An electrode lifting control system for an electric arc furnace

Abstract

The utility model discloses an electrode lifting control system of ore heating furnace belongs to ore heating furnace control technical field, has solved ore heating furnace control and is influenced by complex working condition bigger, and the problem of electrode regulation is not in time, and control precision is low. The utility model discloses including furnace condition data acquisition module and PAC controller, and furnace condition acquisition module is connected with PAC controller, and PAC controller is connected with hydraulic actuating module, and PAC controller still is connected with host computer. The utility model stable operation, safe and reliable, combines temperature field analysis and transformer electric parameter, and real -time acquisition furnace condition and electrode position, realizes electrode position and temperature control's synergic optimization, realizes ore heating furnace's electrode control's timely, and the precision, has very strong popularization.

Description

Technical Field

[0001] This utility model belongs to the field of electric arc furnace control technology, specifically relating to an electrode lifting and lowering control system for an electric arc furnace. Background Technology

[0002] Submerged arc furnaces are important pieces of equipment used for smelting ferroalloys, calcium carbide, and other products. They are mainly used to reduce and smelt ores, carbonaceous reducing agents, and solvents. They primarily produce ferroalloys such as ferrosilicon, ferromanganese, ferrochrome, ferrotungsten, and ferrosilicon-manganese alloys, which are important industrial raw materials in the metallurgical industry and chemical raw materials such as calcium carbide.

[0003] In the operation of submerged arc furnaces, electrode raising and lowering control is crucial for the stability of furnace conditions and production efficiency. During operation, the electrode position directly affects key indicators such as heat distribution, arc stability, and energy consumption. Currently, common electrode control methods for submerged arc furnaces rely on electrical parameters such as current and voltage, adjusting the electrode raising and lowering to maintain normal furnace operation. During smelting, the electrodes are continuously consumed, requiring periodic pressing and releasing to meet the required length of the working end. However, these electrical parameters are often affected by complex furnace conditions, such as changes in the furnace charge and arc fluctuations, leading to inaccurate measurements that fail to accurately reflect the actual temperature distribution within the furnace. This results in untimely electrode adjustment, affecting furnace stability and product quality. Utility Model Content

[0004] This invention provides an electrode lifting control system for a submerged arc furnace to solve the problems of existing submerged arc furnace control being greatly affected by complex operating conditions, untimely electrode adjustment, and low control accuracy.

[0005] The technical solution of this utility model is: an electrode lifting control system for a submerged arc furnace, including a furnace condition data acquisition module and a PAC controller. The furnace condition acquisition module is connected to the PAC controller, the PAC controller is connected to a hydraulic actuation module, and the PAC controller is also connected to a host computer.

[0006] As a further improvement of this utility model, the furnace condition data acquisition module includes multiple infrared thermal imagers and current transformers. The multiple infrared thermal imagers are respectively installed on the observation holes on the top of the electric arc furnace, and the multiple current transformers are installed on the incoming terminals of the electric arc furnace transformer. The infrared thermal imagers and current transformers collect data in real time and transmit it to the PAC controller.

[0007] As a further improvement of this utility model, the host computer includes an audible and visual alarm module and a recording and storage module. When the real-time operating data of the electric arc furnace triggers the control strategy, the audible and visual alarm module will promptly sound an alarm and record it in the recording and storage module.

[0008] The beneficial effects of this invention are as follows: By connecting the furnace condition data acquisition module, PAC controller, and hydraulic execution module, the hydraulic execution module enables electrode lifting and lowering, while the furnace condition data acquisition module monitors in real time, achieving closed-loop control and ensuring precise control of the submerged arc furnace electrodes. This invention also uses an infrared thermal imager to collect the surface temperature of the molten pool in real time, constructing a furnace surface temperature field model, locating hot spots, and predicting temperature change trends. This makes the electrode adjustment strategy more closely match the actual furnace conditions. Simultaneously, current and voltage detection provide auxiliary control. Compared to traditional single-point detection methods that rely on temperature and electrical parameters, the control reference is clearer and more accurate, achieving precise control of the submerged arc furnace electrodes. This invention operates stably and reliably. By combining temperature field analysis with transformer electrical parameters, it collects furnace operating conditions and electrode positions in real time, achieving synergistic optimization of electrode position and temperature control. This results in timely and precise electrode control of the submerged arc furnace and has strong applicability. Attached Figure Description

[0009] Figure 1 This is a control system diagram of the present invention;

[0010] Figure 2 This is a schematic diagram of the installation of the infrared thermal imager of this utility model.

