Drives halve bills

Over £30,000 per year is being saved at Glaxo-Wellcome in Ulverston by using ABB Industrial Systems’ a.c. drives, which are located on a steam boiler. Electricity consumed by a 200kW and a 150kW fan on the boiler has been halved since the ABB drives were supplied. The drives control the speed of the supply and […]

Over £30,000 per year is being saved at Glaxo-Wellcome in Ulverston by using ABB Industrial Systems’ a.c. drives, which are located on a steam boiler.

Electricity consumed by a 200kW and a 150kW fan on the boiler has been halved since the ABB drives were supplied. The drives control the speed of the supply and extract fans to suit the boiler load, enabling Glaxo-Wellcome to obtain cube-law savings (when flow is halved, power consumption reduces by eight).

Previously, the fan motors were running at full speed with flow control by dampers, but the 80 tonne/hour boiler ran at low loads for long periods. Tony Wallace, from Glaxo, therefore aimed to reduce the electricity consumption of the two fans with variable speed drives. `After one year of using the ABB drives, the savings gave us a payback of just 16 months’, said Wallace.

Additional benefits brought by the drives include improved process control and a dramatic reduction in noise. `With the new system we have noticed much faster response to boiler load changes and the noise level in the area has reduced from 89dBa to 77dBa’, said Wallace.

The improved motor efficiency produced by the drive has also eliminated the drain that the high starting current of the 200 kW motors originally put on the electrical system.

{{ABB Industrial Systems,Tel: 01438 742366; Fax: 742367.358 on enquiry card}}