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Inner Mongolia Jushi Energy Six-Compressor Variable-Frequency Soft-Starting Project with Two Drives Serving Six Motors

Petrochemicals | Coking Upgrade / Synthetic Wax and Clean Chemicals / Compressor Group | Variable-Frequency Soft Starting for Six Large Compressors with Two Drives Serving Six Motors

Project Background

The coking upgrade project, with an annual synthetic wax production capacity of 200,000 tonnes and associated clean chemicals production, uses multiple large compressor motors. These include 24 MW feed-air compressor motors, 13 MW and 11 MW gas compressor motors, and 14 MW synthesis gas recycle compressor motors, with six motors to be started in total.

Project Challenges

  • The six compressor motors have different power ratings, so the system must support sequential starting of multiple motors.
  • The largest motor is rated at 24 MW, placing high demands on soft-starting capacity, phase-locked synchronization and transfer to the grid supply.
  • The project requires improved utilization of the soft-starting equipment, avoiding a separate starter for every motor.

Dayu Solution

Multiple GBRQ series high-voltage variable frequency soft starters form a system with two drives serving multiple motors. Each starter can provide soft-starting control for multiple motors. Phase-locked synchronization enables transfer to the line-frequency bypass near rated speed. After completing a start, the starter returns to standby, ready to serve the next motor.

Key Configuration

  • Motors to be started: Multiple units; maximum individual motor rating of 24 MW.
  • Compressor types: Feed-air compressors, gas compressors and synthesis gas recycle compressors.
  • Configuration: GBRQ series high-voltage variable frequency soft starters.
  • System: Two drives serving multiple motors, phase-locked synchronization, line-frequency bypass and sequential starting.

Application Value

The solution provides successive, sequential soft starting and transfer to line-frequency operation for multiple compressor motors. It demonstrates the engineering value of sharing soft-starting equipment across multiple motors while supporting successive starts and synchronous transfer.