How to control and stabilize the material level of catalytic cracking?

Why doesn't anyone answer this question? Is there no master in Haichuan?

Our device is a high-low parallel two-stage regeneration catalytic cracking unit with an external heat collector. There are many factors that affect the stable control of the catalytic secondary regeneration material level. 1. The size of the main air volume of the secondary regenerator 2. The pressure fluctuation of the regenerator 3. The opening of the circulation slide valve 4. The opening of the external heat slide valve 5. The opening of the regeneration and standby slide valves is normal. When the pressure of the two devices is stable, the main air volume of the second regeneration, and the opening of the external heat slide valve are certain, use the circulation slide valve opening to control the secondary material level.

The stable control of the secondary material level is easy. Normally, when the pressure of the two devices is stable, the main air volume of the secondary system does not need to be too large, just enough for fluidization, the air volume of the burning tank is stable, and the opening of the external heat slide valve is certain, the circulation slide valve opening is used to control the secondary material level. But sometimes the regeneration temperature is not necessarily stable, so the circulation slide valve is automatically controlled or the valve is manually controlled to a certain position and does not move in the case of equipment. The regeneration slide valve is automatically controlled and can be adjusted by the external heat slide valve.

The host is worried! Okay, let’s all talk. When the external heat collector is not used or when a large amount of heat is not taken temporarily, the external heat slide valve maintains a fixed value at this time, and the secondary dense phase storage volume and the circulation slide valve are automatically controlled to control the material level. This is to set the PID well, and do not let the material level fluctuate greatly. At this time, as long as the amount and properties of the raw materials do not change much, the regeneration temperature should be self-stable. As the processing capacity increases or the properties become heavier and a large amount of heat is required, increase the external heat fluidization air volume to an empirical value, that is, a good external heat fluidization state is achieved, and then slowly open the sliding valve to control the regenerator temperature or the charring tank temperature stably. But I suggest that the sliding valve should not be automatically controlled with the temperature control, because the temperature of the coking tank is generally relatively stable, and there is no need to automatically add a factor that affects the fluctuation of the secondary material level, because the stability of the secondary dense bed has such an important impact on the catalyst loss!

1. Check whether the loose wind in the regeneration inclined pipe, the circulating inclined pipe, and the external upper inclined pipe is too large. If it is too large, it will easily cause the inclined pipe to not fluidize smoothly, generate bubbles, and make it difficult to control the secondary material level. 2. When adjusting the circulation slide valve and the external upper slide valve, they should be adjusted together to avoid opening and closing at the same time. 3. Check whether the loose air regulating valve of the second density is malfunctioning, and whether the air volume is suddenly large or small, which affects the secondary material level.