A rapid evaluation method for the life of iron channel

Abstract

The present invention discloses a method for quickly evaluating the life of an iron groove, which belongs to the technical field of blast furnace ironmaking. The method introduces an iron groove service time factor, an iron groove iron amount factor, and an iron groove refractory erosion factor, and statistics the cumulative iron tapping time, the cumulative iron flow amount, and the erosion amount. The upper limits of the factors are determined according to actual production needs, and a ratio evaluation is performed. The evaluation method of the present patent takes into account the service time of the iron groove, the cumulative iron flow amount, and the erosion of the iron groove refractory. The method can evaluate the life of the iron groove more quickly and scientifically. The blast furnace operator only needs to check the evaluation results at any time to determine whether the iron groove needs to be repaired.

Description

Technical Field

[0001] The invention belongs to the technical field of blast furnace ironmaking and relates to a method for quickly evaluating the life of an iron channel. Background Art

[0002] In the modern blast furnace ironmaking process, as the smelting process continues, liquid iron and liquid slag must be discharged from the furnace through the iron hole in a timely manner. In the process of slag iron discharge, the liquid high-temperature slag iron will inevitably scour and erode the iron ditch. The iron ditch will experience multiple scouring and erosion during an overhaul service cycle, resulting in a continuous reduction in the life of the iron ditch.

[0003] At present, the life of the blast furnace iron runner is mainly determined by the service time. However, in actual production, due to the iron-discharging organization or other unexpected factors, there may be an accident in which the service time of a certain iron mouth is not reached and the side or bottom of the iron runner is burned through. The blast furnace is forced to slow wind treatment or emergency wind stop, which not only disrupts the normal smelting rhythm in the furnace, but also brings great safety hazards to production. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a method for quickly evaluating the life of an iron groove in view of the deficiencies of the above-mentioned prior art. The method for quickly evaluating the life of an iron groove is to solve the above-mentioned technical problem. The present invention provides the following technical solution: A method for quickly evaluating the life of an iron groove, comprising the following steps:

[0005] Step 1: Introduce the service time factor a of the iron ditch, the iron flow factor b of the iron ditch, and the corrosion resistance factor c of the iron ditch, where a=T / T0, b=M / M0, c=L / L0, T0 is the maximum service time allowed for the iron ditch, M0 is the maximum iron flow allowed for the iron ditch, and L0 is the initial thickness of the iron ditch; and set the upper limit of the service time factor a respectively max , Upper limit of iron flux factor b max , the upper limit of the corrosion factor of the iron channel resistant material c max ;

[0006] Step 2: (1) Each time the tapping starts, the tapping hole is opened. The tapping hole refers to the hole through which the blast furnace taps iron. The opening time t is recorded. i1 , each time the tapping is completed and the tapping hole is closed, the plugging time t is recorded i2 , the cumulative iron-out time T of the iron ditch is calculated by the following formula:

[0007]

[0008] Record the amount of iron produced from the i-th furnace m i , the cumulative amount of iron flowing through the iron channel M is calculated by the following formula:

[0009]

[0010] Where i represents the number of tapping furnaces, N represents the number of tapping furnaces at the tap hole, the unit of T is h, and the unit of M is t;

[0011] (2) Regularly use a 3D laser scanner to measure the morphology of the iron channel refractory material and calculate the erosion amount L of the most severely eroded part i ; Count the difference L between two consecutive measurements, L unit is mm,

[0012]

[0013] Step 3: When each tapping is completed and the 3D laser scanner measurement is completed, if a≥a max , b≥b max or C ≥ c max , then stop using the iron ditch.

[0014] Preferably, N represents the number of tapping furnaces at the iron mouth, and the number of times is counted starting from the casting or overhaul of the iron trough. The number of times can be counted after the first use; or the number of times can be counted after the overhaul is completed to meet different needs.

[0015] Preferably, the model of the three-dimensional laser scanner is FaroS350plus.

[0016] Preferably, the maximum amount of iron passing through the iron groove M0 is obtained by calculating the average value of the amount of iron passing through during multiple service cycles; the longest service time T0 allowed by the iron groove is obtained by calculating the average value of the service time during multiple service cycles.

[0017] Preferably, the data statistical calculation and determination in steps one to three are based on computer control.

