Method for judging activity of hearth by using components of blast furnace slag and molten iron

Abstract

The invention relates to a method for judging the activity of a hearth by using the components of blast furnace slag and molten iron, which comprises the following steps: acquiring the components of the blast furnace slag and the components of the molten iron under different iron times; calculating distribution coefficients of sulfur between slag and iron under different iron times according to the blast furnace slag components and the molten iron components; screening out a distribution coefficient corresponding to the iron number meeting a preset condition; normal distribution verification is carried out on the distribution coefficient, and when normal distribution is not met, abnormal values are removed, and normal distribution verification is carried out on the distribution coefficient again; determining an operation distribution limit according to the distribution coefficient meeting normal distribution; and when the distribution coefficient under the target iron number exceeds the operation distribution limit, the working state of the hearth is abnormal. According to the method, the working states of the hearth in different production states can be judged by calculating the distribution coefficient of sulfur in different iron times between slag and iron, so that workers can conveniently and timely find out the problems of local accumulation or insufficient activity of the hearth, accident expansion is avoided, and stable operation of a blast furnace is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of blast furnace smelting, in particular to a method for judging the activity of a blast furnace hearth by using the composition of blast furnace slag and molten iron. BACKGROUND

[0002] The blast furnace is the most important smelting equipment in the steel industry, and its operating efficiency, thermal stability and production capacity are directly affected by the activity of the hearth. The activity of the hearth, on the one hand, refers to the activity degree of the metallurgical reaction and the mass and heat transfer process in the hearth area, and on the other hand, reflects the uniformity and stability of the local temperature field, material flow and slag-iron interaction in the hearth. The activity of the hearth directly affects the slag-iron ratio, the stability of tapping and the energy consumption level, and is an important criterion for the long-term stable and smooth operation of the blast furnace.

[0003] At present, the method for judging the activity of the blast furnace hearth is mainly based on the production experience of the staff, which is prone to misjudgment. SUMMARY

[0004] To solve the above problems, the purpose of the embodiments of the present application is to provide a method for judging the activity of a blast furnace hearth by using the composition of blast furnace slag and molten iron.

[0005] A method for judging the activity of a blast furnace hearth by using the composition of blast furnace slag and molten iron, comprising:

[0006] Step 1: obtaining the composition of blast furnace slag and the composition of molten iron under different iron times;

[0007] Step 2: calculating the distribution coefficient of sulfur between slag and iron under different iron times according to the composition of blast furnace slag and the composition of molten iron;

[0008] Step 3: selecting the distribution coefficient corresponding to the iron time that meets the preset condition;

[0009] Step 4: normal distribution verification is performed on the distribution coefficient, and when the normal distribution is not met, the abnormal value is removed and the normal distribution verification is performed again on the distribution coefficient;

[0010] Step 5: determining the running distribution limit according to the distribution coefficient that meets the normal distribution;

[0011] Step 6: when the distribution coefficient under the target iron time exceeds the running distribution limit, the working state of the hearth is abnormal.

[0012] Preferably, in the step 1, the sulfur content, calcium oxide content, silicon dioxide content, magnesium oxide content and aluminum oxide content in the slag are obtained; the sulfur content, the physical temperature of the molten iron and the sulfur load of the blast furnace are obtained.

[0013] Preferably, in the step 2, the distribution coefficient of sulfur between slag and iron is the ratio of the sulfur content in the corresponding iron slag to the sulfur content in the molten iron.

[0014] Preferably, in the step 3, the distribution coefficient corresponding to the iron secondary under the preset conditions is selected when the slag basicity, the slag magnesium-aluminum ratio, the physical temperature of the molten iron and the blast furnace sulfur load are all in the preset conditions.

[0015] Preferably, in the step 3, the slag basicity = the calcium oxide content / the silicon dioxide content; and the slag magnesium-aluminum ratio = the magnesium oxide content / the aluminum oxide content.

[0016] Preferably, in the step 6, the working state of the hearth is abnormal when the distribution coefficient under the target iron secondary continuously decreases within a set time interval.

[0017] The application further provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to realize the steps of the method for judging the hearth activity by using the blast furnace slag and the molten iron composition.

[0018] According to the specific embodiments of the application, the following technical effects are disclosed:

[0019] The application relates to a method for judging the hearth activity by using the blast furnace slag and the molten iron composition.

