Catalytic cracking riser outlet temperature
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Recently, in our catalytic unit, the temperature from the riser pipe to the oil and gas pipeline rose instead of falling. I don’t know why!
The outlet temperature of the riser pipe in our factory is about 509 degrees
It may be due to cracking, or it may be a problem with the thermocouple.
There is a problem with the thermocouple, or a secondary reaction occurs.
I agree with the original poster. Either there is a problem with the thermocouple, or the two reactions occur. Generally, the probability of a problem with the thermocouple is greater. It should be judged from the entering temperature of the fractionation tower or the entire heat balance.
The original tube temperature of my installation was controlled at 530°. Now, because the liquid yield has been increased and the gas yield has been reduced, the tube temperature has dropped to 514°. Since the start of construction, the phenomenon mentioned by the poster has not occurred. I think it is what everyone above said, either the thermocouple failed or a secondary reaction occurred.
The cause of the thermocouple or secondary reaction.
It should not be a secondary cracking reaction. Cracking requires the help of external energy to destroy the bond energy, rather than releasing heat. The poster should look for the reasons for changes in various parameters such as product distribution and catalysts. Thermocouple problems are not ruled out, but it depends on how many thermocouple problems there are. It is impossible for them to go wrong at the same time.
Our reaction temperature is 520 degrees. I wonder whether you are talking about the temperature of the gas collecting chamber or the temperature of the fractionation tower! ! I think this situation should be a problem with the thermocouple. I suggest you check other temperature points and compare them with the previous parameters! !
If there is no change in fractionation system temperature and product distribution, the problem is with the thermocouple. If there are changes in the fractionation system, it may be a secondary reaction. The cracking reaction in the catalytic reaction is endothermic, while reactions such as hydrogen transfer and isomerization are exothermic reactions, so the phenomenon mentioned by the poster may also occur.