I would like to ask everyone: why doesn’t air get carried in when the catalyst in the catalytic cracking regenerator enters the riser through the slide valve?
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Why doesn’t the regenerator catalyst bring in air when it enters the riser through the inclined-tube single-acting slide valve?
I’m a beginner in catalytic cracking, and I’m a bit confused
Inside the inclined tube, there is a dense-phase flow that creates a material seal, so air cannot pass through
First of all, let me tell you that it’s not that there is no air, but rather that its amount is relatively low. The air that enters the inclined tube, in its gas-solid state, returns to the regenerator along with the gas flow; only a small portion of it goes into the lift column along with the catalyst!
The light oil regeneration slide valve in the catalytic cracking light oil riser cannot be closed properly; how can the flow in the two reactors be stopped during shutdown?
The valve cannot be fully closed; you can control the differential pressure between the two devices to prevent cross-contamination!
Air will be introduced, approximately 1-2 cubic meters per ton of catalyst.
This has already been done; what I’m asking is how to stop the work! It can’t be shut off now
1. Gases have a tendency to flow upward, resulting in less amount entering the inclined tube. 2. The valve does not close properly; strict control is required over the differential pressure between the two vessels.
We have stopped work for maintenance!