Process and plant for the treatment of an oxygen gas and process and metallurgical plant for the treatment of a metallic material

Abstract

The present application relates to a method and a plant (10) for processing an oxygen gas which is produced by electrolysis of water and / or steam and is used as an oxidizing agent in a metallurgical facility (1), wherein the oxygen gas produced by electrolysis is subjected to at least one drying step, via which the accompanying gases hydrogen and water contained in the oxygen gas are removed, preferably quantitatively.

Description

The present invention relates to a method and to a plant for processing an oxygen gas which is produced by means of electrolysis of water and / or water vapor and is used as oxidizing agent in a metallurgical plant. In a further aspect, the present invention additionally relates to a method and a metallurgical device for treating at least one metallic material selected from steel, iron, at least one iron alloy, a nonmetal or a nonmetal alloy in a metallurgical device, comprising at least one step in which hydrogen gas and oxygen gas are generated by means of electrolysis of water and / or water vapor, and wherein both the hydrogen gas generated by electrolysis and the oxygen gas generated by electrolysis are used in at least one treatment step of the method.The generation of hydrogen by electrolysis forms a module for a lasting and climate-neutral energy management in the metallurgical industry. The hydrogen is advantageously produced here with green electricity from renewable energies, for example from wind power, solar installations, water power or biogas installations, and can therefore also be referred to as green hydrogen.In the production of this green hydrogen, oxygen is also produced in high amounts. This oxygen, which is also referred to as "green" oxygen, can be used or used as industrial gas in industrial facilities, both within the known iron and steel routes and for the production of ferroalloys and in the non-ferro industry (non-ferrous metals) for numerous tasks in the required processes, whereby an efficiency increase of the hydrogen electrolysis takes place by simultaneous use of the oxygen produced.Various approaches are already known from the prior art.Thus, WO 2011 / 116141 A2 describes a system for producing steel using renewable energies, wherein firstly water vapor is generated by means of a heat exchanger, from which water vapor hydrogen and oxygen are subsequently generated by means of a hydrogen generator and provided to a steel hut.EP 3425070 B1 discloses a further method for operating an iron production plant, in which the oxygen and hydrogen required for the converter process are produced electrolytically.A further method for utilizing oxygen-containing gas arising from water electrolysis in the case of iron and / or steel production from oxidic iron carriers is known from EP 3 736 347 A1.A further method for producing steel with regenerative energy is also known from EP 2895631 B1. In this case, iron ore is first reduced with hydrogen, the intermediate product obtained then being processed further metallurgically. The hydrogen is produced electrolytically using regenerative energies.DE 10 2022 201 918 A1 discloses a metallurgical production plant and a method for operating the same, having an electrolysis device for generating hydrogen from supplied hydrogen and current, having a hydrogen storage, a pipeline network located on a plant site and various consumers within the metallurgical production plant, wherein the production plant comprises a fuel cell, by means of which current is generated from the stored hydrogen, such that electrical energy produced in an environmentally friendly manner can be made available to the consumers.Furthermore, WO 2015 / 074780 A1 describes a method for metallurgical treatment of a carbon-containing metal melt in the context of a production process by means of a process gas introduced onto or into the metal melt, wherein carbon dioxide (CO2) is blown in and, with the progress of the endothermic Boudourad reaction, is at least partially converted with dissolved carbon present in the metal melt to carbon monoxide (CO) as product gas.Air separation plants or air separation plants are also known from the prior art. In these, the ambient air is separated into its main constituents nitrogen and oxygen. The oxygen obtained in this case can be made available to a metallurgical production plant via tank trucks as liquid oxygen or via pipelines, preferably as gaseous oxygen. However, no hydrogen is produced in these plants.Against this background, the object of the present invention is to provide a method for processing an oxygen gas which is improved compared to the prior art and is produced by means of electrolysis of water and / or water vapor and is used as oxidizing agent in a metallurgical installation, and a method for treating at least one metallic material in a metallurgical installation which is improved compared to the prior art.In a further aspect, the object of the present invention is to provide a plant for processing an oxygen gas which is improved compared to the prior art and is produced by means of electrolysis of water and / or water vapor and is used as oxidizing agent in a metallurgical device, and a metallurgical device for treating at