Calcium carbide furnace electrode temperature detection device

Abstract

The utility model discloses a calcium carbide furnace electrode temperature detection device which comprises a low-temperature temperature measurement assembly and a high-temperature temperature measurement assembly, the low-temperature temperature measurement assembly is fixed on an outer air duct, a probe of the low-temperature temperature measurement assembly is located between the outer air duct and an inner air duct, and the low-temperature temperature measurement assembly is located above a contact element. And the high-temperature temperature measuring assembly is arranged below the contact element. The closed calcium carbide furnace electrode temperature measuring device can avoid soft breakage or hard breakage accidents caused by poor roasting of the electrode due to manual observation factors, and provides powerful guarantee for safe and continuous smelting production.

Description

Technical Field

[0001] The utility model belongs to the technical field of measurement, and in particular relates to a temperature detection device for a calcium carbide furnace electrode. Background Art

[0002] Among all the equipment in a calcium carbide furnace, electrodes are the heart of the process. They serve as the primary transition material, converting electrical energy into thermal energy during the smelting process. They act as a bridge for energy conversion and are a crucial factor influencing the smelting process, product quality, output, power consumption, and production costs. In actual production, electrodes must withstand high temperatures, temperature rises, high stresses, and smoke damage. Therefore, electrode operating status is one of the most critical production process indicators. It impacts product quality and the safety, stability, and continuity of the entire production process.

[0003] During the calcium carbide furnace smelting process, it is usually based on visual observation and accumulated experience to judge whether the electrode sintering is normal. During smelting in a closed calcium carbide furnace, the electrode is sealed inside the furnace cover, and the operator cannot observe the surface temperature and roasting status of the electrode at any time. Generally, when the furnace needs to be stopped for processing, the roasting quality of the electrode can be manually observed, and the observation results vary with the experience of the observer. Generally, if the surface of the lowered electrode is found to be grayish white or dark but not red, it is well roasted; if the surface of the electrode is red, it may have been over-burned; if the surface is black, it means that it has not been roasted enough. This rough judgment often determines whether the electrode sintering is normal only after the electrode is pressed down. If the electrode is too soft, it may cause a soft fracture accident once it is pressed down; over-sintering may cause serious burn damage to the conductive components of the electrode shell, affecting the lowering of the electrode. Utility Model Content

[0004] In order to solve the above problems, the utility model provides a calcium carbide furnace electrode temperature detection device, which can avoid soft or hard break accidents of electrodes caused by poor roasting due to manual observation factors, and provide a closed calcium carbide furnace electrode temperature measurement device that provides strong guarantee for safe and continuous smelting production.

[0005] The embodiments of the present invention are achieved through the following technical solutions:

[0006] A calcium carbide furnace electrode temperature detection device includes a low-temperature temperature measuring component and a high-temperature temperature measuring component. The low-temperature temperature measuring component is fixed to an outer wind tube, and a probe of the low-temperature temperature measuring component is located between the outer wind tube and the inner wind tube. The low-temperature temperature measuring component is located above a contact element, and the high-temperature temperature measuring component is installed below the contact element.

[0007] In one embodiment of the present invention, the low-temperature temperature measurement component includes a metal-coated high-temperature optical fiber sensor.

[0008] In one embodiment of the present invention, the probes of the metal-coated high-temperature optical fiber sensor are distributed around the electrode and are provided with at least three probes.

[0009] In one embodiment of the present invention, the high-temperature temperature measurement component includes a platinum-rhodium thermocouple.

[0010] In one embodiment of the present invention, the platinum-rhodium thermocouple is installed on the cover of the calcium carbide furnace.

[0011] The technical solution of the utility model has at least the following advantages and beneficial effects:

[0012] The utility model adopts a combination of a low-temperature temperature measuring device and a high-temperature temperature measuring device to perform segmented temperature measurement, which can avoid soft or hard break accidents of electrodes caused by poor roasting due to manual observation factors, and provides a closed calcium carbide furnace electrode temperature measuring device that effectively guarantees safe and continuous smelting production. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0014] Figure 1 This is a schematic diagram of the temperature detection device for the electrode of the calcium carbide furnace of the present invention;

[0015] Figure 2 for Figure 1 A magnified schematic diagram of the installation location of the metal-coated high-temperature fiber optic sensor probe and the platinum-rhodium thermocouple.

[0016] Icon: 1-inner air cylinder, 2-outer air cylinder, 3-electrode, 4-metal-coated high-temperature optical fiber sensor probe, 5-platinum-rhodium thermocouple, 6-contact element, 7-calcium carbide furnace cover. DETAILED DESCRIPTION

[0017] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0018] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0019] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0020] In the description of the present invention, it should be noted that if the terms "inside" and "outside" appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the utility model product is usually placed when in use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0021] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "dispose," "install," "configure," and "connect" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0022] Example

[0023] The electrode baking involved in this application has three stages, namely:

[0024] (1) Electrode softening stage: The temperature range is 100℃~250℃. This stage has several characteristics: increased resistance, decreased thermal stability, volume change, chemical composition change, thermal conductivity change, increased sensitivity to external pressure, and increased sensitivity to environmental factors. This stage is the process of the electrode paste transforming from solid to liquid. During this process, the physical and chemical properties of the electrode paste will undergo significant changes, and these changes may affect the performance and stability of the electrode. Therefore, during the electrode roasting process, this stage needs to be carefully monitored and controlled to ensure the performance of the electrode and the stability of the production process.

[0025] (2) Volatilization stage: The temperature range is 650℃~750℃. During this stage, a large amount of volatiles are released. As the amount of volatiles decreases, the thermal conductivity of the electrode paste may improve. The density of the electrode paste increases. The structure of the electrode paste may change from loose granular to a more compact sintered structure. The thermal stability of the electrode paste may improve.

