Operational analysis of the reabsorption tower

1. First, analyze whether there are any fluctuations in the density of the reabsorbent in the reabsorption tower; this mainly depends on whether there are fluctuations in the distillation tower. 2. Improper operation of the absorption tower, with too low flow rates of the reabsorbent and supplementary reabsorbent. 3. Fluctuations in the pressure within the absorption tower. 4. Abnormally high temperatures at the top of the absorption tower as well as in the first and second intermediate sections, which affect the absorption efficiency (the heat exchange efficiency in these sections and the flow rate of fluid returning to the tower). 5. Variations in the flow rate of the reabsorbent, as well as issues with the instruments used for monitoring it. 6. Excessively high liquid levels in the liquid separation tank before the dry gas is sent to the desulfurization tower, leading to pressure buildup, or malfunctioning of the remote liquid level sensors. 7. Malfunctioning of the control valve used to regulate the flow of dry gas. 8. Detachment of the trays inside the reabsorption tower. That’s about it; the problems described are somewhat general – let’s see if this helps identify the issue

1. Equipment issues: In absorption towers, packed towers are commonly used to recover the unabsorbed liquefied gas or other components present in the tower. If the packing becomes clogged or there are short circuits (a rising pressure drop is a clear indication of this), the actual absorption area within the tower decreases, which can result in suboptimal absorption efficiency and lead to liquid being carried along with the dry gas； It is recommended to use maintenance opportunities to inspect the tower. 2. Process-related reasons: a) As is well known, low temperature and high pressure are conducive to absorption; it is recommended to adjust the operations based on the design specifications and the components entering the tower ； b. It is not known whether this issue has always existed or occurred recently, or if there have been any changes in the previous system – for example, if the reaction unit changed its reaction method, increasing the yield of liquefied gas and thereby causing changes in the composition of the material fed into the tower. The gas and liquid load on the tower have changed, and the original control parameters can no longer meet the current requirements for absorption and separation

Could you provide a detailed analysis of the reabsorption tower based on its structure and the quality of the lean absorbent oil?

Generally, there are no issues with the reabsorption tower; it’s just a matter of low absorption dose, temperature, and liquid level. First, verify whether the absorption and stabilization system is overloaded; if not, check the absorption dose in the absorber tower, the top temperature, and the intermediate level. And whether there is excessive parsing

This post was last edited by Green Lotus on 2018-5-1 22:38. The main focus should be on finding the cause in the absorption tower; none of the issues you mentioned are caused by the reabsorption tower

This post was last edited by Jubao Pen Yi on 2018-5-2 at 23:29. We use a floating valve tray type; the top of the reabsorption tower is equipped with a liquid dropping section and a liquid dropping foam mesh.

Analyze the impact of the feeding positions of the absorbent and the make-up absorbent in the absorption tower on the absorption efficiency What impact does the quality of the absorbent have on the absorption efficiency of the absorption tower? What is the impact of the quality of the supplementary absorbent on the absorption efficiency of the reabsorption tower? What causes the high C3-C4 content in the dry gas? What causes the high content of gasoline components above C5 in dry gas? How does it need to be adjusted?

Since your scale is relatively large, is the amount of oil absorption sufficient? The tray can be checked, right?

Two more points to add for the first floor: 1. The vicious cycle in the operation of the stripping tower and the absorption tower, with excessive stripping; 2. The foam screen in the reabsorption tower falling off

The above is the principle of absorption; therefore, it can be seen that, under constant other conditions, the quality of the absorbent directly determines the effectiveness of absorption. The greater the difference between the absorbent and the component to be absorbed, the stronger the absorption force, and the better the absorption effect! This applies to the interaction between gas and liquid; in fact, the same principle holds true for liquid-liquid interactions as well. When the concentrations of the two components are equal, the driving force for their interaction decreases!