Thermocouple for measuring high-temperature chlorinated fused salt

Abstract

The utility model relates to the technical field of titanium tetrachloride production, in particular to a thermocouple for measuring high-temperature chlorinated fused salt, which comprises a protective sleeve, a junction box mounted at one end of the protective sleeve, a patch board mounted inside the junction box, a binding post mounted on the patch board, a thermocouple core arranged inside the protective sleeve and comprising two electrodes. One ends of the electrodes are welded together through laser, the other ends of the electrodes are led out through wires to be connected to binding posts, and the electrodes and the wires are sleeved with insulating sleeves. According to the thermocouple for measuring the high-temperature chlorinated fused salt, the electrode material formed by combining the nickel-based alloy and the platinum-rhodium alloy, the tantalum-zirconium alloy protection sleeve, the high-temperature ceramic powder insulation sleeve, the corrosion-resistant and explosion-proof polytetrafluoroethylene junction box and the like are innovatively designed; the corrosion resistance, the measurement precision and the service life of the thermocouple in a high-temperature chlorinated molten salt environment are remarkably improved, meanwhile, good insulation performance and anti-explosion safety are ensured, and installation and maintenance are convenient.

Description

Technical Field

[0001] This utility model relates to the field of titanium tetrachloride production technology, and more specifically, to a thermocouple for measuring high-temperature chlorinated molten salt. Background Technology

[0002] Molten salt chlorination is an important process in the production of titanium tetrachloride (TiCl4). This method involves suspending titanium slag and petroleum coke in a molten salt medium, where they react with chlorine gas at a high temperature of 720–800°C to produce titanium tetrachloride. Molten salt chlorination has significant advantages over other processes, such as its ability to handle materials with high calcium and magnesium oxide content and low carbon dioxide levels, thus broadening the range of applicable raw materials. However, this process also has significant drawbacks, the most prominent being the problem of recycling and disposing of large quantities of waste molten salt slag, and the corrosion of key components and materials such as furnace linings and thermocouples in the high-temperature molten salt environment.

[0003] In high-temperature molten salt environments, traditional thermocouples face significant challenges as temperature measuring devices. Due to the highly corrosive and oxidizing properties of molten salt, the electrode materials and insulating sleeves of traditional thermocouples are easily corroded, leading to decreased measurement accuracy and a significantly shortened lifespan. This not only increases production costs but also poses a potential threat to the stability and safety of the production process.

[0004] Specifically, the failure mechanisms of traditional thermocouples in chlorinated molten salt environments mainly include the following aspects:

[0005] Electrode material corrosion: Corrosive media such as chloride ions in high-temperature molten salt can react chemically with electrode materials, leading to corrosion and peeling of the electrode materials, which in turn affects the measurement accuracy of thermocouples.

[0006] Insulation sleeve failure: The insulation sleeve is prone to aging and cracking in high temperature and corrosive environments, which can lead to short circuits or leakage between electrodes, making the thermocouple unable to work properly.

[0007] Poor thermal stability: Traditional thermocouples have insufficient thermal stability in high-temperature environments and are prone to thermal drift, meaning that the measured value shifts over time, affecting the accuracy of the measurement. Utility Model Content

[0008] The purpose of this invention is to provide a thermocouple for measuring high-temperature chlorinated molten salts, in order to solve the problem mentioned in the background art that the electrode materials and insulating sleeves of traditional thermocouples are easily corroded, resulting in decreased measurement accuracy and a significantly shortened service life.

[0009] To achieve the above objectives, this utility model provides a thermocouple for measuring high-temperature molten chlorinated salt, comprising a protective sleeve, a junction box installed at one end of the protective sleeve, a junction plate installed inside the junction box, a terminal block installed on the junction plate, a thermocouple core disposed inside the protective sleeve, the thermocouple core comprising two electrodes, one end of the electrodes being laser-welded together, the other end of the electrodes being led out through a wire and connected to the terminal block, and an insulating sleeve covering the electrodes and the wire.

[0010] Preferably, the electrode includes a positive electrode and a negative electrode. The positive electrode is made of a nickel-based alloy material with a diameter of 0.5 mm, and the negative electrode is made of a platinum-rhodium alloy material with a diameter of 0.5 mm. The outer surface of the electrode is wrapped with a stainless steel layer.

[0011] Preferably, the insulating sleeve is made of high-temperature ceramic powder material with an inner diameter of 1.5 mm and an outer diameter of 2.5 mm.

[0012] Preferably, the welding end of the electrode is a temperature measuring end, the temperature measuring end is made of platinum-rhodium alloy, the wiring end of the wire is set in the junction box and fixed by screws, and the junction plate is made of ceramic material.

