A high-temperature liquid metal in-situ, continuous, contact temperature measurement device

Abstract

The present invention discloses an in-situ, continuous, contact temperature measurement device for high-temperature liquid metal. The device includes a probe head and a probe rod, which are connected by a connector. A coated thermocouple is inserted into the probe head. An opening is provided at the end of the probe head that contacts the high-temperature liquid metal. A temperature probe of the thermocouple is inserted into the opening. The temperature probe of the thermocouple is coated with a single or multi-layer composite coating material. The probe head is provided with two through-holes, through which lead wires of the thermocouple are led out. The probe rod is provided with a wire cavity and a cooling cavity, which is provided around the wire cavity. A flowing cooling medium is introduced into the cooling cavity to cool the wire cavity. A thermocouple compensation wire is inserted into the wire cavity. The lead wire of the thermocouple is connected to the thermocouple compensation wire. The output end of the thermocouple compensation wire is connected to a temperature measuring instrument via the lead wire. The present invention can perform online, continuous, real-time, and accurate temperature measurement of high-temperature liquid metal.

Description

Technical Field

[0001] The present invention relates to the technical field of high-temperature liquid metal temperature measurement, and in particular to a high-temperature liquid metal in-situ, continuous, contact temperature measurement device. Background Art

[0002] The metal production process is characterized by high-temperature melting, making temperature measurement and control crucial. Currently, there are two main methods for in-situ temperature measurement of hot liquid metal: thermocouple measurement and blackbody cavity optical measurement. The main drawback of thermocouple measurement is that the sensor is susceptible to burnout, oxidation, corrosion, and contamination at high temperatures, typically requiring multiple layers of protective tubes. This results in slower response rates and compromises dynamic measurement accuracy. Blackbody cavity optical measurement relies heavily on emissivity and a pristine transmission path. High temperatures, phase transitions in the cavity material, and multiphase flow conditions such as smoke and steam in the transmission path, significantly impact the cavity's radiative heat transfer, reflectivity, and scattering, making actual measurement accuracy difficult to meet production requirements. While methods such as blowing nitrogen into the inner tube of the temperature gun can address this issue to some extent, they also introduce new interference factors, such as gas cooling. Therefore, continuous, real-time, and accurate temperature measurement of hot liquid metal remains a challenge in real-world measurement environments. Summary of the Invention

[0003] The purpose of the present invention is to provide an in-situ, continuous, contact temperature measuring device for high-temperature liquid metal, so as to realize online, continuous, real-time and accurate measurement of the temperature of high-temperature liquid metal under extreme conditions such as on-site smelting of high-temperature liquid metal, strong erosion and strong oxidation during the production process.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] A high-temperature liquid metal in-situ, continuous, contact temperature measurement device, the device comprising: a probe gun head and a probe gun rod, the probe gun head and the probe gun rod being connected by a connector, a coated thermocouple being passed through the probe gun head, an opening being provided at one end of the probe gun head in contact with the high-temperature liquid metal, a temperature measuring probe of the thermocouple being passed through the opening, the temperature measuring probe of the thermocouple being coated with a single-layer or multi-layer composite coating material, two through holes being provided in the probe gun head, lead wires of the thermocouple being led out from the through holes; a wire cavity and a cooling cavity being provided in the probe gun rod, the cooling cavity being provided around the wire cavity, a flowing cooling medium being passed into the cooling cavity to cool the wire cavity; a thermocouple compensation wire being passed through the wire cavity, the lead wire of the thermocouple being connected to the thermocouple compensation wire, and the output end of the thermocouple compensation wire being connected to a temperature measuring instrument through the lead wire.

[0006] Furthermore, the cooling cavity includes an intermediate layer tube and an outer layer tube, the intermediate layer tube is arranged around the wire cavity, the intermediate layer tube and the outer layer tube are connected and partially overlapped; the intermediate layer tube is longer than the outer layer tube, the part where the intermediate layer tube and the outer layer tube do not overlap is provided with a cooling medium outlet, and the outer layer tube is provided with a cooling medium inlet, and a certain gap is left between the outer layer tube and the intermediate layer tube, and between the intermediate layer tube and the wire cavity, forming a circulation path for the cooling medium.

[0007] Furthermore, the lead wire of the thermocouple is fixedly connected to the thermocouple compensation wire by welding or crimping.

[0008] Furthermore, the gap between the thermocouple and the probe head is filled with refractory material.

[0009] Furthermore, the temperature measuring probe of the thermocouple is flush with or slightly lower than the end surface of the probe gun head.

[0010] Furthermore, the coating of the coated thermocouple is one or more combinations of silicon nitride, titanium carbide, hafnium dioxide, zirconium dioxide, zirconium diboride, and magnesium oxide; and the coating is prepared by a sputtering process combined with a sol-gel method.

