An operation control system for a submerged arc furnace

Abstract

The present invention relates to the field of industrial metallurgy technology, and in particular to an operation control system of an ore-heating furnace, comprising a transformer controller, an electrode control unit, a feeding unit, a detection unit and a data analysis unit. The transformer controller is used to adjust the gear of the secondary voltage; the electrode control unit is used to control the pressure release and lifting of the electrode; the feeding unit is used to add ore into the ore-heating furnace; the detection unit is used to detect the material surface height, material trough weight, electrode height, electrode thickness and electrode temperature of the ore in the furnace; the data analysis unit is used to adjust the height difference of the three-phase electrodes; judge the electrode consumption degree, adjust the electrode pressure release cycle and the depth of the electrode inserted into the ore in the furnace; draw a temperature change curve, judge the fluctuation of the electrode current, and adjust the secondary voltage gear and the height of the electrode. The present invention adjusts the height of the three-phase electrode according to the electrode consumption degree and the fluctuation of the electrode current, thereby improving the stability and operation efficiency of the ore-heating furnace.

Description

Technical Field

[0001] The invention relates to the technical field of industrial metallurgy, and in particular to an operation control system of a submerged arc furnace. Background Art

[0002] Submerged arc furnace is also called arc furnace or resistance furnace. It is mainly used for reducing and smelting raw materials such as ore, carbonaceous reducing agent and solvent. It mainly produces ferroalloys such as ferrosilicon, ferromanganese, ferrochrome, ferrotungsten, silicon-manganese alloy, etc. It is an important industrial raw material in the metallurgical industry and chemical raw materials such as calcium carbide. In the production process, the three-phase electrode transmits the low-voltage high current transmitted by the short network to the furnace, and the arc generated at the end of the electrode converts the electrical energy into heat energy, forming a high-temperature zone of up to 2000℃ in the charge. In the high-temperature zone, the oxidized ore and the coke as a reducing agent undergo a reduction reaction to extract the metal elements from the ore. The production is continuous, so the coke and ore raw materials must be continuously fed into the furnace from the feeding pipe to ensure the continuity of the reduction reaction. The obtained liquid product will accumulate in the molten pool, and the workers will regularly release the molten metal from the tapping hole to obtain the alloy product after pouring.

[0003] Chinese Patent Publication No.: CN103777535B discloses an intelligent energy-saving control system for electric arc furnace load, including an intelligent energy-saving control unit for load; a current transformer, a first voltage transformer and a primary power comprehensive collection module on the primary side of the electric arc furnace transformer; a squirrel-cage air-core current transformer, a second voltage transformer, a comprehensive conditioning module and a secondary power comprehensive collection module on the secondary side of the electric arc furnace transformer; an electric arc furnace transformer gear controller, one end of which is connected to the electric arc furnace transformer and the other end is connected to the intelligent energy-saving control unit for load; a low-voltage reactive power compensation device control unit, which is connected to the intelligent energy-saving control unit for load; and a three-phase electrode lifting control unit, which is connected to the intelligent energy-saving control unit for load. It can be seen that the intelligent energy-saving control system for electric arc furnace load has the following problems:

[0004] The parameters of the electric power supply system of the submerged arc furnace are complex, involving power quality issues such as voltage deviation, voltage fluctuation and three-phase imbalance. The existing control algorithms are difficult to adapt to these characteristics, resulting in poor control effects. Summary of the invention

[0005] To this end, the present invention provides an operation control system of an electric arc furnace, which is used to overcome the problem that the parameters of the electric arc furnace power supply system in the prior art are complex, involving power quality problems such as voltage deviation, voltage fluctuation and three-phase imbalance, and the existing control algorithm is difficult to adapt to these characteristics, resulting in poor control effect.

[0006] To achieve the above object, the present invention provides an operation control system of a submerged arc furnace, comprising:

[0007] A transformer controller, which is connected to the furnace transformer and is used to adjust the gear of the secondary voltage by adjusting the furnace transformer coefficient according to the signal of the data analysis unit;

[0008] An electrode control unit, which is connected to the three-phase electrode and is used to control the pressing, releasing and lifting of the electrode according to the signal of the data analysis unit;

[0009] A feeding unit, which is connected to the data analysis unit and includes a mixing bin, a feed cart, and a plurality of feed troughs and feed pipes, and is used to add ore into the submerged arc furnace according to the signal of the data analysis unit;

[0010] A detection unit, which is connected to the data analysis unit, includes a weight sensor, an ultrasonic detector and an infrared thermometer, and is used to detect the material surface height, material trough weight, electrode height, electrode thickness and electrode temperature of the ore in the furnace, and transmit the detection data to the data analysis unit;

