CN110413938B - Method for calculating aluminum outlet task of aluminum electrolysis cell - Google Patents
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Abstract
The method for calculating the aluminum production task of the aluminum electrolysis cell changes the experience method of the aluminum production task in the conventional aluminum electrolysis production, combines historical multi-factor data, calculates the aluminum production task by applying a scientific calculation model algorithm, finally forms a calculation mathematical model, is solidified in a computer, can quickly and accurately issue the aluminum production task of the aluminum electrolysis cell, reduces the manual metering time, more scientifically guides the aluminum production adjustment of the aluminum electrolysis cell, reduces the influence of thermal balance change caused by the fluctuation of the aluminum level, and reduces the artificial interference fluctuation.
Description
Technical Field
The invention belongs to the technical field of electrolytic aluminum, and relates to a method for calculating an aluminum outlet task of an aluminum electrolytic cell.
Background
The aluminum level is an important technical condition parameter in aluminum electrolysis production, in most electrolytic aluminum plants, the assignment of aluminum discharge tasks every day is mostly issued by referring to the measurement data of the aluminum level, the management experience is dominant, and even under the same management thought and the same aluminum level condition, different managers have the possibility of generating deviation on the aluminum discharge tasks assigned by the same electrolytic cell, and the aluminum discharge tasks are difficult to be unified.
Aluminum production is required every day in the daily production of electrolytic cells, so that the stability of the aluminum level plays a crucial role in the thermal balance of the electrolytic cell, which requires that the aluminum level fluctuates within a small range, and effective control is achieved to reduce interference of human factors.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a method for calculating an aluminum tapping task of an aluminum electrolysis cell, which can scientifically guide the adjustment of the aluminum tapping task, reduce the interference of human factors and promote the stability of the heat balance of the aluminum electrolysis cell.
The invention provides a method for calculating an aluminum outlet task of an aluminum electrolytic cell, which comprises the following steps:
step 1: calculating an aluminum level reference value according to the aluminum level 7 days before aluminum discharge;
and 2, step: calculating a difference compensation value of the aluminum level on the day according to the aluminum level reference value and the aluminum level set target value;
and step 3: calculating an aluminum efficiency reference calculation value according to the average value of the current efficiency of 3 months before aluminum is produced, and further calculating a theoretical value of an aluminum task;
and 4, step 4: calculating a blanking amount compensation value of an aluminum task according to the average value of the blanking amounts and the blanking amount of the day before aluminum discharging;
and 5: calculating an under-over ratio compensation value of the aluminum task according to the average value of the under-over ratio and the under-over ratio of the day before aluminum production;
step 6: correcting the theoretical value of the aluminum tapping task by combining the blanking amount compensation value and the under-over ratio compensation value to obtain the corrected theoretical value of the aluminum tapping task;
and 7: calculating the aluminum tapping task in the same day by combining the difference compensation value of the aluminum level in the same day, the theoretical value of the aluminum tapping task and the theoretical value of the corrected aluminum tapping task;
and 8: when the calculated current aluminum tapping task is larger than the set upper limit value, the actual aluminum tapping task takes the upper limit value; when the calculated current aluminum tapping task is smaller than the set lower limit value, the actual aluminum tapping task takes the lower limit value; and when the current aluminum tapping task is between the lower limit value and the upper limit value, the actual aluminum tapping task is the calculated current aluminum tapping task.
In the method for calculating the aluminum outlet task of the aluminum electrolytic cell, the step 1 specifically comprises the following steps:
step 1.1: the aluminum level 7 days before the day of aluminum production is set as H 1 ～H 7 Calculating a moving average every 3 days;
step 1.2: and calculating an aluminum level reference value according to the moving average value and the corresponding weight.
In the method for calculating the aluminum tapping task of the aluminum electrolytic cell, the moving average value is calculated according to the following formula in step 1.1:
wherein, a 1 、a 2 、a 3 、a 4 、a 5 Respectively, the moving average values calculated every 3 days.