[0013] Preferably, the protective sleeve is a tantalum-zirconium alloy tube with a wall thickness of 4mm, an inner diameter of 10mm, and an outer diameter of 20mm.

[0014] Preferably, the junction box is also equipped with a threading bolt, the end of which is provided with a washer. A junction box cover is installed on the outside of the junction box, the outer wall of which is connected to the junction box by a chain, and an insulating rubber sleeve is installed on the inner wall of which.

[0015] Preferably, the junction box is made of corrosion-resistant and explosion-proof polytetrafluoroethylene material.

[0016] Preferably, the terminals of the wire are sealed with high-temperature ceramic powder.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] This thermocouple for measuring high-temperature molten salt chloride utilizes innovative designs, including a combination of nickel-based alloy and platinum-rhodium alloy electrode materials, a tantalum-zirconium alloy protective sheath, a high-temperature ceramic powder insulating sleeve, and a corrosion-resistant and explosion-proof polytetrafluoroethylene junction box. These innovations significantly improve the thermocouple's corrosion resistance, measurement accuracy, and service life in high-temperature molten salt chloride environments, while ensuring good insulation performance and explosion-proof safety. Furthermore, the thermocouple is easy to install and maintain, providing an efficient and reliable solution for temperature measurement in the titanium tetrachloride production process. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the internal structure of the protective sleeve in this utility model;

[0021] Figure 3 This is a partial structural diagram of the thermocouple core in this utility model;

[0022] The meanings of the labels in the diagram are as follows:

[0023] 1. Washer; 2. Wire bolt; 3. Chain; 4. Junction box cover; 5. Terminal; 6. Insulating sleeve; 7. Junction box; 8. Terminal block; 9. Protective sleeve; 10. Insulating sleeve; 11. Electrode; 12. Wire; 13. Temperature measuring end; 14. Terminal. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] This invention provides a thermocouple for measuring high-temperature chlorinated molten salts, such as... Figures 1-3 As shown, the device includes a protective sleeve 9, with a junction box 7 installed at one end. Inside the junction box 7 is a junction plate 8, with terminals 5 mounted on the junction plate 8. Inside the protective sleeve 9 is a thermocouple core, comprising two electrodes 11. One end of each electrode 11 is laser-welded together, and the other end is led out via a wire 12 and connected to the terminal 5. An insulating sleeve 10 covers the electrodes 11 and the wire 12. The protective sleeve 9 effectively isolates the high-temperature molten salt environment, ensuring stable operation of the internal components. The combined design of the junction box 7 and the junction plate 8, along with the precise layout of the terminals 5, ensures reliable electrical signal transmission. The innovative laser-welded electrode 11 process used in the thermocouple core not only improves temperature measurement accuracy but also enhances structural stability. The insulating sleeve 10 covering the wire 12 and the electrodes 11 further ensures electrical safety and effectively prevents short-circuit risks. Overall, the measurement accuracy, service life, and safety of this thermocouple in a high-temperature chlorinated molten salt environment are significantly improved.

[0026] In this embodiment, electrode 11 includes a positive electrode and a negative electrode. The positive electrode is made of a nickel-based alloy with a diameter of 0.5 mm, and the negative electrode is made of a platinum-rhodium alloy with a diameter of 0.5 mm. The outer surface of electrode 11 is covered with a stainless steel layer. Using nickel-based alloy and platinum-rhodium alloy of specific diameters as the positive and negative electrode materials can make full use of the characteristics of the two materials. Nickel-based alloy provides good mechanical properties and certain corrosion resistance, while platinum-rhodium alloy has excellent high-temperature stability and oxidation resistance. The combination of the two can accurately measure the temperature of high-temperature molten salt chloride. The outer stainless steel layer further enhances the corrosion resistance of electrode 11, prevents high-temperature molten salt from corroding electrode 11, ensures long-term stable operation of electrode 11, and extends the service life of thermocouple.

[0027] Specifically, the insulating sleeve 10 is made of high-temperature ceramic powder material with an inner diameter of 1.5 mm and an outer diameter of 2.5 mm. The selection of high-temperature ceramic powder of specific dimensions as the material for the insulating sleeve 10 ensures its excellent insulation properties, effectively preventing short circuits or leakage between the electrodes 11 and guaranteeing the electrical safety of the thermocouple. Simultaneously, its high-temperature characteristics allow it to maintain stable insulation performance in a high-temperature molten salt environment, ensuring normal thermocouple operation and improving measurement reliability.