[0011] A data analysis unit is used to determine the material trough that needs to be charged based on the replenishment weight; calculate the material surface height difference of the ore in the furnace, and transmit the signal for opening and closing the material trough based on the comparison result of the material surface height difference and the material surface height difference evaluation value; calculate the height difference between the three-phase electrodes, and adjust the height of the three-phase electrodes based on the comparison result of the electrode height difference and the electrode height difference interval and the height of the electrode from the bottom of the ore furnace; judge the electrode consumption degree based on the electrode consumption speed, adjust the electrode control unit to perform the electrode pressing and releasing cycle and the depth of the electrode inserted into the ore in the furnace; draw a temperature change curve based on the electrode temperature, judge the volatility of the electrode current, and adjust the secondary voltage gear or the height of the electrode.

[0012] Furthermore, before the ore-bearing furnace is started, the detection unit detects the weight carried by any trough on the top of the ore-bearing furnace, and the data analysis unit compares the weight of any trough with the replenishment weight.

[0013] If the weight of any trough is less than or equal to the replenishment weight, the data analysis unit determines that there is less ore in the trough, sends a signal to the feeding unit, opens the furnace top mixing silo, controls the feed car to receive the material, and the feed car runs along the set track to the trough to feed it;

[0014] Among them, the replenishment weight is the product of the full load weight of the material trough and the required feeding coefficient. The actual material surface height of the ore in the electric arc furnace before feeding is less than the standard material surface height.

[0015] Furthermore, the data analysis unit calculates the difference between the actual material surface height detected by the detection unit and the standard material surface height, and compares the material surface height difference with the material surface height difference evaluation value.

[0016] If the material surface height difference is greater than the material surface height difference evaluation value, the data analysis unit determines that the material surface height of the ore in the ore furnace is low, and the data analysis unit transmits a signal to the feeding unit to open the feeding pipe according to the ratio of the material surface height difference to the standard material surface height to uniformly feed the ore furnace, and stops feeding when the material surface height of the ore in the ore furnace is within the normal production range;

[0017] Among them, the normal production range is an interval consisting of the sum of the standard material surface height and the positive and negative material surface height difference evaluation values, and the material surface height difference evaluation value can be adjusted according to the specifications of the ore-fired furnace.

[0018] Further, the detection unit detects the first electrode height, the second electrode height and the third electrode height of the three-phase electrode, the data analysis unit calculates a first height difference according to the first electrode height and the second electrode height, calculates a second height difference according to the second electrode height and the third electrode height, calculates a third height difference according to the first electrode height and the third electrode height, and compares any height difference with the electrode height difference interval.

[0019] If any height difference value does not fall within the electrode height difference value interval, the data analysis unit determines that the height difference value between two electrodes corresponding to any height difference value in the three-phase electrodes is too large;

[0020] If the height difference between any two electrodes does not fall within the electrode height difference interval, the data analysis unit determines that the height of the electrode corresponding to the height difference between any two electrodes in the three-phase electrodes is too large or too small;

[0021] The electrode height is the height of the vertex of the bottom end of the electrode from the ground, and the electrode height difference range consists of positive and negative maximum electrode height differences.

[0022] Further, when the height difference between two electrodes corresponding to any height difference among the three-phase electrodes is too large, the data analysis unit compares the heights of the two electrodes, and increases or decreases the heights of the two electrodes according to the comparison result, and the degree of decrease and increase is positively correlated with the quotient of the electrode height difference and the maximum electrode height difference;

[0023] When the height of the electrode corresponding to any two electrode height differences in the three-phase electrodes is too large or too small, the data analysis unit increases or decreases the height of the corresponding electrode, and the degree of decrease is positively correlated with the quotient of the larger electrode height difference and the maximum electrode height difference.

[0024] Furthermore, during the process of adjusting the electrode height difference, the data analysis unit calculates the height of any electrode from the bottom of the submerged arc furnace according to the initial height of the three-phase electrode and the descending length of any electrode, and compares the height of any electrode from the bottom of the submerged arc furnace with the critical height.

[0025] If the height of any electrode from the bottom of the submerged arc furnace is less than the critical height, the data analysis unit determines that the electrode is inserted deeply into the submerged arc furnace and sends a signal to the electrode control unit to raise the electrode.

[0026] Furthermore, the detection unit uses an ultrasonic detector to detect the electrode thickness, and the electrode thickness is the thickness of the electrode paste in the electrode shell. The data analysis unit calculates the electrode consumption rate according to the change in the electrode thickness per unit time, and compares the electrode consumption rate with the standard electrode consumption rate.