In the method for calculating the aluminum discharging task of the aluminum electrolytic cell, the aluminum level reference value is calculated according to the following formula in step 1.2:
H sta ＝b 1 ×a 1 +b 2 ×a 2 +b 3 ×a 3 +b 4 ×a 4 +b 5 ×a 5
wherein, b 1 +b 2 +b 3 +b 4 +b 5 ＝1，b 1 、b 2 、b 3 、b 4 、b 5 Are weights respectively corresponding to the corresponding moving averages, H sta Is an aluminum level reference value.
In the method for calculating the aluminum tapping task of the aluminum electrolytic cell, the step 2 calculates the difference compensation value of the current aluminum level according to the following formula:
wherein H sta Is a reference value of the aluminum level in cm; h tar Setting a target value for the aluminum level in cm; w unit Is the weight of the aluminum water in unit kg; n is the number of compensating days, q 0 A weight coefficient is calculated for the first.
In the method for calculating the aluminum tapping task of the aluminum electrolysis cell, the step 3 is specifically as follows:
step 3.1: taking the average value of the current efficiency 3 months before the previous day of aluminum as the standard calculation value of the aluminum efficiency;
in step 3.2, the theoretical value of the aluminum task is calculated according to the following formula:
S 1 ＝CE sta ×I×0.3355×24
wherein, CE sta And I is actual current of system operation in kA.
In the method for calculating the aluminum tapping task of the aluminum electrolysis cell, the step 4 specifically comprises the following steps:
step 4.1: calculating the average blanking amount of 3 months before the previous day of aluminum;
step 4.2: calculating a feed compensation value M according to the following formula:
M＝M a -M sta
wherein, M sta The average value of the blanking amount of 3 months before the day before aluminum tapping is carried out, and the unit kg is obtained; m a The unit kg is the blanking amount of the day before aluminum discharging.
In the method for calculating the aluminum tapping task of the aluminum electrolysis cell, the step 5 specifically comprises the following steps:
step 5.1: calculating the average value of the underrun-to-overage ratio of 3 months before the previous day of aluminum;
and step 5.2: the under-over compensation value R is calculated according to the following formula:
R＝R a -R sta
wherein R is sta The average value of the underrun ratio of 3 months before the day before aluminum production is obtained; r is a The shortage ratio of the day before aluminum tapping is obtained.
In the method for calculating the aluminum tapping task of the aluminum reduction cell of the present invention, in the step 6, the theoretical value S of the corrected aluminum tapping task is calculated according to the following formula 2 ：
S 2 ＝(M-R×100)×q 1
Wherein M is the blanking amount compensation value of the aluminum tapping task, R is the over-deficiency compensation value of the aluminum tapping task, q is the over-deficiency compensation value of the aluminum tapping task 1 A weight coefficient is calculated for the second.
In the method for calculating the aluminum tapping task of the aluminum electrolytic cell, the aluminum tapping task S in the day is calculated in the step 7 according to the following formula:
wherein N is a rounding coefficient, and the value of N is 20, 30, 40 and 50.
The method for calculating the aluminum tapping task of the aluminum electrolytic cell can quickly calculate the aluminum tapping task of the electrolytic cell on the same day, and a scientific calculation method can replace the original experience management, ensure the fluctuation of the aluminum level, reduce the fluctuation of the thermal balance caused by the change of the aluminum level, provide effective help for the scientific optimization and adjustment of the electrolytic cell, maintain good cell conditions and reduce the artificial interference fluctuation.
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FIG. 1 is a flow chart of a calculation method of an aluminum tapping task of an aluminum electrolysis cell of the present invention.
Detailed Description
The method for calculating the aluminum tapping task of the aluminum electrolytic cell changes the experience method of the aluminum tapping task in the conventional electrolytic aluminum production, combines historical multi-factor data, calculates the aluminum tapping task by applying a scientific calculation model algorithm, finally forms a calculation mathematical model, is solidified in a computer, and can quickly and accurately issue the aluminum tapping task of the electrolytic cell. The calculation model uses a plurality of technical condition data of daily production of the electrolytic cell, wherein the technical condition data comprise aluminum level, blanking amount, shortage ratio and the like.
