DE102021006669A1 - Process and processing system for heating and further processing metal-containing products using solar thermal energy - Google Patents

Abstract

The present invention discloses a method for heating and further processing at least one metal-containing product (M1, M2), wherein the at least one metal-containing product (M1, M2) is a metal-containing semi-finished product and/or scrap and/or sponge iron and/or HBI, the method having the following method steps:- heating (S1) of a primary heat transport fluid (HTF1) by means of concentrated solar radiation;- transferring (S11, SS1, S21, S221, S31) thermal energy of the primary heat transport fluid (HTF1) to the metal-containing product ( M1, M2); and- processing (SP) of the heated metal-containing product (M1, M2).Furthermore, the present invention discloses a processing system (1) for heating and further processing at least one metal-containing product (M1, M2), wherein the at least one metal-containing product (M1 , M2) is a semi-finished product containing metal and/or scrap and/or sponge iron and/or HBI, having:- a fluid heating device (3) which is designed to heat a primary heat transport fluid (HTF1) by means of concentrated solar radiation;- a heating device (41, 42, 43), which is designed to transfer heat from the primary heat transport fluid (HTF1) at least indirectly to the metal-containing product (M1, M2); and - processing means (50) for processing the heated metalliferous product (M1, M2).

Description

The present invention relates to a method for heating metal-containing products using concentrated solar radiation and for further processing the metal-containing products heated by means of concentrated solar radiation. Furthermore, the present invention relates to a processing system for heating metal-containing products using concentrated solar radiation and for further processing the metal-containing products heated by means of concentrated solar radiation.

In various processes of manufacturing metal-containing products, considerable amounts of heat are sometimes required. This heat is provided in a variety of ways today. Known methods use, for example, burner installations in which natural gas, coke oven gas, blast furnace gas or similar energy carriers are burned. This generates significant amounts of carbon dioxide. Furthermore, burners are known which are suitable for burning hydrogen. The production of hydrogen also produces significant amounts of carbon dioxide if no renewable energy sources are used to produce it. There are also a number of electrical heating options, including arc furnaces, in which the radiation emitted by the arc heats up the metallic goods, resistance heating, in which current through ohmic heating heats up a radiator, which in turn heats up a metal-containing goods using the emitted radiation, induction heating, in which currents are induced directly in the metal-bearing goods, which in turn heat the metal-bearing goods directly through ohmic heating, direct resistance heating, in which the metal-bearing goods are directly integrated into an electric circuit and are heated due to their own resistance, and much more. m. The generation of this electricity also generates large amounts of carbon dioxide if renewable energy sources are not used in its production.

Electricity is generated in a variety of ways these days. Renewable and non-renewable energy sources are used for this. Renewable energy sources include, in particular, solar energy, hydroelectric power and wind energy. Solar energy is converted into electricity using solar cells, which can then be used as needed.

Non-renewable energy sources include nuclear power, oil, gas, coal power plants.

The object of the present invention is to provide a method for heating and further processing at least one metal-containing product, by means of which, compared to methods known from the prior art, a significant reduction in the emission of greenhouse gases and in particular a reduction in the emission of carbon dioxide is realized is.

The object on which the present invention is based is achieved by a method having the features specified in claim 1 . Refinements of the method are described in the dependent claims.

More specifically, the object on which the present invention is based is achieved by a method for heating and further processing metal-containing products, the metal-containing product being a metal-containing semi-finished product and/or scrap and/or sponge iron and/or HBI, the method including a method step for heating a primary heat transfer fluid by means of concentrated solar radiation, followed by a step of transferring thermal energy of the primary heat transfer fluid to the metalliferous product, which in turn is followed by a step of processing the heated metalliferous product.

The method according to the invention has the advantage that significantly less energy, and possibly no energy that is obtained from fossil fuels or by means of nuclear power, is required for heating and further processing a metal-containing product. As a result, significantly less and possibly no carbon dioxide is generated during the heating and subsequent further processing of a metal-containing product.

Due to the use of concentrated solar radiation and thus due to the use of solar thermal energy, the method according to the invention has a high degree of efficiency with regard to the energy portion of the solar radiation used for heating. Due to the use of concentrated solar radiation, in the region of or more than 30% of the radiant energy of the concentrated solar radiation can be used for heating a metallic product. This efficiency is considerably higher than when using photovoltaics. When using photovoltaics, sunlight is used to generate electrical energy, with photovoltaic modules that can be used on an industrial scale having an efficiency of around 25%. As a result, only 25% of the energy in solar radiation is converted into electrical energy. This electrical energy still has to be converted into thermal energy, which further reduces the overall efficiency until the metal-containing product is heated.

The thermal energy of the primary heat transport fluid is transferred to the metal-containing product in a furnace, for example. An oven is to be understood as a device that can heat a given area of space to a higher temperature than a room area adjacent to the given area of space. For example, the furnace is designed as a melting furnace, or as a tunnel furnace, or as a reheating furnace, or as an annealing furnace, or as a top hat furnace, or as a heat treatment line, or as a flotation furnace. For example, the heat transfer fluid flows through the furnace. According to the invention, there are no restrictions whatsoever with regard to the design of the furnace.

The metal-containing product can be any product that is designed as a metal-containing semi-finished product and/or scrap and/or sponge iron and/or HBI and contains at least one metal (e.g. iron, copper, aluminum, nickel, tin, titanium or at least one alloy comprising these metals). When the metal-containing product is formed as a semi-finished product comprising metal, it may be formed, for example, as a slab or a billet, etc. Sponge iron is also known as DRI (English abbreviation for Direct Reduced Iron). HBI is the English abbreviation for Hot Briquetted Iron. Within the meaning of the invention, ores, in particular iron ore, are not a metal-containing product.

Processing of the metal-containing product means, for example, mechanical forming (e.g. rolling) and/or pressing and/or press hardening, chemical modification (e.g. reduction) and/or changing the material structure (e.g. changing a microstructure of the metal-containing product, tempering, annealing, melting, etc.), or to understand another type of processing. According to the invention, there are no restrictions with regard to the processing of the metallic product.

The primary heat transport fluid is preferably heated to a temperature in the range between 500°C and 1700°C, preferably in the range between 700°C and 1700°C, more preferably in the range between 800°C and 1650°C by means of the concentrated solar radiation preferably in the range between 900°C and 1650°C, more preferably in the range between 900°C and 1600°C, more preferably in the range between 1100°C and 1650°C, more preferably in the range between 1200°C and 1600°C , more preferably in the range between 1300°C to 1600°C, more preferably in the range between 1400°C to 1550°C, more preferably in the range between 1400°C to 1500°C.

For example, the method is designed in such a way that the primary heat transport fluid is heated to a temperature in the range between 1500° C. and 1600° C., more preferably to 1550° C., by means of concentrated solar radiation. This temperature range is particularly suitable for melting scrap and/or directly reduced iron.

For example, the method is designed in such a way that the primary heat transport fluid is heated to a temperature in the range between 600° C. and 850° C. by means of concentrated solar radiation. This temperature range is particularly suitable for preheating scrap and/or direct reduced iron.

For example, the method is designed in such a way that the primary heat transport fluid is heated to a temperature in the range between 800° C. and 1250° C., preferably between 900° C. and 1200° C., more preferably between 1000° C. and 1150° C. and is again more preferably heated to 1200°C. This temperature range is particularly suitable for reheating slabs and/or billets or other ferrous semi-finished products before further processing.

For example, the method is designed in such a way that the primary heat transport fluid is heated to a temperature in the range between 500° C. and 800° C., preferably between 550° C. and 750° C., more preferably between 600° C. and 700° C., by means of concentrated solar radiation. and again more preferably heated to 650°C. This temperature range is particularly suitable for tempering and annealing strips and/or sheets or other ferrous semi-finished products.

For example, the method is designed in such a way that the primary heat transport fluid is heated to a temperature in the range between 600° C. and 900° C., preferably between 650° C. and 850° C., more preferably between 700° C. and 800° C., by means of concentrated solar radiation. further further preferably heated to 750°C. This temperature range is particularly suitable for the continuous annealing of slabs and/or billets and/or strips and/or sheets or other ferrous semi-finished products.

For example, the method is designed in such a way that iron ore is heated at least indirectly by means of concentrated solar radiation to a temperature in the temperature range between 100° C. and 1500° C., preferably to a temperature in the temperature range between 500° C. and 1000 °C is heated. This is particularly advantageous for Processing the iron ore in a blast furnace, since less energy is required to heat the iron ore than is usually provided by burning coke. Furthermore, by preheating the iron ore, it is possible to reduce the ratio of coke to ore in the blast furnace process. The blast furnace process is used to produce pig iron, which is the starting material for steel production. The reduction of the ore is a necessary step to this.

For example, the method is designed in such a way that scrap and/or sponge iron (also known as DRI (English abbreviation for Direct Reduced Iron)) and/or HBI (English abbreviation for Hot Briquetted Iron) are at least indirectly transported by means of the primary heat transport fluid, the has been heated by means of concentrated solar radiation is heated to a temperature in the temperature range between 100°C and 1500°C, preferably to a temperature in the temperature range between 500°C and 1000°C. This is particularly advantageous when processing the scrap and/or the DRI and/or the HBI when melting it down in an electric arc furnace or in an induction furnace or in a converter. The melting of these iron carriers is necessary in order to achieve the desired alloy composition and to be able to cast the necessary product formats (for the respective later applications).

For example, the method is designed in such a way that alloying agents and/or slag formers are heated to a temperature in the temperature range between 100° C. and 1500° C., preferably to a temperature in the temperature range between 500 °C and 1000°C is heated. This is particularly advantageous when processing in a ladle furnace.

