Converter continuous temperature measurement method

Abstract

The invention relates to the technical field of ferrous metallurgy high-temperature metering, in particular to a converter continuous temperature measuring method, according to the method, temperature measurement is completed through a continuous temperature measuring device, the continuous temperature measuring device comprises a temperature measuring thermocouple, a thermocouple seating brick and a temperature measuring displayer, a temperature measuring calculation program is arranged in the temperature measuring displayer, and the thermocouple seating brick is arranged in the temperature measuring displayer. The method has the advantages that the advantages of non-contact temperature measurement and contact temperature measurement are combined, measurement defects are made up in a theoretical calculation mode, continuous temperature measurement of the converter is achieved, the temperature measurement efficiency is high, the temperature measurement accuracy is high, and the temperature measurement accuracy is high. And the temperature measuring device is long in service life.

Description

Technical Field

[0001] The present invention relates to the technical field of high-temperature measurement in iron and steel metallurgy, and in particular to a continuous temperature measurement method for a converter. Background Art

[0002] In the converter steelmaking process, the converter temperature is a key factor affecting the quality of the ingots, production organization and smelting costs of the steelmaking process. However, in the traditional converter smelting process, the reaction process in the converter is relatively complex, and different reaction processes and different kinetic processes of the same reaction occur in an intertwined manner, making it difficult to accurately judge the temperature in the converter.

[0003] Existing temperature detection methods are mainly divided into contact and non-contact temperature measurement. While contact temperature measurement can ensure accurate measurement in converter applications, the molten steel severely erodes the temperature measuring device, which cannot guarantee the lifespan of the temperature measuring equipment. The temperature measuring device is easily damaged, resulting in inaccurate temperature measurements, increasing the processing pressure of subsequent processes and reducing the quality of subsequent products. Non-contact temperature measurement can ensure the lifespan of the temperature measuring equipment, but due to the large amount of flue gas in the converter, non-contact temperature measurement has low accuracy and requires repeated verification. This is labor-intensive and inefficient. Therefore, a temperature measurement method that can ensure continuous temperature measurement accuracy and extend the lifespan of the temperature measuring equipment is urgently needed. Summary of the Invention

[0004] In order to overcome the shortcomings of the existing technology, the present invention provides a continuous temperature measurement method for a converter. A temperature measuring thermocouple is arranged on the converter to measure the converter temperature in real time. The temperature of the molten steel in the converter is displayed in real time on a temperature measuring display after calculation by a temperature measurement calculation program, thereby combining the advantages of non-contact temperature measurement and contact temperature measurement, and using theoretical calculation to make up for measurement defects, thereby realizing continuous temperature measurement of the converter, high temperature measurement efficiency, high temperature measurement accuracy, and long service life of the temperature measuring device.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A method for continuous temperature measurement of a converter is provided. The method performs temperature measurement by a continuous temperature measurement device. The continuous temperature measurement device includes a temperature measuring thermocouple, a thermocouple base brick, and a temperature display. The temperature display is provided with a temperature measurement calculation program. The temperature measurement calculation program includes two parts: heat flux calibration and temperature measurement calibration calculation. The specific contents of the method for continuous temperature measurement of a converter include the following:

[0007] S1. Heat flux calibration: Before using the continuous temperature measuring device, the actual temperature T b The temperature T measured by the continuous temperature measuring device aThe heat flux density parameters in are calibrated; the heat flux density calibration value Q is calculated by the temperature measurement calculation program, and the heat flux density calibration value Q calculation formula is:

[0008] Q=λ(T b -T a ) / δ;

[0009] Where: δ is the distance between the front end of the temperature measuring thermocouple and the molten steel; λ is the thermal conductivity of the refractory material used;

[0010] S2. Continuous temperature measurement: During the converter smelting process, the temperature measuring thermocouple continuously measures the real-time temperature T in the converter. k ;

[0011] S3. Calibration calculation: According to the heat flux density calibration value Q, the real-time temperature T of the molten steel in the converter is obtained. s ;

[0012] T s =(Q·δ) / λ+T k ;

[0013] S4. Temperature display: The temperature T is displayed on the temperature display s .

[0014] Furthermore, the temperature measuring thermocouples are arranged along the outer arc of the converter rear furnace body, at a height of the converter ear axis and the center line of the furnace bottom, and 4 to 6 are evenly arranged along the arc surface.

[0015] Furthermore, the temperature measuring thermocouple is installed on the thermocouple seat brick, and the front end of the temperature measuring thermocouple is 400 to 1000 mm away from the inner side of the converter lining brick.

[0016] Furthermore, the thermal conductivity coefficient λ of the refractory material is: magnesia carbon brick: λ=1.12; alumina carbon brick: λ=1.56; high alumina brick: λ=1.2; magnesia chrome brick: λ=1.25.

