A composite heating type inner heater for titanium sponge production

Abstract

The application provides a composite heating type inner heater for titanium sponge production, which is used for heating a communicating pipe and comprises a heating coil assembly, the heating coil assembly comprises an induction coil, and the material of the induction coil is Cr20Ni80 high-temperature resistance alloy; an electromagnetic induction heating control power supply is used for converting an industrial power supply into a high-frequency power supply and inputting the high-frequency power supply into the induction coil, so that the induction coil generates a changing magnetic field for electromagnetic induction heating of the communicating pipe, and the induction coil itself generates eddy current self-heating for resistance self-heating heating; and a heat preservation protection structure at least partially covers the heating coil assembly. The composite heating type inner heater for titanium sponge production can overcome defects of a traditional resistance type inner heater, such as short service life, easy failure, inability to repair and poor working condition adaptability, and can also get rid of the dependence of conventional electromagnetic induction heating on a water cooling system.

Description

Technical Field

[0001] This invention relates to the field of non-ferrous metal smelting technology, and more specifically, to a composite heating type internal heater for the production of sponge titanium. Background Technology

[0002] In the distillation process of sponge titanium production, the internal heater is the core heating equipment. Current technology commonly uses a purely resistive internal heater, powered by 380V / 220V, with the heating wire made of 0Cr21Al6Nb material. This purely resistive internal heater has several technical defects in actual production conditions, as follows:

[0003] 1. Under high-temperature conditions, the iron oxide scale produced by the steel cover can easily cause the heating wire protection to fail, leading to short circuits in the heating wire and directly causing heating failure;

[0004] 2. The vibration generated during the flipping of the cover can cause the refractory material to break due to insufficient strength, which in turn changes the position of the heating wire and disrupts the uniformity of heating.

[0005] 3. If the internal heater malfunctions, the distillation process is forced to stop. The reactor must be pressurized, the passageway disassembled, and the entire heater replaced after cooling. A single fault can take more than two shifts to handle, which seriously affects the production schedule.

[0006] 4. Traditional internal heaters are disposable consumables with a service life of only 4-5 uses. Once damaged, they cannot be repaired and must be scrapped entirely, resulting in high equipment operating costs.

[0007] 5. The thermal efficiency of pure resistance heating is limited, and the heating wire is prone to embrittlement at high temperatures, making it unsuitable for complex on-site conditions such as high temperature, vibration, and accumulation of oxidized slag.

[0008] Existing electromagnetic induction heating technology has weak magnetic properties at high temperatures, making it unsuitable for the 900-950℃ operating temperature of sponge titanium distillation. Furthermore, conventional electromagnetic induction heating equipment often uses copper tubes for its induction coils, requiring a water-cooling system. However, the on-site operating conditions of sponge titanium distillation cannot meet the requirements for water-cooling installation and use, thus preventing the direct application of conventional electromagnetic induction heating technology.

[0009] In summary, the existing internal heater technology cannot overcome the shortcomings of traditional resistance internal heaters, such as short lifespan, easy failure, inability to repair, and poor adaptability to working conditions. It also cannot get rid of the dependence of conventional electromagnetic induction heating on water cooling systems. Therefore, it cannot perfectly adapt to the complex working conditions of high temperature, vibration, and lack of cooling water at the sponge titanium distillation site.

[0010] In view of this, the present invention is hereby proposed. Summary of the Invention

[0011] The purpose of this invention is to propose a composite heating type internal heater for the production of sponge titanium, in order to solve the problems of existing internal heaters, which cannot overcome the defects of traditional resistance internal heaters such as short life, easy failure, inability to maintain, and poor adaptability to working conditions, and cannot get rid of the dependence of conventional electromagnetic induction heating on water cooling systems, thus failing to perfectly adapt to the complex working conditions of high temperature, vibration and no cooling water at the sponge titanium distillation site.

