Advantages and disadvantages of reprocessed oil slurry in delayed coking units
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This post was last edited by JumpingWind001 on 2018-6-20 at 21:14. As the title suggests: 1. Currently, is there a lot of recycle slurry in the delayed coking unit? What processes are used to get them into the device? 2. What should the blending ratio be? What is the solid content? Is equipment needed to handle catalyst particles? 3. What changes have occurred in product distribution? 4. Impact on the equipment, such as catalyst wear and the coking rate of the heating furnace. 5. Other unfavorable circumstances. 6. Impact on long-term operation. First, I would like to thank all the masters for their generosity and strong support:handshake:handshake:handshake.
Lanzhou Petrochemical has adopted our company’s slurry de-ashing technology to treat the slurry before sending it to the coking process; after de-ashing, the ash content in the slurry is below 800 ppm, and the blending ratio is over 15%. I’m not very familiar with other details, so you can go to Lanzhou Petrochemical for more information.
My unit is now reprocessing catalytic slurry; after the slurry is clarified, it is mixed with vacuum residue before entering the buffer tank. At present, it has little impact on the product distribution, with a slight increase in coke ash content. For long cycles, wall thickness monitoring is required for the feed pipelines, especially at the elbows ； Pay attention to changes in the wall temperature of the radiant furnace tubes, and keep the wall temperature within the specified operational range ； In the event of an abnormality in the device, cut off the recycle of catalytic slurry.
The charging ratio should be between 5-10%; exceeding 10% will cause severe wear on the plant’s pipelines.
Actually, the issue of whether to reprocess oil slurry in coking has been discussed for a long time; it mainly comes down to the relationship between processing costs and product value! So sometimes it’s more cost-effective to just buy it as marine fuel!
May I ask how your company clarifies the slurry?