How to reduce olefins
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Reactor modification: Reactor 1 and Reactor 2; reaction temperature 506–510; valve opening for Reactor 2 at 35–45; olefin level remains high at 40–42.6; significant coking occurs. At the same time, the flow in the raw slant tube is not good. How to operate it?
If the flow in the raw slant tube is not good, check the loosening steam; it may also be related to the large amount of raw coke produced. Increase the stripping steam and give it a try. Also, the opening degree of your second counter-sliding valve is too high; here, even a setting of 16% results in a noticeable increase in coke formation. You should reduce the opening degree of your second counter-sliding valve accordingly. What is the temperature of your regenerated catalyst?
I also think that the opening degree of your secondary reverse slide valve is too high; ours is at most 11%. I also want to ask: What process do you use? Is it MIP?
How effective is the balancing agent? Poor activity of the balancing agent can lead to reduced selectivity in the reaction and an increase in thermal cracking; measures such as increasing the supply of fresh material should be taken ； At the same time, pay attention to changes in the heavy metal content in the raw materials.
An excessive opening of the slide valve increases the activity per unit of catalyst, enhances the degree of reaction cracking, and raises the yields of coke and dry gas. The spool opening should be reduced, or the reaction temperature should be lowered slightly.