INVT GD350-19 VFD for Blast Furnace Top Main Hoisting System Retrofit in Steel Industry

With the rise of emerging industries and the upgrading of traditional industries, the market demand for higher quality, performance, and diversification of steel products is constantly increasing. In the blast furnace iron-making process of steel plants, the main hoisting system at the blast furnace top is a key piece of equipment for lifting and conveying furnace charges (such as ore, coke, and flux). It is responsible for accurately transporting raw materials to the top of the blast furnace and completing the charging process, ensuring uniform charge distribution for efficient smelting.

As a core link in blast furnace charging, the reliability and operating efficiency of the main hoisting system directly affect the blast furnace smelting effect, energy consumption, and production continuity. System failures can cause fluctuations in furnace conditions or even shutdowns, resulting in significant losses for the enterprise. Therefore, its design, manufacturing, and maintenance must strictly adhere to industry standards.

01 Customer Requirements

A key private steel enterprise in Liaoyang, Liaoning Province, whose core business is the production of rebar and special steel, has continuously expanded its scale through technological upgrades and capacity expansion.

Currently, the main hoist of the group's 1200m³ blast furnace top is driven by dual 500kW motors. Due to the long service life of the equipment, the supply of spare parts is facing difficulties, and the company has decided to replace it with domestically produced parts.

The specific requirements are as follows:

1. System compatibility: It must be compatible with the existing PLC system without modifying the control wiring and program.
2. Load balancing and control mode: It must have a load balancing function and adopt a master-slave mode to stably control the hoist's lifting and lowering operations.
3. SVC(Sensor-less vector control): The SVC of the VFD must meet the requirement of outputting high torque even under low-frequency operation.
4. Brake logic function: It must be equipped with a complete brake logic to ensure that there is no slippage during equipment start-up and shutdown.

02 INVT solution

Taking into account factors such as product performance, on-site solutions, on-site service, and price, the customer ultimately chose to replace their existing products with GD350-19 series VFD.

GD350-19 employs advanced vector control technology, enabling precise control of motor speed and torque, making it particularly suitable for equipment like the blast furnace top main hoist, which demands extremely high operational accuracy and stability. Furthermore, G350-19 series VFD boasts environmental adaptability and reliability, enabling stable operation in harsh industrial environments such as high-temperature and high-dust conditions.

03 Customer benefit

1. Vector control with PID parameters can be set and switched, ensuring no abnormal noise from the low-frequency, low-response motor and improving the stability and reliability of the blast furnace top.

2. Rich brake logic functions support closing and opening frequency and torque verification, ensuring the winch does not slip and enhancing equipment operation safety.

3. SVC control exhibits excellent low-frequency, high-torque characteristics, stable master-slave control, and load balance, ensuring efficient operation of the winch system.

4. Compared to the original brand, the transmission cabinet size is reduced, making floor-mounted installation more convenient and saving over 30% in equipment maintenance costs.

With the continuous maturation of domestic VFD technology and the increasingly sound service system, domestic substitution has become an inevitable trend for the development of steel enterprises. :contentReference[oaicite:0]{index=0}, leveraging its technological advantages and rich experience, is steadily advancing on the path of localization. Currently, INVT has achieved a series of breakthroughs in key projects of major customers such as Baowu and Anshan Iron & Steel.

In the future, INVT will continue to strive for progress, committed to promoting the widespread replication and application of its product solutions in the metallurgical industry, building a new model for digital business development, and injecting new momentum into the metallurgical industry.