Regional aluminum oxide non-uniform blanking system and method for aluminum electrolysis cell

Abstract

The invention provides a regional aluminum oxide non-uniform blanking system and method for an aluminum electrolysis cell, and relates to the technical field of aluminum electrolysis in the metallurgical industry. The regional aluminum oxide non-uniform discharging system for the aluminum electrolysis cell comprises an anode current online monitoring module, a material blocking monitoring module, a cell control module and a discharging execution module, the discharging amount of each discharging region is adjusted according to the monitored anode current and material blocking conditions, two sets of discharging devices are used for discharging alternately, and the situation that adjacent discharging devices conduct discharging at the same time is avoided; according to the method, non-uniform blanking is achieved in the mode of changing the blanking times, the blanking times of each blanking device are jointly determined by the total anode current amount and the material blocking condition in the blanking area, the method does not need to set a blanking period for each blanking device, the method is simple and practical, and the blanking devices can be conveniently controlled by a cell control machine.

Description

Technical Field

[0001] The present invention relates to the technical field of aluminum electrolysis in the metallurgical industry, and more specifically to a system and method for non-uniformly discharging aluminum oxide in different regions of an aluminum electrolysis cell. Background Art

[0002] The traditional way of feeding alumina is to feed evenly in all areas. Although multiple feeders will be divided into two groups for alternating feeding, for example, a 500kA electrolytic cell with 6 feeders will feed alternately in groups 1, 3, and 5, and groups 2, 4, and 6, but the number of times of feeding by the 6 feeders is always the same. For large cells, this way of uniform feeding in space is no longer suitable for the actual situation. This is mainly because the demand for alumina in each feeding area is different. For example, for the feeding area with new poles, because the new poles are less conductive, the current in this area is less, and the corresponding aluminum produced is less, and the demand for alumina is also less, while the demand for alumina in other areas with more current is more. Another situation is that if the feeding port is blocked, even if the feeder feeds more materials, it cannot enter the electrolyte, which increases the difficulty of handling the blockage. When handling the blockage, it is easy for a large amount of alumina to enter the electrolyte in a short time and cannot be dissolved, thus forming the risk of precipitation. Therefore, the feeding port with blocked materials should be temporarily stopped and wait for manual processing to clear the blockage before feeding.

[0003] One way of non-uniform feeding is to set each feeder with its own feeding cycle. The disadvantage of this method is that each feeder has a feeding cycle, so adjacent feeders may feed at the same time. In extreme cases, all feeders may feed at the same time, which is obviously not conducive to the dissolution of alumina. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a system and method for non-uniform feeding of alumina in different regions of an aluminum electrolytic cell in view of the deficiencies of the above-mentioned prior art, aiming to solve the problem of simultaneous feeding of adjacent feeders.

[0005] In order to achieve the above object, the main technical solutions adopted by the present invention are:

[0006] On the one hand, the present invention provides a non-uniform feeding system of aluminum oxide in different regions of an aluminum electrolytic cell, the system comprising an anode current online monitoring module, a material blockage monitoring module, a cell control module, and a feeding execution module;

[0007] The anode current online monitoring module is used to monitor the total anode current of each unloading area in real time by measuring the voltage of the anode busbar, and transmit the monitoring data to the tank control module;

[0008] The blocking monitoring module is used to monitor the blocking situation of each feeding area by monitoring the voltage between the feeder and the electrolyte, and transmit the monitoring data to the tank control module;

[0009] The two ends of the tank control module are respectively connected to the anode current online monitoring module and the material blocking monitoring module, and are used to receive the monitoring data of the anode current online monitoring module and the material blocking monitoring module, calculate the number of material feeding in each material feeding area according to the monitoring data, generate a non-uniform material feeding instruction, and send the non-uniform material feeding instruction to the material feeding execution module;

[0010] The material feeding execution module includes n feeders for executing non-uniform material feeding instructions.

[0011] Furthermore, the slot control module dynamically adjusts the ratio of the number of material unloading of each unloader according to the number of material unloading base. The calculation formula of the number of material unloading base is as follows:

[0012] a=I×b

[0013] Among them, a is the base number of material unloading times; I is the average value of the total regional anode current over a period of time; b is the material blocking index, which is used to characterize the current material blocking state. The index is 0 when the material is blocked and 1 when the material is not blocked.

