Continuous reforming catalyst regeneration
Thread Content
Does the raw catalyst flowing out of the reactor in the UOP continuous reforming unit need to be cooled before being lifted? What is the temperature usually? Why is it necessary to cool the regenerated catalyst before it exits the regenerator? Does the catalyst in the IFP continuous reforming unit also need to be cooled when being transferred between reactors?
1. The raw catalyst flowing out of the reactor in the UOP continuous reforming unit does not need to be cooled before being lifted； The temperature is usually around 120°C ； Reason for cooling the regenerated catalyst before it exits the regenerator: First, to recover the heat generated during the regeneration process ； Second, reduce the load on the air heater ； Third, it reduces the requirements for the materials used in nitrogen-sealed tanks, thereby lowering investment costs. 2. The catalysts used in the IFP continuous reforming unit do not need to be cooled during transfer between reactors, and the reason for this is, firstly, that it helps to reduce the energy consumption of the unit ； Secondly, it can prevent the catalyst from experiencing sudden temperature changes, thereby extending its service life ； Third, ensure stable operation of the reaction system.
The temperature of the UOP catalyst before use drops after being flushed with purge gas in the collector; in addition, some of the secondary gas also enters the collector through the catalyst pipes, causing the catalyst to cool further. By the time the catalyst reaches the separation hopper, its temperature is generally below 100°C. The design temperature for the separation hopper is usually 120°C, while the operating temperature is around 60°C. The purpose of cooling the regenerated catalyst before it exits the regenerator is, on one hand, to reduce the material requirements for downstream equipment, and on the other hand, to facilitate the reduction of the catalyst. The catalysts in the IFP continuous reforming unit do not require cooling when being transferred between reactors; likewise, their temperature decreases due to the presence of the purge gas.
The answers on floors 2 and 3 are very comprehensive; the UOP catalyst regenerator is equipped with a cooling section, which serves to cool the catalyst as well as recover a large amount of heat； The raw catalyst is purged with clean gas, which serves to reduce its temperature; at the same time, the flowing gas also plays a role in cooling and heat exchange.
Reply to 2# Zhongyuanren, senior: I work in restructuring as well, and I would like to ask you a question! Why is the isolation pressure difference for the raw material set at 25 kPa? But in reality, it doesn’t reach 25 kPa How is 25 kPa calculated? Thank you!
A high differential pressure can hinder the descent of the catalyst; the calculation method is 560 kg/m3 × height difference × g – for a height of 6 meters, this results in 33.6 KPa, which is above the limit. When the green body fails to descend, its height generally exceeds the limit. However, if the pressure difference increases, the falling speed will decrease. As long as the controlled value is greater than 2.5 Kpa, interlock will not occur, allowing for flexible adjustment.
That’s so professional, guys upstairs – I’ve seen it
The fluidized state density of the catalyst is much lower; the value of 560 KG/M3 refers to the bulk density. Therefore, the pressure resulting from calculations is lower. We control the pressure difference across the catalyst bed at only 15 KPA – as long as the oil and gas do not flow downward, that’s sufficient
Is my master’s online nickname also “Heartless Virtual Network”? Aren’t you? :)
What does the height difference refer to? Is G the weight of the catalyst?
Hehe, I’m from Tianjin; I’m not sure if that counts