CN110285667B - Automatic control system and control method of direct current electric arc furnace - Google Patents
Automatic control system and control method of direct current electric arc furnace Download PDFInfo
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Abstract
The invention discloses an automatic control system of a direct current electric arc furnace and a control method thereof. Collecting voltage values between a cathode electrode and an anode electrode in a furnace body of the direct current electric arc furnace, and calculating a difference value between the voltage values and a preset voltage value to control the electrode lifting device to lift so as to adjust the voltage value; collecting the temperature in the furnace, and calculating the difference value between the temperature in the furnace and the preset temperature to control the current of the direct current power supply; the temperature of the material flowing out of the discharge port is collected, and the feeding quantity is controlled by calculating and presetting the temperature difference. The invention adopts different control parameters to correct voltage, electric arc, feeding speed and the like, avoids the cross influence of the factors and realizes the full-automatic control of the direct-current electric arc furnace.
Description
Technical Field
The invention relates to an automatic control system and a control method thereof, in particular to an automatic control system of a direct current electric arc furnace and a control method thereof.
Background
In a dc arc furnace, an electric arc is generated between a hearth electrode (anode) and a graphite electrode (cathode) on a metal charge for smelting. The main difference between the DC arc furnace and the AC arc furnace is that a rectifying device is added, the graphite electrodes on the furnace top are changed into one electrode from three, a furnace bottom electrode is added, and the like. Wherein the arrangement of the bottom electrode is the biggest characteristic of the direct current electric arc furnace. The main advantages of a dc arc furnace are: the electric arc is stable and centralized, the molten pool is well stirred, the temperature in the furnace is uniformly distributed, and the erosion amount of the furnace lining is small; the current and voltage fluctuation is small, the impact on a power grid is reduced, and the service life of the cable is prolonged; the electrode consumption is less, and the electrode consumption per ton of material is 50 percent less than that of an alternating current electric arc furnace. However, during the operation of the dc arc furnace, the operating parameters of the dc arc furnace are affected by the feed rate and the output power (including voltage and current) of the arc. Because the voltage and the current are mutually coupled and influenced, once working condition fluctuation occurs in the running process of the direct-current electric arc furnace, the working condition can be only slowly adjusted according to experience, and the realization of automatic control is difficult.
When the direct current electric arc furnace is operated, the resistance value between the positive electrode and the negative electrode is positively correlated with the distance between the positive electrode and the negative electrode. The larger the distance between the cathode and the anode, the larger the arc resistance value between the cathode and the anode. Therefore, the general automatic control method of the dc arc furnace mainly controls the power supply and the lifting device (CN 101782321A-an automatic electrode adjusting device of the dc arc furnace and its control method), and there are two main control methods:
1. the constant voltage control method sets the power supply voltage as a fixed value, and when the current fluctuates and becomes larger, the actual voltage U = I R between the cathode and the anode is larger than the set voltage value. At this time, the automatic control system lowers the cathode electrode to reduce the resistance value, so that the actual voltage value is recovered to the set value. On the contrary, when the current fluctuation is reduced, the actual voltage U = I × R between the cathode and the anode is smaller than the set voltage value. At this time, the automatic control system raises the cathode electrode to raise the resistance value, so that the actual voltage value is restored to the set value.
2. Constant current control method: the power supply current is set to be a fixed value, and when the voltage fluctuates and becomes large, the actual current I = U/R between the cathode and the anode is larger than the set current value. At this time, the automatic control system raises the cathode electrode to raise the resistance value, so that the actual current value is restored to the set value. And conversely, when the voltage fluctuation is reduced, the actual current I = U/R between the cathode and the anode is smaller than the set current value. At this time, the automatic control system lowers the cathode electrode to reduce the resistance value, so that the actual current value is restored to the set value.
The two traditional control methods are limited in that the control method can only adjust the parameter fluctuation of the power supply (current and voltage) and cannot automatically respond to parameters such as furnace temperature, slag discharge temperature and the like. In essence, only automatic control of the power supply and the electrode lifting device is possible, not of the dc arc furnace as a whole. However, in the actual operation process, both the feeding speed and the deslagging temperature have influence on the operation condition of the direct-current arc furnace. By adopting the traditional control method, the fluctuation of the parameters can be judged only by operators according to experience and manually adjusted, but the automation degree of the equipment is actually reduced.