[0014] Furthermore, the cardinal numbers of the material unloading times of the n material unloading areas of the slot control module are respectively a 1 =I 1 ×b 1 、a 2 =I 2 ×b 2 、a 3 =I 3 ×b 3 , ..., a n =I n ×b n , from n number of material cuts base a n Find the largest number a i , i is a i The corresponding unloading area number, every set dynamic unloading interval time t, unloading area i is unloaded, for each ratio a i A small non-zero number a j , j is a j Corresponding cutting area number, find two mutually prime natural numbers k i-j and k j , so that Complete k in the cutting area i i-j During the first unloading period, unloading area j completes k in proportion. j The material is unloaded for the remaining times, and the material is stopped; when a j When it is equal to 0, the material cutting area No. j will be stopped.

[0015] Furthermore, when k j =k i-j -k j When k j >k i-j -k j When the feeder discharges m j Stop feeding once after times, m j Not greater than The largest integer; when k j <k i-j -k j When the feeder stops feeding m j 'After unloading once, m j ' is not greater than The maximum integer.

[0016] Furthermore, the dynamic unloading interval time t is equal to the traditional unloading interval time t 0 Multiply by the coefficient k, the traditional feeding interval time t 0 To assume that all cutting areas are cut evenly, the coefficient k is calculated as follows:

[0017]

[0018] On the other hand, a method for non-uniformly discharging aluminum oxide in different regions of an aluminum electrolysis cell using the system for non-uniformly discharging aluminum oxide in different regions of an aluminum electrolysis cell comprises the following steps:

[0019] Step 1: measure the voltage of the anode busbar in real time through the anode current online monitoring module, obtain the total anode current of each unloading area, and transmit the monitoring data to the tank control module;

[0020] Step 2: Monitor the voltage change between each feeder and the electrolyte through the blocking monitoring module, determine whether there is blocking, generate a blocking index, and transmit the monitoring data to the tank control module;

[0021] Step 3: The tank control module calculates the number of material unloading times in each unloading area according to the total anode current and the material blocking index. The calculation formula of the number of material unloading times is as follows:

[0022] a=I×b

[0023] Among them, a is the base number of material unloading times; I is the average value of the total anode current in the region over a period of time; b is the material blocking index, which is used to characterize the current material blocking state. When the material is blocked, the index is 0, and when the material is not blocked, the index is 1;

[0024] Step 4: Select the maximum value from all the material unloading times as the benchmark, and calculate the dynamic unloading interval time;

[0025] Step 5: Find the coprime natural number k based on the benchmark i-j and k j , distribute the proportion of feeding times through mutually prime natural numbers and generate non-uniform feeding instructions;

[0026] Step 6: According to the coprime natural number k i-j and k j Adjust the dynamic unloading interval time;

[0027] Step 7: The slot control module sends the generated non-uniform feeding instruction to the feeding execution module, and the feeding execution module controls each feeder to perform feeding or stopping operation in proportion.

[0028] The present invention has the following beneficial effects and advantages:

[0029] The present invention alternately discharges materials by two groups of feeders to avoid simultaneous discharge of materials by adjacent feeders; non-uniform discharge is achieved by changing the number of discharges, and the number of discharges of each feeder is determined by the total amount of anode current and the blockage situation in the discharge area. This method does not require a discharge cycle to be set for each feeder, is simple and practical, and is convenient for the slot control machine to control the feeder. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a structural diagram of the non-uniform alumina feeding system in different areas of the aluminum electrolytic cell.

[0031] In the figure: 1. Aluminum electrolytic cell; 2. Anode current online monitoring module; 3. Blockage monitoring module; 4. Feeder; 5. Feeding area; 6. Cell control module. DETAILED DESCRIPTION

[0032] The present invention will be further described below in conjunction with the accompanying drawings.

[0033] Figure 1 : is a structural diagram of the non-uniform feeding system of aluminum oxide in different regions of the aluminum electrolytic cell according to the present embodiment, as shown in FIG. Figure 1 As shown, on the one hand, this embodiment provides a non-uniform alumina feeding system for aluminum electrolytic cells in different areas, including an anode current online monitoring module, a blockage monitoring module, a cell control module, and a feeding execution module. Personnel skilled in the art optimize and improve the number and sequence of feeding of each feeder according to demand. The alumina feeding demand of each feeding area is determined based on the total anode current and the blockage situation in the area, and the alumina feeding demand is achieved by changing the ratio of the feeding times.