[0017] Furthermore, the actual measured temperature T b Measured by sub-lance.

[0018] Furthermore, a thickness gauge is provided at the front end of the temperature measuring thermocouple to measure the distance δ between the front end of the temperature measuring thermocouple and the molten steel.

[0019] Furthermore, the temperature T displayed in step S4 is s The steps S2 to S3 are displayed continuously in real time.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1) The temperature measuring thermocouple is set on the thermocouple base brick, and the temperature measurement process does not directly contact the molten steel, which prevents the continuous temperature measuring device from being damaged by the molten steel erosion, prolongs the service life of the continuous temperature measuring device, prolongs the maintenance cycle of the continuous temperature measuring device, improves the continuity and stability of the converter temperature measurement, and reduces the workload of the operator.

[0022] 2) Contact temperature measurement is used to calibrate the non-contact temperature measurement value of the continuous temperature measurement device. Combining the advantages of non-contact temperature measurement and contact temperature measurement, theoretical calculation is used to make up for the shortcomings of the measurement method, thereby realizing continuous temperature measurement of the converter, real-time temperature measurement display, high temperature measurement accuracy, high temperature measurement efficiency, and long service life of the temperature measurement device.

[0023] 3) It can realize real-time online temperature detection of the converter, provide technical reserves for realizing intelligent smelting of the converter, improve the converter endpoint hit rate, reduce the pressure of post-processing, and improve product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of a converter continuous temperature measurement device according to the present invention.

[0025] Figure 2 It is a partially enlarged schematic diagram of the temperature measuring thermocouple provided by the present invention.

[0026] In the figure: 1. Temperature measuring thermocouple; 2. Thermocouple holder brick; 3. Converter; δ. Distance between the front end of the temperature measuring thermocouple and the molten steel. DETAILED DESCRIPTION

[0027] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings:

[0028] like Figure 1-Figure 2 As shown, a method for continuous temperature measurement of a converter is provided. The method completes the temperature measurement by a continuous temperature measurement device. The continuous temperature measurement device includes a temperature measuring thermocouple 1, a thermocouple base brick 2, and a temperature measuring display. The temperature measuring display is provided with a temperature measurement calculation program. The temperature measurement calculation program includes two parts: heat flux calibration and temperature measurement calibration calculation. The specific contents of the method for continuous temperature measurement of a converter include the following:

[0029] S1. Heat flux calibration: Before using the continuous temperature measuring device, the actual temperature T is measured by the converter 3. b The temperature T measured by the continuous temperature measuring device a The heat flux density parameters in are calibrated; the heat flux density calibration value Q is calculated by the temperature measurement calculation program, and the heat flux density calibration value Q calculation formula is:

[0030] Q=λ(T b -T a ) / δ;

[0031] Where: δ is the distance between the front end of the temperature measuring thermocouple 1 and the molten steel; λ is the thermal conductivity of the refractory material used;

[0032] S2. Continuous temperature measurement: During the smelting process of converter 3, the temperature measuring thermocouple 1 continuously measures the real-time temperature T in the converter. k ;

[0033] S3. Calibration calculation: According to the heat flux calibration value Q, the real-time temperature T of the molten steel in the converter 3 is obtained. s ;

[0034] T s =(Q·δ) / λ+T k ;

[0035] S4. Temperature display: The temperature T is displayed on the temperature display s .

[0036] The temperature measuring thermocouples are arranged along the outer arc of the converter rear furnace body, with a height being the center line of the converter ear axis and the furnace bottom, and 4 to 6 thermocouples are evenly arranged along the arc surface.

[0037] Furthermore, the temperature measuring thermocouple 1 is installed on the thermocouple base brick 2, and the front end of the temperature measuring thermocouple 1 is 400 to 1000 mm away from the inner side of the converter lining brick.

[0038] As shown in Table 1, the thermal conductivity of refractory materials λ

[0039] Table 1 Thermal conductivity of refractory materials

[0040] Material name Magnesia carbon bricks Aluminum Carbon Brick High alumina bricks Magnesia-chrome bricks Thermal conductivity W / (m·K) 1.12 1.56 1.2 1.25

[0041] Furthermore, the actual measured temperature T b Measured by sub-lance.

[0042] Furthermore, a thickness gauge is provided at the front end of the temperature measuring thermocouple 1 to measure the distance δ between the front end of the temperature measuring thermocouple 1 and the molten steel.

[0043] Furthermore, the temperature T displayed in step S4 is s The steps S2 to S3 are displayed continuously in real time.