least one metallic material which is improved compared to the prior art.DESCRIPTION OF THE INVENTIONThe solution of the aforementioned objects provides, according to a first aspect, a method for processing an oxygen gas with the features of claim 1 and, according to a further aspect, a system for processing an oxygen gas with the features of claim 12.According to the invention, it is provided that, in the method for processing an oxygen gas which is generated by means of electrolysis of water and / or water vapor and is used as oxidizing agent in a metallurgical plant, the oxygen gas generated by means of the electrolysis is subjected to at least one drying step, via which the accompanying gases hydrogen and water contained in the oxygen gas are removed, preferably quantitatively.In the same way, it is provided according to the invention that the plant used for processing an oxygen gas which is generated by means of electrolysis of water and / or water vapor and is used as oxidizing agent in a metallurgical plant comprises a drying device, via which the accompanying gases hydrogen and water contained in the oxygen gas can be removed, preferably quantitatively.When analyzing an oxygen gas generated in this way, it has surprisingly been found that it comprises an appreciable proportion of hydrogen, which has a disadvantageous effect on the further process, since the hydrogen can react with the oxygen to form water in the further process and thus would again form an interfering water content in the oxygen gas. In contrast to the methods known from the prior art, according to the invention, the hydrogen is therefore also removed from the oxygen gas, preferably quantitatively, in addition to the water, before the oxygen gas is then used as oxidizing agent in the metallurgical plant.Further advantageous embodiments of the invention are specified in the dependent claims. The features listed individually in the dependent claims can be combined with one another in a technically expedient manner and can define further embodiments of the invention. In addition, the features specified in the claims are more precisely described and explained in the description, further preferred embodiments of the invention being presented.The term drying is understood in the sense of the present invention to mean that the accompanying gases water, in the form of water vapor, and hydrogen are quantitatively removed from the oxygen gas.The term iron alloy or "ferroalloy" generally refers to iron alloys containing a high proportion of one or more elements other than carbon, for example, ferrochrome, ferromangan, ferronickel and ferrosilicon.The term non-ferrous metals is understood in the sense of the present invention to mean metals and alloys which do not contain iron, such as aluminum, magnesium, copper, lead, nickel, tin, titanium and zinc, as well as copper alloys such as brass and bronze.Preferably, the drying step comprises at least one (first) substep by means of which the hydrogen is removed from the oxygen gas by a catalytic oxidation process. By such a gas purification method, a hydrogen impurity content of up to 5 vol% can be reduced to a residual content of below 1 ppmv, thereby obtaining a nearly hydrogen-free oxygen gas.The catalytic oxidation process is preferably carried out on palladium or platinum catalysts, the hydrogen impurities then being oxidized again to water with the oxygen of the oxygen gas. The water formed in this case can then be removed in a subsequent process step. Therefore, in this context, it is particularly preferably provided that the drying step comprises at least one (second) substep, by means of which the water is removed or separated from the oxygen gas by cooling, condensation and / or drying, whereby a virtually hydrogen- and water-free oxygen gas is obtained as the end result.The term "virtually hydrogen- and water-free oxygen gas" is understood to mean that it has a negligible residual content of hydrogen and water of in each case less than 1 ppmv.From the plant perspective, it is preferably provided that the drying device comprises at least one (first) device, particularly preferably a catalytic oxidation device, for removing hydrogen and / or at least one (second) device, in particular an intercooler and / or a steam trap and / or an absorption dryer, for removing water from the oxygen gas. If appropriate, the drying device can additionally have an adsorption stage via which the oxygen gas is postdried in a third substep.A preferred development of the method according to the invention provides that the hydrogen content and / or the water content in the oxygen is measured before, after and / or during the drying step. For this purpose, at least one measuring device is preferably used for measuring the oxygen content, the water content and / or the hydrogen content or optionally the content of other foreign gases or impurities in the oxygen. By means of such a measuring device, undesired impurities of the oxygen gas can be detected, so that the degree of impurities can be monitored at any point in time of the process.According to a preferred development of the method according to the invention, the dried oxygen gas, which preferably has an oxygen content of at least 99% by volume, more preferably an oxygen content of at least 99.1% by volume, even more preferably