[0034] The anode current online monitoring module is used to monitor the total anode current of each unloading area in real time by measuring the voltage of the anode busbar, and transmit the monitoring data to the tank control module;

[0035] The blocking monitoring module is used to monitor the blocking situation of each feeding area by monitoring the voltage between the feeder and the electrolyte, and transmit the monitoring data to the tank control module;

[0036] The two ends of the tank control module are respectively connected to the anode current online monitoring module and the material blocking monitoring module, and are used to receive the monitoring data of the anode current online monitoring module and the material blocking monitoring module, calculate the number of material feeding in each material feeding area according to the monitoring data, generate a non-uniform material feeding instruction, and send the non-uniform material feeding instruction to the material feeding execution module;

[0037] The material discharging execution module comprises n material discharging devices for executing non-uniform material discharging instructions;

[0038] A blocking index b is used to represent the current blocking state of each feeding area. The index is 0 when the material is blocked and 1 when the material is not blocked. The product of the blocking index b and the average value of the total anode current of the area over a period of time I is used as the cardinality of the feeding times of the area. The cardinality of the feeding times of the n feeding areas is a 1 =I 1 ×b 1 、a 2 =I 2 ×b 2 、a 3 =I 3 ×b 3 , ..., a n =I n ×b n .

[0039] From n unloading times base a n Find the largest number a i , i is a i The corresponding unloading area number, every set dynamic unloading interval time t, unloading area i is unloaded, for each ratio a i A small non-zero number a j , j is a j Corresponding cutting area number, find two mutually prime natural numbers k i-j and k j , so that Complete k in the cutting area i i-j During the first unloading period, unloading area j completes k in proportion. j The material is unloaded for the remaining times, and the material is stopped; when a j When it is equal to 0, the material cutting area No. j will be stopped.

[0040] When k j =k i-j -k j When k j >ki-j -k j When the feeder discharges m j Stop feeding once after times, m j Not greater than The largest integer; when k j <k i-j -k j When the feeder stops feeding m j 'After unloading once, m j ' is not greater than The maximum integer.

[0041] The dynamic unloading interval time t is equal to the traditional unloading interval time t 0 Multiply by the coefficient k, the traditional feeding interval time t 0 To assume that all cutting areas are cut evenly, the coefficient k is calculated as follows:

[0042]

[0043] On the other hand, a method for non-uniform feeding of aluminum oxide in different regions of an aluminum reduction cell using the system for non-uniform feeding of aluminum oxide in different regions of an aluminum reduction cell according to claim 1 comprises the following steps:

[0044] Step 1: measure the voltage of the anode busbar in real time through the anode current online monitoring module, obtain the total anode current of each unloading area, and transmit the monitoring data to the tank control module;

[0045] Step 2: Monitor the voltage change between each feeder and the electrolyte through the blocking monitoring module, determine whether there is blocking, generate a blocking index, and transmit the monitoring data to the tank control module;

[0046] Step 3: The tank control module calculates the number of material unloading times in each unloading area according to the total anode current and the material blocking index. The calculation formula of the number of material unloading times is as follows:

[0047] a=I×b

[0048] Among them, a is the base number of material unloading times; I is the average value of the total anode current in the region over a period of time; b is the material blocking index, which is used to characterize the current material blocking state. When the material is blocked, the index is 0, and when the material is not blocked, the index is 1;

[0049] Step 4: Select the maximum value from all the material unloading times as the benchmark, and calculate the dynamic unloading interval time;

[0050] Step 5: Find the coprime natural number k based on the benchmark i-j and k j , distribute the proportion of feeding times through mutually prime natural numbers and generate non-uniform feeding instructions;

[0051] Step 6: According to the coprime natural number k i-j and k j Adjust the dynamic unloading interval time;

[0052] Step 7: The slot control module sends the generated non-uniform feeding instruction to the feeding execution module, and the feeding execution module controls each feeder to perform feeding or stopping operation in proportion.

[0053] Embodiment 1:

[0054] A 500kA electrolytic cell has 6 unloading areas, and the unloading is done alternately in the order of 1, 3, 5 and 2, 4, 6.

