Problem of water in crude oil washing the tower
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When crude oil with water flushes the tower, the tower top temperature should be appropriately ____. Answer: Improve it. Please have the experts explain this question.
The feed oil contains water, which flows into the tower; by appropriately raising the temperature at the top of the tower, the water can vaporize and be distilled out as a gas from there. This process reduces the amount of water in the tower until it is completely vaporized and distilled out from the top, thus resolving the problem
But what should be done at the same time to control the pressure in the tower?
This is a temporary solution rather than a permanent one; water should be removed as much as possible during electrodialysis to prevent it from reaching subsequent processing stages. When water is added to the tower, the pressure at the top of the tower increases accordingly as the temperature rises. It is recommended to increase the temperature after cooling and boost the return flow rate; I tried it once, but the quality could not be guaranteed
Increase the top temperature: (1) Ensure that all water vapor is distilled off at the tower top, while also keeping the path behind the tower unobstructed. If there is pressure buildup in this path, the water vapor can cause overpressure in the tower. (2) If the top temperature is too low, it will result in low temperatures in the side streams, leading to water contamination in those streams. As the reflux carries this water with it, it may also cause the pumps to lose suction; a lack of reflux flow can then lead to tower flooding. It is best to remove water as much as possible during the electrodialysis process
The best approach is to control the moisture content of the raw materials used in the device; by then, electrodesalination will prevent accidents caused by water in the crude oil entering the tower.
I think, on the one hand, it is necessary to integrate electrodialysis with the tank area to enhance dehydration – this is the fundamental solution. On the other hand, since water is already present, efforts should be made to minimize its impact on product quality and the operation of the entire tower; raising the top temperature helps prevent water from appearing in other outlet streams, and increasing the flow rate of fluid at the top can boost the partial pressure of oil and gas, thereby helping to control product quality