Intelligent control method for current balance distributor in glass melting furnace

Abstract

The invention relates to a glass melting furnace production control technology, which is used to solve the problem that when the output branch current is unbalanced and is not discovered in time, it will cause adverse effects on the glass production quality and kiln equipment. Specifically, it is an intelligent control method applied to a glass melting furnace current balance distributor, including a control component; the invention realizes current balance by reasonably distributing the current of three parallel electrodes, avoiding the adverse effects of bias current on refractory materials and glass production, and detects the current values ​​of three output circuits through a current monitoring module to determine whether the current is unbalanced and whether the current imbalance is caused by winding changes. If the current imbalance is caused by the winding, the winding is restored to its initial state; if it is not caused by the winding, the current balance of the three output branches is quickly restored through resistance or winding adjustment; then the loss of the iron core is estimated, and measures are taken in advance for maintenance and adjustment to avoid the occurrence of current imbalance problems caused by iron core loss.

Description

Technical Field

[0001] The invention relates to a glass melting furnace production control technology, and in particular to an intelligent control method applied to a current balance distributor of a glass melting furnace. Background Art

[0002] Molten glass contains alkali metal sodium and potassium ions, which have conductive properties. When current passes through, it will generate Joule heat. If the heat is large enough, it can be used to melt glass. This is called "glass electric melting".

[0003] In the prior art, during the production process of a large all-electric glass furnace, if the current imbalance of the output branch is not discovered in time, it will affect the quality of glass production, causing uneven glass composition and increased defects in the produced glass; it will also affect the furnace equipment, causing increased electrode loss, damage to the furnace lining, and electrical equipment failure; stopping production to adjust the current balance will lead to reduced production efficiency, reduced thermal efficiency of the furnace, and increased energy consumption;

[0004] In view of the above technical problems, this application proposes a solution. Summary of the invention

[0005] The purpose of the present invention is to achieve current balance by reasonably distributing the current of three parallel electrodes, avoiding the adverse effects of bias current on refractory materials and glass production, and detecting the current values ​​of the three output circuits through a current monitoring module to determine whether the current is unbalanced and whether the current imbalance is caused by winding changes. If the current imbalance is caused by the winding, the winding is restored to its initial state; if it is not caused by the winding, the current balance of the three output branches is quickly restored through resistance or winding adjustment; then the loss of the iron core is estimated, and measures are taken in advance for maintenance and adjustment to avoid the occurrence of current imbalance due to iron core loss, and to solve the problem that when the output branch current is unbalanced and not discovered in time, it will have an adverse effect on the glass production quality and the kiln equipment, and an intelligent control method for the current balance distributor of the glass melting furnace is proposed.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] The intelligent control method for the current balance distributor of a glass melting furnace includes the following steps:

[0008] Step 1: Monitor the current data of the three parallel electrodes through the current monitoring module of the internal control component of the current balance distributor to determine whether the current is unbalanced; if the current is unbalanced, the current balance can be restored through three methods: resistance adjustment, non-closed winding adjustment and closed winding adjustment. The three error adjustment amounts are sorted from small to large, and the order is WC DZ, WC BH , WC RZ , if the current error value WC n <WC RZ , it is determined that the current balance can be restored by adjusting in one way, otherwise it is determined that multiple ways of adjustment are needed;

[0009] Step 2: When adjusting through the resistor, output the branch current data I according to Ohm's law n =U / R n , n=1,2,3, corresponding to the adjustment amount of output branch resistance ΔR n =U / I n +ΔI n , ΔI n The current data I corresponding to the balanced state of the corresponding output branch n The current data change is adjusted according to the resistance of the output branch ΔR n Adjust the corresponding output branch resistance; when adjusting through a non-closed winding, sort the adjustment amounts of the three adjustments of the number of turns of the winding, the tightness of the coil and the coil spacing; when adjusting through a closed winding, determine whether the effect of the coil winding direction on the output branch current is enhanced or weakened. If the output DC current needs to be enhanced, and the direction of the output branch current is opposite to the enhanced direction of the closed winding current, then change the winding direction of the closed winding coil, otherwise adjust the closed winding enhanced current according to the adjustment amount.

