The Challenge
Frequency inverters are core equipment for efficient energy conservation and precision control in metallurgical systems. By precisely adjusting motor speed, they are applied throughout the entire production process: in the raw material phase, they control conveying and crushing equipment to achieve stable output and energy savings; in the steelmaking phase, they drive converters, oxygen lances, and continuous casting machines to ensure process precision and safety; in the steel rolling phase, they meet the high dynamic response and synchronization requirements of rolling mills and coilers to improve steel quality; and in the renovation of auxiliary systems, they can reduce energy consumption by 20%-50% for "high energy-consuming equipment" such as blast furnace fans.
For selection, frequency inverters must be adapted to the heavy-load and harsh environments of metallurgy—products with strong overload capacity and high protection levels should be chosen, while also considering power grid, braking, and communication requirements. With advantages such as high control precision and extended equipment service life, frequency inverters have become key to enhancing the competitiveness of metallurgical systems.
The Solution
With "Precise Speed Control, Energy Conservation & Efficiency Enhancement, and Stable Production" as its core objectives, this solution adopts frequency inverters as the core control equipment for metallurgical systems. It achieves precise motor speed adjustment through vector control, covering the entire production process:
Raw Material Phase: Drives conveying and crushing equipment to dynamically adapt to raw material proportions, saving 15%-30% more energy compared to traditional throttling methods.
Steelmaking Phase: For converters, oxygen lances, and continuous casting machines, it achieves a tilting accuracy of ±0.5° and a lifting speed of 0.1 m/s with high torque and fast response, ensuring molten steel efficiency and slab quality.
Steel Rolling Phase: Uses frequency inverters with 150% overload capacity to meet the frequent start-stop demands of heavy-load equipment. The multi-motor synchronization accuracy reaches ±0.1%, and the strip thickness deviation is ≤0.02 mm.
Auxiliary System Renovation: Transforms kilowatt-level fans and pumps, and combines PID control to achieve 20%-50% energy savings.
Adapted to the metallurgical environment (45℃ high temperature, dusty, and corrosive conditions), the solution selects frequency inverters with IP54 protection rating and high-temperature heat dissipation functions. It is equipped with filters (total harmonic distortion ≤5%) and braking units, and supports industrial communication docking with DCS/PLC systems.
Ultimately, the solution helps enterprises reduce energy consumption, increase product qualification rates by 2%-3%, extend equipment service life by 3-5 years, and promote the intelligent and green transformation of the metallurgical industry.