Method for measuring temperature of molten iron in torpedo ladle

Abstract

The present application relates to a kind of torpedo tank molten iron temperature measuring method, belong to the temperature measurement technology field using thermoelectric element.The method first defines two time intervals and;Then obtain historical N torpedo tank molten iron temperature value, obtain temperature range and M-1 calculation temperature value in temperature range;Then every value in calculation temperature value is selected at least three historical torpedo tank molten iron temperature value in positive and negative P range and is averaged to obtain M-1 average temperature value, and the average value of the t1 value corresponding to the historical torpedo tank molten iron temperature value selected is obtained, obtains M-1 average time interval;Then make to increase a time unit in turn until stop to meet the condition, solve, and solve the falling speed v;Finally control temperature measuring gun to descend with speed v and continue to descend time after starting temperature measuring signal appears stop, until temperature measuring ends.The method compared with the empirical value control of traditional method can ensure that the depth of temperature measuring probe falls in the specified depth range.

Description

Technical Field

[0001] This invention relates to a method for measuring the temperature of molten iron inside a torpedo ladle, belonging to the technical field of temperature measurement using thermoelectric elements (G01K7 / 02). Background Technology

[0002] During the transfer of molten iron from the ironworks to the steelworks, the molten iron is typically placed into different torpedo ladles, where its temperature and composition are measured. Based on the measured data, the different torpedo ladles are rationally allocated to the corresponding ladle-turning stations, where the molten iron is finally poured into iron ladles.

[0003] Currently, the traditional method for temperature measurement involves controlling the descent of a temperature probe into the molten iron in the ladle. When the start-of-measurement signal appears, the descent time and speed of the probe are controlled empirically to ensure the probe reaches the depth specified by industry standards. However, the start-of-measurement signal only appears after the protective layer of the probe has melted in the molten iron. Therefore, the traditional method ignores the depth the probe has already descended into the molten iron before the start-of-measurement signal appears. Furthermore, the melting rate of the protective layer varies depending on the temperature of the molten iron, often resulting in the probe being outside the specified depth range, thus affecting the accuracy of the measurement results. Summary of the Invention

[0004] The technical problem to be solved by this invention is: how to ensure that the temperature measuring probe of the temperature measuring gun descends to a specified depth range within the molten iron in the torpedo ladle for temperature measurement.

[0005] The technical solution proposed by this invention to solve the above-mentioned technical problems is: a method for measuring the temperature of molten iron in a torpedo ladle, comprising the following steps:

[0006] Step 1: Record the first time interval from when the temperature probe of the temperature gun contacts the molten iron in the torpedo ladle to when the temperature measurement signal appears as _____. The second time interval from when the temperature measuring gun starts descending after the start of the temperature measuring signal until it stops is denoted as... , a torpedo can and The sum of these values ​​represents the measurement time for determining the temperature of molten iron inside a torpedo ladle.

[0007] Step 2: Obtain the historical N temperatures of molten iron in torpedo ladles. Find the minimum temperature a and the maximum temperature b from the N temperature values. Use the minimum temperature a and the maximum temperature b to form the temperature range (a, b). Divide the temperature difference x equally by the difference between the minimum temperature a and the maximum temperature b, which is divisible by a natural number M. Then the temperature range (a, b) is divided into M intervals, where M is a natural number greater than 1 and N is a natural number greater than 100.

[0008] Within the temperature range (a, b), select the temperature values ​​for each additional equal temperature difference x from the minimum temperature a to the maximum temperature b, and record them as M-1 calculated temperature values.

[0009] Obtain N historical temperature measurement times for N historical torpedo ladle molten iron temperature values;

[0010] For each of the calculated temperature values, select at least three historical molten iron temperatures in the torpedo ladle within the range of positive and negative P, and calculate the average value to obtain M-1 average temperature values, denoted as T1 to T2. M-1 P < x / 2;

[0011] Then, the average value of t1 corresponding to the molten iron temperature values ​​in at least three historical torpedo ladles is calculated to obtain M-1 average time intervals, denoted as . ;

[0012] Step 3: Let t2 start from 0 and increment by one time unit at a time until... Stop at time, the aforementioned and These are the specified maximum and minimum depths to which the temperature probe descends into the molten iron;

[0013] Substitute the t2 value at the point of cessation into the following formula (1) to calculate the descent speed of the temperature measuring gun.

[0014] (1);

[0015] Step 4: Control the temperature gun at a certain speed The temperature probe descends into the molten iron in the torpedo ladle and issues a start temperature measurement signal. Then, the temperature gun continues to descend for time t2 before stopping. Once the end temperature measurement signal appears, the reading on the temperature gun is the temperature of the molten iron in the torpedo ladle.

