Method for accurately adding center coke during blast furnace burden distribution

Abstract

The invention discloses a blast furnace burden distribution accurate center coke adding method which comprises the following steps: about 62% of center coke amount falls in a middle ring belt in the process that a burden distribution chute tilts a burden distribution angle from a secondary center to a center, so that the accuracy of the amount of coke added to the center of a furnace throat is not high, the center airflow is wide and unstable, and the gas utilization rate fluctuation is large; the material flow valve is turned down in the process that the material distribution chute tilts from the secondary center to the center, coke falling on the middle annular belt is reduced, the center coke amount is increased, the center air permeability is improved, a blast furnace hearth is activated to form narrow and strong center air flow, and gas utilization is improved; according to the setting program, the material flow in the tilting process of a distribution chute during coke distribution is controlled to be 18 degrees, the initial material flow opening degree is restored after the tilting angle is in place, and it is guaranteed that the center coke adding amount is stabilized to be 14%-15% of the total coke amount; the adding amount of the center coke is obviously increased, and the gas utilization rate is effectively improved; the coke is effectively utilized, and the fuel consumption is obviously reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of industrial automated blast furnace ironmaking, and in particular relates to a method for accurately distributing charge to a blast furnace and adding center coke. Background Art

[0002] In the blast furnace ironmaking process, center coking plays a vital role in adjusting the airflow distribution and temperature distribution in the blast furnace and improving the gas utilization rate. However, there are many problems in the existing blast furnace charge distribution and center coking methods. For example, inaccurate charge distribution makes it difficult to control the center coking amount within the ideal range, which in turn affects the charge distribution and gas utilization efficiency in the blast furnace. Common factors such as charge chute wear, flow valve failure, and unreasonable charge parameter settings will lead to deviations in the center coking amount, affecting the stability and economy of blast furnace production. In the blast furnace ironmaking process, about 62% of the center coke falls on the middle ring when the charge chute tilts from the secondary center to the center, and the accuracy of the coke added to the center of the furnace throat is not high. In addition, the center airflow is wide and unstable, and the gas utilization rate fluctuates greatly. Inaccurate center coke distribution leads to high fuel consumption.

[0003] The present invention closes the material flow valve during the tilting process of the distribution chute from the sub-center to the center, reduces the coke falling on the middle ring belt, and increases the amount of coke in the center, which not only improves the center permeability and activates the blast furnace hearth, but also forms a "narrow and strong" center airflow, thereby improving gas utilization; a program is set to control the material flow during the tilting process of the distribution chute from the sub-center to the center and from the center to the sub-center when distributing coke, and then restores the initial material flow opening after the tilting angle is in place, thereby ensuring that the center coke amount is stabilized at 14%-15% of the total coke amount; this is beneficial to significantly increase the amount of center coke added, develop the center airflow, narrow the center, make the center airflow more stable, and effectively improve the gas utilization rate; after the adjustment, the center can accurately distribute and add coke, the gas utilization rate is improved, the coke is effectively utilized, and the fuel consumption is significantly reduced. Summary of the invention

[0004] The object of the present invention is to provide a method for accurately distributing charge to a blast furnace and adding center coke, so as to solve at least one of the above-mentioned problems of the prior art.

[0005] In a first aspect, the present invention provides a method for accurately placing charge on a blast furnace and adding center coke, comprising:

[0006] Step 1: During the monitoring period, the utilization rate of blast furnace gas is analyzed, and based on the analysis results, it is determined whether the fluctuation of the gas utilization rate is abnormal. If so, an abnormal signal is generated;

[0007] Step 2: Based on the abnormal signal, analyze the gas utilization rate fluctuation curve and the central coke amount curve to obtain the slope deviation ratio; compare the slope deviation ratio with the slope deviation ratio threshold, and if the slope deviation ratio is less than the slope deviation ratio threshold, generate a correlation signal;