[0027] If the electrode consumption rate is greater than the standard electrode consumption rate, the data analysis unit determines that the electrode consumption rate is faster;

[0028] If the electrode consumption speed is lower than the standard electrode consumption speed, the data analysis unit calculates the speed difference between the electrode consumption speed and the standard electrode consumption speed.

[0029] If the speed difference between the electrode consumption speed and the standard electrode consumption speed is greater than the speed difference evaluation value, the data analysis unit determines that the electrode consumption speed is slow;

[0030] The standard electrode consumption rate is the electrode consumption rate when the electrode temperature is within the standard temperature range.

[0031] Furthermore, when the electrode consumption rate is relatively fast, the data analysis unit reduces the electrode pressing and releasing cycle of the electrode control unit according to the ratio of the electrode consumption rate to the standard electrode consumption rate;

[0032] When the electrode consumption speed is slow, the data analysis unit sends a signal to the electrode control unit to lower the electrode according to the ratio of the speed difference value to the speed difference evaluation value, thereby increasing the depth of the electrode inserted into the ore in the furnace.

[0033] Further, the detection unit detects the electrode temperature by an infrared temperature meter, and the data analysis unit draws a temperature change curve according to the electrode temperature and obtains a derivative function of the temperature change curve;

[0034] If the temperature value of the temperature change curve at any time exceeds the standard temperature range, the data analysis unit determines its change trend according to the derivative function of the temperature change curve.

[0035] If the temperature value of the temperature change curve at any time is higher than the standard temperature range, and the value of the derivative function is greater than zero, the data analysis unit determines that the temperature value of the electrode is still rising continuously, and the current in the electrode fluctuates greatly.

[0036] Wherein, if the value of the derivative function at any time is less than or equal to zero, the data analysis unit determines that the temperature value of the electrode remains unchanged or is decreasing;

[0037] If the temperature value of the temperature change curve at any time is lower than the standard temperature range, and the value of the derivative function is less than zero, the data analysis unit determines that the temperature value of the electrode is still continuously decreasing, and the current in the electrode fluctuates greatly.

[0038] If the value of the derivative function at any time is greater than or equal to zero, the data analysis unit determines that the temperature value of the electrode remains unchanged or is rising.

[0039] Furthermore, when the current in the electrode fluctuates greatly and the temperature value of the electrode continues to rise or fall, the transformer controller reduces or increases the secondary voltage level by adjusting the furnace transformer coefficient;

[0040] When the temperature value of the electrode remains unchanged or is decreasing / increasing, the data analysis unit sends a signal to the electrode control unit to reduce / increase the electrode height according to the ratio of the electrode temperature value to the middle value of the standard temperature range.

[0041] Compared with the prior art, the beneficial effect of the present invention is that the feeding speed is slow and the distribution of ore is uneven when feeding with a single material pipe. The new material cannot be evenly distributed, which affects the permeability of the furnace condition and restricts the release of the production capacity of the ore furnace and the further optimization of the indicators. The present invention first mixes the ore with the required materials such as coke and catalyst in the silo, and evenly adds the ore into the ore furnace through a number of troughs and material pipes, which ensures the uniformity of feeding and improves the stability of the production of the ore furnace.

[0042] Furthermore, if the height difference between the electrodes is too large, the insertion depth of the three-phase electrodes will be uneven, causing one phase electrode to be too long or too short, destroying the power balance of the three-phase electrodes and reducing the total power input into the furnace; if the working end of the electrode is too long, there will be too few electrodes, which is prone to electrode accidents, and the electrode inserted too deeply into the ore-heating furnace will damage the furnace bottom; if the working end of the electrode is too short, the thermal utilization rate will be reduced, the molten pool temperature will be lowered, and it will cause difficulty in tapping iron. The present invention detects whether one phase electrode of the three-phase electrodes is too long or too short by comparing the height difference between the electrodes with the height difference interval, judges the specific situation of the electrode height difference according to the comparison result, and takes corresponding adjustment measures according to different situations, thereby improving the power factor of the furnace transformer and improving the operating efficiency of the ore-heating furnace.

[0043] Furthermore, the degree of electrode consumption is directly related to the stability and production efficiency of the electric arc furnace. If the degree of electrode consumption is not predicted, it will have a serious impact on the operating parameters. The present invention predicts the degree of electrode consumption by calculating the electrode consumption rate, and adopts corresponding adjustment measures according to the degree of electrode consumption, thereby increasing the stability and production efficiency of the electric arc furnace production process.

