System and process for co-production of steel and dihydrogen

Abstract

Coupling of a metallurgical installation (2) and a dihydrogen production installation (3) for transferring (4) heat produced by the metallurgical installation (2) to an input flow of an electrochemical device of the dihydrogen production installation (3) and / or for conveying (100) to the metallurgical installation (2) one or more fluids formed by the electrochemical device. Figure for abstract: Fig. 7

Description

Title of the invention: System and method for co-production of steel and dihydrogen Technical field

[0001] The present invention relates to the fields of metallurgy and the production of dihydrogen.

[0002] The invention is of particular interest, in no way limiting, for the production of dihydrogen by vapor phase electrolysis.

[0003] The invention also presents a particular interest, in no way limiting, for the production of steel. State of the art

[0004] Conventional industrial production techniques for steel on the one hand and dihydrogen on the other have an ecological impact that should be reduced.

[0005] The present invention aims to reduce such an impact in the field of dihydrogen production and / or in the field of metallurgy.

[0006] A particular, non-limiting aim of the invention is to reduce the energy consumption of a conventional hydrogen production installation.

[0007] Another particular, non-limiting aim of the invention is to reduce the carbon footprint in the steel production industry. Statement of the invention

[0008] To this end, the invention relates to an industrial system comprising: - a metallurgical installation which includes a heat treatment module configured to treat a product such as iron ore and / or raw and / or recycled steel, - a dihydrogen production facility comprising an electrochemical device such as a vapor phase electrolyzer, the electrochemical device being configured to form one or more output streams from a stream of an input fluid, at least one of said output streams comprising dihydrogen.

[0009] According to a first aspect, the system of the invention may comprise a heat transfer device configured to recover heat produced by the metallurgical installation and transfer it to said input stream.

[0010] In one embodiment, the heat transfer device is configured to recover heat from one or more fluid streams exiting the heat treatment module.

[0011] In a non-limiting manner, the fluid flow(s) leaving the treatment module thermal may include one or more combustion gases and / or a mixture of nitrogen and dihydrogen.

[0012] For example: - one of said fluid flows leaving the heat treatment module may comprise one or more combustion gases, typically during a step of heating the product to be treated within the heat treatment module, and / or - another of said fluid flows leaving the heat treatment module may comprise a mixture of nitrogen and dihydrogen, or a fluid having another composition, typically during a step of cooling the product to be treated within the heat treatment module.

[0013] In one embodiment, the metallurgical facility comprises one or more cooling modules.

[0014] In this embodiment, the heat transfer device may be configured to recover heat from one or more of said cooling modules.

[0015] In one embodiment, at least one of said cooling modules is configured to cool said product using a gas flow such as air.

[0016] In other words, the metallurgical installation may include an air cooler.

[0017] In the context of this embodiment, the heat transfer device may be configured to recover heat from this gas flow, preferably after extraction of this gas flow from the corresponding cooling module.

[0018] In one embodiment, at least one of said cooling modules is configured to cool said product using a flow of liquid such as water.

[0019] In other words, the metallurgical installation may comprise a water cooler, in addition to or instead of said air cooler.

[0020] In the context of this embodiment, the heat transfer device may be configured to recover heat from this liquid flow, preferably after extraction of this liquid flow from the corresponding cooling module.

[0021] In one embodiment, the heat transfer device is configured to change said input stream from the liquid state to the gaseous state.

[0022] This embodiment is of particular interest when the electrochemical device is a vapor phase electrolyzer, it being understood that the hydrogen production installation of the system of the invention may comprise another type of electrochemical device, for example a liquid phase electrolyzer.

[0023] The invention thus makes it possible to use waste heat which may come from different heat sources in the metallurgical installation and, in a non-limiting manner, to use this heat to produce water vapor. It is thus possible to reduce the use of electrical energy to produce dihydrogen, thereby improving the energy efficiency of the electrochemical device.

