Return of reprocessed oil to the tower for additional absorption
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We have a line here for returning reprocessed oil to the absorption tower, but it has never been used. I wonder if other devices have this cable? What is its purpose? When will it be put into use?
This post was last edited by liaifeng on 2009-8-25 at 11:44. I’m sure I’m not misunderstanding the process – there’s a huge difference between these two types of oil! There are also regulations stating that the number of water wash stages in the distillation tower must not exceed 16 (counted from bottom to top), with the aim of preventing heavy oil from entering the light oil system and causing quality issues. I thought of two sentences: 1. The bolder a person is, the more productive the land will be. 2. I’m not afraid that you can’t do it; I’m only afraid that you won’t think of it.
There is no line for returning reprocessed oil to the rich absorption tower; however, there is a line for returning rich absorption oil to the middle tower, which is presumably used when the amount in the middle tower is insufficient, but it has not been used before.
The reprocessed oil you mentioned comes from the irrigation area, right? It’s the contaminated oil that is reused in the distillation tower. Since the oil with high absorption is returned to the tower near diesel, the difference between the two types of oil is too great; it’s impossible to use it in refining processes to supplement diesel
Here, it comes out from the re-refining oil pump. We’ve never had any here either!
Could it be due to the operation of water interconnection?
In our plant, the crude diesel used in the delayed coking unit passes through the reabsorption tower to become enriched absorbent diesel, which then flows back through the return line – and this setup has been in use ever since； But the re-refined oil you mentioned – I’m not sure which type of oil it is, nor in what kind of equipment it’s used
We are engaged in heavy oil catalytic cracking here. Is it necessary to have a separate line for water intermodal transport?
During normal production, reprocessed oil is absolutely never used to supplement the oil for absorption, as that would inevitably contaminate the diesel. Could the original poster describe in detail the starting and ending points of this line, and whether it is connected to other lines, so that everyone can analyze it further?
Here, the heat source for the stabilizer tower is Unit 2. Before being used as a heat source at the bottom of the tower, Unit 2 diverts a stream to the line carrying the rich absorbent oil that comes out from the bottom of the reabsorption tower
The unit I’m referring to has a pipeline that carries absorbent oil and reprocessed oil; it was used during the initial operation of the unit, for water-based operations, and it was specifically designed by the design institute – it plays a significant role in those water-based operations.