Disclosure of Invention
The technical problem to be solved by the invention is to provide an automatic control system and a control method of a direct current electric arc furnace, and the full automatic control of the direct current electric arc furnace is realized.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
an automatic control system of a direct current electric arc furnace is characterized in that: comprises a direct current arc furnace body, an in-furnace infrared temperature measuring device, a cathode electrode, an electrode lifting device, an in-furnace temperature control sensor, power supply equipment, a voltage control sensor, an anode electrode, a discharge temperature control sensor, a discharge infrared temperature measuring device and a feeding control device, wherein the cathode electrode is vertically arranged at the upper end of the direct current arc furnace body, the anode electrode is arranged on the electrode lifting device and is driven by the electrode lifting device to lift up and down in the direct current arc furnace body, the voltage control sensor is connected with the cathode electrode and the anode electrode for measuring the voltage value between the electrodes, the voltage control sensor is connected with the electrode lifting device for sending a lifting control signal, the in-furnace infrared temperature measuring device is fixed at the upper end of the direct current arc furnace body, the in-furnace infrared temperature measuring device is connected with the in-furnace temperature control sensor, power supply unit is connected with negative pole electrode and positive pole electrode and is used for supplying power for the electrode, and the temperature control sensor is connected with power supply unit in the stove and is used for sending current control signal, and feed control device sets up the feed inlet in direct current arc furnace body upper end, arranges material infrared temperature measuring device and sets up in direct current arc furnace body side discharge gate position and arrange material infrared temperature measuring device and arrange material temperature control sensor and be connected and be used for gathering the material temperature that the discharge gate flows and send for arranging material temperature control sensor, arrange material temperature control sensor and be connected with feed control device and be used for sending feed control signal.
Further, the in-furnace temperature control sensor comprises an in-furnace temperature DCS, an in-furnace temperature operation module and a power supply current control signal triggering module, the in-furnace temperature DCS is connected with the in-furnace infrared temperature measuring device and used for comparing the in-furnace molten pool temperature acquired by the in-furnace infrared temperature measuring device with the preset molten pool temperature of the in-furnace DCS, the in-furnace temperature operation module is connected with the in-furnace temperature DCS and used for calculating the difference value between the acquired in-furnace molten pool temperature and the preset molten pool temperature of the in-furnace DCS, and the power supply current control signal triggering module is connected with the in-furnace temperature operation module and used for generating a voltage control signal of the direct-current power supply according to the.
Further, the voltage control sensor comprises a voltage measurement module, a voltage DCS, a voltage operation module and a lifting control signal triggering module, wherein the voltage measurement module is connected with a cathode electrode and an anode electrode and used for acquiring a voltage value between the electrodes, the voltage DCS is connected with the voltage measurement module and used for comparing the acquired voltage value between the electrodes with a preset voltage value of the voltage DCS, the voltage operation module is connected with the voltage DCS and used for calculating a difference value between the acquired voltage value and the preset voltage value, and the lifting control signal triggering module is connected with the voltage operation module and used for generating a control signal of the electrode lifting device through the voltage difference value acquired by the voltage operation module and sending the control signal to the electrode lifting device.
Further, arrange material temperature control sensor and contain row material temperature DCS, arrange material temperature operation module and feeding control signal trigger module, arrange material temperature DCS and arrange material infrared temperature measuring device and be connected and be used for arranging the material temperature that the discharge gate that material infrared temperature measuring device gathered flows and arrange the preset material temperature contrast of material DCS, arrange material temperature operation module and arrange material temperature DCS and be connected the difference that is used for calculating the material temperature that the discharge gate that gathers flows and arrange the preset material temperature of material DCS, feeding control signal trigger module is connected with row material temperature operation module and is used for calculating the feeding control signal that obtains according to arranging the difference that material temperature operation module and generating feeding control device and sending for feeding control device.
An automatic control method of a direct current electric arc furnace is characterized by comprising the following steps:
voltage regulation: collecting voltage values between a cathode electrode and an anode electrode in a furnace body of the direct current electric arc furnace, comparing the collected voltage values with a preset voltage value, calculating a difference value, and controlling the electrode lifting device to lift through the difference value to adjust the voltage value;
adjusting the temperature in the furnace: acquiring the temperature in the furnace, comparing the acquired temperature with a preset temperature, calculating a difference value and controlling the current of the direct current power supply through the difference value;
discharge temperature adjustment: the material temperature that the bin outlet flows is gathered to will gather the temperature and predetermine the temperature contrast, calculate the difference and control the feed volume through the difference.
