EP4425080A1 - Dispositif de chauffage pour l'introduction de chaleur de processus dans un four de fusion ou de chauffage - Google Patents
Dispositif de chauffage pour l'introduction de chaleur de processus dans un four de fusion ou de chauffage Download PDFInfo
- Publication number
- EP4425080A1 EP4425080A1 EP24157291.6A EP24157291A EP4425080A1 EP 4425080 A1 EP4425080 A1 EP 4425080A1 EP 24157291 A EP24157291 A EP 24157291A EP 4425080 A1 EP4425080 A1 EP 4425080A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- heating device
- furnace
- water vapor
- inductor
- induction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000010438 heat treatment Methods 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000002844 melting Methods 0.000 title claims abstract description 4
- 230000008018 melting Effects 0.000 title claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 49
- 238000001816 cooling Methods 0.000 claims abstract description 14
- 238000009413 insulation Methods 0.000 claims abstract description 7
- 239000007789 gas Substances 0.000 claims description 14
- 239000011248 coating agent Substances 0.000 claims description 9
- 238000000576 coating method Methods 0.000 claims description 9
- 230000001939 inductive effect Effects 0.000 claims description 9
- 150000001875 compounds Chemical class 0.000 claims description 5
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 4
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 4
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- YXTPWUNVHCYOSP-UHFFFAOYSA-N bis($l^{2}-silanylidene)molybdenum Chemical compound [Si]=[Mo]=[Si] YXTPWUNVHCYOSP-UHFFFAOYSA-N 0.000 claims description 2
- 239000003575 carbonaceous material Substances 0.000 claims description 2
- 238000005524 ceramic coating Methods 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 229910002804 graphite Inorganic materials 0.000 claims description 2
- 239000010439 graphite Substances 0.000 claims description 2
- 229910021344 molybdenum silicide Inorganic materials 0.000 claims description 2
- 238000011144 upstream manufacturing Methods 0.000 claims description 2
- 239000002918 waste heat Substances 0.000 claims description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 12
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 11
- 239000001257 hydrogen Substances 0.000 description 11
- 229910052739 hydrogen Inorganic materials 0.000 description 11
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 9
- 239000001301 oxygen Substances 0.000 description 9
- 229910052760 oxygen Inorganic materials 0.000 description 9
- 239000003345 natural gas Substances 0.000 description 6
- 238000012545 processing Methods 0.000 description 5
- 238000010494 dissociation reaction Methods 0.000 description 4
- 230000005593 dissociations Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000005868 electrolysis reaction Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000004200 deflagration Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000012770 industrial material Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 238000007751 thermal spraying Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D99/00—Subject matter not provided for in other groups of this subclass
- F27D99/0001—Heating elements or systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D7/00—Forming, maintaining or circulating atmospheres in heating chambers
- F27D7/02—Supplying steam, vapour, gases or liquids
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B1/00—Details of electric heating devices
- H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
- H05B1/0227—Applications
- H05B1/023—Industrial applications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/06—Control, e.g. of temperature, of power
- H05B6/067—Control, e.g. of temperature, of power for melting furnaces
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/0003—Linings or walls
- F27D1/0033—Linings or walls comprising heat shields, e.g. heat shields
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D7/00—Forming, maintaining or circulating atmospheres in heating chambers
- F27D7/02—Supplying steam, vapour, gases or liquids
- F27D2007/023—Conduits
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B2206/00—Aspects relating to heating by electric, magnetic, or electromagnetic fields covered by group H05B6/00
- H05B2206/02—Induction heating
Definitions
- the invention relates to a heating device for introducing process heat into a melting or heating furnace, in which water is introduced via a water supply, preferably in the form of steam, and/or is present in the furnace interior.
- Another way to introduce an increased amount of process heat into a furnace chamber is to heat water, preferably in the form of steam, to a temperature of over 2000° C, which then dissociates it at least partially to HHO. As soon as the HHO cools down again within the furnace chamber to below the dissociation temperature, the hydrogen reacts with the oxygen to form H 2 O again, releasing heat into the furnace chamber.
- Steam and hydrogen are important heat carriers for energy transfer in the furnace. Another important property of steam is the ability to protect the material surface from harmful atmospheric conditions.
- a plasma generator which uses steam as a gas for introducing process heat in the form of plasma into a rotary kiln.
- oxygen and hydrogen are first fed and burned separately and only then fed to the plasma generator as steam.
- plasma leads to very high temperatures, often over 15,000° C to 30,000° C.
- the necessary equipment and materials in the plasma area are subject to very high wear.
- the extremely high temperatures also produce highly reactive chemical compounds, which are also problematic for all kinds of processing, which is why it is not desirable to work in the plasma area for the task at hand.
- the object of the present invention is to create a heating device for the above-mentioned applications, which eliminates the problems mentioned and allows water, preferably in the form of water vapor, to be heated in an open interior to a temperature of over 2000°C, so that it at least partially dissociates to HHO, in order to thereby supply increased process heat to the workpieces in the furnace interior.
- the device should be simple in construction and allow work to be carried out with HHO without the need for complex and safety-related piping and controls for hydrogen and oxygen.