[0016] Furthermore, after step 4, step 5 is performed: the temperature of the molten iron measured in step 4 is recorded as... ;

[0017] If T1≤ ≤T M-1 The first time interval from when the temperature probe of the temperature measuring gun contacts the molten iron in the torpedo ladle to when the temperature measurement signal appears is calculated according to the following formula (2).

[0018] (2);

[0019] In equation (2), Is with The average time interval corresponding to the smallest of the two closest average temperature values; Is with The average time interval corresponding to the larger of the two closest average temperature values; Is with The smallest of the two closest average temperature values; Is with The larger of the two closest average temperature values;

[0020] like <T1, ;

[0021] like >T M-1 , ;

[0022] The depth H of the temperature probe of the temperature measuring gun descending into the molten iron in the torpedo ladle is calculated using the following formula (3).

[0023] (3).

[0024] Furthermore, one of the time units in step 3 is 1 second.

[0025] The beneficial effect of this invention is that the different temperatures of molten iron inside the torpedo ladle will lead to variations in the temperature measurement process. Different, therefore, adopt Gradually increase the time unit until a specific set condition is met, then stop and output the result. The descent speed of the temperature probe is precisely calculated using a specific formula. This precise calculation effectively reduces the time it takes for the probe to descend to the specified depth compared to traditional methods, preventing prolonged exposure to the high temperatures of molten iron. Crucially, this precise control of descent speed and depth ensures that the probe is inserted into the molten iron to within the industry-specified depth range after the temperature measurement signal is received, thus improving the accuracy of temperature measurement inside the torpedo ladle. Detailed Implementation

[0026] Example

[0027] The method for measuring the temperature of molten iron inside the torpedo ladle in this embodiment includes the following steps:

[0028] Step 1: Record the first time interval from when the temperature probe of the temperature gun contacts the molten iron in the torpedo ladle to when the temperature measurement signal appears as _____. The second time interval from when the temperature measuring gun starts descending after the start of the temperature measuring signal until it stops is denoted as... , a torpedo can and The sum of these values ​​represents the measurement time for determining the temperature of molten iron inside a torpedo ladle.

[0029] Step 2: Obtain the historical N temperatures of molten iron in torpedo ladles. Find the minimum temperature a and the maximum temperature b from the N temperature values. Use the minimum temperature a and the maximum temperature b to form the temperature range (a, b). Divide the temperature difference x equally by the difference between the minimum temperature a and the maximum temperature b, which is divisible by a natural number M. Then the temperature range (a, b) is divided into M intervals, where M is a natural number greater than 1 and N is a natural number greater than 100.

[0030] In this embodiment, the temperature values ​​of molten iron in 200 historical torpedo ladles are obtained, forming a temperature range of (1200~1500), and the temperature difference is divided into 50°C equal intervals. The temperature range is divided into 6 intervals.

[0031] Within the temperature range (a, b), select the temperature values ​​for each additional equal temperature difference x from the minimum temperature a to the maximum temperature b, and record them as M-1 calculated temperature values.

[0032] This embodiment yielded a total of 5 calculated temperature values;

[0033] Obtain N historical temperature measurement times for N historical torpedo ladle molten iron temperature values;

[0034] For each calculated temperature value, select at least three historical molten iron temperatures in the torpedo ladle within the range of positive and negative P, and calculate the average value to obtain M-1 average temperature values, denoted as T1 to T2. M-1 P < x / 2;

[0035] In this embodiment, P is set to 10℃, and the five average temperature values ​​T1 to T5 are 1256.3℃, 1308℃, 1351.3℃, 1401.3℃ and 1446.6℃, respectively.

[0036] Then, the average value of t1 corresponding to the molten iron temperature values ​​in at least three historical torpedo ladles is calculated to obtain M-1 average time intervals, denoted as . ;

[0037] In this embodiment, the five average time intervals obtained The times were 3s, 2.8s, 2.6s, 2.4s, and 2.3s, respectively.

[0038] Step 3: Let t2 start from 0 and increment by one time unit at a time until... Stop at time and These are the specified maximum and minimum depths to which the temperature probe descends into the molten iron;

[0039] Substitute the t2 value at the point of cessation into the following formula (1) to calculate the descent speed of the temperature measuring gun.

[0040] (1);

[0041] In this embodiment, t2 is incremented by 1 second starting from 0. When t2=1, the condition is met and the process stops. Therefore, t2 is set to 1 second. The velocity is obtained according to equation (1). =67.35mm / s.

[0042] Step 4: Control the temperature gun at a certain speed The temperature probe descends at a speed of 67.35 mm / s. Once it enters the molten iron in the torpedo ladle and issues a start temperature measurement signal, the temperature gun continues to descend for t2 = 1 second before stopping. After the end temperature measurement signal appears, the reading on the temperature gun is the temperature of the molten iron in the torpedo ladle.

