Fractionator level

Reason: There are too many light components in the raw materials, and the reflux was not adjusted； Treatment: Reduce the backflow volume and increase the discharge of light components.

As the pressure in the distillation tower increases, and at constant temperature, the volatility of the various components in the oil decreases, causing the liquid level at the bottom of the tower to rise.

Hehe, there are many reasons for this; you’ve only mentioned one of them. For more details, please refer to the Technical Q&A on atmospheric and vacuum distillation units

It is usually caused by the too light nature of the oil; when its volatility is too low, the lighter components cannot rise to the surface, causing the liquid level to increase

Posted by kangmingyan0 on 2007-6-23 13:29. The main purpose of the distillation tower is to remove hydrogen sulfide from the oil produced as a result of reactions, thereby ensuring that products such as naphtha and aviation fuel meet corrosion standards. It also helps to reduce the corrosion caused by hydrogen sulfide on the equipment in the distillation system. Additionally, the stripping tower is used to separate liquefied petroleum gas from the reaction products. The above also constitutes the most fundamental starting point and basis for the operational adjustment of this tower. Pressure is a qualitative parameter of a product; it determines the boiling point of the oil. Under the same temperature and composition conditions, it influences the vaporization rate of the oil, having a direct impact on the operation of the entire tower. As the tower pressure increases, the boiling point of the oil rises, the vaporization rate decreases, the amount of gas phase in the tower diminishes, and it becomes more difficult to separate the various components. To maintain effective separation, more heat is required, resulting in higher energy consumption. Higher pressure means a higher partial pressure of the oil vapor; less vaporization occurs, so the liquid level rises~~~

High pressure, which leads to an increase in the vapor pressure of hydrocarbons, is the main reason for the rise in liquid level

Is it because the opening degree of the reboiler steam valve responds slowly, and there are fluctuations in the feed rate (an increase), resulting in insufficient timely adjustment?

Regardless of how the properties of the oil change, the liquid level will definitely rise as pressure increases. To keep the temperature constant, it is necessary to examine the product quality in order to determine whether the properties of the raw material have changed

Control of the liquid level at the bottom of the distillation tower: http://bbs.hcbbs.com/viewthread.php?tid=283618 Issues related to the liquid level of the oil slurry at the bottom of the distillation tower: http://bbs.hcbbs.com/viewthread.php?tid=379019

Personally, I think siblings could do some searching before asking questions, to see if anyone has already asked the same or similar questions. To avoid repeated questions.

As pressure increases, the boiling points of the various components in the oil rise, resulting in more liquid-phase components, and thus the liquid level at the bottom of the tower increases.