[0024] According to a second aspect which is independent of said first aspect, the system of the invention may comprise a transport member configured to convey one or more of said output streams formed by the electrochemical device to the metallurgical installation.

[0025] In one embodiment, said transport member is configured to introduce one or more of these flows into the heat treatment module and / or into a combustion zone and / or into one or more other pieces of equipment of the metallurgical installation.

[0026] The transport member may comprise one or more conduits and / or one or more pieces of equipment making it possible to ensure or optimize this fluid transport function.

[0027] In one embodiment, one or more of said output streams formed by the electrochemical device are introduced into the heat treatment module and / or into the combustion zone and / or into one or more other pieces of equipment of the metallurgical installation, so as to form a reducing agent and / or a fuel and / or an oxidizer.

[0028] For example: - all or part of the output stream comprising dihydrogen may form a reducing agent and may optionally be mixed with another reducing agent called the main reducing agent, making it possible to reduce the carbon dioxide emissions linked to the production of dihydrogen generally required to implement a metallurgical installation, the conventional production of dihydrogen using carbon-based processes, such as methane reforming; and / or - all or part of the output stream comprising dihydrogen may form a fuel and may optionally be mixed with another so-called main fuel such as methane, making it possible to reduce carbon dioxide emissions linked to fuel burning and to contribute to the electrification of the heat treatment areas; and / or - all or part of another output stream formed by the electrochemical device, comprising dioxygen, can form an oxidant and can optionally be mixed with another so-called main oxidant such as air, making it possible to reduce the presence of inert gases such as nitrogen to be heated and the fuel requirements.

[0029] Such a coupling makes it possible to reduce the carbon footprint of the metallurgical installation by using low-carbon dihydrogen as an agent and / or fuel rather than dihydrogen obtained from fossil fuels such as natural gas or coal.

[0030] The system may comprise one or more heat transfer devices according to said first aspect and / or one or more transport members according to said second aspect, or only one or more heat transfer devices according to said first aspect, or only one or more transport members according to said second aspect.

[0031] In one embodiment, the system comprises one or more members for purifying and / or compressing one or more of said output streams formed by the electrochemical device.

[0032] When the system comprises a transport member as defined above, the purification and / or compression member(s) may be configured to purify and / or compress one or more of said output streams formed by the electrochemical device before their introduction into the metallurgical installation.

[0033] The invention also relates to an industrial process implementing a system as defined above.

[0034] The method can thus comprise: - treatment of a product such as iron ore and / or raw and / or recycled steel using the heat treatment module of the metallurgical installation of said system, - the formation, using the electrochemical device of the hydrogen production installation of said system, of one or more output streams from a stream of an input fluid, at least one of said output streams comprising hydrogen.

[0035] Depending on the architecture of the system and the aforementioned characteristics that it comprises, the method may comprise: - an implementation of the heat transfer device of said system so as to recover heat produced by the metallurgical installation, for example heat from one or more fluid flows leaving one or more heat treatment modules and / or one or more cooling modules of the metallurgical installation, and / or - an implementation of said heat transfer device so as to transfer the heat thus recovered to said input flow, and / or - an implementation of said transport member so as to convey one or more of said output streams formed by the electrochemical device to the metallurgical installation and / or to introduce one or more of these streams into the heat treatment module and / or into a combustion zone and / or into one or more other pieces of equipment of the metallurgical installation, for example so as to form a reducing agent and / or a fuel and / or an oxidizer, and / or - a treatment of one or more of said output streams formed by the electrochemical device using one or more of said purification and / or compression members, in order to purify and / or compress one or more of these output streams, for example before their introduction into the metallurgical installation.