[0044] Furthermore, in the actual production process, the value of the secondary current is tens of thousands or hundreds of thousands of amperes, and it is difficult to directly measure the specific value of the secondary current. There are many factors to consider in calculating the secondary current, so it is difficult to calculate an accurate value; in actual production, due to the unstable factors of the furnace condition, the primary side current fluctuates greatly, such as: sparks, slag turning, etc., and the probability of these situations occurring is relatively high; if the primary current is compared with a fixed value during the production process, it is easy to cause frequent electrode action, resulting in a more unstable load; the present invention compares the electrode temperature with the standard temperature range. When the temperature changes, the electrode will not be actuated as long as it does not exceed the standard temperature range. If it exceeds the standard temperature range, the electrode will be actuated accordingly to keep the load stable and maintain power stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 A unit connection diagram of an operation control system of a submerged arc furnace in an embodiment of the present invention;

[0046] Figure 2 It is a structural schematic diagram of an operation control system of a submerged arc furnace in an embodiment of the present invention;

[0047] Figure 3 It is a schematic diagram of a process of adjusting the electrode height according to the three-phase electrode height difference in an embodiment of the present invention;

[0048] Figure 4 A connection diagram of a unit for determining electrode current fluctuation according to electrode temperature in an embodiment of the present invention;

[0049] In the figure: 1-furnace transformer, 2-electrode control unit, 3-smoke recovery device, 4-furnace body, 5-discharging port, 6-ore material, 7-cooling device, 8-three-phase electrode, 9-material pipe, 10-material trough, 11-material silo, 12-material car. DETAILED DESCRIPTION

[0050] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0051] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0052] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0053] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0054] See also Figure 1 As shown, Figure 1 A unit connection diagram of an operation control system of a submerged arc furnace in an embodiment of the present invention; Figure 2 It is a structural schematic diagram of an operation control system of a submerged arc furnace in an embodiment of the present invention; Figure 3 It is a schematic diagram of a process of adjusting the electrode height according to the three-phase electrode height difference in an embodiment of the present invention; Figure 4 1 is a connection diagram of a unit for determining electrode current fluctuation according to electrode temperature in an embodiment of the present invention.

[0055] The present invention provides an operation control system of a submerged arc furnace, comprising:

[0056] A transformer controller, which is connected to the furnace transformer 1 and is used to adjust the gear of the secondary voltage by adjusting the coefficient of the furnace transformer 1 according to the signal of the data analysis unit;

[0057] The electrode control unit 2 is connected to the three-phase electrode 8 and is used to control the pressing and releasing and lifting of the electrode according to the signal of the data analysis unit. The three-phase electrode 8 is a direct device for directing the short-circuit current to the charge, and is composed of an electrode shell and an electrode paste. Since the end of the electrode is in direct contact with the charge, and a considerable part of the electrode is buried in the charge and is in the high temperature area like the charge, it will continue to melt. During the smelting process, the electrode paste should be regularly added from the top to press the electrode downward through the pressing and releasing action to supplement the electrode melting consumption, so as to ensure that the smelting process can be cyclically continuous;

[0058] A feeding unit, which is connected to the data analysis unit, comprises a mixing bin 11, a feed cart 12, a plurality of feed troughs 10 and a feed pipe 9, and is used to add the ore 6 into the submerged arc furnace according to the signal of the data analysis unit;

[0059] A detection unit, which is connected to the data analysis unit, includes a weight sensor, an ultrasonic detector and an infrared thermometer, and is used to detect the material surface height of the ore 6 in the furnace, the weight of the trough 10, the electrode height, the electrode thickness and the electrode temperature, and transmit the detection data to the data analysis unit;

[0060] A data analysis unit is used to determine the material trough 10 that needs to be charged based on the replenishment weight; calculate the material surface height difference of the ore 6 in the furnace, and transmit a signal to open and close the material trough 10 based on the comparison result of the material surface height difference and the material surface height difference evaluation value; calculate the height difference between the three-phase electrodes 8, and adjust the height of the three-phase electrode 8 based on the comparison result of the electrode height difference and the electrode height difference interval and the height of the electrode from the bottom of the ore furnace; judge the electrode consumption degree based on the electrode consumption speed, adjust the electrode control unit 2 to perform the electrode pressing and releasing cycle and the depth of the electrode inserted into the ore 6 in the furnace; draw a temperature change curve based on the electrode temperature, judge the volatility of the electrode current, and adjust the secondary voltage gear or the height of the electrode.

[0061] It can be understood that the submerged arc furnace is provided with a fume recovery device 3 and a cooling device 7 , and the furnace body 4 of the submerged arc furnace is provided with a discharge port 5 .

[0062] In this embodiment, before the ore-bearing furnace is started, the detection unit detects the weight carried by any trough 10 on the top of the ore-bearing furnace, and the data analysis unit compares the weight of any trough 10 with the replenishment weight.