[0011] Furthermore, a hook is provided at one end of the gun probe rod away from the gun probe head.

[0012] Furthermore, the type of the thermocouple is a tungsten-rhenium thermocouple, a K-type thermocouple, an S-type thermocouple, a B-type thermocouple or an N-type thermocouple; and the shape of the thermocouple is a wire or a sheet.

[0013] Furthermore, the probe head is made of refractory material, and the external structure of the probe head is square, circular, elliptical or other irregular shapes; the length and thickness of the probe head are designed according to the surface working conditions of the high-temperature liquid metal and the insertion depth requirements.

[0014] Furthermore, the connecting piece is fixedly connected to the probe gun head and the probe gun rod by means of threads, crimping, snap-fitting or tying.

[0015] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects: the in-situ, continuous, contact temperature measurement device for high-temperature liquid metal provided by the present invention installs a coated thermocouple on the probe head, which is simple and convenient to install and replace. The probe head is fixed to the probe rod with water cooling or air cooling function through a connector, thereby realizing online continuous measurement of the temperature of high-temperature liquid metal under extreme conditions such as on-site smelting of high-temperature liquid metal, strong scouring, and strong oxidation during production; the coating can prevent the high-temperature liquid metal from oxidizing, scouring and corroding the thermocouple body, thereby increasing the service life of the thermocouple, realizing continuous, long-term temperature measurement and repeated use of the thermocouple, and ensuring measurement accuracy; the probe head and probe rod are independent modules, and the probe head and probe rod can be configured with appropriate lengths according to the temperature measurement scenario, which are easy to replace and have strong versatility.

[0016] The present invention is applicable to in-situ, continuous, contact temperature measurement of high-temperature liquid metals, such as molten steel, molten iron, molten aluminum, molten copper, and molten zinc, during smelting and production, with a temperature measurement range of 700-2000°C. The temperature measuring device of the present invention can be inserted into the high-temperature liquid metal either vertically or at an angle for temperature measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 Schematic diagram of the structure of a thermocouple with a coating according to the present invention;

[0019] Figure 2 It is a cross-sectional view of the in-situ, continuous, contact temperature measurement device for high-temperature liquid metal of the present invention;

[0020] Figure 3 It is a schematic diagram of the three-dimensional structure of the in-situ, continuous, contact temperature measurement device for high-temperature liquid metal of the present invention.

[0021] Description of reference numerals:

[0022] 1. Refractory material; 2. Thermocouple; 3. Probe tip; 4. Connectors; 5. Thermocouple compensation wire; 6. Probe rod; 7. Cooling medium inlet; 8. Cooling medium outlet; 9. Hook; 10. Lead wire; 11. Temperature measuring instrument

[0023] 2-1, temperature probe; 6-1, outer tube; 6-2, middle tube; 6-3, wire cavity. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] The purpose of the present invention is to provide a device for in-situ, continuous and contact temperature measurement of high-temperature liquid metal smelting and production processes.

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] like Figure 1-3 As shown, the present invention provides an in-situ, continuous, contact temperature measurement device for high-temperature liquid metal, which includes: a probe gun head 3 and a probe gun rod 6, the probe gun head 3 and the probe gun rod 6 are connected by a connector 4, a coated thermocouple 2 is passed through the probe gun head 3, and an opening is provided at the end of the probe gun head 3 that contacts the high-temperature liquid metal, and the temperature measuring probe 2-1 of the thermocouple 2 is passed through the opening, and the temperature measuring probe of the thermocouple 2 is coated with a single-layer or multi-layer composite coating material that is resistant to high temperature, oxidation-resistant, erosion-resistant and has good thermal conductivity.

[0028] The probe head 3 is provided with two through holes. The through holes inside the probe head 3 are prefabricated holes, which are convenient for installing and replacing the thermocouple 2. The thermocouple 2 is a U-shaped structure, and the lead wire of the thermocouple 2 is led out from the through hole. The probe rod 6 is provided with a wire cavity 6-3 and a cooling cavity. The cooling cavity is arranged around the wire cavity 6-3, and a flowing cooling medium is passed into the cooling cavity to cool the wire cavity 6-3. The thermocouple compensation wire 5 is passed through the wire cavity 6-3, and the lead wire of the thermocouple 2 is connected to the thermocouple compensation wire 5. The output end of the thermocouple compensation wire 5 is connected to the temperature measuring instrument 11 through the lead wire 10. The temperature measuring instrument 11 can realize real-time acquisition and display of temperature measurement data, and can also transmit it to other designated devices in various communication forms.

[0029] For example, the cooling medium is water or gas. Preferably, water is used as the cooling medium so that the probe rod 6 has a water cooling function.

