What are the factors that affect changes in the bottom liquid level?

Thread Content

What are the factors that affect changes in the bottom liquid level? Read this chapter in the novel reader – go and read it; immerse yourself in reading within the novel reader. During the refining process, maintaining a stable liquid level at the bottom of the initial distillation tower is crucial for the smooth operation of the entire process. The initial distillation tower has a small diameter and a high flow rate per unit volume; even slight fluctuations in the crude oil flow can cause changes in the liquid level at the bottom of the tower. The following are the specific reasons for changes in the liquid level at the bottom of the initial distillation tower: 1. Flow rate factors: 1. Changes in feed and extraction flow rates: Variations in the feed flow rate to the initial distillation tower and the flow rate extracted by the pump at the bottom of the tower directly affect the liquid level. When adjusting the processing capacity or regulating the bottom liquid level of the initial distillation tower, if the inflow and outflow rates to and from the tower are not properly balanced, it will lead to fluctuations in the liquid level. For example, if the flow rate into the tower is high while the flow rate out of the tower is low, the liquid level will rise ； Conversely, the liquid level will drop. 2. Improper operation adjustment: In actual operation, if the operators fail to adjust the feed and withdrawal flow rates in a timely or accurate manner, it can also lead to unstable liquid levels. For example, when adjusting the load of the device, failing to adjust the corresponding flow rate in a timely manner may cause the liquid level to deviate from the normal range. II. Crude oil property factors: Changes in the properties of crude oil can cause fluctuations in the bottom liquid level of the tower. As the crude oil becomes heavier, it becomes more difficult to vaporize; as a result, more oil remains unvaporized inside the tower, and this increases the liquid level at the bottom of the tower ； When the crude oil becomes lighter, its vaporization rate increases relatively, and the liquid level at the bottom of the tower decreases. For example, the properties of crude oil vary depending on its source; when switching between different types of crude oil, failure to adjust the operating parameters in a timely manner can cause changes in the liquid level at the bottom of the tower. III. Feed temperature factor: Changes in the feed temperature of the initial distillation tower, coupled with a failure to adjust the top temperature in a timely manner, can affect the liquid level at the bottom of the tower. A high feed temperature increases the degree of vaporization of the crude oil, resulting in an increased amount of gas phase inside the tower and a lower liquid level at the bottom of the tower ； If the feed temperature is low, the degree of gasification decreases and the liquid level at the bottom of the tower rises. For example, in winter and summer, the feed temperature of crude oil may fluctuate due to differences in ambient temperature; if these fluctuations are not adjusted in a timely manner, it can affect the liquid level at the bottom of the tower. IV. Pressure and temperature factors at the tower top: The levels of pressure and temperature at the tower top can also affect changes in the liquid level at the bottom of the tower. When the temperature at the top of the tower is low and the pressure is high, it reduces the vaporization rate of the oil and gas inside the tower; the unvaporized oil flows to the bottom of the tower, causing the liquid level there to rise ； Conversely, when the top temperature is high and the pressure is low, the liquid level at the bottom of the tower decreases. For example, during operation of the unit, if there is a failure in the overhead cooling equipment, which leads to an increase in the overhead temperature and a decrease in pressure, it may result in a drop in the liquid level at the bottom of the tower. Understanding the reasons for changes in the bottom liquid level of the primary distillation tower helps operators identify problems promptly and take appropriate actions to make adjustments, ensuring the stable operation of the tower. It is hoped that everyone will pay close attention to these factors in actual operations to ensure the smooth progress of production.