[0063] If the weight of any trough 10 is greater than the replenishment weight, the data analysis unit determines that the mineral material 6 in the trough 10 is within the normal weight range;

[0064] If the weight of any trough 10 is less than or equal to the replenishment weight, the data analysis unit determines that the ore 6 in the trough 10 is less, sends a signal to the feeding unit, opens the furnace top mixing bin 11, controls the feed cart 12 to receive the material, and the feed cart 12 runs along the set track to the trough 10 to feed it;

[0065] The replenishment weight is the product of the full load weight of the trough 10 and the required feeding coefficient. In this embodiment, the required feeding coefficient is 0.6. The actual material surface height of the ore 6 in the ore arc furnace before feeding is less than the standard material surface height.

[0066] The detection unit detects the material surface height of the ore 6 in the ore arc furnace, the data analysis unit calculates the difference between the actual material surface height and the standard material surface height, and compares the material surface height difference with the material surface height difference evaluation value.

[0067] If the material surface height difference is less than or equal to the material surface height difference evaluation value, the data analysis unit determines that the difference between the material surface height of the ore 6 in the ore arc furnace and the standard material surface height is small and is within the normal production range;

[0068] If the material surface height difference is greater than the material surface height difference evaluation value, the data analysis unit determines that the material surface height of the ore 6 in the ore arc furnace is low, and the ore 6 in the ore arc furnace needs to be increased;

[0069] The data analysis unit transmits a signal to the feeding unit to open a plurality of feeding pipes 9 to feed the ore furnace evenly according to the ratio of the material surface height difference to the standard material surface height, and stops feeding when the material surface height of the ore 6 in the ore furnace is within the normal production range;

[0070] Among them, the normal production range is an interval consisting of the sum of the standard material surface height and the positive and negative material surface height difference evaluation values, and the material surface height difference evaluation value can be adjusted according to the specifications of the ore-fired furnace.

[0071] Specifically, a single material pipe 9 has the problem of slow feeding speed and uneven distribution of the ore 6. The new material cannot be evenly distributed, which affects the permeability of the furnace condition and restricts the release of the production capacity of the ore furnace and the further optimization of the indicators. The present invention first mixes the ore 6 with the required materials such as coke and catalyst in the silo 11, and evenly adds the ore 6 into the ore furnace through a plurality of troughs 10 and material pipes 9, thereby ensuring the uniformity of the feeding and improving the stability of the ore furnace production.

[0072] In this embodiment, the three-phase electrode 8 is divided into a first electrode, a second electrode and a third electrode, and the detection unit detects the first electrode height, the second electrode height and the third electrode height of the three-phase electrode 8, and the electrode height is the height of the vertex of the bottom end of the electrode from the ground;

[0073] The data analysis unit calculates a first height difference value according to the first electrode height and the second electrode height, calculates a second height difference value according to the second electrode height and the third electrode height, and calculates a third height difference value according to the first electrode height and the third electrode height;

[0074] The data analysis unit compares any height difference with the electrode height difference interval, wherein the electrode height difference interval consists of positive and negative maximum electrode height differences.

[0075] If any height difference does not fall within the electrode height difference interval, the data analysis unit determines that the height difference between two electrodes in the three-phase electrode 8 is too large, and adjusts the height of the two electrodes corresponding to any height difference according to the height comparison result of the two electrodes.

[0076] For example, when the first height difference is too large, if the first electrode height is greater than the second electrode height, the first electrode height is reduced and the second electrode height is increased, and the degree of reduction and increase of the electrode height is the same, and the degree of reduction and increase is positively correlated with the quotient of the electrode height difference and the maximum electrode height difference;

[0077] If the height difference between any two electrodes does not fall within the electrode height difference interval, the data analysis unit determines that the height of any electrode in the three-phase electrode 8 is too large or too small, and adjusts the height of the electrode corresponding to the height difference between any two electrodes according to the electrode height comparison result.

[0078] For example, when the first height difference and the second height difference are too large, if the second electrode height is greater than the heights of the other two electrodes, the second electrode height is reduced, and the degree of reduction is positively correlated with the quotient of the larger electrode height difference and the maximum electrode height difference;

[0079] In the process of adjusting the electrode height difference, the data analysis unit calculates the height of any electrode from the bottom of the submerged arc furnace according to the initial height of the three-phase electrode 8 and the descending length of any electrode, and compares the height of any electrode from the bottom of the submerged arc furnace with the critical height.

