Reforming pre-hydrogenation reactor dipleg
Thread Content
Recently, the pressure difference in my unit’s pre-hydrogenation reactor reached as high as 0.9 MPa, requiring a shutdown for cleaning. I would like to ask everyone: Has your device encountered similar problems?
0.9 MPa is indeed a bit high. Our company’s reforming pre-hydrogenation system had an issue for the first time; after replacing some of the protective agents, it returned to normal operation.
0.5 is already quite significant; your company is truly impressive
I would like to ask how the outlet pressure and outlet temperature of your reciprocating compressors are controlled; can they be set to 0.9?
The maximum pressure at the compressor outlet reaches 3.20 MPa. However, the flow rate has now been reduced, with the compressor outlet pressure at 3.0 MPa.
The pressure difference across the catalyst bed in our hydrogenation unit reached as high as 1.12 megapascals; after regeneration and purging, this pressure difference dropped back to below 0.2 megapascals.
When our company reaches 0.6 MPa, we already back off; I think that’s a pretty high level. You guys are really good at this – it’s quite dangerous
The pressure difference in the reactors of each unit is related to the scale of the unit, as well as the catalysts and compressors used; it varies from one unit to another, and the allowable operating pressure difference also differs. For a pre-hydrogenation unit with a capacity of 1.6 million tons, the allowable pressure difference is around 0.5 KG/CM2; if it exceeds 1.0 KG/CM2, then measures to reduce the pressure need to be considered. When performing head-turning operations, safety must be taken very seriously; ferrous sulfide can easily catch fire on its own. The catalyst used for protection is removed from the reactor using a vacuum pump in a nitrogen-filled environment. The amount of nitrogen used should not be too high, so as to maintain a slight positive pressure in the reactor; if the vacuum pump starts operating, the amount of nitrogen should be increased slightly. The removed catalyst must be kept soaked in water; otherwise, ferrous sulfide will catch fire on its own. If the original poster is looking for information on turning the head, I have some.
It is recommended to install high-precision filters at the pre-hydrogenation feed stream to prevent mechanical impurities from entering the reaction system and causing shutdowns for cleaning； This pressure drop of 0.9 MPa is indeed very high; it must have exceeded the set pressure value of the safety valve
When we turn our heads, the catalyst is stored in iron drums with lined bags; once the catalyst fills the lined bag, it’s sufficient to seal it with dry ice. Can’t using water on the catalyst completely ruin it?
0.9.. . . You are so mighty