[0018] Beneficial effect: The method provided by the present invention takes into account the service life of the iron groove, the cumulative amount of iron flowing through, and the erosion of the refractory material of the iron groove. This method can evaluate the life of the iron groove more quickly and scientifically. The blast furnace operator only needs to check the evaluation results at any time to determine whether the iron groove needs to be repaired; and it can be automatically counted by computer without manual calculation or intervention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the iron ditch before erosion;

[0020] Figure 2 Schematic diagram of the iron ditch after erosion. DETAILED DESCRIPTION

[0021] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific preferred embodiments.

[0022] In the description of the present invention, it should be understood that the terms "left side", "right side", "upper part", "lower part" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which 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. "First", "second" and the like do not indicate the importance of the components, and therefore cannot be understood as limiting the present invention. The specific dimensions used in this embodiment are only for illustrating the technical solution, and do not limit the scope of protection of the present invention.

[0023] Embodiment 1:

[0024] refer to Figure 1-2 The present invention provides a technical solution, a method for quickly evaluating the life of an iron channel, comprising the following steps:

[0025] Step 1: Introduce the service time factor a of the iron ditch, the iron flow factor b of the iron ditch, and the corrosion resistance factor c of the iron ditch, where a=T / T0, b=M / M0, c=L / L0, T0 is the maximum service time allowed for the iron ditch, M0 is the maximum iron flow allowed for the iron ditch, and L0 is the initial thickness of the iron ditch;

[0026] And set the upper limit of service time factor a respectively max , Upper limit of iron flux factor b max , the upper limit of the corrosion factor of the iron channel resistant material c max The upper limit of the factor can be flexibly determined based on the specific conditions of actual production requirements for production organization, upstream and downstream equipment maintenance matching, safe production and environmental protection.

[0027] Step 2: (1) Each time the tapping starts, the tapping time t is recorded. i1 , each time the tapping is completed and the tapping hole is closed, the plugging time t is recorded i2 , the cumulative iron-out time T of the iron ditch is calculated by the following formula:

[0028]

[0029] Record the amount of iron produced from the i-th furnace m i , the cumulative amount of iron flowing through the iron channel M is calculated by the following formula:

[0030]

[0031] Where i represents the number of tapping furnaces, N represents the number of tapping furnaces at the tap hole, the unit of T is h, and the unit of M is t;

[0032] (2) Regularly use a 3D laser scanner to measure the morphology of the iron channel refractory material and calculate the erosion amount L of the most severely eroded part i; Count the difference L between two consecutive measurements, L unit is mm,

[0033]

[0034] Step 3: When each tapping is completed and the 3D laser scanner measurement is completed, if a≥a max , b≥b max or C ≥ c max , then stop using the iron ditch.

[0035] Furthermore, N represents the number of tapping furnaces at the taphole, and the number of times is counted starting from the time when the iron trough is poured or overhauled.

[0036] Furthermore, the model of the 3D laser scanner is FaroS350plus.

[0037] Furthermore, the maximum amount of iron passing through the iron groove M0 is obtained by calculating the average value of the amount of iron passing through during multiple service cycles; the maximum service time T0 is obtained by calculating the average value of the service time during multiple service cycles.

[0038] Furthermore, the data statistical calculation and determination in steps one to three are based on computer control.

[0039] Embodiment 2:

[0040] refer to Figure 1-2 , on the basis of Example 1, step 1: introducing the iron ditch service time factor a, the iron ditch iron volume factor b, and the iron ditch erosion resistance factor c, wherein a=T / T0, b=M / M0, c=L / L0, T0 is the maximum service time allowed for the iron ditch, M0 is the maximum iron volume allowed for the iron ditch, and L0 is the initial thickness of the iron ditch;

[0041] The maximum service time T0 allowed by the iron ditch is mainly determined based on the statistical values ​​of the service time of the blast furnace iron ditch. The average value is used as the maximum service time for safe operation. The service time within 20 service cycles is statistically shown in Table 1 below. The average value is calculated to be 900h, so the maximum service time T0 allowed by the iron ditch is set to 900h;

[0042] Table 1 Service time within 20 service cycles

[0043] Service life Service time / h Service life Service time / h Service life Service time / h 1 905 8 910 15 890 2 910 9 917 16 896 3 892 10 909 17 904 4 890 11 897 18 901 5 895 12 908 19 893 6 893 13 901 20 902 7 906 14 881

[0044] M0 is the maximum allowable iron flux of the iron channel. It is mainly determined based on the statistical value of the iron flux of a certain iron channel in a certain blast furnace during its service time. Its average value is used as the maximum allowable iron flux for safe operation. The iron flux within 20 service cycles is shown in Table 2 below. The average value is calculated to be 300,000 tons, so the maximum allowable iron flux M0 of the iron channel is set to 300,000 tons.

