The liquid level in the middle section of the catalytic absorption tower cannot be lowered
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During this startup, it took 6 hours to lower the liquid level in the middle section of the absorber; two pumps designed for that section were started. There were no issues with the flow rate from these pumps, nor were there any problems with the level gauges, and crude gasoline did not enter the absorber. Please advise on how to handle this
The instrument is broken; the absorbed dose is high, causing flooding of the tower. There is too much vapor in the gas phase, which leads to overpressure in the tower. The pump cannot deliver fluid, and the pipelines are not unobstructed
“During this startup, it took 6 hours to lower the liquid level in the middle section of the absorber; two pumps designed for that section were started. There were no issues with the flow rate from these pumps, nor were there any problems with the level gauges, and crude gasoline did not enter the absorber. Please advise on how to handle this ” Why were two mid-stage pumps started, I wonder? The intermediate pump is only used for circulation and cannot lower the liquid level. At startup, excessive oil was collected in the absorption tower, resulting in flooding of the tower. It can be determined indirectly through the liquid level of the absorption tower and the liquid level of the reabsorption tower. The supplemental absorption dose can be reduced by lowering the liquid level.
I think it's also caused by the tower being submerged. . . The middle section of the absorption tower is where the heat of absorption is removed; for circulation and reflux, the presence or absence of a liquid level doesn’t make much of a difference. It is certainly good to be able to use the liquid level to guide the operation of the absorption tower. . . If the liquid level is not visible, it’s not a big problem; as long as the dry gas does not contain too many heavy components above C3 (3%–5%), which is the criterion we require. The control of process parameters is delegated to the workshop level. :lol
In the middle section of the absorption tower, when pumps are not used and there is a liquid-level overflow line in the extraction hopper, it is still fine without using pumps. However, the liquid level at the bottom of the absorption tower needs to be lowered; otherwise, the tower will be operating at full capacity and the dry gas will not be dry, as there will be no difference between the upper and lower components.
Is it possible that the volume of your supplementary absorbent used is too large? Also, how many reflux streams do you have? If there are two, are these two reflux streams shared by one pump? If both inlets of this pump are open, it’s possible for the oil from one stream to flow into the other, which will make it difficult to lower the liquid level in the second stream. Last edited by chengkang on 2009-4-27 at 12:51