[0012] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0013] A composite heating type internal heater for use in the production of sponge titanium, the composite heating type internal heater being used to heat the connecting pipe of the reactor cover, the composite heating type internal heater comprising:

[0014] A heating coil assembly, comprising an induction coil made of Cr20Ni80 high-temperature resistance alloy;

[0015] An electromagnetic induction heating control power supply is used to convert industrial power into high-frequency power and pass it into the induction coil, so that the induction coil generates a changing magnetic field for electromagnetic induction heating of the connecting pipe, and at the same time, the induction coil itself generates eddy currents for self-heating for resistance self-heating.

[0016] A thermal insulation and protection structure, wherein the thermal insulation and protection structure at least partially covers the heating coil assembly.

[0017] Furthermore, the thermal insulation structure includes multiple high-temperature ceramic beads, which are strung together on the induction coil.

[0018] Furthermore, the thermal insulation and protection structure also includes a high-temperature resistant insulating fixing buckle, which is installed on the outer circumference of the connecting pipe. An installation groove is formed on the high-temperature resistant insulating fixing buckle, and the induction coil through which the high-temperature ceramic bead is inserted is installed in the installation groove.

[0019] Furthermore, the thermal insulation structure also includes a thermal insulation structure, which covers the outside of the high-temperature ceramic beads.

[0020] Furthermore, a buffer structure is provided between the mounting groove and the high-temperature ceramic bead.

[0021] Furthermore, a slag discharge port is provided on the heat insulation structure, and the slag discharge port is located on the top of the heating coil assembly.

[0022] Furthermore, the diameter of the induction coil is ≥5mm.

[0023] Furthermore, the composite heating type internal heater also includes a high-temperature connection component, which includes a high-temperature cable and a docking terminal. The high-temperature cable connects the electromagnetic induction heating control power supply to the induction coil; the docking terminal is used to connect the high-temperature cable to the induction coil.

[0024] Furthermore, the composite heating type internal heater is adapted to a sponge titanium distillation operating temperature of 900-950℃.

[0025] Compared with the prior art, the composite heating internal heater for sponge titanium production described in this invention has the following advantages:

[0026] 1. Significantly extended equipment lifespan: The induction coil is made of Cr20Ni80 high-temperature resistance alloy, which works in conjunction with the electromagnetic induction heating control power supply and heat preservation structure to solve problems such as high-temperature embrittlement, vibration fracture, and short circuit caused by oxide slag. The long-term service life of the equipment is no less than 12 months, which is a qualitative improvement compared to the 4-5 month service life of traditional heaters. In addition, the induction coil is weldable for maintenance, avoiding complete scrapping and significantly reducing equipment procurement costs.

[0027] 2. Improved heating efficiency and energy saving: It integrates a dual heating mode of high-frequency electromagnetic induction and resistance self-heating, with a stable thermal efficiency of over 93%. Compared with traditional pure resistance heating, the heating efficiency is significantly improved, while reducing heat loss and achieving energy saving and consumption reduction.

[0028] 3. Reduce downtime due to malfunctions: Equipped with an intelligent control power supply, featuring fault code display, short circuit protection, and leakage warning functions, faults can be quickly diagnosed and handled; the high-temperature docking terminals support disassembly under high-temperature conditions, and emergency handling does not require overall cooling, significantly shortening the time for handling a single fault and ensuring the continuity of distillation production;

[0029] 4. Perfectly adapted to on-site working conditions: Abandoning the water-cooling design, it adopts a Cr20Ni80 high-temperature resistance alloy induction coil, which is suitable for the complex working conditions of high temperature, vibration and no water cooling in the sponge titanium distillation site; at the same time, it meets the vacuum tightness requirements, is highly compatible with the production process, improves heating uniformity, and effectively avoids product quality problems caused by uneven heating. Attached Figure Description

[0030] Figure 1 This is a schematic cross-sectional view of a reactor cover according to an embodiment of the present invention;

[0031] Figure 2 This is a cross-sectional structural diagram of a composite heating type internal heater for sponge titanium production according to an embodiment of the present invention;

[0032] Figure 3This is a schematic cross-sectional view of the induction coil and high-temperature ceramic beads of a composite heating type internal heater used for the production of sponge titanium, as described in an embodiment of the present invention.