[0045] Table 2 Iron flow in 20 service cycles

[0046] Service life Iron throughput / t Service life Service time Service life Iron throughput / t 1 295000 8 294600 15 310900 2 301000 9 308000 16 296500 3 286000 10 294200 17 298000 4 313500 11 298600 18 300600 5 298500 12 304100 19 297400 6 309000 13 293100 20 296500 7 312000 14 292500

[0047] The initial thickness of the iron ditch is 300 mm, and the initial thickness L0 of the iron ditch is 300 mm;

[0048] And set the upper limit of service time factor a respectively max is 1.05, the upper limit of the iron flux factor b max The upper limit of the erosion factor of the iron channel resistant material is 1.10. max is 0.65;

[0049] Step 2: Start to collect the experimental statistical data of the actual production example 1.

[0050] (1) Each time the tapping starts, the tapping time t is recorded. i1 , each time the tapping is completed and the tapping hole is closed, the plugging time t is recorded i2 , the cumulative iron-out time T of the iron ditch is calculated by the following formula:

[0051]

[0052] Record the amount of iron produced from the i-th furnace m i , the cumulative amount of iron flowing through the iron channel M is calculated by the following formula:

[0053]

[0054] Where i represents the number of tapping furnaces, N represents the number of tapping furnaces at the tap hole, the unit of T is h, and the unit of M is t;

[0055] (2) Regularly use the 3D laser scanner FaroS350plus to measure the morphology of the iron channel refractory material and calculate the erosion amount L of the most severely eroded part i ; Count the difference L between two consecutive measurements, L unit is mm,

[0056]

[0057] The data collected in step 2 is divided into 10 fixed time periods for statistics. The results are shown in the following table:

[0058] Table 3 Statistics of each time period of actual production example 1

[0059] Time period Actual service time / h Iron content in iron channel / t Iron channel resistant material erosion amount / mm Fixed time period 1 93 27000 5 Fixed time period 2 94 27100 8 Fixed time period 3 98 28000 10 Fixed time period 4 100 28200 13 Fixed time period 5 91 27300 15 Fixed time period 6 95 27200 15 Fixed time period 7 99 27300 17 Fixed time period 8 93 27200 20 Fixed time period 9 94 27400 22 Fixed time period 10 93 27300 25 total 950 274000 150

[0060] Step 3: According to the table data, the ratio of the final value of the total of 10 fixed time periods to T0, M0, and L0 is a=1.056>a max, b=0.913<b max 、C=0.500<c max , since the service time factor a of the iron channel is greater than the upper limit a of the service time factor max If it is judged to be unsafe, stop using the ditch and carry out repairs.

[0061] Embodiment 3:

[0062] refer to Figure 1-2 Based on step 1 of Example 2, step 2 is performed: start to collect experimental statistical data of actual production example 2, and collect statistical data according to the method of step 2.

[0063] The data collected in step 2 is divided into 10 fixed time periods for statistics. The results are shown in the following table:

[0064] Table 4 Statistics of each time period of actual production example 1

[0065] Time period Actual service time / h Iron content in iron channel / t Iron channel resistant material erosion amount / mm Fixed time period 1 91 26000 8 Fixed time period 2 92 27100 12 Fixed time period 3 90 26500 14 Fixed time period 4 97 26800 15 Fixed time period 5 91 26300 21 Fixed time period 6 94 27200 20 Fixed time period 7 95 27000 22 Fixed time period 8 93 27200 24 Fixed time period 9 88 26400 29 Fixed time period 10 89 26500 35 total 920 267000 200

[0066] Step 3: According to the table data, the ratio of the final value of the total of 10 fixed time periods to T0, M0, and L0 is a=1.022<a max , b=0.890<b max 、C=0.667>c max , since the service time factor a of the iron channel is greater than the upper limit a of the service time factor max If it is judged to be unsafe, stop using the ditch and carry out repairs.

[0067] Embodiment 4:

[0068] refer to Figure 1-2 Based on step 1 of Example 2, step 2 is performed: start to collect experimental statistical data of actual production example 3, and collect statistical data according to the method of step 2.

