In our company’s reorganization unit, the large cold ammonia compressor has a low exhaust temperature upon startup; loading is prohibited and an energy level alarm is triggered
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The model of the large-capacity ammonia compressor is JZVLGA193D. When it is started, the motor frequency is 40HZ and the motor speed is 2400 revolutions per minute. The control panel suddenly gives an alarm stating “Low exhaust temperature; loading at this energy level is prohibited”. Is there a relationship between the low exhaust temperature and the allowed loading energy level? I can’t understand this alarm limit related to the AC power supply for moving equipment in refineries and petrochemical plants
At that time, the exhaust temperature was 30 degrees; it was only after performing a \"temperature calibration\" to force the temperature to 35 degrees that the energy level could be added
The unit requires 35 degrees before it can be loaded? That’s quite interesting
A low exhaust temperature may be caused by an excessive amount of refrigerant being drawn in at the inlet, which is harmful to the screw compressor.
An excessively low exhaust temperature indicates a low inlet temperature, and further loading may lead to supercooling
A low discharge temperature indicates a low compressor inlet temperature or wet compression, which can lead to poor oil separation within the unit and result in oil leakage; in severe cases, this can damage the compressor