Method for judging influence of blast furnace cooling water temperature adjustment on wall body temperature

Abstract

The invention relates to a method for judging the influence of blast furnace cooling water temperature adjustment on wall body temperature. The method comprises the steps that wall body temperature samples before and after blast furnace cooling water temperature adjustment are obtained; performing equal variance test on the wall body temperature sample before the water temperature is adjusted and the wall body temperature sample after the water temperature is adjusted to obtain a variance test result; carrying out mean value inspection on the wall body temperature sample before the water temperature is adjusted and the wall body temperature sample after the water temperature is adjusted to obtain a mean value inspection result; when both the variance test result and the mean value test result pass, the change of the water temperature has no influence on the temperature stability of the wall body; and when the variance test result or the mean value test result does not pass, the stability of the wall body is influenced after the water temperature change. Through dual verification of variance verification and mean value verification, the influence of cooling water temperature adjustment on the wall body temperature can be comprehensively evaluated, and the reliability of a conclusion is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of blast furnace ironmaking, and in particular to a method for judging the influence of blast furnace cooling water temperature adjustment on wall temperature. Background Art

[0002] Adjusting the cooling water temperature of the blast furnace staves is one of the primary means of adjusting the cooling system during blast furnace ironmaking. Its importance lies in the following aspects: When the water temperature is low, the heat exchange efficiency is high, which can more effectively remove heat from the blast furnace, rapidly reduce the temperature near the staves, and better protect the staves and blast furnace lining. When the water temperature is high, the temperature difference between the water and the furnace is small, resulting in insufficient heat transfer and poor cooling. This can cause the stave surface temperature to rise, affecting its protective effect on the blast furnace lining. In severe cases, it may damage the refractory lining and shorten its service life. Low water temperatures increase the operating costs and energy consumption of the cooling system. Currently, there is a lack of clear, scientific criteria for evaluating changes in the mean wall temperature after water temperature adjustment, particularly for wall temperature stability. Summary of the Invention

[0003] To solve the above problems, an embodiment of the present invention aims to provide a method for determining the impact of blast furnace cooling water temperature adjustment on the wall temperature.

[0004] A method for determining the effect of blast furnace cooling water temperature adjustment on blast furnace wall temperature, comprising:

[0005] Step 1: Obtain the wall temperature samples before and after the blast furnace cooling water temperature is adjusted;

[0006] Step 2: Perform an equal variance test on the wall temperature samples before and after water temperature adjustment to obtain the variance test results;

[0007] Step 3: Perform a mean test on the wall temperature samples before and after the water temperature adjustment to obtain a mean test result;

[0008] Step 4: When both the variance test result and the mean test result pass, it means that the water temperature change has no effect on the wall temperature stability; when the variance test result or the mean test result does not pass, it means that the water temperature change affects the wall stability.

[0009] Preferably, performing an equal variance test on the wall temperature samples before and after the water temperature adjustment includes:

[0010] Step 2.1: Calculate the sample dispersion;

[0011] Step 2.2: Calculate the between-group sum of squares and within-group sum of squares based on the sample deviation;

[0012] Step 2.3: Calculate the statistic based on the between-group sum of squares and the within-group sum of squares;

[0013] Step 2.4: When the statistic is less than the significance level threshold, it is considered that the variances of the wall temperature samples before and after water temperature adjustment are different;

[0014] Step 2.5: When the statistic is greater than or equal to the significance level threshold, it is considered that the variances of the wall temperature samples before and after water temperature adjustment are the same, and the equal variance test is passed.

[0015] Preferably, in step 2.1, when the sample conforms to the normal distribution, the mean deviation is used:

[0016]

[0017] Among them, z ij represents the mean deviation of the i-th group of samples, x ij represents the j-th observation value of the i-th group of samples, represents the mean of the samples in group i;

[0018] When the sample does not follow a normal distribution, use the median deviation:

[0019] z ij =|x ij -Median(x i )|

[0020] Among them, Median(x i ) represents the median of the samples in group i.

[0021] Preferably, in step 2.2, the formula for calculating the sum of squares between groups is:

[0022]

[0023] The formula for calculating the within-group sum of squares is:

[0024]

[0025] Among them, SSB represents the sum of squares between groups, SSW represents the sum of squares within groups, k represents the number of groups, and n i represents the sample size of the i-th group of samples, represents the grand mean of all data, represents the group mean of the jth group.

[0026] Preferably, in step 2.3, the calculation formula of the statistic is:

[0027]

[0028] Among them, W represents the statistic, N represents the total sample size, and k represents the number of groups.

