Method for removing electrical peripheral fault of blast furnace equipment

Abstract

The invention relates to a method for removing an electrical peripheral fault of blast furnace equipment, and belongs to the technical field of metallurgical production auxiliary methods. According to the technical scheme, a circuit breaker corresponding to field equipment is installed; installing a shielding circuit breaker corresponding to the field equipment signal in the power distribution cabinet; when a fault occurs, a circuit breaker of the fault equipment trips, and a fault signal is physically removed; and after the fault occurs, the shielding circuit breaker corresponding to the fault equipment in the power distribution cabinet is switched on, and the signal loop of the power distribution cabinet is quickly recovered to normal. The method has the beneficial effects that by adopting the field equipment circuit breaker and the shielding circuit breaker in the power distribution cabinet, physical disconnection between a fault signal and a power distribution room equipment power supply loop can be realized when a fault occurs, so that a signal loop of the power distribution cabinet quickly returns to normal, normal operation of all blast furnace system equipment is ensured, and major damping down accidents of a blast furnace are avoided.

Description

Technical Field

[0001] The invention relates to a method for eliminating electrical peripheral faults of blast furnace equipment, belonging to the technical field of metallurgical production auxiliary methods. Background Art

[0002] Stable blast furnace production is the most important link of metallurgical enterprises. At the same time, smooth and high-yield blast furnace production is an important and irreplaceable major measure for metallurgical enterprises to have good economic indicators, reduce costs and increase efficiency. Whether all these measures can achieve the expected results, stable operation of equipment is the basic guarantee. Blast furnace production is the result of multiple production process operations, stable operation of multiple equipment, and coordinated supply of multiple raw materials and fuels in a certain order. After the rapid development of metallurgical enterprises in recent decades, the production process and raw material supply have basically determined a stable mode and have basically not changed. In this way, the smooth and high-yield blast furnace is constrained by the stable operation of equipment.

[0003] Blast furnace equipment has its own unique industry characteristics, and long-term stable operation is difficult to control.

[0004] Feature 1: There are many types and quantities of blast furnace equipment, and the control lines are complex. The production process of each blast furnace includes 7 major processes and dozens of production lines, including batching, material transportation, coal injection, hot air, smelting, dust removal, and purification, which require uninterrupted operation of the assembly line. These production lines must be carried out in an orderly manner around the blast furnace production. The models of hundreds of production equipment in the 7 major processes almost include all types of metallurgical enterprises. These equipment are distributed in every corner of each production line. The production lines must be operated in a highly orderly manner, and the upper and lower processes of the production line must be operated in a highly orderly manner. These require the interlocking control of various signals. The distance from batching to the top of the blast furnace is thousands of meters, and other process unit equipment is hundreds of meters. Various signals, communications, and control cables fill the cable trays (grooves and grooves) in their respective distribution rooms. Fault finding is time-consuming and laborious, and cannot meet the requirements of uninterrupted operation of each production line of the blast furnace. The probability of system outage is inevitable.

[0005] Feature 2: The environment in which blast furnace equipment is located is complex, and there are many uncontrollable factors for the long-term stable operation of the equipment. Ironmaking requires various raw materials such as sintered ore, pelletized ore, coke, and pulverized coal. The transportation of these raw materials all relies on belt conveyors. The various dusts caused by this operation process will inevitably corrode the body and junction box (column) of electrical components, and cause short circuits, grounding and other faults in electrical signals. Ironmaking requires high-pressure wind (water), steam, coal gas, compressed air and other media. These power media are harmful to electrical equipment everywhere. The power pipeline network requires various electric valves, various flow rates, and liquid level controls. Where there is power medium, there are electrical control components. In this way, electrical components are most difficult to avoid being damaged by water and steam, resulting in poor contact of electrical components and reduced insulation strength.

[0006] Feature 3: The blast furnace smelting process produces high-temperature molten iron and iron slag above 1380 degrees Celsius, which is fatal and irreparable to electrical equipment. The design and use conditions of electrical equipment are basically at room temperature and pressure, and high temperature resistance is generally within 100 degrees Celsius above normal temperature conditions. When molten iron at thousands of degrees Celsius is sprayed onto the body of the electrical equipment, the electrical components and materials are instantly scrapped, and the production line equipment immediately stops running.