[0080] If the height of any electrode from the bottom of the ore-bearing furnace is less than the critical height, the data analysis unit determines that the electrode is inserted deeply into the ore-bearing furnace, and sends a signal to the electrode control unit 2 to raise the electrode;

[0081] In this embodiment, the critical height of the electrode is 0.8 times the diameter of the electrode.

[0082] Specifically, if the height difference between the electrodes is too large, the insertion depth of the three-phase electrode 8 will be uneven, making one phase electrode too long or too short, destroying the power balance of the three-phase electrode 8 and reducing the total power input into the furnace; if the working end of the electrode is too long, there will be too few electrodes, which is prone to electrode accidents, and the electrode inserted too deeply into the electric arc furnace will damage the furnace bottom; if the working end of the electrode is too short, the thermal utilization rate will be reduced, the molten pool temperature will be lowered, and it will cause difficulty in tapping iron. The present invention detects whether one phase electrode of the three-phase electrode 8 is too long or too short by comparing the height difference between the electrodes with the height difference interval, judges the specific situation of the electrode height difference according to the comparison result, and takes corresponding adjustment measures according to different situations, thereby improving the power factor of the furnace transformer 1 and improving the operating efficiency of the electric arc furnace.

[0083] The detection unit uses an ultrasonic detector to detect the electrode thickness, which is the thickness of the electrode paste in the electrode shell. The data analysis unit calculates the electrode consumption rate according to the change in electrode thickness per unit time, and determines the electrode consumption degree according to the electrode consumption rate.

[0084] If the electrode consumption rate is greater than the standard electrode consumption rate, the data analysis unit determines that the electrode consumption rate is faster, and reduces the electrode pressing and releasing cycle of the electrode control unit 2 according to the ratio of the electrode consumption rate to the standard electrode consumption rate;

[0085] If the electrode consumption rate is lower than the standard electrode consumption rate, the data analysis unit calculates the speed difference between the electrode consumption rate and the standard electrode consumption rate.

[0086] If the speed difference between the electrode consumption speed and the standard electrode consumption speed is greater than the speed difference evaluation value, the data analysis unit determines that the electrode consumption speed is too small, and sends a signal to the electrode control unit 2 to lower the electrode according to the ratio of the speed difference to the speed difference evaluation value, thereby increasing the depth of the electrode inserted into the ore 6 in the furnace;

[0087] The standard electrode consumption rate is the electrode consumption rate when the electrode temperature is within the standard temperature range, and the speed difference evaluation value is 0.1 times the standard electrode consumption rate.

[0088] Specifically, the degree of electrode consumption is directly related to the stability and production efficiency of the electric arc furnace. If the degree of electrode consumption is not predicted, it will have a serious impact on the operating parameters. The present invention predicts the degree of electrode consumption by calculating the electrode consumption rate, and adopts corresponding adjustment measures according to the degree of electrode consumption, thereby increasing the stability and production efficiency of the electric arc furnace production process.

[0089] Those skilled in the art can find out the electrode working height range and primary current corresponding to the stage of good furnace condition from the historical curve, use them as the setting values ​​of electrode position and primary current, and confirm the standard temperature range of electrode temperature.

[0090] After the electrode position and the primary current are confirmed, the detection unit detects the electrode temperature through an infrared temperature meter, and the data analysis unit draws a temperature change curve according to the electrode temperature and obtains the derivative function of the temperature change curve;

[0091] If the temperature value of the temperature change curve at any time exceeds the standard temperature range, the data analysis unit determines its change trend according to the derivative function of the temperature change curve.

[0092] If the temperature value of the temperature change curve at any time is higher than the standard temperature range, and the value of the derivative function at any time is greater than zero, the data analysis unit determines that the temperature value of the electrode is still rising continuously, and the current in the electrode fluctuates greatly, and the transformer controller reduces the secondary voltage gear by adjusting the coefficient of the furnace transformer 1;

[0093] Wherein, if the value of the derivative function at any time is less than or equal to zero, the data analysis unit determines that the temperature value of the electrode remains unchanged or is decreasing, and the data analysis unit sends a signal to the electrode control unit 2 to reduce the electrode height according to the ratio of the electrode temperature value to the middle value of the standard temperature range;

[0094] If the temperature value of the temperature change curve at any time is lower than the standard temperature range, and the value of the derivative function at any time is less than zero, the data analysis unit determines that the temperature value of the electrode is still continuously decreasing, and the current in the electrode fluctuates greatly, and the transformer controller increases the secondary voltage level by adjusting the coefficient of the furnace transformer 1;

[0095] Among them, if the value of the derivative function is greater than or equal to zero at any time, the data analysis unit determines that the temperature value of the electrode remains unchanged or is rising, and the data analysis unit sends a signal to the electrode control unit 2 to increase the electrode height according to the ratio of the electrode temperature value to the middle value of the standard temperature range.

