How to avoid pellet coking in the coking production process
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This post was last edited by lijianhuai on 2011-8-8 10:12. Dear coking experts, is shaking in the coke tower production a sign of the formation of pellet coke? How to avoid pellet coke in the coking production process? What should be done after bullet char is formed? Awaiting guidance!
This post was last edited and replied to by lijianhuai on 2011-8-8 10:11. Reply 1# Good intentions, but please search the forum – there are many posts of this kind. 1. Causes and countermeasures for the formation of pellet coking in delayed coking: http://bbs.hcbbs.com/viewthread.php?tid=299566&highlight=%B5%AF%CD%E8%BD%B9 2. Formation of pellet coking: http://bbs.hcbbs.com/viewthread.php?tid=176440&highlight=%B5%AF%CD%E8%BD%B9 3. Coking pellet coking: http://bbs.hcbbs.com/viewthread.php?tid=175488&highlight=%B5%AF%CD%E8%BD%B9
According to foreign reports and domestic experience: if the API of the raw material is less than 7 and the residue/asphaltene content of the raw material is less than 1.4–1.6, pellet coking will occur; pellet coking does not occur when the API is greater than 10 and the residue/asphaltene content is greater than 2.0. In addition, factors such as the metal content in the raw material, operating temperature, recycle ratio, and gas velocity in the empty tower also have an impact on the occurrence of pellet coking. Therefore, during design and production, efforts should be made to avoid the formation of pellet coke in order to ensure the long-term safe operation of the device.