Solution: Answer D. Why it’s incorrect
Thread Content
1. The phenomena that can occur when water is present in the feed to the vacuum distillation tower are ( ). A. Increased drainage from the top separator tank. B. The liquid level at the bottom of the tower decreases while the feed rate to the heater remains unchanged. C. In severe cases, it may cause flooding of the vacuum distillation column. D. The feed temperature to the vacuum distillation column is high. Answer: A, B, C
It’s best not to take this issue too seriously for now; just understand the principles behind the process, and we can discuss such questions again later when the time is right. For reference.
If water is introduced, the feed temperature to the pressure reduction tower is low
If the raw material contains water and the temperature of the heating furnace remains constant, the vaporization of water absorbs a large amount of heat; consequently, the feed temperature will decrease rather than increase.
Your explanation will probably be easier for the original poster to understand! Previously, when we entered the factory, we were required to have a thorough understanding of four things and be able to do three things; therefore, it was necessary to learn all kinds of knowledge. Over time, as these concepts were integrated, many principles became clear!
These issues become clear after working in central control for one or two years. First, understand the principle of the process and its workflow, then read more books such as operation guides and technical Q&A. :handshake
The vaporization of water absorbs a large amount of heat, causing the feed temperature in the vacuum distillation tower to drop
1. The raw materials contain water, and the vaporization of water absorbs a large amount of heat; therefore, with a constant load on the heating furnace, the temperature at the outlet of the raw material heating furnace decreases. 2. When the water in crude oil vaporizes, it increases the flow rate of the crude oil within the heating furnace tubes; as a result, the residence time of the crude oil in these tubes is reduced, which also leads to a decrease in the temperature at the outlet of the heating furnace. The outlet temperature of the heating furnace determines the inlet temperature of the vacuum tower.
The raw material contains water, which must vaporize; the heat associated with this phase change is significant, leading to a drop in temperature.
When water is present, the pressure in the furnace increases, the feed temperature drops, and the liquid level at the bottom of the tower fluctuates
The raw material contains water, and the vaporization of water requires heat absorption