Further, the voltage regulation is specifically that a voltage control sensor is arranged between a cathode electrode and an anode electrode of a furnace body of the direct current electric arc furnace, a voltage measurement module of the voltage control sensor acquires a voltage value between the cathode electrode and the anode electrode in real time, the voltage DCS compares the acquired voltage value between the electrodes with a preset voltage value of the voltage DCS, then a difference value between the acquired voltage value between the electrodes and the preset voltage value is calculated through a voltage operation module, a lifting control signal triggering module generates a control signal of an electrode lifting device through the voltage difference value acquired by the voltage operation module and sends the control signal to an electrode lifting device, the electrode lifting device carries out lifting regulation on the height of the cathode electrode through an internal actuator after receiving the control signal, so as to cause the change of the arc length between the cathode electrode and the anode electrode, and further regulate the actually measured voltage between the cathode electrode and the anode electrode, so that it eventually approaches the voltage preset value.
Further, the temperature regulation in the furnace is specifically that an in-furnace infrared temperature measuring device is arranged at the upper end of a furnace body of the direct current arc furnace to collect the temperature of a molten pool in the furnace in real time, the temperature DCS in the furnace compares the collected temperature of the molten pool with the temperature of the molten pool preset by the temperature DCS in the furnace, a temperature operation module in the furnace calculates the difference value between the collected temperature of the molten pool in the furnace and the temperature of the molten pool preset by the temperature DCS in the furnace, a power supply current control signal trigger module generates a voltage control signal of the direct current power supply according to the difference value calculated by the temperature operation module in the furnace and sends the voltage control signal to the direct current power supply, and after receiving the voltage control signal, the direct current power supply equipment adjusts.
Further, the discharging temperature adjustment is characterized in that a feeding control device is arranged at a feeding port of a furnace body of the direct current electric arc furnace, a discharging infrared temperature measuring device is arranged at a discharging port on the side surface of the furnace body of the direct current electric arc furnace and collects the temperature of the material flowing out of the discharging port in real time, a discharging temperature DCS compares the temperature of the material flowing out of the discharging port collected by the discharging infrared temperature measuring device with the preset temperature of the material collected by the discharging DCS, a discharging temperature operation module calculates the difference between the temperature of the material flowing out of the discharging port and the preset temperature of the material collected by the discharging temperature operation module, a feeding control signal triggering module generates a feeding control signal of the feeding control device according to the difference calculated by the discharging temperature operation module and sends the feeding control signal to the feeding control device, and the feeding control device adjusts the feeding speed of the raw material, the effect of controlling the discharged materials is achieved.
Compared with the prior art, the invention has the following advantages and effects:
1. the invention avoids cross-effects between different control parameters. In direct current arc furnaces, the temperature of the molten bath is an important process parameter. In the existing control mode of the direct current arc furnace, the direct current power supply equipment needs to adjust the voltage and the current at the same time, and the adjustment of the voltage and the current affects the magnitude of the output power of the power supply. And the output power of the power supply directly influences the temperature of the molten pool. Meanwhile, because the raw materials are put into the molten pool and endothermic reaction needs to occur, the feeding speed also influences the temperature of the molten pool. In the event of fluctuations in the bath temperature of the direct-current arc furnace, it is often not known whether the feed rate, the supply voltage or the current are to be set. Generally, an operator is required to perform manual operation adjustment according to experience judgment. By adopting the control method, the three parameters of the feeding speed, the voltage and the current are decoupled from each other, the control logics are independent from each other and are not conflicted, the automatic control can be effectively realized, and the manual intervention is reduced;
2. the invention can make full use of the existing equipment and instruments of the direct current electric arc furnace, and has low operation cost. In the direct current electric arc furnace, a molten pool temperature measuring device and a cathode and anode voltage measuring device are frequently used equipment instruments. The invention adopts the output signals of the common devices as the control signal source, does not need to additionally add devices, and does not bring larger cost burden no matter a newly built direct current electric arc furnace or the reconstruction of the existing direct current electric arc furnace.
