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Aosen Steel 1,280 m³ Blast Furnace Blower Variable-Frequency Soft-Starting Project

Metallurgy & Steel | 1,280 m³ Blast Furnace / AV71 Blower | One Soft Starter per Motor with Bypass / Transfer from Variable-Frequency Starting to Line-Frequency Operation

Project Background

Aosen Steel's 1,280 m³ blast furnace is equipped with an AV71 compressor/blower. The blast furnace blower is critical drive equipment for ironmaking, and the project requires reliable soft-starting control for its motor.

Project Challenges

  • The blast furnace blower requires high starting reliability, as a failure could disrupt continuous blast furnace production.
  • Starting the large motor requires limiting the impact on the power grid and mechanical equipment.
  • After soft starting, the motor must transfer to line-frequency operation, with a clearly defined bypass path.

Dayu Solution

A GBRQ series high-voltage variable frequency soft starter is configured with one starter per motor and a bypass. The system provides variable-frequency soft starting for the blower motor, followed by transfer to line-frequency operation.

Key Configuration

  • Application: AV71 blower for a 1,280 m³ blast furnace.
  • Configuration: GBRQ series high-voltage variable frequency soft starter.
  • System: One soft starter per motor, with line-frequency bypass.

Application Value

The project applies soft starting and transfer to line-frequency operation to a critical blast furnace blower.