Hydrogen interlock
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Currently, there are too many interlocks in hydrogenation units designed for wax oil, residue oil, gasoline, diesel, etc. – which ones are essential and which ones can be omitted? Please share your opinions.
Since it’s interlocking, it must all be necessary. But with the circulating hydrogen compressor stopped, 0.7 MPa/min must be the most critical factor.
For hydrorefining, 0.7 Mpa of emergency pressure relief should be sufficient; 2.1 Mpa of emergency pressure relief is not necessary.
1. Compressor shutdown – Reactor feed heater； 2. Stop the feed pump to shut down the feed heater. 3. High pressure low level interlock. 4. Hydrorefining has a pressure relief interlock at 0.7 MPa/min; hydrocracking has pressure relief interlocks at 0.7 MPa/min and 2.1 MPa/min.
Personal opinion: From the perspective of intrinsic safety, interlocks are the best solution. In high-risk petrochemical installations, the safety of such installations cannot be ensured through human \"careful operation\"; it must be based on intrinsic safety. Therefore, there is no need to consider removing or disabling interlocks
Interlocks must be installed at all flammable and explosive areas during hydrogenation
Ladies and gentlemen: Diesel hydroprocessing (8. 0MPA) device – is an automatic interlock required for pressure relief at 0.7 MPa/min? Manual pressure release should work, right?
Although interlocks are beneficial for the safety of equipment, they often cause disruptions to production, or even lead to shutdowns, due to minor issues. Nowadays, there are not many production facilities that actually use interlocks
From the perspective of intrinsic safety, interlocking is the best approach.
Hydrogenation chain includes: 1. The cycle compressor stops, and the reaction feed heater is shut down； 2. Stop the feed pump to shut down the feed heater. 3. Interlock valve for high pressure and low liquid level. 4. Main burner shuts off due to low gas pressure ； ⒌Stop the feed pump when the level in the feed tank is low ； ⒍Hydrorefining has a pressure relief interlock at 0.7 MPa/min; hydrocracking has pressure relief interlocks at 0.7 MPa/min and 2.1 MPa/min. Wait, I think: there’s no need for a interlock that shuts down the feed heater when the feed pump stops; such an interlock isn’t used in reformation pre-hydrogenation.
From the perspective of intrinsic safety, interlocks are a necessary means for the safe operation of a device. Most hydrogenation unit interlocks include: 1. Shutdown of the cycle compressor and the reactor feed heater ； 2. The feed pump stops, and the feed heater is shut down ； 3. Interlock valve for high pressure and low liquid level ； 4. Main burner shuts off due to low gas pressure ； ⒌It is necessary to shut down the feed pump when the level in the feed tank is low, among other things.