ------=Optional element _.._ = Reference line for reference symbol
Claims
1. An integrated plant (1) for steel production, comprising: Blast furnaces (2) for the production of pig iron; a basic oxygen furnace steel plant (3) for crude steel production; a blast furnace gas pipeline system (4) for gases obtained in pig iron production; an interconnection system (5) for gases obtained in pig iron production and / or crude steel production; a plant (6) for hydrogen recovery, a chemical plant (7) connected to the interconnection system (5); a hydrogen conduit (8) for hydrogen-containing gas obtained in hydrogen recovery, said hydrogen conduit (8) being connected to said interconnection system (5) upstream of said chemical plant (7) in the flow direction; a mixing device (9) for hydrogen-containing gas obtained in hydrogen recovery and gas obtained in pig iron production and / or crude steel production, the mixing device (9) being arranged downstream of the plant for hydrogen recovery (6) and upstream of the chemical plant (7) in the flow direction, wherein the blast furnace gas conduit system (4) is connected to the plant for hydrogen recovery (6) as an input conduit to the plant for hydrogen recovery (6), and the hydrogen conduit (8) is connected to the plant for hydrogen recovery (6) as an output conduit from the plant for hydrogen recovery (6).
2. 2. The integrated plant (1) according to claim 1, characterized in that the plant (6) for hydrogen recovery is a water-gas shift reaction plant (10) and / or a hydrogen separation membrane plant (11, 11'), in particular having the hydrogen separation membrane plant (11, 11') downstream of the water-gas shift reaction plant (10) in the flow direction.
3. The plant (6) for hydrogen recovery is ２ a first plant (12) for the removal of CO ２ A first plant (12) for removal is upstream of the hydrogen separation membrane plant (11, 11') in the flow direction, and the CO ２ The first plant (12) for removal of the first CO ２ is connected to said interconnection system (5) by a conduit (13), in particular said first CO ２ 3. An integrated plant (1) according to claim 2, characterized in that a conduit (13) is connected to the interconnection system (5) upstream of the mixing device (9) for hydrogen-containing gases heading in flow direction towards the interconnection system (5).
4. The integrated plant (1) ２ CO obtained in the first plant (12) for removal ２ First CO for ２ A diverter (14) is further provided, and the first CO ２ A diverter (14) is provided to ２ 4. An integrated plant (1) according to claim 3, characterized in that it is connected to a conduit (13).
5. 5. The integrated plant (1) according to claim 1, further comprising at least one controllable gas distribution device (15) for dividing the blast furnace gas flow fed to the blast furnace gas conduit system (4) and the interconnection system (5), in particular the controllable gas distribution device (15) being arranged between the blast furnace gas conduit system (4) and the interconnection system (5).
6. The integrated plant (1) ２ and a second plant (18) for the removal of said CO ２ as an input conduit to a second plant (18) for removal of CO ２ connected to a second plant (18) for removal of a second CO ２ The conduit (19) ２ downstream of the blast furnace gas conduit system (4) and / or connected to the interconnection system (5) as an output conduit from the second plant (18) for removal, in particular the second CO ２ 6. An integrated plant (1) according to any one of claims 1 to 5, characterized in that a conduit (19) is connected to the interconnection system (5) upstream of the mixing device (9) for hydrogen-containing gases heading towards the interconnection system (5) in flow direction.
7. The integrated plant (1) ２ CO obtained in a second plant (19) for removal ２ Second CO for ２ A diverter (20) is further provided, and the second CO ２ A diverter (20) ２ 7. An integrated plant (1) according to claim 6, characterized in that it is connected to a conduit (19).
8. A method for operating an integrated plant (1) for steel production, comprising a blast furnace (2) for pig iron production, a basic oxygen furnace steel plant (3) for crude steel production, a blast furnace gas conduit system (4) for gases obtained in pig iron production, an interconnection system (5) for gases obtained in pig iron production and / or crude steel production, a plant (6) for hydrogen recovery, a chemical plant (7) connected to the interconnection system (5), and a hydrogen conduit (8) for hydrogen-containing gases obtained in hydrogen recovery, the interconnection system (5) being connected upstream of the chemical plant (7) in the flow direction. ), and a mixing device (9) for hydrogen-containing gas obtained in hydrogen recovery and gas obtained in pig iron production and / or crude steel production, the mixing device (9) being downstream of the plant for hydrogen recovery (6) and upstream of the chemical plant (7) in the flow direction, wherein the blast furnace gas conduit system (4) is connected to the plant for hydrogen recovery (6) as an input conduit to the plant for hydrogen recovery (6), and the hydrogen conduit (8) is connected to the plant for hydrogen recovery (6) as an output conduit from the plant for hydrogen recovery (6), The method of claim 1, wherein the mixing device (9) forms a mixed gas having a stoichiometric mixture quotient formed by a dividend that is the difference between the molar amount of hydrogen, which is the minuend, and the molar amount of carbon dioxide, which is the subtrahend, and a divisor that is the sum of the molar amounts of carbon monoxide and carbon dioxide.
9. 9. The method according to claim 8, characterized in that the mixing device (9) forms a mixed gas having a stoichiometric mixing quotient formed by a dividend, which is the difference between the molar amount of hydrogen as the minuend and the molar amount of carbon dioxide as the subtrahend, and a divisor, which is the sum of the molar amounts of carbon monoxide and carbon dioxide, in the range of 1 to 10, preferably in the range of 1.2 to 6, more preferably in the range of 1.8 to 4, and most preferably in the range of 1.9 to 3.
10. 10. A method for operating an integrated plant (1) according to any of claims 8 and 9, wherein the integrated plant (1) further comprises: CO ２ A first plant (12) for the removal of said CO ２ The first plant (12) for removal is connected in the flow direction upstream of the hydrogen separation membrane plant (11, 11'), and ２ The first plant (12) for removal is in particular a first CO ２ A conduit (13) connects the interconnection system (5) and the CO 2 gas upstream of the mixing device (9) for hydrogen-containing gas flowing towards the interconnection system (5). ２ CO obtained in the first plant (12) for removal ２ First CO for ２ The first CO ２ connected to the interconnection system (5) by a conduit (13), ２ The diverter (14) is ２ The CO ２ a first plant (12) for removal, and / or CO ２ A second plant (18) for the removal of CO ２ as an input conduit to a second plant (18) for removal of CO ２ as an output conduit from the second plant (18) for removal of said CO ２ connected to a second plant (18) for removal of a second CO ２ The conduit (19) is particularly ２ A conduit (19) is connected to the interconnection system (5) and the CO 2 gas supply system (6) upstream of the mixing device (9) for hydrogen-containing gas flowing towards the interconnection system (5). ２ CO obtained in a second plant (19) for removal ２ Second CO for ２ a second CO ２ The diverter is the second CO ２ The CO ２ a second plant (18) for removal, The mixing device (9) and / or the first CO ２ Diverter (14) and / or said second CO ２ A diverter (20) is provided to the mixing device (9) and / or the first CO ２ Diverter (14) and / or said second CO ２ CO obtained in the diverter (20) ２ and in particular, the CO obtained from the blast furnace (2) in the production of pig iron, in a molar ratio of ２ and a removed CO in the range of 5 mol% to 45 mol%, preferably in the range of 8 mol% to 40 mol%, more preferably in the range of 15 mol% to 35 mol%, based on the molar amount of CO ２ 1. A method according to claim 1, characterized in that the gas stream forms a gas mixture for a chemical plant (7).