What is the priority order of the interlocks in the hydrogenation unit?
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As the title suggests, a beginner in hydrogenation is seeking help from experts!
I need guidance on all the interlocks in the hydrogenation refining reaction section, excluding those related to equipment protection. Please help!
In fixed-bed hydrogenation units, all interlock designs are aimed at protecting the catalyst while ensuring the safety of personnel. As for the priority levels you mentioned, in our case there was no such distinction originally; instead, interlocks were classified by their importance as primary interlocks, secondary interlocks, etc. The most critical interlock in hydrogenation and refining is (1) stopping the feed and the heating furnace, while also ensuring the operation of the turbine; otherwise, it’s necessary to activate the emergency pressure relief system to prevent the catalyst from overheating； (2) It is a turbine fault interlock; the entire system comes to a complete stop, and the emergency pressure relief valve is opened to cool the catalyst.
Are you guys using a newly installed device?
Does emergency pressure relief cause damage to the catalyst?
For example, when the emergency pressure relief interlock is activated, the subsequent feed pumps, main burners, and new hydrogen compressors will stop – this is the secondary interlock. When the circulating hydrogen compressor shuts down, the emergency pressure relief system along with all the pumps involved in this interlock are activated – this is the primary interlock. This is my personal opinion