Why does the anti-surge valve of the air compressor open abnormally?
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The anti-surge valve of the air compressor is primarily used to prevent surge in the compressor caused by low flow rates during startup and shutdown; under normal conditions, this valve remains closed. However, recently the anti-surge valve of the air compressor has opened abnormally, with an opening degree of around 10%. The inlet pressure and temperature of the air compressor, as well as the position of the inlet guide valve and the outlet pressure and flow rate of the compressor, are all within normal ranges. The cause of this issue is unknown Please analyze this: our anti-surge calculations are a Siemens patent, and the calculation principles and control mechanisms are not available, so it’s impossible to explain why this is the case. I was wondering if any experts are aware of this. Thank you!
First, check the output of the valve; if it is 10%, then it has nothing to do with the valve itself. Since you mentioned that there are no differences in the process parameters, it is recommended to determine whether each parameter differs significantly from its normal value by examining the trends or operation records. If there are no such differences, it can be assumed that the issue lies with the instruments. It’s possible that what is shown on the DCS or similar systems appears normal, but the instruments connected to the anti-surge system indicate deviations, which can lead to this situation. It is advised to contact the instrument technicians and request a thorough inspection.
In winter, the temperature is low and the air density is high. If your air compressor is motor-driven. The actual flow rate is slightly higher than in summer. Not that much air is needed in the process. After the anti-surge valve is set to automatic mode, interlock action occurs. Release some of the unnecessary air. Protect the equipment.
Reply to 3# daqing01: Thank you. However, this problem did not occur in previous years. Moreover, the density is high in winter; under the same mass flow rate, the volume flow rate decreases, but it does not drop to the point of causing surge