[0033] Explanation of reference numerals in the attached figures:

[0034] 100. Reactor cover; 1. Composite heating type internal heater; 11. Heating coil assembly; 111. Induction coil; 12. Thermal insulation and protection structure; 121. High temperature ceramic beads; 122. High temperature resistant insulating fixing buckle; 123. Mounting groove; 124. Thermal insulation structure; 2. Connecting pipe; 3. Slag discharge port. Detailed Implementation

[0035] To make the technical means and objectives and effects of the present invention easier to understand, the embodiments of the present invention will be described in detail below with reference to specific illustrations.

[0036] It should be noted that all directional and positional terms used in this invention, such as "up," "down," "left," "right," "front," "back," "vertical," "horizontal," "inner," "outer," "top," "bottom," "lateral," "longitudinal," and "center," are only used to explain the relative positional relationships and connections between components in a specific state (as shown in the accompanying drawings). They are merely for the convenience of describing the invention and do not require the invention to be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention. Furthermore, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated.

[0037] In the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0038] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0039] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0040] Example 1

[0041] In the existing technology, the internal heater cannot overcome the defects of traditional resistance internal heaters, such as short life, easy failure, inability to repair, and poor adaptability to working conditions. It also cannot get rid of the dependence of conventional electromagnetic induction heating on water cooling system. Therefore, it cannot perfectly adapt to the complex working conditions of high temperature, vibration and no cooling water at the sponge titanium distillation site.

[0042] To address the aforementioned technical problems, this invention abandons the single mode of traditional pure resistance heating and conventional electromagnetic induction heating, and designs a composite heating type internal heater 1 that integrates high-frequency electromagnetic induction and resistance self-heating technologies. This solves the problems of short lifespan, frequent failures, and high maintenance costs of traditional resistance-type internal heaters, and is suitable for heating operations in sponge titanium reduction distillation combined furnaces, achieving efficient and long-life heating adapted to sponge titanium production sites. Specific details are as follows:

[0043] This embodiment proposes a composite heating type internal heater 1 for use in the production of sponge titanium, such as... Figures 1-3 As shown, the composite heating type internal heater 1 is used to heat the connecting pipe 2 of the reactor cover 100. The composite heating type internal heater 1 includes:

[0044] The heating coil assembly 11 includes an induction coil 111 made of Cr20Ni80 high-temperature resistance alloy. This material has a long-term operating temperature of up to 1200℃, which is suitable for production conditions where the working temperature of sponge titanium distillation is 900-950℃. It is also not easily brittle at high temperatures, has good weldability, and is easy to maintain. At the same time, this material can replace conventional copper tube coils to generate a magnetic field without water cooling, making it perfectly suited for on-site conditions.

[0045] The electromagnetic induction heating control power supply is used to convert industrial power into high-frequency power and supply it to the induction coil 111, causing the induction coil 111 to generate a changing magnetic field for electromagnetic induction heating of the connecting pipe 2. At the same time, the induction coil 111 itself generates eddy currents for self-heating, which is used for resistance self-heating. The control power supply converts the 50Hz industrial power into 15kHz high-frequency power and supplies it to the Cr20Ni80 induction coil 111, which generates a changing magnetic field, causing eddy current heating (electromagnetic induction heating) in the stainless steel pipe inside the reactor. At the same time, the Cr20Ni80 induction coil 111 itself generates eddy currents for self-heating due to resistance, forming a dual heating effect of electromagnetic induction and resistance self-heating, which greatly improves the heating efficiency.

[0046] Thermal insulation and protection structure 12, which at least partially covers the heating coil assembly 11.

[0047] The composite heating internal heater 1 for sponge titanium production described in this invention integrates high-frequency electromagnetic induction and resistance self-heating technologies. At temperatures below or equal to 350°C, heating is mainly achieved through the high-frequency electromagnetic induction of the induction coil 111. At temperatures above 350°C, the magnetic field weakens, and heating primarily occurs through eddy currents generated by the resistance of the induction coil 111 itself. This design overcomes the shortcomings of traditional resistance internal heaters, such as short lifespan, susceptibility to failure, lack of maintenance, and poor adaptability to operating conditions. It also eliminates the dependence on water cooling systems for conventional electromagnetic induction heating, thus perfectly adapting to the complex operating conditions of high temperature, vibration, and lack of cooling water at sponge titanium distillation sites.