- the system should be energy-efficient and conserve resources, as separate production of hydrogen and oxygen using electrolysis systems and transport are eliminated.
- the system should also be able to operate without emissions.
- the desired arrangement allows the introduced or existing water vapor to be heated to the desired temperatures in order to generate the HHO, which then reacts again in the furnace interior to form H 2 O and thus releases the heat to the workpiece.
- Induction makes it possible to thermally insulate the usually metallic material of the inductor from the induction-capable element to such an extent that the inductor itself is not damaged during operation.
- the inductor is kept at a safe operating temperature by a cooling circuit and only the induction-capable element, which is thermally insulated from it, is heated to the desired temperature.
- the heating device is arranged on a supply line for water, preferably in the form of water vapor, into the furnace, wherein the induction-capable element is arranged to at least partially, preferably completely enclose the inlet area of the supply line into the furnace interior.
- the heating device directly surrounds the inflow area of the supply line into the furnace interior.
- the heated induction-capable element can therefore release heat to the inflowing water or to the inflowing water vapor and raise it above the dissociation temperature, whereby a portion of the water vapor decomposes into HHO and flows into the furnace interior in this high-energy state. Due to the expansion and interaction with the workpiece in the furnace interior, the HHO reacts to form H 2 O again, releasing heat, which means that large amounts of heat can be introduced into the furnace in a very efficient and emission-free manner.
- a gas supply device is provided for introducing additional gases into the supply and, if necessary, into the furnace interior. This can be provided to increase safety, so that the The supply and the furnace interior can be flushed with inert gas when the power is stopped or when starting up. It is also possible to supply other operating gases such as CO 2 , NO, NO 2 or other gases. In the case of CO 2 , for example, this also begins to dissociate at temperatures above 1500° C, whereby the released oxygen can combine with the hydrogen that is also present in the furnace interior. The remaining carbon precipitates. Depending on the application, different gas mixtures can be introduced.
- the induction-capable element is plate-shaped and forms a section of the furnace lining, with the insulation layer and the inductor being arranged on the side of the plate-shaped induction-capable element facing away from the inside of the furnace.
- the heating device can be used as part of the furnace lining. Heating devices can be of different sizes or several heating devices can be arranged as modular elements in the side walls and cover surfaces of the inside wall of the furnace in a matrix-like manner. If several heating devices arranged in a grid are provided, they can be controlled in combination, individually or in groups in order to bring the water vapor present in the interior of the furnace back above the dissociation temperature of about 2000° C.
- the plate-shaped heating devices can ideally be used in combination with the heating device described above on the water supply, preferably in the form of water vapor.
- natural gas burners can also be provided, as these also introduce 30%-60% water vapor into the furnace interior via the burning natural gas.
- the plate-shaped induction-capable element has one or more openings for introducing water, preferably in the form of steam, into the furnace interior. Additional water or steam can also be introduced into the furnace interior via additional openings via the plate-shaped induction-capable elements in the furnace wall and can be heated to over 2000° C as it passes through the induction-capable element.
- the feed is arranged in a circuit with the furnace interior, so that the water vapor generated in the furnace interior by the reaction of the HHO is fed back into the feed.
- the entire furnace system can thus be operated without emissions, since the water vapor required for the heat input is completely circulated. This means that no CO 2 is generated and other pollutants from the workpiece do not escape to the outside with an exhaust gas stream.
- the cooling circuit downstream of the inductor is connected via a heat exchanger to the supply upstream of the induction-capable element, so that the waste heat of the cooling circuit can be used to preheat the introduced water or steam. This can improve the energy efficiency of the entire system.
- the inductive element contains at least a portion of one or more compounds selected from molybdenum silicide, carbon material such as graphite, silicon carbide or tungsten carbide.
- molybdenum silicide carbon material such as graphite, silicon carbide or tungsten carbide.
- carbon material such as graphite, silicon carbide or tungsten carbide.
- the induction-capable element has a heat-resistant and/or wear-resistant coating, preferably a ceramic coating, on the side facing the inside of the furnace or the feed.
- a heat-resistant and/or wear-resistant coating preferably a ceramic coating
- the coating has a thickness of about 0.05 mm to about 2 mm. This layer thickness is sufficient to protect the induction-capable element and at the same time does not hinder the heat transfer into the open interior or into the feed.
- the coating contains at least a proportion of tungsten carbide and/or silicon carbide. These compounds are particularly preferred for the desired application due to their high temperature resistance.
- the heating device is designed such that during operation at least 10%, preferably about 10% to 70% of the water vapor introduced dissociates to HHO. In these areas, there is an optimal heat input to the workpiece in relation to the energy used for the heating device. Both the dimensioning and flow rate of the feed and the design of the induction-capable element must therefore be optimized according to the desired applications in order to achieve an appropriate degree of dissociation.
- FIG.1 A possible embodiment of a heating device according to the invention is shown schematically in a sectional view.
- the heating device is arranged at the inlet area of a feed line 1 for water, preferably in the form of steam, into the furnace interior 2.