Drawings
Fig. 1 is a schematic view of an automatic control system for a dc arc furnace of the present invention.
Fig. 2 is a schematic diagram of an automatic control method of a dc electric arc furnace of the present invention.
Detailed Description
The present invention is further illustrated by the following examples, which are illustrative of the present invention and are not to be construed as being limited thereto.
As shown in figure 1, the automatic control system of a direct current electric arc furnace of the invention comprises a direct current electric arc furnace body 1, an in-furnace infrared temperature measuring device 2, a cathode electrode 3, an electrode lifting device 4, an in-furnace temperature control sensor 5, a power supply device 6, a voltage control sensor 7, an anode electrode 8, a discharge temperature control sensor 9, a discharge infrared temperature measuring device 10 and a feeding control device 11, wherein the anode electrode 8 is vertically arranged at the upper end of the direct current electric arc furnace body 1, the cathode electrode 3 is arranged on the electrode lifting device 4 and is driven by the electrode lifting device 4 to lift up and down in the direct current electric arc furnace body, the anode electrode 8 is fixed at the lower end of the direct current electric arc furnace body 1, the voltage control sensor 7 is connected with the cathode electrode 3 and the anode electrode 8 for measuring the voltage value between the electrodes, the voltage control sensor 7 is connected with the electrode lifting device, the in-furnace infrared temperature measuring device 2 is fixed at the upper end of the direct current electric arc furnace body 1, the in-furnace infrared temperature measuring device 2 is connected with the in-furnace temperature control sensor 5 and is used for collecting the temperature of a molten pool in the furnace and sending the temperature to the in-furnace temperature control sensor 5, the power supply equipment 6 is connected with the cathode electrode 3 and the anode electrode 8 and is used for supplying power to the electrodes, the in-furnace temperature control sensor 5 is connected with the power supply equipment 6 and is used for sending current control signals, the feeding control device 11 is arranged at a feed inlet at the upper end of the direct current electric arc furnace body 1, the discharging infrared temperature measuring device 10 is arranged at a discharge outlet at the side of the direct current electric arc furnace body 1, the discharging infrared temperature measuring device 10 is connected with the discharging temperature control sensor 9 and is used for collecting the temperature of.
The temperature control sensor 5 in the furnace comprises a furnace temperature DCS, a furnace temperature operation module and a power supply current control signal trigger module, the furnace temperature DCS is connected with the furnace infrared temperature measuring device and used for comparing the temperature of a molten pool in the furnace, which is acquired by the furnace infrared temperature measuring device, with the temperature of a molten pool in the furnace, the furnace temperature operation module is connected with the furnace temperature DCS and used for calculating the difference value between the acquired temperature of the molten pool in the furnace and the temperature of the molten pool in the furnace, and the power supply current control signal trigger module is connected with the furnace temperature operation module and used for generating a voltage control signal of a direct-current power supply according to the difference value calculated by the furnace temperature operation module.
The voltage control sensor 7 comprises a voltage measuring module, a voltage DCS, a voltage operation module and a lifting control signal triggering module, wherein the voltage measuring module is connected with a cathode electrode and an anode electrode and used for acquiring voltage values between the electrodes, the voltage DCS is connected with the voltage measuring module and used for comparing the acquired voltage values between the electrodes with preset voltage values of the voltage DCS, the voltage operation module is connected with the voltage DCS and used for calculating difference values between the acquired voltage values and the preset voltage values, and the lifting control signal triggering module is connected with the voltage operation module and used for generating control signals of the electrode lifting device through the voltage difference values acquired by the voltage operation module and sending the control signals to the electrode lifting device.
Arrange material temperature control sensor 9 and contain row material temperature DCS, arrange material temperature operation module and feeding control signal trigger module, it is used for discharging the material temperature that the discharge gate that material infrared temperature measuring device gathered flows and arrange the preset material temperature contrast of material DCS to arrange material temperature DCS and arrange material temperature that material infrared temperature measuring device is connected, it is used for calculating the difference of the material temperature that the discharge gate that gathers flows and arrange the preset material temperature of material DCS to arrange material temperature operation module and row material temperature DCS to arrange material temperature operation module, feeding control signal trigger module and row material temperature operation module are connected and are used for generating feeding control device's feeding control signal and send for feeding control device according to the difference that row material temperature operation module calculated.
