What is the impact of reduced reformation feed on the regenerated portion?

I just heard a foreigner talk; I didn’t quite understand. Does it mean that less material is fed in, so there’s less ## inside the reactor? ##It is used to maintain regenerative operation (feeding? )So it might cause the regeneration to stop? What is ##?

There is a pressure difference between the reactor and the regeneration tower; if this difference cannot be maintained, it will cause the CCR to stop operating

We use French Axens technology; we haven’t seen UOP or domestic technologies； So here, I will share my experience with Axens’ CCR; please feel free to correct me if there are any mistakes. If all your operating parameters remain unchanged: the reaction temperature (in fact, most of the operating requirements decrease as the feed rate decreases), pressure, the temperature of the product after air cooling, the speed of the recycle hydrogen compressor, and the circulation rate of the catalyst in the regeneration section remain constant ； At this point, the reduced feed rate leads to an enhanced functionality of the reactive metal, which in turn increases the purity of the circulating hydrogen. This helps to prevent carbon deposition on the catalyst. When the catalyst circulation rate remains unchanged, the carbon content in the catalyst decreases; when it falls below 3%, the carbon deposits on the catalyst cannot be completely removed during the coking stage. If the regeneration unit is in the white burning phase at this time, it becomes very dangerous, as the remaining carbon deposits entering the oxychlorination section (with an inlet temperature of 510°C and an oxygen content of 4%–6%) can cause the temperature in that section to rise sharply. In mild cases, this leads to sintering of the catalysts in the oxychlorination section and rendering them unusable, while in severe cases it can damage the internal components of the oxychlorination unit

1. A decrease in the reformation feed rate directly leads to an increase in the hydrogen-to-hydrocarbon ratio and a decrease in the space velocity. These factors are the fundamental reasons for the decrease in the catalyst fouling rate; when the fouling rate is significantly lower than the coking rate, it affects the stable operation of regeneration and coking. Therefore, it is not a change in the function of the metal that suppresses catalyst coking. 2. When the reforming feed rate is reduced, the space velocity decreases, which leads to an increase in hydrogen yield (increased reaction depth), but the purity of the recycled hydrogen decreases (due to increased cracking reactions); therefore, a decrease in the reforming feed rate does not result in an increase in the purity of the recycled hydrogen. 3. The metallic and acidic functions depend on the water-chlorine balance of the catalyst, and have little to do with the amount of reforming feedstock. I also have experience with CCR units using the Axens process; any criticism or suggestions are welcome.

This unit is a UOP continuous reformer; after the reduction in reforming volume, the most noticeable effect is a decrease in hydrogen production. As a result, the inlet flow rates at the first and second stages of the hydrogen pressurization unit in the recontact section decrease. To prevent compressor surge, it is necessary to adjust the opening degrees of stage 1, return 1, and stage 2, return 2. Stage 1, return 1 refers to the inlet of stage 1, that is, the outlet of the recycle hydrogen compressor. The outlet of the recycle hydrogen compressor has two streams: one stream of recycle hydrogen goes to the reactor, while the other stream of hydrogen is used for recontact. When the opening of stage 1, return 1 is increased, some of the hydrogen goes into the recycle hydrogen stream, rather than all of it going to the inlet of stage 1. This leads to an increase in the amount of recycle hydrogen and also an increase in the hydrogen-to-oil ratio. However, the pressure of the recycled hydrogen will drop. Generally, the pressure in the reactor rises and falls in sync with the pressure of the recycled hydrogen. The decrease in reactor pressure is also due to a reduction in flow rate; in order to ensure smooth flow of the catalyst, a pressure difference is maintained between the regenerator and the reduction chamber, with the pressure in the reduction chamber being slightly higher than that in the reactor. Thus, the pressure in the regenerator drops in sync with the pressure in the reactor. This approach helps to maintain a stable pressure difference between the regenerator and the reduction chamber, thereby ensuring proper flow of the catalyst. If the pressure in the regenerator fluctuates greatly, it may trigger relevant interlocks and lead to a shutdown of the regeneration process; however, this is unlikely to happen. Generally, reducing the oxygen content associated with coking is sufficient, and there is no need to change the circulation rate! Criticism and suggestions are welcome

A too rapid decrease in feed flow can cause fluctuations in high pressure; then check the relationship between the nitrogen seal tank, the lockhopper, and high pressure.