[0010] As a preferred embodiment of the present invention, a current monitoring module, a winding monitoring module, a core monitoring module and an operation adjustment module are provided inside the current balancing distributor;

[0011] The current monitoring module monitors the current data changes of the output main circuit and the three output branches, and processes the monitored current detection data to determine whether the output branch has current imbalance, and whether the current imbalance is related to the error and current fluctuation, so as to improve the accuracy of the current detection data;

[0012] The winding monitoring module detects the number of turns, coil tightness and coil spacing data of the non-closed winding and the closed winding to determine whether the current imbalance is caused by changes in the number of turns, coil tightness and coil spacing data of the winding;

[0013] The core monitoring module monitors the magnetic flux data, magnetic field strength data and temperature data of the core, and processes the monitored magnetic flux data, magnetic field strength data and temperature data to determine whether the core is damaged;

[0014] The operation adjustment module monitors the resistance adjustment position, winding adjustment turns, coil tightness adjustment and coil spacing adjustment when performing the recovery adjustment of the output branch ionization balance, and sends a buzzer alarm through a buzzer when the adjustment exceeds the adjustment amount.

[0015] As a preferred embodiment of the present invention, the current monitoring module processes the output branch current data in the following steps:

[0016] Step 1: Use high-precision current sensors installed in the three output branches of the current distributor to measure the current values ​​of the three branches in real time. The measured current values ​​are I 1 ,I 2 ,I 3 , then the balanced current value of the three output branches is I PH =I 1 +I 2 +I 3 / 3, by balancing the current value I PH The current error value WC of the three output branches is calculated by the difference between the measured current values ​​of the three output branches n , n = 1, 2, 3;

[0017] Step 2: If WC n >0, it means that the current value of the output branch exceeds the balance current value, and the current value of the output branch needs to be reduced; if WC n <0, it means that the current value of the output branch is lower than the balance current value, and the current value of the output branch needs to be increased;

[0018] Step 3: In a parallel circuit, the current distribution rule states that the current allocated to each load is inversely proportional to its resistance value; then, depending on whether the current error value is positive or negative, the resistance value of the output branch is adjusted to decrease or increase.

[0019] As a preferred embodiment of the present invention, the current monitoring module performs the following steps to process the current data accuracy:

[0020] Step 1: If I 1 +I 2 +I 3 =I and I 1 R 1 =I 2 R 2 =I 3 R 3 , then it is determined that the output branch current data detection is accurate, R 1 , R 2 , R 3 are the resistance values ​​of the three output branches respectively;

[0021] Step 2: retrieve the historical current detection data of the three output branches, sort them according to the detection time, and then draw the coordinate points in the binary coordinate system established by the detection time and current detection data, connect the adjacent coordinate points and calculate the slope XL of each segment of the connection, and compare the slope value XL of each segment of the connection with the preset slope value XL B For comparison, if |XL| <XL B , it is determined that the fluctuation of the historical current detection data is small and will not affect the accuracy of the current detection data; otherwise, it is determined that the fluctuation of the historical current detection data is large, and the slope value corresponding to the large fluctuation is marked, and the time interval T of the fluctuation value is BD Keep records;

[0022] Step 3: If there is a linear relationship between the time interval data, the time of the next fluctuation is determined based on the linear relationship, and the current data is collected at the middle moment of the two fluctuation moments; if there is no linear relationship between the time interval data, the historical fluctuation time mean data SJ is calculated based on the historical fluctuation time interval data and the historical fluctuation number data 1 , determine that after the last fluctuation, the time SJ 1 After that, the fluctuation will occur again, and the average SJ of the recent fluctuation time interval data and the historical fluctuation time average data is calculated. 2 , after the fluctuation occurs, the time SJ 2 Then the current data is detected.

[0023] As a preferred embodiment of the present invention, the winding monitoring module processes the data of the number of turns of the non-closed winding as follows:

[0024] Step 1: When the number of turns of the non-closed winding outside the core is changed, the inductance of the non-closed winding will change. According to the characteristics of inductance, the inductance has an obstructive effect on the change of current. The relationship between the number of turns of the non-closed winding outside the core and the current is that the voltage across the inductor is U = (N*μ*S*l)*dI / dt, dI / dt is the rate of change of current with time, N is the number of turns of the non-closed winding outside the core, μ is the magnetic permeability of the core, S is the outer area of ​​the core surrounded by the non-closed winding, and l is the length of the non-closed winding;

[0025] Step 2: U, N, μ, S, l and time t are all known quantities, so the relationship between the number of turns of the non-closed winding outside the iron core and the current can be calculated. When adjusting the current on the three output branches, the number of turns of the non-closed winding wound on the outside of the iron core can be used to adjust the current;

[0026] Step 3: The three output branches are connected in parallel, and the current relationship between the output branches is I = I 1 +I 2 +I 3According to the relationship between the two electrodes, there is no winding in the output branch corresponding to the electrode 2, and the current regulation of the output branch corresponding to the electrode 2 can be achieved by adjusting the non-closed winding of the electrode 1 and the electrode 3.