An automatic control method of a direct current electric arc furnace comprises the following steps:
voltage regulation: collecting voltage values between a cathode electrode and an anode electrode in a furnace body of the direct current electric arc furnace, comparing the collected voltage values with a preset voltage value, calculating a difference value, and controlling the electrode lifting device to lift through the difference value to adjust the voltage value;
the method comprises the steps that a voltage control sensor is arranged between a cathode electrode and an anode electrode of a furnace body of a direct current electric arc furnace, a voltage measurement module of the voltage control sensor collects a voltage value between the cathode electrode and the anode electrode in real time, a voltage DCS compares the collected voltage value between the electrodes with a preset voltage value of the voltage DCS, then a voltage operation module calculates a difference value between the collected voltage value between the electrodes and the preset voltage value, a lifting control signal trigger module generates a control signal of an electrode lifting device through the voltage difference value obtained by the voltage operation module and sends the control signal to an electrode lifting device, the electrode lifting device carries out lifting adjustment on the height of the cathode electrode through an internal actuator after receiving the control signal to cause the change of the arc length between the cathode electrode and the anode electrode, so that the measured voltage between the cathode electrode and the anode electrode is adjusted to finally approach to the preset voltage value, the effect of stabilizing the voltage is achieved.
Adjusting the temperature in the furnace: acquiring the temperature in the furnace, comparing the acquired temperature with a preset temperature, calculating a difference value and controlling the current of the direct current power supply through the difference value;
the temperature control device comprises a furnace body, a furnace temperature sensor, a power supply current control signal trigger module, a DC power supply device, an internal executor, an internal temperature measuring device, a temperature control signal acquisition module, a temperature control signal generation module, a DC power supply device and a control module.
Discharge temperature adjustment: the material temperature that the bin outlet flows is gathered to will gather the temperature and predetermine the temperature contrast, calculate the difference and control the feed volume through the difference.
Specifically, a feeding control device is arranged at a feeding port of a furnace body of the direct current electric arc furnace, a discharging infrared temperature measuring device is arranged at a discharging port on the side surface of the furnace body of the direct current electric arc furnace and is used for collecting the temperature of a material flowing out of the discharging port in real time, a discharging temperature DCS is used for comparing the temperature of the material flowing out of the discharging port collected by the discharging infrared temperature measuring device with the preset temperature of the material collected by the discharging DCS, a discharging temperature operation module is used for calculating the difference value between the temperature of the material flowing out of the discharging port collected by the discharging temperature operation module and the preset temperature of the material collected by the discharging DCS, a feeding control signal trigger module is used for generating a feeding control signal, the feeding speed of the raw materials is adjusted through the internal actuator, so that the average time of the raw materials staying in the molten pool is prolonged or shortened, and the effect of controlling the discharged materials is achieved.
The three steps have no absolute sequence, can be carried out simultaneously, and can also be controlled independently. The influence factors of the furnace temperature such as feeding speed, voltage, current and the like are decoupled from each other by analyzing the influence factors of various control parameters in the running process of the direct-current electric arc furnace. The voltage, the electric arc, the feeding speed and the like are corrected by adopting different control parameters, so that the cross influence of the factors is avoided, and the full-automatic control of the direct-current electric arc furnace can be realized.
The invention avoids cross-effects between different control parameters. In direct current arc furnaces, the temperature of the molten bath is an important process parameter. In the existing control mode of the direct current arc furnace, the direct current power supply equipment needs to adjust the voltage and the current at the same time, and the adjustment of the voltage and the current affects the magnitude of the output power of the power supply. And the output power of the power supply directly influences the temperature of the molten pool. Meanwhile, because the raw materials are put into the molten pool and endothermic reaction needs to occur, the feeding speed also influences the temperature of the molten pool. In the event of fluctuations in the bath temperature of the direct-current arc furnace, it is often not known whether the feed rate, the supply voltage or the current are to be set. Generally, an operator is required to perform manual operation adjustment according to experience judgment. By adopting the control method, the three parameters of the feeding speed, the voltage and the current are decoupled from each other, the control logics are independent from each other and are not conflicted, the automatic control can be effectively realized, and the manual intervention is reduced;
the invention can make full use of the existing equipment and instruments of the direct current electric arc furnace, and has low operation cost. In the direct current electric arc furnace, a molten pool temperature measuring device and a cathode and anode voltage measuring device are frequently used equipment instruments. The invention adopts the output signals of the common devices as the control signal source, does not need to additionally add devices, and does not bring larger cost burden no matter a newly built direct current electric arc furnace or the reconstruction of the existing direct current electric arc furnace.