For example, the method is designed in such a way that slabs are heated at least indirectly by means of the primary heat transport fluid, which was heated by means of concentrated solar radiation, to a temperature in the temperature range between 1000° C. and 1300° C., preferably to a temperature in the temperature range between 1100° C. and 1200 °C is heated. This is particularly advantageous when processing the slabs in a tunnel furnace. In the CSP process or similar methods with a combination of casting and rolling, the slabs are often a bit too cold for efficient and material-technically advantageous hot forming. In addition, the temperature profile inside the slabs after casting is not uniform. In order to raise the temperature level for efficient hot forming and at the same time to equalize the temperature of a slab, tunnel furnaces are used ("Roller Hearth Furnaces" - a series of rollers over which the slabs are transported, enclosed by a furnace that is heated by burners).

For example, the method is designed in such a way that metallic semi-finished products are at least indirectly heated to a temperature in the temperature range between 800° C. and 1300° C., preferably to a temperature in the temperature range between 900° C. and 1250°C is heated. For efficient hot forming in hot rolling mills, the slabs, billets or blocks (in general: the metallic semi-finished products) from the upstream casting processes are heated. Since casting and rolling are often decoupled from each other, cold charging is often practiced, i.e. the slabs, billets or ingots are placed in a furnace at almost room temperature. For hot forming, it is advantageous if the temperature level is high, since the forming resistance of the products is then lower. Since steel (depending on the alloy) also undergoes a phase transformation from about 900 °C, which should usually be avoided (exceptions: ferritic rolling, possibly thermomechanical rolling), but a significant supply of energy and temperature increase is hardly possible within the plants, the The starting temperature of the rolling processes must be selected sufficiently high. Furthermore, it is desirable to achieve the greatest possible recrystallization of the structure between the forming steps. Since this is highly temperature-controlled, a sufficiently high temperature level must also be ensured here.

For example, the method is designed in such a way that a steel strip is at least indirectly heated to a temperature in the temperature range between 0 °C and 100 °C, preferably to a temperature in the temperature range between 60 °C and 80°C is heated. The steel strip is pickled in order to remove the layer of scale (iron oxide) that forms during hot forming for subsequent cold forming and, if necessary, coating. The steel strip runs through warm/hot acid baths (80-90 °C). The high temperature is required in order to allow the chemical reactions to take place sufficiently quickly so that a high throughput of steel strip is possible for a given length of plant. The reaction rates are strongly dependent on temperature. Normally, the strip enters the pickling tank at ambient temperature and is first warmed up by the acid bath, so that a considerable heat output is required to keep the baths at the process temperature. By preheating the Metal band can achieve an increase in performance and the heating of the acid can be made more efficient.

For example, the method is designed in such a way that a metal-containing product (preferably a product containing steel) is at least indirectly heated to a temperature in the temperature range between 100° C. and 800° C. by means of the primary heat transport fluid, which was heated by means of concentrated solar radiation is heated to a temperature in the temperature range between 650°C and 800°C. After cold forming, steel materials are less ductile and less formable. In order to restore better formability, the material can be recrystallized annealed. Here, a restructuring of the grains of the structure takes place. This heating in a furnace is also referred to as continuous annealing.

For example, the method is designed in such a way that a metal-containing product (preferably a product that has stainless steel or RSH steels (rust, acid, heat-resistant steels)) at least indirectly by means of the primary heat transport fluid, which was heated by means of concentrated solar radiation a temperature in the temperature range between 100°C and 1200°C, preferably to a temperature in the temperature range between 800°C and 1200°C. Heat treatment also takes place with stainless steels. This is usually carried out both after hot and after cold forming. The metal-containing product is heated in an annealing furnace.

For example, the method is designed in such a way that a metal-containing product is at least indirectly heated to a temperature in the temperature range between 100° C. and 900° C., preferably to a temperature in the temperature range between 750° C and 850°C. For AHSS (Advanced high Strength steels), especially dual-phase, complex-phase, TRIP or Q&P steels, heat treatment takes place with the aim of adjusting certain phase proportions of the different low-temperature phases of steel (austenite, ferrite, bainite, martensite, pearlite, etc. ). For this purpose, the material is heated to a temperature range in which the structure is wholly or partially austenite and then subjected to a targeted cooling process.

For example, the method is designed in such a way that a metal-containing product is at least indirectly heated to a temperature in the temperature range between 100° C. and 500° C., preferably to a temperature in the temperature range between 450° C and 480°C before being subjected to a processing step of hot dip finishing. Steel is coated with zinc for many other applications to prevent corrosion. In hot-dip galvanizing, the steel strip or piece is immersed in a bath of liquid zinc. After the steel strip or piece of steel has left the zinc bath, air nozzles wipe off excess zinc. The zinc bath has temperatures of around 450 °C. The correspondingly designed method has the advantage that coating errors are avoided. The inventors have found that the steel strip should have a temperature of around 470° C. when it enters the zinc bath in order to achieve uniform coating and wetting.

For example, the method is designed in such a way that a metal-containing product, preferably a steel product, is heated at least indirectly by means of the primary heat transport fluid, which was heated by means of concentrated solar radiation, to a temperature in the temperature range between 100° C. and 750° C., preferably to a temperature in the temperature range is heated between 500°C and 750°C in, for example, a bell annealing furnace. A processing step here is a recrystallization of the metal-containing product. Steel hardens during cold rolling. This hardening is disadvantageous for further forming. The hardening is remedied by a heat treatment with the thermal energy obtained by concentrated solar radiation. During the heat treatment, the steel strip is heated so that the grains deformed by cold forming recrystallize and a new grain structure is formed.

For example, the method is designed in such a way that a metal-containing product, preferably a steel product (e.g. a steel strip) is at least indirectly heated to a temperature in the temperature range between 0° C. and 100° C. by means of the primary heat transport fluid, which was heated by means of concentrated solar radiation is heated to a temperature in the temperature range between 70°C and 80°C before it is electrolytically galvanized or tinned (processing step). For reasons of corrosion protection, steel is galvanized or tinned. For this purpose, in the electrolytic coating process, the coating is deposited on the surface by electrolytic deposition from a solution containing zinc or tin. In order to improve the electrical conductivity of the solution and to set a suitable temperature window with regard to the solubility of the metal ions, an increased bath temperature is sought. When cold strip enters the bath, it does so due to the high mass rate to a heat demand. This is avoided by preheating the strip.

For example, the method is designed in such a way that a product containing metal, preferably a metal strip (e.g. an aluminum strip or a steel strip) is at least indirectly heated to a temperature in the temperature range between 0°C and 300° by means of the primary heat transport fluid, which has been heated by means of concentrated solar radiation C, preferably to a temperature in the temperature range between 150°C and 250°C, in order to dry a paint applied to the surface in, for example, a flotation oven. Metal strips are coated with organic paints for various purposes in order to influence the optical appearance and/or the corrosion protection and/or the electrical insulation. The paint is applied to the strip in a liquid state. In order to obtain a clean and even paint surface, the paint must dry before it next comes into contact with other system parts (e.g. deflection rollers). The thermal energy required to heat the paint and strip is supplied at least indirectly by the primary heat transport fluid, which has been heated by means of concentrated solar radiation.

For example, the method is designed in such a way that a metal-containing product, preferably a heavy plate, is at least indirectly heated to a temperature in the temperature range between 0° C. and 1000° C., preferably to a temperature in the temperature range, by means of the primary heat transport fluid, which was heated by means of concentrated solar radiation between 700°C and 1000°C, for example in a heat treatment line. Microstructural processes take place as a result of the heating. A desired structure and thus the usage properties are then set by targeted cooling.

For example, the method is designed in such a way that a product containing metal, preferably aluminum scrap, is at least indirectly wiped to a temperature in the temperature range between 0° C. and 600° C., preferably to a temperature in the temperature range, by means of the primary heat transport fluid, which was heated by means of concentrated solar radiation 300°C and 600°C, for example in a heating and/or in a melting furnace. Aluminum scrap must be melted down before it can be processed again. In order to reduce the energy requirement for the actual melting, the scrap is at least indirectly preheated by means of the primary heat transport fluid.

For example, the method is designed in such a way that a product containing metal, preferably aluminum scrap, is at least indirectly wiped to a temperature in the temperature range between 0° C. and 750° C., preferably to a temperature in the temperature range, by means of the primary heat transport fluid, which was heated by means of concentrated solar radiation 650°C and 750°C, for example in a melting furnace. Scrap aluminum is melted down to produce aluminum that can be reused.

For example, the method is designed in such a way that a metal-containing product, preferably a semi-finished product containing aluminum, is heated at least indirectly by means of the primary heat transport fluid, which was heated by means of concentrated solar radiation, to a temperature in the temperature range between 100° C. and 600° C., preferably to a temperature in the temperature range between 500°C and 580°C. The metal-containing product is then reshaped, for example rolled.

For example, the method is designed in such a way that a metal-containing product, preferably an aluminum block, is at least indirectly heated to a temperature in the temperature range between 0° C. and 500° C., preferably to a temperature in the temperature range, by means of the primary heat transport fluid, which was heated by means of concentrated solar radiation between 450°C and 550°C. The metal-containing product, for example the aluminum block, is then reshaped, preferably extruded.