[0036] Other advantages and characteristics of the invention will appear on reading the detailed, non-limiting description which follows. Brief description of the figures

[0037] The following detailed description refers to the accompanying drawings in which: - [Fig.l] is a schematic view of an industrial system comprising a metallurgical installation, a dihydrogen production installation and a device configured to transfer heat from the metallurgical installation to the dihydrogen production installation; - [Fig.2] is a schematic view of a metallurgical installation and heat recovery units, the metallurgical installation comprising a heat treatment module, a surface treatment module and two cooling modules; - [Fig.3] is a schematic view of a metallurgical installation and heat recovery units, the metallurgical installation comprising a heat treatment module and two cooling modules; - [Fig.4] is a schematic view of an industrial system comprising a metallurgical installation, a dihydrogen production installation and a device configured to convey one or more fluids produced by the dihydrogen production installation to the metallurgical installation; - [Fig.5] is a schematic view of a first variant embodiment of the system of [Fig.4]; - [Fig.6] is a schematic view of a second variant embodiment of the system of [Fig.4]; - [Fig.7] is a schematic view of an industrial system comprising a metallurgical installation, a dihydrogen production installation, a device configured to transfer heat from the metallurgical installation to the dihydrogen production installation, and a device configured to convey one or more fluids produced by the dihydrogen production installation to the metallurgical installation.

[0038] Common references are used in the various figures to designate identical or similar elements. Detailed description of embodiments

[0039] [Fig.l] schematically represents an industrial system 1 according to a first embodiment.

[0040] System 1 is in this example intended for the co-production of treated steel and di-hydrogen.

[0041] In the embodiment of [Fig.l], the system 1 comprises a metallurgical installation 2, a dihydrogen production installation 3 and a device 4 providing a coupling, or an interface, between the installations 2 and 3.

[0042] In this embodiment, the device 4 is more precisely a heat transfer device which is configured to recover heat produced by the metallurgical installation 2 and to use the heat thus recovered in the installation 3 for the production of dihydrogen.

[0043] The installation 3 comprises an electrochemical device for producing dihydrogen from a flow of an inlet fluid.

[0044] In this non-limiting example, the electrochemical device is an electrolyser comprising solid oxide electrolytic cells enabling vapor phase electrolysis to be carried out. This electrochemical device forms a technology known under the English name “Solid Oxide Electrolysis Cell” (SOEC).

[0045] In a manner known per se, such an electrolyser comprises one or more stacks of cells each forming a cathode, an anode and an electrolyte, so as to constitute a reaction zone.

[0046] The electrochemical device of the installation 3 is in this example configured to carry out high-temperature electrolysis, so as to form, on the one hand, a first outlet flow of a fluid which comprises dihydrogen and, on the other hand, a second outlet flow of a fluid which comprises dioxygen, from said inlet flow which comprises in this example water vapor having a temperature which can typically be between 100°C and 850°C.

[0047] [Fig. 2] shows a metallurgical installation 2 which can be implemented in a system according to the invention.

[0048] In the non-limiting example of [Fig. 2], the installation 2 comprises a heat treatment module 11, of the furnace type, a surface treatment module 12, cooling modules 13 and 14, a combustion zone 15, of the burner type of said furnace, and a cooling tower 16.

[0049] This installation 2 is configured to process a product called “to be processed”, successively in modules 11, 12, 13 and 14, [Fig.2] illustrating with broken line arrows the path taken by the product to be processed within the installation 2.

[0050] In this example, the product to be treated which is introduced into module 11 comprises raw or recycled steel.

[0051] The installation 2 of [Fig.2] comprises a fluid network including conduits 21 and 22 which are configured to introduce into the combustion zone 15 a fuel and an oxidant, respectively, in order to form in the combustion zone 15 one or more combustion gases.

[0052] The fluid network also comprises a conduit 23 configured to convey a flow of the combustion gas(es) leaving the combustion zone 15 to the heat treatment module 11, in particular into an enclosure (not specifically shown) formed by the module 11 and in which the product to be treated is placed. The flow of combustion gas forms a so-called heating flow.

[0053] The fluid network also comprises a conduit 24 configured to extract said heating flow from the heat treatment module 11 after it has circulated in the enclosure of this module 11.

[0054] The fluid network further comprises conduits 25, 26, 27 and 28 which are configured to convey a flow of a so-called cooling fluid.

