Sulfur recovery unit shut down
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I would like to ask the teachers: when should the exhaust hydrogenation section and the sulfur production section be disconnected during the shutdown of the sulfur plant? Before gas desulfurization?
The environmental-friendly shutdown scheme for the sulfur recovery unit, namely using hot nitrogen to blow off sulfur, can be considered!
Follow your operating procedures. It has been observed both after cutting off acidic gases and after sulfur blowing.
When gas enters, a peroxide state exists, so it needs to be cut out. But this is a traditional requirement
In the past, when environmental emission requirements were not strict, it was common to remove the exhaust hydrogenation section in advance before carrying out sulfur injection, which could effectively protect the hydrogenation catalyst. Nowadays, environmental regulations are stricter; generally, it is done after sulfur blowing is completed. It mainly depends on how the operating procedures and shutdown plans are formulated. Work documents cannot be changed arbitrarily.