an oxygen content of at least 99.3% by volume, is subjected to at least one conditioning step in which dried air, and / or a process gas selected from the group comprising carbon dioxide, carbon monoxide, methane and / or natural gas, and / or an inert gas selected from the group comprising nitrogen and / or argon, is added to the said conditioning step.For this purpose, the plant according to the invention can preferably comprise at least one conditioning device, via which the dried oxygen gas is miscible with the dried air, and / or a process gas selected from the group comprising carbon dioxide, carbon monoxide, methane and / or natural gas, and / or an inert gas selected from the group comprising nitrogen and / or argon.The use of carbon dioxide and / or carbon monoxide provides an economic alternative to the use of pure oxygen, nitrogen or argon, especially in steel making. At a temperature above 1000° C., for example, carbon dioxide in contact with carbon in the melt initiates a decarburization process with an endothermic effect derived from the progress of the Boudourad reaction, after which carbon dioxide (CO 2) is reacted with carbon to carbon monoxide. The process gas carbon monoxide takes up twice the volume in comparison with the carbon dioxide volume introduced or injected into the melt used as reaction gas and thereby increases the mixing of the melt.The content of CO or CO 2, which is added to the oxygen gas, can vary over wide ranges in the above-mentioned preferred variant depending on the application. Thus, the content of CO or CO 2 in the oxygen gas may be from 0.01 vol % (99.9 vol % oxygen) to 50 vol %.Instead of or in addition to the admixture of CO and / or CO 2 further foreign gases can be admixed to the treatment gas in defined amounts in order to promote or suppress certain chemical reactions in the treatment step in the metallurgical process and / or to vary the properties of the metallurgical product to be produced in a targeted manner.According to a particularly advantageous embodiment variant, the metallurgical device comprises a BOF converter, wherein the dried oxygen gas is then mixed with nitrogen and / or argon in the course of the oxygen blowing process. An admixture of nitrogen and / or argon of up to 50% by volume has proven particularly advantageous here, since the partial pressure reduction on the one hand reduces the process times and on the other hand makes it possible to achieve low carbon contents for a steel to be produced.According to a particularly advantageous embodiment variant, the metallurgical device comprises an AOD converter, wherein the dried oxygen gas is then mixed with nitrogen and / or argon in the course of the oxygen blowing process. In the case of an AOD converter, an admixture of nitrogen and / or argon of at least 10% by volume has proven to be particularly advantageous in order to obtain the required impact impulse during the blowing process.According to a further advantageous embodiment variant of the method, the dried oxygen gas can be temporarily stored in a storage device, preferably before the conditioning step, and can then be adjusted in the downstream pressure regulating unit to a pressure in the metallurgical plant, preferably to a pressure specific for the BOF or AOD converter, for example to a pressure of 18 to 21 bar.For this purpose, the system preferably comprises at least one storage device, particularly preferably arranged upstream of the conditioning device, and at least one pressure regulating unit connected downstream of the storage device.Furthermore, it is preferably provided that the dried oxygen gas, preferably before the conditioning step, is subjected to at least one cleaning step, via which particulate constituents, for example those which are larger than 250 micrometers and contaminate the oxygen gas, are removed therefrom. The at least one cleaning device, preferably arranged upstream of the conditioning device, is particularly preferably arranged between a pressure regulating unit and the conditioning device.There are various types of water electrolysers in which, for example, a plurality of electrolysis cells are arranged in series. In addition to the electrolyte used, they also differ in the structure of the cells in detail (for example the membrane, the gas diffusion layer, the type of bipolar plates and the catalysts) and in the temperatures and pressures prevailing during the electrolysis. In all known electrolysers, two hydrogen molecules and one oxygen molecule are formed using direct current from two water molecules. The following variants of water electrolysers are known, for example:AEL (alkaline electrolyser)PEM (Proton Exchange Membrane)SOE (Solid Oxide Electrolysis)AEM (Anion Exchange Membrane)According to a preferred development of the method according to the invention, the oxygen and hydrogen gases can be produced electrolytically by alkali electrolysis, PEM electrolysis or SOE electrolysis.In a further aspect, the present invention relates to a method for treating at least one metallic material selected from steel, iron, at least one iron alloy, a nonmetal or a nonmetal alloy in a metallurgical installation, wherein at least one step is carried out in which hydrogen gas and oxygen gas are first produced by electrolysis of water and / or water vapor, and wherein both