[0011] In the diagram: 1. Furnace condition data acquisition module; 2. PAC controller; 3. Host computer; 4. Hydraulic actuator module; 5. Infrared thermal imager; 6. Current transformer. Detailed Implementation

[0012] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0013] Example 1

[0014] like Figure 1-2 As shown, an electrode lifting control system for a submerged arc furnace includes a furnace condition data acquisition module 1 and a PAC controller 2. The furnace condition acquisition module 1 is connected to the PAC controller 2, the PAC controller 2 is connected to a hydraulic actuation module 4, and the PAC controller 2 is also connected to a host computer 3.

[0015] The furnace condition data acquisition module 1 includes multiple infrared thermal imagers 5 and current transformers 6. The multiple infrared thermal imagers 5 are respectively installed on the observation holes on the top of the electric arc furnace, and the multiple current transformers 6 are installed on the output terminals of the electric arc furnace transformer. The infrared thermal imagers 5 and current transformers 6 collect data in real time and transmit it to the PAC controller 2.

[0016] The host computer 3 includes an audible and visual alarm module and a recording and storage module.

[0017] In operation, the infrared thermal imager 5 is connected to the PAC controller 2 via a double-shielded twisted-pair cable. The infrared thermal imager 5 performs thermal imaging analysis on the surface of the molten pool inside the furnace, forming a temperature field distribution and generating accurate temperature data, which is transmitted to the PAC controller 2 in real time in digital form. Simultaneously, key electrical parameters are collected through the current transformer 6. On the primary side, the high-voltage incoming line voltage (accuracy ±0.2%), current (equipped with Rogowski coil / Hall sensor), power, and frequency are monitored to reflect the stability of the power grid input. On the secondary side, low-voltage high-current, phase voltage, power factor, etc., are collected to directly reflect the load characteristics inside the furnace. At the same time, the furnace condition acquisition module also synchronously collects auxiliary parameters such as transformer oil temperature (Pt100, ±0.5℃) and winding temperature (thermocouple), comprehensively covering the equipment operating status.

[0018] PAC controller 2 receives signals transmitted from furnace condition data acquisition module 1, performs median filtering to remove noise, outliers, and missing values ​​from the data, and converts it into real data stored in the storage area of ​​PAC controller 2. Host computer 3 connects to PAC controller 2 via Ethernet communication link, reads data in real time, and presents the real data on site to obtain fused data that comprehensively reflects the furnace working conditions. At the same time, through the fault diagnosis logic of PAC controller 2, host computer 3 transmits signals to the audible and visual alarm module for abnormal working conditions such as over-temperature (furnace surface temperature > set threshold), abnormal current fluctuation (>10% of rated value), and electrode jamming, triggering a precise "voice" alarm and automatically recording the alarm time, type, and real-time data in the recording and storage module for easy historical alarm query and export.

[0019] Based on the matching results of the preset control rule library, a precise control command sequence is generated, specifically covering the precise setting of key parameters such as electrode lifting and lowering amplitude data, movement direction, and action timing. This ensures that the control program is highly consistent with the actual working conditions. With the help of the high-speed digital output channel of PAC controller 2, the digital commands generated by the control decision are converted into standard analog control signals. After enhancing the anti-interference capability through opto-isolation and signal conditioning circuits, the signals are transmitted to the actuator cylinder mechanism 4 to drive the actuator cylinder mechanism 4 to work and control the lifting and lowering of the cylinder, thereby realizing the lifting and lowering control of the electrode. When the actuator cylinder mechanism 4 is running, the furnace condition data acquisition module 1 synchronously acquires electrode data, monitors the actual position of the electrode, and transmits the information data back to the PAC controller system to realize closed-loop control.

[0020] Meanwhile, based on practical experience and combined with real-time operating data (current surges, temperature signals, etc.), a preset control strategy is set in the PAC controller 2. When abnormal data is generated, the PAC controller 2 sends information to the host computer 3. The host computer 3 promptly issues warnings and handles typical faults (such as slag overturning and short circuits) to help maintain the safety of the submerged arc furnace.

Claims

1. An electrode lifting control system for a submerged arc furnace, comprising a hydraulic actuation module (4), characterized in that: It includes a furnace condition data acquisition module (1), a PAC controller (2) and a host computer (3). The furnace condition acquisition module (1) is connected to the PAC controller (2), the PAC controller (2) is connected to a hydraulic actuation module (4), and the PAC controller (2) is also connected to the host computer (3).

2. The electrode lifting control system for a submerged arc furnace according to claim 1, characterized in that: The furnace condition data acquisition module (1) includes multiple infrared thermal imagers (5) and current transformers (6). The multiple infrared thermal imagers (5) are respectively installed on the observation hole on the top of the electric arc furnace, and the multiple current transformers (6) are installed on the output terminals of the electric arc furnace transformer.

3. The electrode lifting control system for a submerged arc furnace according to claim 1 or 2, characterized in that: The host computer (3) includes an audible and visual alarm module and a recording and storage module.

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