For example, the method is designed in such a way that a metal-containing product, preferably an aluminum product, is at least indirectly heated to a temperature in the temperature range between 0° C. and 500° C., preferably to a temperature in the temperature range, by means of the primary heat transport fluid, which was heated by means of concentrated solar radiation between 350°C and 450°C. The metal-containing product, preferably the aluminum product, is guided in a furnace, preferably without contact. During and after the heat treatment, strain hardening is eliminated and/or alloying components are dissolved and/or the formation of precipitates is promoted in a targeted manner. In this way, the structure of the aluminum product is specifically influenced.

For example, the method is designed in such a way that a metal-containing product, preferably copper pyrite, is at least indirectly heated to a temperature in the temperature range between 0° C. and 1300° C., preferably to a temperature in the temperature range, by means of the primary heat transport fluid, which has been heated by means of concentrated solar radiation is heated between 1100°C and 1200°C. Meanwhile, a conversion to copperstone takes place. Copper ore is converted into copper matte with oxygen so that it can be further processed. For this purpose, the ore that still contains iron is roasted, whereby the less noble iron is separated as an oxide and copper sulphide remains. This can then be reduced and further refined.

For example, the method is designed such that in the method step of transferring the thermal energy of the primary heat transport fluid to the metal-containing product, the thermal energy of the primary heat-transport fluid is not converted into electrical energy before being transferred to the metal-containing product.

As a result, the (concentrated) solar radiation is not converted into electrical energy (e.g. by means of solar cells) before the metal-containing product is heated. Furthermore, the heat energy of the primary heat transport fluid is not converted into electrical energy (for example by means of a generator) in order to then supply a heating device with the electrical energy.

The correspondingly designed method has the advantage that the primary heat transport fluid is heated more efficiently by the concentrated solar radiation. Consequently, the metal-containing product to be heated is also heated more efficiently, so that a larger quantity of metal-containing product can be heated by means of the available concentrated solar radiation.

Furthermore, for example, the method is designed in such a way that a partial flow of the primary heat transport fluid is diverted to generate electrical energy, with the electrical energy being generated, for example, by means of a generator. This electrical energy can be used to supply electrical energy to individual plant parts of a processing system.

The method is preferably designed in such a way that within a predetermined heating period before the metal-containing product is processed, thermal energy of the primary heat transport fluid obtained exclusively by means of concentrated solar radiation is transferred to the metal-containing product.

The method is preferably designed in such a way that at least one gas selected from the group consisting of carbon dioxide, steam, methane, ammonia, carbon monoxide, sulfur dioxide, sulfur trioxide, hydrochloric acid, nitrogen monoxide, nitrogen dioxide, nitrogen, air and mixtures thereof is used as the primary heat transport fluid .

It is also possible for the primary heat transport fluid to have or be a molten salt, with the molten salt having NaNO ₃ and/or KNO ₃ , for example. More preferably, the primary heat transfer fluid has a molten metal or is a molten metal. For example, the molten metal contains tin and/or zinc and/or aluminum and/or lead.

The method is preferably designed in such a way that the heating of the primary heat transport fluid is heated directly in a fluid heating device of a solar thermal system that is exposed to concentrated solar radiation.

For example, the primary heat transport fluid flows through the fluid heating device, in which the solar radiation reflected by reflectors is concentrated. The primary heat transport fluid interacts directly with the concentrated solar radiation and is heated by it.

The method is preferably designed in such a way that a primary heat transport fluid is used which has no solid components, in particular no ceramic components.

A gas, for example, can be used as the primary heat transport fluid. A primary heat transport fluid without solid components has the advantage that a transport device (e.g. pipes or a pipe system) for transporting the heat transport fluid is exposed to less wear. Furthermore, no solid components can be deposited in areas of the transport device in which there are lower transport speeds of the heat transport fluid.

In particular, it is particularly advantageous if the primary heat transport fluid does not transport any ceramic components, in particular no ceramic powder. Because ceramic components lead to a particularly high wear of the transport device.

The method preferably has a method step of transferring thermal energy of the primary heat transport fluid to a heat storage device and a method step of transferring thermal energy of the heat storage device to the metal-containing product.

The correspondingly trained method has the advantage that the thermal energy that won by means of the concentrated solar radiation NEN, can also be used in periods of time when no or comparatively little solar radiation is available. This enables the metal-containing product to be heated more evenly.

For example, the method is designed in such a way that the primary heat transport fluid is used to transfer heat energy from the heat storage device to the metal-containing product.

A reservoir of the primary heat transport fluid, for example, can serve as the heat storage device. Furthermore, for example, a heat transport fluid that differs from the primary heat transport fluid (for example a molten salt, for example containing NaNO ₃ and/or KNO ₃ ) can be used as a heat storage device. Furthermore, for example, a solid body can be used as the heat storage device. There are no restrictions with regard to the configuration of the solid body. The solid body can have, for example, stones and/or concrete and/or metal bodies or the like.

Furthermore, it is also within the meaning of the method according to the invention that thermal energy of the primary heat transport fluid is transferred to a secondary heat transport fluid and/or a tertiary heat transport fluid, with thermal energy of the secondary heat transport fluid and/or the tertiary heat transport fluid then being transferred to a heat storage device becomes. The heat energy of the primary heat transport fluid is thus transferred indirectly to the heat storage device.

A hot blast stove of a blast furnace can also be designed as a heat storage device. A correspondingly designed process enables a significant reduction in carbon dioxide emissions in the blast furnace process.

The method is preferably designed in such a way that the transfer of thermal energy from the primary heat transport fluid to the heat storage device takes place in a different time window than the transfer of thermal energy from the heat storage device to the metallic product. For example, the method is designed in such a way that the transfer of thermal energy from the primary heat transport fluid to the heat storage device takes place before the transfer of thermal energy from the heat storage device to the metallic product.

Preferably, the method comprises a step of transferring thermal energy of the primary heat transfer fluid to a secondary heat transfer fluid in a heat exchanger device and a step of transferring thermal energy of the secondary heat transfer fluid to the metal-containing product in a heating device.

The correspondingly designed method has the advantage that the thermal energy of the primary heat transport fluid can be used better for metal-containing products that are to be heated to a significantly lower temperature than a temperature of the primary heat transport fluid for further processing. Because the temperature of the secondary heat transfer fluid is lower than the temperature of the primary heat transfer fluid.

As already described above, the heat storage device can be heated by means of the secondary heat transport fluid. Furthermore, it is also possible for a first heat storage device to be heated by means of the primary heat transport fluid and for a second heat storage device to be heated by means of the secondary heat transport fluid. Consequently, the first heat storage device would be arranged in a primary fluid circuit and the second heat storage device in a secondary fluid circuit.

For example, the secondary heat transport fluid has a salt melt or is a salt melt, the salt melt having NaNO ₃ and/or KNO ₃ , for example. More preferably, the secondary heat transfer fluid has a molten metal or is a molten metal. For example, the molten metal contains tin and/or zinc and/or aluminum and/or lead.

The method is preferably designed in such a way that a heat transport fluid is used as the secondary heat transport fluid, the heat capacity of which is greater than the heat capacity of the primary heat transport fluid.

The correspondingly designed method has the advantage that the thermal energy obtained by means of concentrated solar radiation can be transported over greater distances with lower heat losses to a heating device by means of which the metal-containing product is to be heated.

The method is preferably designed in such a way that a heat transport fluid is used as the secondary heat transport fluid, the specific heat capacity of which is greater than the specific heat capacity of the primary heat transport fluid.

The method is preferably designed in such a way that a heat transfer fluid is used as the secondary heat transfer fluid, the density of which is greater than the density of the primary heat transfer fluid.

The method is preferably designed in such a way that a heat transfer fluid is used as the secondary heat transfer fluid whose product of specific heat capacity and density is greater than the product of the specific heat capacity and density of the primary heat transfer fluid.

The density of the respective heat transport fluid is to be understood as meaning its mass per unit volume.

The method preferably has a method step of transferring thermal energy of the primary heat transport fluid to a second secondary heat transport fluid in a second heat exchanger device, which is set up parallel to the heat exchanger device, so that thermal energy of the primary heat transport fluid is transferred in parallel to the secondary heat transport fluid and the second secondary -Heat transport fluid is transferred. Furthermore, the method has a method step of transferring thermal energy of the second secondary heat transport fluid to a second metal-containing product in a second heating device.

The correspondingly designed method has the advantage that different metal-containing products can also be heated to different temperatures in parallel before they are processed. The correspondingly designed method thus enables increased flexibility.

For example, the second secondary heat transport fluid has a salt melt or is a salt melt, the salt melt having NaNO ₃ and/or KNO ₃ , for example. More preferably, the second secondary heat transfer fluid has a molten metal or is a molten metal. For example, the molten metal contains tin and/or zinc and/or aluminum and/or lead.

A heat storage device as described above can be arranged in each of the fluid circuits, ie in the primary fluid circuit and in each of the secondary fluid circuits.

The method is preferably designed in such a way that a heat transport fluid is used as the second secondary heat transport fluid, the heat capacity of which is greater than the heat capacity of the primary heat transport fluid.

The method is preferably designed in such a way that a heat transfer fluid is used as the second secondary heat transfer fluid, the specific heat capacity of which is greater than the specific heat capacity of the primary heat transfer fluid.

The method is preferably designed in such a way that a heat transport fluid is used as the second secondary heat transport fluid, the density of which is greater than the density of the primary heat transport fluid.

The method is preferably designed such that a heat transfer fluid is used as the second secondary heat transfer fluid whose product of specific heat capacity and density is greater than the product of the specific heat capacity and density of the primary heat transfer fluid.

