Method for accurately predicting lance position of oxygen lance of converter

Abstract

The invention discloses a method for accurately predicting the lance position of a converter oxygen lance, and belongs to the technical field of ferrous metallurgy. The lance position of the oxygen lance in the converter smelting process is calculated through the following formula: # imgabs0 #; wherein # imgabs 1 # is the height of the oxygen lance under the standard condition; # imgabs2 is an actual oxygen flow rate; # imgabs3 is the oxygen flow under the standard condition; # imgabs4 # is a bottom blowing influence factor; and # imgabs5 is the height of the bottom blowing influence gun position. The method can accurately predict the lance position change of the oxygen lance in the converter smelting process.

Description

Technical Field

[0001] The invention belongs to the technical field of iron and steel metallurgy, and particularly relates to a method for accurately predicting the position of a converter oxygen lance. Background Art

[0002] Oxygen lance position is a critical parameter in the converter smelting process. It directly affects the impact depth and area of the oxygen jet, thereby influencing the reaction rate and uniformity within the molten pool. In actual production, oxygen lance position needs to be adjusted dynamically based on changes in furnace floor height, molten pool depth, and smelting stage. Lance position that is too high or too low can lead to instability during the smelting process, such as splashing, poor slagging, or lance burnout. Therefore, accurate measurement of oxygen lance position can optimize oxygen supply and smelting time, reducing oxygen consumption and production costs. Traditional processes use devices such as wire and auxiliary lances to measure actual lance position, which is time-consuming, costly, and poorly accurate. Therefore, accurately measuring converter oxygen lance position to optimize the smelting process, improve molten steel quality, production efficiency, and economic benefits, while ensuring production safety is a common technical challenge faced by every steelmaking plant.

[0003] Patent application number CN202421120699.0 provides a tool for detecting the molten steel level. By measuring the upper portion of the steel level trace on the oxygen lance and comparing it with the relative height of the oxygen lance outer tube, the tool accurately determines the molten steel level. This verifies the accuracy of the data value from the encoder on the oxygen lance outer tube and adjusts the actual height of the oxygen lance outer tube based on the error, thereby resolving the issue of inaccurate lance positioning. While this method uses physical equipment for measurement, it offers a slight improvement over traditional measurement methods, but still suffers from the drawbacks of being difficult and time-consuming.

[0004] Patent application number CN202410539078.4 proposes a method for calibrating oxygen lance position. This method calculates and predicts oxygen lance position based on parameters such as the baseline furnace bottom thickness, the actual molten steel level, and changes in furnace bottom thickness. This method uses calculations to predict lance position, effectively avoiding the drawbacks of physical equipment measurement. However, the numerous parameters involved affect the accuracy of the prediction. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a method for accurately predicting the position of the oxygen lance of a converter, with a deviation within ±5 cm.

[0006] In order to solve the above technical problems, the technical solutions of the present invention are as follows: A method for accurately predicting the position of the converter oxygen lance is obtained by calculating the oxygen flow rate and the influence of the converter bottom blowing through a formula; the formula is:

[0007] In the formula: The oxygen lance position during converter smelting, unit: cm; The oxygen lance height under standard conditions, in cm; is the actual oxygen flow rate, unit is m 3 / min; It is the oxygen flow rate under standard conditions, in m 3 / min; It is the factor affecting the bottom blowing of the converter. The value is 0.1 in the early stage of the campaign and 0.15 in the later stage of the campaign.

[0008] Because the bottom blowing of the converter affects the gun height, the value is -3cm in the early stage of the furnace service; and -5cm in the later stage of the furnace service.

[0009] The early stage of furnace service mentioned in the present invention refers to a furnace age of ≤5000 furnaces; and the late stage of furnace service refers to a furnace age of >5000 furnaces.

[0010] Furthermore, the method of the present invention is applicable to ;in, is the minimum oxygen flow rate, in m 3 / min; is the maximum oxygen flow rate, in m 3 / min; the maximum oxygen flow rate and minimum oxygen flow rate are the values under normal process conditions.

[0011] Furthermore, the oxygen lance height and oxygen flow rate under the standard conditions described in the present invention are based on parameters such as the nominal capacity of the converter, the furnace capacity ratio, the thickness of the lining of the new furnace, and are determined based on a combination of industry experience data, theoretical calculations and practical applications, and are relatively fixed parameters.