[0096] Specifically, in the actual production process, the value of the secondary current is tens of thousands or hundreds of thousands of amperes. It is difficult to directly measure the specific value of the secondary current, and there are many factors to consider in calculating the secondary current, so it is difficult to calculate an accurate value; in actual production, due to the unstable factors of the furnace condition, the primary side current fluctuates greatly, such as: sparks, slag turning, etc., and the probability of these situations occurring is relatively high; if the primary current is compared with a fixed value during the production process, it is easy to cause frequent electrode action, resulting in a more unstable load; the present invention compares the electrode temperature with the standard temperature range. When the temperature changes, the electrode will not be actuated as long as it does not exceed the standard temperature range. If it exceeds the standard temperature range, the electrode will be actuated accordingly to keep the load stable and maintain power stability.

[0097] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

[0098] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An operation control system of a submerged arc furnace, characterized in that: include, A transformer controller, which is connected to the furnace transformer and is used to adjust the gear of the secondary voltage by adjusting the furnace transformer coefficient according to the signal of the data analysis unit; An electrode control unit, which is connected to the three-phase electrode and is used to control the pressing, releasing and lifting of the electrode according to the signal of the data analysis unit; A feeding unit, which is connected to the data analysis unit and includes a mixing bin, a feed cart, and a plurality of feed troughs and feed pipes, and is used to add ore into the submerged arc furnace according to the signal of the data analysis unit; A detection unit, which is connected to the data analysis unit, includes a weight sensor, an ultrasonic detector and an infrared thermometer, and is used to detect the material surface height, material trough weight, electrode height, electrode thickness and electrode temperature of the ore in the furnace, and transmit the detection data to the data analysis unit; A data analysis unit is used to determine the material trough that needs to be charged based on the replenishment weight; calculate the material surface height difference of the ore in the furnace, and transmit the signal for opening and closing the material trough based on the comparison result of the material surface height difference and the material surface height difference evaluation value; calculate the height difference between the three-phase electrodes, and adjust the height of the three-phase electrodes based on the comparison result of the electrode height difference and the electrode height difference interval and the height of the electrode from the bottom of the ore furnace; judge the electrode consumption degree based on the electrode consumption speed, adjust the electrode control unit to perform the electrode pressing and releasing cycle and the depth of the electrode inserted into the ore in the furnace; draw a temperature change curve based on the electrode temperature, judge the volatility of the electrode current, and adjust the secondary voltage gear or the height of the electrode.

2. The operation control system of the submerged arc furnace according to claim 1, characterized in that: Before the submerged arc furnace is started, the detection unit detects the weight carried by any material trough on the top of the submerged arc furnace, and the data analysis unit compares the weight of any material trough with the replenishment weight. If the weight of any trough is less than or equal to the replenishment weight, the data analysis unit determines that there is less ore in the trough, sends a signal to the feeding unit, opens the furnace top mixing silo, controls the feed car to receive the material, and the feed car runs along the set track to the trough to feed it; Among them, the replenishment weight is the product of the full load weight of the material trough and the required feeding coefficient. The actual material surface height of the ore in the electric arc furnace before feeding is less than the standard material surface height.

3. The operation control system of the submerged arc furnace according to claim 1, characterized in that: The data analysis unit calculates the difference between the actual material surface height detected by the detection unit and the standard material surface height, and compares the material surface height difference with the material surface height difference evaluation value. If the material surface height difference is greater than the material surface height difference evaluation value, the data analysis unit determines that the material surface height of the ore in the ore furnace is low, and the data analysis unit transmits a signal to the feeding unit to open the feeding pipe according to the ratio of the material surface height difference to the standard material surface height to uniformly feed the ore furnace, and stops feeding when the material surface height of the ore in the ore furnace is within the normal production range; Among them, the normal production range is an interval consisting of the sum of the standard material surface height and the positive and negative material surface height difference evaluation values, and the material surface height difference evaluation value can be adjusted according to the specifications of the ore-fired furnace.

4. The operation control system of the submerged arc furnace according to claim 1, characterized in that: The detection unit detects the first electrode height, the second electrode height and the third electrode height of the three-phase electrode, the data analysis unit calculates a first height difference value according to the first electrode height and the second electrode height, calculates a second height difference value according to the second electrode height and the third electrode height, calculates a third height difference value according to the first electrode height and the third electrode height, and compares any height difference value with the electrode height difference value interval, If any height difference value does not fall within the electrode height difference value interval, the data analysis unit determines that the height difference value between two electrodes corresponding to any height difference value in the three-phase electrodes is too large; If the height difference between any two electrodes does not fall within the electrode height difference interval, the data analysis unit determines that the height of the electrode corresponding to the height difference between any two electrodes in the three-phase electrodes is too large or too small; The electrode height is the height of the bottom vertex of the electrode from the ground, and the electrode height difference range consists of positive and negative maximum electrode height differences.