[0055] The anode current monitoring equipment was used to obtain the average total anode current of the six unloading areas within six hours, which were 80,000, 90,000, 78,000, 76,000, 92,000, and 84,000 A. The blockage monitoring equipment was used to obtain the information that there was no blockage in the six unloading areas.

[0056] The cardinality of the material unloading times in the 6 unloading areas is respectively a 1 =80000, a 2 =90000, a 3 =78000, a 4 =76000, a 5 =92000 and a 6 =84000.

[0057] The largest number of material cutting bases is in the No. 5 material cutting area, a 5 =92000.

[0058] For the No. 1 cutting area, find the natural numbers 20 and 23 that have no common divisor. When the No. 5 cutting area cuts 23 times, the No. 1 cutting area cuts 20 times. 6 is not greater than The maximum integer of . The No. 1 unloading area stops every 6 unloadings until 20 unloadings are completed, and then the cycle repeats.

[0059] For the No. 2 cutting area, find the natural numbers 45 and 46 that have no common divisor. When the No. 5 cutting area cuts 46 times, the No. 2 cutting area cuts 45 times. 45 is not greater than The maximum integer of . The No. 2 unloading area stops every 45 unloadings and then repeats the cycle.

[0060] For the No. 3 cutting area, find the natural numbers 39 and 46 that have no common divisor. When the No. 5 cutting area cuts 46 times, the No. 3 cutting area cuts 39 times. 5 is not greater than The maximum integer of . The feeding area No. 3 stops every 5 feedings until 39 feedings are completed, and then the cycle repeats.

[0061] For the No. 4 cutting area, find the natural numbers 19 and 23 that have no common divisor. When the No. 5 cutting area cuts 23 times, the No. 4 cutting area cuts 19 times. 4 is not greater than The maximum integer of . The No. 4 unloading area stops every 4 unloadings until 19 unloadings are completed, and then the cycle repeats.

[0062] The material unloading in the No. 5 unloading area is ongoing without stopping.

[0063] For the No. 6 cutting area, find the natural numbers 21 and 23 that have no common divisor. When the No. 5 cutting area cuts 23 times, the No. 4 cutting area cuts 21 times. 10 is not greater than The maximum integer of . The feeding area No. 6 stops every 10 feedings until 21 feedings are completed, and then the cycle repeats.

[0064] Assuming that all cutting areas are cut evenly, the cutting interval t 0 The calculation formula for the set unloading interval time t is as follows:

[0065]

[0066] Embodiment 2:

[0067] A 300kA electrolytic cell has 4 unloading areas, and the unloading is carried out in an alternating manner of 1, 3 and 2, 4.

[0068] The anode current monitoring equipment was used to find out that the average total anode current of the four unloading areas within 6 hours was 72000, 75000, 78000, and 75000 A. The blockage monitoring equipment was used to find out that there was blockage in the No. 1 unloading area, and there was no blockage in the other three unloading areas.

[0069] The base numbers of material unloading times in the four unloading areas are respectively a 1 =0, a 2 =75000, a 3 =78000, a 4 =75000.

[0070] The largest number of material cutting bases is in the No. 5 material cutting area, a 3 =78000.

[0071] For the No. 1 unloading area, due to the blockage, a 1 =0, so material feeding is always stopped.

[0072] For the No. 2 cutting area, find the natural numbers 25 and 26 that have no common divisor. When the No. 3 cutting area cuts 26 times, the No. 2 cutting area cuts 25 times. 25 is not greater than The maximum integer of . The No. 2 unloading area stops every 25 unloadings and then repeats the cycle.

[0073] The material unloading in the No. 3 unloading area is ongoing without stopping.

[0074] The unloading method in unloading area No. 4 is the same as that in unloading area No. 2.