[0027] As a preferred embodiment of the present invention, the winding monitoring module processes data on the tightness of the non-closed winding coil as follows:

[0028] Step 1: The calculation formula of inductance L is: L = N 2 *μ*S / l, when the distance between the non-closed winding and the iron core increases, the effective cross-sectional area of ​​the magnetic circuit will decrease, because the diffusion range of the magnetic field increases, some magnetic field lines cannot completely pass through the non-closed winding, and the length of the magnetic circuit will also increase;

[0029] Step 2: In the initial state, the non-closed winding fits tightly with the iron core, and the effective cross-sectional area of ​​the magnetic circuit is S 0 , the magnetic path length is l 0 ; When the distance between the non-closed winding and the core is d, the relationship between the effective cross-sectional area and the distance d is S d =S 0 -k 1 *d, the relationship between the magnetic path length and the distance d is l d = l 0 +k 2 *d,k 1 , k 2 are the coefficients related to the effective cross-sectional area and magnetic path length, respectively;

[0030] Step 3: Calculate the current data adjustment amount through the calculation formula of the inductor voltage U, and adjust the distance d between the non-closed winding and the iron core according to the current data adjustment amount.

[0031] As a preferred embodiment of the present invention, the winding monitoring module processes the data of the non-closed winding coil spacing as follows:

[0032] Step 1: When the number of turns of the non-closed winding, the magnetic permeability of the core and the effective cross-sectional area remain unchanged, when the coil outside the core is wound more tightly, the diffusion range of the magnetic field is relatively concentrated, and more magnetic field lines can completely pass through the winding. The larger the effective cross-sectional area S of the magnetic circuit, according to the calculation formula of the inductance L, the larger the inductance of the output branch at this time;

[0033] Step 2: Calculate the current data adjustment amount through the calculation formula of the inductor voltage U and the calculation formula of the inductance L, and adjust the non-closed winding coil spacing data according to the current data adjustment amount.

[0034] As a preferred embodiment of the present invention, the steps of data processing of the closed winding by the winding monitoring module are as follows:

[0035] Step 1: The current value in the closed winding is I B When the magnetic field generated is B, the induced electromotive force generated is E = -(N*B*S)*dI B / dt, the induced current I generated by the induced electromotive force E in the output branch E =E / Z SC , Z SC is the resistance value of the output branch. If the induced current has the same direction as the original current of the output branch, the output branch current will be enhanced. The enhanced current value is I n +I E , I n is the original current data of the output branch, n=1, 2, 3;

[0036] Step 2: According to the characteristics of the parallel circuit, the sum of the output branch currents is equal to the total current. If the output branch current increases, the output main current will decrease accordingly while the total current remains unchanged.

[0037] Step 3: Based on the difference between the detected current data and the balanced current data, determine whether the current data of the corresponding output branch needs to be increased or decreased. If the output DC current needs to be enhanced, and the direction of the output branch current is opposite to the enhanced direction of the closed winding current, the winding direction of the closed winding coil is changed. Otherwise, the closed winding enhanced current is adjusted according to the adjustment amount.

[0038] As a preferred embodiment of the present invention, the core monitoring module processes the core loss data in the following steps:

[0039] Step 1: Use a fluxmeter to regularly measure the magnetic flux data of the core and record it. When the core works normally and there is no obvious loss, determine the reference range of the magnetic flux by measuring the set time. The reference range is 100Wb-120Wb. If the measured value is not within the reference range and drops below 80% of the minimum value of the reference range, it is determined that the core may have loss;

[0040] Step 2: Arrange Hall sensors around the iron core, measure the magnetic field strength at different positions of the iron core, and record it. Determine the reference range of the magnetic field strength by measuring the set time. If the measured value is not within the reference range and drops below 80% of the lowest value of the reference range, it is determined that the iron core may have loss;

[0041] Step 3: Use a temperature sensor to continuously monitor the temperature data of the iron core, set a temperature threshold and a temperature change threshold, then process the temperature data within the detection time to obtain a temperature change value, then compare the temperature data and the temperature change value with the temperature threshold and the temperature change threshold respectively. If the temperature data or the temperature change value exceeds the corresponding threshold, it is determined that the iron core may have loss;

[0042] Step 4: From step 1 to step 3, when the core loss is detected in each step, the loss value SH is counted up by one. After step 3 is completed, the loss values ​​SH are compared. If SH≥2, it is determined that the core loss exists.