[0026] (3) Sintering stage: The temperature range is 800℃~1000℃ or even higher. During this stage, the volatile matter decreases, the structure changes, the carbon molecules gradually arrange into a more ordered graphite structure, the mechanical strength increases, and the resistivity decreases.

[0027] Please refer to Figure 1-2 In response to the characteristics of electrode roasting and the shortcomings of existing technologies, this embodiment provides a calcium carbide furnace electrode temperature detection device, including a low-temperature temperature measurement component and a high-temperature temperature measurement component. The distance between the outer air duct 2 and the inner air duct 1 is approximately 2-3 cm. The bottom of the inner air duct 1 is connected to the contact element 6, which is existing technology. The low-temperature temperature measurement component adopts a structure including a metal-coated high-temperature optical fiber sensor probe 4. The metal-coated high-temperature optical fiber sensor has a temperature measurement range of -270°C to 700°C, which basically meets the requirements of the electrode softening stage and volatilization stage. The metal-coated high-temperature optical fiber sensor adopts an existing finished product, which includes a probe, a metal-coated high-temperature optical fiber, and other supporting components. The metal-coated high-temperature optical fiber sensor probes 4 are distributed around the electrode 3, and at least three are provided. During the softening phase, electrode 3 is located approximately 400-600 mm above contact element 6. Therefore, three mounting holes with a diameter of approximately 20 mm are drilled in this location. The optical fiber is then positioned and fixed to outer air duct 2, with the probe located between outer air duct 2 and inner air duct 1. During the volatilization phase, electrode 3 is located approximately 3 / 5 of the upper portion of contact element 6. The temperature rises from 120-200°C to 550-600°C. Three mounting holes with a diameter of approximately 20 mm are also drilled in this location. The optical fiber is then positioned and fixed to outer air duct 2, with the temperature probe located between outer air duct 2 and inner air duct 1. Fiber optic temperature measurement is used in both stages, so a temperature demodulator is used to provide a light source for the metal-coated high-temperature fiber optic sensor. The optical signal returned by the fiber optic temperature sensor is converted into a digital signal for display, storage, and processing, and communication with external devices.

[0028] Traditional temperature measuring devices such as thermocouples need to be in direct contact with the object being measured, and the welding of the two hot electrodes 3 of the thermocouple must be firm. For the above reasons, the thermocouple cannot be installed in the inner wind tube 1 to directly measure the temperature of the electrode 3. If the thermocouple is installed on the outer wind tube 2, it will be difficult to select the measurement point during the softening and volatilization stages of the electrode 3, and the error of the measurement data will be extremely large. However, the working principle of the metal-coated high-temperature optical fiber sensor probe 4 is based on the thermal characteristics of the optical fiber. The temperature measurement is achieved by changing the optical characteristics of the temperature sensing element in the optical fiber when it is affected by temperature. The optical fiber probe is small and can be installed between the inner and outer wind tubes 2 of the electrode 3 to avoid the temperature measuring device being affected by the up and down movement of the electrode 3, and can measure the temperature change of the electrode 3 very well. In addition, the optical fiber has high sensitivity and good anti-interference performance. It can sense the temperature change of the electrode 3 very quickly and better grasp the roasting condition of the electrode 3.

[0029] In this embodiment, the high-temperature temperature measurement assembly includes a platinum-rhodium thermocouple 5. Specifically, during the sintering stage, the temperature rises from 650-750°C to 800-1000°C, approximately below the contact element 6. In this embodiment, the platinum-rhodium thermocouple 5 is installed on the calcium carbide furnace cover 7. To address strong magnetic field interference and prevent the thermocouple from transmitting strong current to the secondary display instrument or PLC controller, each thermocouple is connected to a temperature transmitter via compensation wires. The temperature signal collected by each thermocouple is converted into a standard current signal by the temperature transmitter and then connected to the secondary control display instrument or PLC controller via twisted-pair shielded cable. The platinum-rhodium thermocouple 5 has a wide temperature measurement range, relatively stable performance, and a large measurement range. It can continuously measure temperatures from 0 to +1600°C. This temperature range is roughly located between the center and below the contact element 6, making it easy to select the detection point. It is also easy to install and can greatly improve the accuracy of the temperature detection.

[0030] The utility model adopts a combination of a low-temperature temperature measuring device and a high-temperature temperature measuring device to perform segmented temperature measurement, which can avoid soft or hard break accidents of the electrode 3 caused by poor roasting due to manual observation factors, and provides a closed calcium carbide furnace electrode 3 temperature measuring device that effectively guarantees safe and continuous smelting production.

[0031] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A calcium carbide furnace electrode temperature detection device, characterized in that: It includes a low-temperature temperature measuring component and a high-temperature temperature measuring component. The low-temperature temperature measuring component is fixed to the outer wind tube. The probe of the low-temperature temperature measuring component is located between the outer wind tube and the inner wind tube. The low-temperature temperature measuring component is located above the contact element, and the high-temperature temperature measuring component is installed below the contact element.

2. The calcium carbide furnace electrode temperature detection device according to claim 1, characterized in that: The low-temperature temperature measurement component includes a metal-coated high-temperature optical fiber sensor.

3. The calcium carbide furnace electrode temperature detection device according to claim 2, characterized in that: The probes of the metal coating layer high temperature optical fiber sensor are distributed around the electrode and are provided with at least three probes.

4. The calcium carbide furnace electrode temperature detection device according to claim 1, characterized in that: The high temperature temperature measurement component includes a platinum-rhodium thermocouple.

5. The calcium carbide furnace electrode temperature detection device according to claim 4, characterized in that: The platinum-rhodium thermocouple is installed on the calcium carbide furnace cover.

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