[0030] Specifically, the cooling chamber comprises an intermediate tube 6-2 and an outer tube 6-1. The intermediate tube 6-2 surrounds the conductor cavity 6-3 and is connected to and partially overlaps the outer tube 6-1. The intermediate tube 6-2 is longer than the outer tube 6-1. A cooling medium outlet 8 is provided in the portion of the intermediate tube 6-2 that does not overlap with the outer tube 6-1. The outer tube 6-1 is provided with a cooling medium inlet 7. A certain gap is left between the outer tube 6-1 and the intermediate tube 6-2, and between the intermediate tube 6-2 and the conductor cavity 6-3, forming a circulation path for the cooling medium. The conductor cavity 6-3 is the inner tube. The probe rod 6 is made of stainless steel. The inner tube, intermediate tube 6-2, and outer tube 6-1 are welded together and are all made of steel pipe.

[0031] The lead wire of the thermocouple 2 is fixedly connected to the thermocouple compensation wire 5 by welding or crimping.

[0032] The gap between the coated thermocouple 2 and the probe head 3 is filled with a refractory material 1 to prevent high-temperature liquid metal from passing through the gap and causing corrosion and oxidation to the thermocouple 2, thereby increasing the life of the thermocouple 2. The refractory material 1 has good thermal conductivity.

[0033] The temperature probe 2-1 of the thermocouple 2 is flush with or slightly lower than the end face of the probe head 3. This reduces the impact of strong erosion on the temperature probe 2-1 of the thermocouple 2 during the high-temperature liquid metal smelting process, thereby increasing the life of the thermocouple 2. When the measuring end of the thermocouple 2 is lower than the end face of the probe head 3, the gap can be filled with refractory material 1.

[0034] The coating of the coated thermocouple 2 is one or more of silicon nitride, titanium carbide, hafnium dioxide, zirconium dioxide, zirconium diboride, and magnesium oxide. The coating is prepared by sputtering combined with a sol-gel process. The coating can be a single layer or a multi-layer composite coating material.

[0035] The type of the thermocouple 2 is a tungsten-rhenium thermocouple, a K-type thermocouple, an S-type thermocouple, a B-type thermocouple or an N-type thermocouple, and may also be other types; the shape of the thermocouple 2 may be a wire or a sheet.

[0036] The probe tip 3 is made of refractory material and can be square, circular, oval, or other irregular shapes. Its length and thickness can be arbitrarily designed based on the surface conditions of the high-temperature liquid metal and the required insertion depth. In this embodiment of the present invention, the probe tip is circular.

[0037] The interior of the connecting member 4 is a hollow structure, and is fixedly connected to the probe gun head 3 and the probe gun rod 6 by means of threads, crimping, snap-fitting or tying.

[0038] The end of the gun probe rod 6 away from the gun probe head 3 is provided with a hook 9 to facilitate the hanging of the device and facilitate use.

[0039] The device provided by the present invention can be used for in-situ, continuous, and contact temperature measurement of various liquid metals, including molten steel, molten iron, molten aluminum, molten copper, and molten zinc, with a temperature measurement range of 700-2000°C. Depending on the type of liquid metal, the continuous temperature measurement time can range from a few minutes to hundreds of minutes. The temperature measurement device of the present invention can be inserted into high-temperature liquid metal for temperature measurement, either vertically or at an angle.

[0040] The assembly process of the high-temperature liquid metal in-situ, continuous, contact temperature measurement device includes the following steps:

[0041] According to the high-temperature liquid metal smelting furnace and the depth of the liquid metal, smelting impurities, and the thickness of the waste slag, select the appropriate length of the probe head 3 and the appropriate length of the probe rod 6 and assemble them through the connector 4;

[0042] Select the appropriate type of coated thermocouple 2 according to the smelting temperature range of the high-temperature liquid metal, such as tungsten-rhenium thermocouple, K-type thermocouple, S-type thermocouple, B-type thermocouple, N-type thermocouple. The shape of the thermocouple can be wire-shaped or sheet-shaped;

[0043] Install the coated thermocouple 2 into the probe head 3 and fill the gap after installation with refractory material 1;

[0044] According to the type of thermocouple, select the corresponding thermocouple compensation wire 5, and fix the thermocouple lead wire to the thermocouple compensation wire 5 by welding or crimping;

[0045] The probe head 3 and the probe rod 6 are fixedly connected by the connecting piece 4;

[0046] Set up a water cooling device to provide a cold water source, connect the water outlet of the water cooling device to the cooling medium inlet 7 of the probe rod 6, and connect the water inlet to the cooling medium outlet 8 of the probe rod 6, and confirm whether the water cooling device is working properly and whether the water channel is leaking by means of a trial run;

[0047] According to the temperature test scenario and the length and weight of the temperature measuring device, the temperature measuring device can be inserted into the high-temperature liquid metal for continuous and contact temperature measurement by means of hoisting or mechanical operation. The temperature measuring device can be inserted into the high-temperature liquid metal vertically or tilted. The length of the probe head 3 should be selected to ensure that it is long enough to meet the needs of high-temperature liquid metal temperature measurement.

