7 replies to this topic

[hemantwarhekar]

Experts,

For 1000 m3/hr  non condensable load out of it 10% is only condensable load at 470 torr, can I use water jet ejector. I got some inputs , for such huge non condensable load, water jet ejector should not be used.

Your view please  

[PingPong]

Consider a water ring pump.

 

Or otherwise a compressor.

[ankur2061]

hemant,

 

Where did you get the information that liquid jet ejectors cannot handle large non-condensable loads? I have used liquid jet ejectors for evacuating process reactors containing large amount of non-condensables and they work fine. Korting is one of the leading manufacturers of ejectors (liquid / steam) and their brochure clearly mentions that liquid ejectors can be used for evacuating a process system containing process vapors (condensables) + air (non-condensables). Refer the links below:

 

http://www.koerting....-vacuum-ejector

 

https://www.koerting...s.pdf?sfvrsn=14

 

Since ejector design is still proprietary in nature and based on a lot of actual testing, manufacturers specializing in this field can provide you a tailor-made design which can suit your application.

 

Hope this helps.

 

Regards,

Ankur.

[PingPong]

Choice between ejector and water ring pump is purely economical.

 

If it is only used to evacuate equipment at unit start-up then an ejector is fine.

 

For continuous operation with large quantity of noncondensables it becomes a more difficult choice.

Edited by PingPong, 23 January 2014 - 06:34 AM.

[katmar]

It is all a balance between purchase cost and running cost.  An ejector is cheap to buy, but expensive to run.  Relative to this, a liquid ring pump is more expensive to buy, but cheaper to run.  An ejector requires very little technical expertise to run it, but a liquid ring pump requires skilled maintenance staff.  You have to evaluate each case on its merits.

[gegio1960]

Dear PingPong and Katmar,

maybe I'm wrong but liquid ejectors are very different from liquid ring vacuum pumps...

Kind regards

[PingPong]

Yes, we know.

 

To produce and maintain a vacuum one can use a liquid ejector, or a steam ejector, or a liquid ring pump, or a more conventional compressor.

 

Each has its advantages and disadvantages with respect to investment cost, operating costs, maintenance, .......

[breizh]

Consider this literature  to support .

 

Breizh