Outlook to screw compressors today, featuring design basics, thermodynamics and testing evaluation of dry and oil-flooded rotor technology.
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An air compressor is a device that converts power (usually from an electric motor, a diesel engine or a gasoline engine) into kinetic energy by compressing and pressurizing air, which, on command, ...
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Basic Ba sics s Comp ompre resso ssorr Calcu lcula lation tion
Sven-Olaf Zillmann Project Manager Sales Head of Team Pipeline Process Industry
MAN Diesel & Turbo SE
Sven Olaf Zillmann
Basics Calculation Compressor
18.11.2013
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Basics Compressor Calculation For the calculation of a compressor two steps are necessary: 1. Thermodynamic calculation 2. Mechanical calculation
The compressor is a volumetric machine due to the geometry of the impeller
MAN Diesel & Turbo SE
Sven Olaf Zillmann
Basics Calculation Compressor
18.11.2013
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Basics Compressor Calculation Thermodynamic calculation Step 1: get the usual process data The needed data are: Volume (mass) flow, inlet & outlet pressure, inlet temperature, molecular weight (gas composition)
1. Lateral analysis To find out the lateral eigenfrequencies of the compressor. The excitation comes from the gas dynamic and the mass distribution on the shaft.
2. Torsional analysis To find out the torsional eigenfrequencies of the whole train. The excitation comes from the driver e.g. motor or gas turbine. A motor with a frequency converter is more complicated than a gas turbine.
The lateral analysis must be done to ensure the stability of the compressor. The analysis shows if the compressor runs in or near the natural eigenfrequencies (lateral critical speed).
The torsional analysis must be done to ensure the stability of the whole train. This includes the compressor, gear (if necessary) and the driver. Especially if a VFD motor is the driver of the train. A VFD creates an excitation by running in part load. This is typically for an VFD.
MAN Diesel & Turbo SE
Sven Olaf Zillmann
Basics Calculation Compressor
18.11.2013
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Disclaimer
All data provided in this document is non-binding. This data serves informational purposes only and is especially not guaranteed in any way. Depending on the subsequent specific individual projects, the relevant data may be subject to changes and will be assessed and determined individually for each project. This will depend on the particular characteristics of each individual project, especially specific site and operational conditions.