[0007] In summary, the objective requirement for high output and high efficiency of each blast furnace in ironmaking is that all equipment in the production line must operate stably. If a large number of production line equipment has electrical faults such as short circuit, grounding, loose contact, reduced insulation strength, etc., it will cause the entire blast furnace to stop working. At the same time, the industry characteristics of ironmaking equipment cannot guarantee the stable operation of the equipment. Summary of the invention

[0008] The purpose of the present invention is to provide a method for eliminating electrical peripheral faults of blast furnace equipment. By adopting on-site equipment circuit breakers and shielded circuit breakers in distribution cabinets, it is possible to physically disconnect the fault signal from the power supply circuit of the distribution room equipment when a fault occurs, so that the signal circuit of the distribution cabinet can quickly return to normal, ensuring the normal operation of all blast furnace system equipment, avoiding major blast furnace shutdown accidents, and effectively solving the above-mentioned problems existing in the background technology.

[0009] The technical solution of the present invention is: a method for eliminating electrical peripheral faults of blast furnace equipment, comprising the following steps: (1) Install the circuit breakers corresponding to the on-site equipment; (2) Install shielded circuit breakers corresponding to the field equipment signals in the power distribution cabinet; (3) When a fault occurs, the circuit breaker corresponding to the on-site equipment trips, physically cutting off the fault signal; (4) After a fault occurs, close the shielding circuit breaker corresponding to the faulty equipment in the distribution cabinet to quickly restore the signal circuit of the distribution cabinet to normal.

[0010] The field equipment includes instruments, operating circuits, pull ropes, deviation, tearing and cleaning protection circuits, alarms and braking equipment.

[0011] The step (1) comprises the following steps: (11) Determine the wiring of field equipment control circuits; (12) Determine the power distribution cabinet that supplies power to the equipment and uses the power line to the site; (13) Determine the line connection method of on-site equipment; (14) Clarify the control logic of the field lines, power supply equipment and signal circuits in the distribution room; (15) Install the circuit breakers corresponding to the on-site equipment.

[0012] The step (2) includes the following steps: (21) Reconstruct the distribution cabinet circuit of the blast furnace power supply equipment, and directly access and connect the signals of the field equipment in the distribution cabinet according to the control principle and wiring method of the distribution cabinet itself; (22) Shielding circuit breakers corresponding to the field equipment signals are installed in the power distribution cabinet, and the field equipment signals are fed back to the power distribution cabinet through their respective shielding circuit breakers.

[0013] The beneficial effect of the present invention is that by adopting on-site equipment circuit breakers and shielded circuit breakers in the distribution cabinet, it is possible to physically disconnect the fault signal from the power supply circuit of the distribution room equipment when a fault occurs, so that the signal circuit of the distribution cabinet can quickly return to normal, ensuring the normal operation of all blast furnace system equipment and avoiding major blast furnace shutdown accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic block diagram of the electrical control of the entire equipment system of the blast furnace of the present invention; Figure 2 It is a schematic block diagram of electrical control of blast furnace feeding equipment in the background art; Figure 3 It is a schematic block diagram of the electrical control of the blast furnace feeding equipment of the present invention. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solutions and advantages of the invention implementation cases clearer, the technical solutions in the implementation cases of the present invention will be clearly and completely described below in conjunction with the drawings in the implementation cases. Obviously, the implementation cases described are only a small part of the implementation cases of the present invention, rather than all the implementation cases. Based on the implementation cases in the present invention, all other implementation cases obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0016] A method for eliminating electrical peripheral faults of blast furnace equipment comprises the following steps: (1) Install the circuit breakers corresponding to the on-site equipment; (2) Install shielded circuit breakers corresponding to the field equipment signals in the power distribution cabinet; (3) When a fault occurs, the circuit breaker corresponding to the on-site equipment trips, physically cutting off the fault signal; (4) After a fault occurs, close the shielding circuit breaker corresponding to the faulty equipment in the distribution cabinet to quickly restore the signal circuit of the distribution cabinet to normal.

[0017] The field equipment includes instruments, operating circuits, pull ropes, deviation, tearing and cleaning protection circuits, alarms and braking equipment.

[0018] The step (1) comprises the following steps: (11) Determine the wiring of field equipment control circuits; (12) Determine the power distribution cabinet that supplies power to the equipment and uses the power line to the site; (13) Determine the line connection method of on-site equipment; (14) Clarify the control logic of the field lines, power supply equipment and signal circuits in the distribution room; (15) Install the circuit breakers corresponding to the on-site equipment.