[0008] Step 3: Based on the correlation signal, the material flow valve opening angle is divided to obtain the material flow valve opening angle interval, and the center coking amount within the material flow valve opening angle interval is analyzed to obtain the interval deviation value; the interval standard deviation values ​​of all material flow valve opening angle intervals are compared with each other, and the optimal material flow valve opening angle interval is obtained according to the comparison result;

[0009] Step 4: Divide the optimal flow valve opening angle interval into smaller valve opening angle values; analyze the gas utilization rate of the valve opening angle value to obtain the over-limit quantity ratio; analyze the over-limit quantity ratio to generate an over-limit signal; divide the analysis into the first analysis state, the second analysis state, and the third analysis state according to the number of over-limit signals to obtain the first angle priority value and the second angle priority value; analyze the first angle priority value or the second angle priority value to obtain the optimal valve opening angle;

[0010] Step 5: Adjust the valve opening angle of the distribution chute according to the optimal valve opening angle, and add central coke into the blast furnace for precise distribution.

[0011] In a second aspect, the present invention provides a system for accurately distributing charge to a blast furnace and adding center coking, comprising:

[0012] Abnormal analysis module: During the monitoring period, the utilization rate of blast furnace gas is analyzed, and based on the analysis results, it is determined whether the fluctuation of gas utilization rate is abnormal. If so, an abnormal signal is generated;

[0013] Correlation analysis module: Based on the abnormal signal, the gas utilization rate fluctuation curve and the central coke amount curve are analyzed to obtain the slope deviation ratio; the slope deviation ratio is compared with the slope deviation ratio threshold, and if the slope deviation ratio is less than the slope deviation ratio threshold, a correlation signal is generated;

[0014] Angle interval analysis module: Based on the correlation signal, the material flow valve opening angle is divided to obtain the material flow valve opening angle interval, and the center coking amount within the material flow valve opening angle interval is analyzed to obtain the interval deviation value; the interval standard deviation values ​​of all material flow valve opening angle intervals are compared with each other, and the optimal material flow valve opening angle interval is obtained according to the comparison results;

[0015] Valve opening angle analysis module: divide the optimal flow valve opening angle interval into smaller valve opening angle values; analyze the gas utilization rate of the valve opening angle value to obtain the over-limit quantity ratio; analyze the over-limit quantity ratio to generate an over-limit signal; divide the analysis into the first analysis state, the second analysis state, and the third analysis state according to the number of over-limit signals to obtain the first angle priority value and the second angle priority value; analyze the first angle priority value or the second angle priority value to obtain the optimal valve opening angle;

[0016] Precision charging module: adjust the valve opening angle of the charging chute according to the optimal valve opening angle, and add central coke into the blast furnace for precise charging.

[0017] Beneficial effects of the present invention:

[0018] 1. The gas composition at the blast furnace gas outlet is obtained in real time through the gas analyzer, and the gas utilization rate is calculated and analyzed in real time; the gas utilization rate fluctuation curve is constructed and its standard deviation is calculated, and compared with the standard deviation threshold, it is accurately determined whether the gas utilization rate fluctuation is abnormal, which provides an effective means to timely discover potential problems in blast furnace operation and avoid problems from worsening and affecting production; when the gas utilization rate fluctuates abnormally, a central coke addition curve is constructed and correlated with the gas utilization rate fluctuation curve; judging the correlation between the two helps to clarify whether the central coke addition is the key factor affecting the gas utilization rate fluctuation; it provides a scientific basis for adjusting the central coke addition of the blast furnace, stabilizes the gas utilization rate by optimizing the central coke addition, and thus improves the blast furnace production efficiency and energy utilization rate.

[0019] 2. By dividing the opening angle of the material flow valve, the central coking amount in each angle range is deeply analyzed, and then the optimal material flow valve opening angle range is screened out; the gas utilization rate under different valve opening angles is deeply analyzed; by analyzing the slope value of the gas utilization rate sub-curve, and classifying and analyzing it according to the occurrence of out-of-bounds signals, the optimal valve opening angle is finally determined; the process fully considers various actual conditions in the blast furnace charging process, and can realize the fine adjustment of the valve opening angle of the charging chute, optimize the charging operation, improve the uniformity and accuracy of the charging, reduce the production problems caused by uneven charging, and achieve the purpose of accurate charging and central coking of the blast furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. 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 creative work.