[0043] Compared with the prior art, the present invention has the following beneficial effects:

[0044] 1. The present invention can achieve current balance by reasonably distributing the current of three parallel electrodes, thus avoiding the adverse effects of bias current on refractory materials and glass production;

[0045] 2. The current values ​​of the three output circuits are detected through the current monitoring module. Before determining whether the current is unbalanced, the accuracy of the current data is detected, and whether the current data is affected by the fluctuation value is detected to improve the accuracy of the detected current data. When it is determined that the current is unbalanced, the number of turns of the non-closed winding and the closed winding, the tightness of the coil and the coil spacing data are detected to determine whether the current imbalance is caused by changes in the number of turns of the winding, the tightness of the coil and the coil spacing data. If the current imbalance is caused by the winding, the winding is restored to its original state; if it is not caused by the winding, the current balance of the three output branches is quickly restored through resistance or winding adjustment; then the loss of the core is estimated, and measures are taken in advance for maintenance and adjustment to avoid the occurrence of current imbalance problems due to core loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0047] Figure 1 It is a system flow chart of the present invention;

[0048] Figure 2 This is a diagram of the winding structure of the core winding of the present invention. DETAILED DESCRIPTION

[0049] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only 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 ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] Example:

[0051] See also Figure 1-2 As shown, an intelligent control method for a current balance distributor of a glass melting furnace is applied, wherein a control component is arranged inside the current balance distributor, and the control component includes a current monitoring module, a winding monitoring module, an iron core monitoring module and an operation adjustment module;

[0052] The iron core is made of iron sheets with good magnetic conductivity and low hysteresis loss. A connecting wire is wound around the outside of the iron core. The working current I is divided into three before passing through the device. Two of the three paths are connected to electrode one and electrode three through the two coils of the primary non-closed winding. The current is I 1 ,I 3 The primary non-closed winding is made of a copper bar with a large current carrying capacity; one of the windings is directly connected to electrode 2, and its current is I 2 , the secondary non-closed winding is made of enameled copper wire and is a closed winding; electrode one, electrode two, and electrode three must be arranged in sequence; the relationship between the currents is I = I 1 +I 2 +I 3 Before using the present invention 1 ,I 2 ,I 3 The numerical value is unstable and the phenomenon of bias flow is very likely to occur. After using the present invention, it can be achieved. 1 =I 3 , I 2 Slightly lower than I 1 and I 3 , and keep stable, set I 2 with I 1 and I 3 The difference between them is a, then I 1 =I 3 =I 2 +a;

[0053] The current monitoring module detects the current values ​​of the three output circuits. 1 +I 2 +I 3 =I and I 1 R 1 =I 2 R 2 =I 2 R 2 , then it is determined that the output branch current data detection is accurate, R 1 , R 2 , R 3 are the resistance values ​​of the three output branches respectively; after determining that the output branch current data detection is accurate, retrieve the historical current detection data of the three output branches, sort them according to the detection time, and then draw the coordinate points in the binary coordinate system established by the detection time and the current detection data, connect the adjacent coordinate points and calculate the slope XL of each segment of the connection, and compare the slope value XL of each segment of the connection with the preset slope value XL B For comparison, if |XL| <XL B, it is determined that the fluctuation of the historical current detection data is small and will not affect the accuracy of the current detection data; otherwise, the value with a large slope fluctuation is marked, and the time interval T of the fluctuation value is BD Keep records;

[0054] For each time interval data T BD If the time interval data has a linear relationship, the time of the next fluctuation is determined based on the linear relationship, and the current data is collected at the middle moment of the two fluctuation moments; if the time interval data does not have a linear relationship, the historical fluctuation time mean data SJ is calculated based on the historical fluctuation time interval data and the historical fluctuation number data. 1 , determine that after the last fluctuation, the time SJ 1 After that, fluctuations may occur again. Calculate the average SJ of the recent fluctuation time interval data and the historical fluctuation time average data 2 , after the fluctuation occurs, the time SJ 2 Then the current data is detected to improve the accuracy of the current detection data;

