Anti-surge protection

[process5962]

Hi,
I'm new to compressors/blowers and would appreciate if somebody recommend me which parameter I could use for tracing and preventing the system approching surge conditions ( as a control loop). The problem is that Blower is expected to work in a very wide load range let's say from 30 to 100% of it's capacity and it has both IGV and VFD which on my opinion makes control / regulation even more compicated. Manufacturer doesn't offer any surge prevention, only inerlock which shuts down the blower in a surge conditions but I'd ruther go with preventing it than stop the blower which causes the whole downstream plant to be shut down.
I'm talking about centrifugal blower and it is a very big machine max capacity ~ 100000 m3/hr
Thank you in advance

 

[dcasto]

I'd go to a firm that specializes in such controls.

Othewise, measure output volume, correct for actual suction conditions, and adjust recycle to meet minimums per the curvr.. The use the VFD, you'll need to re calculate the mimimum flow and adjust the VFD output. This could be 1 loop with split range to the VFD/Recycle or two seperate loops.

 

[Turborecip]

Hello:

I would start with OEM (but since you mentioned that your OEM does not support). Companies like Dresser Rand , Solar provide surge controllers on their as well as other OEM machines. You might want to contact them and see if they can offer support on your system.

There are other control companies like CCC that offer surge controllers also.