- the induction-capable element 3 surrounds the feed line 1 in a tubular manner in order to heat the introduced steam to over 2000° C.
- the inductor 4 in the form of a coil surrounds the induction-capable element 3.
- the inductor 4 is embedded in a liquid-flowing cooling circuit 6 and both the inductor 4 and the cooling circuit 6 are located within a thermal insulation layer 5.
- the thermal insulation layer 5 protects the inductor 4 and the environment from the highly heated induction-capable element 3.
- the element 3 On the inside of the induction-capable element 3, past which the introduced steam flows, the element 3 is provided with a coating 8.
- the layer thicknesses shown are only for explaining the principle and do not correspond to an actual scale.
- the coating 8 can be adapted to the intended application or, if not required, can be omitted entirely.
- one or more such feeds 1 with corresponding heating elements can be provided. Due to the high temperatures of the induction-capable element 3, a portion of the introduced water vapor is dissociated to HHO, with preferably at least 10% of the water vapor being dissociated. In the furnace interior 2, the HHO can then react again to form H 2 O, releasing heat to the workpiece. Because the oxyhydrogen gas is only formed directly at the point of use, no complex piping and control mechanisms are necessary and the system can be operated safely and without the risk of uncontrolled deflagrations or ignitions.
- FIG. 2 and Fig. 3 A further possible embodiment of a heating device according to the invention is shown schematically, in which the induction-capable element 3 is plate-shaped and forms part of the furnace lining 7.
- Fig.2 shows a longitudinal section and Fig.3 a cross-section.
- Heating devices are arranged next to each other in a matrix-like manner.
- Plate-shaped induction-capable elements 3 are arranged on the side walls and on the top of the furnace interior 2 over almost the entire surface.
- the respective associated inductors 4 and the cooling circuit 6 are again arranged in the thermal insulation layer 5 and are thus sufficiently insulated from the induction-capable elements 3 so as not to be damaged.
- the water vapor present in the furnace interior 2 can be specifically heated to over 2000° C and thus at least partially dissociate to HHO.
- heating elements according to the embodiment from Fig.1 thus, even more heat can be effectively supplied to the workpiece in the furnace interior 2.
- Fig. 4 and Fig. 5 show another embodiment similar to that of the Figures 2 and 3 , whereby fewer plate-shaped induction-capable elements 3 are provided and thus only certain areas of the furnace lining 7 are provided with additional heating devices.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Furnace Details (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ATA50096/2023A AT526910A1 (de) | 2023-02-14 | 2023-02-14 | Heizvorrichtung zur Einbringung von Prozesswärme in einen Schmelz- oder Erwärmungsofen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4425080A1 true EP4425080A1 (fr) | 2024-09-04 |
Family
ID=89940796
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP24157291.6A Pending EP4425080A1 (fr) | 2023-02-14 | 2024-02-13 | Dispositif de chauffage pour l'introduction de chaleur de processus dans un four de fusion ou de chauffage |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP4425080A1 (fr) |
| AT (1) | AT526910A1 (fr) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6080954A (en) * | 1996-12-27 | 2000-06-27 | Neturen Co., Ltd | Heat treatment method and apparatus using thermal plasma, and heat treated substance produced thereby |
| EP3314989A1 (fr) * | 2015-06-29 | 2018-05-02 | Tekna Plasma Systems Inc. | Torche à plasma à induction avec une plus grande densité d'énergie du plasma |
| WO2019096885A1 (fr) | 2017-11-16 | 2019-05-23 | Swerim Ab | Four à haute température |
| WO2024031117A2 (fr) * | 2022-08-09 | 2024-02-15 | Thermal Processing Solutions GmbH | Dispositif de préparation d'un plasma |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5495495A (en) * | 1995-05-25 | 1996-02-27 | Saint-Gobain/Norton Industrial Ceramics Corporation | Dense lining for coreless induction furnace |
| GB2339888B (en) * | 1998-06-17 | 2002-07-10 | Rustec Ltd | Induction furnace |
| JP4886080B1 (ja) * | 2011-03-23 | 2012-02-29 | 三井造船株式会社 | 誘導加熱装置、誘導加熱装置の制御方法、及び制御プログラム |
-
2023
- 2023-02-14 AT ATA50096/2023A patent/AT526910A1/de unknown
-
2024
- 2024-02-13 EP EP24157291.6A patent/EP4425080A1/fr active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6080954A (en) * | 1996-12-27 | 2000-06-27 | Neturen Co., Ltd | Heat treatment method and apparatus using thermal plasma, and heat treated substance produced thereby |
| EP3314989A1 (fr) * | 2015-06-29 | 2018-05-02 | Tekna Plasma Systems Inc. | Torche à plasma à induction avec une plus grande densité d'énergie du plasma |
| WO2019096885A1 (fr) | 2017-11-16 | 2019-05-23 | Swerim Ab | Four à haute température |
| WO2024031117A2 (fr) * | 2022-08-09 | 2024-02-15 | Thermal Processing Solutions GmbH | Dispositif de préparation d'un plasma |
Also Published As
| Publication number | Publication date |
|---|---|
| AT526910A1 (de) | 2024-08-15 |
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