Coking preheating oil stripping
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When draining oil from delayed coking, how should a centrifugal pump be operated? The oil is first sent to the vent tower and then to the fractionation tower, with reciprocating pumps being used throughout. Try using a centrifugal pump, but no flow is achieved.
Centrifugal pumps are used for media with low viscosity; heating the oil may improve the situation
Try the screw pump; to prevent pressure buildup, an adjustable valve with a return oil tank is designed at the pump outlet. If the liquid level in the oil rejection tank is high, reduce the flow rate by closing the control valve; more oil goes to the fractionation tower (No. 2) ； When the liquid level is low, open the control valve to allow oil to return to the tank and thus raise the liquid level. From now on, say goodbye to reciprocating pumps; once used, there’s no going back. :victory:
Actually, I think it’s good to use a reciprocating pump for oil displacement. A large amount of oil displacement affects the temperature at the bottom of the fractionation tower; the reciprocating pump manages to maintain the outlet pressure while allowing only a small amount of oil to be displaced, and it’s less likely to cause vacuum conditions. On the other hand, centrifugal pumps tend to create vacuum conditions, and when only a small amount of oil is displaced, they require prolonged pressure buildup, which can damage the equipment. Even with variable-frequency pumps, pressure still suffers to some extent! Personal opinions are for reference only!
With a centrifugal pump, it’s easy to experience vacuum conditions once the temperature rises later on; now we have replaced the reciprocating pump with a screw pump
We use variable-frequency centrifugal pumps, which is fine
What is the residual carbon value of your delayed coking feed? ?
What is the sulfur content of the petroleum coke produced by your delayed coking process? ? Where does petroleum coke go? ?
What is the residual carbon value of the feed for your delayed coking? ? What is the sulfur content in petroleum coke? ?