The method preferably has a method step of transporting the primary heat transport fluid to the heat exchanger device over a first route, thermal energy being transferred from the primary heat transport fluid to the secondary heat transport fluid in the heat exchanger device. The method further includes a step of transporting the secondary heat transfer fluid to the heating device over a second distance that is greater than the first distance, wherein thermal energy is transferred from the secondary heat transfer fluid to the metallic product in the heating device.

The correspondingly designed method enables efficient transport of the thermal energy generated by means of concentrated solar radiation over a large distance with low thermal energy losses. Consequently, the correspondingly designed method enables a fluid heating device, which is designed to heat a primary heat transport fluid by means of concentrated solar radiation, to be at a greater distance from the heating device in which the metal-containing product is heated by means of the energy obtained from concentrated solar radiation .

This is particularly advantageous when the concentrated solar radiation from a solar thermal system is used to heat the primary heat transfer fluid. A solar tower power plant has a fluid heating device that is arranged on a tower structure. The fluid heating device is also referred to as a receiver and/or as an absorber station and/or as a combustion chamber. A large number of reflector devices are arranged below the fluid heating device net, which are also referred to as heliostats, by means of which the solar radiation is reflected onto the fluid heating device. The reflector devices occupy a large area around the tower structure, so that a heating device for heating the metalliferous product can usually be placed outside an area in which the reflector devices are arranged. Consequently, the method described enables the distance between the fluid heating device and the heating device for heating the metal-containing product to be increased.

The first distance is preferably shorter than 1000 meters. More preferably, the first distance is shorter than 800 meters. More preferably, the first distance is shorter than 600 meters. More preferably, the first distance is shorter than 400 meters. More preferably, the first distance is shorter than 200 meters.

The first distance is preferably between 100 meters and 1000 meters. More preferably, the first distance is between 110 meters and 900 meters. More preferably, the first distance is between 120 meters and 800 meters. More preferably, the first distance is between 130 meters and 700 meters. More preferably, the first distance is between 140 meters and 600 meters. More preferably, the first distance is between 150 meters and 500 meters. More preferably, the first distance is between 160 meters and 400 meters. More preferably, the first distance is between 170 meters and 300 meters. More preferably, the first distance is between 180 meters and 200 meters.

The method preferably has a method step of transporting the primary heat transport fluid to the second heat exchanger device via a third route, thermal energy being transferred from the primary heat transport fluid to the second secondary heat transport fluid in the second heat exchanger device. Furthermore, the method has a step of transporting the second secondary heat transport fluid to the heating device over a fourth path that is greater than the third path, wherein thermal energy is transferred from the second secondary heat transport fluid to the second metal-containing product in the heating device.

The correspondingly designed method enables efficient transport of the thermal energy generated by means of concentrated solar radiation over a large distance with low thermal energy losses. Consequently, the correspondingly designed method enables a fluid heating device, which is designed to heat a primary heat transport fluid by means of concentrated solar radiation, to be at a greater distance from the heating device in which the metal-containing product is heated by means of the energy obtained from concentrated solar radiation .

This is particularly advantageous when the concentrated solar radiation from a solar thermal system is used to heat the primary heat transfer fluid. A solar thermal system has a fluid heating device that is arranged on a tower structure. The fluid heating device is also referred to as a receiver and/or as an absorber station and/or as a combustion chamber. Below the fluid heating device, a large number of reflector devices are arranged, which are also referred to as heliostats, by means of which the solar radiation is reflected onto the fluid heating device. The reflector devices occupy a large area around the tower structure, so that a heating device for heating the metalliferous product can usually be placed outside an area in which the reflector devices are arranged. Consequently, the method described enables the distance between the fluid heating device and the heating device for heating the metal-containing product to be increased.

The third distance is preferably shorter than 1000 meters. More preferably, the third distance is shorter than 800 meters. More preferably, the third distance is shorter than 600 meters. More preferably, the third distance is shorter than 400 meters. More preferably, the third distance is shorter than 200 meters.

The third distance is preferably between 100 meters and 1000 meters. More preferably, the third distance is between 110 meters and 900 meters. More preferably, the third distance is between 120 meters and 800 meters. More preferably, the third distance is between 130 meters and 700 meters. More preferably, the third distance is between 140 meters and 600 meters. More preferably, the third distance is between 150 meters and 500 meters. More preferably, the third distance is between 160 meters and 400 meters. More preferably, the third distance is between 170 meters and 300 meters. More preferably, the third distance is between 180 meters and 200 meters.

Preferably, the method includes a step of transferring thermal energy from the secondary heat transfer fluid to a tertiary heat transfer fluid in a third heat exchanger device and a method step of transferring thermal energy of the tertiary heat transport fluid to the metal-containing product in a third heating device.

For example, a gas selected from the group consisting of carbon dioxide, water vapor, methane, ammonia, carbon monoxide, sulfur dioxide, sulfur trioxide, hydrochloric acid, nitrogen monoxide, nitrogen dioxide, nitrogen, air and mixtures thereof is used as the tertiary heat transport fluid.

For example, the tertiary heat transport fluid has a molten salt or is a molten salt, for example containing NaNO ₃ and/or KNO ₃ .

More preferably, the tertiary heat transfer fluid has a molten metal or is a molten metal. For example, the molten metal contains tin and/or zinc and/or aluminum and/or lead.

The method is preferably designed in such a way that a heat transport fluid is used as the tertiary heat transport fluid, the heat capacity of which differs from the heat capacity of the secondary heat transport fluid.

More preferably, the method is designed in such a way that a heat transfer fluid is used as the tertiary heat transfer fluid, the specific heat capacity of which differs from the specific heat capacity of the secondary heat transfer fluid.

More preferably, the method is designed in such a way that a heat transfer fluid is used as the tertiary heat transfer fluid, the density of which differs from the thermal capacity of the secondary heat transfer fluid.

More preferably, the method is designed such that a heat transfer fluid is used as the tertiary heat transfer fluid, the heat capacity and/or the density of which is smaller than the heat capacity and/or the density of the secondary heat transfer fluid.

More preferably, the method is designed in such a way that a heat transfer fluid is used as the tertiary heat transfer fluid, the heat capacity and/or the density of which is greater than the heat capacity of the secondary heat transfer fluid.

The present invention is also based on the object of providing a processing system for heating and further processing of at least one metal-containing product, by means of which, compared to processing systems known from the prior art, a significant reduction in the emission of greenhouse gases and in particular a reduction in the emission of carbon dioxide is realized.

This object on which the present invention is based is achieved by a processing system having the features specified in claim 10 . Developments of the processing system are described in the claims dependent on claim 10.

More precisely, the object on which the present invention is based is achieved by a processing system for heating and further processing at least one metal-containing product, the at least one metal-containing product being a metal-containing semi-finished product and/or scrap and/or sponge iron and/or HBI, the processing system has a fluid heating device which is designed to heat a primary heat transport fluid by means of concentrated solar radiation, and has a heating device which is designed to transfer heat from the primary heat transport fluid at least indirectly to the metal-containing product, and a processing device for processing the heated has metal-containing product.

The processing system according to the invention has the advantage that significantly less energy, and possibly no energy that is obtained from fossil fuels or by means of nuclear power, is required for heating and further processing a metal-containing product. As a result, significantly less and possibly no carbon dioxide is generated during the heating and subsequent further processing of a metal-containing product.

Due to the use of concentrated solar radiation and thus due to the use of solar thermal energy, the processing system according to the invention has a high degree of efficiency with regard to the energy portion of the solar radiation used for heating. Due to the use of concentrated solar radiation, in the region of or more than 30% of the radiant energy of the concentrated solar radiation can be used for heating a metallic product. This efficiency is considerably higher than when using photovoltaics. When using photovoltaics, sunlight is used to generate electrical energy, with photovoltaic modules that can be used on an industrial scale having an efficiency of around 25%. As a result, only 25% of the energy in solar radiation is converted into electrical energy del. This electrical energy still has to be converted into thermal energy, which further reduces the overall efficiency until the metal-containing product is heated.

The fluid heating device is, for example, part of a solar thermal system and is arranged on a tower which is arranged in an array of heliostats which reflect solar radiation into/onto the fluid heating device. It is also possible for the fluid heating device to be arranged at the focal point of a reflecting parabolic trough or at the focal point of a Fresnel mirror arrangement or at the focal point of a Fresnel lens arrangement, so that solar radiation reflected by the parabolic trough or by the Fresnel mirror arrangement or solar radiation collected by the Fresnel lens arrangement are absorbed by the primary heat transport fluid can.

The heating device is designed as an oven, for example. An oven is to be understood as a device that can heat a given area of space to a higher temperature than a room area adjacent to the given area of space. For example, the furnace is designed as a melting furnace, or as a tunnel furnace, or as a reheating furnace, or as an annealing furnace, or as a top hat furnace, or as a heat treatment line, or as a flash smelting furnace. For example, the heat transfer fluid flows through the oven. According to the invention, there are no restrictions whatsoever with regard to the design of the furnace.

The metal-containing product can be any product that is designed as a metal-containing semi-finished product and/or scrap and/or sponge iron and/or HBI and contains at least one metal (e.g. iron, copper, aluminum, nickel, tin, or at least one of these Metals having alloy) has. When the metal-containing product is formed as a semi-finished product comprising metal, it may be formed, for example, as a slab or a billet, etc. Sponge iron is also known as DRI (English abbreviation for Direct Reduced Iron). Sponge iron is also known as HBI (English abbreviation for hot briquetted iron).

