Coke tower preheating
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The processing volume in delayed coking is very high, but why can’t the coke drum be preheated? Some people have analyzed that coking can occur in the preheating valve and preheating wire – is it possible with oil?
Are there pressure measurement points before and after the preheating valve or preheating line, or a vent valve? Use two pressure gauges to measure the pressure drop.
No, there is only a pressure gauge on the top of the oil skid tank, and then there’s one at the top of the distillation tower. What is the pressure difference between the fractionation tower and the coke tower in your facility? Here, it’s 0.03 Mpa
Processes that are different cannot be compared. It is recommended to send the flowchart for a look. Personally, I think the judgment regarding pipeline coking is reasonable.
It is possible to determine whether coking has occurred at the elbow at the outlet of the coke tower (the point where quench oil is injected) by examining the pressure drop in the coke tower during preheating. If necessary, the elbow jumper can be opened according to the Chetta cycle to confirm cleaning. If there have been no other abnormal operations of the device, there is a high possibility of coking in this area.