[0055] With reference to [Fig. 2], the conduits 26, 27 and 28 form a circuit configured to circulate said cooling flow between the refrigeration tower 16 and the heat treatment module 11, the conduit 27 being configured to convey the cooling flow leaving the enclosure of the module 11 to the refrigeration tower 16 in which this flow can be cooled, the conduits 28 and 26 being configured to convey the cooling flow leaving the refrigeration tower 16 to the module 11.

[0056] The conduit 25 is configured to introduce the cooling flow into this circuit.

[0057] A conduit 29 is provided in this example to allow an escape of losses of the cooling flow.

[0058] In this example, the cooling flow which is introduced into the heat treatment module 11 via the conduit 25 comprises a mixture of nitrogen and di-hydrogen.

[0059] Concerning the surface treatment module 12 of the installation 2 of [Fig. 2], this is configured to carry out a chemical treatment of the product treated by the module 11. In a non-limiting manner, the module 12 can be configured to carry out a treatment by dipping (“dip coating” in English), in order to give said product specific properties, for example in terms of resistance to corrosion and / or erosion.

[0060] Still with reference to [Fig.2], the cooling module 13 is in this example configured to cool said product using a gas flow which in this example comprises air, the module 13 thus forming an air cooler.

[0061] The fluid network comprises a conduit 31 configured to introduce this air flow into the cooler 13 and a conduit 32 to extract this air flow from the cooler 13.

[0062] In this example, the cooling module 14 is configured to cool said product using a flow of liquid which in this example comprises water, the module 14 thus forming a water cooler.

[0063] The fluid network comprises a conduit 33 configured to introduce this flow of water into the cooler 14 and a conduit 34 to extract this flow of water from the cooler 14.

[0064] In a non-limiting manner, the installation 2 of [Fig.2] is here equipped with heat recovery units 41, 42, 43 and 44.

[0065] These units 41, 42, 43 and 44 are in this example configured to be able to recover heat which is carried by, respectively, said heating flow leaving the heat treatment module 11 via the conduit 24, said cooling flow leaving the heat treatment module 11 via the conduit 27, said air flow leaving the cooler 13 via the conduit 32 and said water flow leaving the cooler 14 via the conduit 34.

[0066] An example of implementation of the installation 2 of [Fig. 2] will now be briefly described, it being understood that the operation of such an installation is known as such, that is to say independently of its implementation in a system according to the invention.

[0067] The product to be treated is introduced into the heat treatment module 11 to undergo a heat treatment, under the action of the heating flow. Several treatment steps are typically carried out as the temperature increases, for example a preheating step when the temperature is in a range between 300°C and 500°C, a heating step when the temperature is in a range between 700°C and 800°C, and a temperature maintenance step when the temperature reaches a temperature in a range between 800°C and 1000°C.

[0068] The heating flow is here obtained by combustion in the combustion zone 15 of a fuel such as methane, in the presence of an oxidant such as air. The heat treatment module 11 can be configured so that the heating flow, i.e. the hot combustion fumes coming from the combustion zone 15, circulate in the enclosure of this module 11 in counter-current and exit therefrom, here via the conduit 24, at a temperature which can typically be in the range 400°C-800°C. Optionally, these hot fumes can be used to preheat the air at the inlet of the combustion zone 15.

[0069] After heating said product to be treated in the manner described above, the installation 2 can be implemented to carry out a cooling step within the module 11. To do this, the cooling flow - which can typically comprise a mixture comprising nitrogen and at least 5% dihydrogen - is circulated in the enclosure of the module 11, in the circuit formed by the conduits 26, 27 and 28 and in the cooling tower 16, so that the cooling flow has, in the enclosure of the module 11, a temperature comprised for example in the range 400°C-500°C. The cooling flow can form in the enclosure of the module 11 an inert atmosphere making it possible to reduce the risks of oxidation of said product which in this example is steel.