[0048] Specifically, the electromagnetic induction heating control power supply includes an amorphous magnetic ring, used to solve the resistance matching problem of the induction coil 111 through transformer ratio adjustment, and to achieve the superposition of heat from dual heating. By adjusting the transformer ratio of the amorphous magnetic ring, the matching problem between the excessively low resistance of the Cr20Ni80 coil and the industrial power supply is solved, achieving the superposition of heat from dual heating, which acts on the stainless steel pipe, ensuring heating uniformity.

[0049] Specifically, the thermal insulation and protection structure 12 includes a plurality of high-temperature ceramic beads 121, which are strung together on the induction coil 111.

[0050] This design effectively protects against high-temperature iron oxide scale and prevents oxide slag buildup from causing short circuits between coil turns.

[0051] Specifically, the thermal insulation and protection structure 12 also includes a high-temperature resistant insulating fixing buckle 122, which is installed on the outer circumference of the connecting pipe 2. An installation groove 123 is formed on the high-temperature resistant insulating fixing buckle 122, and the induction coil 111 through which the high-temperature ceramic bead 121 passes is installed in the installation groove 123.

[0052] This setting can resist the vibration caused by the flipping of the cover and prevent the position of the induction coil 111 from shifting.

[0053] Specifically, the thermal insulation and protection structure 12 also includes a thermal insulation and heat insulation structure 124, which includes covering the outside of the high-temperature ceramic bead 121.

[0054] The thermal insulation structure 124 is a high-temperature resistant insulation material capable of withstanding temperatures above 1200℃. The thermal insulation structure 124 provides thermal isolation, reducing heat loss and ensuring thermal efficiency. The thermal insulation structure 124 is detachable and reusable.

[0055] Specifically, a buffer structure is provided between the mounting groove 123 and the high-temperature ceramic bead 121.

[0056] This setting can further resist the vibration caused by the flipping of the cover and further prevent the position of the induction coil 111 from shifting.

[0057] Specifically, a slag discharge port 3 is provided on the heat insulation structure 124, and the slag discharge port 3 is located on the top of the heating coil assembly 11.

[0058] This setup facilitates regular cleaning of oxide residue, further prevents short circuits in induction coil 111, and extends equipment lifespan.

[0059] Specifically, the diameter of the induction coil 111 is ≥5mm.

[0060] The induction coil 111 is designed for welding and repair, avoiding complete scrapping and significantly reducing equipment procurement costs.

[0061] In this embodiment, the diameter of the induction coil 111 is 6mm.

[0062] Specifically, the composite heating type internal heater 1 further includes a high-temperature connection component, which includes a high-temperature cable and a docking terminal. The high-temperature cable connects the electromagnetic induction heating control power supply to the induction coil 111; the docking terminal is used to connect the high-temperature cable to the induction coil 111.

[0063] The high-temperature cable has the advantages of high temperature resistance and wear resistance, which can meet the connection requirements under high temperature conditions; the mating connection terminal has a temperature resistance rating of 800℃, supports disassembly and replacement under high temperature conditions, and meets the emergency needs of on-site sealing replacement and power transfer.

[0064] The insulation resistance to ground of the high-temperature cable and the mating terminal meets the requirements of the electrical insulation level; the heating coil assembly 11 as a whole meets the requirements of vacuum tightness and is suitable for the airtight working conditions of the sponge titanium distillation process.

[0065] Specifically, the composite heating type internal heater 1 is adapted to a sponge titanium distillation working temperature of 900-950℃.

[0066] The composite heating type internal heater 1 includes other related components in addition to the above-mentioned structure. Since the specific structure and assembly relationship of the related components are existing technologies, they will not be described in detail here.

[0067] Compared with the prior art, the composite heating type internal heater 1 for sponge titanium production described in this embodiment has the following advantages:

[0068] 1. Significantly extended equipment lifespan: The induction coil 111 is made of Cr20Ni80 high-temperature resistance alloy. Working together with the electromagnetic induction heating control power supply and the heat preservation and protection structure 12, it solves problems such as high-temperature embrittlement, vibration fracture, and short circuit caused by oxide slag. The long-term service life of the equipment is no less than 12 months, which is a qualitative improvement compared to the 4-5 month service life of traditional heaters. In addition, the induction coil 111 is weldable for maintenance, avoiding complete scrapping and significantly reducing equipment procurement costs.