[0028] Furthermore, the welding end of electrode 11 is the temperature sensing end 13, which is made of platinum-rhodium alloy. The connection end 14 of wire 12 is located inside junction box 7 and fixed with screws. The junction plate 8 is made of ceramic material. The temperature sensing end 13 is made of platinum-rhodium alloy, which has excellent oxidation and corrosion resistance at high temperatures. It can accurately sense and transmit the temperature signal of high-temperature molten salt, reduce measurement errors caused by material deterioration, and ensure the measurement accuracy of thermocouple in high-temperature and highly corrosive environments. The connection end 14 of wire 12 is located inside junction box 7 and fixed with screws. This design makes the wiring firm and reliable, reducing contact problems caused by vibration or external force. The junction plate 8, made of ceramic material, has high insulation and high temperature resistance, which can effectively prevent electrical short circuits, ensure stable transmission of electrical signals, and improve the overall performance and safety of thermocouple.

[0029] Furthermore, the protective sleeve 9 is a tantalum-zirconium alloy tube with a wall thickness of 4mm, an inner diameter of 10mm, and an outer diameter of 20mm. The protective sleeve 9 uses a tantalum-zirconium alloy tube of a specific size. Tantalum-zirconium alloy has excellent corrosion resistance and high-temperature strength. The 4mm wall thickness further enhances its corrosion resistance and pressure resistance, effectively protecting the internal thermocouple core from the erosion and mechanical damage of high-temperature molten chloride salts, providing a reliable guarantee for the stable operation of the thermocouple in harsh environments.

[0030] Furthermore, a wire threading bolt 2 is installed on the junction box 7, with a washer 1 at its end. A junction box cover 4 is installed on the outside of the junction box 7, and the outer wall of the junction box cover 4 is connected to the junction box 7 via a chain 3. An insulating sleeve 6 is installed on the inner wall of the junction box cover 4. The design of the wire threading bolt 2 and the washer 1 at its end facilitates the introduction and fixation of the wire 12. At the same time, the washer 1 can also play a sealing and buffering role to prevent damage to the wire 12. The junction box cover 4 is connected to the junction box 7 via the chain 3, which is convenient to operate and not easy to lose. The insulating sleeve 6 on the inner wall of the junction box cover 4 can enhance the insulation performance of the junction box 7, prevent electric shock to personnel, and improve the safety and reliability of the equipment.

[0031] Furthermore, junction box 7 is made of corrosion-resistant and explosion-proof polytetrafluoroethylene (PTFE). PTFE has excellent corrosion resistance, effectively resisting the erosion of high-temperature molten chlorinated salts and preventing damage to the internal components of junction box 7; at the same time, its explosion-proof performance can avoid the risk of explosion caused by internal electrical sparks and other factors in high-temperature and high-pressure environments, ensuring the safety of equipment and personnel.

[0032] Furthermore, the external terminal 14 of the conductor 12 is sealed with high-temperature ceramic powder. Sealing the external terminal 14 with high-temperature ceramic powder effectively prevents corrosive media such as high-temperature molten salts from entering the terminal 14, avoiding corrosion, short circuits, and other problems, ensuring stable transmission of electrical signals, and improving the measurement accuracy and service life of the thermocouple.

[0033] In use, the thermocouple of this invention for measuring high-temperature molten salt chloride first employs a protective sheath 9 to effectively isolate the internal thermocouple core from the high-temperature molten salt environment, preventing corrosion and mechanical damage to the internal components. The two electrodes 11 in the thermocouple core are made of a 0.5mm diameter nickel-based alloy for the positive electrode and a 0.5mm diameter platinum-rhodium alloy for the negative electrode. These two electrodes are laser-welded together at one end to form a temperature-sensing end 13. This temperature-sensing end 13, made of platinum-rhodium alloy, exhibits excellent oxidation and corrosion resistance at high temperatures, enabling accurate sensing of the temperature of the high-temperature molten salt chloride. Because the temperature-sensing end 13 is located in the high-temperature molten salt chloride environment, a temperature difference exists between it and the other end of the connector. Based on the thermoelectric effect, a thermoelectric electromotive force is generated in the electrode 11.

[0034] The other end of electrode 11 is led out through wire 12. An insulating sleeve 10, made of high-temperature ceramic powder material with an inner diameter of 1.5 mm and an outer diameter of 2.5 mm, is fitted around both wire 12 and electrode 11 to effectively prevent short circuits or leakage between electrodes 11, ensuring electrical safety. The terminal 14 of wire 12 is located inside junction box 7 and fixed with screws, ensuring a secure and reliable connection and reducing contact problems caused by vibration or external forces. Junction box 7 is made of corrosion-resistant and explosion-proof polytetrafluoroethylene material, effectively resisting the corrosion of high-temperature molten salts and preventing damage to internal components. Its explosion-proof performance also avoids the risk of explosion caused by internal electrical sparks in high-temperature and high-pressure environments. A ceramic junction box 8 is installed inside junction box 7, with terminals 5 mounted on it. The terminal 14 of wire 12 is connected to the terminals 5, transmitting the thermoelectric potential to external measuring equipment.