The processing facility is designed, for example, as a forming facility (e.g. rolling facility) and/or as a reactor for chemical modification (e.g. reduction of iron) and/or as a facility for changing the material structure (e.g. changing a microstructure of the metal-containing product, tempering, annealing, melting, etc. ), or the like.

The processing system is preferably designed to heat the primary heat transport fluid by means of the concentrated solar radiation to a temperature in the range between 500° C. and 1700° C., preferably in the range between 700° C. and 1700° C., more preferably in the range between 800° C. and 1650°C, more preferably in the range between 900°C and 1650°C, more preferably in the range between 900°C and 1600°C, more preferably in the range between 1100°C and 1650°C, more preferably in the range between 1200° C to 1600°C, more preferably in the range between 1300°C and 1600°C, more preferably in the range between 1400°C and 1550°C, more preferably in the range between 1400°C and 1500°C.

For example, the processing system is designed in such a way that the primary heat transport fluid is heated to a temperature in the range between 1500° C. and 1600° C., more preferably to 1550° C., by means of concentrated solar radiation. This temperature range is particularly suitable for melting scrap and/or directly reduced iron.

For example, the processing system is designed in such a way that the primary heat transfer fluid is heated to a temperature in the range between 600° C. and 850° C. by means of concentrated solar radiation. This temperature range is particularly suitable for preheating scrap and/or direct reduced iron.

For example, the processing system is designed in such a way that the primary heat transport fluid is heated to a temperature in the range between 1150° C. and 1250° C., more preferably to 1200° C., by means of concentrated solar radiation. This temperature range is particularly suitable for reheating slabs and/or billets or other ferrous semi-finished products before further processing.

For example, the processing system is designed in such a way that the primary heat transport fluid is heated to a temperature in the range between 600° C. and 700° C., more preferably to 650° C., by means of concentrated solar radiation. This temperature range is particularly suitable for tempering and annealing slabs and/or billets or other ferrous semi-finished products.

For example, the processing system is designed in such a way that the primary heat transport fluid is heated to a temperature in the range between 700° C. to 800° C., more preferably to 750° C., by means of concentrated solar radiation. This temperature range is particularly suitable for continuous annealing of slabs and/or billets or other ferrous semi-finished products.

The processing system is preferably designed in such a way that at least one gas selected from the group consisting of carbon dioxide, steam, methane, ammonia, carbon monoxide, sulfur dioxide, sulfur trioxide, hydrochloric acid, nitrogen monoxide, nitrogen dioxide, nitrogen, air and mixtures thereof is used as the primary heat transport fluid .

It is also possible for the primary heat transport fluid to have or be a molten salt, with the molten salt having NaNO ₃ and/or KNO ₃ , for example. More preferably, the primary heat transfer fluid has a molten metal or is a molten metal. For example, the molten metal contains tin and/or zinc and/or aluminum and/or lead.

The processing system is preferably designed in such a way that the heating of the primary heat transport fluid is heated directly in a fluid heating device of a solar thermal system that is exposed to concentrated solar radiation.

For example, the primary heat transport fluid flows through the fluid heating device, in which the solar radiation reflected by reflectors is concentrated. The primary heat transport fluid interacts directly with the concentrated solar radiation and is heated by it.

The processing system is preferably designed in such a way that a primary heat transport fluid is used which has no solid components, in particular no ceramic components.

A gas, for example, can be used as the primary heat transport fluid. A primary heat transport fluid without solid components has the advantage that a transport device (e.g. pipes or a pipe system) for transporting the heat transport fluid is exposed to less wear. Furthermore, no solid components can be deposited in areas of the transport device in which there are lower transport speeds of the heat transport fluid.

In particular, it is particularly advantageous if the primary heat transport fluid does not transport any ceramic components, in particular no ceramic powder. Because ceramic components lead to a particularly high wear of the transport device.

The heating device and processing device can be implemented as an integral device, for example in an industrial plant.

The heating device can be designed in such a way that the primary heat transport fluid is transported through the heating device, with the heating device transferring the thermal energy thus obtained to the metal-containing product (for example by means of thermal radiation).

Furthermore, the heating device can be designed in such a way that the primary heat transport fluid can interact and/or be brought into direct contact with the metal-containing product in order to transfer the heat energy to the metal-containing product.

The processing system is preferably designed in such a way that it has a heat storage device, with the processing system being designed to transfer thermal energy of the primary heat transport fluid at least indirectly to the heat storage device.

The correspondingly designed processing system has the advantage that the thermal energy that is obtained by means of the concentrated solar radiation can also be used in periods of time in which there is no or comparatively little solar radiation available. This enables the metal-containing product to be heated more evenly.

For example, the processing system is designed in such a way that the primary heat transport fluid is used to transfer heat energy from the heat storage device to the metal-containing product.

A reservoir of the primary heat transport fluid, for example, can serve as the heat storage device. Furthermore, for example, a heat transport fluid that differs from the primary heat transport fluid (for example a molten salt, for example containing NaNO ₃ and/or KNO ₃ ) can be used as a heat storage device. Furthermore, for example, a solid body can be used as the heat storage device. There are no restrictions with regard to the configuration of the solid body. The solid body can have, for example, stones and/or concrete and/or metal bodies or the like.

Furthermore, it is also within the meaning of the processing system according to the invention that heat energy of the primary heat transfer fluid is transferred to a secondary heat transfer fluid and/or to a tertiary heat transfer fluid, with then thermal energy of the secondary heat transfer fluid and/or the tertiary heat transfer fluid is transferred to a heat storage device. The heat energy of the primary heat transport fluid is thus transferred indirectly to the heat storage device.

A hot blast stove of a blast furnace can also be designed as a heat storage device. A correspondingly designed process enables a significant reduction in carbon dioxide emissions in the blast furnace process.

The processing system is preferably designed in such a way that it has a heat exchanger device, by means of which thermal energy of the primary heat transport fluid can be transferred to a secondary heat transport fluid, and the heating device is designed to transfer heat from the secondary heat transport fluid at least indirectly to the metal-containing product.

The correspondingly designed processing system has the advantage that the thermal energy of the primary heat transport fluid can be used better for metal-containing products that are to be heated to a significantly lower temperature than a temperature of the primary heat transport fluid for further processing. Because the temperature of the secondary heat transfer fluid is lower than the temperature of the primary heat transfer fluid.

As already described above, the heat storage device can be heated by means of the secondary heat transport fluid. Furthermore, it is also possible for a first heat storage device to be heated by means of the primary heat transport fluid and for a second heat storage device to be heated by means of the secondary heat transport fluid. Consequently, the first heat storage device would be arranged in a primary fluid circuit and the second heat storage device in a secondary fluid circuit.

For example, the secondary heat transport fluid has a salt melt or is a salt melt, the salt melt having NaNO ₃ and/or KNO ₃ , for example. More preferably, the secondary heat transfer fluid has a molten metal or is a molten metal. For example, the molten metal contains tin and/or zinc and/or aluminum and/or lead.

The heating device can be designed in such a way that the secondary heat transport fluid is transported through the heating device, with the heating device transferring the thermal energy thus obtained to the metal-containing product (for example by means of thermal radiation).

Furthermore, the heating device can be designed in such a way that the secondary heat transport fluid can interact and/or be brought into direct contact with the metal-containing product in order to transfer the heat energy to the metal-containing product.

The processing system preferably has a second heat exchanger device, which is set up parallel to the heat exchanger device, so that thermal energy of the primary heat transport fluid can be transferred in parallel to the secondary heat transport fluid by means of the heat exchanger device and to the second secondary heat transport fluid by means of the second heat exchanger device. Furthermore, the processing system has a second heating device, which is designed to transfer heat from the second secondary heat transport fluid at least indirectly to a second metal-containing product.

The correspondingly designed processing system has the advantage that different metal-containing products can also be heated to different temperatures in parallel before they are processed. The correspondingly designed processing system thus enables increased flexibility.

For example, the second secondary heat transport fluid has a salt melt or is a salt melt, the salt melt having NaNO ₃ and/or KNO ₃ , for example. More preferably, the second secondary heat transfer fluid has a molten metal or is a molten metal. For example, the molten metal contains tin and/or zinc and/or aluminum and/or lead.

A heat storage device as described above can be arranged in each of the fluid circuits, ie in the primary fluid circuit and in each of the secondary fluid circuits.

The processing system is preferably designed in such a way that a heat transport fluid is used as the second secondary heat transport fluid, the heat capacity of which is greater than the heat capacity of the primary heat transport fluid.

The processing system is preferably designed in such a way that a heat transfer fluid is used as the second secondary heat transfer fluid, the density of which is greater than the density of the primary heat transfer fluid.

The processing system is preferably designed in such a way that a heat transfer fluid is used as the second secondary heat transfer fluid, the product of specific heat capacity and density of which is greater than the product of the specific heat capacity and density of the primary heat transfer fluid.

The second heating device can be designed in such a way that the second secondary heat transport fluid is transported through the second heating device, with the second heating device transferring the thermal energy thus obtained to the second metal-containing product (for example by means of thermal radiation).

Furthermore, the second heating device can be designed in such a way that the second secondary heat transport fluid can interact and/or be brought into direct contact with the second metal-containing product in order to transfer the thermal energy to the second metal-containing product.

The processing system is preferably designed in such a way that the fluid heating device is thermally coupled to the heat exchanger device by means of the primary heat transport fluid circulating in a primary fluid circuit, with the heat exchanger device being thermally coupled to the heating device by means of the secondary heat transport fluid circulating in a secondary fluid circuit, with a primary - The fluid feed line of the primary fluid circuit, via which the primary heat transport fluid is transported from the fluid heating device in the direction of the heat exchanger device, has a first length, and a secondary fluid feed line of the secondary fluid circuit, via which the secondary heat transport fluid is transported from the heat exchanger device in the direction transported by the heater has a second length that is greater than the first length.

