Strange problems that occur in atmospheric and vacuum distillation processes
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During normal operation, after the EDI pressure control bypass valve was opened, the pressure in the EDI tank dropped by 1 kilogram; there was less gasoline produced, and the temperature at the top of the tower was higher than before. What’s the reason?
This post was last edited by mpcchuang on 2015-6-10 08:59. If you can notice such subtle changes, and keep delving into them, you will become one of the top experts in the country. Opening the voltage-controlled bypass valve for electrodesalination causes some water to vaporize and enter the primary distillation tower. The resulting pressure drop leads to earlier vaporization and cracking of light components, thereby increasing the amount of water vapor and gas in the tower. This occupies space at the top of the tower, preventing gasoline that could volatilize there from reaching the surface. Due to the large volume of water vapor and gas, a significant amount of heat is carried away, causing the temperature at the top of the tower to rise. This situation is similar to that caused by water in crude oil, only less severe; moreover, the low pressure in the crude oil system makes it unsuitable for optimized operation
I’m not sure what exactly you mean by the voltage-controlled bypass line – does it refer to the desalination line or the differential pressure control valve for desalination? When the desalination bypass line is activated, some of the water that has not undergone desalination ends up flowing into the subsequent system. Since the raw material contains a high amount of water, this leads to an increase in the pressure drop in the subsequent system, as well as an increase in the desalination pressure. This results in more water needing to be removed from the top of the initial distillation tower, thereby increasing the yield of gasoline from that stage and raising its pressure. If it’s the differential pressure control valve that is used for the bypass line, then the mixing of oil and water becomes less intense, which improves the efficiency of water removal during desalination. This leads to a decrease in the pressure drop in the subsequent system, a reduction in the desalination pressure, less water needing to be removed from the top of the initial distillation tower, and a decrease in its pressure as well.
They were asking why there was less gasoline in the tank, and you didn’t even answer the question correctly
What does the OP mean by voltage-controlled subline? Is it the time-based electrodesalination bypass line?
There is a pressure control valve on the outlet line of our electrodialysis tank, used to regulate the pressure in the tank