As shown in FIG. 1, the method for calculating the aluminum tapping task of the aluminum electrolysis cell comprises the following steps:
step 1: calculating an aluminum level reference value according to the aluminum level 7 days before aluminum discharge;
in specific implementation, the aluminum level data of the first 7 days of the current aluminum task is calculated, the moving average value of the data is calculated, and the weighted average value of the aluminum levels is calculated according to the weight proportion and is used as the aluminum level reference.
The step 1 specifically comprises the following steps:
step 1.1: the aluminum level 7 days before the aluminum comes out of the day is set as H 1 ～H 7 The moving average is calculated every 3 days, specifically according to the following formula:
wherein, a 1 、a 2 、a 3 、a 4 、a 5 Respectively, the moving average values calculated every 3 days.
Step 1.2: calculating an aluminum level reference value according to the moving average value and the corresponding weight, specifically according to the following formula:
H sta ＝b 1 ×a 1 +b 2 ×a 2 +b 3 ×a 3 +b 4 ×a 4 +b 5 ×a 5
wherein, b 1 +b 2 +b 3 +b 4 +b 5 ＝1，b 1 、b 2 、b 3 、b 4 、b 5 Are weights respectively corresponding to the corresponding moving averages, H sta Is an aluminum level reference value.
And 2, step: calculating a difference compensation value of the aluminum level on the day according to the aluminum level reference value and the aluminum level set target value;
in specific implementation, the aluminum discharging task is adjusted according to the set target value of the aluminum level, the difference between the reference value of the aluminum level and the set target value of the aluminum level is calculated, average compensation is carried out according to a certain number of days, and specifically, the compensation value of the difference of the aluminum level on the day is calculated according to the following formula:
wherein H sta Is the reference value of the aluminum level in cm; h tar Setting a target value for the aluminum level in cm; w unit Is the weight of the aluminum water in unit kg; n = 3-7 for the number of compensation days, q 0 Q is equal to or greater than 0.6 for the first calculation of the weight coefficient 0 ≤1。
And step 3: calculating an aluminum efficiency reference calculation value according to the average value of the current efficiency 3 months before aluminum is produced, and further calculating a theoretical value of an aluminum task;
in specific implementation, the average value of the aluminum discharging efficiency of 3 months before the day before the aluminum discharging tank is taken as the reference aluminum discharging efficiency of the electrolytic tank, and the aluminum discharging task is compensated according to the efficiency.
The step 3 specifically comprises the following steps:
step 3.1: taking the average value of the current efficiency of 3 months before the previous day of aluminum as the reference calculated value of the aluminum efficiency;
in step 3.2, the theoretical value of the aluminum task is calculated according to the following formula:
S 1 ＝CE sta ×I×0.3355×24
wherein, CE sta And I is actual current of system operation in kA.
And 4, step 4: calculating a blanking amount compensation value of an aluminum task according to the average value of the blanking amounts and the blanking amount of the day before aluminum discharging;
in specific implementation, in addition to important parameters such as aluminum level, current efficiency and the like, the data of blanking amount and over-and-under ratio are also included, and an aluminum discharging task is corrected according to a certain calculation method.
The step 4 specifically comprises the following steps:
step 4.1: calculating the average blanking amount of 3 months before the previous day of aluminum;
step 4.2: calculating a feed compensation value M according to the following formula:
M＝M a -M sta
wherein, M sta The average value of the blanking amount of 3 months before the day before aluminum tapping is carried out, and the unit kg is obtained; m a The unit kg is the blanking amount of the day before aluminum discharging.
