Liquefied gas contains high sulfur content

Originally posted by WANGKAIGUANG11 on 2009-3-5 15:01 Coking liquefied gas contains high sulfur but the lean liquid cannot be discharged. What does it mean that the lean liquid cannot be discharged? I can't understand.

Does the poor liquid not coming down mean that the lean liquid cannot come down from the desulfurization tower, causing liquid accumulation? It should be caused by excessive pressure! The main reasons for the high sulfur content in liquefied gas may be the following:: 1. The quality of the desulfurization liquid is poor and the desulfurization effect is not good. 2. The raw material has high sulfur content, causing the desulfurization tower to operate at full capacity. 3. If there is a problem with the process operation, the proportion of desulfurization liquid can be appropriately increased.

When you say that the lean liquid cannot come down, do you mean that the interface position of the lean liquid in the desulfurization tower cannot be seen. In the liquefied gas desulfurization tower, the liquefied gas enters from the bottom and contacts the lean amine liquid in countercurrent. The lean amine liquid must maintain a certain interface position to remove hydrogen sulfide.； The main reasons may be the following:: Influencing factors: 1. The amount of lean liquid entering the tower is too small. 2. The amount of rich liquid leaving the tower is too large. 3. Changes in the pressure of the liquefied gas desulfurization tower 4. The amount of liquefied gas entering the tower is too large. 5. The instrument or regulating valve fails. 6. The design of the tower is unreasonable and the load is too small. 7. The sulfur content of the liquefied gas is high or too large, and the desulfurization tower is overloaded. 8. The quality or concentration of the amine liquid is unqualified, resulting in too low density.

My personal understanding: The reason why the lean liquid cannot come down is that the line speed in the tower is too high. If your device has been in operation for several years and has not been treated, especially if it has not been cleaned with water, salt will form on the filler, causing the line speed to be too high and the poor liquid cannot come down. At the same time, due to the salt formation of the filler, the gas-liquid contact area is very small and the processing capacity is reduced, so it is unqualified. Under normal circumstances, there will be no major design errors. Of course, you also need to look at the changes in your operations, whether the amount of liquefied gas is much larger, etc. Sorry for any mistakes.

I think the view on the 5th floor is correct. The reason why the poor liquid cannot come down is because the line speed in the tower is too high.: 1. The tray opening rate is small. 2. The tray is seriously clogged. 3. Large amount of liquefied gas. 4. The amount of rich liquid is small. This post was last edited by zhenghemqx on 2009-3-6 15:26 ]

Personally think: The poster did not say what the inner parts of the tray are, whether they are packed or screened. They should make it clear. 1. The quality of the lean liquid is poor and the desulfurization effect is not good. 2. The nature of the raw material has a high sulfur content, which causes the desulfurization tower to operate at full capacity. 3. It is also related to your feed temperature. We have had this happen before. The main thing is to replace ethanolamine. 4. Separate ethanolamine from the air to prevent it from oxidizing and foaming. This is the most important thing and is generally ignored by everyone. The quality of ethanolamine decreases rapidly.

1. The temperature of the lean liquid entering the tower is too low and the viscosity is high. 2. The pressure of the liquefied gas desulfurization tower is low. 3. The amount of liquefied gas entering the tower is too large. 4. The liquid level at the bottom of the tower is too high. 5. The tray is clogged. 6. The concentration of amine solution is too small. 7. The sulfur content of liquefied gas is high or too large.