Compressors control
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Jul 21, 2015
Grant Date -
May 17, 2012
app pub date -
Jul 18, 2008
filing date -
Aug 21, 2007
priority date (Note) -
In Force
status (Latency Note)
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Abstract
The invention relates to improvements in compressors and, in particular, to improvements in a method of controlling centrifugal compressors to maximize their efficacy. The compressor has an impeller mounted on a shaft supported by an active magnetic bearing unit and is driven by a variable speed motor at a rotational speed under normal on-load conditions at a calculated pre-surge speed for the required delivery pressure. The actual rotational speed and delivery pressure of the compressor is repeatedly measured and recorded at high frequency. The compressor is allowed to surge periodically after a preset re-calibration time and the compressor is put into a surge recovery cycle when surge is detected, during which the compressor is off-loaded and the rotational speed reduced. The compressor pre-surge speed line is recalibrated during the surge recovery cycle for the current operating conditions and reloads the compressor when the shaft speed reaches the greater of the recalibrated presurge speed line or the load speed.
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