[0070] In this example, said product thus cooled in module 11 undergoes a surface treatment within module 12, then is successively cooled in module 13 using the air flow to a temperature which can be in the range 100°C-200°C and in module 14 by soaking in water at a temperature which can be in the range 50°C-100°C.

[0071] According to a first variant of the embodiment of [Fig.l], the metallurgical installation 2 of the system 1 of [Fig.l] is in accordance with the installation 2 described above with reference to [Fig.2] and the heat transfer device 4 of the system 1 of [Fig.l] comprises the heat recovery units 41, 42, 43 and 44 illustrated in [Fig.2],

[0072] Units 41-44 thus make it possible to recover heat produced by metallurgical installation 2, at different stages of its operation, and to use the heat thus recovered for the production of dihydrogen carried out by installation 3 of system 1.

[0073] The heat recovered by the heat transfer device 4 is used to increase the temperature of said input flow before its introduction into the electrochemical device, in this example to change this input flow from the liquid state to the gaseous state.

[0074] The heat transfer device 4 and, in this particular example, the heat recovery units 41, 42, 43 and 44 thus make it possible to produce superheated water vapor.

[0075] Of course, electrical energy can be used alternatively or additionally to increase the temperature of this input stream.

[0076] Generally, the heat transfer device 4 and / or one or more of said heat recovery units 41, 42, 43 and 44 may comprise one or more pieces of equipment each of which may be chosen from a non-limiting list including an economizer, a recuperator, a heat exchanger, an electric heater, a degasser, a vaporizer, a superheater, a heat storage device, an electrical energy storage device and a heat pump.

[0077] Of course, the heat transfer device 4 can be configured to transfer the heat thus recovered to said input flow via a transfer fluid such as water or thermal oil.

[0078] According to a second variant of the embodiment of [Fig.l], the mechanical installation The metallurgical system 2 of system 1 of [Fig.l] is in accordance with the installation 2 illustrated in [Fig.3] which is described below only according to its differences from the installation 2 of [Fig.2]. The preceding description applies by analogy.

[0079] Installation 2 of [Fig.3] does not have a surface treatment module.

[0080] In the embodiment of [Fig.3], the cooling flow is introduced into the module 11 via the conduit 25 at ambient temperature, the installation 2 not including a cooling device for this flow such as the cooling tower 16 of the installation of [Fig.2].

[0081] In the context of this second variant, the heat transfer device 4 of the system 1 of [Fig.l] comprises the heat recovery units 41, 43 and 44 illustrated in [Fig.3].

[0082] [Fig. 4] schematically represents an industrial system 1 according to a second embodiment, which is described only according to its differences from the embodiment of [Fig. 1]. The preceding description applies by analogy to this second embodiment, including the description of the metallurgical installation 2 which is made with reference to Figures 2 and 3.

[0083] System 1 of [Fig.4] differs from that of [Fig.l] in that it comprises another type of device for coupling installations 2 and 3.

[0084] In particular, the system 1 of [Fig.4] comprises in this example a device 100 which does not form a heat transfer device as described above but which forms a member, called a transport member, configured to convey one or more of said output flows formed by the electrochemical device of the hydrogen production installation 3 to the metallurgical installation 2.

[0085] A first variant of the embodiment of [Fig.4] is illustrated in [Fig.5].

[0086] [Fig.5] shows a fluid network of system 1 which includes, in a non-limiting manner mitative: - conduits 111 and 112 configured to introduce into the electrochemical device of the installation 3 respectively said inlet flow and a sweeping gas, - conduits 113, 114 and 115 configured to convey said first output flow formed by the electrochemical device, i.e. the output flow comprising dihydrogen, - a conduit 116 configured to convey said second output flow formed by the electrochemical device, i.e. the output flow comprising dioxygen.

[0087] In this example, the conduits 113 to 116 are configured to convey said output flows formed by the electrochemical device of the installation 3 to the metallurgical installation 2.