The above description of the present invention is intended to be illustrative. Various modifications, additions and substitutions for the specific embodiments described may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.
Claims (4)
1. An automatic control method of a direct current electric arc furnace is characterized by comprising the following steps:
the automatic control system of the direct current electric arc furnace comprises a direct current electric arc furnace body, an in-furnace infrared temperature measuring device, a cathode electrode, an electrode lifting device, an in-furnace temperature control sensor, power supply equipment, a voltage control sensor, an anode electrode, a discharge temperature control sensor, a discharge infrared temperature measuring device and a feeding control device, wherein the cathode electrode is vertically arranged at the upper end of the direct current electric arc furnace body, the anode electrode is arranged on the electrode lifting device and is driven by the electrode lifting device to lift up and down in the direct current electric arc furnace body, the voltage control sensor is connected with the cathode electrode and the anode electrode for measuring the voltage value between the electrodes, the voltage control sensor is connected with the electrode lifting device for sending a lifting control signal, the in-furnace infrared temperature measuring device is fixed at the upper end of the direct current electric arc furnace body, the in-furnace infrared temperature measuring device is connected, the device comprises a power supply device, a feeding control device, a discharging infrared temperature measuring device, a discharging temperature control sensor and a discharging temperature control sensor, wherein the power supply device is connected with a cathode electrode and an anode electrode and used for supplying power to the electrodes;
the temperature control sensor in the furnace comprises a furnace temperature DCS, a furnace temperature operation module and a power supply current control signal triggering module, wherein the furnace temperature DCS is connected with the furnace infrared temperature measuring device and used for comparing the temperature of a molten pool in the furnace, which is acquired by the furnace infrared temperature measuring device, with the temperature of a molten pool in the furnace, which is preset by the furnace DCS, the furnace temperature operation module is connected with the furnace temperature DCS and used for calculating the difference value between the acquired temperature of the molten pool in the furnace and the preset temperature of the molten pool in the furnace, and the power supply current control signal triggering module is connected with the furnace temperature operation module and used for generating a voltage control signal of a direct-current power supply according to the; the voltage control sensor comprises a voltage measurement module, a voltage DCS, a voltage operation module and a lifting control signal triggering module, wherein the voltage measurement module is connected with a cathode electrode and an anode electrode and used for acquiring a voltage value between the electrodes, the voltage DCS is connected with the voltage measurement module and used for comparing the acquired voltage value between the electrodes with a preset voltage value of the voltage DCS, the voltage operation module is connected with the voltage DCS and used for calculating a difference value between the acquired voltage value between the electrodes and the preset voltage value, and the lifting control signal triggering module is connected with the voltage operation module and used for generating a control signal of the electrode lifting device through the voltage difference value acquired by the voltage operation module and sending the control signal to the electrode lifting device; the discharging temperature control sensor comprises a discharging temperature DCS, a discharging temperature operation module and a feeding control signal triggering module, the discharging temperature DCS is connected with the discharging infrared temperature measuring device and used for comparing the temperature of the material flowing out of the discharging port and collected by the discharging infrared temperature measuring device with the preset material temperature of the discharging DCS, the discharging temperature operation module is connected with the discharging temperature DCS and used for calculating the difference value between the collected temperature of the material flowing out of the discharging port and the preset material temperature of the discharging DCS, and the feeding control signal triggering module is connected with the discharging temperature operation module and used for generating a feeding control signal of the feeding control device according to the difference value calculated by the discharging temperature operation module and sending the feeding control signal to the feeding control device;
voltage regulation: collecting voltage values between a cathode electrode and an anode electrode in a furnace body of the direct current electric arc furnace, comparing the collected voltage values with a preset voltage value, calculating a difference value, and controlling the electrode lifting device to lift through the difference value to adjust the voltage value;
adjusting the temperature in the furnace: acquiring the temperature in the furnace, comparing the acquired temperature with a preset temperature, calculating a difference value and controlling the current of the direct current power supply through the difference value;
discharge temperature adjustment: the material temperature that the bin outlet flows is gathered to will gather the temperature and predetermine the temperature contrast, calculate the difference and control the feed volume through the difference.
