How to adjust tail combustion

Generally, an oxidizer is added. If the oxygen content is a bit low, the main air flow rate can be increased slightly. If the replacement or addition of substances is done too quickly, causing the unreacted material to be carried along, the speed should be reduced or the process should be stopped temporarily!

How can it be adjusted through the process? without an oxidizer

This post was last edited by Green Lotus on 2019-10-26 at 19:43. The simplest way is to slightly adjust the feed rate.

Reducing the main air flow should result in a lower coking intensity of the dense-phase bed, right?

Tail combustion is essentially the result of excess CO flowing into the dilute phase where it reacts with air, releasing heat and thereby raising the temperature of that dilute phase. At the same time, the decrease in the concentration of C in the dense phase leads to a drop in the temperature of that dense phase; this is the fundamental reason for tail combustion to occur. The specific procedure involves making adjustments based on the operational instructions; the principle behind this is the maintenance of three types of balance. Common factors that affect coking include an increase in the amount of coke formed, a sudden increase in the main air flow, a decrease in the temperature of the coking tank, excessive heat absorption by the two-phase region, and faults in the main air distribution pipes, which lead to uneven airflow and thus affect the intensity of coking.

Tail combustion means an excess of oxygen; reducing the main air flow is the fastest solution, followed by adjusting the processing volume

Personal opinion: In the oxygen-enriched regeneration process, the amount of air used for combustion is sufficient; adjustments can be made to increase the temperature of the regeneration bed (thereby enhancing coking, without increasing the processing volume – the bed temperature can be raised by adjusting the steam generation load). Reducing the amount of coke formed (by lowering the processing volume or reprocessing the oil slurry) can also help, as can improving the efficiency of the gases produced in order to reduce the coking load on the regenerator.

How was the slight increase in quantity determined? Won’t the amount of char produced increase, and won’t the charring effect become worse?

Is this SeaUser’s suggestion to increase the bed temperature in order to boost the burning intensity? I’ve tried making such adjustments as well, but with little effect; it’s still a real headache at the moment, as sometimes there’s no theoretical basis to support it