the hydrogen gas produced by electrolysis and the oxygen gas produced by electrolysis are used in at least one further treatment step, wherein the oxygen gas is first prepared by the method according to the invention before use in the metallurgical installation.In a further aspect, the present invention additionally relates to a metallurgical device for treating at least one metallic material selected from steel, iron, at least one iron alloy, a nonmetal or a nonmetal alloy, comprising at least one electrolysis device by means of which hydrogen gas and oxygen gas can be produced electrolytically from water, and at least one treatment device in which the hydrogen and oxygen gas produced by electrolysis can be used for treating the product, wherein it is further provided according to the invention that the metallurgical device comprises the plant according to the invention in which the oxygen gas can first be processed before use in the metallurgical device.According to a preferred variant of the method according to the invention, it is also possible, for example, for a partial volume of the oxygen generated by electrolysis to be fed to at least one consumer in the area of the metallurgical plant, independently of the treatment step. This procedure is appropriate if appropriate metallurgical or other devices are located on the site of the plant or in the vicinity thereof, which require oxygen-for example for oxidation processes, for heating up or promoting combustion processes or similar oxygen. In this way, the energy balance and the CO 2- balance in the overall process are improved, since no oxygen has to be supplied from outside the system, which has been prepared in a complicated manner by air separation, even for the supply of these consumers. Rather, the oxygen required here is also obtained electrolytically by using regenerative energy and is thus made available to the consumer(s) as "green" oxygen.In the aforementioned variant of the method according to the invention, oxygen is preferably supplied to the consumer in a production quantity of at least about 10 Nm 3 / h.Furthermore, the inventive metallurgical device can comprise a pipeline network for conducting the processed oxygen, optionally from a storage device, to at least one consumer.According to a preferred development of the present invention, the metallurgical plant comprises at least one treatment device selected from an oxygen blow converter, an electric arc furnace, a secondary metallurgical treatment device, in particular a ladle degassing or a vacuum treatment for degassing, a continuous casting plant, a torch cutting plant, an oxygen torch lance and an oxygen injector.Examples of metallurgical equipment in which an oxygen which may be produced "green" can be used are blast furnaces, direct reduction plants, converters such as BOF or AOD converters, electric arc furnaces, vacuum plants, RH plants, water treatment and clarification plants, non-iron plants, hydro- and pyrometallurgical plants, for example for the recycling of electric scrap and copper, plants for the production of ferroalloys and plants for the production of silicon.Some examples of use for metallurgical equipment are listed below, in which the oxygen gas prepared according to the invention can be used advantageously. These are, for example,a) Oxygen Blowing ConverterAn oxygen blow converter is a central plant in primary steel making, where pig iron is made into steel using oxygen. For this purpose, the liquid pig iron is introduced into the oxygen blow converter. Pig iron still contains undesirable accompanying elements such as carbon, silicon, sulfur and phosphorus. Oxygen is added via a water-cooled lance, as a result of which the accompanying elements combust. This process of inflation is referred to in the technical language "refresh". Oxygen blow converters can hold up to, for example, 400 tons of raw steel. The actual refining process takes about 20 minutes, for example. In addition to the pure blowing of oxygen, nowadays it is usually also the case that combined blowing through the tray with inert gases such as nitrogen or argon is used for flushing. For example, in an oxygen blow converter, about 40-50 Nm 3 of oxygen per ton of steel with a pressure of at least 10 bar is required for production per ton of steel. In this refining process, according to the invention, the oxygen gas, which has been processed and optionally previously produced electrolytically by means of regenerative energy, can be used advantageously.b) Electric arc furnacesElectric arc furnaces (also EAF) are industrial furnaces which are used, inter alia, for melting and casting metals. Once the steel has been fused, the melt is decarburized with the aid of oxygen. This means that the introduced oxygen binds carbon and other undesirable chemical components and a foamed slag is formed. The furnace vessel itself is usually made up of three parts, a bottom vessel, a top vessel and a lid and can be tilted hydraulically. In various embodiments, corresponding oxygen injectors are installed. In this process, too, according to the invention, the oxygen gas which has been processed and, if appropriate, previously produced by means of regenerative energy can be advantageously used.c) Secondary metallurgical treatment (for example VD, VOD and RH equipment)In the case of ladle