Noise reduction at Air vent 1

[pno1899]

Hi every one
i got a project of reducing noise at air vent

air is required by process and it is provided by two air compressors the excess quantity is vented to atmosphere
the venting of air produces much noise almost 120db. so we have to reduce that noise.
what you suggest??

 

[aliansari]

Venting into atmosphere is always noisy due to the pressure differential. Install a suitable silencer at the vent. Either you can directly purchase it from a vendor or built it in house. Simple design, employing retardation of velocity by increasing the cross sectional area. Internal design may include perforated annular pipe or packing like steel wool to break the velocity and bring it down to a level where noise level drops well below 80 DB

 

[LittleInch]

Alternatively install an air receiver and allow the compressors to turn on and off to avoid venting.

Vented compressed air is literally venting the money you've used to compress the air in the first place. Work out how much that is so you can use it in some arguments about what to do.

If it's a sizable amount, or even not - why not use the air to do something useful like generate electricity?? This would reduce the air velocity and take out the energy which is being converted to noise.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[pno1899]

well turning on and off the air compressor is much costly as they are steam driven and lots of startup and shutdown work..so not a better choice
air flow require is varying from 50000NMC/hr to 55000NMC/hr and compressor discharge is almost60000NMC/hr

 

[crshears]

Steam-driven? Would it not be possible to throttle steam flow to turbines [presuming they're turbines & not reciprocating steam engines...] in order to control output with far less energy loss? Check for critical turbine speeds, of course, but in my view it would be well worth looking into.

CR

"As iron sharpens iron, so one person sharpens another." [Proverbs 27:17, NIV]

 

[georgeverghese]

Is this venting of 5000Nm3/hr continous during normal operations? Why?
As suggested, it is usually possible to set up process controls to adjust machine speed to match flow demand with supply by using discharge pressure control, wihtout having to vent any excess.
During startup and shutdown, yes, it is possible that some air will be vented.