Selection of centrifugal compressor power and motor power
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Example: Given that the power of a centrifugal compressor is 8000 KW, how can we determine the power of the motor required to drive it? What conditions are needed, and what is the relationship between them? Thank you. I’m not an expert in this field, so my questions may not be very professional. I hope experts can provide answers. Thank you.
The power of the motor should generally be about 20% higher than that of the compressor. Motors come in explosion-proof and non-explosion-proof versions, and there are also requirements based on the insulation level of the environment. As for cooling methods, there are air-cooled and oil-cooled types. Motors can be either synchronous or asynchronous. You can provide the parameters and requirements of your compressor and consult motor manufacturers.
Who can give a professional explanation?
Electric motors generally require that their load not exceed their rated value； When it exceeds the rated value, it must be for a short period of time. The power load of the compressor is related to the ambient temperature, suction pressure, and discharge pressure. The power load fluctuates up and down around the rated point. For this reason, the motor configuration needs to have a margin. Centrifuges are generally at 10–20%.
Regarding the power of the motor, you may refer to the specifications in API617; I don’t have this standard available at the moment, so I’m unable to give you an answer. However, for reciprocating compressors, according to API618, the motor power should be at least 110% of the compressor’s maximum shaft power. For compressors with high power levels, it is standard to select motors with a capacity of 110%; for compressors with lower power levels, values of 115% or 120% can also be used, and all of these options are reasonable. As for the ranges defined for high power and low power, you can refer to the relevant sections in Volume 2 of the \"Guidelines for Offshore Oil Engineering Design\"; the details are provided there, and this book is available on the forum. I believe the motor power requirements for centrifugal compressors should not differ significantly from those for reciprocating compressors. This post was last edited by brightpearl on 2009-4-4 17:53]
It’s a good exchange; nowadays production processes are becoming more diverse, with conversions from gasoline to electricity and vice versa. Such exchanges are meaningful.