[0012] The beneficial effects of adopting the above technical solution are:

[0013] The method of the present invention can accurately predict the change in the lance position of the oxygen lance during the converter smelting process, with the error between the predicted value and the actual value within ±5%. It can be applied in the steelmaking process on a large scale, is easy to operate, and produces stable results.

[0014] The method of the present invention can effectively predict the oxygen lance position height during converter smelting, reduce many disadvantages caused by changes in the oxygen lance position during steelmaking, effectively improve steelmaking capacity, and enhance product quality. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0016] In each embodiment, the calculation method of the oxygen lance position during the converter smelting process is:

[0017] in: The oxygen lance position during converter smelting, unit: cm; The oxygen lance height under standard conditions, in cm; is the actual oxygen flow rate, unit is m 3 / min; It is the oxygen flow rate under standard conditions, in m 3 / min; It is the factor affecting the bottom blowing of the converter. The value is 0.1 in the early stage of the campaign and 0.15 in the later stage of the campaign.

[0018] Because the bottom blowing of the converter affects the lance height, the value in the early stage of the furnace campaign is -3cm; the value in the late stage of the furnace campaign is -5cm; the early stage of the furnace campaign refers to furnace age ≤ 5000 furnaces; the late stage of the furnace campaign refers to furnace age > 5000 furnaces.

[0019] Example 1

[0020] A steel converter in a steel plant has a furnace age of 5000. In the early stage of furnace service, the factors affecting bottom blowing are: 0.1, bottom blowing affects the gun height -3cm. Under standard conditions, the oxygen gun height 100cm, oxygen flow rate 480m 3 / min.

[0021] During the smelting process, the actual oxygen flow 490m 3 / min.

[0022] Substituting the above parameters into the formula, the position of the oxygen lance under the above process conditions can be calculated. It is 100.74cm.

[0023] The actual gun position of the oxygen gun was manually measured and the result was 100.5 cm.

[0024] The predicted result deviates from the actual measurement result by 0.24 cm, with an error of 0.24%. This shows that the prediction model has high accuracy and can truly reflect the actual gun position.

[0025] Example 2 A steel converter in a steel plant has a furnace age of 3000. In the early stage of furnace service, the factors affecting bottom blowing are: 0.1, bottom blowing affects the gun height -3cm. Under standard conditions, the oxygen gun height 100cm, oxygen flow rate 480m 3 / min.

[0026] During the smelting process, the actual oxygen flow 500m 3 / min.

[0027] Substituting the above parameters into the formula, the position of the oxygen lance under the above process conditions can be calculated. It is 101.76cm.

[0028] The actual gun position of the oxygen gun was manually measured and the result was 101.5 cm.

[0029] The predicted result deviates from the actual measurement result by 0.26 cm, with an error of 0.26%. This shows that the prediction model has high accuracy and can truly reflect the actual gun position.

[0030] Example 3 A steel mill has a converter with a furnace age of 1000. In the early stage of furnace service, the factors affecting bottom blowing are: 0.1, bottom blowing affects the gun height -3cm. Under standard conditions, the oxygen gun height 100cm, oxygen flow rate 480m 3 / min.

[0031] During the smelting process, the actual oxygen flow 470m 3 / min.

[0032] Substituting the above parameters into the formula, the position of the oxygen lance under the above process conditions can be calculated. It is 98.65cm.

[0033] The actual gun position of the oxygen gun was manually measured and the result was 100.5cm.

[0034] The deviation between the predicted result and the actual measurement result is -1.85cm, and the error is -1.84%. It can be seen that the prediction model is highly accurate and can truly reflect the actual gun position.

[0035] Example 4 A steel converter in a steel plant has a furnace age of 1580. In the early stage of furnace service, the factors affecting bottom blowing 0.1, bottom blowing affects the gun height -3cm. Under standard conditions, the oxygen gun height 100cm, oxygen flow rate 480m 3 / min.

[0036] During the smelting process, the actual oxygen flow 460m 3 / min.

[0037] Substituting the above parameters into the formula, the position of the oxygen lance under the above process conditions can be calculated. It is 97.59cm.

[0038] The actual gun position of the oxygen gun was manually measured and the result was 99.5cm.

[0039] The deviation between the predicted result and the actual measurement result is -1.91cm, with an error of -1.91%. It can be seen that the prediction model is highly accurate and can truly reflect the actual gun position.