[0020] In order to make the above objectives, characteristics and advantages of the present application more apparent, clear and easy to understand, the following preferred embodiments are specifically described in detail below, and the accompanying drawings are referred to. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0022] Figure 1 The application provides a method for judging the hearth activity by using the blast furnace slag and the molten iron composition.

[0023] Figure 2 The application provides a normal distribution diagram.

[0024] Figure 3 The application provides an L S Data running diagram. DETAILED DESCRIPTION

[0025] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0026] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific circumstances.

[0027] Please refer to Figure 1 A method for judging the activity of the hearth by using the composition of blast furnace slag and molten iron, comprising:

[0028] Step 1: Obtain the composition of blast furnace slag and molten iron under different iron times;

[0029] In the step 1, the sulfur content, calcium oxide content, silicon dioxide content, magnesium oxide content, aluminum oxide content in the slag; the sulfur content, physical temperature of molten iron and sulfur load of blast furnace in the molten iron are obtained.

[0030] Step 2: Calculate the distribution coefficient of sulfur between slag and iron under different iron times according to the composition of blast furnace slag and molten iron;

[0031] Define the slag basicity R = CaO / SiO2; the slag magnesium aluminum ratio = MgO / Al2O3; define the distribution coefficient L of sulfur (S) between slag and iron S is the ratio of the sulfur content in the slag of the iron time to the sulfur content in the molten iron of the iron time, that is, [S] slag / [S] iron.

[0032] Step 3: Screen out the distribution coefficient corresponding to the iron time that meets the preset condition;

[0033] Use the way of multi-layer condition nesting to establish L S Sample. It is required to comprehensively L S The number of samples is greater than 30. The nested conditions are generally selected within the set range of slag basicity R (CaO / SiO2), slag magnesium aluminum ratio MgO / Al2O3, physical temperature and sulfur load.

[0034] Step 4: Normal distribution verification is performed on the distribution coefficient, and when the normal distribution is not met, the abnormal value is removed to perform the normal distribution verification on the distribution coefficient again;

[0035] In step 4, the L S data under the daily production condition is subjected to normal distribution verification. If there is no record error or other abnormal condition in the data, the L S data is normally distributed. If it is not normally distributed, the abnormal reason should be found out, and after the abnormal influence is removed, the normal verification is performed again.

[0036] Step 5: The running distribution limit is determined according to the distribution coefficient meeting the normal distribution.

[0037] Step 6: When the distribution coefficient under the target iron next is greater than the running distribution limit, the working state of the hearth appears to be abnormal.

[0038] In step 6, the running graph is drawn according to the L S data in the normal production stage. If the L S data continuously decreases or continuously breaks through the lower limit of the control, the active state of the hearth should be concerned, which indicates that under the same slag condition, the L S data is continuously deteriorated, and the activity of the hearth may have a problem, resulting in the problem of sulfur diffusion.

[0039] The working principle of the present application will be further explained in combination with specific embodiments as follows:

[0040] 1. Determine the statistical items: the slag S, CaO, SiO2, MgO and Al2O3, the hot metal S, the sulfur load of the blast furnace and the physical temperature of the hot metal are listed as the statistical items.

[0041] 2. Data matching: the hot metal composition is matched with the slag composition of the same iron next according to the iron next, as shown in Table 1.

[0042] Table 1

[0043]

[0044] 3. Define the slag basicity R = CaO / SiO2, the slag magnesium-aluminum ratio = MgO / Al2O3, and define the distribution coefficient L S of sulfur (S) between the slag and the hot metal as the ratio of the S content in the slag of the same iron next to the S content in the hot metal of the same iron next, i.e. [S] 渣 / [S] 铁 . As shown in Table 2.

[0045] Table 2

[0046]

[0047] 4. Use the multi-layer condition nesting method to establish the L S sample. The comprehensive L S The sample number is greater than 30.

[0048] In the L S The data has 50, and the 50 data is selected into step 5.

[0049] 5. The L S Data is verified for normal distribution.

[0050] The normal distribution verification of data can be easily realized by using statistical methods or software, Figure 2 The P value is greater than 0.05, which means that the 50 L S Data in step 4 is normally distributed with a mean of 47.61 and a standard deviation of 9.670.

