Understanding Blowers: How to Make the Best Use of Blowers and Compressors

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TURCK GmbH

EDL Anlagenbau Gesellschaft mbH

Everest Blower Systems

Use of Rotary Air Blowers

Rotary air blowers are widely used in process applications demanding medium pressures and relatively large flow rates. Such as –

• Water treatment plants: For backwashing of filter beds

• Effluent treatment plants: For diffused aeration and agitation of effluent

• Cement plants: For blending, aeration, fluidisation and conveying

• Slurry agitation: For maintaining the B.O.D. / C.O.D

• Aquaculture: For maintaining the dissolved oxygen level

• Biogas boosting: Transferring of biogas from gasholder to boiler

• Flocculation: To increase the removal of suspended solids in primary setting facility

• Chemical plants: For supplying of process air

• Electroplating plants: For oil free air agitation of electrolyte to maintain uniform density

• Paper plants: For coating of paper or knife edge

• Yarn drying: Vacuum or pressure drying of yarn

• Polyester chip conveying and drying: For transfer of polyester chips

• Reverse jet filters: For reverse cleaning of filter bags

• Pneumatic conveying: Vacuum, pressure and combination conveying of cereals, cement, husk, baggage, granules, powders and other similar material the best performance

It is important to ensure that the system back pressures across the blower i.e., the sum of all the pressures such as drop across the filter, silencer, discharge pipeline and the final system drop does not exceed the specified limits.

The power consumed by the blower is directly proportional to the discharge pressure / system back pressure. A good system layout would offer power saving and higher efficiency. It is, therefore, important to ensure that proper care is taken during piping design and installation.

Where the Pressure is Lost

Pressure losses in ducting are caused by skin friction, flow separation, change in flow direction due to bends, turbulence, and restrictions to flow – caused by valves etc. Any saving in the pressure loss is a direct saving on the power consumed.

While designing a duct, certain areas need to be taken care of Size the pipeline to maintain average air velocity of 15 to 20 m/sec. High velocity results in higher ‘skin friction’ loss and higher dynamic velocity head. The frictional losses are a function of velocity and pipe surface conditions, so always ensure that smooth pipes are used.

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