[0044] Example 1:

[0045] The temperature measuring thermocouple 1 is arranged along the outer arc of the rear furnace body of converter 3, at a height between the trunnion of converter 3 and the center line of the furnace bottom. Four thermocouples are evenly arranged along the arc surface. The temperature measuring thermocouple 1 is installed on the thermocouple seat brick 2. The temperature measuring thermocouple 1 is connected to the temperature display to form a continuous temperature measuring device. The front end of the temperature measuring thermocouple 1 is 400mm away from the inner side of the lining brick of converter 3. The refractory material used is high-alumina brick.

[0046] The actual measured temperature T of the auxiliary gun bThe average temperature T measured by the four thermocouples is 1581℃. a The temperature is 322℃, the distance δ between the front end of the temperature measuring thermocouple 1 and the molten steel is 400mm, and the thermal conductivity λ of the refractory material used is 1.12W / (m·K). The heat flux calibration value Q is:

[0047] Q=λ(T b -T a ) / δ=1.12×(1581-322) / 0.4=3525.20

[0048] According to the heat flux calibration value Q, the distance δ between the front end of the temperature measuring thermocouple 1 and the molten steel is 400 mm, and the thermal conductivity coefficient λ of the refractory material is 1.12 W / (m·K), T k The average temperature measured by four thermocouples 1 is 293°C, and the real-time temperature of the molten steel in the converter 3 is T s It can be expressed as:

[0049] T s =(Q·δ) / λ+T k =3525.20×0.4 / 1.12+293=1552℃;

[0050] The temperature display shows that the temperature is 1552℃, and the real-time temperature of the molten steel in converter 3 is 1552℃.

[0051] Example 2

[0052] The temperature measuring thermocouple 1 is arranged along the outer arc of the rear furnace body of converter 3, at a height between the trunnion of converter 3 and the center line of the furnace bottom. Five thermocouples are evenly arranged along the arc surface. The temperature measuring thermocouple 1 is installed on the thermocouple base brick 2. The temperature measuring thermocouple 1 is connected to the temperature display to form a continuous temperature measurement device. The front end of the temperature measuring thermocouple 1 is 550mm away from the inner side of the lining brick of converter 3. The refractory material used is aluminum carbon brick.

[0053] The actual measured temperature T of the auxiliary gun b The average temperature T measured by 5 thermocouples is 1615℃. a The temperature is 335℃, the distance δ between the front end of the temperature measuring thermocouple 1 and the molten steel is 550mm, and the thermal conductivity coefficient λ of the refractory material used is 1.56W / (m·K). The heat flux calibration value Q is:

[0054] Q=λ(T b -T a ) / δ=1.56×(1615-335) / 0.55=3630.55

[0055] According to the heat flux calibration value Q, the distance δ between the front end of the temperature measuring thermocouple 1 and the molten steel is 550 mm, and the thermal conductivity of the refractory material is 1.56 W / (m·K), T kThe average temperature measured by 5 thermocouples 1 is 312℃, and the real-time temperature of molten steel in converter 3 is T s It can be expressed as:

[0056] T s =(Q·δ) / λ+T k =3630.55×0.55 / 1.56+312=1592℃;

[0057] The temperature display shows that the temperature is 1592℃, and the real-time temperature of the molten steel in converter 3 is 1592℃.

[0058] Example 3

[0059] Thermocouples 1 are arranged along the outer arc of the rear furnace body of converter 3, at a height between the trunnion and the centerline of the furnace bottom of converter 3. Six thermocouples are evenly arranged along the arc surface. Thermocouples 1 are installed on thermocouple holder bricks 2. Thermocouples 1 are connected to a temperature display to form a continuous temperature measurement device. The front end of the thermocouples 1 is 700 mm away from the inner side of the lining bricks of converter 3. The refractory material used is magnesia carbon bricks.

[0060] The actual measured temperature T of the auxiliary gun b The average temperature measured by the six thermocouples is 1594°C. a The temperature is 311℃, the distance δ between the front end of the temperature measuring thermocouple 1 and the molten steel is 700mm, and the thermal conductivity λ of the refractory material used is 1.2W / (m·K), then the heat flux calibration value Q is:

[0061] Q=λ(T b -T a ) / δ=1.2×(1594-311) / 0.7=2199.43

[0062] According to the heat flux calibration value Q, the distance δ between the front end of the temperature measuring thermocouple 1 and the molten steel is 700 mm, and the thermal conductivity of the refractory material is 1.2 W / (m·K), T k The average temperature measured by 6 thermocouples 1 is 338℃, and the real-time temperature of molten steel in converter 3 is T s Calculated as:

[0063] T s =(Q·δ) / λ+T k =2199.43×0.7 / 1.2+338=1621℃;

[0064] The temperature display shows that the temperature is 1621℃, and the real-time temperature of the molten steel in converter 3 is 1621℃.