[0069] 2. Improved heating efficiency and energy saving: It integrates the dual heating modes of high-frequency electromagnetic induction and resistance self-heating, with a stable thermal efficiency of over 93%. Compared with traditional pure resistance heating, the heating efficiency is significantly improved, while reducing heat loss and achieving energy saving and consumption reduction.

[0070] 3. Reduce downtime due to malfunctions: Equipped with an intelligent control power supply, featuring fault code display, short circuit protection, and leakage warning functions, faults can be quickly diagnosed and handled; the high-temperature docking terminals support disassembly under high-temperature conditions, and emergency handling does not require overall cooling, significantly shortening the time for handling a single fault and ensuring the continuity of distillation production;

[0071] 4. Perfectly adapted to on-site working conditions: Abandoning the water-cooling design, it adopts the Cr20Ni80 high-temperature resistance alloy induction coil 111, which is suitable for the complex working conditions of high temperature, vibration and no water cooling in the sponge titanium distillation site; at the same time, it meets the vacuum tightness requirements, is highly compatible with the production process, improves heating uniformity, and effectively avoids product quality problems caused by uneven heating.

[0072] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A composite heating type internal heater for use in the production of sponge titanium, characterized in that, The composite heating type internal heater (1) is used to heat the connecting pipe (2) of the reactor cover (100), and the composite heating type internal heater (1) includes: Heating coil assembly (11), the heating coil assembly (11) includes an induction coil (111), the induction coil (111) is made of Cr20Ni80 high temperature resistance alloy; The electromagnetic induction heating control power supply is used to convert industrial power into high-frequency power and pass it into the induction coil (111), so that the induction coil (111) generates a changing magnetic field for electromagnetic induction heating of the connecting pipe (2), and at the same time, the induction coil (111) generates eddy current self-heating for resistance self-heating heating. Thermal insulation and protection structure (12) at least partially covers the heating coil assembly (11).

2. The composite heating type internal heater for sponge titanium production according to claim 1, characterized in that, The thermal insulation and protection structure (12) includes multiple high-temperature ceramic beads (121), which are strung together on the induction coil (111).

3. A composite heating type internal heater for sponge titanium production according to claim 2, characterized in that, The thermal insulation and protection structure (12) also includes a high-temperature resistant insulating fixing buckle (122), which is installed on the outer circumference of the connecting pipe (2). An installation groove (123) is formed on the high-temperature resistant insulating fixing buckle (122), and the induction coil (111) through which the high-temperature ceramic bead (121) is inserted is installed in the installation groove (123).

4. A composite heating type internal heater for sponge titanium production according to claim 3, characterized in that, The thermal insulation and protection structure (12) also includes a thermal insulation structure (124), which covers the outside of the high-temperature ceramic bead (121).

5. A composite heating type internal heater for sponge titanium production according to claim 3, characterized in that, A buffer structure is provided between the mounting groove (123) and the high-temperature ceramic bead (121).

6. A composite heating type internal heater for sponge titanium production according to claim 4, characterized in that, A slag discharge port (3) is provided on the heat insulation structure (124), and the slag discharge port (3) is located on the top of the heating coil assembly (11).

7. A composite heating type internal heater for sponge titanium production according to claim 1, characterized in that, The diameter of the induction coil (111) is ≥5mm.

8. A composite heating type internal heater for sponge titanium production according to claim 1, characterized in that, The composite heating type internal heater (1) also includes a high-temperature connection component, which includes a high-temperature cable and a docking terminal. The high-temperature cable connects the electromagnetic induction heating control power supply to the induction coil (111); the docking terminal is used to connect the high-temperature cable to the induction coil (111).

9. A composite heating type internal heater for sponge titanium production according to any one of claims 1 to 8, characterized in that, The composite heating type internal heater (1) is adapted to a sponge titanium distillation working temperature of 900-950℃.

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