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3

Ejector Or Blower?


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#1 MARYAM-NIKA

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Posted 07 September 2020 - 03:17 AM

Hi,

What method do you suggest to increase the pressure of a stream with high value of sulfur contents (more than 50% mole fraction H2S, COS and mercaptans) from 0.2 barg to 0.8 barg? Flow rate is 1000 kg/hr with intermittent service.

Blower or steam ejector?

 



#2 Sharma Varun

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Posted 07 September 2020 - 04:35 AM

please provide more details of the Process.



#3 breizh

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Posted 07 September 2020 - 05:45 AM

Hi,

Let you share a PFD or simple PID .

Breizh 



#4 MARYAM-NIKA

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Posted 08 September 2020 - 12:28 AM

Hi

In my project there is an Acid gas stream with high value of sulfur content (more than 50% mole fraction H2S, COS and mercaptans) from top of regenerator that shall be sent to SRU. But its pressure is not adequate to overcome B.L. pressure because of some limitations on HP steam provision in regeneration reboiler. For pressure increasing according to very corrosive service which method is proposed, ejector or blower?

Flow rate is 1000 kg/hr

Pressure is 0.2 barg (B.L. pressure is 0.8 barg)

At present there is not any PFD or PID. 



#5 breizh

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Posted 08 September 2020 - 01:17 AM

Hi,

You may find some pointers in the link attached , in particular bulletin 4F and 4F supplement  

https://www.s-k.com/...compressors.cfm

 

You should be able to find more info using your favorite search engine .

Note : For non corrosive material  you should consult vendors ( graphite , Teflon or exotic material like Hastelloy )

Hope this helping you .

Breizh 



#6 Jiten_process

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Posted 20 September 2020 - 01:11 AM

I think, you are talking about regenerator of Gas sweetning unit. There are ways to transfer vapors from regenerator depending on your downstream system. 

 

In of the project I worked, we had low pressure vapor, generated from regenerator of TEG units, to be sent to acid gas compressor suction. The pressure levels were similar to yours. We employed ejector in that. However, you need a motive fluid for the ejector. We have used small portion of high pressure dry gas as motive fluid for ejectors. In your case, you should evaluate whether you have motive fluid with sufficient pressure and is it worth using it coz, motive fluid will be lost in acid gases. 

 

Consider using, liquid ring compressor also. They are widely used these days in vapor recovery system e.g. for regenerator overhead vapors in TEG units, flashed vapors from low pressure storage tanks, etc.  

 

Also, i am not sure, which technology you are using, but consider increasing the regenerator pressure if you can. For TEG units, you are bound to operate at low pressure but for certain GSU units, you can go with higher pressure regenerators. 

 

Good luck. 


Edited by Jiten_process, 20 September 2020 - 06:33 AM.





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