[0069] The data collected in step 2 is divided into 10 fixed time periods for statistics. The results are shown in the following table:

[0070] Table 5 Statistics of each time period of actual production example 3

[0071] Time period Actual service time / h Iron content in iron channel / t Iron channel resistant material erosion amount / mm Fixed time period 1 95 33500 8 Fixed time period 2 92 32900 10 Fixed time period 3 98 35200 10 Fixed time period 4 99 35600 15 Fixed time period 5 91 31600 16 Fixed time period 6 95 34800 15 Fixed time period 7 95 32800 21 Fixed time period 8 91 33500 26 Fixed time period 9 89 31500 29 Fixed time period 10 95 33600 30 total 940 335000 180

[0072] Step 3: According to the table data, the ratio of the final value of the total of 10 fixed time periods to T0, M0, and L0 is a=1.044<a max , b=1.117>b max 、C=0.600<c max , since the iron content b of the iron channel is greater than the upper limit b of the iron content b of the iron channel maxIf it is judged to be unsafe, stop using the ditch and carry out repairs.

[0073] Embodiment 5:

[0074] refer to Figure 1-2 Based on step 1 of Example 2, step 2 is performed: start to collect the experimental statistical data of actual production example 4, and collect the statistical data according to the method of step 2.

[0075] The data collected in step 2 is divided into 10 fixed time periods for statistics. The results are shown in the following table:

[0076] Table 6 Statistics of actual production example 4 in each time period

[0077] Time period Actual service time / h Iron content in iron channel / t Iron channel resistant material erosion amount / mm Fixed time period 1 90 28500 6 Fixed time period 2 99 30400 9 Fixed time period 3 94 29500 10 Fixed time period 4 93 29600 15 Fixed time period 5 91 28600 16 Fixed time period 6 95 29900 15 Fixed time period 7 89 27900 18 Fixed time period 8 94 28700 20 Fixed time period 9 92 28400 22 Fixed time period 10 93 28500 29 total 930 290000 160

[0078] Step 3: According to the table data, the ratio of the final value of the total of 10 fixed time periods to T0, M0, and L0 is a=1.033<a max , b=0.967<b max 、C=0.533<c max , because they are all less than the upper limit of the factor, they are judged to be safe after 930 hours of operation and can continue to be used. However, the values ​​are already close to the upper limit, so it is necessary to strengthen monitoring during subsequent use.

[0079] Although the content of the present invention has been described in detail through the above preferred embodiments, it should be appreciated that the above description should not be considered as a limitation of the present invention. After reading the above content, it will be obvious to those skilled in the art for various modifications and substitutions of the present invention. Within the scope of the technical concept of the present invention, various equivalent transformations can be performed on the technical solution of the present invention, and these equivalent transformations all belong to the protection scope of the present invention.

Claims

1. A method for quickly evaluating the life of an iron channel, characterized in that: The steps include: Step 1: Introduce the service time factor a of the iron ditch, the iron flow factor b of the iron ditch, and the erosion resistance factor c of the iron ditch, where a=T / T0, b=M / M0, c=L / L0, T0 is the maximum service time allowed for the iron ditch, which is obtained by calculating the average value of the service time of multiple service cycles; M0 is the maximum iron flow allowed for the iron ditch, which is obtained by calculating the average value of the iron flow in multiple service cycles; L0 is the initial thickness of the iron ditch; and set the upper limit of the service time factor a respectively max is 1.05, the upper limit of the iron flux factor b max The upper limit of the erosion factor of the iron channel resistant material is 1.

10. max is 0.65; Step 2: (1) Each time the tapping starts, the tapping time t is recorded. i1 , each time the tapping is completed and the tapping hole is closed, the plugging time t is recorded i2 , the cumulative iron-out time T of the iron ditch is calculated by the following formula: Record the amount of iron produced from the i-th furnace m i , the cumulative amount of iron flowing through the iron channel M is calculated by the following formula: Where i represents the number of tapping furnaces, N represents the number of tapping furnaces at the tap hole, and the number of times is calculated from the time the iron trough is poured or repaired. The unit of T is h, and the unit of M is t; (2) Regularly use a 3D laser scanner to measure the morphology of the iron channel refractory material and calculate the erosion amount L of the most severely eroded part i ; Count the difference L between two consecutive measurements, L unit is mm, Step 3: When each tapping is completed and the 3D laser scanner measurement is completed, if a≥a max , b≥b max or C ≥ c max , then stop using the iron ditch.

2. The method for quickly evaluating the life of an iron channel according to claim 1, characterized in that: The model of the three-dimensional laser scanner is FaroS350plus.

3. The method for quickly evaluating the life of an iron channel according to claim 1, characterized in that: The data statistical calculation and determination in steps 1 to 3 are based on computer control.

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