[0055] The current values ​​of the three branches are measured in real time by high-precision current sensors installed in the three output branches of the current distributor. The measured current values ​​are I 1 ,I 2 ,I 3 , then the balanced current value of the three output branches is I PH =I 1 +I 2 +I 3 / 3, by balancing the current value I PH The current error value WC of the three output branches is calculated by the difference between the measured current values ​​of the three output branches n , n=1,2,3, if WC n >0, it means that the current value of the output branch exceeds the balance current value, and the current value of the output branch needs to be reduced; if WC n <0, it means that the current value of the output branch is lower than the balance current value, and the current value of the output branch needs to be increased;

[0056] The working principle of the current distributor is based on the current distribution rule and Ohm's law. In a parallel circuit, the current distribution rule states that the current allocated to each load is inversely proportional to their resistance value. Therefore, when the resistance value of an output branch is reduced, the current flowing through the output branch will decrease. When the total working current value remains unchanged, the current of other branches will increase accordingly, achieving the purpose of redistributing the current. According to whether the current error value is positive or negative, the resistance value of the output branch is reduced or increased to achieve balanced distribution of current on the three output branches.

[0057] The winding monitoring module detects the number of turns of the non-closed winding, the tightness of the coil and the coil spacing data. When the number of turns of the non-closed winding outside the iron core is changed, the inductance of the non-closed winding will change. According to the characteristics of the inductance, the inductance has an obstructive effect on the change of current; when the number of turns of the non-closed winding increases, the inductance increases, and the obstruction to the current increases, resulting in a decrease in the current of the corresponding output branch; when the number of turns of the non-closed winding decreases, the inductance decreases, the obstruction to the current weakens, and the current of the corresponding output branch increases; the relationship between the number of turns of the non-closed winding outside the iron core and the current is determined by the inductor's current. U=(N*μ*S*l)*dI / dt, dI / dt is the rate of change of current with time, N is the number of turns of the non-closed winding outside the core, μ is the magnetic permeability of the core, S is the area of ​​the outside of the core surrounded by the non-closed winding, l is the length of the non-closed winding; U, N, μ, S, l and time t are all known quantities, then the relationship between the number of turns of the non-closed winding outside the core and the current can be calculated, when the current on the three output branches is adjusted, it can be adjusted by the number of turns of the non-closed winding wound on the outside of the core; the three output branches are connected in parallel, and the current relationship between the output branches is I=I 1 +I 2 +I 3 The relationship between the output branch corresponding to the electrode 2 does not have a winding, and the current regulation of the output branch corresponding to the electrode 2 can be achieved by adjusting the non-closed winding of the electrode 1 and the electrode 3;

[0058] The calculation formula of inductance L is: L = N 2 *μ*S / l, when the distance between the non-closed winding and the iron core increases, the effective cross-sectional area of ​​the magnetic circuit will decrease, because the diffusion range of the magnetic field increases, some magnetic field lines cannot completely pass through the non-closed winding, and the length of the magnetic circuit will also increase; every increase in the distance d between the non-closed winding wound on the outside of the iron core and the iron core will increase the length l of the non-closed winding, and the effective cross-sectional area S will decrease. In the initial state, the non-closed winding fits tightly with the iron core, and the effective cross-sectional area of ​​the magnetic circuit is S 0 , the magnetic path length is l 0 When the distance between the non-closed winding and the core is d, the relationship between the effective cross-sectional area and the distance d is S d =S 0 -k 1 *d, the relationship between the magnetic path length and the distance d is l d = l 0 +k 2 *d,k 1 , k 2are coefficients related to the effective cross-sectional area and the length of the magnetic circuit, respectively. According to the calculation formula of the inductance L, when the number of turns of the non-closed winding outside the core and the magnetic permeability of the core remain unchanged, the larger the ratio of the effective cross-sectional area S to the length l of the non-closed winding, the larger the inductance L value and the smaller the current value.

[0059] There is a difference in the spacing between the coils of the non-closed winding wound on the outside of the core. When the number of turns of the non-closed winding, the magnetic permeability of the core and the effective cross-sectional area remain unchanged, when the coils on the outside of the core are wound more tightly, the diffusion range of the magnetic field is relatively concentrated, and more magnetic field lines can completely pass through the winding. The larger the effective cross-sectional area S of the magnetic circuit, according to the calculation formula of the inductance L, it can be known that the inductance of the output branch at this time is greater;

[0060] A closed winding is arranged below the non-closed winding positions of the electrodes 1 and 3 on the outer side of the iron core. When current passes through the closed winding, since the non-closed winding is closed, the current can form a circulation in the non-closed winding, thereby enhancing the magnetic field strength in the iron core. The enhancement of the magnetic field can increase the magnetic permeability of the iron core, making the transmission of current in the iron core more efficient and reducing energy loss.

