Heating device for thermocouple of crystallizer

Abstract

A high-temperature-resistant outer sleeve, a graphite heating sleeve and a heat-conducting ceramic sleeve of the device are sequentially sleeved, the two ends of an air blowing pipeline are connected with the high-temperature-resistant outer sleeve and a dry compressed air source respectively, and dry compressed air is blown in from one end of the high-temperature-resistant outer sleeve through the air blowing pipeline; the electromagnetic induction coil is respectively connected with the graphite heating sleeve and the electromagnetic heating device, and the graphite heating sleeve is heated through the electromagnetic heating device. The device overcomes the defects of thermocouple heating of a traditional crystallizer, provides an efficient, stable, high-temperature and accurate heating mode, realizes simultaneous heating of a plurality of thermocouples, and ensures that subsequent temperature detection equipment detects the temperature rise characteristics of the thermocouples at the same time and under the condition of the same input heat.

Description

Technical Field

[0001] This invention relates to the field of continuous casting crystallizer technology, and more particularly to a heating device for a crystallizer thermocouple. Background Technology

[0002] As an effective means of detecting anomalies such as molten steel leakage in continuous casting molds, the reliability of online thermocouple operation is a core key aspect of continuous casting mold monitoring. Offline monitoring of the stability of mold thermocouples has become a research focus and challenge.

[0003] After the crystallizer thermocouples pass offline individual testing, they are installed into the crystallizer copper plate assembly. There are generally three methods for heating the thermocouples assembled in the copper plate assembly. The first method uses oxy-acetylene heating to test the assembled thermocouples and confirm their reliability. This method can only heat a single thermocouple and cannot heat multiple thermocouples simultaneously. The second method is electric heating. After the heating wire generates heat, the heat is transferred to the copper plate surface using metal thermal conductivity or asbestos sheets to raise the temperature of the thermocouple. The limitation of this method is that the heating wire cannot provide a large heat source and cannot quickly raise the temperature to 1200℃. Also, because the copper plate surface around the thermocouple is protected by a coating, the heating time is generally more than two minutes. The third method is steam heating, with a temperature of 100℃. This method has a slow heating speed. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a heating and temperature rise device for thermocouples in crystallizers. This device overcomes the defects of traditional thermocouple heating in crystallizers, and provides an efficient, stable, high-temperature and accurate heating method, enabling multiple thermocouples to be heated simultaneously, and ensuring that subsequent temperature detection equipment can detect the temperature rise characteristics of thermocouples under the same time and the same input heat.

[0005] To solve the above-mentioned technical problems, the present invention provides a heating and temperature-raising device for a crystallizer thermocouple, comprising a high-temperature resistant jacket, a graphite heating jacket, a thermally conductive ceramic jacket, an electromagnetic induction coil, an electromagnetic heating device, an air blowing pipe, and a dry compressed air source. The high-temperature resistant jacket, the graphite heating jacket, and the thermally conductive ceramic jacket are sequentially fitted together. The two ends of the air blowing pipe are respectively connected to the high-temperature resistant jacket and the dry compressed air source. The dry compressed air is blown into the high-temperature resistant jacket from one end through the air blowing pipe, passes through the thermally conductive ceramic jacket, and exits from the other end of the high-temperature resistant jacket. The electromagnetic induction coil is connected to the graphite heating jacket and the electromagnetic heating device, and heats the graphite heating jacket through the electromagnetic heating device.

[0006] Furthermore, the electromagnetic induction coil is wound around a high-temperature resistant jacket to heat the graphite heating jacket, and the electromagnetic induction coil is equipped with a water-cooling pipe.

[0007] Furthermore, the heating temperature of the graphite heating jacket is 0–1500°C, and the dry compressed air outlet temperature of the high-temperature resistant jacket is 0–1200°C.

