What causes the hydrogen sulfide and carbon dioxide levels in the sulfur recovery lean solution to be above the specified limits?
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Dear sea friends: For the past week now, the levels of hydrogen sulfide and carbon dioxide in the lean liquid from our sulfur recovery unit are above the specified limits. What’s going on?
There should be very few cases where carbon dioxide exceeds any limits; we don’t have any such limits here, so in special situations we don’t pay attention to it either – it’s likely to be less than 0.01. There is a relatively high possibility of internal leakage in the amine liquid heat exchanger for rich and lean streams.
Thank you, we’re going to check it.
Where was the lean liquid sampled for analysis? If, in front of the rich-lean liquid heat exchanger at the bottom of the tower, the main considerations are regeneration and heat exchanger leakage
Analyze whether there are any changes in the indicators of the lean solution, and gradually address the issues
First, check whether the operations are normal, that is, whether the bottom temperature and pressure as well as the top temperature and pressure are the same as usual. Generally, with a tower top temperature of 110°C and a pressure of around 0.06 MPa, the lean amine solution is definitely qualified. Otherwise, it is necessary to suspect internal leakage in the rich-lean liquid heat exchanger; sampling before and after the heat exchanger for analysis will confirm this.