[0061] The influence of closed winding on output branch: two output branches are wound on both sides of the iron core, and the closed winding is located below the winding position of the output branch. When current passes through the closed winding, a magnetic field will be generated in the iron core; this magnetic field will interact with the current in the output branch. According to the principle of electromagnetic induction, an induced electromotive force will be generated in the output branch, and the induced electromotive force will generate an induced current in the output branch. If the direction of the induced current is the same as the original current direction in the output branch, it will enhance the current of the output branch; otherwise, it will weaken it; the current value in the closed winding is I B When the magnetic field generated is B, the induced electromotive force generated is E = -(N*B*S)*dI B / dt, the induced current I generated by the induced electromotive force E in the output branch E =E / Z SC , Z SC is the resistance value of the output branch. If the induced current has the same direction as the original current of the output branch, the output branch current will be enhanced. The enhanced current value is I n +I E , I n is the original current data of the output branch, n = 1, 2, 3; according to the characteristics of the parallel circuit, the sum of the currents of each output branch is equal to the total current. If the output branch current increases, the output main current will decrease accordingly when the total current remains unchanged; if the total current can change, the output main current may also be affected to a certain extent, but this impact is relatively small;

[0062] When current passes through the winding, heat is generated, causing the winding temperature to rise, resulting in increased resistance. The change in resistance will affect the magnitude and distribution of the current, thereby affecting the current balance. A sudden increase or decrease in load, or a change in the impedance characteristics of the load, will cause an imbalance in the current of each branch. The magnetic permeability of the core changes with temperature, and the loss of the core will also affect the current balance. In summary, changes in core characteristics, changes in winding resistance, and changes in output branch load will all cause current imbalance.

[0063] Use high-precision temperature sensors to be arranged on the surface of the winding and the center of the core to obtain the temperature data of the winding and the core. Use current sensors to monitor the current data of each output branch, use resistance measuring instruments to monitor the resistance data of each output branch, and use power sensors to measure the power consumption of the load.

[0064] The magnetic flux data of the iron core is measured regularly by a flux meter and recorded. When the iron core works normally and there is no obvious loss, the reference range of the magnetic flux is determined by measuring the set time, and the reference range is 100Wb-120Wb. If the measured value is not within the reference range and drops below 80% of the lowest value of the reference range, it is determined that the iron core may have losses. Hall sensors are arranged around the iron core to measure the magnetic field strength at different positions of the iron core and record it. The reference range of the magnetic field strength is determined by measuring the set time. If the measured value is not within the reference range and drops below 80% of the lowest value of the reference range, it is determined that the iron core may have losses. The temperature data of the iron core is continuously monitored by a temperature sensor, and a temperature threshold and a temperature change threshold are set. The temperature data within the detection time is then processed to obtain a temperature change value. The temperature data and the temperature change value are then compared with the temperature threshold and the temperature change threshold respectively. If the temperature data or the temperature change value exceeds the corresponding threshold, it is determined that the iron core may have losses.

[0065] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. An intelligent control method for a current balance distributor of a glass melting furnace, characterized in that: The intelligent control method of the current balance distributor of the glass melting furnace comprises the following steps: Step 1: Monitor the current data of the three parallel electrodes through the current monitoring module of the internal control component of the current balance distributor to determine whether the current is unbalanced; if the current is unbalanced, the current balance can be restored through three methods: resistance adjustment, non-closed winding adjustment and closed winding adjustment. The three error adjustment amounts are sorted from small to large, and the order is: , , , if the current error value , it is determined that the current balance can be restored by adjusting in one way, otherwise it is determined that multiple ways of adjustment are needed; Step 2: When adjusting through resistance, output branch current data according to Ohm's law , , corresponding to the resistance adjustment of the output branch , The current data of the corresponding balanced state of the corresponding output branch The current data change is adjusted according to the resistance of the output branch The corresponding output branch resistance is adjusted; when adjusting through a non-closed winding, the adjustment amounts of the three adjustments of the number of turns of the winding, the tightness of the coil and the coil spacing are sorted, and then the corresponding item or several items are adjusted according to the adjustment amount; when adjusting through a closed winding, it is determined whether the effect of the coil winding direction on the output branch current is enhanced or weakened. If the output DC current needs to be enhanced, and the direction of the output branch current is opposite to the enhanced direction of the closed winding current, the winding direction of the closed winding coil is changed, otherwise the closed winding is adjusted according to the adjustment amount to enhance the current.