[0019] The step (2) includes the following steps: (21) Reconstruct the distribution cabinet circuit of the blast furnace power supply equipment, and directly access and connect the signals of the field equipment in the distribution cabinet according to the control principle and wiring method of the distribution cabinet itself; (22) Shielding circuit breakers corresponding to the field equipment signals are installed in the power distribution cabinet, and the field equipment signals are fed back to the power distribution cabinet through their respective shielding circuit breakers.

[0020] In practical application, the present invention comprises the following steps: Step A: Common faults such as short circuit, grounding, loose contact, reduced insulation strength, etc. may occur in the control lines of blast furnace on-site instruments, operating circuits, pull ropes, deviation, tearing, cleaning and other protection circuits, alarms, brakes and other equipment. In order to ensure blast furnace production, the above fault signals are physically removed.

[0021] Step B: Rapidly restore the operation of the blast furnace equipment system. Perform line reconstruction on the equipment power supply and signal circuit in the distribution room to ensure that the on-site fault line is physically removed. The electrician only needs to go to the distribution room to close the emergency switch, and the equipment power supply and signal circuit in the distribution room will be restored instantly to avoid major production accidents such as reduced wind or wind shutdown in the blast furnace system.

[0022] In step A, the wiring and principles of the control lines of the blast furnace field instruments, operating circuits, pull ropes, deviation, tearing, cleaning and other protection circuits, alarms, brakes and other equipment are verified on site, and the power distribution cabinets that power the equipment use to access the power lines on site are determined. The connection methods of the field instruments, operating circuits, pull ropes, deviation, tearing, cleaning and other protection circuits, alarms, brakes and other equipment lines are determined, and the control logic of the field lines and the power supply equipment and signal circuits in the distribution room is clarified. The names of the circuit breakers controlled by the distribution cabinets on site are marked. If short circuits, grounding, false contact, reduced insulation strength and other faults occur on site, the electrician pulls down the faulty circuit breaker to ensure that there is an obvious physical disconnection point between the fault signal and the power supply circuit of the distribution room equipment.

[0023] In step B, the distribution cabinet circuit of the blast furnace power supply equipment is transformed. According to the control principle and wiring method of the distribution cabinet itself, the signals fed back to the distribution cabinet from the blast furnace on-site instruments, operating circuits, pull ropes, deviation, tearing, cleaning and other protection circuits, alarms, brakes and other equipment are directly taken and connected in the distribution cabinet and completed through the shielding circuit breakers of their respective signals. Closing their respective shielding circuit breakers completes the rapid recovery of the distribution cabinet signal circuit to normal, ensuring the normal operation of all blast furnace system equipment and avoiding major accidents of blast furnace outages.

[0024] In the background technology, the circuit breakers of the control lines of the field instruments, operation circuits, pull ropes, deviation, tearing, cleaning and other protection circuits, alarms, brakes and other equipment of the blast furnace feeding equipment system share a large-capacity circuit breaker A. If a signal fails in multiple circuits on site, such as short circuit, grounding, false contact, reduced insulation strength and other faults, the probability of all the above faults occurring is zero. The "pull rope grounding" with the highest number of faults is further explained as an example. The "pull rope" of the field operating equipment is corroded by dust, steam, and high-temperature molten iron, and the grounding resistance is much smaller than the original contact resistance between the original insulated wire and the earth. The wire will generate a large grounding short-circuit current, which instantly causes the control field instruments, operation circuits, pull ropes, deviation, tearing, cleaning and other protection circuits, alarms, brakes and other equipment to trip. Since the field instruments, operation circuits, pull ropes, deviation, tearing, cleaning and other protection circuits, alarms, brakes and other equipment share a main circuit breaker A, all signal circuits of each device have no electrical signals, causing the equipment to stop running immediately. The electrician received a call and went to the equipment power supply substation to check the cause of the fault. It was necessary to check all the circuits on site one by one, which took more than 30 minutes. The blast furnace feeding, coal injection, hot air, and smelting systems are a tight and uninterrupted assembly line. The maximum time allowed for interruption in each process is within 15 minutes. After this time, the blast furnace can only be slow-blown. The result of this process operation is that the supply of raw fuel and power medium for the blast furnace does not change, the molten iron produced by the blast furnace is significantly reduced, and the economic and technical indicators of the blast furnace drop precipitously. If the time is longer than 60 minutes, the blast furnace can only be stopped, causing the blast furnace to stop production, and the economic and technical indicators of the blast furnace fall into a loss state.