The appropriately designed processing system enables efficient transport of the thermal energy generated by means of concentrated solar radiation over a large distance with low thermal energy losses. Consequently, the appropriately configured processing system allows a fluid heater configured to heat a primary heat transfer fluid by means of concentrated solar radiation to be at a greater distance from the heater in which the metalliferous product is heated by means of the energy obtained from concentrated solar radiation .

This is particularly advantageous when the concentrated solar radiation from a solar tower power plant is used to heat the primary heat transfer fluid. A solar tower power plant has a fluid heating device that is arranged on a tower structure. The fluid heating device is also referred to as a receiver and/or as an absorber station and/or as a combustion chamber. Below the fluid heating device, a large number of reflector devices are arranged, which are also referred to as heliostats, by means of which the solar radiation is reflected onto the fluid heating device. The reflector devices occupy a large area around the tower structure, so that a heating device for heating the metalliferous product can usually be placed outside an area in which the reflector devices are arranged. Consequently, the processing system described allows for an increase in the distance from the fluid heater to the heater for heating the metalliferous product.

Preferably the first length is less than 1000 meters. More preferably, the first length is less than 800 meters. More preferably, the first length is less than 600 meters. More preferably, the first length is less than 400 meters. More preferably, the first length is less than 200 meters.

The first length is preferably between 100 meters and 1000 meters. More preferably, the first length is between 110 meters and 900 meters. More preferably, the first length is between 120 meters and 800 meters. More preferably, the first length is between 130 meters and 700 meters. More preferably, the first length is between 140 meters and 600 meters. More preferably, the first length is between 150 meters and 500 meters. More preferably, the first length is between 160 meters and 400 meters. More preferably, the first length is between 170 meters and 300 meters. More preferably, the first length is between 180 meters and 200 meters.

The processing system is preferably designed in such a way that the fluid heating device is heat-coupled to the second heat-exchanger device by means of the primary heat-transport fluid circulating in a primary fluid circuit, with the second heat-exchanger device being heat-coupled to a second heating device by means of the second secondary heat-transport fluid circulating in a second secondary fluid circuit is, wherein a primary fluid feed line of the primary fluid circuit, via which the primary heat transport fluid is transported from the fluid heating device in the direction of the second heat exchanger device, has a third length, and wherein a second secondary fluid feed line of the second secondary fluid circuit, via which the second secondary heat transport fluid is transported from the second heat exchanger device in the direction of the second heating device, has a fourth length that is greater than the third length.

The correspondingly designed processing system has the advantage that different metal-containing products can also be heated to different temperatures in parallel before they are processed. The correspondingly designed processing system thus enables increased flexibility.

For example, the second secondary heat transport fluid has a salt melt or is a salt melt, the salt melt having NaNO ₃ and/or KNO ₃ , for example. More preferably, the second secondary heat transfer fluid has a molten metal or is a molten metal. For example, the molten metal contains tin and/or zinc and/or aluminum and/or lead.

A heat storage device as described above can be arranged in each of the fluid circuits, ie in the primary fluid circuit and in each of the secondary fluid circuits.

The processing system is preferably designed in such a way that a heat transport fluid is used as the second secondary heat transport fluid, the heat capacity of which is greater than the heat capacity of the primary heat transport fluid.

The processing system is preferably designed in such a way that a heat transfer fluid is used as the second secondary heat transfer fluid, the density of which is greater than the density of the primary heat transfer fluid.

The processing system is preferably designed in such a way that a heat transfer fluid is used as the second secondary heat transfer fluid, the product of specific heat capacity and density of which is greater than the product of the specific heat capacity and density of the primary heat transfer fluid.

Preferably, the third length is less than 1000 meters. More preferably, the third length is less than 800 meters. More preferably, the third length is less than 600 meters. More preferably, the third length is less than 400 meters. More preferably, the third length is less than 200 meters.

The third length is preferably between 100 meters and 1000 meters. More preferably, the third length is between 110 meters and 900 meters. More preferably, the third length is between 120 meters and 800 meters. More preferably, the third length is between 130 meters and 700 meters. More preferably, the third length is between 140 meters and 600 meters. More preferably, the third length is between 150 meters and 500 meters. More preferably, the third length is between 160 meters and 400 meters. More preferably, the third length is between 170 meters and 300 meters. More preferably, the third length is between 180 meters and 200 meters.

The processing system preferably has a third heat exchanger device, by means of which thermal energy of the secondary heat transport fluid can be transferred to a tertiary heat transport fluid, the heating device being designed to transfer heat of the tertiary heat transport fluid at least indirectly to the metal-containing product.

For example, a gas selected from the group consisting of carbon dioxide, water vapor, methane, ammonia, carbon monoxide, sulfur dioxide, sulfur trioxide, hydrochloric acid, nitrogen monoxide, nitrogen dioxide, nitrogen, air and mixtures thereof is used as the tertiary heat transport fluid.

For example, the tertiary heat transport fluid has a molten salt or is a molten salt, for example containing NaNO ₃ and/or KNO ₃ .

More preferably, the tertiary heat transfer fluid has a molten metal or is a molten metal. For example, the molten metal contains tin and/or zinc and/or aluminum and/or lead.

The processing system is preferably designed in such a way that a heat transport fluid is used as the tertiary heat transport fluid, the heat capacity of which differs from the heat capacity of the secondary heat transport fluid.

More preferably, the processing system is designed in such a way that a heat transfer fluid is used as the tertiary heat transfer fluid, the density of which differs from the heat capacity of the secondary heat transfer fluid.

More preferably, the processing system is designed in such a way that a heat transfer fluid is used as the tertiary heat transfer fluid, the heat capacity and/or the density of which is smaller than the heat capacity of the secondary heat transfer fluid.

More preferably, the processing system is designed in such a way that a heat transfer fluid is used as the tertiary heat transfer fluid, the heat capacity and/or the density of which is greater than the heat capacity of the secondary heat transfer fluid.

• 1: zeigt ein Verfahrensablaufdiagramm eines erfindungsgemäßen Verfahrens zum Erwärmen und Weiterverarbeiten eines metallhaltigen Produkts unter Verwendung von konzentrierter Sonnenstrahlung;
• 2: zeigt ein Verfahrensablaufdiagramm einer weiteren Ausführungsform des erfindungsgemäßen Verfahrens zum Erwärmen und Weiterverarbeiten eines metallhaltigen Produkts unter Verwendung von konzentrierter Sonnenstrahlung;
• 3: zeigt ein Verfahrensablaufdiagramm einer nochmals weiteren Ausführungsform des erfindungsgemäßen Verfahrens zum Erwärmen und Weiterverarbeiten eines metallhaltigen Produkts unter Verwendung von konzentrierter Sonnenstrahlung;
• 4: zeigt ein Verfahrensablaufdiagramm einer nochmals weiteren Ausführungsform des erfindungsgemäßen Verfahrens zum Erwärmen und Weiterverarbeiten eines metallhaltigen Produkts unter Verwendung von konzentrierter Sonnenstrahlung;
• 5: zeigt ein Verfahrensablaufdiagramm einer nochmals weiteren Ausführungsform des erfindungsgemäßen Verfahrens zum Erwärmen und Weiterverarbeiten eines metallhaltigen Produkts unter Verwendung von konzentrierter Sonnenstrahlung;
• 6: zeigt einen schematischen Aufbau eines Verarbeitungssystems zum Erwärmen und zum Weiterverarbeiten von zumindest einem metallhaltigen Produkt unter Verwendung von konzentrierter Sonnenstrahlung;
• 7: zeigt einen schematischen Aufbau eines Verarbeitungssystems zum Erwärmen und zum Weiterverarbeiten von zumindest einem metallhaltigen Produkt unter Verwendung von konzentrierter Sonnenstrahlung gemäß einer weiteren Ausführungsform der vorliegenden Erfindung;
• 8: zeigt einen schematischen Aufbau eines Verarbeitungssystems zum Erwärmen und zum Weiterverarbeiten von zumindest einem metallhaltigen Produkt unter Verwendung von konzentrierter Sonnenstrahlung gemäß einer nochmals weiteren Ausführungsform der vorliegenden Erfindung;
• 9: zeigt einen schematischen Aufbau eines Verarbeitungssystems zum Erwärmen und zum Weiterverarbeiten von zumindest einem metallhaltigen Produkt unter Verwendung von konzentrierter Sonnenstrahlung gemäß einer nochmals weiteren Ausführungsform der vorliegenden Erfindung;
• 10: zeigt einen schematischen Aufbau eines Verarbeitungssystems zum Erwärmen und zum Weiterverarbeiten von zumindest einem metallhaltigen Produkt unter Verwendung von konzentrierter Sonnenstrahlung gemäß einer nochmals weiteren Ausführungsform der vorliegenden Erfindung; und
• 11: zeigt einen schematischen Aufbau eines Verarbeitungssystems zum Erwärmen und zum Weiterverarbeiten von zumindest einem metallhaltigen Produkt unter Verwendung von konzentrierter Sonnenstrahlung gemäß einer nochmals weiteren Ausführungsform der vorliegenden Erfindung.