[0029] Preferably, the step 3: performing a mean test on the wall temperature samples before and after the water temperature adjustment to obtain a mean test result includes:

[0030] The present invention also provides an electronic device, comprising a bus, a transceiver, a memory, a processor, and a computer program stored in the memory and runnable on the processor, wherein the transceiver, the memory, and the processor are connected via the bus, and wherein the computer program, when executed by the processor, implements the steps in the above-mentioned method for determining the impact of adjusting the cooling water temperature of a blast furnace on the wall temperature.

[0031] The present invention also provides a computer-readable storage medium having a computer program stored thereon, characterized in that when the computer program is executed by a processor, the steps in the above-mentioned method for determining the impact of blast furnace cooling water temperature adjustment on wall temperature are implemented.

[0032] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0033] The present invention relates to a method for determining the influence of cooling water temperature adjustment on the wall temperature of a blast furnace. Compared with the prior art, the present invention uses dual verification of variance test and mean test to comprehensively evaluate the influence of cooling water temperature adjustment on the wall temperature, thereby improving the reliability of the conclusion.

[0034] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0036] Figure 1 This is a flow chart of a method for determining the impact of blast furnace cooling water temperature adjustment on wall temperature provided by the present invention. DETAILED DESCRIPTION

[0037] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0039] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0040] See also Figure 1 A method for determining the effect of blast furnace cooling water temperature adjustment on blast furnace wall temperature includes:

[0041] Step 1: Obtain the wall temperature samples before and after the blast furnace cooling water temperature is adjusted;

[0042] Step 2: Perform an equal variance test on the wall temperature samples before and after water temperature adjustment to obtain the variance test results;

[0043] Furthermore, step 2 includes:

[0044] Step 2.1: Calculate the sample dispersion;

[0045] In step 2.1, when the sample follows a normal distribution, use the mean deviation:

[0046]

[0047] Among them, z ij represents the mean deviation of the i-th group of samples, x ijrepresents the j-th observation value of the i-th group of samples, represents the mean of the samples in group i;

[0048] When the sample does not follow a normal distribution, use the median deviation:

[0049] z ij =|x ij -Median(x i )|

[0050] Among them, Median(x i ) represents the median of the samples in group i.

[0051] Step 2.2: Calculate the between-group sum of squares and within-group sum of squares based on the sample deviation;

[0052] In step 2.2, the formula for calculating the sum of squares between groups is:

[0053]

[0054] The formula for calculating the within-group sum of squares is:

[0055]

[0056] Among them, SSB represents the sum of squares between groups, SSW represents the sum of squares within groups, k represents the number of groups, and n i represents the sample size of the i-th group of samples, represents the grand mean of all data, represents the group mean of group j.

[0057] Step 2.3: Calculate the statistic based on the between-group sum of squares and the within-group sum of squares;

[0058] In step 2.3, the calculation formula of the statistic is:

[0059]

[0060] Among them, W represents the statistic, N represents the total sample size, and k represents the number of groups.

[0061] Step 2.4: When the statistic is less than the significance level threshold, it is considered that the variances of the wall temperature samples before and after water temperature adjustment are different;

[0062] Step 2.5: When the statistic is greater than or equal to the significance level threshold, it is considered that the variances of the wall temperature samples before and after water temperature adjustment are the same, and the equal variance test is passed.

[0063] Step 3: Perform a mean test on the wall temperature sample before and after water temperature adjustment to obtain the mean test results; perform a mean test on the two samples. A two-sample mean test is a statistical method used to determine whether the population means of the two samples are significantly different.

[0064] Step 4: When both the variance test result and the mean test result pass, it means that the water temperature change has no effect on the wall temperature stability; when the variance test result or the mean test result does not pass, it means that the water temperature change affects the wall stability.

[0065] The following is a further description of a method for determining the effect of blast furnace cooling water temperature adjustment on wall temperature according to the present invention, with reference to specific embodiments:

[0066] (1) After collecting the wall temperature data before the water temperature is increased, 30 data are randomly selected to form T1. After collecting the wall temperature data after the water temperature is increased, 30 data are randomly selected to form sample T2.

[0067] (2) Perform an equal variance test on T1 and T2. The test results are shown in Table 1. From the test results, it can be seen that the variances of the two samples are equal, indicating that the stability of the wall does not change significantly after the water temperature increases.