[0021] Figure 1It is a flowchart for obtaining associated signals of a method for precisely adding central coke in blast furnace burden distribution provided in Embodiment 1 of the present invention;

[0022] Figure 2 It is a flowchart for obtaining the optimal valve opening angle of a method for precisely adding central coke in blast furnace burden distribution provided in Embodiment 2 of the present invention;

[0023] Figure 3 It is a schematic diagram of modules of a system for precisely adding central coke in blast furnace burden distribution provided in Embodiment 3 of the present invention;

[0024] Figure 4 It is a flowchart of steps of a method for precisely adding central coke in blast furnace burden distribution provided by the present invention. Detailed implementation manners

[0025] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0026] Embodiment 1

[0027] As Figure 1 - Figure 4 shown, a method for precisely adding central coke in blast furnace burden distribution provided in an embodiment of the present invention specifically includes the following steps:

[0028] Step 1: During the monitoring period, analyze the utilization rate of blast furnace gas, and based on the analysis result, judge whether the fluctuation of the gas utilization rate is abnormal. If so, generate an abnormal signal;

[0029] During the monitoring period, the gas components at the blast furnace gas outlet are obtained in real time through a gas analyzer, and the contents of carbon monoxide (CO) and carbon dioxide (CO 2 ) in the gas are analyzed; the gas utilization rate is calculated according to the formula gas utilization rate = CO 2 / (CO + CO 2 ) × 100%;

[0030] It should be noted that in the ideal complete combustion state, the carbon element in the gas should be completely converted into CO 2 , if the CO content in the gas is relatively high, it means that part of the carbon is not fully burned and the gas utilization rate is relatively low; on the contrary, the higher the CO 2 content, the higher the gas utilization rate;

[0031] Obtain gas utilization rate; construct an XY two-dimensional coordinate system with time as the X-axis and gas utilization rate as the Y-axis, mark and connect the gas utilization rate in the monitoring period in the XY two-dimensional coordinate system, and obtain a gas utilization rate fluctuation curve; wherein, the gas utilization rate fluctuation curve is divided into n sub-curves, and the gas utilization rate mean Q of each sub-curve is obtained, which is recorded as Q1, Q2, ..., Qn;

[0032] The standard deviation of the gas utilization rate mean Q1, Q2, ..., Qn of each sub-curve in the period is calculated by the standard deviation calculation formula, and the standard deviation of the gas utilization rate in the period is compared with the standard deviation threshold. If the standard deviation of the gas utilization rate in the period is greater than the standard deviation threshold, it means that the fluctuation of the gas utilization rate is abnormal during the monitoring period, and an abnormal signal is generated; otherwise, the fluctuation of the gas utilization rate is normal, and a normal signal is generated;

[0033] Based on normal signals, no action is taken;

[0034] Step 2: Based on the abnormal signal, analyze the gas utilization rate fluctuation curve and the central coke amount curve to obtain the slope deviation ratio; compare the slope deviation ratio with the slope deviation ratio threshold, and if the slope deviation ratio is less than the slope deviation ratio threshold, generate a correlation signal;

[0035] Based on the abnormal signal, the parameters of the central coke amount in the blast furnace during the monitoring period are obtained, and the time is used as the X-axis and the central coke amount in the blast furnace is used as the Y-axis to construct an XY two-dimensional coordinate system. The central coke amount in the blast furnace during the monitoring period is marked and connected in the XY two-dimensional coordinate system to obtain a central coke amount curve; wherein the central coke amount curve is also divided into n sub-curves, and the slope B of each sub-curve is obtained, which are recorded as B1, B2, ..., Bn;