degassing (vacuum degassing) VD and in the case of vacuum oxygen decarburization (VOD), a melting ladle is exposed to a vacuum in a hermetically sealed vessel. The Rührstoff-Heraeus (RH) method is a method of secondary metallurgy in which the liquid metal is subjected to vacuum treatment for degassing. In these processes, large amounts of oxygen are likewise used, inter alia, for decarburization, chemical heating, refining, preheating of the vessels and for various firing tasks. In the processes mentioned, according to the invention, the oxygen gas which has been processed and, if appropriate, previously produced by means of regenerative energy can be advantageously used.d) Continuous casting plantsFor dividing the hot strand behind a continuous casting plant, combustion cutting plants are used. The prior art here is details of so-called oxygen torch cutting, see here, for example, EP 0392043 A1. For the rapid, safe and economical subdivision of strands moving at the casting speed, a continuous casting plant is equipped with an oxygen torch cutting machine, in which a special burner arrangement is used. In this process of torch cutting, according to the invention, the oxygen gas which has been prepared and optionally previously produced electrolytically by means of regenerative energy can likewise be used advantageously.(e) Equipment for the production of non-ferrous products, ferroalloys and production equipment for copper recycling (hydro- and pyro-metallurgical processes)Here, oxygen combustion lances are preferably used for opening tap holes and / or pans. In addition, oxygen injectors are used in the installations for specific process applications. In this process of injecting oxygen, according to the invention, the oxygen gas which has been processed and, if appropriate, previously produced by means of regenerative energy can also be advantageously used.The generation of the required green current for the production of "green" oxygen from renewable energies by electrolysis of water can be effected within the scope of the present invention either on the plant site on which the metallurgical equipment is located or outside this plant site.FiqurenbezeichnunqThe invention and the technical field are explained in more detail below with reference to the figures. It should be noted that the invention is not intended to be limited by the exemplary embodiments shown. In particular, unless explicitly stated otherwise, it is also possible to extract partial aspects of the facts explained in the figures and combine them with other components and findings from the present description and / or figures. In particular, it should be pointed out that the figures and in particular the size relationships illustrated are only schematic. Identical reference numerals designate identical objects, so that explanations from other figures can be used additionally if appropriate. The following are shown: FIG. 1 is a variant of an oxygen gas treatment plant forming part of a metallurgical plant.The variant embodiment of the metallurgical plant 1 shown purely schematically in FIG. 1 comprises an electrolyser 2, which is advantageously operated by means of regeneratively generated current, so that the oxygen produced as a result is a so-called green oxygen. In order that the oxygen gas generated by means of electrolysis of water and / or water vapor can be used as oxidizing agent in a converter 3, this must first be dried because of the disruptive accompanying gases hydrogen and water. For this purpose, the device 1 comprises a drying device 4, which comprises a catalytic oxidation device for removing hydrogen and a steam trap connected downstream of the oxidation device for removing the water from the oxygen gas. In the present embodiment variant, the drying device 4 is then followed by a storage device 5 and a pressure regulating unit 6. By means of the latter, the pressure of the oxygen gas is adjusted to a pressure of 18-21 bar specific to the metallurgical process. The oxygen gas, which is then dried and reduced to the working pressure, is filtered via a cleaning device 7 connected downstream of the pressure control unit 6 in order to remove particulate constituents greater than 250 μm, before the latter is fed to a conditioning device 8. In this, the dried oxygen gas can be mixed with dried air, and / or a process gas selected from the group comprising carbon dioxide, carbon monoxide, methane and / or natural gas, and / or an inert gas selected from the group comprising nitrogen and / or argon, before it is then fed to the converter 3.Reference numerals denote reference numerals1 The invention relates to a device for treating oxygen gas comprising a device for treating oxygen gas comprising a device for treating oxygen gas comprising an electrolyser 3 a converter 4 a drying device 5 a storage device 6 a pressure regulating unit 7 a cleaning device 8 a conditioning device 9 a reservoir 10 a plant for treating an oxygen gasReferences included in the specificationThis list of documents cited by the applicant has been produced in an automated manner and is only included for the better information of the reader. The list is not part of the German patent application or utility model application. The DPMA does not take any adhesion for any faults or omissions.Patent Literature citedWO 2011 / 116141 A2