[0068] Table 1

[0069] method Test statistic P-value Multiple comparisons — 0.926 Levene 0.00 0.970

[0070] (3) Perform a mean test on the two samples. The test results are shown in Table 2-3. From the mean test results of the two samples, there is no significant difference between the two sample means. This indicates that after the water temperature increases, there is no obvious evidence to show that the mean of the wall temperature has changed, and the wall needs to be treated.

[0071] Table 2

[0072]

[0073] Table 3

[0074]

[0075] The present invention also provides an electronic device, comprising a bus, a transceiver, a memory, a processor, and a computer program stored in the memory and runnable on the processor, wherein the transceiver, the memory, and the processor are connected via the bus, and is characterized in that when the computer program is executed by the processor, the steps in the above-mentioned method for determining the impact of adjusting the cooling water temperature of a blast furnace on the wall temperature are implemented. Compared with the prior art, the beneficial effects of the electronic device provided by the present invention are the same as the beneficial effects of the method for determining the impact of adjusting the cooling water temperature of a blast furnace on the wall temperature described in the above-mentioned technical solution, and are not elaborated here.

[0076] The present invention also provides a computer-readable storage medium having a computer program stored thereon, characterized in that when the computer program is executed by a processor, the steps in the above-mentioned method for determining the impact of blast furnace cooling water temperature adjustment on wall temperature are implemented. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided by the present invention are the same as the beneficial effects of the method for determining the impact of blast furnace cooling water temperature adjustment on wall temperature described in the above-mentioned technical solution, and will not be elaborated here.

[0077] 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 technical solution that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A method for determining the effect of blast furnace cooling water temperature adjustment on wall temperature, characterized in that: include: Step 1: Obtain the wall temperature samples before and after the blast furnace cooling water temperature is adjusted; Step 2: Perform an equal variance test on the wall temperature samples before and after water temperature adjustment to obtain the variance test results; Step 3: Perform a mean test on the wall temperature samples before and after the water temperature adjustment to obtain a mean test result; Step 4: When both the variance test result and the mean test result pass, it means that the water temperature change has no effect on the wall temperature stability; When the variance test result or the mean test result fails, it means that the change in water temperature affects the stability of the wall.

2. The method for determining the effect of blast furnace cooling water temperature adjustment on wall temperature according to claim 1, characterized in that: The equal variance test for the wall temperature samples before and after the water temperature adjustment is performed includes: Step 2.1: Calculate the sample dispersion; Step 2.2: Calculate the between-group sum of squares and within-group sum of squares based on the sample deviation; Step 2.3: Calculate the statistic based on the between-group sum of squares and the within-group sum of squares; Step 2.4: When the statistic is less than the significance level threshold, it is considered that the variances of the wall temperature samples before and after water temperature adjustment are different; Step 2.5: When the statistic is greater than or equal to the significance level threshold, it is considered that the variances of the wall temperature samples before and after water temperature adjustment are the same, and the equal variance test is passed.

3. The method for determining the effect of blast furnace cooling water temperature adjustment on wall temperature according to claim 2, characterized in that: In step 2.1, when the sample follows a normal distribution, use the mean deviation: Among them, z ij Indicates the mean deviation of the i-th group of samples, x ij represents the j-th observation value of the i-th group of samples, represents the mean of the samples in group i; When the sample does not follow a normal distribution, use the median deviation: z ij =|x ij -Median(x i )| Among them, Median(x i ) represents the median of the samples in group i.

4. The method for determining the effect of blast furnace cooling water temperature adjustment on wall temperature according to claim 3, characterized in that: In step 2.2, the formula for calculating the sum of squares between groups is: The formula for calculating the within-group sum of squares is: Among them, SSB represents the sum of squares between groups, SSW represents the sum of squares within groups, k represents the number of groups, and n i represents the sample size of the i-th group of samples, represents the grand mean of all data, represents the group mean of group j.

5. The method for determining the effect of blast furnace cooling water temperature adjustment on wall temperature according to claim 4, characterized in that: In step 2.3, the calculation formula of the statistic is: Among them, W represents the statistic, N represents the total sample size, and k is the number of groups.

6. An electronic device comprising a bus, a transceiver, a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the transceiver, the memory, and the processor are connected via the bus, wherein: When the computer program is executed by the processor, the steps of the method for determining the impact of blast furnace cooling water temperature adjustment on wall temperature are implemented as described in any one of claims 1 to 5.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method for determining the influence of blast furnace cooling water temperature adjustment on wall temperature are implemented as described in any one of claims 1 to 5.

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