2. A method for automatically controlling a dc electric arc furnace according to claim 1, wherein: the voltage regulation is characterized in that a voltage control sensor is arranged between a cathode electrode and an anode electrode of a furnace body of the direct current electric arc furnace, a voltage measurement module of the voltage control sensor collects a voltage value between the cathode electrode and the anode electrode in real time, a voltage DCS compares the collected voltage value between the electrodes with a preset voltage value of the voltage DCS, then a voltage operation module calculates a difference value between the collected voltage value between the electrodes and the preset voltage value, a lifting control signal trigger module generates a control signal of an electrode lifting device through the voltage difference value obtained by the voltage operation module and sends the control signal to an electrode lifting device, the electrode lifting device receives the control signal and then carries out lifting adjustment on the height of the cathode electrode through an internal actuator to cause the change of the arc length between the cathode electrode and the anode electrode, so as to adjust the actually measured voltage between the cathode electrode and the anode electrode, so that it eventually approaches the voltage preset value.
3. A method for automatically controlling a dc electric arc furnace according to claim 1, wherein: the temperature regulation in the furnace is characterized in that an in-furnace infrared temperature measuring device is arranged at the upper end of a furnace body of the direct current arc furnace and is used for collecting the temperature of a molten pool in the furnace in real time, the temperature of the molten pool in the furnace is compared with the temperature of the molten pool preset by the temperature DCS in the furnace, a temperature operation module in the furnace calculates the difference value between the collected temperature of the molten pool in the furnace and the temperature of the molten pool preset by the temperature DCS in the furnace, a power supply current control signal trigger module generates a voltage control signal of a direct current power supply according to the difference value calculated by the temperature operation module in the furnace and sends the voltage control signal to the direct current power supply, and after receiving the voltage control signal, a direct current power.
4. A method for automatically controlling a dc electric arc furnace according to claim 1, wherein: the discharging temperature regulation is characterized in that a feeding control device is arranged at a feeding port of a furnace body of the direct current electric arc furnace, a discharging infrared temperature measuring device is arranged at a discharging port on the side surface of the furnace body of the direct current electric arc furnace and collects the temperature of a material flowing out of the discharging port in real time, a discharging temperature DCS compares the temperature of the material flowing out of the discharging port collected by the discharging infrared temperature measuring device with the preset temperature of the material preset by the discharging DCS, a discharging temperature operation module calculates the difference value between the temperature of the material flowing out of the discharging port collected by the discharging temperature operation module and the preset temperature of the material preset by the discharging DCS, a feeding control signal trigger module generates a feeding control signal of the feeding control device according to the difference value calculated by the discharging temperature operation module and sends the feeding control signal to the feeding control device, and the feeding control, the effect of controlling the discharged materials is achieved.
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| CN113959686A (en) * | 2021-09-03 | 2022-01-21 | 中国重型机械研究院股份公司 | Detection device and calibration method for electrode lifting system of LF (ladle furnace) |
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| DE4240891C2 (en) * | 1992-12-04 | 1995-11-16 | Voest Alpine Ind Anlagen | DC arc furnace and method for operating it |
| CN1316071C (en) * | 2004-12-21 | 2007-05-16 | 大连理工大学 | Method for preparing magnesia crystal by using temperature control arc furnace |
| CN101782321B (en) * | 2010-01-27 | 2012-09-05 | 上海金自天正信息技术有限公司 | Automatic regulating device of DC electric arc furnace electrode and control method thereof |
| CN104674033B (en) * | 2015-03-20 | 2017-03-08 | 大连理工大学 | A kind of direct current electric arc furnace nickel-iron smelting fairing and its control method |
| CN206421213U (en) * | 2016-11-21 | 2017-08-18 | 西安奥邦科技有限责任公司 | A kind of induction heater intelligence control system |
| CN208767991U (en) * | 2018-12-26 | 2019-04-19 | 陕西盛联冶金科技有限公司 | The independently-powered power regulating system of the multipair electrode of direct current electric arc furnace |
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