[0036] Obtain the slope q1, q2, ..., qn of each gas utilization rate fluctuation sub-curve Q1, Q2, ..., Qn; wherein the slopes B1, B2, ..., Bn of the center-focused sub-curve correspond one to one with the slopes q1, q2, ..., qn of the gas utilization rate fluctuation sub-curves;

[0037] The slope of the center focusing subcurve is processed by difference with the slope of the corresponding gas utilization rate fluctuation subcurve to obtain the slope difference;

[0038] Compare all slope differences with the slope difference threshold, count the number of slope differences greater than the slope difference threshold, and perform ratio processing on the number of slope differences greater than the slope difference threshold and the total number of slope differences to obtain a slope deviation ratio;

[0039] The slope deviation ratio is compared with the slope deviation ratio threshold, and if the slope deviation ratio is less than the slope deviation ratio threshold, a correlation signal is generated; otherwise, an irrelevant signal is generated;

[0040] Based on irrelevant signals, analyze other factors that may cause large fluctuations in gas utilization;

[0041] The beneficial effects of the embodiments of the present invention are as follows: the gas composition at the blast furnace gas outlet is obtained in real time through a gas analyzer, and the gas utilization rate is calculated and analyzed in real time; a gas utilization rate fluctuation curve is constructed and its standard deviation is calculated, and compared with the standard deviation threshold, to accurately determine whether the gas utilization rate fluctuation is abnormal, which provides an effective means for timely discovering potential problems in blast furnace operation and avoiding problems from worsening and affecting production; when the gas utilization rate fluctuates abnormally, a central coke addition curve is constructed and correlated with the gas utilization rate fluctuation curve; judging the correlation between the two helps to clarify whether the central coke addition is a key factor affecting the gas utilization rate fluctuation; providing a scientific basis for adjusting the central coke addition of the blast furnace, stabilizing the gas utilization rate by optimizing the central coke addition, and thereby improving the blast furnace production efficiency and energy utilization rate.

[0042] Embodiment 2

[0043] like Figure 2 - Figure 4 As shown, a method for accurately placing charge on a blast furnace and adding center coking provided by an embodiment of the present invention specifically comprises the following steps:

[0044] Step 3: Based on the correlation signal, the material flow valve opening angle is divided to obtain the material flow valve opening angle interval, and the center coking amount within the material flow valve opening angle interval is analyzed to obtain the interval deviation value; the interval standard deviation values ​​of all material flow valve opening angle intervals are compared with each other, and the optimal material flow valve opening angle interval is obtained according to the comparison result;

[0045] Based on the correlation signal, the opening angle of the material flow valve during the tilting process of the material distribution chute from sub-center to center and from center to sub-center during coke distribution is regulated;

[0046] The opening angle of the material flow valve during the tilting process of the material distribution chute is divided into m intervals with equal angle intervals; one of the opening angle intervals of the material flow valve is analyzed;

[0047] It should be noted that within one monitoring cycle, the material distribution chute will complete multiple focusing actions;

[0048] Get the amount of coking at the center of the blast furnace when the burden chute in the blast furnace completes a single coking action;

[0049] The center focus amount is processed with the standard center focus amount, and the absolute value of the difference is taken to obtain the center focus difference; the center focus difference is processed with the standard center focus amount to obtain the focus deviation ratio of the blast furnace center;

[0050] The focus deviation ratio of the blast furnace center is compared with the focus deviation ratio threshold. If the focus deviation ratio of the blast furnace center is greater than or equal to the focus deviation ratio threshold, the focus deviation ratio of the corresponding blast furnace center is recorded as the excess deviation ratio, which is recorded as PC.