[0088] More precisely, the conduit 114 is here configured to convey a first fraction of said first output flow formed by the electrochemical device towards a branch of the conduit 25, so that said cooling flow introduced into the heat treatment module 11 of the installation 2 comprises a mixture of di-hydrogen formed by the electrochemical device and fluid introduced into the heat treatment module 11 via the conduit 25 (see also figures 2 and 3).

[0089] In the example of [Fig. 5], the conduit 115 is configured to convey a second fraction of said first output flow formed by the electrochemical device towards a branch of the conduit 21, so that said fuel introduced into the combustion zone 15 of the installation 2 comprises a mixture of dihydrogen formed by the electrochemical device and a so-called main fuel such as methane introduced into the combustion zone 15 via the conduit 21 (see also FIGS. 2 and 3).

[0090] The conduit 116 of the system 1 of [Fig. 5] is configured to convey said second outlet flow formed by the electrochemical device to a branch of the conduit 22, so that said oxidant introduced into the combustion zone 15 of the installation 2 comprises a mixture of oxygen formed by the electrochemical device and a so-called main oxidant such as air introduced into the combustion zone 15 via the conduit 22 (see also figures 2 and 3).

[0091] With reference to figures 4 and 5, said transport member 100 of the system 1 is, in the context of this first variant embodiment, formed by the conduits 113 to 116.

[0092] A second variant of the embodiment of [Fig.4] is illustrated in [Fig.6], which is described only according to its differences from the variant of [Fig.5]. The preceding description applies by analogy.

[0093] In the example of [Fig.6], the transport member 100 of the system 1 is also formed by the conduits 113 to 116 but the conduits 114, 115 and 116 respectively form said conduits 25, 21 and 22, respectively, of the installation 2 of [Fig.3] or 4.

[0094] In other words, in this non-limiting example, said cooling flow introduced into the heat treatment module 11 of the installation 2 is entirely formed from said first fraction of the first output flow formed by the electrochemical device, the fuel introduced into the combustion zone 15 of the installation 2 is entirely formed from said second fraction of the first output flow formed by the electrochemical device, and the oxidant introduced into the combustion zone 15 of the installation 2 is entirely formed from the second output flow formed by the electrochemical device (see also figures 2 and 3).

[0095] In the example of [Fig.6], the duct 24 for extracting the heating flow from the heat treatment module 11 is connected to a branch of the duct 111 so as to mix this heating flow with the inlet flow before its introduction into the electrochemical device.

[0096] [Fig.7] schematically represents an industrial system 1 according to a third embodiment which combines the principles of the embodiments of figures 1 and 4.

[0097] Thus, in this example, the system 1 of [Fig.7] comprises on the one hand a heat transfer device 4 such as in the system of [Fig.1], according to any one of the variants described above, in particular with reference to Figures 2 and 3 and, on the other hand, a transport member 100 such as in the system of [Fig.4], according to any one of the variants described above, in particular with reference to Figures 5 and 6.

[0098] The preceding description of course applies by analogy to this third embodiment.

[0099] Of course, the invention is not limited to the examples which have just been described, each of these examples being able in particular to implement one or more of the non-limiting variants which follow.

[0100] Concerning for example the installation for producing dihydrogen, this may comprise one or more electrochemical devices different from that described above, for example a device configured to carry out alkaline electrolysis or proton exchange membrane electrolysis.

[0101] Furthermore, the hydrogen production installation of the system of the invention can be configured to operate without a sweeping gas, the system thus being able to be devoid of means for introducing a sweeping gas into the electrochemical device. For non-limiting example, the system 1 of [Fig.6] can be devoid of the conduit 112.

[0102] In alternative embodiments, the system may comprise one or more members for purifying and / or compressing one or more of the output streams formed by the electrochemical device. For example, when the system comprises a coupling device such as the transport member 100 illustrated in [Fig. 4], such purification and / or compression members may be arranged to purify and / or compress one or more of the output streams or one or more fractions of these output streams before introduction into the metallurgical installation 2.

