Temperature drop before and after the feed oil nozzle in the riser
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What is the temperature drop before and after the feed oil nozzle in the riser of a catalytic cracking unit? The temperature drop is much lower than before; what is the reason for this?
What was the temperature drop before, and what is it now? The preheating temperature of the crude oil, the regeneration temperature, etc., all have a certain impact
Do you have catalyst coolers? What is the temperature of the catalyst as it enters the lift pipe? Is the medium used for pre-lifting steam or dry gas? If it’s steam, has there been any change in temperature?
Without catalyst cooling, the temperature of the catalyst entering the lift pipe remains almost unchanged. Dry gas is used for pre-lifting.
Previously the temperature drop was 80°C, while now it’s only 50°C; other parameters have not changed much
Have the other operating parameters not changed? Could the thermocouple fail?
This is not a good sign; pay attention to the product distribution, especially the coke yield and the regenerator bed temperature. If there are no changes, it could be a problem with the temperature sensors. Have there been any changes in your processing volume, or in the composition of the raw materials?