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CS0018

Forging great savings in South Wales

A steel company in South Wales carried out the UK’s largest construction project for 2012, with the important rebuild of its blast furnace. Part of the project involved the design, manufacture, supply, installation and commissioning of the transformer, drives, motors and control systems for the combustion air fans, cooling tower fans and fume extraction fans.

Replacing the existing Direct-On-Line motor starters with state-of-the-art low harmonic variable speed drives, along with new transformers and motors, would provide both cost and energy savings.

 

Our Solution

The combustion air fans comprised three variable speed drives, with the speed determined by duty cycle and combustion air demand. They operate as two duty and one standby, or together at a reduced speed.

Existing fixed speed motor control systems for the water-cooling towers were upgraded with three new variable speed drives each rated at 90KW, to maintain the set delivery water temperature. The two fume extract fans driven by ‘Syncdrive’ variable speed drive systems were replaced with new motors inclusive of a new bed plate and half coupling.

Control and speed set point(s) for the above systems are derived from an ABB AC800 PLC over a profibus DP link. Drives were housed in an IP54 steel container designed specifically for this application to include internal ducting, removing in excess of 50kw of dissipated heat.

 

Results

  • Complete upgrade of old and obsolete equipment
  • Reduced costs
  • Increased energy savings

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