Reasons for the rapid increase in bed pressure difference in the paraffin oil hydrogenation reactor

1. Instrument failure. 2. The raw material contains impurities such as coke powder, resulting in poor filtering efficiency. 3. Water in the raw material enters the system. 4. The unit undergoes emergency pressure relief; the rapid rate of pressure release crushes the catalyst. 5. Large fluctuations in the operating temperature and feed rate of the unit. 6. Poor mechanical properties of the catalyst, leading to the breakdown of catalyst particles. 7. Uneven packing of the catalyst, causing localized coking. 8. Excess levels of metal, resin, asphaltenes, etc., in the raw material being processed

In the short term, fluctuations are mainly due to raw material effects; other factors are likely possible causes

Reply to 1# gz7513: The pressure difference generally rises rapidly at first, then stays stable for a while, before rising again quickly until operation stops. Which stage are you referring to?

It is difficult to analyze the causes of pressure differences, as they are influenced by various factors. In my humble opinion, the reasons that may lead to an increase in pressure drop include: 1) The feed oil is not controlled in accordance with the process specifications, and this is often due to issues upstream. Affected by the deep vacuum stripping of petrochemical units in recent years, most such units experience this phenomenon ； If there is coker wax oil present, it may be due to poor control in the coking distillation tower, which results in a large amount of coking powder being carried along. 2) If it is the commissioning of a new unit, was it as analyzed by the aforementioned colleague – that the catalyst is not dried or contains water? ! Therefore, after driving, the catalyst may break apart, and the fragmentation of a large amount of catalyst leads to an increase in pressure drop. 3) The filter operates with the bypass line connected for an extended period. A large amount of impurities enter the reactor, and once saturation is reached, the pressure drop in the reactor increases. 4) Change in compressor speed. I hope everyone can add more

Additional note for Floor 6: Almost everything was covered on Floor 6. My suggestion is to pay attention to changes in the Fe ion content in the raw materials, to see if it exceeds the specified limits； Pay attention to the operation of the backwash filter, check for any faults, and see if there have been any actions related to connecting or disconnecting the filter’s auxiliary lines ； Is the level of olefins in the raw materials excessive, resulting from condensation? ； I suggest checking the iron ions in the raw materials, as this is usually the main reason for the increase in differential pressure ；