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Motive Steam Of Ejector


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#1 Rizky Adi Nugroho

Rizky Adi Nugroho

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Posted 20 January 2015 - 02:08 AM

dear all

i have a question about steam ejector system,
are there any effects to vacum of surface condensor if we change the motive steam pressure higher than ejector design?
for example, the design specification of motive steam is 4,5 kg/cm2. because the vacum in the condensor is down, we try to change the motive steam from 4,5 kg into 12 kg/cm2 g to increase the vacum in the condensor
Thank you for your kind attention & your reply/advice would be highly appreciated.

 

 

-RAN-



#2 breizh

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Posted 20 January 2015 - 03:21 AM

Hi ,

That is not possible ! This equipment is designed on purpose .  You need to find the root cause of the lack of performance  ( dirt , leak,...) on the ejector and condensor. The nozzle may be eroded , what about the quality of the steam ....

Is it a new problem ?

 

Hope this helps.

Breizh


Edited by breizh, 20 January 2015 - 03:54 AM.


#3 Rizky Adi Nugroho

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Posted 20 January 2015 - 04:26 AM

so it is not applicable if we change the motive steam pressure higher than design

now, we are trying to find the root of this problem like air leakage in the condensor

your respons is very help us mr. Breizh

 

thx



#4 shan

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Posted 20 January 2015 - 01:55 PM

A steam ejector suck force is due to medium (steam) volume velocity.  If your higher pressure steam is able to flow through the ejector with higher volume velocity, the considered vacuum will be improved.



#5 pavanayi

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Posted 20 January 2015 - 05:34 PM

Rizky,

The factors pertaining to an ejector design are motive steam pressure and flow, suction pressure, suction mass flow and discharge pressure. These values and ratios betweeen them decide the nozzle dimentions and the area ratio within the ejector, which as Breizh mentioned lead to a custom design. There are limits to such ratios and thus ejectors are notorious for very poor off-design performance.

 

Check the ejector datasheet to confirm if your current operating conditions (suction stream flowrate, motive steam conditions etc) are as per the design. If still in doubt, a check with the ejector vendor might also help your investigation.



#6 Rizky Adi Nugroho

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Posted 20 January 2015 - 07:37 PM

thx all,

I would check  the ejector datasheet and make sure maximum allowable pressure motive steam
it is very nice, because I can discuss with you all

thank you
shan & pavanayi






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