sour water stripping unit
sour water stripping unit
(OP)
what is the best solution to minimize the very high corrosion rate at the overhead system of the sour water stripping unit ?
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS Come Join Us!Are you an
Engineering professional? Join Eng-Tips Forums!
*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail. Posting GuidelinesJobs |
sour water stripping unit
|
RE: sour water stripping unit
RE: sour water stripping unit
Ben Spooner, P. Eng
Process Engineer
Amine Experts Inc
Calgary, Alberta
RE: sour water stripping unit
About two feet of hydrocarbons are allowed to float on top of the sour water for odor reduction. Cone roof tanks may require nitrogen blanketing for safety and odor control.
Escaping vent gases may need to be treated to answer to local environmental regulations.
Clearly, hydrocarbons in the feed stabilization tank should be removed before emptying the tank to prevent the SWS to become an oil stripper.
The feed, pumped on flow control, is generally pre-heated by exchange with outflowing stripped water. A LP steam reboiler is usually used rather than adding water by injecting live steam, thus saving condensate while operating the stripper at lower pressures.
I believe it was mentioned in the previous link that the top of the stripper should be kept above 180 deg F, to avoid sublimation of ammonia salts, that may plug everything, including the tower's overhead piping.
A particular problem arises when treating FCC waters containing cyanides which may require titanium overhead condensers to prevent corrosion under deposits.
One of the procedures to avoid using a condenser and reduce corrosion is using a pump-around cooling system. Pump-arounds, being liquid-filled systems wouldn't permit deposition of solid salts.
Good luck.
RE: sour water stripping unit
The question is if we install corrosion inhibitor dosing system at the top of the sour water stripper will it be the ultimate solution of this problem ?