Why we are adding air to off gas
Unread post by Sravan » Tue May 21, 2019 7:11 am
It has given that not to form the explosive mixture. How that explosives are forming?
And if we add air continuously,what about load on the recovery system
And if we add air continuously,what about load on the recovery system
- ntact pbaboo
Re: Why we are adding air to off gas
Unread post by pbaboo » Wed May 22, 2019 11:26 am
Dear Sravan Kumar,
Your Process is MTC so, the whole air given to CO2 compressor in suction line for passivation. Your process is conventional type means you have no stripper. The passivation air should be just sufficient for passivation because finally all the inerts vent out through M.P. section along with inerts some amount of ammonia also loosed through it.
In non-conventional or stripping process some amount of air given to stripper bottom for bottom dome passivation however Titanium stripper not required additional air for passivation some dissolved oxygen is sufficient for passivation.
The CO2 having some amount of Hydrogen so the chances of explosion in MP section.
There are following manner to avoid explosive mixture
1. To remove Hydrogen in CO2 Compressor.
2. To add NG in MP condenser (in case of recovery of inerts gas as fuel.)
3. To add steam in MP vents d/s if inerts gas not recovered (vent to B/D)
Danger of Choking Burner in case of recovering inerts as a fuel,
The NG is having some amount of CO2 (2-5% depends upon source), so the Carbonate/Carbamate formation takes place and resulted choking of burner to avoid this phenomenon Some separate burner to be used for inerts fuel don’t mixed with NG.
Some plants recovers these inerts as a fuels.
If you remove Hydrogen in CO2 compressor then No question from recovering fuel because fuel (Hydrogen) already remove from Compressor.
https://www.ureaknowhow.com/ukh2/round- ... sive#p2357
https://www.ureaknowhow.com/ukh2/board/ ... php?id=685
Your Process is MTC so, the whole air given to CO2 compressor in suction line for passivation. Your process is conventional type means you have no stripper. The passivation air should be just sufficient for passivation because finally all the inerts vent out through M.P. section along with inerts some amount of ammonia also loosed through it.
In non-conventional or stripping process some amount of air given to stripper bottom for bottom dome passivation however Titanium stripper not required additional air for passivation some dissolved oxygen is sufficient for passivation.
The CO2 having some amount of Hydrogen so the chances of explosion in MP section.
There are following manner to avoid explosive mixture
1. To remove Hydrogen in CO2 Compressor.
2. To add NG in MP condenser (in case of recovery of inerts gas as fuel.)
3. To add steam in MP vents d/s if inerts gas not recovered (vent to B/D)
Danger of Choking Burner in case of recovering inerts as a fuel,
The NG is having some amount of CO2 (2-5% depends upon source), so the Carbonate/Carbamate formation takes place and resulted choking of burner to avoid this phenomenon Some separate burner to be used for inerts fuel don’t mixed with NG.
Some plants recovers these inerts as a fuels.
If you remove Hydrogen in CO2 compressor then No question from recovering fuel because fuel (Hydrogen) already remove from Compressor.
https://www.ureaknowhow.com/ukh2/round- ... sive#p2357
https://www.ureaknowhow.com/ukh2/board/ ... php?id=685
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