[0008] Furthermore, the normal operating temperature of the high-temperature resistant jacket is 1500℃, the resistivity of the graphite heating jacket is 11~13μΩm and the thermal conductivity is ≥85 W / mK, the thermal conductivity of the thermally conductive ceramic jacket is 90~110W / mK, the heating power of the electromagnetic heating device is 30 kW, and the pressure of the dry compressed air source is 0~0.5Mpa.

[0009] Because the heating and temperature-raising device for crystallizer thermocouples in this invention adopts the above-mentioned technical solution, namely, the high-temperature resistant jacket, graphite heating jacket, and thermally conductive ceramic jacket are sequentially fitted together. The two ends of the air blowing pipe are respectively connected to the high-temperature resistant jacket and a dry compressed air source. The dry compressed air is blown in from one end of the high-temperature resistant jacket through the air blowing pipe, passes through the thermally conductive ceramic jacket, and exits from the other end of the high-temperature resistant jacket. An electromagnetic induction coil is connected to both the graphite heating jacket and an electromagnetic heating device, and the graphite heating jacket is heated by the electromagnetic heating device. This device overcomes the shortcomings of traditional crystallizer thermocouple heating, providing an efficient, stable, high-temperature, and precise heating method, enabling simultaneous heating of multiple thermocouples, and ensuring that subsequent temperature detection equipment detects the temperature rise characteristics of the thermocouples under the same time and input heat conditions. Attached Figure Description

[0010] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the heating and temperature rise device for the thermocouple of the crystallizer according to the present invention. Detailed Implementation

[0011] Implementation, for example Figure 1 As shown, the heating and temperature-raising device for crystallizer thermocouples of the present invention includes a high-temperature resistant jacket 1, a graphite heating jacket 2, a thermally conductive ceramic sleeve 3, an electromagnetic induction coil 4, an electromagnetic heating device 5, an air blowing pipe 6, and a dry compressed air source 7. The high-temperature resistant jacket 1, the graphite heating jacket 2, and the thermally conductive ceramic sleeve 3 are sequentially fitted together. The two ends of the air blowing pipe 6 are respectively connected to the high-temperature resistant jacket 1 and the dry compressed air source 7. The dry compressed air is blown into the high-temperature resistant jacket 1 from one end through the air blowing pipe 6, passes through the thermally conductive ceramic sleeve 3, and is blown out from the other end of the high-temperature resistant jacket 1. The electromagnetic induction coil 4 is respectively connected to the graphite heating jacket 2 and the electromagnetic heating device 5, and heats the graphite heating jacket 2 through the electromagnetic heating device 5.

[0012] Preferably, the electromagnetic induction coil 4 is wound around the high-temperature resistant jacket 1 to heat the graphite heating jacket 2, and the electromagnetic induction coil 4 is equipped with a water-cooling pipe 41.

[0013] Preferably, the heating temperature of the graphite heating jacket 2 is 0-1500℃, and the temperature of the dry compressed air outlet 11 of the high-temperature resistant jacket 1 is 0-1200℃.

[0014] Preferably, the normal operating temperature of the high-temperature resistant jacket 1 is 1500℃, the resistivity of the graphite heating jacket 2 is 11-13μΩm and the thermal conductivity is ≥85 W / mK, the thermal conductivity of the thermally conductive ceramic jacket 3 is 90-110W / mK, the heating power of the electromagnetic heating device 5 is 30 kW, and the pressure of the dry compressed air source 7 is 0-0.5 MPa.

[0015] This device provides a highly efficient, stable, high-temperature, and precise heating method for copper plate assemblies with thermocouples assembled in crystallizers. It uses electromagnetic heating of graphite and dry compressed air as the power medium to transfer the high-temperature heat emitted by the graphite to the corresponding thermocouple locations on the copper plate, solving the problem of rapid and precise thermocouple heating. This heating method allows for the simultaneous heating of a specified number of thermocouples in different crystallizer configurations, addressing the issue of heating multiple thermocouples simultaneously and maintaining a uniform heat input. This enables subsequent temperature detection equipment to detect the temperature rise characteristics of the thermocouples under the same time and heat input conditions, effectively evaluating the quality and lifespan of the crystallizer thermocouples.