2. The intelligent control method for a current balance distributor of a glass melting furnace according to claim 1 is characterized in that: The current balance distributor is internally provided with a current monitoring module, a winding monitoring module, an iron core monitoring module and an operation adjustment module; The current monitoring module monitors the current data changes of the output main circuit and the three output branches, and processes the monitored current detection data to determine whether the output branch has current imbalance, and whether the current imbalance is related to the error and current fluctuation; The winding monitoring module detects the number of turns, coil tightness and coil spacing data of the non-closed winding and the closed winding to determine whether the current imbalance is caused by changes in the number of turns, coil tightness and coil spacing data of the winding; The core monitoring module monitors the magnetic flux data, magnetic field strength data and temperature data of the core, and processes the monitored magnetic flux data, magnetic field strength data and temperature data to determine whether the core is damaged; The operation adjustment module monitors the resistance adjustment position, the number of winding turns, the coil tightness adjustment and the coil spacing adjustment when performing the recovery adjustment of the output branch current balance, and sends a buzzer alarm through a buzzer when the adjustment exceeds the adjustment amount.

3. The intelligent control method for a current balance distributor of a glass melting furnace according to claim 2 is characterized in that: The current monitoring module processes the output branch current data in the following steps: Step 1: Use high-precision current sensors installed in the three output branches of the current distributor to measure the current values ​​of the three branches in real time. The measured current values ​​are , , , then the balanced current values ​​of the three output branches are , by balancing the current value The current error values ​​of the three output branches are calculated by the difference between the measured current values ​​of the three output branches , ; Step 2: If , it means that the current value of the output branch exceeds the balance current value, and the current value of the output branch needs to be reduced; if , it means that the current value of the output branch is lower than the balance current value, and the current value of the output branch needs to be increased; Step 3: In a parallel circuit, the current distribution rule states that the current allocated to each load is inversely proportional to its resistance value; then, depending on whether the current error value is positive or negative, the resistance value of the output branch is adjusted to decrease or increase.

4. The intelligent control method for a current balance distributor of a glass melting furnace according to claim 3 is characterized in that: The current monitoring module processes the current data accurately in the following steps: Step 1: If and , then it is determined that the output branch current data detection is accurate, , , are the resistance values ​​of the three output branches respectively; Step 2: Retrieve the historical current detection data of the three output branches, sort them according to the detection time, and then draw the coordinate points in the binary coordinate system established by the detection time and current detection data, connect the adjacent coordinate points and calculate the slope value of each segment of the connection line , the slope value of each segment connecting the lines Compare the values ​​with the preset slopes respectively For comparison, if , it is determined that the fluctuation of historical current detection data is small; On the contrary, it is determined that the historical current detection data has a large fluctuation, and the slope value corresponding to the large fluctuation is marked, and the time interval of the fluctuation value is Keep records; Step 3: If there is a linear relationship between the time interval data, the time of the next fluctuation is determined based on the linear relationship, and the current data is collected at the middle moment of the two fluctuation moments; if there is no linear relationship between the time interval data, the historical fluctuation time mean data is calculated based on the historical fluctuation time interval data and the historical fluctuation number data. , determine the time after the last fluctuation There may be another fluctuation in the future, calculate the average of the most recent fluctuation time interval data and the historical fluctuation time average data , after the fluctuation occurs, the time Then the current data is detected.

5. The intelligent control method for a current balance distributor of a glass melting furnace according to claim 2 is characterized in that: The steps for the winding monitoring module to process the data of the number of turns of the non-closed winding are as follows: Step 1: When the number of turns of the non-closed winding outside the core is changed, the inductance of the non-closed winding will change. According to the characteristics of inductance, the inductance has an obstructive effect on the change of current. The relationship between the number of turns of the non-closed winding outside the core and the current is the voltage through the inductor. , is the rate of change of current with time, is the number of turns of the non-closed winding outside the core, is the magnetic permeability of the core, is the outer area of ​​the core surrounded by the non-closed winding, is the length of the non-closed winding; Step 2: and time If they are all known quantities, the relationship between the number of turns of the non-closed winding on the outside of the iron core and the current can be calculated. When adjusting the current on the three output branches, the current can be adjusted by the number of turns of the non-closed winding wound on the outside of the iron core. Step 3: Three output branches are connected in parallel, and the current relationship between the output branches exists According to the relationship between the two electrodes, there is no winding in the output branch corresponding to the electrode two, and the current regulation of the output branch corresponding to the electrode two is achieved by adjusting the non-closed winding of the electrode one and the electrode three.