And 5: calculating an under-over ratio compensation value of the aluminum task according to the average under-over ratio value and the under-over ratio of the day before aluminum production, wherein the step 5 specifically comprises the following steps:
step 5.1: calculating the average value of the over-shortage ratio of 3 months before the previous day of aluminum;
and step 5.2: the under-over compensation value R is calculated according to the following formula:
R＝R a -R sta
wherein R is sta The average value of the over-deficiency ratio of 3 months before the day before aluminum production; r a The shortage ratio of the day before aluminum discharge is obtained.
Step 6: correcting the theoretical value of the aluminum tapping task by combining the blanking amount compensation value and the over-shortage compensation value to obtain the corrected theoretical value of the aluminum tapping task, and calculating the corrected theoretical value S of the aluminum tapping task according to the following formula in the step 6 2 ：
S 2 ＝(M-R×100)×q 1
Wherein M is the blanking amount compensation value of the aluminum tapping task, R is the over-deficiency compensation value of the aluminum tapping task, q is the over-deficiency compensation value of the aluminum tapping task 1 Q is more than or equal to 0.8 for the second calculation of the weight coefficient 1 ≤1。
And 7: calculating the current aluminum tapping task by combining the difference compensation value of the current aluminum level, the theoretical value of the aluminum tapping task and the corrected theoretical value of the aluminum tapping task, wherein the current aluminum tapping task S is calculated in the step 7 according to the following formula:
wherein N is a rounding coefficient, and the values of N are 20, 30, 40 and 50.
And 8: when the calculated current aluminum tapping task is larger than the set upper limit value, the actual aluminum tapping task takes the upper limit value; when the calculated current aluminum tapping task is smaller than the set lower limit value, the actual aluminum tapping task takes the lower limit value; and when the current aluminum tapping task is between the lower limit value and the upper limit value, the actual aluminum tapping task is the calculated current aluminum tapping task.
The method changes the experience method of the aluminum production task in the conventional electrolytic aluminum production, combines historical multi-factor data, applies a scientific calculation model algorithm to calculate the aluminum production task, finally forms a calculation mathematical model, is solidified in a computer, can rapidly and accurately issue the aluminum production task of the electrolytic cell, reduces the manual metering time, more scientifically guides the aluminum production adjustment of the electrolytic cell, reduces the influence of thermal balance change caused by aluminum level fluctuation, and reduces artificial interference fluctuation. The method sets the upper limit and the lower limit of the aluminum outlet task, the adjustment amount of the aluminum outlet task cannot exceed the upper limit of the aluminum outlet task and cannot be lower than the lower limit of the aluminum outlet task, and the method can modify the aluminum outlet task on a computer in real time and perform related adjustment on the aluminum outlet task.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, which is defined by the appended claims.
Claims (10)
1. A method for calculating an aluminum outlet task of an aluminum electrolytic cell is characterized by comprising the following steps:
step 1: calculating an aluminum level reference value according to the aluminum level 7 days before aluminum discharge;
and 2, step: calculating a difference compensation value of the aluminum level on the day according to the aluminum level reference value and the aluminum level set target value;
and step 3: calculating an aluminum efficiency reference calculation value according to the average value of the current efficiency of 3 months before aluminum is produced, and further calculating a theoretical value of an aluminum task;
and 4, step 4: calculating a blanking amount compensation value of an aluminum task according to the average value of the blanking amounts and the blanking amount of the day before aluminum discharging;
and 5: calculating an under-over ratio compensation value of the aluminum task according to the average value of the under-over ratio and the under-over ratio of the day before aluminum production;
step 6: correcting the theoretical value of the aluminum tapping task by combining the blanking amount compensation value and the over-shortage compensation value to obtain the corrected theoretical value of the aluminum tapping task;
and 7: calculating the aluminum tapping task in the same day by combining the difference compensation value of the aluminum level in the same day, the theoretical value of the aluminum tapping task and the theoretical value of the corrected aluminum tapping task;
and 8: when the calculated day aluminum tapping task is larger than the set upper limit value, the actual aluminum tapping task takes the upper limit value; when the calculated current aluminum tapping task is smaller than the set lower limit value, the actual aluminum tapping task takes the lower limit value; and when the current aluminum tapping task is between the lower limit value and the upper limit value, the actual aluminum tapping task is the calculated current aluminum tapping task.
