Heavy crude oil is processed in atmospheric-pressure units; what changes occur in the load of the heating furnace when the processing volume remains constant? Solve
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Heavy crude oil is processed in atmospheric-pressure units; what changes occur in the load of the heating furnace when the processing volume remains constant? A The load on the atmospheric pressure furnace increases, while the load on the reduced pressure furnace decreases. B The load on the atmospheric pressure furnace decreases, while the load on the reduced pressure furnace increases. C The load on both the atmospheric pressure furnace and the reduced pressure furnace decreases. D The load on both the atmospheric pressure furnace and the reduced pressure furnace increases. Please choose and explain the reason.
I choose B; since it is heavy oil, the load on the vacuum distillation furnace increases relatively.
B. Due to the lower yield of heavy oil, the feed volume to the vacuum furnace increases, resulting in a higher load on the vacuum furnace ； The large volume of vacuum residue leads to an increase in the temperature of the feed after it has been changed; with the processing capacity remaining unchanged and the feed rate to the atmospheric furnace staying constant, the increase in feed temperature results in a lower load on the atmospheric furnace.
Thank you for your reply. Let’s discuss this: since it is a heavy oil, when the processing volume remains unchanged, fewer components are distilled in the initial distillation tower; nevertheless, the feed to the atmospheric furnace still increases
D: With unchanged processing volume, less heating is required for the light components, but the load on the furnace increases
It then comes down to determining which is greater: the increase in load q1 caused by the slight increase in pressure in the atmospheric-pressure furnace, or the decrease in thermal load q2 resulting from the rise in the temperature of the raw materials after the exchange. Based on my production experience, I feel that the load on the atmospheric pressure furnace has decreased.
Thank you, because we have no pressure relief and no experience.
For the same processing volume, when processing light crude oil, the load on the atmospheric pressure furnace is higher than that when processing heavy crude oil, while the load on the reduced pressure furnace is lower.
When the furnace temperature requirement remains unchanged, it depends on which distillation range the so-called heavy crude oil falls within.
As the oil becomes heavier, less vaporization occurs, resulting in less heat absorption. In a furnace operating at atmospheric pressure, if the load decreases, the amount of oil fed into the vacuum distillation unit increases, thereby increasing the load on that unit. Feeling