CN-122012863-A - Monitoring equipment and method for preventing electrode breakage of LF refining furnace

Abstract

The invention relates to monitoring equipment and a method for preventing electrode breakage of an LF refining furnace, and belongs to the technical field of ferrous metallurgical devices and methods. The technical scheme of the invention is that an electrode inserting hole (1) is formed in a small refractory furnace cover (2), an electrode (4) penetrates through the small refractory furnace cover (2) through the electrode inserting hole (1), a transformer (5) is connected with the electrode (4), the input end of a control system (6) is connected with the transformer (5), the output end of the control system (6) is connected with a hydraulic system (7), and the hydraulic system (7) controls the electrode (4). The invention has the beneficial effects of avoiding electrode breakdown and breakage caused by untimely accumulated slag cleaning, avoiding production interruption or unqualified product quality, realizing accurate accumulated slag cleaning operation in the LF furnace production process, avoiding frequent accumulated slag cleaning operation of field operators and saving cleaning workload.

Inventors

• SU LAYU
• LI JUNYAN
• QI LIGUO
• WANG LI
• MAN YUANYUAN
• XU TIANQI
• ZHOU QUANLIN
• Zhou Zhuosuo
• XU YANYANG

Assignees

• 河钢乐亭钢铁有限公司
• 唐山钢铁集团有限责任公司
• 河钢股份有限公司唐山分公司

Dates

Publication Date

20260512

Application Date

20260319

Claims (6)

1. 1. The monitoring equipment for preventing the electrode breakage of the LF refining furnace is characterized by comprising an electrode inserting hole (1), a small refractory furnace cover (2), an electrode (4), a transformer (5), a control system (6) and a hydraulic system (7), wherein the electrode inserting hole (1) is arranged on the small refractory furnace cover (2), the electrode (4) penetrates through the small refractory furnace cover (2) through the electrode inserting hole (1), the transformer (5) is connected with the electrode (4), the input end of the control system (6) is connected with the transformer (5), the output end of the control system (6) is connected with the hydraulic system (7), and the hydraulic system (7) controls the electrode (4).
2. 2. The monitoring device for preventing electrode breakage of an LF refining furnace according to claim 1, wherein the electrode (4) is a three-phase electrode, and the diameter of the electrode insertion hole (1) is matched with the diameter of the three phases of the electrode (4).
3. 3. The monitoring device for preventing electrode breakage of LF refining furnace according to claim 1, wherein the hydraulic system (7) comprises a hydraulic pump, a hydraulic valve group, a hydraulic cylinder and a pipeline, the hydraulic pump is connected with the hydraulic cylinder through the hydraulic valve group and the pipeline, and the electrode (4) is fixed and lifted through the hydraulic cylinder.
4. 4. The monitoring method for preventing the electrode breakage of the LF refining furnace is characterized by comprising the following steps of: (1) After the LF furnace is heated and started, the electrode descends simultaneously, and a control system operation program monitors the three-phase voltage of the transformer; (2) When a certain phase of the electrode is discharged due to slag accumulation on the electrode and the furnace cover, the voltage is reduced to be below U2 and lasts for T1 seconds, the alarm is immediately given out, wherein U2 is the maximum voltage of the electrode to the ground under the abnormal condition that the slag accumulation contacts with the three-phase electrode; (3) The control system sends a signal to the hydraulic system, the hydraulic system lifts the three-phase electrode, and the heating process is stopped; (4) The operators at the post organize and clean accumulated slag.
5. 5. The method for preventing electrode breakage of LF refining furnace as claimed in claim 1, wherein in the step (1), three-phase electrodes are lowered through the small furnace cover of refractory through the electrode insertion holes.
6. 6. The method for preventing electrode breakage of LF refining furnace in claim 1, wherein in the step (2), Wherein U is heating set voltage, R is minimum resistance of accumulated slag to the ground, T1 has a value range of T2< T1< (T-T2), T is time from the position of the refractory small furnace cover to the contact of the molten steel, and T2 is time difference between the first contact of the molten steel and the last contact of the molten steel in three phases of the electrode.