2. The method for calculating the aluminum tapping task of the aluminum electrolytic cell according to claim 1, wherein the step 1 specifically comprises the following steps:
step 1.1: the aluminum level 7 days before the aluminum comes out of the day is set as H 1 ～H 7 Calculating a moving average every 3 days;
step 1.2: and calculating an aluminum level reference value according to the moving average value and the corresponding weight.
3. The method for calculating the aluminum tapping task of the aluminum reduction cell according to claim 2, wherein the moving average value is calculated in step 1.1 according to the following formula:
wherein, a 1 、a 2 、a 3 、a 4 、a 5 Respectively, the moving average values calculated every 3 days.
4. A method for calculating an aluminum tapping task for an aluminum reduction cell according to claim 3, wherein in step 1.2, the aluminum level reference value is calculated according to the following formula:
H sta ＝b 1 ×a 1 +b 2 ×a 2 +b 3 ×a 3 +b 4 ×a 4 +b 5 ×a 5
wherein, b 1 +b 2 +b 3 +b 4 +b 5 ＝1，b 1 、b 2 、b 3 、b 4 、b 5 Are weights respectively corresponding to the corresponding moving averages, H sta Is the aluminum level reference value.
5. The method for calculating the aluminum tapping task of the aluminum reduction cell according to claim 4, wherein the step 2 calculates the difference compensation value of the aluminum level on the day according to the following formula:
wherein H sta Is the reference value of the aluminum level in cm; h tar Setting a target value for the aluminum level in cm; w unit Is the weight of the aluminum water in unit kg; n is the number of compensating days, q 0 A weight coefficient is calculated for the first.
6. The method for calculating the aluminum tapping task of the aluminum electrolytic cell according to claim 5, wherein the step 3 specifically comprises:
step 3.1: taking the average value of the current efficiency of 3 months before the previous day of aluminum as the reference calculated value of the aluminum efficiency;
in step 3.2, the theoretical value of the aluminum task is calculated according to the following formula:
S 1 ＝CE sta ×I×0.3355×24
wherein, CE sta And I is actual current of system operation in kA.
7. The method for calculating the aluminum tapping task of the aluminum electrolytic cell according to claim 6, wherein the step 4 specifically comprises:
step 4.1: calculating the average blanking amount of 3 months before the previous day of aluminum production;
step 4.2: calculating a blanking amount compensation value M according to the following formula:
M＝M a -M sta
wherein M is sta The average value of the blanking amount of 3 months before the day before aluminum tapping is carried out, and the unit kg is obtained; m a The unit kg is the blanking amount of the day before aluminum discharging.
8. The method for calculating the aluminum tapping task of the aluminum electrolytic cell according to claim 7, wherein the step 5 specifically comprises:
step 5.1: calculating the average value of the over-shortage ratio of 3 months before the previous day of aluminum;
step 5.2: the under-over compensation value R is calculated according to the following formula:
R＝R a -R sta
wherein R is sta The average value of the underrun ratio of 3 months before the day before aluminum production is obtained; r a The shortage ratio of the day before aluminum tapping is obtained.
9. The method for calculating the aluminum tapping task of the aluminum reduction cell according to claim 8, wherein the theoretical value S of the corrected aluminum tapping task is calculated in the step 6 according to the following formula 2 ：
S 2 ＝(M-R×100)×q 1
Wherein M is the blanking amount compensation value of the aluminum tapping task, R is the over-deficiency compensation value of the aluminum tapping task, q is the over-deficiency compensation value of the aluminum tapping task 1 A weight coefficient is calculated for the second.
10. The method for calculating the aluminum tapping assignment of the aluminum reduction cell according to claim 9, wherein the aluminum tapping assignment S in the current day is calculated in the step 7 according to the following formula:
wherein N is a rounding coefficient, and the value of N is 20, 30, 40 and 50.
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