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H2 Vent


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#1 A.Kangaris

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Posted 07 September 2020 - 09:50 AM

Hi,

 

If you have a batch reactor, where Hydrogen is produced over time. What's the best way to avoid explosive atmospheres by H2 accumulation. Reactor is closed. 

 

N2 is an option. Would you recommend anything else?



#2 thorium90

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Posted 07 September 2020 - 10:21 PM

Would dilution with large amounts of air be possible? We commonly do this air dilution in electrochlorination plants.



#3 Chemitofreak

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Posted 08 September 2020 - 01:58 AM

Hi,

 

I used to work in a plant where Hydrogenation reaction was carried out, it was batch operation at the end of the cycle we use to remove unreacted hydrogen with the help of a steam ejector and released it to atmosphere at safe location. The steam will dilute the hydrogen concentration below the flammable limit.

 

Regards 



#4 breizh

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Posted 08 September 2020 - 03:07 AM

Hi,

Can you describe your process ? How do you operate currently ? Do you monitor the H2 content to ensure you are below the limit of explosivity before opening the manhole ? I'm aware of explosion of reactor with fatality due to wrong operation during the replacement of catalyst .

Breizh 

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Edited by breizh, 08 September 2020 - 03:40 AM.


#5 A.Kangaris

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Posted 08 September 2020 - 07:22 AM

 

Hi,

Can you describe your process ? How do you operate currently ? Do you monitor the H2 content to ensure you are below the limit of explosivity before opening the manhole ? I'm aware of explosion of reactor with fatality due to wrong operation during the replacement of catalyst .

Breizh 

 

Hi Breizh,

 

 

So I am working on the scaleup of a process that currently only lab tests have been done.The first scale up will be a pilot size plant (1.5m3 reactor). We will monitor H2 content as a safety control, but we would like to make sure that no H2 builds up in the reactor (which won't be tight closed, since we need to attach a funnel for solid feeding). H2 is produced as a by-product depending on the different conditions (it's still something that needs to be tested). 

 

Hi,

 

I used to work in a plant where Hydrogenation reaction was carried out, it was batch operation at the end of the cycle we use to remove unreacted hydrogen with the help of a steam ejector and released it to atmosphere at safe location. The steam will dilute the hydrogen concentration below the flammable limit.

 

Regards 

Hi,

 

Were all your moving equipment ATEX?



#6 Chemitofreak

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Posted 09 September 2020 - 02:13 AM

Yes, the rotating equipment were ATEX certified



#7 breizh

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Posted 12 September 2020 - 07:26 PM

Hi ,

To add to the previous answer, make sure all equipment are ATEX certified  i.e motors but also junction boxes, electrical start/stop, Instrument accessories ,etc 

Pay attention to the zone classification .

 https://www.hse.gov....easareaclas.htm

 

Good luck

Breizh 



#8 A.Kangaris

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Posted 15 September 2020 - 06:34 AM

Many thanks for your useful information! Much appreciated it!






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