Coking quench oil
Thread Content
In previous posts, someone mentioned that catalytic slurry can be used as quench oil at the top of the carbonization unit’s carbon tower. So, can catalytic slurry and the sludge generated from water supply and drainage be used as quench oil in coking processes? Has any plant used them?
Using these two materials as quench oil can easily lead to coking in the large oil and gas lines, so their use is advised with caution. Catalytic slurry can be blended into vacuum residue, and the slag can be recycled during coke cooling in the coke tower; both of these technologies are well-established, so there should be no major issues.
Is there any factory in China that uses this technology? We could go and take a look
What about blending catalytic slurry into vacuum residue? Are there any existing facilities for that?
Generally, quench oil is mid-range oil and diesel, right? The middle-stage oil seems better!
In my opinion, it’s better to reprocess the slag while adding steam; it’s not advisable to do so in quench oil. Severe water content can have a significant impact on distillation, and there is also the issue of coking in the vapor line mentioned by someone above. Refining at the bottom of the tower should be carried out when the water supply is low, but this approach is not ideal either; it can easily lead to blockages in the coke pores, affecting both the cold coke and the water discharged. Moreover, the temperature of the coke layer is relatively lower when the water supply is low compared to when steam is supplied, which hinders degradation and can cause contamination of the cold coke water. Most companies have used catalytic slurry in blending operations, and an optimal blending ratio does offer certain benefits in terms of coking prevention, as it can help avoid the formation of pellet coke.
Catalytic slurry can be used as quench oil at the top of the carbonization unit’s carbon tower; it’s definitely not an option for joking purposes. It can be mixed into the feedstock, but care must be taken to control the catalyst content. The scum used for water supply and drainage can be used as quench oil in coking, but the water content must be controlled; if it is high, it is better to reprocess it during steam or water supply, rather than using it as quench oil.
Catalytic slurry and scum cannot be used as coking quench oil; it shouldn’t work
Catalytic slurry cannot be used as extremely cold oil; my workshop had to shut down due to severe coking at the bottom of the splitter tower as a result of using it as quench oil. It is okay to mix in slag, after a strong blowing process.