Is a pre-lift nozzle of the showerhead type used?
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This post was last edited by fengdingwen on 2010-9-12 at 23:26. Is there any fellow sailor who uses a showerhead-type pre-lift nozzle? We are currently using a steam ring in our device, and the results are excellent. What are the advantages of a showerhead type? The nozzles we used previously in the C4 stream to feed into the riser for reprocessing were showerhead-type nozzles, which proved to be problematic as they occupied a large portion of the flow cross-section in the riser section. Another question: What is the typical density of the pre-lift section using such nozzles? Is it dilute-phase transport?
This post was last edited by doing168 on 2010-3-6 at 20:04. The steam ring is generally used for loosening purposes; its height at the Y-shaped section of the lift pipe is different from that of the shower head. The shower head is placed at a higher height, roughly at the same level as the intersection line of the lift pipe and the regeneration inclined tubes, so as not to create significant resistance to the catalyst flowing down along the regeneration inclined tubes.
Our previous small units used showerheads, but those would get worn out frequently and had to be replaced every time they needed maintenance. The new larger units use straight pipes, and the purification effect is also good
We are in the same situation as the 3rd floor.
Agree with the opinion from the 3rd floor. We used shower nozzles before as well, and they would get worn out every time; later we switched to straight-nozzle ones, and the results were quite good.
We are still using the pre-lift nozzle on our showerheads to this day. As the sailors mentioned above, there is significant wear and tear, and the wear-resistant materials tend to fall off; they need to be replaced after each cycle, but it seems that everyone has already gotten used to it.
Reply to 2# doing168: “It is roughly at the same elevation as the intersection line of the lift pipe and the regeneration inclined tube, so it does not create significant resistance to the catalyst flowing down along the regeneration inclined tube.” " Could it have an impact on the flow area of the riser? Thank you!
The steam ring is generally used for loosening purposes. The heights of the steam ring and the shower head at the Y-section of the lift pipe are different, so it does not create significant resistance to the catalyst flowing down from the regeneration inclined tubes.
I agree with what the original poster said: in wax oil catalysis, a showerhead-type pre-raising mechanism is mostly used. In the pre-raising stage, the flow is definitely in a dense phase, with a density of generally 200–400 g/cm3; it only becomes a dilute phase once it enters the lift pipe. Both the showerhead and the top of the straight pipe suffer wear and require maintenance and repair.
We used rings on the outside of the pre-lift distributor, and it worked very well. The density is approximately 300-500.