The atmospheric pressure bottom oil passes through a pump, then through a heating furnace, and subsequently enters the vacuum distillation column; where does the pressure decrease?
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I would like to ask the experts in vacuum distillation for some advice. For example, I’m looking at the PFD of a reference project: the outlet pressure of the bottom pump in the atmospheric tower is 1.6 MPaG. After passing through the heat exchange network, the pressure entering the vacuum furnace is 0.7 MPaG – this part is fine; it represents the normal pressure drops across various equipment. After leaving the vacuum furnace, the pressure becomes 80 kPaA, and after passing through the oil transfer line, it becomes 10 kPaA. I have two questions: (1) Does this mean that the maximum allowable pressure drop in the oil transfer line is 70 kPa? (2) The pressure is 0.7 MPaG when it enters the vacuum furnace, but it drops to 80 kPaA after exiting – where does such a large pressure drop occur? I appreciate any guidance from the experts. O(∩_∩)O Thank you
From my experience, it has nothing to do with vacuum distillation; the greatest pressure drop usually occurs at a flow-limiting valve, which can be a manual valve or a control valve.
This post was last edited by longkui1990 on 2016-4-28 at 19:03. There is a control valve between the pump and the pressure-reducing furnace; certainly none exists between the pressure-reducing furnace and the pressure-reducing tower. The reference values indicate that the pressure entering the furnace is 0.7 MPaG, but it drops to 80 kPaA upon exiting the furnace. This is something that’s really hard to understand
As the oil is heated, it vaporizes; as the temperature of the oil rises, its volume increases, and therefore the pressure drop inside the heating furnace should also be significant.
It can’t be that heavy, right? It’s already 7 kilograms. .
I don’t know where the inlet of the pressure reduction tower is Is there no height for the rising liquid column?
What is the typical pressure at the outlet of a vacuum furnace?
The key to the losses in pipeline heat exchangers lies in the regulation by the inlet control valve
I don’t see any control valves on the PID between the pump outlet and the heating furnace. .
The pressure drop, also known as the pressure difference, refers to the pressure level at which operations take place in the atmospheric tower; as the pressure increases, the pressure loss occurs due to the expansion in diameter within the tower