[0051] Count the number of excess deviation ratios, perform ratio processing on the excess deviation ratio and the total number of focus deviation ratios at the center of the blast furnace to obtain the focus deviation value;

[0052] The excess deviation ratio is processed with the focus deviation ratio threshold value to obtain the deviation excess value of the focus deviation ratio corresponding to the blast furnace center; all the deviation excess values ​​are summed and averaged to obtain the deviation excess mean value, which is recorded as PE;

[0053] The excess deviation ratio PC and the deviation excess mean PE are analyzed and the formula is used. The interval deviation value PL is obtained; wherein a1 and a2 are preset proportional coefficients;

[0054] It should be noted that the interval deviation value indicates the corresponding material flow valve opening angle interval, and when the blast furnace center coke is added, the degree of deviation between the center coke amount of the blast furnace and the standard center coke amount; the larger the interval deviation value, the greater the degree of deviation between the center coke amount of the blast furnace and the standard center coke amount;

[0055] The interval deviation values ​​of all the material flow valve opening angle intervals are compared with each other to obtain the material flow valve opening angle interval with the smallest interval deviation value, which is recorded as the optimal material flow valve opening angle interval;

[0056] Step 4: Divide the optimal flow valve opening angle interval into smaller valve opening angle values; analyze the gas utilization rate of the valve opening angle value to obtain the over-limit quantity ratio; analyze the over-limit quantity ratio to generate an over-limit signal; divide the analysis into the first analysis state, the second analysis state, and the third analysis state according to the number of over-limit signals to obtain the first angle priority value and the second angle priority value; analyze the first angle priority value or the second angle priority value to obtain the optimal valve opening angle;

[0057] In the determined optimal material flow valve opening angle range, it is evenly divided into w smaller valve opening angle values, recorded as I1, I2, ..., Iw; a separate center focusing operation is performed on each subdivided valve opening angle value; after completing the separate center focusing operation on each subdivided valve opening angle value, the gas utilization rate curve in the blast furnace is analyzed to determine the adaptability of each subdivided valve opening angle value;

[0058] After each center focusing at the valve opening angle value, the gas utilization rate curve is analyzed;

[0059] Compare the slope values ​​q1, q2, ..., qn of the gas utilization rate sub-curve with the slope threshold of the gas utilization rate sub-curve; if the slope value of the gas utilization rate sub-curve is greater than or equal to the slope threshold of the gas utilization rate sub-curve, record the corresponding slope value of the gas utilization rate sub-curve as an out-of-bounds slope value;

[0060] Counting the number of over-boundary slope values, performing ratio processing on the number of over-boundary slope values ​​and the total number of slope values ​​of the gas utilization rate sub-curve, and obtaining the over-boundary number ratio of the slope values ​​of the gas utilization rate sub-curve;

[0061] The over-bounded quantity ratio is compared with the over-bounded quantity ratio threshold, and if the over-bounded quantity ratio is greater than or equal to the over-bounded quantity ratio threshold, an over-bounded signal is generated; otherwise, a non-over-bounded signal is generated;

[0062] By analyzing the w equally divided valve opening angle values, a total of w over-limit ratios will be generated, and the total number of over-limit signals and non-over-limit signals generated will also be w;

[0063] The number of generated out-of-bounds signals and non-out-of-bounds signals is analyzed as follows:

[0064] Generate w out-of-bounds signals and 0 out-of-bounds signals, recorded as the first analysis state;

[0065] Generate 0 over-bounded signals and w under-bounded signals, recorded as the second analysis state;

[0066] The generated w signals include both over-boundary signals and under-boundary signals, which are recorded as the third analysis state;

[0067] Based on the first analysis state, in the XY two-dimensional coordinate system, with the standard gas utilization rate as the Y value, a standard gas utilization rate straight line parallel to the X axis is constructed; wherein the gas utilization rate fluctuation curve has the same horizontal length as the standard gas utilization rate straight line;

[0068] The area enclosed by the gas utilization rate fluctuation curve and the standard gas utilization rate straight line is obtained, which is recorded as the first area; and the area enclosed by the standard gas utilization rate straight line and the X-axis, that is, the horizontal length of the standard gas utilization rate straight line, multiplied by the Y value of the standard gas utilization rate straight line, is recorded as the second area, and the first area and the second area are ratioed to obtain the deviation area ratio MJ;

