Surge in centrifugal refrigeration compressors
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When a centrifugal refrigeration compressor experiences surging, the measures that can be taken are ( ): A: Increase the spray flow; B: Raise the suction pressure at the first stage; C: Remove non-condensable gases from the system; D: Open the flare valve at the compressor outlet
Possible measures (B\C\D)
This process condition can also occur when the temperature is too low.
When a centrifugal refrigeration compressor experiences surging, the measures that can be taken are (D\B): A: Increase the spray flow; B: Raise the suction pressure at the first stage; C: Remove non-condensable gases from the system; D: Open the flare valve at the compressor outlet
Analyze specific issues on a case-by-case basis. The DCS anti-surge valve will operate automatically
Possible measures (B\C\D)
D: Open the compressor outlet flare valve
First, the refrigeration process must be clear. 1. It’s rehumidification – too low temperature and too low pressure. 2. It is necessary to understand what causes surging; it is due to poor exhaust flow, which leads to turbulent airflow. 3. The operation of the centrifugal compressor and refrigeration must be coordinated. 4. What type of refrigerant do you use, and what is the thermal condition?
This is asking for answers to an exam! From a fundamental perspective, to overcome surge it is necessary to increase the volumetric flow rate at the compressor inlet; by applying the principle of momentum, the answer can be obtained.