Adjustable Speed Drives on Combustion Air Fans

For situations where furnace air demand show variations over time while cooling air and stack blowers run continuously, the the use of Adjustable Speed Drives (ASDs) for the fans may offer an opportunity to save electricity. For furnaces showing high variations in the heat demand (e.g. in small-scale, intermittently used furnaces) may also help reduce fuel consumption by reducing excess air amounts (Worrell et al., 2008. p.60). More information about the application of ASDs in motor driven systems is available here

Development Status Products

Adjustable Speed Drives on Combustion Air FansCosts & Benefits

Parent Process: Melting and Refining
Energy Savings Potential

US flag In a US based plant, a potential to reduce electricity consumption by 800 000 kWh/y with the use of ASDs has been identified (Worrell et al., 2008. p.60). 

CO2 Emission Reduction Potential

US flag

 In a US based plant, the payback time for installing ASDs was estimated to be 1.7 years. 

The savings and the payback time will depend on the operating conditions of the fan system and the size of the furnace (Worrell et al., 2008. p.60).

Adjustable Speed Drives on Combustion Air Fans Publications

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