[0069] Obtain the length of the overlapped line segment between the gas utilization rate fluctuation curve and the standard gas utilization rate straight line, record it as the overlapped length, perform ratio processing on the overlapped length and the total length of the standard gas utilization rate straight line, and obtain the overlapped length ratio CD;

[0070] The deviation area ratio MJ and the overlap length ratio CD are processed and the formula is used. Obtain a first angle priority value AB, wherein b1 and b2 are preset proportional coefficients;

[0071] It should be noted that the larger the first angle priority value is, the higher the priority of the corresponding valve opening angle value is;

[0072] Compare the first angle priority values ​​of the w valve opening angle values, and record the valve opening angle value with the largest first angle priority value as the optimal valve opening angle;

[0073] Based on the second analysis state, the peak value and the trough value of the gas utilization rate fluctuation curve are respectively subtracted from the standard gas utilization rate and the absolute value is taken to obtain the peak difference and the trough difference; all the peak differences and the trough differences are summed and averaged to obtain the utilization rate fluctuation mean; the utilization rate fluctuation mean is processed by ratio processing with the utilization rate fluctuation mean threshold to obtain the utilization rate fluctuation mean ratio, which is recorded as JZ;

[0074] Obtain the required material distribution time under the condition of the same amount of focus under different valve opening angles; perform ratio processing on the material distribution time and the material distribution time threshold to obtain the material distribution time ratio, recorded as ST;

[0075] The utilization rate fluctuation mean ratio JZ and the material distribution time ratio ST are processed and the formula is used Obtain a second angle priority value XM, wherein c1 and c2 are preset proportional coefficients;

[0076] It should be noted that the larger the second angle priority value is, the higher the priority of the corresponding valve opening angle value is;

[0077] Compare the second angle priority values ​​of the w valve opening angle values, and record the valve opening angle value with the largest second angle priority value as the optimal valve opening angle;

[0078] Based on the third analysis state, only the valve opening angle value that generates the non-over-limit signal is analyzed, and the analysis process is the same as that of the second analysis state;

[0079] Step 5: Adjust the valve opening angle of the distribution chute according to the optimal valve opening angle, and add central coke into the blast furnace for precise distribution;

[0080] Adjust the valve opening angle of the distribution chute to the optimal valve opening angle to achieve precise distribution of the center coke in the blast furnace;

[0081] The beneficial effects of the embodiments of the present invention are as follows: by dividing the opening angle of the material flow valve, in-depth analysis of the amount of center coking in each angle interval is performed, and then the optimal material flow valve opening angle interval is screened out; the gas utilization rate under different valve opening angles is deeply analyzed; by analyzing the slope value of the gas utilization rate sub-curve, and classifying and analyzing it according to the occurrence of out-of-bounds signals, the optimal valve opening angle is finally determined; the process fully considers various actual conditions in the blast furnace charging process, and can realize the fine adjustment of the valve opening angle of the charging chute, optimize the charging operation, improve the uniformity and accuracy of the charging, reduce the production problems caused by uneven charging, and achieve the purpose of accurate center coking of the blast furnace charging.

[0082] Embodiment 3

[0083] like Figure 3 As shown, a system for accurate blast furnace charge distribution and center coking provided by an embodiment of the present invention specifically includes the following modules:

[0084] Abnormal analysis module: During the monitoring period, the utilization rate of blast furnace gas is analyzed, and based on the analysis results, it is determined whether the fluctuation of gas utilization rate is abnormal. If so, an abnormal signal is generated;

[0085] Correlation analysis module: Based on the abnormal signal, the gas utilization rate fluctuation curve and the central coke amount curve are analyzed to obtain the slope deviation ratio; the slope deviation ratio is compared with the slope deviation ratio threshold, and if the slope deviation ratio is less than the slope deviation ratio threshold, a correlation signal is generated;