Further advantages, details and features of the invention result from the exemplary embodiments explained below. Show in detail:

• 1 : shows a process flow diagram of a method according to the invention for heating and further processing a metal-containing product using concentrated solar radiation;
• 2 FIG. 1: shows a process flow diagram of a further embodiment of the method according to the invention for heating and further processing a metal-containing product using concentrated solar radiation;
• 3 FIG. 1: shows a process flow diagram of yet another embodiment of the method for heating and further processing a metalliferous product using concentrated solar radiation according to the invention;
• 4 FIG. 1: shows a process flow diagram of yet another embodiment of the method for heating and further processing a metalliferous product using concentrated solar radiation according to the invention;
• 5 FIG. 1: shows a process flow diagram of yet another embodiment of the method for heating and further processing a metalliferous product using concentrated solar radiation according to the invention;
• 6 : shows a schematic structure of a processing system for heating and further processing of at least one metal-containing product using concentrated solar radiation;
• 7 : shows a schematic structure of a processing system for heating and further processing of at least one metal-containing product using concentrated solar radiation according to a further embodiment of the present invention;
• 8th 1: shows a schematic structure of a processing system for heating and for further processing of at least one metal-containing product using concentrated solar radiation according to yet another embodiment of the present invention;
• 9 1: shows a schematic structure of a processing system for heating and for further processing of at least one metal-containing product using concentrated solar radiation according to yet another embodiment of the present invention;
• 10 1: shows a schematic structure of a processing system for heating and for further processing of at least one metal-containing product using concentrated solar radiation according to yet another embodiment of the present invention; and
• 11 1: shows a schematic structure of a processing system for heating and for further processing of at least one metal-containing product using concentrated solar radiation according to yet another embodiment of the present invention.

In the description that now follows, the same reference symbols denote the same components or the same features, so that a description of a component carried out with reference to one figure also applies to the other figures, so that a repeated description is avoided. Furthermore, individual features that have been described in connection with one embodiment can also be used separately in other embodiments.

1 shows a process flow diagram of a method according to the invention for heating and further processing a metal-containing product M1, M2 using concentrated solar radiation. The procedure can be based on any of the 6 until 11 illustrated processing systems for heating and for further processing of at least one metal-containing product M1, M2 are performed using concentrated solar radiation.

In a method step S1, a primary heat transport fluid HTF1 is heated using concentrated solar radiation. For this purpose, a processing system 1 for heating and further processing at least one metal-containing product M1 has a fluid heating device 3 which is designed to heat the primary heat transport fluid HTF1 using concentrated solar radiation.

In the in the 6 until 11 illustrated embodiments of the processing system 1 the fluid heating device 3 is designed as an absorber station 3, in which solar radiation SR emitted by the sun S is concentrated. For this purpose, the solar radiation SR is reflected onto/into the fluid heating device 3 by reflection devices 2 designed as heliostats 2 . The primary heat transport fluid HTF1 runs through the fluid heating device 3 and is thus heated by the concentrated solar radiation SR.

The processing system 1 also has a heating device 41 which is designed to transfer heat from the primary heat transport fluid HTF1 at least indirectly to the metal-containing product M1 in accordance with a method step S11, which is arranged in the heating device 41 in the illustrated exemplary embodiments. For this purpose, the primary heat transport fluid HTF1 circulates between the fluid heating device 3 and the heating device 41.

Furthermore, the processing system 1 has a processing device 50 in which a method step SP for processing the heated metal-containing product M1 is carried out. In the exemplary embodiments shown, the heating devices and the processing devices are always shown in combination and combined in one industrial plant.

This in 7 The processing system 1 shown is designed to carry out the method whose method flowchart is shown in 2 is shown. This in 7 The processing system 1 shown differs from that in 6 Processing system 1 shown in that it has a heat storage device 30, wherein in a method step S1S thermal energy of the primary heat transport fluid HTF1 is transferred at least indirectly to the heat storage device 30. A heat storage medium 31, which preferably has a large heat capacity, is arranged in the heat storage device 30. However, the primary heat transport fluid 1 can also function as a heat storage medium 31 . The heat storage device 30 in turn is thermally coupled to the heating device 41 by a heat transport fluid circulating between the heat storage device 30 and the heating device 41 . In the exemplary embodiment shown, the primary heat transport fluid HTF1 circulates between the heat storage device 30 and the heating device 41, so that, according to a method step SS1, thermal energy from the heat storage device 30 is transferred to the metal-containing product M1.

This in 8th The processing system 1 shown is designed to carry out the method whose method flowchart is shown in 3 is shown. This in 8th The processing system 1 shown differs from that in 7 Processing system 1 illustrated in that the processing system 1 has a heat exchanger device 60, by means of which thermal energy of the primary heat transport fluid HTF1 can be transferred to a secondary heat transport fluid HTF2 in a method step S12. For this purpose, the fluid heating device 3 is thermally coupled to the heat exchanger device 60 by means of the primary heat transport fluid (HTF1) circulating in a primary fluid circuit 10 . The heating device 41 is designed to transfer heat from the secondary heat transport fluid HTF2 at least indirectly to the metal-containing product M1 in a method step S21. For this purpose, the heat exchanger device 60 is thermally coupled to the heating device 41 by means of the secondary heat transport fluid HTF2 circulating in a secondary fluid circuit 20 .

This in 9 The processing system 1 shown differs from that in 8th Processing system 1 shown in that it has no heat storage device 30 which is arranged between the fluid heating device 3 and the heat exchanger device 60 . However, that can 9 Processing system 1 shown also have the heat storage device 30 which is arranged between the fluid heating device 3 and the heat exchanger device 60 .

Out of 9 It can be seen that a primary fluid supply line 11 of the primary fluid circuit 10, via which the primary heat transport fluid HTF1 is transported from the fluid heating device 3 in the direction of the heat exchanger device 60, has a first length L1. Furthermore is off 9 It can be seen that a secondary fluid supply line 21 of the secondary fluid circuit 20, via which the secondary heat transport fluid HTF2 is transported from the heat exchanger device 60 in the direction of the heating device 41, has a second length L2 that is greater than the first length L1.

Consequently, the primary heat transport fluid HTF1 is transported to the heat exchanger device 60 over a first route L1, with thermal energy being transferred from the primary heat transport fluid HTF1 to the secondary heat transport fluid HTF2 in the heat exchanger device 60 . Furthermore, the secondary heat transport fluid HTF2 is transported to the heating device 41 over a second distance L2, which is greater than the first distance L1, wherein in the heating device 41 heat energy from the Secondary heat transfer fluid HTF2 is transferred to the metallic product M1.

A heat transport fluid is preferably used as the secondary heat transport fluid HTF2, the heat capacity of which is greater than the heat capacity of the primary heat transport fluid HTF1. More preferably, a heat transfer fluid is used as the secondary heat transfer fluid HTF2, the specific heat capacity of which is greater than the specific heat capacity of the primary heat transfer fluid HTF1. More preferably, a heat transfer fluid is used as the secondary heat transfer fluid HTF2, the density of which is greater than the density of the primary heat transfer fluid HTF1. More preferably, a heat transfer fluid is used as the secondary heat transfer fluid HTF2, the product of its density and its thermal capacity being greater than the product of the density and the thermal capacity of the primary heat transfer fluid HTF1.

The processing systems 1 in the 10 and 11 are shown can be designed accordingly, so that with reference to 9 described length ratios of the first lengths L1 of the primary fluid supply lines 11 and the second lengths L2 of the secondary fluid supply lines 21 also in the case of the 10 and 11 illustrated embodiments of the processing systems 1 can be realized.

This in 10 The processing system 1 shown is designed to carry out the method whose method flowchart is shown in 4 is shown. This in 10 The processing system 1 shown differs from that in 8th illustrated processing system 1 in that the processing system 1 has a second heat exchanger device 70, which is set up parallel to the heat exchanger device 60, so that, according to method step S12, thermal energy of the primary heat transport fluid HTF1 is transferred in parallel by means of the heat exchanger device 60 to the secondary heat transport fluid HTF2 and according to a method step S122 can be transferred to the second secondary heat transport fluid HTF22 by means of the second heat exchanger device 70 . Furthermore, the in 10 The processing system 1 shown has a second heating device 42 which is designed to transfer heat from the second secondary heat transport fluid HTF22 at least indirectly to a second metal-containing product M2 in accordance with a method step S221.

Out of 10 It is also evident that a further feed line and a further discharge line for the transport of the primary heat transport fluid can be provided in the heat storage device 30 . In this way, for example, a heating device can be supplied directly by means of the primary heat transport fluid HTF1. Furthermore, a power generation device could be supplied with heat from the primary heat transport fluid HTF1 via the additional feed line and a further discharge line.

Although in 10 Not shown, this embodiment can also be designed such that a primary fluid supply line 11 of a primary fluid circuit 10, via which the primary heat transport fluid HTF1 is transported from the fluid heating device 3 in the direction of the second heat exchanger device 70, has a third length L3, with a second secondary fluid supply line 212 of a second secondary fluid circuit 202, via which the second secondary heat transport fluid HTF22 is transported from the second heat exchanger device 70 in the direction of the second heating device 42, 43, has a fourth length L4, which is greater than the third length L3 .

Consequently, the primary heat transport fluid HTF1 is transported to the second heat exchanger device 70 via a third route L3, with thermal energy being transferred from the primary heat transport fluid HTF1 to the second secondary heat transport fluid HTF22 in the second heat exchanger device 70 . Furthermore, the second secondary heat transport fluid HTF22 is transported to the heating device 42 over a fourth path L4, which is greater than the third path L3, wherein in the heating device 42 heat energy is transferred from the second secondary heat transport fluid HTF22 to the second metalliferous product M2.