[0035] The junction box 7 is equipped with a wire threading bolt 2, and the end of the wire threading bolt 2 is provided with a washer 1 to facilitate the introduction and fixation of the wire 12. At the same time, the washer 1 can play a sealing and buffering role to prevent the wire 12 from being damaged.

[0036] A junction box cover 4 is installed on the outside of the junction box 7. The outer wall of the junction box cover 4 is connected to the junction box 7 by a chain 3, which facilitates operation and prevents loss. An insulating sleeve 6 is installed on the inner wall of the junction box cover 4 to enhance the insulation performance of the junction box 7, prevent electric shock, and improve the safety and reliability of the equipment. The terminals 14 of the wires 12 are sealed with high-temperature ceramic powder to effectively prevent corrosive media such as high-temperature molten salts from entering the terminals 14, avoiding corrosion, short circuits, and other problems, and ensuring stable transmission of electrical signals.

[0037] After receiving the thermoelectric potential signal, the external measuring equipment converts it into the corresponding high-temperature molten salt temperature value according to the thermocouple's calibration table, and displays and records it. Throughout the operation, the protective sleeve 9 effectively ensures the stable operation of internal components. The combination design of the junction box 7 and the junction plate 8, along with the precise layout of the terminals 5, ensures the reliability of electrical signal transmission. The innovative process of using laser-welded electrodes 11 in the thermocouple core improves temperature measurement accuracy and enhances structural stability. The insulating sleeve 10 covering the wires 12 and electrodes 11 further ensures electrical safety and effectively prevents short-circuit risks. Overall, the measurement accuracy, service life, and safety of this thermocouple in a high-temperature molten salt environment are significantly improved.

[0038] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A thermocouple for measuring high temperature chlorinated molten salts, characterized in that: The utility model provides a kind of temperature sensor, including protective sleeve (9), terminal box (7) is installed at one end of the protective sleeve (9), terminal disc (8) is installed inside the terminal box (7), terminal post (5) is installed on the terminal disc (8), thermocouple core is arranged inside the protective sleeve (9), the thermocouple core includes two electrodes (11), one end of the electrode (11) is welded together by laser, the other end of the electrode (11) is led out by wire (12) and connects on terminal post (5), the outside of electrode (11) and wire (12) is equipped with insulating sleeve (10).

2. The thermocouple for measuring a high-temperature molten salt according to claim 1, characterized by: The electrode (11) includes positive and negative, positive uses nickel-based alloy material with diameter 0.5mm, negative uses platinum rhodium alloy material with diameter 0.5mm, the outside surface of electrode (11) is wrapped with stainless material layer.

3. The thermocouple for measuring high temperature molten salt according to claim 1, wherein: The insulating sleeve (10) is high-temperature ceramic powder material with inner diameter 1.5mm and outer diameter 2.5mm.

4. The thermocouple for measuring high temperature molten salt according to claim 1, wherein: The welded end of electrode (11) is temperature measuring end (13), the material of temperature measuring end (13) uses platinum rhodium alloy, the terminal end (14) of wire (12) is arranged in terminal box (7) and is fixed by screw, and terminal disc (8) is made of ceramic material.

5. The thermocouple for measuring high temperature molten salt according to claim 1, wherein: The protective sleeve (9) is tantalum zirconium alloy pipe with wall thickness 4mm, inner diameter 10mm and outer diameter 20mm.

6. The thermocouple for measuring high temperature molten salt according to claim 1, wherein: Terminal box (7) is also installed with threading bolt (2), the end of threading bolt (2) is provided with washer (1), terminal box cover (4) is installed on the outside of terminal box (7), the outer wall of terminal box cover (4) is connected with terminal box (7) by chain (3), and insulating rubber sleeve (6) is installed on the inner wall of terminal box cover (4).

7. The thermocouple for measuring high temperature molten salt according to claim 1, wherein: Terminal box (7) is made of corrosion-resistant and explosion-proof polytetrafluoroethylene material.

8. The thermocouple for measuring high temperature molten salt according to claim 4, wherein: The terminal end (14) of wire (12) is sealed outside by high-temperature ceramic powder.

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