[0005] EP 3425070 B1

[0006] EP 3 736 347 A1

[0007] EP 2895631 B1

[0008] DE 10 2022 201 918 A1

[0009] WO 2015 / 074780 A1

[0010] EP 0392043 A1

[0050]

Claims

Method for processing an oxygen gas which is generated by means of electrolysis of water and / or water vapor and is used as oxidizing agent in a metallurgical plant (1), wherein the oxygen gas generated by means of the electrolysis is subjected to at least one drying step, via which the accompanying gases hydrogen and water contained in the oxygen gas are removed, preferably quantitatively.The method according to claim 1, wherein the drying step comprises at least one (first) substep by means of which the hydrogen is removed from the oxygen gas by a catalytic oxidation process.Method according to claim 1 or 2, wherein the drying step comprises at least one (second) substep, by means of which the water is removed from the oxygen gas by cooling, condensation and / or drying.Method according to any of the preceding claims, wherein the hydrogen content and / or the water content in the oxygen gas is measured before, after and / or during the drying step.The method according to any one of the preceding claims, wherein the dried oxygen gas, which preferably has an oxygen content of at least 99 vol.%, preferably an oxygen content of at least 99.1 vol.%, particularly preferably an oxygen content of at least 99.3 vol.%, is subjected to at least one conditioning step in which dried air, and / or a process gas selected from the group comprising carbon dioxide, carbon monoxide, methane and / or natural gas, and / or an inert gas selected from the group comprising nitrogen and / or argon, is added.Method according to one of the preceding claims, wherein the dried oxygen gas is temporarily stored in a storage device (5), preferably before the conditioning step, and is adjusted to a pressure specific in the metallurgical plant (1) in a downstream pressure control unit (6).The method according to any one of the preceding claims, wherein the dried oxygen gas is subjected, preferably before the conditioning step, to at least one cleaning step, via which particulate constituents are removed therefrom.The method according to any one of the preceding claims, wherein the electrolytic production of the oxygen and the hydrogen gas is effected by alkali electrolysis, PEM electrolysis or SOE electrolysis.Method for treating at least one metallic material selected from steel, iron, at least one iron alloy, a nonmetal or a nonmetal alloy in a metallurgical installation (1), comprising at least one step in which hydrogen gas and oxygen gas are generated by means of electrolysis of water and / or water vapor, and wherein both the hydrogen gas generated by electrolysis and the oxygen gas generated by electrolysis are used in at least one treatment step of the method, wherein the oxygen gas is first treated according to a method according to one of the preceding claims before use in the metallurgical installation (1).Method according to claim 9, wherein a partial volume flow of the oxygen gas generated by electrolysis is supplied to at least one consumer in the area of the metallurgical plant (1) independently of the treatment process.The method of claim 10, wherein the oxygen gas is supplied to the load in a production amount of at least 10 Nm 3 / hr.Plant (10) for preparing an oxygen gas which is generated by means of electrolysis of water and / or water vapor and is used as oxidizing agent in a metallurgical plant (1), wherein this plant comprises a drying plant (4) via which the accompanying gases hydrogen and water contained in the oxygen gas can be removed.Plant (10) according to claim 12, wherein the drying device (4) comprises at least one (first) device, preferably a catalytic oxidation device, for removing hydrogen and / or at least one (second) device, in particular an intercooler and / or a steam trap and / or an absorption dryer, for removing water from the oxygen gas.Plant (10) according to claim 12 or 13, wherein said plant has at least one measuring device for measuring the oxygen content, the water content and / or the hydrogen content.The plant (10) according to any one of the preceding claims 12 to 14, further comprising at least one conditioning device (8) via which the dried oxygen gas is miscible with dried air, and / or a process gas selected from the group comprising carbon dioxide, carbon monoxide, methane and / or natural gas, and / or an inert gas selected from the group comprising nitrogen and / or argon.Plant (10) according to one of the preceding claims 12 to 15, further comprising at least one storage device (5) preferably arranged upstream of the conditioning device (8) and at least one pressure regulating unit (6) connected downstream of the storage device (5).Plant (10) according to one of the preceding claims 12 to 16, further comprising at least one cleaning device (7) preferably arranged upstream of the conditioning device (8).A metallurgical device (1) for treating at least one metallic material selected from steel, iron, at least one iron alloy, a non-metal or a non-metal alloy, comprising at least one electrolysis device (2) by means of which hydrogen gas and oxygen gas can be produced electrolytically from water, and at least one treatment device (3) in which the hydrogen and oxygen gas produced by electrolysis can be used for treating the product, wherein said device further comprises a plant (10) according to one of the preceding claims 12 to 17, in which the oxygen gas can first be processed before use in the metallurgical device (1).The metallurgical plant (1) according to claim 18, wherein it further comprises a piping network for guiding the processed oxygen gas to at least one consumer.Metallurgical plant (1) according to claim 18 or 19, wherein it comprises at least one treatment device (3) selected from an oxygen blow converter, an electric arc furnace, a secondary metallurgical treatment device, in particular a ladle degassing or a vacuum treatment for degassing, a continuous casting plant, a torch cutting plant, an oxygen torch lance or an oxygen injector.

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