6. The intelligent control method for a current balance distributor of a glass melting furnace according to claim 5, characterized in that: The winding monitoring module processes the data of the tightness of the non-closed winding coil as follows: Step 1: Inductor The calculation formula is: ,When the distance between the non-closed winding and the core increases, the effective cross-sectional area of ​​the magnetic circuit will decrease, because the diffusion range of the magnetic field increases, some magnetic field lines cannot completely pass through the non-closed winding, and the length of the magnetic circuit will also increase; Step 2: In the initial state, the non-closed winding fits tightly with the iron core. At this time, the effective cross-sectional area of ​​the magnetic circuit is , the magnetic path length is ; When the distance between the non-closed winding and the core is When the effective cross-sectional area is The relationship between , magnetic path length and distance The relationship between , , are the coefficients related to the effective cross-sectional area and magnetic path length, respectively; Step 3: Voltage across the inductor The calculation formula is used to calculate the current data adjustment amount, and the distance between the non-closed winding and the iron core is adjusted according to the current data adjustment amount. of adjustment.

7. The intelligent control method for a current balance distributor of a glass melting furnace according to claim 6, characterized in that: The winding monitoring module processes the data of the non-closed winding coil spacing as follows: Step 1: When the number of turns of the non-closed winding, the magnetic permeability of the core and the effective cross-sectional area remain unchanged, when the coil outside the core is wound more tightly, the diffusion range of the magnetic field is relatively concentrated, and more magnetic field lines can completely pass through the winding, and the effective cross-sectional area of ​​the magnetic circuit is The larger the inductance, the The calculation formula shows that the larger the inductance of the output branch at this time; Step 2: Voltage across the inductor Calculation formula and inductance The calculation formula is used to calculate the current data adjustment amount, and the non-closed winding coil spacing data is adjusted according to the current data adjustment amount.

8. The intelligent control method for a current balance distributor of a glass melting furnace according to claim 2, characterized in that: The winding monitoring module processes the closed winding data in the following steps: Step 1: The current value in the closed winding is When , the magnetic field generated is , the induced electromotive force generated , induced electromotive force The induced current generated in the output branch , is the resistance value of the output branch. If the induced current has the same direction as the original current of the output branch, the output branch current will be enhanced. The enhanced current value is , is the original current data of the output branch, ; Step 2: According to the characteristics of the parallel circuit, the sum of the output branch currents is equal to the total current. If the output branch current increases, the output main current will decrease accordingly while the total current remains unchanged. Step 3: Based on the difference between the detected current data and the balanced current data, determine whether the current data of the corresponding output branch needs to be increased or decreased. If the output DC current needs to be enhanced, and the direction of the output branch current is opposite to the enhanced direction of the closed winding current, the winding direction of the closed winding coil is changed. Otherwise, the closed winding enhanced current is adjusted according to the adjustment amount.

9. The intelligent control method for a current balance distributor of a glass melting furnace according to claim 2, characterized in that: The steps for the core monitoring module to process the core loss data are as follows: Step 1: Use a fluxmeter to regularly measure the magnetic flux data of the core and record it. When the core is working normally and there is no obvious loss, determine the reference range of the magnetic flux by measuring the set time. The reference range is If the measured value is not within the reference range and drops to the minimum value of the reference range If the value is below, it is determined that there may be loss in the core; Step 2: Arrange Hall sensors around the core, measure the magnetic field strength at different positions of the core, and record it. Determine the reference range of the magnetic field strength by measuring the set time. If the measured value is not within the reference range and drops to the minimum value of the reference range, If the value is below, it is determined that there may be loss in the core; Step 3: Use a temperature sensor to continuously monitor the temperature data of the iron core, set a temperature threshold and a temperature change threshold, then process the temperature data within the detection time to obtain a temperature change value, then compare the temperature data and the temperature change value with the temperature threshold and the temperature change threshold respectively. If the temperature data or the temperature change value exceeds the corresponding threshold, it is determined that the iron core may have loss; Step 4: From step 1 to step 3, when the core loss is detected in each step, the loss value After step 3 is completed, the count is increased by one. For comparison, if , it is determined that there is loss in the core.

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