[0043] The temperature of the molten iron inside the torpedo ladle was measured to be 1400℃ in this embodiment.

[0044] After step 4, proceed to step 5: Record the temperature of the molten iron measured in step 4 as... ;

[0045] If T1≤ ≤T M-1 The first time interval from when the temperature probe of the temperature measuring gun contacts the molten iron in the torpedo ladle to when the temperature measurement signal appears is calculated according to the following formula (2).

[0046] (2);

[0047] In equation (2), Is with The average time interval corresponding to the smallest of the two closest average temperature values; Is with The average time interval corresponding to the larger of the two closest average temperature values; Is with The smallest of the two closest average temperature values; Is with The larger of the two closest average temperature values;

[0048] like <T1, ;

[0049] like >T M-1 , ;

[0050] The depth H of the temperature probe of the temperature measuring gun descending into the molten iron in the torpedo ladle is calculated using the following formula (3).

[0051] (3);

[0052] Since 1256.3℃ < 1400℃ < 1446.6℃, and the two average temperature values ​​closest to 1400℃ are T3 = 1351.3℃ and T4 = 1401.3℃, the average time intervals corresponding to T3 and T4 are respectively... =2.6s and =2.4s, therefore, according to equation (2), the result is obtained. And according to formula (3), the temperature probe of the temperature measuring gun descends to the depth H=228mm of the molten iron in the torpedo pot.

[0053] The above description is only a preferred embodiment of the present invention, but the present invention is not limited thereto. All equivalent substitutions or modifications made to the concepts and technical solutions of the present invention should be covered within the protection scope of the present invention.

Claims

1. A method for measuring the temperature of molten iron inside a torpedo ladle, characterized in that... Includes the following steps: Step 1: Record the first time interval from when the temperature probe of the temperature gun contacts the molten iron in the torpedo ladle to when the temperature measurement signal appears as _____. The second time interval from when the temperature measuring gun starts descending after the start of the temperature measuring signal until it stops is denoted as... , a torpedo can and The sum of these values ​​represents the measurement time for determining the temperature of molten iron inside a torpedo ladle. Step 2: Obtain the historical N temperatures of molten iron in torpedo ladles. Find the minimum temperature a and the maximum temperature b from the N temperature values. Use the minimum temperature a and the maximum temperature b to form the temperature range (a, b). Divide the temperature difference x equally by the difference between the minimum temperature a and the maximum temperature b, which is divisible by a natural number M. Then the temperature range (a, b) is divided into M intervals, where M is a natural number greater than 1 and N is a natural number greater than 100. Within the temperature range (a, b), select the temperature values ​​for each additional equal temperature difference x from the minimum temperature a to the maximum temperature b, and record them as M-1 calculated temperature values. Obtain N historical temperature measurement times for N historical torpedo ladle molten iron temperature values; For each of the calculated temperature values, select at least three historical molten iron temperatures in the torpedo ladle within the range of positive and negative P, and calculate the average value to obtain M-1 average temperature values, denoted as T1 to T2. M-1 P < x / 2; Then, the average value of t1 corresponding to the molten iron temperature values ​​in at least three historical torpedo ladles is calculated to obtain M-1 average time intervals, denoted as . ; Step 3: Let t2 start from 0 and increment by one time unit at a time until... Stop at time, the aforementioned and These are the specified maximum and minimum depths to which the temperature probe descends into the molten iron; Substitute the t2 value at the point of cessation into the following formula (1) to calculate the descent speed of the temperature measuring gun. （1）； Step 4: Control the temperature gun at a certain speed The temperature probe descends into the molten iron in the torpedo ladle and issues a start temperature measurement signal. Then, the temperature gun continues to descend for time t2 before stopping. Once the end temperature measurement signal appears, the reading on the temperature gun is the temperature of the molten iron in the torpedo ladle.

2. The method for measuring the temperature of molten iron in a torpedo ladle according to claim 1, characterized in that: Step 5 is performed after step 4: Record the molten iron temperature measured in step 4 as ; If T1≤ ≤T M-1 The first time interval from when the temperature probe of the temperature measuring gun contacts the molten iron in the torpedo ladle to when the temperature measurement signal appears is calculated according to the following formula (2). （2）； In equation (2), Is with The average time interval corresponding to the smallest of the two closest average temperature values; Is with The average time interval corresponding to the larger of the two closest average temperature values; Is with The smallest of the two closest average temperature values; Is with The larger of the two closest average temperature values; like <T1, ; like >T M-1 , ; The depth H of the temperature probe of the temperature measuring gun descending into the molten iron in the torpedo ladle is calculated using the following formula (3). （3）。 3. The method for measuring the temperature of molten iron in a torpedo ladle according to claim 1, characterized in that: One of the time units in step 3 is 1 second.

Images