In a 150-kilometer refined hydrogenation unit, if no water is added, problems will arise after a certain period of time, in the form of ammonium salt crystallization.
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Water injection issues in high-pressure hydrogenation units
Depending on the sulfur and ammonia nitrogen content in your feedstock, water injection generally cannot be stopped during high-pressure hydrogenation.
Based on the characteristics of the raw materials, if the sulfur and nitrogen contents are high, crystallization will occur shortly after water injection is stopped. However, crystallization and clogging are two different things.
The hydrogenation unit owned by the poster is incredibly long – longer even than the distance from Beijing to Tianjin. I would like to ask how much money was spent on your pipelines?
The chloride ion content in the recycled hydrogen and the ammonia nitrogen content in the feed are key factors determining the conditions for ammonium salt crystallization.