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Surge control valve sizing criteria

asked May 11, 2014 in Simulation by cobiesmith (3,310 points)
Can anybody share compressor surge control valve sizing criteria?

1 Answer

+1 vote
answered Jul 30, 2014 by ChemKB (8,210 points) | selected Jan 10, 2015 by ChemKB
 
Best answer

Valve must reduce the pressure across the compressor by half in the same time as the compressor loses 30% of its speed (fan law).
About 50% of the recycle valve capacity should be attributed to depressurize the discharge volume trapped between the compressor, check valve, and recycle valve as shown in figure below in red:

Rest of the of the recycle valve capacity (50%) will recycle the gas flowing across the compressor.If the discharge volume is to large then a hot recycle may be considered as shown below:

Although, the large recycle valve may be required to avoid the surge but unfortunately it can create controlablity issues during partial recycle.

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