Description

Monitoring equipment and method for preventing electrode breakage of LF refining furnace Technical Field The invention relates to monitoring equipment and a method for preventing electrode breakage of an LF refining furnace, and belongs to the technical field of ferrous metallurgical devices and methods. Background With the great improvement of continuous casting ratio in China, the steel types processed by the LF furnace almost relate to all steel types from special steel to plain carbon steel. LF stove equipment is comparatively simple, and the investment is little. The production process can meet the requirement of quality control and is formulated by adopting a plurality of different process operations. Different matched combinations can be carried out according to the product needs in the production, and the requirements of quality control of the final product are met. In the process, the three-phase electrode system of the LF furnace descends at the beginning of the production process, slag is accumulated at the insertion position of the electrode of the small furnace cover, so that the electrode is discharged through slag accumulation of the small furnace cover, the electrode breaks down and falls into molten steel, and finally, production interruption and exceeding of carbon content of molten steel are caused to return to the furnace. Disclosure of Invention The invention aims to provide monitoring equipment and method for preventing electrode breakage of an LF refining furnace, which are used for controlling lifting of the electrode and cleaning of accumulated slag by monitoring three-phase voltage of a transformer, avoiding production interruption or unqualified product quality caused by electrode breakdown breakage due to untimely accumulated slag cleaning, realizing accurate accumulated slag cleaning operation in the LF furnace production process, avoiding frequent accumulated slag cleaning operation of field operators, saving cleaning workload and effectively solving the problems in the background technology. The technical scheme is that the monitoring equipment for preventing the electrode of the LF refining furnace from being broken comprises an electrode insertion hole, a small refractory furnace cover, an electrode, a transformer, a control system and a hydraulic system, wherein the electrode insertion hole is formed in the small refractory furnace cover, the electrode penetrates through the small refractory furnace cover through the electrode insertion hole, the transformer is connected with the electrode, the input end of the control system is connected with the transformer, the output end of the control system is connected with the hydraulic system, and the hydraulic system controls the electrode. The electrode is a three-phase electrode, and the diameter of the electrode insertion hole is matched with the diameter of the three phases of the electrode. The hydraulic system comprises a hydraulic pump, a hydraulic valve group, a hydraulic cylinder and a pipeline, wherein the hydraulic pump is connected with the hydraulic cylinder through the hydraulic valve group and the pipeline, and the electrode is fixed and lifted through the hydraulic cylinder. A monitoring method for preventing electrode breakage of an LF refining furnace, comprising the following steps: (1) After the LF furnace is heated and started, the electrode descends simultaneously, and a control system operation program monitors the three-phase voltage of the transformer; (2) When a certain phase of the electrode is discharged due to slag accumulation on the electrode and the furnace cover, the voltage is reduced to be below U2 and lasts for T1 seconds, the alarm is immediately given out, wherein U2 is the maximum voltage of the electrode to the ground under the abnormal condition that the slag accumulation contacts with the three-phase electrode; (3) The control system sends a signal to the hydraulic system, the hydraulic system lifts the three-phase electrode, and the heating process is stopped; (4) The operators at the post organize and clean accumulated slag. In the step (1), the three-phase electrode passes through the small furnace cover of the refractory material through the electrode insertion hole to conduct descending operation. In the step (2), the step of (c),Wherein U is heating set voltage, R is minimum resistance of accumulated slag to the ground, T1 has a value range of T2< T1< (T-T2), T is time from the position of the refractory small furnace cover to the contact of the molten steel, and T2 is time difference between the first contact of the molten steel and the last contact of the molten steel in three phases of the electrode. The invention has the beneficial effects that the lifting of the electrode and the cleaning of accumulated slag are controlled by monitoring the three-phase voltage of the transformer, so that the electrode breakdown and breakage caused by untimely cleaning of the accumulated slag are