A heat transfer fluid whose heat capacity is greater than the heat capacity of the primary heat transfer fluid HTF1 is preferably used as the second secondary heat transfer fluid HTF22.

This in 11 The processing system 1 shown is designed to carry out the method whose method flowchart is shown in 5 is shown. This in 11 The processing system 1 shown differs from that in 8th processing system 1 shown in that the processing system 1 has a third heat exchanger device 80 . In a method step S23, thermal energy of the secondary heat transport fluid HTF2 is transferred to a tertiary heat transport fluid HTF3 in the third heat exchanger device 80 . The heating device 43 is designed to, according to a method step S31, heat the tertiary To transfer heat transfer fluid HTF3 at least indirectly to the metal-containing product M1.

Reference List

1

processing system

2

Reflection device / heliostat

3

fluid heating device

10

primary fluid circuit

11

Primary Fluid Inlet Line

12

Primary Fluid Drain Line

20

secondary fluid circuit

21

Secondary Fluid Inlet Line

22

Secondary Fluid Drain Line

202

second secondary fluid circuit

212

second secondary fluid inlet line

222

second secondary fluid drain line

30

heat storage device

31

heat storage medium

41

(first) heater / first furnace

42

second heater / second oven

43

third heater / third oven

50

processing facility

60

(first) heat exchanger device

70

second heat exchanger device

80

third heat exchanger device

HTF1

primary heat transfer fluid

HTF2

secondary heat transfer fluid

HTF22

second secondary heat transfer fluid

HTF3

tertiary heat transfer fluid

M1

(first) metal-containing product

M2

second metal-containing product

L1

first distance / first length

L2

second distance / second length

L3

third distance / third length

L4

fourth distance / fourth length

S

Sun

SR

solar radiation

S1

process step

S11

process step

S122

process step

S1S

process step

S21

process step

S221

process step

S23

process step

S31

process step

SP

process step

SS1

process step

Claims (16)

Method for heating and for further processing of at least one metal-containing product (M1, M2), wherein the at least one metal-containing product (M1, M2) is a metal-containing semi-finished product and/or scrap and/or sponge iron and/or HBI, the method having the following method steps having: - Heating (S1) of a primary heat transport fluid (HTF1) by means of concentrated solar radiation; - transferring (S11, SS1, S21, S221, S31) thermal energy of the primary heat transfer fluid (HTF1) to the metal-containing product (M1, M2); and - Processing (SP) of the heated metal-containing product (M1, M2). procedure after claim 1 , characterized by the following features: - transferring (S1S) thermal energy of the primary heat transport fluid (HTF1) to a heat storage device (30); and - transferring (SS1) heat energy from the heat storage device (30) to the metal-containing product (M1, M2). Method according to one of the preceding claims, characterized by the following features: - transferring (S12) thermal energy of the primary heat transport fluid (HTF1) to a secondary heat transport fluid (HTF2, HTF22) in a heat exchanger device (60); and - transferring (S21) thermal energy of the secondary heat transport fluid (HTF2, HTF22) to the metal-containing product (M1, M2) in a heating device (41, 42, 43). procedure after claim 3 , characterized in that a heat transfer fluid is used as the secondary heat transfer fluid (HTF2, HTF22), the heat capacity of which is greater than the heat capacity of the primary heat transfer fluid (HTF1). procedure after claim 3 or 4 , characterized by the following features: - Transfer (S122) of thermal energy of the primary heat transport fluid (HTF1) to a second secondary heat transport fluid (HTF22) in a second heat exchanger device (70) which is set up parallel to the heat exchanger device (60), so that parallel thermal energy of the primary heat transfer fluid (HTF1) is transferred to the secondary heat transfer fluid (HTF2) and the second secondary heat transfer fluid (HTF22); and - transferring (S221) thermal energy of the second secondary heat transport fluid (HTF22) to a second metal-containing product (M2) in a second heating device (42). Procedure according to one of claims 3 until 5 , characterized by the following steps: - Transporting the primary heat transfer fluid (HTF1) to the heat exchanger device (60) over a first route (L1), wherein in the heat exchanger device (60) heat energy from the primary heat transfer fluid (HTF1) to the secondary heat transfer fluid (HTF2) is transferred; and - transporting the secondary heat transport fluid (HTF2) to the heating device (41, 42, 43) over a second distance (L2) which is greater than the first distance (L1), wherein in the heating device (41, 42, 43) Thermal energy is transferred from the secondary heat transport fluid (HTF2) to the metallic product (M1, M2). Procedure according to one of Claims 5 or 6 , characterized by the following steps: - Transporting the primary heat transport fluid (HTF1) to the second heat exchanger device (70) over a third path (L3), wherein in the second heat exchanger device (70) thermal energy is transferred from the primary heat transport fluid (HTF1) to the second secondary heat transfer fluid (HTF22) is transferred; and - transporting the second secondary heat transport fluid (HTF22) to the heating device (41, 42, 43) over a fourth path (L4) which is greater than the third path (L3), wherein in the heating device (41, 42, 43 ) Heat energy is transferred from the second secondary heat transport fluid (HTF22) to the second metal-containing product (M2). Procedure according to one of claims 3 until 7 , characterized by the following features: - transfer (S23) of thermal energy of the secondary heat transfer fluid (HTF22) to a tertiary heat transfer fluid (HTF3) in a third heat exchanger device (80); and - transferring (S31) thermal energy of the tertiary heat transport fluid (HTF3) to the metal-containing product (M1, M2) in a third heating device (43). procedure after claim 8 , characterized in that a heat transfer fluid is used as the tertiary heat transfer fluid (HTF3), the heat capacity of which differs from the heat capacity of the secondary heat transfer fluid (HTF2, HTF22). Processing system (1) for heating and further processing at least one metal-containing product (M1, M2), wherein the at least one metal-containing product (M1, M2) is a metal-containing semi-finished product and/or scrap and/or sponge iron and/or HBI, having: - A fluid heating device (3), which is designed to heat a primary heat transport fluid (HTF1) by means of concentrated solar radiation; - A heating device (41, 42, 43) which is designed to transfer heat from the primary heat transport fluid (HTF1) at least indirectly to the metal-containing product (M1, M2); and - a processing device (50) for processing the heated metal-containing product (M1, M2). Processing system (1) according to claim 10 , characterized in that the processing system (1) has a heat storage device (30), wherein the processing system (1) is designed to transfer thermal energy of the primary heat transport fluid (HTF1) at least indirectly to the heat storage device (30). Processing system (1) according to claim 10 or 11 characterized by the following features: - the processing system (1) has a heat exchanger device (60, 70) by means of which thermal energy of the primary heat transport fluid (HTF1) can be transferred to a secondary heat transport fluid (HTF2, HTF22); and - the heating device (41, 42, 43) is designed to transfer heat from the secondary heat transport fluid (HTF2, HTF22) at least indirectly to the metal-containing product (M1, M2). Processing system (1) according to claim 12 , characterized by the following features: - the processing system (1) has a second heat exchanger device (70) which is set up parallel to the heat exchanger device (60), so that thermal energy of the primary heat transport fluid (HTF1) is transferred in parallel by means of the heat exchanger device (60). the secondary heat transfer fluid (HTF2) and by means of the second heat exchanger means (70) to the second secondary heat transfer sport fluid (HTF22) is transferrable; and - the processing system (1) has a second heating device (42) which is designed to transfer heat from the second secondary heat transport fluid (HTF22) at least indirectly to a second metal-containing product (M2). Processing system (1) according to one of Claims 12 or 13 characterized by the following features: - the fluid heating device (3) is thermally coupled to the heat exchanger device (60) by means of the primary heat transport fluid (HTF1) circulating in a primary fluid circuit (10); - the heat exchanger device (60) is thermally coupled to the heating device (41) by means of the secondary heat transport fluid (HTF2) circulating in a secondary fluid circuit (20); - A primary fluid supply line (11) of the primary fluid circuit (10), via which the primary heat transport fluid (HTF1) is transported from the fluid heating device (3) in the direction of the heat exchanger device (60), has a first length (L1); - A secondary fluid feed line (21) of the secondary fluid circuit (20), via which the secondary heat transport fluid (HTF2) is transported from the heat exchanger device (60) in the direction of the heating device (41, 42, 43), has a second length ( L2) that is greater than the first length (L1). Processing system (1) according to Claim 13 or 14 characterized by the following features: - the fluid heating device (3) is thermally coupled to the second heat exchanger device (70) by means of the primary heat transport fluid (HTF1) circulating in a primary fluid circuit (10); - the second heat exchanger device (70) is thermally coupled to a second heating device (42, 43) by means of the second secondary heat transport fluid (HTF22) circulating in a second secondary fluid circuit (20); - a primary fluid feed line (11) of the primary fluid circuit (10), via which the primary heat transport fluid (HTF1) is transported from the fluid heating device (3) in the direction of the second heat exchanger device (70), has a third length (L3). ; - A second secondary fluid supply line (212) of the second secondary fluid circuit (202), via which the second secondary heat transport fluid (HTF22) is transported from the second heat exchanger device (70) in the direction of the second heating device (42, 43), has a fourth length (L4) which is greater than the third length (L3). Processing system (1) according to one of Claims 12 until 15 characterized by the following features: - the processing system (1) has a third heat exchanger device (80), by means of which thermal energy of the secondary heat transport fluid (HTF2, HTF22) can be transferred to a tertiary heat transport fluid (HTF3); and - the heating device (41, 42, 43) is designed to transfer heat from the tertiary heat transport fluid (HTF3) at least indirectly to the metal-containing product (M1, M2).

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