Have you ever encountered scorched pellets?

Causes of projectile scorch: (1) Heavy metal content in the raw material properties, asphaltene content in the raw material, reaction temperature, and coke tower empty column linear velocity. (2) Circulation ratio and coke tower pressure. The formation of pellet coke will lead to poor water discharge. In severe cases, it will block the water discharge pipeline, causing the coke tower to be unable to discharge water, and safety accidents may easily occur during the treatment process. The main factors for the generation of pellet coke are the properties and composition of the raw materials. The formation of pellet coke can be suppressed by adopting lower reaction temperature, higher reaction pressure, lower circulation ratio, and appropriately separating part of the light fractions in the coking fractionation tower before going to the coke tower. Through exploration, the device operating parameters were determined as: The gas velocity in the coke tower is less than 0.15 m/s, the reaction temperature is 498-502°C, the reaction pressure is 0.17-0.25 MPa, the circulation ratio is 0.5-0.6, and the bottom temperature of the fractionation tower is 355-365°C. Six months of continuous operation results show that the above process improvements effectively avoid the formation of pellet coke. Solution: (1) Optimize raw materials to solve the pellet coke problem (2) Optimize operating conditions to solve the pellet coke problem (3) Reducing the circulation ratio or increasing the coke tower pressure is helpful to solve the pellet coke problem. (4) Controlling the appropriate amount of pellet coke in the coke will help the device improve its economic benefits. Look at the picture of the projectile focus: http://bbs.hcbbs.com/viewthread.php?tid=386841

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