Acidic gas components in solvent regeneration of sulfur recovery units
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Is there ammonia in the acidic gas produced in the solvent regeneration section of the sulfur plant? According to the instructions provided by our company’s design institute, over 95% of the components in this regenerated acidic gas are hydrogen sulfide. However, in actual production, the pipelines running from the regeneration tower to the regeneration reflux pump, as well as those carrying the regenerated acidic gas to the sulfur production furnace, often get clogged. The cause of these blockages is likely the formation of ammonium salts, which means that the acidic gas contains ammonia. Where does this ammonia come from? Where does the ammonia in the regenerated acidic gas originate from?
There is ammonia, which includes the degradation of ethanolamine; however, its concentration is very low, estimated to be in the ppm range. There is also the issue caused by each desulfurization tower: the washing of the gas with ammonia prior to desulfurization is not effective.
It’s probably due to the ammonia injection by the upstream unit.