[0065] Example 4

[0066] The temperature measuring thermocouple 1 is arranged along the outer arc of the rear furnace body of converter 3, at a height between the trunnion of converter 3 and the center line of the furnace bottom. Four thermocouples are evenly arranged along the arc surface. The temperature measuring thermocouple 1 is installed on the thermocouple base brick 2. The temperature measuring thermocouple 1 is connected to the temperature display to form a continuous temperature measurement device. The front end of the temperature measuring thermocouple 1 is 900mm away from the inner side of the lining brick of converter 3. The refractory material used is magnesia-chrome brick.

[0067] The actual measured temperature T of the auxiliary gun b The average temperature measured by the four thermocouples is 1602℃. a The temperature is 298℃, the distance δ between the front end of the temperature measuring thermocouple 1 and the molten steel is 900mm, and the thermal conductivity λ of the refractory material used is 1.25W / (m·K). The heat flux calibration value Q is:

[0068] Q=λ(T b -T a ) / δ=1.25×(1602-298) / 0.9=1811.11

[0069] According to the heat flux calibration value Q, the distance δ between the front end of the temperature measuring thermocouple 1 and the molten steel is 900 mm, and the thermal conductivity of the refractory material is 1.25 W / (m·K), T k The average temperature measured by four thermocouples 1 is 356°C, and the real-time temperature of the molten steel in the converter 3 is T s Calculated as:

[0070] T s =(Q·δ) / λ+T k =1811.11×0.9 / 1.25+356=1660℃;

[0071] That is, at this time, the instrument displays a temperature of 1660°C, and the real-time temperature of the molten steel in converter 3 is 1660°C.

[0072] It can be concluded from the above embodiments that by combining the advantages of non-contact temperature measurement and contact temperature measurement and using theoretical calculation to make up for the shortcomings of the measurement method, real-time online temperature detection of converter 3 can be achieved, providing technical reserves for realizing intelligent smelting of converter 3, improving the endpoint hit rate of converter 3, extending the service life of the continuous temperature measurement device, reducing the pressure of post-process processing, and improving product quality.

[0073] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A method for continuous temperature measurement of a converter, wherein the method performs temperature measurement by a continuous temperature measurement device, wherein the continuous temperature measurement device comprises a temperature measuring thermocouple, a thermocouple block and a temperature display, wherein: The temperature display is provided with a temperature measurement calculation program, which includes two parts: heat flux calibration and temperature measurement calibration calculation. The specific contents of the converter continuous temperature measurement method include the following: S1. Heat flux calibration: Before using the continuous temperature measuring device, the actual temperature T b The temperature T measured by the continuous temperature measuring device a The heat flux density parameters in are calibrated; the heat flux density calibration value Q is calculated by the temperature measurement calculation program, and the heat flux density calibration value Q calculation formula is: Q=λ(T b -T a ) / d; Where: δ is the distance between the front end of the temperature measuring thermocouple and the molten steel; λ is the thermal conductivity of the refractory material used; S2. Continuous temperature measurement: During the converter smelting process, the temperature measuring thermocouple continuously measures the real-time temperature T in the converter. k ; S3. Calibration calculation: According to the heat flux density calibration value Q, the real-time temperature T of the molten steel in the converter is obtained. s ; T s =(Q·δ) / λ+T k ; S4. Temperature display: The temperature T is displayed on the temperature display s .

2. A converter continuous temperature measurement method according to claim 1, characterized in that: The temperature measuring thermocouples are arranged along the outer arc of the converter rear furnace body, with a height being the center line of the converter ear axis and the furnace bottom, and 4 to 6 thermocouples are evenly arranged along the arc surface.

3. A converter continuous temperature measurement method according to claim 1 or 2, characterized in that: The temperature measuring thermocouple is installed on the thermocouple seat brick, and the front end of the temperature measuring thermocouple is 400-1000mm away from the inner side of the converter lining brick.

4. The method for continuous temperature measurement of a converter according to claim 1, characterized in that: The thermal conductivity coefficient λ of the refractory material is: magnesia carbon brick: λ=1.12; alumina carbon brick: λ=1.56; high alumina brick: λ=1.2; magnesia chrome brick: λ=1.

25.

5. The method for continuous temperature measurement of a converter according to claim 1, characterized in that: The actual measured temperature T b Measured by sub-lance.

6. The method for continuous temperature measurement of a converter according to claim 1, characterized in that: A thickness gauge is provided at the front end of the temperature measuring thermocouple to measure the distance δ between the front end of the temperature measuring thermocouple and the molten steel.

7. The method for continuous temperature measurement of a converter according to claim 1, characterized in that: The temperature T displayed in step S4 s The steps S2 to S3 are displayed continuously in real time.

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