[0051] 6. If there is no record error or other abnormal condition L S Data should be normally distributed, if not, abnormal reasons should be found out and normal verification should be carried out again.

[0052] 7. According to the normal distribution of L S Data to determine the running distribution limit.

[0053]

[0054] Where, μ is the mean, which determines the center position of the distribution, σ is the standard deviation, which determines the width of the distribution, and x is the value of the random variable.

[0055] According to the data in step 5, the above formula can be calculated under the premise of step 5 L S Data has only 10% probability lower than 35.22.

[0056] 8. According to the L S Data of normal production stage (need to collect data under the condition of step 4) to draw running chart. The average value 47.61 determined in step 5 and the lower limit 35.22 determined in step 7 are used as the marking line. The L S Data generated in recent years under the condition of step 4 is filled in the running chart according to time sequence.

[0057] 9. The L S Data continues to decline or continuously breaks through the control lower limit, which needs to pay attention to the active state of the furnace, which indicates that under the same slag condition, the L SThe data is deteriorating, and the activity of the furnace hearth may be problematic, leading to issues with sulfur diffusion. For example... Figure 3 As shown, it can be seen that L after 10 o'clock S The number began to decline continuously, and at 2 PM it fell below the lower limit; this is a low-probability event. (Explanation: L) S An abnormality has occurred and should be monitored immediately; the working condition of the furnace hearth is already showing signs of deterioration.

[0058] This invention can determine the working status of the hearth under different production conditions by calculating the distribution coefficient of sulfur between slag and iron under different iron grades. This makes it easier for staff to detect problems such as local accumulation or insufficient activity in the hearth in a timely manner, avoid the escalation of accidents, and ensure the stable operation of the blast furnace.

[0059] Furthermore, this embodiment of the invention also provides a computer-readable storage medium storing a computer program thereon. When the computer program is executed by a processor, it implements the various processes in the above-described method for determining hearth activity using blast furnace slag and molten iron composition, and achieves the same technical effect. To avoid repetition, it will not be described again here.

[0060] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for determining hearth activity using the composition of blast furnace slag and molten iron, characterized in that, include: Step 1: Obtain the composition of blast furnace slag and molten iron from different iron batches; Step 2: Calculate the distribution coefficient of sulfur between slag and iron in different iron grades based on the composition of blast furnace slag and molten iron; Step 3: Filter out the allocation coefficients corresponding to the iron grades that meet the preset conditions; Step 4: Perform normality verification on the allocation coefficients. If the normality is not satisfied, remove outliers and perform normality verification on the allocation coefficients again. Step 5: Determine the operating distribution limits based on the allocation coefficients that satisfy the normal distribution; Step 6: When the distribution coefficient under the target iron grade exceeds the operating distribution limit, the working state of the hearth becomes abnormal.

2. The method for determining hearth activity using the composition of blast furnace slag and molten iron according to claim 1, characterized in that, In step 1, the sulfur content, calcium oxide content, silicon dioxide content, magnesium oxide content, and aluminum oxide content in the slag are obtained; the sulfur content, physical temperature of the molten iron, and sulfur load of the blast furnace are obtained.

3. The method for determining hearth activity using the composition of blast furnace slag and molten iron according to claim 1, characterized in that, In step 2, the sulfur distribution coefficient between slag and iron is the ratio of the sulfur content in the corresponding iron slag to the sulfur content in the molten iron.

4. The method for determining hearth activity using the composition of blast furnace slag and molten iron according to claim 1, characterized in that, In step 3, the distribution coefficients corresponding to the iron grade are selected when the slag basicity, slag magnesium-aluminum ratio, molten iron physical temperature, and blast furnace sulfur load are all under preset conditions.

5. The method for determining hearth activity using the composition of blast furnace slag and molten iron according to claim 4, characterized in that, In step 3, slag basicity = calcium oxide content / silicon dioxide content; slag magnesium-aluminum ratio = magnesium oxide content / aluminum oxide content.

6. The method for determining hearth activity using the composition of blast furnace slag and molten iron according to claim 1, characterized in that, In step 6, when the distribution coefficient under the target iron grade continuously decreases within a set time interval, the working state of the hearth becomes abnormal.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps in the method for determining hearth activity using the composition of blast furnace slag and molten iron as described in any one of claims 1 to 6.

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