5. The operation control system of the submerged arc furnace according to claim 4, characterized in that: When the height difference between two electrodes corresponding to any height difference among the three-phase electrodes is too large, the data analysis unit compares the heights of the two electrodes, and increases or decreases the heights of the two electrodes according to the comparison result, and the degree of decrease and increase is positively correlated with the quotient of the electrode height difference and the maximum electrode height difference; When the height of the electrode corresponding to any two electrode height differences in the three-phase electrodes is too large or too small, the data analysis unit increases or decreases the height of the corresponding electrode, and the degree of decrease is positively correlated with the quotient of the larger electrode height difference and the maximum electrode height difference.

6. The operation control system of the submerged arc furnace according to claim 5, characterized in that: During the adjustment of the electrode height difference, the data analysis unit calculates the height of any electrode from the bottom of the submerged arc furnace according to the initial height of the three-phase electrode and the descending length of any electrode, and compares the height of any electrode from the bottom of the submerged arc furnace with the critical height. If the height of any electrode from the bottom of the submerged arc furnace is less than the critical height, the data analysis unit determines that the electrode is inserted deeply into the submerged arc furnace and sends a signal to the electrode control unit to raise the electrode.

7. The operation control system of the submerged arc furnace according to claim 1, characterized in that: The detection unit uses an ultrasonic detector to detect the electrode thickness, which is the thickness of the electrode paste in the electrode shell. The data analysis unit calculates the electrode consumption rate according to the change in electrode thickness per unit time, and compares the electrode consumption rate with the standard electrode consumption rate. If the electrode consumption rate is greater than the standard electrode consumption rate, the data analysis unit determines that the electrode consumption rate is faster; If the electrode consumption speed is lower than the standard electrode consumption speed, the data analysis unit calculates the speed difference between the electrode consumption speed and the standard electrode consumption speed. If the speed difference between the electrode consumption speed and the standard electrode consumption speed is greater than the speed difference evaluation value, the data analysis unit determines that the electrode consumption speed is slow; The standard electrode consumption rate is the electrode consumption rate when the electrode temperature is within the standard temperature range.

8. The operation control system of the submerged arc furnace according to claim 7, characterized in that: When the electrode consumption rate is fast, the data analysis unit reduces the electrode pressing and releasing cycle of the electrode control unit according to the ratio of the electrode consumption rate to the standard electrode consumption rate; When the electrode consumption speed is slow, the data analysis unit sends a signal to the electrode control unit to lower the electrode according to the ratio of the speed difference value to the speed difference evaluation value, thereby increasing the depth of the electrode inserted into the ore in the furnace.

9. The operation control system of the submerged arc furnace according to claim 1, characterized in that: The detection unit detects the electrode temperature through an infrared temperature meter, and the data analysis unit draws a temperature change curve according to the electrode temperature and obtains a derivative function of the temperature change curve; If the temperature value of the temperature change curve at any time exceeds the standard temperature range, the data analysis unit determines its change trend according to the derivative function of the temperature change curve. If the temperature value of the temperature change curve at any time is higher than the standard temperature range, and the value of the derivative function is greater than zero, the data analysis unit determines that the temperature value of the electrode is still rising continuously, and the current in the electrode fluctuates greatly. Wherein, if the value of the derivative function at any time is less than or equal to zero, the data analysis unit determines that the temperature value of the electrode remains unchanged or is decreasing; If the temperature value of the temperature change curve at any time is lower than the standard temperature range, and the value of the derivative function is less than zero, the data analysis unit determines that the temperature value of the electrode is still continuously decreasing, and the current in the electrode fluctuates greatly. If the value of the derivative function at any time is greater than or equal to zero, the data analysis unit determines that the temperature value of the electrode remains unchanged or is rising.

10. The operation control system of the submerged arc furnace according to claim 9, characterized in that: When the current in the electrode fluctuates greatly and the temperature of the electrode continues to rise or fall, the transformer controller reduces or increases the secondary voltage level by adjusting the furnace transformer coefficient; When the temperature value of the electrode remains unchanged or is decreasing / increasing, the data analysis unit sends a signal to the electrode control unit to reduce / increase the electrode height according to the ratio of the electrode temperature value to the middle value of the standard temperature range.

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