[0103] The metallurgical installation may of course be different from those illustrated in Figures 2 and 3 and include in particular another combination and a different number of heat treatment and / or surface treatment and / or cooling modules.

[0104] When the metallurgical installation comprises a cooling member for said cooling flow introduced into a heat treatment module, this cooling member may alternatively or additionally comprise a heat exchanger or more generally equipment different from the cooling tower. generation 16 illustrated in [Fig.2].

[0105] The system of the invention may comprise a heat transfer device which comprises one or more heat recovery units among those illustrated in figures 2 and 3 and / or one or more other heat recovery units (not shown), depending in particular on the architecture of the metallurgical installation 2 and the available heat sources.

[0106] More generally, the system of the invention and in particular the hydrogen production installation can of course comprise numerous conventional pieces of equipment which are not described above, for example one or more pumps, one or more compressors, one or more fans, one or more flow control valves, one or more ejectors, etc.

[0107] The invention may further be implemented to process, within the metallurgical installation, a product other than crude or recycled steel, for example iron ore. The metallurgical installation may for this purpose comprise one or more modules (not shown) configured to convert the iron ore into crude steel and / or to carry out refining and / or ladle casting operations, for example.

Claims

Claims

1. Industrial system (1) comprising: - a metallurgical installation (2) which comprises a heat treatment module (11) configured to treat a product such as iron ore and / or raw and / or recycled steel, - a dihydrogen production installation (3) comprising an electrochemical device such as a vapor phase electrolyzer, the electrochemical device being configured to form one or more output streams from a stream of an input fluid, at least one of said output streams comprising dihydrogen, - a heat transfer device (4, 41-44) configured to recover heat produced by the metallurgical installation (2) and transfer it to said input stream.

2. System (1) according to claim 1, wherein the heat transfer device (4, 41-44) is configured to recover heat from one or more fluid streams exiting the heat treatment module, these fluid streams possibly comprising one or more combustion gases and / or a mixture of nitrogen and dihydrogen.

3. System (1) according to claim 1 or 2, wherein the metallurgical installation (2) comprises one or more cooling modules (13, 14), the heat transfer device (4, 43, 44) being configured to recover heat from one or more of said cooling modules (13, 14).

4. System (1) according to claim 3, wherein at least one of said cooling modules (13) is configured to cool said product using a gas flow such as air, the heat transfer device (4, 43) being configured to recover heat from this gas flow.

5. System (1) according to claim 3 or 4, wherein at least one of said cooling modules (14) is configured to cool said product using a flow of liquid such as water, the heat transfer device (4, 44) being configured to recover heat from this flow of liquid.

6. System (1) according to any one of claims 1 to 5, in wherein the heat transfer device (4) is configured to change said input stream from the liquid state to the gaseous state.

7. System (1) according to any one of claims 1 to 6, comprising a transport member (100, 113-116) configured to convey one or more of said output streams formed by the electrochemical device to the metallurgical installation (2) and to introduce one or more of these streams into the heat treatment module (11) and / or into a combustion zone (15) of the metallurgical installation (2).

8. System (1) according to claim 7, wherein one or more of said output streams formed by the electrochemical device are introduced into the heat treatment module (11) and / or into the combustion zone (15) so as to form a reducing agent and / or a fuel and / or an oxidizer.

9. System (1) according to any one of claims 1 to 8, comprising one or more members for purifying and / or compressing one or more of said output flows formed by the electrochemical device.

10. Industrial method implementing a system (1) according to any one of claims 1 to 9, the method comprising: - a treatment of a product such as iron ore and / or crude and / or recycled steel using the heat treatment module (11) of the metallurgical installation (2) of said system (1), - the formation, using the electrochemical device of the hydrogen production installation (3) of said system (1), of one or more output streams from a stream of an input fluid, at least one of said output streams comprising dihydrogen, - an implementation of the heat transfer device (4, 41-44) of said system (1) so as to recover heat produced by the metallurgical installation (2) and transfer it to said input stream.

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