Is the main air flow rate in a catalytic regenerator generally constant?

The main air flow is generally adjusted appropriately according to the amount of coke produced to meet the coking requirements; with stable raw materials, coking will be consistent. So, the main air volume is basically not adjusted.

The temperature difference between day and night as well as air humidity also affect the amount of dry air that actually enters the regenerator. Coupled with the changes in the flow rate of the feed oil caused by this temperature difference, it is necessary to adjust the feed volume if the main air flow is not adjusted, in order to achieve balance

The amount of main air flow is primarily determined by the oxygen content measured through smoke sampling and analysis. If there are two regenerators, the first one is usually used for oxygen-deficient regeneration, with an oxygen content of less than 1%; the second one is used for oxygen-enriched regeneration, where the oxygen content is kept between 3% and 5%. If this level is too high, some of the main air flow is reduced, while if it is too low, the main air flow needs to be increased in order to ensure effective burning of the regenerant； Furthermore, the main air volume is adjusted based on the catalyst carbon content data obtained from sampling and analyzing the regenerant; if the carbon content is too high, it is necessary to increase the main air volume. Generally, it is appropriate for the carbon content determined by the regenerant to be no more than 0.15%.

The main functions of the primary wind: 1. Increase fluidization power. 2. Increase the charring conditions. The charring of the general equipment and the catalyst inventory remain basically stable within a certain range, so the main air flow requires little adjustment. Adjustments are made only when the function of appeal cannot be fulfilled.

The device I’m using is generally not adjusted much, but due to the temperature difference between day and night, it is adjusted slightly every evening and morning.

If the device were fully regenerative, no adjustments would be necessary. Our device is not fully regenerative; in order to maintain the proper burning effect in the regenerator as well as the appropriate flue gas temperature, we generally make slight adjustments to the main air flow rate

We have two sets of catalytic units; I am working with the one that is fully regenerated, and the main air flow is adjusted very rarely

An important characteristic of catalytic cracking is its self-balancing process. It can be assumed that as the feedstock becomes heavier, more coke is produced; this leads to an increase in the carbon content of the regenerated catalyst, which in turn reduces the catalyst’s activity and results in less coke formation during the reaction. The system then reaches equilibrium again. From this perspective, it is easy to understand why the catalytic air flow does not need to be adjusted in order to maintain stability in the system over a long period of time.

For this product, it’s necessary to determine whether the nature of the crude oil is light or heavy Should the main air flow also be adjusted depending on the amount of char formation?

For complete regeneration, as long as the oxygen content in the flue gas is within the normal range, there is no need to adjust the main air flow; this flow does change throughout the day, and minor adjustments can be made if energy savings are desired. For partial regeneration, attention must be paid to the regeneration effect and the dilute phase to prevent backburning; the main air flow needs to be adjusted or vented.