[0025] The present invention arranges the control circuit breakers of the blast furnace on-site instruments, operating circuits, pull ropes, deviation, tearing, cleaning and other protection circuits, alarms, brakes and other equipment separately, such as Figure 3 In the field operation box circuit breaker B, field instrument circuit breaker C, field pull-rope circuit breaker D, field deviation circuit breaker E, field tear circuit breaker F........, at the same time, in order to operate faster and safer, the circuit breakers with their own control signals on site are added with their own shielding functions, such as Figure 3The circuit breaker B-1 in the middle operation box, the circuit breaker C-1 of the field instrument, the circuit breaker D-1 of the field pull rope, the circuit breaker E-1 of the field deviation, the circuit breaker F-1 of the field tearing........ The shielding function circuit breaker and the original circuit breaker jointly control their respective signal circuits. The only difference is that the original circuit breaker sends power to the respective circuits on site during normal operation. After the detection, display, protection and other functions of the field circuits are completed, they are fed back to the respective signal circuits to complete the start / stop of the equipment and the interlocking of the entire system equipment of the blast furnace. The circuit breaker with the shielding function directly controls the respective signal circuits. The control line does not pass through the site, but is only laid in the power distribution cabinet. The safety and reliability of controlling the respective signal circuits can reach 100%. In normal production of the blast furnace, the respective shielding circuit breakers in the cabinets are in the disconnected state and do not participate in equipment control.

[0026] Taking the "pull rope grounding" with the highest number of faults as an example, the handling process of pull rope grounding faults is further explained. The "pull rope" of the on-site operating equipment is corroded by dust, steam, and high-temperature molten iron, and a grounding accident occurs (such accidents are inevitable). The grounding resistance is much smaller than the original contact resistance between the original insulated wire and the earth. The wire will generate a large grounding short-circuit current, which instantly causes the control site pull rope circuit breaker D to trip. This is not the tripping of the main circuit breaker A. At this time, the control of the equipment operation box circuit breaker B, the on-site instrument circuit breaker C, the on-site deviation circuit breaker E, and the on-site tearing circuit breaker F are all powered normally. The pull rope grounding fault also occurs, and the power outage range is greatly reduced. The electrician can find the cause of the fault very intuitively at the substation, simply test and verify the cause of the pull rope circuit breaker D tripping, disconnect the power supply of the circuit breaker, and close the on-site pull rope circuit breaker D-1 that is not usually involved in the control, and immediately restore the pull rope signal loop signal. The pull rope grounding fault of the equipment will be eliminated within 15 minutes, ensuring the normal operation of the equipment within 15 minutes and the operation of the entire blast furnace equipment system. When the entire equipment system of the blast furnace is operating normally and the on-site pull rope control power supply has been disconnected, electricians can investigate the specific reasons for the grounding of the pull rope for a long time and thoroughly deal with different reasons.

Claims

1. A method for eliminating electrical peripheral faults of blast furnace equipment, characterized in that The following steps are involved: (1) Install the circuit breakers corresponding to the on-site equipment; (2) Install shielded circuit breakers corresponding to the field equipment signals in the power distribution cabinet; (3) When a fault occurs, the circuit breaker corresponding to the on-site equipment trips, physically cutting off the fault signal; (4) After a fault occurs, close the shielding circuit breaker corresponding to the faulty equipment in the distribution cabinet to quickly restore the signal circuit of the distribution cabinet to normal.

2. A method for eliminating electrical peripheral faults of blast furnace equipment according to claim 1, characterized in that: The field equipment includes instruments, operating circuits, pull ropes, deviation, tearing and cleaning protection circuits, alarms and braking equipment.

3. A method for eliminating electrical peripheral faults of blast furnace equipment according to claim 1, characterized in that: The step (1) comprises the following steps: (11) Determine the wiring of field equipment control circuits; (12) Determine the power distribution cabinet that supplies power to the equipment and uses the power line to the site; (13) Determine the line connection method of on-site equipment; (14) Clarify the control logic of the field lines, power supply equipment and signal circuits in the distribution room; (15) Install the circuit breakers corresponding to the on-site equipment.

4. A method for eliminating electrical peripheral faults of blast furnace equipment according to claim 1, characterized in that: The step (2) includes the following steps: (21) Reconstruct the distribution cabinet circuit of the blast furnace power supply equipment, and directly access and connect the signals of the field equipment in the distribution cabinet according to the control principle and wiring method of the distribution cabinet itself; (22) Shielding circuit breakers corresponding to the field equipment signals are installed in the power distribution cabinet, and the field equipment signals are fed back to the power distribution cabinet through their respective shielding circuit breakers.

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