[0016] Figure 1 The diagram only shows a single electromagnetic heating device heating a single graphite heating jacket. For crystallizers with multiple thermocouples, the same electromagnetic heating device can simultaneously connect the copper plates of the thermocouple detection parts of multiple graphite heating jackets in series for heating, or multiple electromagnetic heating devices can be connected individually to graphite heating jackets for simultaneous heating.

[0017] When heating the thermocouples in the crystallizer using this device, it is preferable that the dry compressed air outlet of the high-temperature resistant jacket faces upwards toward the copper plate at the thermocouple detection point. Depending on the structural characteristics of different crystallizers, the copper plate can also be heated at high temperatures in any direction and angle. Graphite begins to oxidize at 400℃, and the oxidized graphite powder is easily carried away by the compressed air. To prevent the high-temperature oxidation of graphite from being carried away by the compressed air and affecting the temperature field of the electromagnetically heated graphite, this device uses a thermally conductive ceramic jacket to isolate the graphite heating jacket, ensuring the stability of the temperature field. The heating power of the electromagnetic heating equipment can be adjusted manually or by a PLC controller; the flow rate of the dry compressed air source can be adjusted manually or by a PLC controller. This device can simultaneously heat thermocouples according to different crystallizer thermocouple arrangements, up to four thermocouples can be heated simultaneously.

[0018] This device uses high-power electromagnetic heating of graphite material, reaching 1500℃. Compressed air is used as the heat transfer medium to transfer heat to the temperature detection area of ​​the thermocouple in the crystallizer, resulting in rapid heating of the copper plate and achieving a fast heating effect. The compressed air passes through a specific drying device to prevent moisture from affecting the heating effect. The dried compressed air is regulated by a flow control valve to ensure consistent heat transfer.

Claims

1. A heating and warming device for a crystallizer thermocouple, characterized by: The device comprises a high-temperature-resistant outer sleeve, a graphite heating sleeve, a heat-conducting ceramic sleeve, an electromagnetic induction coil, an electromagnetic heating device, a blowing pipeline and a dry compressed air source, the high-temperature-resistant outer sleeve, the graphite heating sleeve and the heat-conducting ceramic sleeve are successively sleeved, the blowing pipeline is connected with the high-temperature-resistant outer sleeve and the dry compressed air source at two ends respectively, dry compressed air is blown into one end of the high-temperature-resistant outer sleeve through the blowing pipeline, and is blown out from the other end of the high-temperature-resistant outer sleeve after passing through the heat-conducting ceramic sleeve, the electromagnetic induction coil is connected with the graphite heating sleeve and the electromagnetic heating device respectively, and the graphite heating sleeve is heated by the electromagnetic heating device.

2. The heating and temperature rising device for crystallizer thermocouple according to claim 1, characterized in that: The electromagnetic induction coil is wound on the high-temperature-resistant outer sleeve to heat the graphite heating sleeve, and the electromagnetic induction coil is provided with a water cooling pipeline.

3. The heating-up device for a crystallizer thermocouple according to claim 1 or 2, characterized in that: The heating temperature of the graphite heating sleeve is 0-1500 DEG C, and the dry compressed air outlet temperature of the high-temperature-resistant outer sleeve is 0-1200 DEG C.

4. The heating and temperature rising device for crystallizer thermocouple according to claim 3, characterized in that: The normal temperature-resistant working environment of the high-temperature-resistant outer sleeve is 1500 DEG C, the resistivity of the graphite heating sleeve is 11-13 mu Omega m, the heat conductivity coefficient is greater than or equal to 85 W / m.K, the heat conductivity coefficient of the heat-conducting ceramic sleeve is 90-110 W / m.K, the heating power of the electromagnetic heating device is 30 kilowatts, and the pressure of the dry compressed air source is 0-0.5 Mpa.

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