[0040] Example 5 A steel converter in a steel plant with a furnace age of 5580 furnaces, in the early stage of furnace service, the factors affecting bottom blowing 0.15, bottom blowing affects the gun height -5cm. Under standard conditions, the oxygen gun height 100cm, oxygen flow rate 480m 3 / min.

[0041] During the smelting process, the actual oxygen flow 510m 3 / min.

[0042] Substituting the above parameters into the formula, the position of the oxygen lance under the above process conditions can be calculated. It is 102.33cm.

[0043] The actual gun position of the oxygen gun was manually measured and the result was 99.8cm.

[0044] The predicted result deviates from the actual measurement result by 2.53 cm, with an error of 2.54%. This shows that the prediction model is highly accurate and can truly reflect the actual gun position.

[0045] Example 6 A steel mill has a converter with a furnace age of 5001. In the early stage of furnace service, the factors affecting bottom blowing are: 0.15, bottom blowing affects the gun height -5cm. Under standard conditions, the oxygen gun height 100cm, oxygen flow rate 480m 3 / min.

[0046] During the smelting process, the actual oxygen flow 520m 3 / min.

[0047] Substituting the above parameters into the formula, the position of the oxygen lance under the above process conditions can be calculated. It is 103.33cm.

[0048] The actual gun position of the oxygen gun was manually measured and the result was 99.8cm.

[0049] The predicted result deviates from the actual measurement result by 3.53 cm, with an error of 3.53%. This shows that the prediction model has high accuracy and can truly reflect the actual gun position.

[0050] Example 7 A steel converter in a steel plant with a furnace age of 9500 furnaces, in the early stage of furnace service, the factors affecting bottom blowing 0.15, bottom blowing affects the gun height -5cm. Under standard conditions, the oxygen gun height 100cm, oxygen flow rate 480m 3 / min.

[0051] During the smelting process, the actual oxygen flow 450m 3 / min.

[0052] Substituting the above parameters into the formula, the position of the oxygen lance under the above process conditions can be calculated. It is 96.07cm.

[0053] The actual gun position of the oxygen gun was manually measured and the result was 97.5cm.

[0054] The deviation between the predicted result and the actual measurement result is -1.43cm, with an error of -1.47%. It can be seen that the prediction model is highly accurate and can truly reflect the actual gun position.

[0055] Example 8 A steel converter in a steel plant with a furnace age of 8880 furnaces, in the early stage of furnace service, the factors affecting bottom blowing 0.15, bottom blowing affects the gun height -5cm. Under standard conditions, the oxygen gun height 100cm, oxygen flow rate 480m 3 / min.

[0056] During the smelting process, the actual oxygen flow 460m 3 / min.

[0057] Substituting the above parameters into the formula, the position of the oxygen lance under the above process conditions can be calculated. It is 97.14cm.

[0058] The actual gun position of the oxygen gun was manually measured and the result was 95.5cm.

[0059] The predicted result deviates from the actual measurement result by 1.91 cm, with an error of 1.72%. This shows that the prediction model has high accuracy and can truly reflect the actual gun position.

[0060] The above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the present invention can still be modified or replaced by equivalents. Any modification or partial replacement that does not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A method for accurately predicting the position of a converter oxygen lance, characterized in that: According to the influence of oxygen flow and converter bottom blowing, it is calculated by the formula; the formula is: ; Official: The oxygen lance position during converter smelting, unit: cm; The oxygen lance height under standard conditions, in cm; is the actual oxygen flow rate, unit is m 3 / min; It is the oxygen flow rate under standard conditions, in m 3 / min; is the influencing factor of converter bottom blowing, with a value of 0.1 in the early stage of the campaign and 0.15 in the late stage of the campaign; Because the bottom blowing of the converter affects the lance height, the value in the early stage of the furnace campaign is -3cm; the value in the late stage of the furnace campaign is -5cm; the early stage of the furnace campaign refers to furnace age ≤ 5000 furnaces; the late stage of the furnace campaign refers to furnace age > 5000 furnaces.

2. The method for accurately predicting the position of the converter oxygen lance according to claim 1, characterized in that: The method is applicable to ;in, is the minimum oxygen flow rate, in m 3 / min; is the maximum oxygen flow rate, in m 3 / min; the maximum oxygen flow rate and minimum oxygen flow rate are the values under normal process conditions.

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