The problem of coking in the settler

Add scale inhibitors and control the bottom liquid phase temperature at an appropriate level

This has nothing to do with coking in the settler

Many technologies are now used to reduce coking, but coking still occurs inevitably

This post was last edited by wang*900128 on 2016-12-15 at 15:48. I just checked some information; there are several main factors that cause coking: 1. High density of the raw material, low oil-to-agent ratio, low mixing temperature with the regenerating agent, and insufficient contact, which prevents complete vaporization – as a result, a considerable amount of the raw material remains in liquid form； 2. A low preheating temperature of the raw materials, low efficiency of the atomization nozzles, insufficient amount of atomization steam, and improper installation of the nozzles lead to uneven feed distribution and poor atomization effects, resulting in coking on the nozzles and the inner walls of the lift pipe ； 3. The temperatures on the inner surfaces of the equipment in the reactive sedimentation system and on the inner walls of the oil and gas pipelines are low, below the dew point temperature of the oil and gas, which leads to the aggregation and coking of the oil and gas. 4. The rapid separation design of the settler is inadequate; oil and gas stay in the settler for too long, resulting in secondary cracking, which causes extensive coking in various parts of the settler system, including the coarse spin section, top spin section, inner walls, internal components, top portion, and gas collection chamber

This post was last edited by wang*900128 on 2016-12-15 at 15:57. Anti-shock measures: 1. Optimize the structural design of the pre-lift section of the lift pipe, and use an appropriate distributor to ensure that the catalyst in this section has sufficient heat capacity and density. 2. Ensure that the length of the pre-lift section is 5–8 M, or that the linear velocity in this section is maintained at 3–6 m/s, with a density of 240–380 kg/m3. 3. Improve the design of the feed section of the lift column to reduce catalyst backmixing in this section; the linear velocity at the outlet of the lift column should be kept around 15–23 m/s. 4. Use efficient rapid separation devices at the outlet of the lift column; if possible, VQS rapid separation devices can be employed. 5. Utilize high-efficiency atomization nozzles. 6. Properly adjust the anti-coking steam supply in the settler to reduce the vapor pressure of oil and gas, lower the dew point of heavier components, and minimize condensation and coking

Is there any coking on the material legs?

In fact, the most important thing is to ensure stable operation and reduce fluctuations; this involves long-term operation of the smoke extractor and external systems, while avoiding feed interruptions and the need to stop oil slurry recycling.

Existing technology is inevitable; it can only be slowed down.