What happens to acidic water exhaust gas?
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During catalyst sulfidation in the hydrogenation unit, as well as during normal operation, acidic water is generated in the high-pressure water separator and the stabilizer water separator. An acidic water tank is installed in the unit, and the acidic water is pumped to locations outside the facility. How should the exhaust gas discharge from this acidic water tank be handled? There will be hydrogen sulfide in the exhaust gases; at present, it’s not clear whether this gas should be sent to a flare or discharged into the atmosphere through a vent valve. I would appreciate some guidance from those with experience – reference diagrams would be helpful if available.
Hydrogen resources can be recovered through PSA desulfurization
The quantity is very small, and there are also no suitable conditions; thank you!
It should be sent to the gas holder for recovery; given current environmental regulations, releasing it into the atmosphere is not allowed.
A small water ring pump can be used to increase the pressure; in the past we would vent air, but that is no longer allowed nowadays.
For torches, it is also necessary to consider the design and set pressure
If you have a small capacity, going to the torch is more appropriate
Hydrogen sulfide is a highly toxic substance classified as Category A; according to the interpretation in Petrochemical Regulations 5.5.15, an acidic gas flare can be installed separately for it； Of course, it ultimately depends on the amount of gas that escapes. Additionally, if the gas volume is low, it is also possible to consult the RTO manufacturer to see if they can handle it or if a basic exhaust gas washing system can be used ； In general, it is necessary to meet the standard emission requirements.
Direct discharge is definitely not allowed; it can be directed to a flare, and there is no need to install a separate flare
It’s not allowed to release pollutants into the atmosphere; environmental regulations are becoming increasingly strict these days
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