Reciprocating Compressors

Large, low speed machines are more efficient than smaller (cheaper) high speed units. Also, valve and bearing life is longer giving reduced maintenance cost.

Traditional compressor control is step -wise through the use of suction valve unloaders. Capacity is therefore typically 0% (at start-up) ~25%, ~50%, ~75% and 100%. Where the process requires some intermediate flow, it is normally achieved by spilling flow back from discharge to suction. This wastes energy. Further, operators often do not make best use of the step controls, needlessly increasing spillback and energy wastage. There are two solutions:

• Variable volume clearance pockets at the outboard end of the cylinders - manual or automatic.

Managing CO2 Emissions in the Chemical Industry. Edited by Leimkuhler © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim ISBN: 978-3-527-32659-4

• Rapid acting hydraulic suction valve unloaders which operate at a variable percentage of each piston stroke.

It is often found that the energy saved when using valve unloaders is far less than expected. This is usually due to excessive pressure drop across the valves even when being held open. The solution is to select valves properly engineered for the service.

For existing machines, check the effect on motor amps at the various unloader settings. If the reduction falls short of expectations, investigate the valve design.

Trash Cash Machine

Trash Cash Machine

How recyclable trash can save the world and bank us huge profits! Get All The Support And Guidance You Need To Be A Success At Recycling! This Book Is One Of The Most Valuable Resources In The World When It Comes To How To Make Profits With Trash!

Get My Free Ebook

Post a comment