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Dispersion Of H2S


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#1 farhan ahmed

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Posted 04 June 2018 - 01:48 AM

I want help regarding the dispersion analysis for H2S insided the pit.

 

Can anybody help me or refer me any specific calculation method to do above.

 

Project Scope:

 

A new closed drain vessel in placed inside the open pit below ground level. We want to perform dispersion of H2S inside the pit.

 



#2 thorium90

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Posted 04 June 2018 - 02:11 AM

To clarify, H2S is denser than air and you want to find out the rate of dispersion of the H2S inside a pit that is underground?

Sounds more like collection than dispersion to me.

 

So the assumption here is that because the pit is open at the top to the atmosphere, so the H2S being dissipated at the top will always be faster than the H2S being produced in the pit and therefore the concentration in the underground pit will reduce over time?


Edited by thorium90, 04 June 2018 - 02:15 AM.


#3 Technical Bard

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Posted 04 June 2018 - 08:26 AM

It won't disperse.  H2S collects in low places because it is heavier than air.  You cannot have a release in a pit and expect it to disperse into the atmosphere.



#4 farhan ahmed

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Posted 07 June 2018 - 03:20 AM

Thanks for your replies 

I have made convinced my client for the same



#5 thorium90

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Posted 07 June 2018 - 04:16 AM

You can still make it disperse though. Not naturally anyway.

 

Place 1 fan (Fan-1) at the ground level with a duct going to the bottom of the pit.

Place 1 more fan (Fan-2) at the ground level on the side of the pit with a duct coming out from the pit.

 

Fan-1 will blow fresh air into the pit from one side. Fan-2 will extract air from the bottom of the pit at the opposite side. Either run the fans continuously or have some detectors inside that trigger the start and stop of the fans.






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