[0086] Angle interval analysis module: Based on the correlation signal, the material flow valve opening angle is divided to obtain the material flow valve opening angle interval, and the center coking amount within the material flow valve opening angle interval is analyzed to obtain the interval deviation value; the interval standard deviation values ​​of all material flow valve opening angle intervals are compared with each other, and the optimal material flow valve opening angle interval is obtained according to the comparison results;

[0087] Valve opening angle analysis module: divide the optimal flow valve opening angle interval into smaller valve opening angle values; analyze the gas utilization rate of the valve opening angle value to obtain the over-limit quantity ratio; analyze the over-limit quantity ratio to generate an over-limit signal; divide the analysis into the first analysis state, the second analysis state, and the third analysis state according to the number of over-limit signals to obtain the first angle priority value and the second angle priority value; analyze the first angle priority value or the second angle priority value to obtain the optimal valve opening angle;

[0088] Precision charging module: adjust the valve opening angle of the charging chute according to the optimal valve opening angle, and add central coke into the blast furnace for precise charging.

[0089] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A method for accurately placing charge on a blast furnace and adding center coking, characterized in that: The following steps are involved: Step 1: Analyze the utilization rate of blast furnace gas, and determine whether the fluctuation of gas utilization rate is abnormal based on the analysis result. If so, generate an abnormal signal; Step 2: Based on the abnormal signal, analyze the gas utilization rate fluctuation curve and the central coke amount curve to obtain the slope deviation ratio; analyze the slope deviation ratio to generate a correlation signal; Step 3: Based on the correlation signal, the material flow valve opening angle interval is divided, and the center focus amount within the material flow valve opening angle interval is analyzed to obtain the interval deviation value; Analyze the interval deviation value to obtain the optimal flow valve opening angle interval; Step 4: Evenly divide the optimal flow valve opening angle interval into the valve opening angle value; analyze the gas utilization rate of the valve opening angle value to obtain the over-limit quantity ratio; analyze the over-limit quantity ratio to obtain the first angle priority value and the second angle priority value; analyze the first angle priority value or the second angle priority value to obtain the optimal valve opening angle; Step 5: Adjust the valve opening angle of the distribution chute according to the optimal valve opening angle, and add central coke into the blast furnace for precise distribution.

2. The method for accurate center coking of blast furnace charge distribution according to claim 1, characterized in that: The interval deviation value is obtained as follows: The central coke quantity in the blast furnace is analyzed to obtain the excess deviation ratio PC and the excess deviation mean PE; The excess deviation ratio PC and the deviation excess mean PE are analyzed and the formula is used. The interval deviation value PL is obtained; wherein a1 and a2 are preset proportional coefficients.

3. The method for accurate center coking of blast furnace charge distribution according to claim 2, characterized in that: The excess deviation ratio is obtained as follows: Get the amount of coking at the center of the blast furnace when the burden chute in the blast furnace completes a single coking action; The center focus amount is processed with the standard center focus amount, and the absolute value of the difference is taken to obtain the center focus difference; the center focus difference is processed with the standard center focus amount to obtain the focus deviation ratio of the blast furnace center; The focus deviation ratio of the blast furnace center is compared with the focus deviation ratio threshold. If the focus deviation ratio of the blast furnace center is greater than or equal to the focus deviation ratio threshold, the corresponding focus deviation ratio of the blast furnace center is recorded as the excess deviation ratio, recorded as PC.

4. The method for accurately distributing charge to a blast furnace and adding center coking according to claim 2, characterized in that: The method for obtaining the excess mean of the deviation is: Count the number of excess deviation ratios, perform ratio processing on the excess deviation ratio and the total number of focus deviation ratios at the center of the blast furnace to obtain the focus deviation value; The excess deviation ratio is processed by difference with the focus deviation ratio threshold to obtain the deviation excess value of the focus deviation ratio corresponding to the blast furnace center; all the deviation excess values ​​are summed and averaged to obtain the deviation excess mean, which is recorded as PE.