[0048] Before the temperature measuring device is inserted into the high-temperature liquid metal, the water cooling device is turned on and the temperature data collection is started at the same time to achieve continuous and contact temperature measurement.

[0049] The present invention is applicable to in-situ, continuous, contact temperature measurement of high-temperature liquid metals, such as molten steel, molten iron, molten aluminum, molten copper, and molten zinc, during smelting and production, with a temperature measurement range of 700-2000°C. The temperature measuring device of the present invention can be inserted into the high-temperature liquid metal either vertically or at an angle for temperature measurement.

[0050] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A high-temperature liquid metal in-situ, continuous, contact temperature measurement device, characterized in that: include: A probe gun head (3) and a probe gun rod (6), wherein the probe gun head (3) and the probe gun rod (6) are connected via a connector (4), a thermocouple (2) with a coating is provided in the probe gun head (3), an end of the probe gun head (3) in contact with the high-temperature liquid metal is provided with an opening, a temperature probe of the thermocouple (2) is provided in the opening, the temperature probe of the thermocouple (2) is coated with a single layer or multiple layers of composite coating material, two through holes are provided in the probe gun head (3), and the lead wires of the thermocouple (2) are provided. Leading out from the through hole; a wire cavity (6-3) and a cooling cavity are provided in the probe rod (6); the cooling cavity is provided around the wire cavity (6-3); a flowing cooling medium is passed into the cooling cavity to cool the wire cavity (6-3); a thermocouple compensation wire (5) is passed through the wire cavity (6-3); the lead wire of the thermocouple (2) is connected to the thermocouple compensation wire (5), and the output end of the thermocouple compensation wire (5) is connected to the temperature measuring instrument (11) through the lead wire (10); The cooling cavity comprises an intermediate layer tube (6-2) and an outer layer tube (6-1); the intermediate layer tube (6-2) is arranged around the wire cavity (6-3); the intermediate layer tube (6-2) and the outer layer tube (6-1) are connected and partially overlapped; the intermediate layer tube (6-2) is longer than the outer layer tube (6-1); a cooling medium outlet (8) is provided at a portion where the intermediate layer tube (6-2) and the outer layer tube (6-1) do not overlap; a cooling medium inlet (7) is provided on the outer layer tube (6-1); a certain gap is left between the outer layer tube (6-1) and the intermediate layer tube (6-2), and between the intermediate layer tube (6-2) and the wire cavity (6-3), forming a circulation path for the cooling medium; The lead wire of the thermocouple (2) and the thermocouple compensation wire (5) are fixedly connected by welding or crimping.

2. The in-situ, continuous, contact temperature measurement device for high-temperature liquid metal according to claim 1, characterized in that: The gap between the thermocouple (2) and the probe head (3) is filled with refractory material (1).

3. The in-situ, continuous, contact temperature measurement device for high-temperature liquid metal according to claim 1, characterized in that: The temperature measuring probe of the thermocouple (2) is flush with the end surface of the probe head (3) or slightly lower than the end surface of the probe head (3).

4. The in-situ, continuous, contact temperature measurement device for high-temperature liquid metal according to claim 1, characterized in that: The coating of the thermocouple (2) is one or more combinations of silicon nitride, titanium carbide, hafnium dioxide, zirconium dioxide, zirconium diboride, and magnesium oxide; the coating is prepared by a sputtering process combined with a sol-gel method.

5. The high-temperature liquid metal in-situ, continuous, contact temperature measurement device according to claim 1, characterized in that: A hook (9) is provided at one end of the gun probe rod (6) away from the gun probe head (3).

6. The high-temperature liquid metal in-situ, continuous, contact temperature measurement device according to claim 1, characterized in that: The type of the thermocouple (2) is a tungsten-rhenium thermocouple, a K-type thermocouple, an S-type thermocouple, a B-type thermocouple or an N-type thermocouple; the shape of the thermocouple (2) is a wire or a sheet.

7. The in-situ, continuous, contact temperature measurement device for high-temperature liquid metal according to claim 1, characterized in that: The probe head (3) is made of refractory material, and the outer structure of the probe head (3) is square, circular, oval or other irregular shapes; the length and thickness of the probe head (3) are designed according to the surface working conditions of high-temperature liquid metal and the insertion depth requirements.

8. The high-temperature liquid metal in-situ, continuous, contact temperature measurement device according to claim 1, characterized in that: The connecting piece (4) is fixedly connected to the probe gun head (3) and the probe gun rod (6) by means of threading, crimping, snapping or tying.

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