[0075] Assuming that all cutting areas are cut evenly, the cutting interval t 0 The calculation formula for the set unloading interval time t is as follows:

[0076]

[0077] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A non-uniform feeding system for aluminum electrolysis cells with different regions of aluminum oxide, characterized in that: The system includes an anode current online monitoring module, a material blockage monitoring module, a tank control module, and a material unloading execution module; The anode current online monitoring module is used to monitor the total anode current of each unloading area in real time by measuring the voltage of the anode busbar, and transmit the monitoring data to the tank control module; The blocking monitoring module is used to monitor the blocking situation of each feeding area by monitoring the voltage between the feeder and the electrolyte, and transmit the monitoring data to the tank control module; The two ends of the tank control module are respectively connected to the anode current online monitoring module and the material blocking monitoring module, and are used to receive the monitoring data of the anode current online monitoring module and the material blocking monitoring module, calculate the number of material feeding in each material feeding area according to the monitoring data, generate a non-uniform material feeding instruction, and send the non-uniform material feeding instruction to the material feeding execution module; The material feeding execution module includes n feeders for executing non-uniform material feeding instructions.

2. The system for non-uniform feeding of aluminum oxide in different regions of an aluminum electrolysis cell according to claim 1, characterized in that: The slot control module dynamically adjusts the ratio of the number of material unloading of each unloader according to the number of material unloading base. The calculation formula of the number of material unloading base is as follows: a=I×b Among them, a is the base number of material unloading times; I is the average value of the total regional anode current over a period of time; b is the material blocking index, which is used to characterize the current material blocking state. The index is 0 when the material is blocked and 1 when the material is not blocked.

3. The system for non-uniform feeding of aluminum oxide in different regions of an aluminum electrolysis cell according to claim 2, characterized in that: The cardinal numbers of material unloading times of the n unloading areas of the slot control module are respectively a1=I1×b1, a2=I2×b2, a3=I3×b3, ..., a n =I n ×b n , from n number of material cuts cardinality a n Find the largest number a i , i is a i The corresponding unloading area number, every set dynamic unloading interval time t, unloading area i is unloaded, for each ratio a i A small non-zero number a j , j is a j Corresponding cutting area number, find two mutually prime natural numbers k i-j and k j , so that Complete k in the cutting area i i-j During the first unloading period, unloading area j completes k in proportion. j The material is unloaded for the remaining times, and the material is stopped; when a j When it is equal to 0, the material cutting area No. j will be stopped.

4. The system for non-uniform feeding of aluminum oxide in different regions of an aluminum electrolysis cell according to claim 3, characterized in that: When k j =k i-j -k j When k j >k i-j -k j When the feeder discharges m j Stop feeding once after times, m j Not greater than The largest integer; when k j <k i-j -k j When the feeder stops feeding m j 'After unloading once, m j ' is not greater than The maximum integer.

5. The system for non-uniform feeding of aluminum oxide in different regions of an aluminum electrolysis cell according to claim 3, characterized in that: The dynamic unloading interval time t is equal to the traditional unloading interval time t0 multiplied by the coefficient k. The traditional unloading interval time t0 is the unloading interval when all unloading areas are assumed to be unloaded evenly. The calculation formula of the coefficient k is as follows:

6. A method for non-uniform feeding of aluminum oxide in different regions of an aluminum reduction cell using the non-uniform feeding system for non-uniform feeding of aluminum oxide in different regions of an aluminum reduction cell according to claim 1, characterized in that: The following steps are involved: Step 1: measure the voltage of the anode busbar in real time through the anode current online monitoring module, obtain the total anode current of each unloading area, and transmit the monitoring data to the tank control module; Step 2: Monitor the voltage change between each feeder and the electrolyte through the blocking monitoring module, determine whether there is blocking, generate a blocking index, and transmit the monitoring data to the tank control module; Step 3: The tank control module calculates the number of material unloading times in each unloading area according to the total anode current and the material blocking index. The calculation formula of the number of material unloading times is as follows: a=I×b Among them, a is the base number of material unloading times; I is the average value of the total anode current in the region over a period of time; b is the material blocking index, which is used to characterize the current material blocking state. When the material is blocked, the index is 0, and when the material is not blocked, the index is 1; Step 4: Select the maximum value from all the material unloading times as the benchmark, and calculate the dynamic unloading interval time; Step 5: Find the coprime natural number k based on the benchmark i-j and k j , distribute the proportion of feeding times through mutually prime natural numbers and generate non-uniform feeding instructions; Step 6: According to the coprime natural number k i-j and k j Adjust the dynamic unloading interval time; Step 7: The slot control module sends the generated non-uniform feeding instruction to the feeding execution module, and the feeding execution module controls each feeder to perform feeding or stopping operation in proportion.

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