5. The method for accurate center coking of blast furnace charge distribution according to claim 1, characterized in that: The method for obtaining the over-boundary quantity ratio is as follows: Compare the slope values ​​q1, q2, ..., qn of the gas utilization rate sub-curve with the slope threshold of the gas utilization rate sub-curve; if the slope value of the gas utilization rate sub-curve is greater than or equal to the slope threshold of the gas utilization rate sub-curve, record the corresponding slope value of the gas utilization rate sub-curve as an out-of-bounds slope value; The number of over-boundary slope values ​​is counted, and the number of over-boundary slope values ​​is ratioed to the total number of slope values ​​of the gas utilization rate sub-curve to obtain the over-boundary number ratio of the slope values ​​of the gas utilization rate sub-curve.

6. The method for accurate center coking of blast furnace charge distribution according to claim 1, characterized in that: The first angle priority value is obtained as follows: By analyzing the gas utilization rate fluctuation curve and the standard gas utilization rate straight line, the deviation area ratio MJ and the overlap length ratio CD are obtained; The deviation area ratio MJ and the overlap length ratio CD are processed and the formula is used. A first angle priority value AB is obtained, wherein b1 and b2 are preset proportional coefficients.

7. A method for accurately placing charge on a blast furnace and adding center coking according to claim 6, characterized in that: The deviation area ratio and the overlap length ratio are obtained as follows: The area enclosed by the gas utilization rate fluctuation curve and the standard gas utilization rate straight line is obtained, which is recorded as the first area; and the area enclosed by the standard gas utilization rate straight line and the X-axis, that is, the horizontal length of the standard gas utilization rate straight line, multiplied by the Y value of the standard gas utilization rate straight line, is recorded as the second area, and the first area and the second area are ratioed to obtain the deviation area ratio MJ; The length of the overlapped line segment between the gas utilization rate fluctuation curve and the standard gas utilization rate straight line is obtained, recorded as the overlapped length, and the overlapped length is ratioed to the total length of the standard gas utilization rate straight line to obtain the overlapped length ratio CD.

8. The method for accurate center coking of blast furnace charge distribution according to claim 1, characterized in that: The second angle priority value is obtained as follows: Analyze the gas utilization rate fluctuation curve and obtain the utilization rate fluctuation mean ratio JZ; Analyze the material distribution time required for different valve opening angles to obtain the material distribution time ratio ST; The utilization rate fluctuation mean ratio JZ and the material distribution time ratio ST are processed and the formula is used A second angle priority value XM is obtained, wherein c1 and c2 are preset proportional coefficients.

9. A method for accurate center coking of blast furnace charge distribution according to claim 8, characterized in that: The method for obtaining the utilization rate fluctuation mean ratio JZ and the material distribution time ratio ST is as follows: The peak value and trough value of the gas utilization rate fluctuation curve are respectively subtracted from the standard gas utilization rate and the absolute values ​​are taken to obtain the peak difference and the trough difference; all the peak differences and trough differences are summed and averaged to obtain the utilization rate fluctuation mean; the utilization rate fluctuation mean is processed by ratio processing with the utilization rate fluctuation mean threshold to obtain the utilization rate fluctuation mean ratio, which is recorded as JZ; Obtain the required material distribution time under the condition of the same amount of focus at different valve opening angles; The cloth-laying time is compared with the cloth-laying time threshold to obtain the cloth-laying time ratio, which is recorded as ST.

10. The method for accurate center coking of blast furnace charge distribution according to claim 1, characterized in that: The optimal valve opening angle is obtained in the following manner: Based on the generation of w over-boundary signals and 0 under-boundary signals, the first angle priority values ​​of all valve opening angle values ​​are compared, and the valve opening angle value with the largest first angle priority value is recorded as the optimal valve opening angle; Based on generating 0 out-of-bounds signals and w not-out-of-bounds signals, and the generated w signals include both out-of-bounds signals and not-out-of-bounds signals, the second angle priority values ​​of all valve opening angle values ​​are compared, and the valve opening angle value with the largest second angle priority value is recorded as the optimal valve opening angle.

Images